kinda working

.gitignore

@@ -0,0 +1,3 @@
+out
+.env
+learn-cicd-starter

README.md

@@ -1,2 +1,3 @@
-# learn-cicd-starter
-The starter code for the "Learn CICD" course on Boot.dev
+# learn-cicd-starter (Notely)
+
+The starter code for the "Notely" application for the "Learn CICD" course on [Boot.dev](https://boot.dev).

go.mod

@@ -0,0 +1,12 @@
+module github.com/bootdotdev/learn-cicd-starter
+
+go 1.20
+
+require (
+	github.com/go-chi/chi v1.5.4
+	github.com/go-chi/cors v1.2.1
+	github.com/google/uuid v1.3.0
+	github.com/joho/godotenv v1.5.1
+)
+
+require github.com/go-sql-driver/mysql v1.7.1

go.sum

@@ -0,0 +1,10 @@
+github.com/go-chi/chi v1.5.4 h1:QHdzF2szwjqVV4wmByUnTcsbIg7UGaQ0tPF2t5GcAIs=
+github.com/go-chi/chi v1.5.4/go.mod h1:uaf8YgoFazUOkPBG7fxPftUylNumIev9awIWOENIuEg=
+github.com/go-chi/cors v1.2.1 h1:xEC8UT3Rlp2QuWNEr4Fs/c2EAGVKBwy/1vHx3bppil4=
+github.com/go-chi/cors v1.2.1/go.mod h1:sSbTewc+6wYHBBCW7ytsFSn836hqM7JxpglAy2Vzc58=
+github.com/go-sql-driver/mysql v1.7.1 h1:lUIinVbN1DY0xBg0eMOzmmtGoHwWBbvnWubQUrtU8EI=
+github.com/go-sql-driver/mysql v1.7.1/go.mod h1:OXbVy3sEdcQ2Doequ6Z5BW6fXNQTmx+9S1MCJN5yJMI=
+github.com/google/uuid v1.3.0 h1:t6JiXgmwXMjEs8VusXIJk2BXHsn+wx8BZdTaoZ5fu7I=
+github.com/google/uuid v1.3.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
+github.com/joho/godotenv v1.5.1 h1:7eLL/+HRGLY0ldzfGMeQkb7vMd0as4CfYvUVzLqw0N0=
+github.com/joho/godotenv v1.5.1/go.mod h1:f4LDr5Voq0i2e/R5DDNOoa2zzDfwtkZa6DnEwAbqwq4=

handler_notes.go

@@ -0,0 +1,115 @@
+package main
+
+import (
+	"encoding/json"
+	"net/http"
+	"time"
+
+	"github.com/bootdotdev/learn-cicd-starter/internal/database"
+	"github.com/go-chi/chi"
+	"github.com/google/uuid"
+)
+
+func (cfg *apiConfig) handlerNotesGet(w http.ResponseWriter, r *http.Request, user database.User) {
+	posts, err := cfg.DB.GetNotesForUser(r.Context(), user.ID)
+	if err != nil {
+		respondWithError(w, http.StatusInternalServerError, "Couldn't get posts for user")
+		return
+	}
+
+	respondWithJSON(w, http.StatusOK, databasePostsToPosts(posts))
+}
+
+func (cfg *apiConfig) handlerNotesUpdate(w http.ResponseWriter, r *http.Request, user database.User) {
+	type parameters struct {
+		Note string `json:"note"`
+	}
+	decoder := json.NewDecoder(r.Body)
+	params := parameters{}
+	err := decoder.Decode(&params)
+	if err != nil {
+		respondWithError(w, http.StatusInternalServerError, "Couldn't decode parameters")
+		return
+	}
+
+	noteID := chi.URLParam(r, "noteID")
+	note, err := cfg.DB.GetNote(r.Context(), noteID)
+	if err != nil {
+		respondWithError(w, http.StatusNotFound, "Couldn't get note")
+		return
+	}
+	if note.UserID != user.ID {
+		respondWithError(w, http.StatusForbidden, "Can't update another user's note")
+		return
+	}
+
+	err = cfg.DB.UpdateNote(r.Context(), database.UpdateNoteParams{
+		UpdatedAt: time.Now().UTC(),
+		Note:      params.Note,
+		ID:        noteID,
+	})
+	if err != nil {
+		respondWithError(w, http.StatusInternalServerError, "Couldn't update note")
+		return
+	}
+
+	note, err = cfg.DB.GetNote(r.Context(), noteID)
+	if err != nil {
+		respondWithError(w, http.StatusNotFound, "Couldn't get note")
+		return
+	}
+	respondWithJSON(w, http.StatusOK, databaseNoteToNote(note))
+}
+
+func (cfg *apiConfig) handlerNotesDelete(w http.ResponseWriter, r *http.Request, user database.User) {
+	noteID := chi.URLParam(r, "noteID")
+	note, err := cfg.DB.GetNote(r.Context(), noteID)
+	if err != nil {
+		respondWithError(w, http.StatusNotFound, "Couldn't get note")
+		return
+	}
+	if note.UserID != user.ID {
+		respondWithError(w, http.StatusForbidden, "Can't update another user's note")
+		return
+	}
+
+	err = cfg.DB.DeleteNote(r.Context(), noteID)
+	if err != nil {
+		respondWithError(w, http.StatusInternalServerError, "Couldn't delete note")
+		return
+	}
+	respondWithJSON(w, http.StatusOK, struct{}{})
+}
+
+func (cfg *apiConfig) handlerNotesCreate(w http.ResponseWriter, r *http.Request, user database.User) {
+	type parameters struct {
+		Note string `json:"note"`
+	}
+	decoder := json.NewDecoder(r.Body)
+	params := parameters{}
+	err := decoder.Decode(&params)
+	if err != nil {
+		respondWithError(w, http.StatusInternalServerError, "Couldn't decode parameters")
+		return
+	}
+
+	id := uuid.New().String()
+	err = cfg.DB.CreateNote(r.Context(), database.CreateNoteParams{
+		ID:        id,
+		CreatedAt: time.Now().UTC(),
+		UpdatedAt: time.Now().UTC(),
+		Note:      params.Note,
+		UserID:    user.ID,
+	})
+	if err != nil {
+		respondWithError(w, http.StatusInternalServerError, "Couldn't create note")
+		return
+	}
+
+	note, err := cfg.DB.GetNote(r.Context(), id)
+	if err != nil {
+		respondWithError(w, http.StatusNotFound, "Couldn't get note")
+		return
+	}
+	respondWithJSON(w, http.StatusOK, databaseNoteToNote(note))
+}

handler_ready.go

@@ -0,0 +1,7 @@
+package main
+
+import "net/http"
+
+func handlerReadiness(w http.ResponseWriter, r *http.Request) {
+	respondWithJSON(w, http.StatusOK, map[string]string{"status": "ok"})
+}

handler_user.go

@@ -0,0 +1,70 @@
+package main
+
+import (
+	"crypto/rand"
+	"crypto/sha256"
+	"encoding/hex"
+	"encoding/json"
+	"log"
+	"net/http"
+	"time"
+
+	"github.com/bootdotdev/learn-cicd-starter/internal/database"
+	"github.com/google/uuid"
+)
+
+func (cfg *apiConfig) handlerUsersCreate(w http.ResponseWriter, r *http.Request) {
+	type parameters struct {
+		Name string `json:"name"`
+	}
+	decoder := json.NewDecoder(r.Body)
+	params := parameters{}
+	err := decoder.Decode(&params)
+	if err != nil {
+		respondWithError(w, http.StatusInternalServerError, "Couldn't decode parameters")
+		return
+	}
+
+	apiKey, err := generateRandomSHA256Hash()
+	if err != nil {
+		respondWithError(w, http.StatusInternalServerError, "Couldn't gen apikey")
+		return
+	}
+
+	err = cfg.DB.CreateUser(r.Context(), database.CreateUserParams{
+		ID:        uuid.New().String(),
+		CreatedAt: time.Now().UTC(),
+		UpdatedAt: time.Now().UTC(),
+		Name:      params.Name,
+		ApiKey:    apiKey,
+	})
+	if err != nil {
+		log.Println(err)
+		respondWithError(w, http.StatusInternalServerError, "Couldn't create user")
+		return
+	}
+
+	user, err := cfg.DB.GetUserByAPIKey(r.Context(), apiKey)
+	if err != nil {
+		log.Println(err)
+		respondWithError(w, http.StatusInternalServerError, "Couldn't get user")
+		return
+	}
+
+	respondWithJSON(w, http.StatusOK, databaseUserToUser(user))
+}
+
+func generateRandomSHA256Hash() (string, error) {
+	randomBytes := make([]byte, 32)
+	_, err := rand.Read(randomBytes)
+	if err != nil {
+		return "", err
+	}
+	hash := sha256.Sum256(randomBytes)
+	hashString := hex.EncodeToString(hash[:])
+	return hashString, nil
+}
+
+func (cfg *apiConfig) handlerUsersGet(w http.ResponseWriter, r *http.Request, user database.User) {
+	respondWithJSON(w, http.StatusOK, databaseUserToUser(user))
+}

internal/auth/auth.go

@@ -0,0 +1,23 @@
+package auth
+
+import (
+	"errors"
+	"net/http"
+	"strings"
+)
+
+var ErrNoAuthHeaderIncluded = errors.New("no authorization header included")
+
+// GetAPIKey -
+func GetAPIKey(headers http.Header) (string, error) {
+	authHeader := headers.Get("Authorization")
+	if authHeader == "" {
+		return "", ErrNoAuthHeaderIncluded
+	}
+	splitAuth := strings.Split(authHeader, " ")
+	if len(splitAuth) < 2 || splitAuth[0] != "ApiKey" {
+		return "", errors.New("malformed authorization header")
+	}
+
+	return splitAuth[1], nil
+}

internal/database/db.go

@@ -0,0 +1,31 @@
+// Code generated by sqlc. DO NOT EDIT.
+// versions:
+//   sqlc v1.18.0
+
+package database
+
+import (
+	"context"
+	"database/sql"
+)
+
+type DBTX interface {
+	ExecContext(context.Context, string, ...interface{}) (sql.Result, error)
+	PrepareContext(context.Context, string) (*sql.Stmt, error)
+	QueryContext(context.Context, string, ...interface{}) (*sql.Rows, error)
+	QueryRowContext(context.Context, string, ...interface{}) *sql.Row
+}
+
+func New(db DBTX) *Queries {
+	return &Queries{db: db}
+}
+
+type Queries struct {
+	db DBTX
+}
+
+func (q *Queries) WithTx(tx *sql.Tx) *Queries {
+	return &Queries{
+		db: tx,
+	}
+}

internal/database/models.go

@@ -0,0 +1,25 @@
+// Code generated by sqlc. DO NOT EDIT.
+// versions:
+//   sqlc v1.18.0
+
+package database
+
+import (
+	"time"
+)
+
+type Note struct {
+	ID        string
+	CreatedAt time.Time
+	UpdatedAt time.Time
+	Note      string
+	UserID    string
+}
+
+type User struct {
+	ID        string
+	CreatedAt time.Time
+	UpdatedAt time.Time
+	Name      string
+	ApiKey    string
+}

internal/database/notes.sql.go

@@ -0,0 +1,113 @@
+// Code generated by sqlc. DO NOT EDIT.
+// versions:
+//   sqlc v1.18.0
+// source: notes.sql
+
+package database
+
+import (
+	"context"
+	"time"
+)
+
+const createNote = `-- name: CreateNote :exec
+INSERT INTO notes (id, created_at, updated_at, note, user_id)
+VALUES (?, ?, ?, ?, ?)
+`
+
+type CreateNoteParams struct {
+	ID        string
+	CreatedAt time.Time
+	UpdatedAt time.Time
+	Note      string
+	UserID    string
+}
+
+func (q *Queries) CreateNote(ctx context.Context, arg CreateNoteParams) error {
+	_, err := q.db.ExecContext(ctx, createNote,
+		arg.ID,
+		arg.CreatedAt,
+		arg.UpdatedAt,
+		arg.Note,
+		arg.UserID,
+	)
+	return err
+}
+
+const deleteNote = `-- name: DeleteNote :exec
+
+DELETE FROM notes WHERE id = ?
+`
+
+func (q *Queries) DeleteNote(ctx context.Context, id string) error {
+	_, err := q.db.ExecContext(ctx, deleteNote, id)
+	return err
+}
+
+const getNote = `-- name: GetNote :one
+
+SELECT id, created_at, updated_at, note, user_id FROM notes WHERE id = ?
+`
+
+func (q *Queries) GetNote(ctx context.Context, id string) (Note, error) {
+	row := q.db.QueryRowContext(ctx, getNote, id)
+	var i Note
+	err := row.Scan(
+		&i.ID,
+		&i.CreatedAt,
+		&i.UpdatedAt,
+		&i.Note,
+		&i.UserID,
+	)
+	return i, err
+}
+
+const getNotesForUser = `-- name: GetNotesForUser :many
+
+SELECT id, created_at, updated_at, note, user_id FROM notes WHERE user_id = ?
+`
+
+func (q *Queries) GetNotesForUser(ctx context.Context, userID string) ([]Note, error) {
+	rows, err := q.db.QueryContext(ctx, getNotesForUser, userID)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+	var items []Note
+	for rows.Next() {
+		var i Note
+		if err := rows.Scan(
+			&i.ID,
+			&i.CreatedAt,
+			&i.UpdatedAt,
+			&i.Note,
+			&i.UserID,
+		); err != nil {
+			return nil, err
+		}
+		items = append(items, i)
+	}
+	if err := rows.Close(); err != nil {
+		return nil, err
+	}
+	if err := rows.Err(); err != nil {
+		return nil, err
+	}
+	return items, nil
+}
+
+const updateNote = `-- name: UpdateNote :exec
+
+UPDATE notes SET updated_at = ?, note = ? WHERE id = ?
+`
+
+type UpdateNoteParams struct {
+	UpdatedAt time.Time
+	Note      string
+	ID        string
+}
+
+func (q *Queries) UpdateNote(ctx context.Context, arg UpdateNoteParams) error {
+	_, err := q.db.ExecContext(ctx, updateNote, arg.UpdatedAt, arg.Note, arg.ID)
+	return err
+}

internal/database/users.sql.go

@@ -0,0 +1,59 @@
+// Code generated by sqlc. DO NOT EDIT.
+// versions:
+//   sqlc v1.18.0
+// source: users.sql
+
+package database
+
+import (
+	"context"
+	"time"
+)
+
+const createUser = `-- name: CreateUser :exec
+INSERT INTO users (id, created_at, updated_at, name, api_key)
+VALUES (
+    ?,
+    ?,
+    ?,
+    ?,
+    ?
+)
+`
+
+type CreateUserParams struct {
+	ID        string
+	CreatedAt time.Time
+	UpdatedAt time.Time
+	Name      string
+	ApiKey    string
+}
+
+func (q *Queries) CreateUser(ctx context.Context, arg CreateUserParams) error {
+	_, err := q.db.ExecContext(ctx, createUser,
+		arg.ID,
+		arg.CreatedAt,
+		arg.UpdatedAt,
+		arg.Name,
+		arg.ApiKey,
+	)
+	return err
+}
+
+const getUserByAPIKey = `-- name: GetUserByAPIKey :one
+
+SELECT id, created_at, updated_at, name, api_key FROM users WHERE api_key = ?
+`
+
+func (q *Queries) GetUserByAPIKey(ctx context.Context, apiKey string) (User, error) {
+	row := q.db.QueryRowContext(ctx, getUserByAPIKey, apiKey)
+	var i User
+	err := row.Scan(
+		&i.ID,
+		&i.CreatedAt,
+		&i.UpdatedAt,
+		&i.Name,
+		&i.ApiKey,
+	)
+	return i, err
+}

json.go

@@ -0,0 +1,31 @@
+package main
+
+import (
+	"encoding/json"
+	"log"
+	"net/http"
+)
+
+func respondWithError(w http.ResponseWriter, code int, msg string) {
+	if code > 499 {
+		log.Printf("Responding with 5XX error: %s", msg)
+	}
+	type errorResponse struct {
+		Error string `json:"error"`
+	}
+	respondWithJSON(w, code, errorResponse{
+		Error: msg,
+	})
+}
+
+func respondWithJSON(w http.ResponseWriter, code int, payload interface{}) {
+	w.Header().Set("Content-Type", "application/json")
+	dat, err := json.Marshal(payload)
+	if err != nil {
+		log.Printf("Error marshalling JSON: %s", err)
+		w.WriteHeader(500)
+		return
+	}
+	w.WriteHeader(code)
+	w.Write(dat)
+}

main.go

@@ -0,0 +1,123 @@
+package main
+
+import (
+	"database/sql"
+	"embed"
+	"io"
+	"log"
+	"net/http"
+	"net/url"
+	"os"
+	"strings"
+
+	"github.com/go-chi/chi"
+	"github.com/go-chi/cors"
+	"github.com/joho/godotenv"
+
+	"github.com/bootdotdev/learn-cicd-starter/internal/database"
+
+	_ "embed"
+
+	_ "github.com/go-sql-driver/mysql"
+)
+
+type apiConfig struct {
+	DB *database.Queries
+}
+
+//go:embed static/*
+var staticFiles embed.FS
+
+func main() {
+	godotenv.Load(".env")
+
+	port := os.Getenv("PORT")
+	if port == "" {
+		log.Fatal("PORT environment variable is not set")
+	}
+
+	apiCfg := apiConfig{}
+
+	dbURL := os.Getenv("DATABASE_URL")
+	if dbURL == "" {
+		log.Println("DATABASE_URL environment variable is not set")
+		log.Println("Running without CRUD endpoints")
+	} else {
+		parsedURL, err := addParseTimeParam(dbURL)
+		if err != nil {
+			log.Fatal(err)
+		}
+		db, err := sql.Open("mysql", parsedURL)
+		if err != nil {
+			log.Fatal(err)
+		}
+		dbQueries := database.New(db)
+		apiCfg.DB = dbQueries
+	}
+
+	router := chi.NewRouter()
+
+	router.Use(cors.Handler(cors.Options{
+		AllowedOrigins:   []string{"https://*", "http://*"},
+		AllowedMethods:   []string{"GET", "POST", "PUT", "DELETE", "OPTIONS"},
+		AllowedHeaders:   []string{"*"},
+		ExposedHeaders:   []string{"Link"},
+		AllowCredentials: false,
+		MaxAge:           300,
+	}))
+
+	router.Get("/", func(w http.ResponseWriter, r *http.Request) {
+		f, err := staticFiles.Open("static/index.html")
+		if err != nil {
+			http.Error(w, err.Error(), http.StatusInternalServerError)
+			return
+		}
+		defer f.Close()
+		if _, err := io.Copy(w, f); err != nil {
+			http.Error(w, err.Error(), http.StatusInternalServerError)
+		}
+	})
+
+	v1Router := chi.NewRouter()
+
+	if apiCfg.DB != nil {
+		v1Router.Post("/users", apiCfg.handlerUsersCreate)
+		v1Router.Get("/users", apiCfg.middlewareAuth(apiCfg.handlerUsersGet))
+		v1Router.Get("/notes", apiCfg.middlewareAuth(apiCfg.handlerNotesGet))
+		v1Router.Post("/notes", apiCfg.middlewareAuth(apiCfg.handlerNotesCreate))
+		v1Router.Delete("/notes/{noteID}", apiCfg.middlewareAuth(apiCfg.handlerNotesDelete))
+		v1Router.Put("/notes/{noteID}", apiCfg.middlewareAuth(apiCfg.handlerNotesUpdate))
+	}
+
+	v1Router.Get("/healthz", handlerReadiness)
+
+	router.Mount("/v1", v1Router)
+	srv := &http.Server{
+		Addr:    ":" + port,
+		Handler: router,
+	}
+
+	log.Printf("Serving on port: %s\n", port)
+	log.Fatal(srv.ListenAndServe())
+}
+
+func addParseTimeParam(input string) (string, error) {
+	const dummyScheme = "http://"
+	if !strings.Contains(input, dummyScheme) {
+		input = "http://" + input
+	}
+
+	u, err := url.Parse(input)
+	if err != nil {
+		return "", err
+	}
+
+	q := u.Query()
+	q.Add("parseTime", "true")
+	u.RawQuery = q.Encode()
+
+	// Remove the added http:// if it's not in the original input
+	returnUrl := u.String()
+	returnUrl = strings.TrimPrefix(returnUrl, dummyScheme)
+	return returnUrl, nil
+}

middleware_auth.go

@@ -0,0 +1,28 @@
+package main
+
+import (
+	"net/http"
+
+	"github.com/bootdotdev/learn-cicd-starter/internal/auth"
+	"github.com/bootdotdev/learn-cicd-starter/internal/database"
+)
+
+type authedHandler func(http.ResponseWriter, *http.Request, database.User)
+
+func (cfg *apiConfig) middlewareAuth(handler authedHandler) http.HandlerFunc {
+	return func(w http.ResponseWriter, r *http.Request) {
+		apiKey, err := auth.GetAPIKey(r.Header)
+		if err != nil {
+			respondWithError(w, http.StatusUnauthorized, "Couldn't find api key")
+			return
+		}
+
+		user, err := cfg.DB.GetUserByAPIKey(r.Context(), apiKey)
+		if err != nil {
+			respondWithError(w, http.StatusNotFound, "Couldn't get user")
+			return
+		}
+
+		handler(w, r, user)
+	}
+}

models.go

@@ -0,0 +1,51 @@
+package main
+
+import (
+	"time"
+
+	"github.com/bootdotdev/learn-cicd-starter/internal/database"
+)
+
+type User struct {
+	ID        string    `json:"id"`
+	CreatedAt time.Time `json:"created_at"`
+	UpdatedAt time.Time `json:"updated_at"`
+	Name      string    `json:"name"`
+	ApiKey    string    `json:"api_key"`
+}
+
+func databaseUserToUser(user database.User) User {
+	return User{
+		ID:        user.ID,
+		CreatedAt: user.CreatedAt,
+		UpdatedAt: user.UpdatedAt,
+		Name:      user.Name,
+		ApiKey:    user.ApiKey,
+	}
+}
+
+type Note struct {
+	ID        string    `json:"id"`
+	CreatedAt time.Time `json:"created_at"`
+	UpdatedAt time.Time `json:"updated_at"`
+	Note      string    `json:"note"`
+	UserID    string    `json:"user_id"`
+}
+
+func databaseNoteToNote(post database.Note) Note {
+	return Note{
+		ID:        post.ID,
+		CreatedAt: post.CreatedAt,
+		UpdatedAt: post.UpdatedAt,
+		Note:      post.Note,
+		UserID:    post.UserID,
+	}
+}
+
+func databasePostsToPosts(notes []database.Note) []Note {
+	result := make([]Note, len(notes))
+	for i, note := range notes {
+		result[i] = databaseNoteToNote(note)
+	}
+	return result
+}

scripts/migrateup.sh

@@ -0,0 +1,4 @@
+source .env
+
+cd sql/schema
+goose mysql $DATABASE_URL up

sql/queries/notes.sql

@@ -0,0 +1,20 @@
+-- name: CreateNote :exec
+INSERT INTO notes (id, created_at, updated_at, note, user_id)
+VALUES (?, ?, ?, ?, ?);
+--
+
+-- name: GetNote :one
+SELECT * FROM notes WHERE id = ?;
+--
+
+-- name: GetNotesForUser :many
+SELECT * FROM notes WHERE user_id = ?;
+--
+
+-- name: UpdateNote :exec
+UPDATE notes SET updated_at = ?, note = ? WHERE id = ?;
+--
+
+-- name: DeleteNote :exec
+DELETE FROM notes WHERE id = ?;
+--

sql/queries/users.sql

@@ -0,0 +1,14 @@
+-- name: CreateUser :exec
+INSERT INTO users (id, created_at, updated_at, name, api_key)
+VALUES (
+    ?,
+    ?,
+    ?,
+    ?,
+    ?
+);
+--
+
+-- name: GetUserByAPIKey :one
+SELECT * FROM users WHERE api_key = ?;
+--

sql/schema/001_users.sql

@@ -0,0 +1,11 @@
+-- +goose Up
+CREATE TABLE users (
+    id VARCHAR(36) PRIMARY KEY,
+    created_at TIMESTAMP NOT NULL,
+    updated_at TIMESTAMP NOT NULL,
+    name TEXT NOT NULL,
+    api_key VARCHAR(64) UNIQUE NOT NULL
+);
+
+-- +goose Down
+DROP TABLE users;

sql/schema/002_notes.sql

@@ -0,0 +1,11 @@
+-- +goose Up
+CREATE TABLE notes (
+    id VARCHAR(36) PRIMARY KEY,
+    created_at TIMESTAMP NOT NULL,
+    updated_at TIMESTAMP NOT NULL,
+    note TEXT NOT NULL,
+    user_id VARCHAR(36) NOT NULL REFERENCES users(id) ON DELETE CASCADE
+);
+
+-- +goose Down
+DROP TABLE notes;

sqlc.yaml

@@ -0,0 +1,8 @@
+version: "2"
+sql:
+  - schema: "sql/schema"
+    queries: "sql/queries"
+    engine: "mysql"
+    gen:
+      go:
+        out: "internal/database"

static/index.html

@@ -0,0 +1,156 @@
+<!DOCTYPE html>
+<html lang="en">
+
+<head>
+    <meta charset="UTF-8">
+    <title>Notely</title>
+</head>
+
+<body>
+    <h1>Notely</h1>
+    <button id="createUserButton">Create User</button>
+
+    <h2>Create Note</h2>
+    <textarea id="newNoteContent"></textarea>
+    <button id="createNoteButton">Create Note</button>
+
+    <h2>Your Notes</h2>
+    <div id="notes"></div>
+
+    <script>
+        const API_BASE = '/v1';
+        let currentUserAPIKey = localStorage.getItem('currentUserAPIKey')
+        let currentUser = null;
+
+        document.getElementById('createUserButton').addEventListener('click', createUser);
+        document.getElementById('createNoteButton').addEventListener('click', createNote);
+
+        async function createUser() {
+            const response = await fetch(`${API_BASE}/users`, {
+                method: 'POST',
+                headers: { 'Content-Type': 'application/json' },
+                body: JSON.stringify({ name: 'Test User' })
+            });
+            const user = await response.json();
+            localStorage.setItem('currentUserAPIKey', user.api_key);
+            currentUserAPIKey = user.api_key;
+            currentUser = user;
+            alert(`User Created: ${user.name}`);
+        }
+
+        async function createNote() {
+            if (!currentUser) {
+                alert('Please create a user first');
+                return;
+            }
+            const noteContent = document.getElementById('newNoteContent').value;
+            const response = await fetch(`${API_BASE}/notes`,
+                {
+                    method: 'POST', headers: { 'Content-Type': 'application/json', 'Authorization': `ApiKey ${currentUserAPIKey}` },
+                    body: JSON.stringify({ note: noteContent })
+                });
+            const note = await response.json();
+            displayNote(note);
+
+        }
+
+        async function getUser() {
+            const response = await fetch(`${API_BASE}/users`, { headers: { 'Authorization': `ApiKey ${currentUserAPIKey}` } });
+            return await response.json();
+        }
+
+        function logout() {
+            localStorage.removeItem('currentUserAPIKey');
+            currentUser = null;
+        }
+
+        async function loadNotes() {
+            if (!currentUser) {
+                return;
+            }
+            const response = await fetch(`${API_BASE}/notes`, { headers: { 'Authorization': `ApiKey ${currentUserAPIKey}` } });
+            const notes = await response.json();
+            const notesContainer = document.getElementById('notes');
+            notesContainer.innerHTML = '';
+            notes.forEach(note => displayNote(note));
+        }
+
+        function displayNote(note) {
+            const noteElement = document.createElement('div');
+            noteElement.className = 'note';
+            noteElement.textContent = note.note;
+            document.getElementById('notes').appendChild(noteElement);
+        }
+
+        async function login() {
+            if (!currentUserAPIKey) {
+                return
+            }
+            const user = await getUser();
+            currentUser = user;
+            currentUserAPIKey = user.api_key;
+            await loadNotes();
+        }
+
+        login();
+    </script>
+
+    <style>
+        :root {
+            --primary: hsl(235, 86%, 65%);
+            --primary-light: hsl(235, 88%, 73%);
+            --dark: #121212;
+            --light: #E4E4E4;
+            --grey: #424242;
+        }
+
+        body {
+            font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
+            background-color: var(--dark);
+            color: var(--light);
+            margin: 0;
+            padding: 0;
+            display: flex;
+            flex-direction: column;
+            align-items: center;
+            height: 100vh;
+            justify-content: center;
+        }
+
+
+
+        textarea {
+            width: 300px;
+            height: 100px;
+            margin-bottom: 10px;
+        }
+
+        button {
+            background-color: var(--primary);
+            color: var(--light);
+            border: none;
+            padding: 15px 32px;
+            text-align: center;
+            text-decoration: none;
+            display: inline-block;
+            font-size: 16px;
+            margin: 4px 2px;
+            cursor: pointer;
+            transition-duration: 0.4s;
+        }
+
+        button:hover {
+            background-color: var(--primary-light);
+        }
+
+        .note {
+            width: 300px;
+            background-color: var(--grey);
+            border: 1px solid var(--primary);
+            padding: 10px;
+            margin-bottom: 10px;
+        }
+    </style>
+</body>
+
+</html>

vendor/github.com/go-chi/chi/.gitignore

@@ -0,0 +1,3 @@
+.idea
+*.sw?
+.vscode

vendor/github.com/go-chi/chi/CHANGELOG.md

@@ -0,0 +1,269 @@
+# Changelog
+
+## v1.5.4 (2021-02-27)
+
+- Undo prior retraction in v1.5.3 as we prepare for v5.0.0 release
+- History of changes: see https://github.com/go-chi/chi/compare/v1.5.3...v1.5.4
+
+
+## v1.5.3 (2021-02-21)
+
+- Update go.mod to go 1.16 with new retract directive marking all versions without prior go.mod support
+- History of changes: see https://github.com/go-chi/chi/compare/v1.5.2...v1.5.3
+
+
+## v1.5.2 (2021-02-10)
+
+- Reverting allocation optimization as a precaution as go test -race fails.
+- Minor improvements, see history below
+- History of changes: see https://github.com/go-chi/chi/compare/v1.5.1...v1.5.2
+
+
+## v1.5.1 (2020-12-06)
+
+- Performance improvement: removing 1 allocation by foregoing context.WithValue, thank you @bouk for
+  your contribution (https://github.com/go-chi/chi/pull/555). Note: new benchmarks posted in README.
+- `middleware.CleanPath`: new middleware that clean's request path of double slashes
+- deprecate & remove `chi.ServerBaseContext` in favour of stdlib `http.Server#BaseContext`
+- plus other tiny improvements, see full commit history below
+- History of changes: see https://github.com/go-chi/chi/compare/v4.1.2...v1.5.1
+
+
+## v1.5.0 (2020-11-12) - now with go.mod support
+
+`chi` dates back to 2016 with it's original implementation as one of the first routers to adopt the newly introduced
+context.Context api to the stdlib -- set out to design a router that is faster, more modular and simpler than anything
+else out there -- while not introducing any custom handler types or dependencies. Today, `chi` still has zero dependencies,
+and in many ways is future proofed from changes, given it's minimal nature. Between versions, chi's iterations have been very
+incremental, with the architecture and api being the same today as it was originally designed in 2016. For this reason it 
+makes chi a pretty easy project to maintain, as well thanks to the many amazing community contributions over the years
+to who all help make chi better (total of 86 contributors to date -- thanks all!).
+
+Chi has been an labour of love, art and engineering, with the goals to offer beautiful ergonomics, flexibility, performance
+and simplicity when building HTTP services with Go. I've strived to keep the router very minimal in surface area / code size,
+and always improving the code wherever possible -- and as of today the `chi` package is just 1082 lines of code (not counting
+middlewares, which are all optional). As well, I don't have the exact metrics, but from my analysis and email exchanges from
+companies and developers, chi is used by thousands of projects around the world -- thank you all as there is no better form of
+joy for me than to have art I had started be helpful and enjoyed by others. And of course I use chi in all of my own projects too :)
+
+For me, the asthetics of chi's code and usage are very important. With the introduction of Go's module support 
+(which I'm a big fan of), chi's past versioning scheme choice to v2, v3 and v4 would mean I'd require the import path
+of "github.com/go-chi/chi/v4", leading to the lengthy discussion at https://github.com/go-chi/chi/issues/462.
+Haha, to some, you may be scratching your head why I've spent > 1 year stalling to adopt "/vXX" convention in the import
+path -- which isn't horrible in general -- but for chi, I'm unable to accept it as I strive for perfection in it's API design,
+aesthetics and simplicity. It just doesn't feel good to me given chi's simple nature -- I do not foresee a "v5" or "v6",
+and upgrading between versions in the future will also be just incremental.
+
+I do understand versioning is a part of the API design as well, which is why the solution for a while has been to "do nothing",
+as Go supports both old and new import paths with/out go.mod. However, now that Go module support has had time to iron out kinks and
+is adopted everywhere, it's time for chi to get with the times. Luckily, I've discovered a path forward that will make me happy,
+while also not breaking anyone's app who adopted a prior versioning from tags in v2/v3/v4. I've made an experimental release of
+v1.5.0 with go.mod silently, and tested it with new and old projects, to ensure the developer experience is preserved, and it's
+largely unnoticed. Fortunately, Go's toolchain will check the tags of a repo and consider the "latest" tag the one with go.mod.
+However, you can still request a specific older tag such as v4.1.2, and everything will "just work". But new users can just
+`go get github.com/go-chi/chi` or `go get github.com/go-chi/chi@latest` and they will get the latest version which contains
+go.mod support, which is v1.5.0+. `chi` will not change very much over the years, just like it hasn't changed much from 4 years ago.
+Therefore, we will stay on v1.x from here on, starting from v1.5.0. Any breaking changes will bump a "minor" release and
+backwards-compatible improvements/fixes will bump a "tiny" release.
+
+For existing projects who want to upgrade to the latest go.mod version, run: `go get -u github.com/go-chi/chi@v1.5.0`,
+which will get you on the go.mod version line (as Go's mod cache may still remember v4.x). Brand new systems can run
+`go get -u github.com/go-chi/chi` or `go get -u github.com/go-chi/chi@latest` to install chi, which will install v1.5.0+
+built with go.mod support.
+
+My apologies to the developers who will disagree with the decisions above, but, hope you'll try it and see it's a very
+minor request which is backwards compatible and won't break your existing installations.
+
+Cheers all, happy coding!
+
+
+---
+
+
+## v4.1.2 (2020-06-02)
+
+- fix that handles MethodNotAllowed with path variables, thank you @caseyhadden for your contribution
+- fix to replace nested wildcards correctly in RoutePattern, thank you @@unmultimedio for your contribution
+- History of changes: see https://github.com/go-chi/chi/compare/v4.1.1...v4.1.2
+
+
+## v4.1.1 (2020-04-16)
+
+- fix for issue https://github.com/go-chi/chi/issues/411 which allows for overlapping regexp
+  route to the correct handler through a recursive tree search, thanks to @Jahaja for the PR/fix!
+- new middleware.RouteHeaders as a simple router for request headers with wildcard support
+- History of changes: see https://github.com/go-chi/chi/compare/v4.1.0...v4.1.1
+
+
+## v4.1.0 (2020-04-1)
+
+- middleware.LogEntry: Write method on interface now passes the response header
+  and an extra interface type useful for custom logger implementations.
+- middleware.WrapResponseWriter: minor fix
+- middleware.Recoverer: a bit prettier
+- History of changes: see https://github.com/go-chi/chi/compare/v4.0.4...v4.1.0
+
+## v4.0.4 (2020-03-24)
+
+- middleware.Recoverer: new pretty stack trace printing (https://github.com/go-chi/chi/pull/496)
+- a few minor improvements and fixes
+- History of changes: see https://github.com/go-chi/chi/compare/v4.0.3...v4.0.4
+
+
+## v4.0.3 (2020-01-09)
+
+- core: fix regexp routing to include default value when param is not matched
+- middleware: rewrite of middleware.Compress
+- middleware: suppress http.ErrAbortHandler in middleware.Recoverer
+- History of changes: see https://github.com/go-chi/chi/compare/v4.0.2...v4.0.3
+
+
+## v4.0.2 (2019-02-26)
+
+- Minor fixes
+- History of changes: see https://github.com/go-chi/chi/compare/v4.0.1...v4.0.2
+
+
+## v4.0.1 (2019-01-21)
+
+- Fixes issue with compress middleware: #382 #385
+- History of changes: see https://github.com/go-chi/chi/compare/v4.0.0...v4.0.1
+
+
+## v4.0.0 (2019-01-10)
+
+- chi v4 requires Go 1.10.3+ (or Go 1.9.7+) - we have deprecated support for Go 1.7 and 1.8
+- router: respond with 404 on router with no routes (#362)
+- router: additional check to ensure wildcard is at the end of a url pattern (#333)
+- middleware: deprecate use of http.CloseNotifier (#347)
+- middleware: fix RedirectSlashes to include query params on redirect (#334)
+- History of changes: see https://github.com/go-chi/chi/compare/v3.3.4...v4.0.0
+
+
+## v3.3.4 (2019-01-07)
+
+- Minor middleware improvements. No changes to core library/router. Moving v3 into its
+- own branch as a version of chi for Go 1.7, 1.8, 1.9, 1.10, 1.11
+- History of changes: see https://github.com/go-chi/chi/compare/v3.3.3...v3.3.4
+
+
+## v3.3.3 (2018-08-27)
+
+- Minor release
+- See https://github.com/go-chi/chi/compare/v3.3.2...v3.3.3
+
+
+## v3.3.2 (2017-12-22)
+
+- Support to route trailing slashes on mounted sub-routers (#281)
+- middleware: new `ContentCharset` to check matching charsets. Thank you
+  @csucu for your community contribution!
+
+
+## v3.3.1 (2017-11-20)
+
+- middleware: new `AllowContentType` handler for explicit whitelist of accepted request Content-Types
+- middleware: new `SetHeader` handler for short-hand middleware to set a response header key/value
+- Minor bug fixes
+
+
+## v3.3.0 (2017-10-10)
+
+- New chi.RegisterMethod(method) to add support for custom HTTP methods, see _examples/custom-method for usage
+- Deprecated LINK and UNLINK methods from the default list, please use `chi.RegisterMethod("LINK")` and `chi.RegisterMethod("UNLINK")` in an `init()` function
+
+
+## v3.2.1 (2017-08-31)
+
+- Add new `Match(rctx *Context, method, path string) bool` method to `Routes` interface
+  and `Mux`. Match searches the mux's routing tree for a handler that matches the method/path
+- Add new `RouteMethod` to `*Context`
+- Add new `Routes` pointer to `*Context`
+- Add new `middleware.GetHead` to route missing HEAD requests to GET handler
+- Updated benchmarks (see README)
+
+
+## v3.1.5 (2017-08-02)
+
+- Setup golint and go vet for the project
+- As per golint, we've redefined `func ServerBaseContext(h http.Handler, baseCtx context.Context) http.Handler`
+  to `func ServerBaseContext(baseCtx context.Context, h http.Handler) http.Handler`
+
+
+## v3.1.0 (2017-07-10)
+
+- Fix a few minor issues after v3 release
+- Move `docgen` sub-pkg to https://github.com/go-chi/docgen
+- Move `render` sub-pkg to https://github.com/go-chi/render
+- Add new `URLFormat` handler to chi/middleware sub-pkg to make working with url mime 
+  suffixes easier, ie. parsing `/articles/1.json` and `/articles/1.xml`. See comments in
+  https://github.com/go-chi/chi/blob/master/middleware/url_format.go for example usage.
+
+
+## v3.0.0 (2017-06-21)
+
+- Major update to chi library with many exciting updates, but also some *breaking changes*
+- URL parameter syntax changed from `/:id` to `/{id}` for even more flexible routing, such as
+  `/articles/{month}-{day}-{year}-{slug}`, `/articles/{id}`, and `/articles/{id}.{ext}` on the
+  same router
+- Support for regexp for routing patterns, in the form of `/{paramKey:regExp}` for example:
+  `r.Get("/articles/{name:[a-z]+}", h)` and `chi.URLParam(r, "name")`
+- Add `Method` and `MethodFunc` to `chi.Router` to allow routing definitions such as
+  `r.Method("GET", "/", h)` which provides a cleaner interface for custom handlers like
+  in `_examples/custom-handler`
+- Deprecating `mux#FileServer` helper function. Instead, we encourage users to create their
+  own using file handler with the stdlib, see `_examples/fileserver` for an example
+- Add support for LINK/UNLINK http methods via `r.Method()` and `r.MethodFunc()`
+- Moved the chi project to its own organization, to allow chi-related community packages to
+  be easily discovered and supported, at: https://github.com/go-chi
+- *NOTE:* please update your import paths to `"github.com/go-chi/chi"`
+- *NOTE:* chi v2 is still available at https://github.com/go-chi/chi/tree/v2
+
+
+## v2.1.0 (2017-03-30)
+
+- Minor improvements and update to the chi core library
+- Introduced a brand new `chi/render` sub-package to complete the story of building
+  APIs to offer a pattern for managing well-defined request / response payloads. Please
+  check out the updated `_examples/rest` example for how it works.
+- Added `MethodNotAllowed(h http.HandlerFunc)` to chi.Router interface
+
+
+## v2.0.0 (2017-01-06)
+
+- After many months of v2 being in an RC state with many companies and users running it in
+  production, the inclusion of some improvements to the middlewares, we are very pleased to
+  announce v2.0.0 of chi.
+
+
+## v2.0.0-rc1 (2016-07-26)
+
+- Huge update! chi v2 is a large refactor targetting Go 1.7+. As of Go 1.7, the popular
+  community `"net/context"` package has been included in the standard library as `"context"` and
+  utilized by `"net/http"` and `http.Request` to managing deadlines, cancelation signals and other
+  request-scoped values. We're very excited about the new context addition and are proud to
+  introduce chi v2, a minimal and powerful routing package for building large HTTP services,
+  with zero external dependencies. Chi focuses on idiomatic design and encourages the use of 
+  stdlib HTTP handlers and middlwares.
+- chi v2 deprecates its `chi.Handler` interface and requires `http.Handler` or `http.HandlerFunc`
+- chi v2 stores URL routing parameters and patterns in the standard request context: `r.Context()`
+- chi v2 lower-level routing context is accessible by `chi.RouteContext(r.Context()) *chi.Context`,
+  which provides direct access to URL routing parameters, the routing path and the matching
+  routing patterns.
+- Users upgrading from chi v1 to v2, need to:
+  1. Update the old chi.Handler signature, `func(ctx context.Context, w http.ResponseWriter, r *http.Request)` to
+     the standard http.Handler: `func(w http.ResponseWriter, r *http.Request)`
+  2. Use `chi.URLParam(r *http.Request, paramKey string) string`
+     or `URLParamFromCtx(ctx context.Context, paramKey string) string` to access a url parameter value
+
+
+## v1.0.0 (2016-07-01)
+
+- Released chi v1 stable https://github.com/go-chi/chi/tree/v1.0.0 for Go 1.6 and older.
+
+
+## v0.9.0 (2016-03-31)
+
+- Reuse context objects via sync.Pool for zero-allocation routing [#33](https://github.com/go-chi/chi/pull/33)
+- BREAKING NOTE: due to subtle API changes, previously `chi.URLParams(ctx)["id"]` used to access url parameters
+  has changed to: `chi.URLParam(ctx, "id")`

vendor/github.com/go-chi/chi/CONTRIBUTING.md

@@ -0,0 +1,31 @@
+# Contributing
+
+## Prerequisites
+
+1. [Install Go][go-install].
+2. Download the sources and switch the working directory:
+
+    ```bash
+    go get -u -d github.com/go-chi/chi
+    cd $GOPATH/src/github.com/go-chi/chi
+    ```
+
+## Submitting a Pull Request
+
+A typical workflow is:
+
+1. [Fork the repository.][fork] [This tip maybe also helpful.][go-fork-tip]
+2. [Create a topic branch.][branch]
+3. Add tests for your change.
+4. Run `go test`. If your tests pass, return to the step 3.
+5. Implement the change and ensure the steps from the previous step pass.
+6. Run `goimports -w .`, to ensure the new code conforms to Go formatting guideline.
+7. [Add, commit and push your changes.][git-help]
+8. [Submit a pull request.][pull-req]
+
+[go-install]: https://golang.org/doc/install
+[go-fork-tip]: http://blog.campoy.cat/2014/03/github-and-go-forking-pull-requests-and.html
+[fork]: https://help.github.com/articles/fork-a-repo
+[branch]: http://learn.github.com/p/branching.html
+[git-help]: https://guides.github.com
+[pull-req]: https://help.github.com/articles/using-pull-requests

vendor/github.com/go-chi/chi/LICENSE

@@ -0,0 +1,20 @@
+Copyright (c) 2015-present Peter Kieltyka (https://github.com/pkieltyka), Google Inc.
+
+MIT License
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the "Software"), to deal in
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+the Software, and to permit persons to whom the Software is furnished to do so,
+subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

vendor/github.com/go-chi/chi/Makefile

@@ -0,0 +1,14 @@
+all:
+	@echo "**********************************************************"
+	@echo "**                    chi build tool                    **"
+	@echo "**********************************************************"
+
+
+test:
+	go clean -testcache && $(MAKE) test-router && $(MAKE) test-middleware
+
+test-router:
+	go test -race -v .
+
+test-middleware:
+	go test -race -v ./middleware

vendor/github.com/go-chi/chi/README.md

@@ -0,0 +1,511 @@
+# <img alt="chi" src="https://cdn.rawgit.com/go-chi/chi/master/_examples/chi.svg" width="220" />
+
+
+[![GoDoc Widget]][GoDoc] [![Travis Widget]][Travis]
+
+`chi` is a lightweight, idiomatic and composable router for building Go HTTP services. It's
+especially good at helping you write large REST API services that are kept maintainable as your
+project grows and changes. `chi` is built on the new `context` package introduced in Go 1.7 to
+handle signaling, cancelation and request-scoped values across a handler chain.
+
+The focus of the project has been to seek out an elegant and comfortable design for writing
+REST API servers, written during the development of the Pressly API service that powers our
+public API service, which in turn powers all of our client-side applications.
+
+The key considerations of chi's design are: project structure, maintainability, standard http
+handlers (stdlib-only), developer productivity, and deconstructing a large system into many small
+parts. The core router `github.com/go-chi/chi` is quite small (less than 1000 LOC), but we've also
+included some useful/optional subpackages: [middleware](/middleware), [render](https://github.com/go-chi/render)
+and [docgen](https://github.com/go-chi/docgen). We hope you enjoy it too!
+
+## Install
+
+`go get -u github.com/go-chi/chi`
+
+
+## Features
+
+* **Lightweight** - cloc'd in ~1000 LOC for the chi router
+* **Fast** - yes, see [benchmarks](#benchmarks)
+* **100% compatible with net/http** - use any http or middleware pkg in the ecosystem that is also compatible with `net/http`
+* **Designed for modular/composable APIs** - middlewares, inline middlewares, route groups and sub-router mounting
+* **Context control** - built on new `context` package, providing value chaining, cancellations and timeouts
+* **Robust** - in production at Pressly, CloudFlare, Heroku, 99Designs, and many others (see [discussion](https://github.com/go-chi/chi/issues/91))
+* **Doc generation** - `docgen` auto-generates routing documentation from your source to JSON or Markdown
+* **Go.mod support** - v1.x of chi (starting from v1.5.0), now has go.mod support (see [CHANGELOG](https://github.com/go-chi/chi/blob/master/CHANGELOG.md#v150-2020-11-12---now-with-gomod-support))
+* **No external dependencies** - plain ol' Go stdlib + net/http
+
+
+## Examples
+
+See [_examples/](https://github.com/go-chi/chi/blob/master/_examples/) for a variety of examples.
+
+
+**As easy as:**
+
+```go
+package main
+
+import (
+	"net/http"
+
+	"github.com/go-chi/chi"
+	"github.com/go-chi/chi/middleware"
+)
+
+func main() {
+	r := chi.NewRouter()
+	r.Use(middleware.Logger)
+	r.Get("/", func(w http.ResponseWriter, r *http.Request) {
+		w.Write([]byte("welcome"))
+	})
+	http.ListenAndServe(":3000", r)
+}
+```
+
+**REST Preview:**
+
+Here is a little preview of how routing looks like with chi. Also take a look at the generated routing docs
+in JSON ([routes.json](https://github.com/go-chi/chi/blob/master/_examples/rest/routes.json)) and in
+Markdown ([routes.md](https://github.com/go-chi/chi/blob/master/_examples/rest/routes.md)).
+
+I highly recommend reading the source of the [examples](https://github.com/go-chi/chi/blob/master/_examples/) listed
+above, they will show you all the features of chi and serve as a good form of documentation.
+
+```go
+import (
+  //...
+  "context"
+  "github.com/go-chi/chi"
+  "github.com/go-chi/chi/middleware"
+)
+
+func main() {
+  r := chi.NewRouter()
+
+  // A good base middleware stack
+  r.Use(middleware.RequestID)
+  r.Use(middleware.RealIP)
+  r.Use(middleware.Logger)
+  r.Use(middleware.Recoverer)
+
+  // Set a timeout value on the request context (ctx), that will signal
+  // through ctx.Done() that the request has timed out and further
+  // processing should be stopped.
+  r.Use(middleware.Timeout(60 * time.Second))
+
+  r.Get("/", func(w http.ResponseWriter, r *http.Request) {
+    w.Write([]byte("hi"))
+  })
+
+  // RESTy routes for "articles" resource
+  r.Route("/articles", func(r chi.Router) {
+    r.With(paginate).Get("/", listArticles)                           // GET /articles
+    r.With(paginate).Get("/{month}-{day}-{year}", listArticlesByDate) // GET /articles/01-16-2017
+
+    r.Post("/", createArticle)                                        // POST /articles
+    r.Get("/search", searchArticles)                                  // GET /articles/search
+
+    // Regexp url parameters:
+    r.Get("/{articleSlug:[a-z-]+}", getArticleBySlug)                // GET /articles/home-is-toronto
+
+    // Subrouters:
+    r.Route("/{articleID}", func(r chi.Router) {
+      r.Use(ArticleCtx)
+      r.Get("/", getArticle)                                          // GET /articles/123
+      r.Put("/", updateArticle)                                       // PUT /articles/123
+      r.Delete("/", deleteArticle)                                    // DELETE /articles/123
+    })
+  })
+
+  // Mount the admin sub-router
+  r.Mount("/admin", adminRouter())
+
+  http.ListenAndServe(":3333", r)
+}
+
+func ArticleCtx(next http.Handler) http.Handler {
+  return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+    articleID := chi.URLParam(r, "articleID")
+    article, err := dbGetArticle(articleID)
+    if err != nil {
+      http.Error(w, http.StatusText(404), 404)
+      return
+    }
+    ctx := context.WithValue(r.Context(), "article", article)
+    next.ServeHTTP(w, r.WithContext(ctx))
+  })
+}
+
+func getArticle(w http.ResponseWriter, r *http.Request) {
+  ctx := r.Context()
+  article, ok := ctx.Value("article").(*Article)
+  if !ok {
+    http.Error(w, http.StatusText(422), 422)
+    return
+  }
+  w.Write([]byte(fmt.Sprintf("title:%s", article.Title)))
+}
+
+// A completely separate router for administrator routes
+func adminRouter() http.Handler {
+  r := chi.NewRouter()
+  r.Use(AdminOnly)
+  r.Get("/", adminIndex)
+  r.Get("/accounts", adminListAccounts)
+  return r
+}
+
+func AdminOnly(next http.Handler) http.Handler {
+  return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+    ctx := r.Context()
+    perm, ok := ctx.Value("acl.permission").(YourPermissionType)
+    if !ok || !perm.IsAdmin() {
+      http.Error(w, http.StatusText(403), 403)
+      return
+    }
+    next.ServeHTTP(w, r)
+  })
+}
+```
+
+
+## Router interface
+
+chi's router is based on a kind of [Patricia Radix trie](https://en.wikipedia.org/wiki/Radix_tree).
+The router is fully compatible with `net/http`.
+
+Built on top of the tree is the `Router` interface:
+
+```go
+// Router consisting of the core routing methods used by chi's Mux,
+// using only the standard net/http.
+type Router interface {
+	http.Handler
+	Routes
+
+	// Use appends one or more middlewares onto the Router stack.
+	Use(middlewares ...func(http.Handler) http.Handler)
+
+	// With adds inline middlewares for an endpoint handler.
+	With(middlewares ...func(http.Handler) http.Handler) Router
+
+	// Group adds a new inline-Router along the current routing
+	// path, with a fresh middleware stack for the inline-Router.
+	Group(fn func(r Router)) Router
+
+	// Route mounts a sub-Router along a `pattern`` string.
+	Route(pattern string, fn func(r Router)) Router
+
+	// Mount attaches another http.Handler along ./pattern/*
+	Mount(pattern string, h http.Handler)
+
+	// Handle and HandleFunc adds routes for `pattern` that matches
+	// all HTTP methods.
+	Handle(pattern string, h http.Handler)
+	HandleFunc(pattern string, h http.HandlerFunc)
+
+	// Method and MethodFunc adds routes for `pattern` that matches
+	// the `method` HTTP method.
+	Method(method, pattern string, h http.Handler)
+	MethodFunc(method, pattern string, h http.HandlerFunc)
+
+	// HTTP-method routing along `pattern`
+	Connect(pattern string, h http.HandlerFunc)
+	Delete(pattern string, h http.HandlerFunc)
+	Get(pattern string, h http.HandlerFunc)
+	Head(pattern string, h http.HandlerFunc)
+	Options(pattern string, h http.HandlerFunc)
+	Patch(pattern string, h http.HandlerFunc)
+	Post(pattern string, h http.HandlerFunc)
+	Put(pattern string, h http.HandlerFunc)
+	Trace(pattern string, h http.HandlerFunc)
+
+	// NotFound defines a handler to respond whenever a route could
+	// not be found.
+	NotFound(h http.HandlerFunc)
+
+	// MethodNotAllowed defines a handler to respond whenever a method is
+	// not allowed.
+	MethodNotAllowed(h http.HandlerFunc)
+}
+
+// Routes interface adds two methods for router traversal, which is also
+// used by the github.com/go-chi/docgen package to generate documentation for Routers.
+type Routes interface {
+	// Routes returns the routing tree in an easily traversable structure.
+	Routes() []Route
+
+	// Middlewares returns the list of middlewares in use by the router.
+	Middlewares() Middlewares
+
+	// Match searches the routing tree for a handler that matches
+	// the method/path - similar to routing a http request, but without
+	// executing the handler thereafter.
+	Match(rctx *Context, method, path string) bool
+}
+```
+
+Each routing method accepts a URL `pattern` and chain of `handlers`. The URL pattern
+supports named params (ie. `/users/{userID}`) and wildcards (ie. `/admin/*`). URL parameters
+can be fetched at runtime by calling `chi.URLParam(r, "userID")` for named parameters
+and `chi.URLParam(r, "*")` for a wildcard parameter.
+
+
+### Middleware handlers
+
+chi's middlewares are just stdlib net/http middleware handlers. There is nothing special
+about them, which means the router and all the tooling is designed to be compatible and
+friendly with any middleware in the community. This offers much better extensibility and reuse
+of packages and is at the heart of chi's purpose.
+
+Here is an example of a standard net/http middleware where we assign a context key `"user"`
+the value of `"123"`. This middleware sets a hypothetical user identifier on the request
+context and calls the next handler in the chain.
+
+```go
+// HTTP middleware setting a value on the request context
+func MyMiddleware(next http.Handler) http.Handler {
+  return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+    // create new context from `r` request context, and assign key `"user"`
+    // to value of `"123"`
+    ctx := context.WithValue(r.Context(), "user", "123")
+
+    // call the next handler in the chain, passing the response writer and
+    // the updated request object with the new context value.
+    //
+    // note: context.Context values are nested, so any previously set
+    // values will be accessible as well, and the new `"user"` key
+    // will be accessible from this point forward.
+    next.ServeHTTP(w, r.WithContext(ctx))
+  })
+}
+```
+
+
+### Request handlers
+
+chi uses standard net/http request handlers. This little snippet is an example of a http.Handler
+func that reads a user identifier from the request context - hypothetically, identifying
+the user sending an authenticated request, validated+set by a previous middleware handler.
+
+```go
+// HTTP handler accessing data from the request context.
+func MyRequestHandler(w http.ResponseWriter, r *http.Request) {
+  // here we read from the request context and fetch out `"user"` key set in
+  // the MyMiddleware example above.
+  user := r.Context().Value("user").(string)
+
+  // respond to the client
+  w.Write([]byte(fmt.Sprintf("hi %s", user)))
+}
+```
+
+
+### URL parameters
+
+chi's router parses and stores URL parameters right onto the request context. Here is
+an example of how to access URL params in your net/http handlers. And of course, middlewares
+are able to access the same information.
+
+```go
+// HTTP handler accessing the url routing parameters.
+func MyRequestHandler(w http.ResponseWriter, r *http.Request) {
+  // fetch the url parameter `"userID"` from the request of a matching
+  // routing pattern. An example routing pattern could be: /users/{userID}
+  userID := chi.URLParam(r, "userID")
+
+  // fetch `"key"` from the request context
+  ctx := r.Context()
+  key := ctx.Value("key").(string)
+
+  // respond to the client
+  w.Write([]byte(fmt.Sprintf("hi %v, %v", userID, key)))
+}
+```
+
+
+## Middlewares
+
+chi comes equipped with an optional `middleware` package, providing a suite of standard
+`net/http` middlewares. Please note, any middleware in the ecosystem that is also compatible
+with `net/http` can be used with chi's mux.
+
+### Core middlewares
+
+----------------------------------------------------------------------------------------------------
+| chi/middleware Handler | description                                                             |
+| :--------------------- | :---------------------------------------------------------------------- |
+| [AllowContentEncoding] | Enforces a whitelist of request Content-Encoding headers                |
+| [AllowContentType]     | Explicit whitelist of accepted request Content-Types                    |
+| [BasicAuth]            | Basic HTTP authentication                                               |
+| [Compress]             | Gzip compression for clients that accept compressed responses           |
+| [ContentCharset]       | Ensure charset for Content-Type request headers                         |
+| [CleanPath]            | Clean double slashes from request path                                  |
+| [GetHead]              | Automatically route undefined HEAD requests to GET handlers             |
+| [Heartbeat]            | Monitoring endpoint to check the servers pulse                          |
+| [Logger]               | Logs the start and end of each request with the elapsed processing time |
+| [NoCache]              | Sets response headers to prevent clients from caching                   |
+| [Profiler]             | Easily attach net/http/pprof to your routers                            |
+| [RealIP]               | Sets a http.Request's RemoteAddr to either X-Forwarded-For or X-Real-IP |
+| [Recoverer]            | Gracefully absorb panics and prints the stack trace                     |
+| [RequestID]            | Injects a request ID into the context of each request                   |
+| [RedirectSlashes]      | Redirect slashes on routing paths                                       |
+| [RouteHeaders]         | Route handling for request headers                                      |
+| [SetHeader]            | Short-hand middleware to set a response header key/value                |
+| [StripSlashes]         | Strip slashes on routing paths                                          |
+| [Throttle]             | Puts a ceiling on the number of concurrent requests                     |
+| [Timeout]              | Signals to the request context when the timeout deadline is reached     |
+| [URLFormat]            | Parse extension from url and put it on request context                  |
+| [WithValue]            | Short-hand middleware to set a key/value on the request context         |
+----------------------------------------------------------------------------------------------------
+
+[AllowContentEncoding]: https://pkg.go.dev/github.com/go-chi/chi/middleware#AllowContentEncoding
+[AllowContentType]: https://pkg.go.dev/github.com/go-chi/chi/middleware#AllowContentType
+[BasicAuth]: https://pkg.go.dev/github.com/go-chi/chi/middleware#BasicAuth
+[Compress]: https://pkg.go.dev/github.com/go-chi/chi/middleware#Compress
+[ContentCharset]: https://pkg.go.dev/github.com/go-chi/chi/middleware#ContentCharset
+[CleanPath]: https://pkg.go.dev/github.com/go-chi/chi/middleware#CleanPath
+[GetHead]: https://pkg.go.dev/github.com/go-chi/chi/middleware#GetHead
+[GetReqID]: https://pkg.go.dev/github.com/go-chi/chi/middleware#GetReqID
+[Heartbeat]: https://pkg.go.dev/github.com/go-chi/chi/middleware#Heartbeat
+[Logger]: https://pkg.go.dev/github.com/go-chi/chi/middleware#Logger
+[NoCache]: https://pkg.go.dev/github.com/go-chi/chi/middleware#NoCache
+[Profiler]: https://pkg.go.dev/github.com/go-chi/chi/middleware#Profiler
+[RealIP]: https://pkg.go.dev/github.com/go-chi/chi/middleware#RealIP
+[Recoverer]: https://pkg.go.dev/github.com/go-chi/chi/middleware#Recoverer
+[RedirectSlashes]: https://pkg.go.dev/github.com/go-chi/chi/middleware#RedirectSlashes
+[RequestLogger]: https://pkg.go.dev/github.com/go-chi/chi/middleware#RequestLogger
+[RequestID]: https://pkg.go.dev/github.com/go-chi/chi/middleware#RequestID
+[RouteHeaders]: https://pkg.go.dev/github.com/go-chi/chi/middleware#RouteHeaders
+[SetHeader]: https://pkg.go.dev/github.com/go-chi/chi/middleware#SetHeader
+[StripSlashes]: https://pkg.go.dev/github.com/go-chi/chi/middleware#StripSlashes
+[Throttle]: https://pkg.go.dev/github.com/go-chi/chi/middleware#Throttle
+[ThrottleBacklog]: https://pkg.go.dev/github.com/go-chi/chi/middleware#ThrottleBacklog
+[ThrottleWithOpts]: https://pkg.go.dev/github.com/go-chi/chi/middleware#ThrottleWithOpts
+[Timeout]: https://pkg.go.dev/github.com/go-chi/chi/middleware#Timeout
+[URLFormat]: https://pkg.go.dev/github.com/go-chi/chi/middleware#URLFormat
+[WithLogEntry]: https://pkg.go.dev/github.com/go-chi/chi/middleware#WithLogEntry
+[WithValue]: https://pkg.go.dev/github.com/go-chi/chi/middleware#WithValue
+[Compressor]: https://pkg.go.dev/github.com/go-chi/chi/middleware#Compressor
+[DefaultLogFormatter]: https://pkg.go.dev/github.com/go-chi/chi/middleware#DefaultLogFormatter
+[EncoderFunc]: https://pkg.go.dev/github.com/go-chi/chi/middleware#EncoderFunc
+[HeaderRoute]: https://pkg.go.dev/github.com/go-chi/chi/middleware#HeaderRoute
+[HeaderRouter]: https://pkg.go.dev/github.com/go-chi/chi/middleware#HeaderRouter
+[LogEntry]: https://pkg.go.dev/github.com/go-chi/chi/middleware#LogEntry
+[LogFormatter]: https://pkg.go.dev/github.com/go-chi/chi/middleware#LogFormatter
+[LoggerInterface]: https://pkg.go.dev/github.com/go-chi/chi/middleware#LoggerInterface
+[ThrottleOpts]: https://pkg.go.dev/github.com/go-chi/chi/middleware#ThrottleOpts
+[WrapResponseWriter]: https://pkg.go.dev/github.com/go-chi/chi/middleware#WrapResponseWriter
+
+### Extra middlewares & packages
+
+Please see https://github.com/go-chi for additional packages.
+
+--------------------------------------------------------------------------------------------------------------------
+| package                                            | description                                                 |
+|:---------------------------------------------------|:-------------------------------------------------------------
+| [cors](https://github.com/go-chi/cors)             | Cross-origin resource sharing (CORS)                        |
+| [docgen](https://github.com/go-chi/docgen)         | Print chi.Router routes at runtime                          |
+| [jwtauth](https://github.com/go-chi/jwtauth)       | JWT authentication                                          |
+| [hostrouter](https://github.com/go-chi/hostrouter) | Domain/host based request routing                           |
+| [httplog](https://github.com/go-chi/httplog)       | Small but powerful structured HTTP request logging          |
+| [httprate](https://github.com/go-chi/httprate)     | HTTP request rate limiter                                   |
+| [httptracer](https://github.com/go-chi/httptracer) | HTTP request performance tracing library                    |
+| [httpvcr](https://github.com/go-chi/httpvcr)       | Write deterministic tests for external sources              |
+| [stampede](https://github.com/go-chi/stampede)     | HTTP request coalescer                                      |
+--------------------------------------------------------------------------------------------------------------------
+
+
+## context?
+
+`context` is a tiny pkg that provides simple interface to signal context across call stacks
+and goroutines. It was originally written by [Sameer Ajmani](https://github.com/Sajmani)
+and is available in stdlib since go1.7.
+
+Learn more at https://blog.golang.org/context
+
+and..
+* Docs: https://golang.org/pkg/context
+* Source: https://github.com/golang/go/tree/master/src/context
+
+
+## Benchmarks
+
+The benchmark suite: https://github.com/pkieltyka/go-http-routing-benchmark
+
+Results as of Nov 29, 2020 with Go 1.15.5 on Linux AMD 3950x
+
+```shell
+BenchmarkChi_Param          	3075895	        384 ns/op	      400 B/op      2 allocs/op
+BenchmarkChi_Param5         	2116603	        566 ns/op	      400 B/op      2 allocs/op
+BenchmarkChi_Param20        	 964117	       1227 ns/op	      400 B/op      2 allocs/op
+BenchmarkChi_ParamWrite     	2863413	        420 ns/op	      400 B/op      2 allocs/op
+BenchmarkChi_GithubStatic   	3045488	        395 ns/op	      400 B/op      2 allocs/op
+BenchmarkChi_GithubParam    	2204115	        540 ns/op	      400 B/op      2 allocs/op
+BenchmarkChi_GithubAll      	  10000	     113811 ns/op	    81203 B/op    406 allocs/op
+BenchmarkChi_GPlusStatic    	3337485	        359 ns/op	      400 B/op      2 allocs/op
+BenchmarkChi_GPlusParam     	2825853	        423 ns/op	      400 B/op      2 allocs/op
+BenchmarkChi_GPlus2Params   	2471697	        483 ns/op	      400 B/op      2 allocs/op
+BenchmarkChi_GPlusAll       	 194220	       5950 ns/op	     5200 B/op     26 allocs/op
+BenchmarkChi_ParseStatic    	3365324	        356 ns/op	      400 B/op      2 allocs/op
+BenchmarkChi_ParseParam     	2976614	        404 ns/op	      400 B/op      2 allocs/op
+BenchmarkChi_Parse2Params   	2638084	        439 ns/op	      400 B/op      2 allocs/op
+BenchmarkChi_ParseAll       	 109567	      11295 ns/op	    10400 B/op     52 allocs/op
+BenchmarkChi_StaticAll      	  16846	      71308 ns/op	    62802 B/op    314 allocs/op
+```
+
+Comparison with other routers: https://gist.github.com/pkieltyka/123032f12052520aaccab752bd3e78cc
+
+NOTE: the allocs in the benchmark above are from the calls to http.Request's
+`WithContext(context.Context)` method that clones the http.Request, sets the `Context()`
+on the duplicated (alloc'd) request and returns it the new request object. This is just
+how setting context on a request in Go works.
+
+
+## Go module support & note on chi's versioning
+
+* Go.mod support means we reset our versioning starting from v1.5 (see [CHANGELOG](https://github.com/go-chi/chi/blob/master/CHANGELOG.md#v150-2020-11-12---now-with-gomod-support))
+* All older tags are preserved, are backwards-compatible and will "just work" as they
+* Brand new systems can run `go get -u github.com/go-chi/chi` as normal, or `go get -u github.com/go-chi/chi@latest`
+to install chi, which will install v1.x+ built with go.mod support, starting from v1.5.0.
+* For existing projects who want to upgrade to the latest go.mod version, run: `go get -u github.com/go-chi/chi@v1.5.0`,
+which will get you on the go.mod version line (as Go's mod cache may still remember v4.x).
+* Any breaking changes will bump a "minor" release and backwards-compatible improvements/fixes will bump a "tiny" release.
+
+
+## Credits
+
+* Carl Jackson for https://github.com/zenazn/goji
+  * Parts of chi's thinking comes from goji, and chi's middleware package
+    sources from goji.
+* Armon Dadgar for https://github.com/armon/go-radix
+* Contributions: [@VojtechVitek](https://github.com/VojtechVitek)
+
+We'll be more than happy to see [your contributions](./CONTRIBUTING.md)!
+
+
+## Beyond REST
+
+chi is just a http router that lets you decompose request handling into many smaller layers.
+Many companies use chi to write REST services for their public APIs. But, REST is just a convention
+for managing state via HTTP, and there's a lot of other pieces required to write a complete client-server
+system or network of microservices.
+
+Looking beyond REST, I also recommend some newer works in the field:
+* [webrpc](https://github.com/webrpc/webrpc) - Web-focused RPC client+server framework with code-gen
+* [gRPC](https://github.com/grpc/grpc-go) - Google's RPC framework via protobufs
+* [graphql](https://github.com/99designs/gqlgen) - Declarative query language
+* [NATS](https://nats.io) - lightweight pub-sub
+
+
+## License
+
+Copyright (c) 2015-present [Peter Kieltyka](https://github.com/pkieltyka)
+
+Licensed under [MIT License](./LICENSE)
+
+[GoDoc]: https://pkg.go.dev/github.com/go-chi/chi?tab=versions
+[GoDoc Widget]: https://godoc.org/github.com/go-chi/chi?status.svg
+[Travis]: https://travis-ci.org/go-chi/chi
+[Travis Widget]: https://travis-ci.org/go-chi/chi.svg?branch=master

vendor/github.com/go-chi/chi/chain.go

@@ -0,0 +1,49 @@
+package chi
+
+import "net/http"
+
+// Chain returns a Middlewares type from a slice of middleware handlers.
+func Chain(middlewares ...func(http.Handler) http.Handler) Middlewares {
+	return Middlewares(middlewares)
+}
+
+// Handler builds and returns a http.Handler from the chain of middlewares,
+// with `h http.Handler` as the final handler.
+func (mws Middlewares) Handler(h http.Handler) http.Handler {
+	return &ChainHandler{mws, h, chain(mws, h)}
+}
+
+// HandlerFunc builds and returns a http.Handler from the chain of middlewares,
+// with `h http.Handler` as the final handler.
+func (mws Middlewares) HandlerFunc(h http.HandlerFunc) http.Handler {
+	return &ChainHandler{mws, h, chain(mws, h)}
+}
+
+// ChainHandler is a http.Handler with support for handler composition and
+// execution.
+type ChainHandler struct {
+	Middlewares Middlewares
+	Endpoint    http.Handler
+	chain       http.Handler
+}
+
+func (c *ChainHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+	c.chain.ServeHTTP(w, r)
+}
+
+// chain builds a http.Handler composed of an inline middleware stack and endpoint
+// handler in the order they are passed.
+func chain(middlewares []func(http.Handler) http.Handler, endpoint http.Handler) http.Handler {
+	// Return ahead of time if there aren't any middlewares for the chain
+	if len(middlewares) == 0 {
+		return endpoint
+	}
+
+	// Wrap the end handler with the middleware chain
+	h := middlewares[len(middlewares)-1](endpoint)
+	for i := len(middlewares) - 2; i >= 0; i-- {
+		h = middlewares[i](h)
+	}
+
+	return h
+}

vendor/github.com/go-chi/chi/chi.go

@@ -0,0 +1,134 @@
+//
+// Package chi is a small, idiomatic and composable router for building HTTP services.
+//
+// chi requires Go 1.10 or newer.
+//
+// Example:
+//  package main
+//
+//  import (
+//  	"net/http"
+//
+//  	"github.com/go-chi/chi"
+//  	"github.com/go-chi/chi/middleware"
+//  )
+//
+//  func main() {
+//  	r := chi.NewRouter()
+//  	r.Use(middleware.Logger)
+//  	r.Use(middleware.Recoverer)
+//
+//  	r.Get("/", func(w http.ResponseWriter, r *http.Request) {
+//  		w.Write([]byte("root."))
+//  	})
+//
+//  	http.ListenAndServe(":3333", r)
+//  }
+//
+// See github.com/go-chi/chi/_examples/ for more in-depth examples.
+//
+// URL patterns allow for easy matching of path components in HTTP
+// requests. The matching components can then be accessed using
+// chi.URLParam(). All patterns must begin with a slash.
+//
+// A simple named placeholder {name} matches any sequence of characters
+// up to the next / or the end of the URL. Trailing slashes on paths must
+// be handled explicitly.
+//
+// A placeholder with a name followed by a colon allows a regular
+// expression match, for example {number:\\d+}. The regular expression
+// syntax is Go's normal regexp RE2 syntax, except that regular expressions
+// including { or } are not supported, and / will never be
+// matched. An anonymous regexp pattern is allowed, using an empty string
+// before the colon in the placeholder, such as {:\\d+}
+//
+// The special placeholder of asterisk matches the rest of the requested
+// URL. Any trailing characters in the pattern are ignored. This is the only
+// placeholder which will match / characters.
+//
+// Examples:
+//  "/user/{name}" matches "/user/jsmith" but not "/user/jsmith/info" or "/user/jsmith/"
+//  "/user/{name}/info" matches "/user/jsmith/info"
+//  "/page/*" matches "/page/intro/latest"
+//  "/page/*/index" also matches "/page/intro/latest"
+//  "/date/{yyyy:\\d\\d\\d\\d}/{mm:\\d\\d}/{dd:\\d\\d}" matches "/date/2017/04/01"
+//
+package chi
+
+import "net/http"
+
+// NewRouter returns a new Mux object that implements the Router interface.
+func NewRouter() *Mux {
+	return NewMux()
+}
+
+// Router consisting of the core routing methods used by chi's Mux,
+// using only the standard net/http.
+type Router interface {
+	http.Handler
+	Routes
+
+	// Use appends one or more middlewares onto the Router stack.
+	Use(middlewares ...func(http.Handler) http.Handler)
+
+	// With adds inline middlewares for an endpoint handler.
+	With(middlewares ...func(http.Handler) http.Handler) Router
+
+	// Group adds a new inline-Router along the current routing
+	// path, with a fresh middleware stack for the inline-Router.
+	Group(fn func(r Router)) Router
+
+	// Route mounts a sub-Router along a `pattern`` string.
+	Route(pattern string, fn func(r Router)) Router
+
+	// Mount attaches another http.Handler along ./pattern/*
+	Mount(pattern string, h http.Handler)
+
+	// Handle and HandleFunc adds routes for `pattern` that matches
+	// all HTTP methods.
+	Handle(pattern string, h http.Handler)
+	HandleFunc(pattern string, h http.HandlerFunc)
+
+	// Method and MethodFunc adds routes for `pattern` that matches
+	// the `method` HTTP method.
+	Method(method, pattern string, h http.Handler)
+	MethodFunc(method, pattern string, h http.HandlerFunc)
+
+	// HTTP-method routing along `pattern`
+	Connect(pattern string, h http.HandlerFunc)
+	Delete(pattern string, h http.HandlerFunc)
+	Get(pattern string, h http.HandlerFunc)
+	Head(pattern string, h http.HandlerFunc)
+	Options(pattern string, h http.HandlerFunc)
+	Patch(pattern string, h http.HandlerFunc)
+	Post(pattern string, h http.HandlerFunc)
+	Put(pattern string, h http.HandlerFunc)
+	Trace(pattern string, h http.HandlerFunc)
+
+	// NotFound defines a handler to respond whenever a route could
+	// not be found.
+	NotFound(h http.HandlerFunc)
+
+	// MethodNotAllowed defines a handler to respond whenever a method is
+	// not allowed.
+	MethodNotAllowed(h http.HandlerFunc)
+}
+
+// Routes interface adds two methods for router traversal, which is also
+// used by the `docgen` subpackage to generation documentation for Routers.
+type Routes interface {
+	// Routes returns the routing tree in an easily traversable structure.
+	Routes() []Route
+
+	// Middlewares returns the list of middlewares in use by the router.
+	Middlewares() Middlewares
+
+	// Match searches the routing tree for a handler that matches
+	// the method/path - similar to routing a http request, but without
+	// executing the handler thereafter.
+	Match(rctx *Context, method, path string) bool
+}
+
+// Middlewares type is a slice of standard middleware handlers with methods
+// to compose middleware chains and http.Handler's.
+type Middlewares []func(http.Handler) http.Handler

vendor/github.com/go-chi/chi/context.go

@@ -0,0 +1,157 @@
+package chi
+
+import (
+	"context"
+	"net/http"
+	"strings"
+)
+
+// URLParam returns the url parameter from a http.Request object.
+func URLParam(r *http.Request, key string) string {
+	if rctx := RouteContext(r.Context()); rctx != nil {
+		return rctx.URLParam(key)
+	}
+	return ""
+}
+
+// URLParamFromCtx returns the url parameter from a http.Request Context.
+func URLParamFromCtx(ctx context.Context, key string) string {
+	if rctx := RouteContext(ctx); rctx != nil {
+		return rctx.URLParam(key)
+	}
+	return ""
+}
+
+// RouteContext returns chi's routing Context object from a
+// http.Request Context.
+func RouteContext(ctx context.Context) *Context {
+	val, _ := ctx.Value(RouteCtxKey).(*Context)
+	return val
+}
+
+// NewRouteContext returns a new routing Context object.
+func NewRouteContext() *Context {
+	return &Context{}
+}
+
+var (
+	// RouteCtxKey is the context.Context key to store the request context.
+	RouteCtxKey = &contextKey{"RouteContext"}
+)
+
+// Context is the default routing context set on the root node of a
+// request context to track route patterns, URL parameters and
+// an optional routing path.
+type Context struct {
+	Routes Routes
+
+	// Routing path/method override used during the route search.
+	// See Mux#routeHTTP method.
+	RoutePath   string
+	RouteMethod string
+
+	// Routing pattern stack throughout the lifecycle of the request,
+	// across all connected routers. It is a record of all matching
+	// patterns across a stack of sub-routers.
+	RoutePatterns []string
+
+	// URLParams are the stack of routeParams captured during the
+	// routing lifecycle across a stack of sub-routers.
+	URLParams RouteParams
+
+	// The endpoint routing pattern that matched the request URI path
+	// or `RoutePath` of the current sub-router. This value will update
+	// during the lifecycle of a request passing through a stack of
+	// sub-routers.
+	routePattern string
+
+	// Route parameters matched for the current sub-router. It is
+	// intentionally unexported so it cant be tampered.
+	routeParams RouteParams
+
+	// methodNotAllowed hint
+	methodNotAllowed bool
+
+	// parentCtx is the parent of this one, for using Context as a
+	// context.Context directly. This is an optimization that saves
+	// 1 allocation.
+	parentCtx context.Context
+}
+
+// Reset a routing context to its initial state.
+func (x *Context) Reset() {
+	x.Routes = nil
+	x.RoutePath = ""
+	x.RouteMethod = ""
+	x.RoutePatterns = x.RoutePatterns[:0]
+	x.URLParams.Keys = x.URLParams.Keys[:0]
+	x.URLParams.Values = x.URLParams.Values[:0]
+
+	x.routePattern = ""
+	x.routeParams.Keys = x.routeParams.Keys[:0]
+	x.routeParams.Values = x.routeParams.Values[:0]
+	x.methodNotAllowed = false
+	x.parentCtx = nil
+}
+
+// URLParam returns the corresponding URL parameter value from the request
+// routing context.
+func (x *Context) URLParam(key string) string {
+	for k := len(x.URLParams.Keys) - 1; k >= 0; k-- {
+		if x.URLParams.Keys[k] == key {
+			return x.URLParams.Values[k]
+		}
+	}
+	return ""
+}
+
+// RoutePattern builds the routing pattern string for the particular
+// request, at the particular point during routing. This means, the value
+// will change throughout the execution of a request in a router. That is
+// why its advised to only use this value after calling the next handler.
+//
+// For example,
+//
+//   func Instrument(next http.Handler) http.Handler {
+//     return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+//       next.ServeHTTP(w, r)
+//       routePattern := chi.RouteContext(r.Context()).RoutePattern()
+//       measure(w, r, routePattern)
+//   	 })
+//   }
+func (x *Context) RoutePattern() string {
+	routePattern := strings.Join(x.RoutePatterns, "")
+	return replaceWildcards(routePattern)
+}
+
+// replaceWildcards takes a route pattern and recursively replaces all
+// occurrences of "/*/" to "/".
+func replaceWildcards(p string) string {
+	if strings.Contains(p, "/*/") {
+		return replaceWildcards(strings.Replace(p, "/*/", "/", -1))
+	}
+
+	return p
+}
+
+// RouteParams is a structure to track URL routing parameters efficiently.
+type RouteParams struct {
+	Keys, Values []string
+}
+
+// Add will append a URL parameter to the end of the route param
+func (s *RouteParams) Add(key, value string) {
+	s.Keys = append(s.Keys, key)
+	s.Values = append(s.Values, value)
+}
+
+// contextKey is a value for use with context.WithValue. It's used as
+// a pointer so it fits in an interface{} without allocation. This technique
+// for defining context keys was copied from Go 1.7's new use of context in net/http.
+type contextKey struct {
+	name string
+}
+
+func (k *contextKey) String() string {
+	return "chi context value " + k.name
+}

vendor/github.com/go-chi/chi/mux.go

@@ -0,0 +1,479 @@
+package chi
+
+import (
+	"context"
+	"fmt"
+	"net/http"
+	"strings"
+	"sync"
+)
+
+var _ Router = &Mux{}
+
+// Mux is a simple HTTP route multiplexer that parses a request path,
+// records any URL params, and executes an end handler. It implements
+// the http.Handler interface and is friendly with the standard library.
+//
+// Mux is designed to be fast, minimal and offer a powerful API for building
+// modular and composable HTTP services with a large set of handlers. It's
+// particularly useful for writing large REST API services that break a handler
+// into many smaller parts composed of middlewares and end handlers.
+type Mux struct {
+	// The radix trie router
+	tree *node
+
+	// The middleware stack
+	middlewares []func(http.Handler) http.Handler
+
+	// Controls the behaviour of middleware chain generation when a mux
+	// is registered as an inline group inside another mux.
+	inline bool
+	parent *Mux
+
+	// The computed mux handler made of the chained middleware stack and
+	// the tree router
+	handler http.Handler
+
+	// Routing context pool
+	pool *sync.Pool
+
+	// Custom route not found handler
+	notFoundHandler http.HandlerFunc
+
+	// Custom method not allowed handler
+	methodNotAllowedHandler http.HandlerFunc
+}
+
+// NewMux returns a newly initialized Mux object that implements the Router
+// interface.
+func NewMux() *Mux {
+	mux := &Mux{tree: &node{}, pool: &sync.Pool{}}
+	mux.pool.New = func() interface{} {
+		return NewRouteContext()
+	}
+	return mux
+}
+
+// ServeHTTP is the single method of the http.Handler interface that makes
+// Mux interoperable with the standard library. It uses a sync.Pool to get and
+// reuse routing contexts for each request.
+func (mx *Mux) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+	// Ensure the mux has some routes defined on the mux
+	if mx.handler == nil {
+		mx.NotFoundHandler().ServeHTTP(w, r)
+		return
+	}
+
+	// Check if a routing context already exists from a parent router.
+	rctx, _ := r.Context().Value(RouteCtxKey).(*Context)
+	if rctx != nil {
+		mx.handler.ServeHTTP(w, r)
+		return
+	}
+
+	// Fetch a RouteContext object from the sync pool, and call the computed
+	// mx.handler that is comprised of mx.middlewares + mx.routeHTTP.
+	// Once the request is finished, reset the routing context and put it back
+	// into the pool for reuse from another request.
+	rctx = mx.pool.Get().(*Context)
+	rctx.Reset()
+	rctx.Routes = mx
+	rctx.parentCtx = r.Context()
+
+	// NOTE: r.WithContext() causes 2 allocations and context.WithValue() causes 1 allocation
+	r = r.WithContext(context.WithValue(r.Context(), RouteCtxKey, rctx))
+
+	// Serve the request and once its done, put the request context back in the sync pool
+	mx.handler.ServeHTTP(w, r)
+	mx.pool.Put(rctx)
+}
+
+// Use appends a middleware handler to the Mux middleware stack.
+//
+// The middleware stack for any Mux will execute before searching for a matching
+// route to a specific handler, which provides opportunity to respond early,
+// change the course of the request execution, or set request-scoped values for
+// the next http.Handler.
+func (mx *Mux) Use(middlewares ...func(http.Handler) http.Handler) {
+	if mx.handler != nil {
+		panic("chi: all middlewares must be defined before routes on a mux")
+	}
+	mx.middlewares = append(mx.middlewares, middlewares...)
+}
+
+// Handle adds the route `pattern` that matches any http method to
+// execute the `handler` http.Handler.
+func (mx *Mux) Handle(pattern string, handler http.Handler) {
+	mx.handle(mALL, pattern, handler)
+}
+
+// HandleFunc adds the route `pattern` that matches any http method to
+// execute the `handlerFn` http.HandlerFunc.
+func (mx *Mux) HandleFunc(pattern string, handlerFn http.HandlerFunc) {
+	mx.handle(mALL, pattern, handlerFn)
+}
+
+// Method adds the route `pattern` that matches `method` http method to
+// execute the `handler` http.Handler.
+func (mx *Mux) Method(method, pattern string, handler http.Handler) {
+	m, ok := methodMap[strings.ToUpper(method)]
+	if !ok {
+		panic(fmt.Sprintf("chi: '%s' http method is not supported.", method))
+	}
+	mx.handle(m, pattern, handler)
+}
+
+// MethodFunc adds the route `pattern` that matches `method` http method to
+// execute the `handlerFn` http.HandlerFunc.
+func (mx *Mux) MethodFunc(method, pattern string, handlerFn http.HandlerFunc) {
+	mx.Method(method, pattern, handlerFn)
+}
+
+// Connect adds the route `pattern` that matches a CONNECT http method to
+// execute the `handlerFn` http.HandlerFunc.
+func (mx *Mux) Connect(pattern string, handlerFn http.HandlerFunc) {
+	mx.handle(mCONNECT, pattern, handlerFn)
+}
+
+// Delete adds the route `pattern` that matches a DELETE http method to
+// execute the `handlerFn` http.HandlerFunc.
+func (mx *Mux) Delete(pattern string, handlerFn http.HandlerFunc) {
+	mx.handle(mDELETE, pattern, handlerFn)
+}
+
+// Get adds the route `pattern` that matches a GET http method to
+// execute the `handlerFn` http.HandlerFunc.
+func (mx *Mux) Get(pattern string, handlerFn http.HandlerFunc) {
+	mx.handle(mGET, pattern, handlerFn)
+}
+
+// Head adds the route `pattern` that matches a HEAD http method to
+// execute the `handlerFn` http.HandlerFunc.
+func (mx *Mux) Head(pattern string, handlerFn http.HandlerFunc) {
+	mx.handle(mHEAD, pattern, handlerFn)
+}
+
+// Options adds the route `pattern` that matches a OPTIONS http method to
+// execute the `handlerFn` http.HandlerFunc.
+func (mx *Mux) Options(pattern string, handlerFn http.HandlerFunc) {
+	mx.handle(mOPTIONS, pattern, handlerFn)
+}
+
+// Patch adds the route `pattern` that matches a PATCH http method to
+// execute the `handlerFn` http.HandlerFunc.
+func (mx *Mux) Patch(pattern string, handlerFn http.HandlerFunc) {
+	mx.handle(mPATCH, pattern, handlerFn)
+}
+
+// Post adds the route `pattern` that matches a POST http method to
+// execute the `handlerFn` http.HandlerFunc.
+func (mx *Mux) Post(pattern string, handlerFn http.HandlerFunc) {
+	mx.handle(mPOST, pattern, handlerFn)
+}
+
+// Put adds the route `pattern` that matches a PUT http method to
+// execute the `handlerFn` http.HandlerFunc.
+func (mx *Mux) Put(pattern string, handlerFn http.HandlerFunc) {
+	mx.handle(mPUT, pattern, handlerFn)
+}
+
+// Trace adds the route `pattern` that matches a TRACE http method to
+// execute the `handlerFn` http.HandlerFunc.
+func (mx *Mux) Trace(pattern string, handlerFn http.HandlerFunc) {
+	mx.handle(mTRACE, pattern, handlerFn)
+}
+
+// NotFound sets a custom http.HandlerFunc for routing paths that could
+// not be found. The default 404 handler is `http.NotFound`.
+func (mx *Mux) NotFound(handlerFn http.HandlerFunc) {
+	// Build NotFound handler chain
+	m := mx
+	h := Chain(mx.middlewares...).HandlerFunc(handlerFn).ServeHTTP
+	if mx.inline && mx.parent != nil {
+		m = mx.parent
+	}
+
+	// Update the notFoundHandler from this point forward
+	m.notFoundHandler = h
+	m.updateSubRoutes(func(subMux *Mux) {
+		if subMux.notFoundHandler == nil {
+			subMux.NotFound(h)
+		}
+	})
+}
+
+// MethodNotAllowed sets a custom http.HandlerFunc for routing paths where the
+// method is unresolved. The default handler returns a 405 with an empty body.
+func (mx *Mux) MethodNotAllowed(handlerFn http.HandlerFunc) {
+	// Build MethodNotAllowed handler chain
+	m := mx
+	h := Chain(mx.middlewares...).HandlerFunc(handlerFn).ServeHTTP
+	if mx.inline && mx.parent != nil {
+		m = mx.parent
+	}
+
+	// Update the methodNotAllowedHandler from this point forward
+	m.methodNotAllowedHandler = h
+	m.updateSubRoutes(func(subMux *Mux) {
+		if subMux.methodNotAllowedHandler == nil {
+			subMux.MethodNotAllowed(h)
+		}
+	})
+}
+
+// With adds inline middlewares for an endpoint handler.
+func (mx *Mux) With(middlewares ...func(http.Handler) http.Handler) Router {
+	// Similarly as in handle(), we must build the mux handler once additional
+	// middleware registration isn't allowed for this stack, like now.
+	if !mx.inline && mx.handler == nil {
+		mx.updateRouteHandler()
+	}
+
+	// Copy middlewares from parent inline muxs
+	var mws Middlewares
+	if mx.inline {
+		mws = make(Middlewares, len(mx.middlewares))
+		copy(mws, mx.middlewares)
+	}
+	mws = append(mws, middlewares...)
+
+	im := &Mux{
+		pool: mx.pool, inline: true, parent: mx, tree: mx.tree, middlewares: mws,
+		notFoundHandler: mx.notFoundHandler, methodNotAllowedHandler: mx.methodNotAllowedHandler,
+	}
+
+	return im
+}
+
+// Group creates a new inline-Mux with a fresh middleware stack. It's useful
+// for a group of handlers along the same routing path that use an additional
+// set of middlewares. See _examples/.
+func (mx *Mux) Group(fn func(r Router)) Router {
+	im := mx.With().(*Mux)
+	if fn != nil {
+		fn(im)
+	}
+	return im
+}
+
+// Route creates a new Mux with a fresh middleware stack and mounts it
+// along the `pattern` as a subrouter. Effectively, this is a short-hand
+// call to Mount. See _examples/.
+func (mx *Mux) Route(pattern string, fn func(r Router)) Router {
+	if fn == nil {
+		panic(fmt.Sprintf("chi: attempting to Route() a nil subrouter on '%s'", pattern))
+	}
+	subRouter := NewRouter()
+	fn(subRouter)
+	mx.Mount(pattern, subRouter)
+	return subRouter
+}
+
+// Mount attaches another http.Handler or chi Router as a subrouter along a routing
+// path. It's very useful to split up a large API as many independent routers and
+// compose them as a single service using Mount. See _examples/.
+//
+// Note that Mount() simply sets a wildcard along the `pattern` that will continue
+// routing at the `handler`, which in most cases is another chi.Router. As a result,
+// if you define two Mount() routes on the exact same pattern the mount will panic.
+func (mx *Mux) Mount(pattern string, handler http.Handler) {
+	if handler == nil {
+		panic(fmt.Sprintf("chi: attempting to Mount() a nil handler on '%s'", pattern))
+	}
+
+	// Provide runtime safety for ensuring a pattern isn't mounted on an existing
+	// routing pattern.
+	if mx.tree.findPattern(pattern+"*") || mx.tree.findPattern(pattern+"/*") {
+		panic(fmt.Sprintf("chi: attempting to Mount() a handler on an existing path, '%s'", pattern))
+	}
+
+	// Assign sub-Router's with the parent not found & method not allowed handler if not specified.
+	subr, ok := handler.(*Mux)
+	if ok && subr.notFoundHandler == nil && mx.notFoundHandler != nil {
+		subr.NotFound(mx.notFoundHandler)
+	}
+	if ok && subr.methodNotAllowedHandler == nil && mx.methodNotAllowedHandler != nil {
+		subr.MethodNotAllowed(mx.methodNotAllowedHandler)
+	}
+
+	mountHandler := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		rctx := RouteContext(r.Context())
+
+		// shift the url path past the previous subrouter
+		rctx.RoutePath = mx.nextRoutePath(rctx)
+
+		// reset the wildcard URLParam which connects the subrouter
+		n := len(rctx.URLParams.Keys) - 1
+		if n >= 0 && rctx.URLParams.Keys[n] == "*" && len(rctx.URLParams.Values) > n {
+			rctx.URLParams.Values[n] = ""
+		}
+
+		handler.ServeHTTP(w, r)
+	})
+
+	if pattern == "" || pattern[len(pattern)-1] != '/' {
+		mx.handle(mALL|mSTUB, pattern, mountHandler)
+		mx.handle(mALL|mSTUB, pattern+"/", mountHandler)
+		pattern += "/"
+	}
+
+	method := mALL
+	subroutes, _ := handler.(Routes)
+	if subroutes != nil {
+		method |= mSTUB
+	}
+	n := mx.handle(method, pattern+"*", mountHandler)
+
+	if subroutes != nil {
+		n.subroutes = subroutes
+	}
+}
+
+// Routes returns a slice of routing information from the tree,
+// useful for traversing available routes of a router.
+func (mx *Mux) Routes() []Route {
+	return mx.tree.routes()
+}
+
+// Middlewares returns a slice of middleware handler functions.
+func (mx *Mux) Middlewares() Middlewares {
+	return mx.middlewares
+}
+
+// Match searches the routing tree for a handler that matches the method/path.
+// It's similar to routing a http request, but without executing the handler
+// thereafter.
+//
+// Note: the *Context state is updated during execution, so manage
+// the state carefully or make a NewRouteContext().
+func (mx *Mux) Match(rctx *Context, method, path string) bool {
+	m, ok := methodMap[method]
+	if !ok {
+		return false
+	}
+
+	node, _, h := mx.tree.FindRoute(rctx, m, path)
+
+	if node != nil && node.subroutes != nil {
+		rctx.RoutePath = mx.nextRoutePath(rctx)
+		return node.subroutes.Match(rctx, method, rctx.RoutePath)
+	}
+
+	return h != nil
+}
+
+// NotFoundHandler returns the default Mux 404 responder whenever a route
+// cannot be found.
+func (mx *Mux) NotFoundHandler() http.HandlerFunc {
+	if mx.notFoundHandler != nil {
+		return mx.notFoundHandler
+	}
+	return http.NotFound
+}
+
+// MethodNotAllowedHandler returns the default Mux 405 responder whenever
+// a method cannot be resolved for a route.
+func (mx *Mux) MethodNotAllowedHandler() http.HandlerFunc {
+	if mx.methodNotAllowedHandler != nil {
+		return mx.methodNotAllowedHandler
+	}
+	return methodNotAllowedHandler
+}
+
+// handle registers a http.Handler in the routing tree for a particular http method
+// and routing pattern.
+func (mx *Mux) handle(method methodTyp, pattern string, handler http.Handler) *node {
+	if len(pattern) == 0 || pattern[0] != '/' {
+		panic(fmt.Sprintf("chi: routing pattern must begin with '/' in '%s'", pattern))
+	}
+
+	// Build the computed routing handler for this routing pattern.
+	if !mx.inline && mx.handler == nil {
+		mx.updateRouteHandler()
+	}
+
+	// Build endpoint handler with inline middlewares for the route
+	var h http.Handler
+	if mx.inline {
+		mx.handler = http.HandlerFunc(mx.routeHTTP)
+		h = Chain(mx.middlewares...).Handler(handler)
+	} else {
+		h = handler
+	}
+
+	// Add the endpoint to the tree and return the node
+	return mx.tree.InsertRoute(method, pattern, h)
+}
+
+// routeHTTP routes a http.Request through the Mux routing tree to serve
+// the matching handler for a particular http method.
+func (mx *Mux) routeHTTP(w http.ResponseWriter, r *http.Request) {
+	// Grab the route context object
+	rctx := r.Context().Value(RouteCtxKey).(*Context)
+
+	// The request routing path
+	routePath := rctx.RoutePath
+	if routePath == "" {
+		if r.URL.RawPath != "" {
+			routePath = r.URL.RawPath
+		} else {
+			routePath = r.URL.Path
+		}
+	}
+
+	// Check if method is supported by chi
+	if rctx.RouteMethod == "" {
+		rctx.RouteMethod = r.Method
+	}
+	method, ok := methodMap[rctx.RouteMethod]
+	if !ok {
+		mx.MethodNotAllowedHandler().ServeHTTP(w, r)
+		return
+	}
+
+	// Find the route
+	if _, _, h := mx.tree.FindRoute(rctx, method, routePath); h != nil {
+		h.ServeHTTP(w, r)
+		return
+	}
+	if rctx.methodNotAllowed {
+		mx.MethodNotAllowedHandler().ServeHTTP(w, r)
+	} else {
+		mx.NotFoundHandler().ServeHTTP(w, r)
+	}
+}
+
+func (mx *Mux) nextRoutePath(rctx *Context) string {
+	routePath := "/"
+	nx := len(rctx.routeParams.Keys) - 1 // index of last param in list
+	if nx >= 0 && rctx.routeParams.Keys[nx] == "*" && len(rctx.routeParams.Values) > nx {
+		routePath = "/" + rctx.routeParams.Values[nx]
+	}
+	return routePath
+}
+
+// Recursively update data on child routers.
+func (mx *Mux) updateSubRoutes(fn func(subMux *Mux)) {
+	for _, r := range mx.tree.routes() {
+		subMux, ok := r.SubRoutes.(*Mux)
+		if !ok {
+			continue
+		}
+		fn(subMux)
+	}
+}
+
+// updateRouteHandler builds the single mux handler that is a chain of the middleware
+// stack, as defined by calls to Use(), and the tree router (Mux) itself. After this
+// point, no other middlewares can be registered on this Mux's stack. But you can still
+// compose additional middlewares via Group()'s or using a chained middleware handler.
+func (mx *Mux) updateRouteHandler() {
+	mx.handler = chain(mx.middlewares, http.HandlerFunc(mx.routeHTTP))
+}
+
+// methodNotAllowedHandler is a helper function to respond with a 405,
+// method not allowed.
+func methodNotAllowedHandler(w http.ResponseWriter, r *http.Request) {
+	w.WriteHeader(405)
+	w.Write(nil)
+}

vendor/github.com/go-chi/chi/tree.go

@@ -0,0 +1,866 @@
+package chi
+
+// Radix tree implementation below is a based on the original work by
+// Armon Dadgar in https://github.com/armon/go-radix/blob/master/radix.go
+// (MIT licensed). It's been heavily modified for use as a HTTP routing tree.
+
+import (
+	"fmt"
+	"net/http"
+	"regexp"
+	"sort"
+	"strconv"
+	"strings"
+)
+
+type methodTyp int
+
+const (
+	mSTUB methodTyp = 1 << iota
+	mCONNECT
+	mDELETE
+	mGET
+	mHEAD
+	mOPTIONS
+	mPATCH
+	mPOST
+	mPUT
+	mTRACE
+)
+
+var mALL = mCONNECT | mDELETE | mGET | mHEAD |
+	mOPTIONS | mPATCH | mPOST | mPUT | mTRACE
+
+var methodMap = map[string]methodTyp{
+	http.MethodConnect: mCONNECT,
+	http.MethodDelete:  mDELETE,
+	http.MethodGet:     mGET,
+	http.MethodHead:    mHEAD,
+	http.MethodOptions: mOPTIONS,
+	http.MethodPatch:   mPATCH,
+	http.MethodPost:    mPOST,
+	http.MethodPut:     mPUT,
+	http.MethodTrace:   mTRACE,
+}
+
+// RegisterMethod adds support for custom HTTP method handlers, available
+// via Router#Method and Router#MethodFunc
+func RegisterMethod(method string) {
+	if method == "" {
+		return
+	}
+	method = strings.ToUpper(method)
+	if _, ok := methodMap[method]; ok {
+		return
+	}
+	n := len(methodMap)
+	if n > strconv.IntSize-2 {
+		panic(fmt.Sprintf("chi: max number of methods reached (%d)", strconv.IntSize))
+	}
+	mt := methodTyp(2 << n)
+	methodMap[method] = mt
+	mALL |= mt
+}
+
+type nodeTyp uint8
+
+const (
+	ntStatic   nodeTyp = iota // /home
+	ntRegexp                  // /{id:[0-9]+}
+	ntParam                   // /{user}
+	ntCatchAll                // /api/v1/*
+)
+
+type node struct {
+	// node type: static, regexp, param, catchAll
+	typ nodeTyp
+
+	// first byte of the prefix
+	label byte
+
+	// first byte of the child prefix
+	tail byte
+
+	// prefix is the common prefix we ignore
+	prefix string
+
+	// regexp matcher for regexp nodes
+	rex *regexp.Regexp
+
+	// HTTP handler endpoints on the leaf node
+	endpoints endpoints
+
+	// subroutes on the leaf node
+	subroutes Routes
+
+	// child nodes should be stored in-order for iteration,
+	// in groups of the node type.
+	children [ntCatchAll + 1]nodes
+}
+
+// endpoints is a mapping of http method constants to handlers
+// for a given route.
+type endpoints map[methodTyp]*endpoint
+
+type endpoint struct {
+	// endpoint handler
+	handler http.Handler
+
+	// pattern is the routing pattern for handler nodes
+	pattern string
+
+	// parameter keys recorded on handler nodes
+	paramKeys []string
+}
+
+func (s endpoints) Value(method methodTyp) *endpoint {
+	mh, ok := s[method]
+	if !ok {
+		mh = &endpoint{}
+		s[method] = mh
+	}
+	return mh
+}
+
+func (n *node) InsertRoute(method methodTyp, pattern string, handler http.Handler) *node {
+	var parent *node
+	search := pattern
+
+	for {
+		// Handle key exhaustion
+		if len(search) == 0 {
+			// Insert or update the node's leaf handler
+			n.setEndpoint(method, handler, pattern)
+			return n
+		}
+
+		// We're going to be searching for a wild node next,
+		// in this case, we need to get the tail
+		var label = search[0]
+		var segTail byte
+		var segEndIdx int
+		var segTyp nodeTyp
+		var segRexpat string
+		if label == '{' || label == '*' {
+			segTyp, _, segRexpat, segTail, _, segEndIdx = patNextSegment(search)
+		}
+
+		var prefix string
+		if segTyp == ntRegexp {
+			prefix = segRexpat
+		}
+
+		// Look for the edge to attach to
+		parent = n
+		n = n.getEdge(segTyp, label, segTail, prefix)
+
+		// No edge, create one
+		if n == nil {
+			child := &node{label: label, tail: segTail, prefix: search}
+			hn := parent.addChild(child, search)
+			hn.setEndpoint(method, handler, pattern)
+
+			return hn
+		}
+
+		// Found an edge to match the pattern
+
+		if n.typ > ntStatic {
+			// We found a param node, trim the param from the search path and continue.
+			// This param/wild pattern segment would already be on the tree from a previous
+			// call to addChild when creating a new node.
+			search = search[segEndIdx:]
+			continue
+		}
+
+		// Static nodes fall below here.
+		// Determine longest prefix of the search key on match.
+		commonPrefix := longestPrefix(search, n.prefix)
+		if commonPrefix == len(n.prefix) {
+			// the common prefix is as long as the current node's prefix we're attempting to insert.
+			// keep the search going.
+			search = search[commonPrefix:]
+			continue
+		}
+
+		// Split the node
+		child := &node{
+			typ:    ntStatic,
+			prefix: search[:commonPrefix],
+		}
+		parent.replaceChild(search[0], segTail, child)
+
+		// Restore the existing node
+		n.label = n.prefix[commonPrefix]
+		n.prefix = n.prefix[commonPrefix:]
+		child.addChild(n, n.prefix)
+
+		// If the new key is a subset, set the method/handler on this node and finish.
+		search = search[commonPrefix:]
+		if len(search) == 0 {
+			child.setEndpoint(method, handler, pattern)
+			return child
+		}
+
+		// Create a new edge for the node
+		subchild := &node{
+			typ:    ntStatic,
+			label:  search[0],
+			prefix: search,
+		}
+		hn := child.addChild(subchild, search)
+		hn.setEndpoint(method, handler, pattern)
+		return hn
+	}
+}
+
+// addChild appends the new `child` node to the tree using the `pattern` as the trie key.
+// For a URL router like chi's, we split the static, param, regexp and wildcard segments
+// into different nodes. In addition, addChild will recursively call itself until every
+// pattern segment is added to the url pattern tree as individual nodes, depending on type.
+func (n *node) addChild(child *node, prefix string) *node {
+	search := prefix
+
+	// handler leaf node added to the tree is the child.
+	// this may be overridden later down the flow
+	hn := child
+
+	// Parse next segment
+	segTyp, _, segRexpat, segTail, segStartIdx, segEndIdx := patNextSegment(search)
+
+	// Add child depending on next up segment
+	switch segTyp {
+
+	case ntStatic:
+		// Search prefix is all static (that is, has no params in path)
+		// noop
+
+	default:
+		// Search prefix contains a param, regexp or wildcard
+
+		if segTyp == ntRegexp {
+			rex, err := regexp.Compile(segRexpat)
+			if err != nil {
+				panic(fmt.Sprintf("chi: invalid regexp pattern '%s' in route param", segRexpat))
+			}
+			child.prefix = segRexpat
+			child.rex = rex
+		}
+
+		if segStartIdx == 0 {
+			// Route starts with a param
+			child.typ = segTyp
+
+			if segTyp == ntCatchAll {
+				segStartIdx = -1
+			} else {
+				segStartIdx = segEndIdx
+			}
+			if segStartIdx < 0 {
+				segStartIdx = len(search)
+			}
+			child.tail = segTail // for params, we set the tail
+
+			if segStartIdx != len(search) {
+				// add static edge for the remaining part, split the end.
+				// its not possible to have adjacent param nodes, so its certainly
+				// going to be a static node next.
+
+				search = search[segStartIdx:] // advance search position
+
+				nn := &node{
+					typ:    ntStatic,
+					label:  search[0],
+					prefix: search,
+				}
+				hn = child.addChild(nn, search)
+			}
+
+		} else if segStartIdx > 0 {
+			// Route has some param
+
+			// starts with a static segment
+			child.typ = ntStatic
+			child.prefix = search[:segStartIdx]
+			child.rex = nil
+
+			// add the param edge node
+			search = search[segStartIdx:]
+
+			nn := &node{
+				typ:   segTyp,
+				label: search[0],
+				tail:  segTail,
+			}
+			hn = child.addChild(nn, search)
+
+		}
+	}
+
+	n.children[child.typ] = append(n.children[child.typ], child)
+	n.children[child.typ].Sort()
+	return hn
+}
+
+func (n *node) replaceChild(label, tail byte, child *node) {
+	for i := 0; i < len(n.children[child.typ]); i++ {
+		if n.children[child.typ][i].label == label && n.children[child.typ][i].tail == tail {
+			n.children[child.typ][i] = child
+			n.children[child.typ][i].label = label
+			n.children[child.typ][i].tail = tail
+			return
+		}
+	}
+	panic("chi: replacing missing child")
+}
+
+func (n *node) getEdge(ntyp nodeTyp, label, tail byte, prefix string) *node {
+	nds := n.children[ntyp]
+	for i := 0; i < len(nds); i++ {
+		if nds[i].label == label && nds[i].tail == tail {
+			if ntyp == ntRegexp && nds[i].prefix != prefix {
+				continue
+			}
+			return nds[i]
+		}
+	}
+	return nil
+}
+
+func (n *node) setEndpoint(method methodTyp, handler http.Handler, pattern string) {
+	// Set the handler for the method type on the node
+	if n.endpoints == nil {
+		n.endpoints = make(endpoints)
+	}
+
+	paramKeys := patParamKeys(pattern)
+
+	if method&mSTUB == mSTUB {
+		n.endpoints.Value(mSTUB).handler = handler
+	}
+	if method&mALL == mALL {
+		h := n.endpoints.Value(mALL)
+		h.handler = handler
+		h.pattern = pattern
+		h.paramKeys = paramKeys
+		for _, m := range methodMap {
+			h := n.endpoints.Value(m)
+			h.handler = handler
+			h.pattern = pattern
+			h.paramKeys = paramKeys
+		}
+	} else {
+		h := n.endpoints.Value(method)
+		h.handler = handler
+		h.pattern = pattern
+		h.paramKeys = paramKeys
+	}
+}
+
+func (n *node) FindRoute(rctx *Context, method methodTyp, path string) (*node, endpoints, http.Handler) {
+	// Reset the context routing pattern and params
+	rctx.routePattern = ""
+	rctx.routeParams.Keys = rctx.routeParams.Keys[:0]
+	rctx.routeParams.Values = rctx.routeParams.Values[:0]
+
+	// Find the routing handlers for the path
+	rn := n.findRoute(rctx, method, path)
+	if rn == nil {
+		return nil, nil, nil
+	}
+
+	// Record the routing params in the request lifecycle
+	rctx.URLParams.Keys = append(rctx.URLParams.Keys, rctx.routeParams.Keys...)
+	rctx.URLParams.Values = append(rctx.URLParams.Values, rctx.routeParams.Values...)
+
+	// Record the routing pattern in the request lifecycle
+	if rn.endpoints[method].pattern != "" {
+		rctx.routePattern = rn.endpoints[method].pattern
+		rctx.RoutePatterns = append(rctx.RoutePatterns, rctx.routePattern)
+	}
+
+	return rn, rn.endpoints, rn.endpoints[method].handler
+}
+
+// Recursive edge traversal by checking all nodeTyp groups along the way.
+// It's like searching through a multi-dimensional radix trie.
+func (n *node) findRoute(rctx *Context, method methodTyp, path string) *node {
+	nn := n
+	search := path
+
+	for t, nds := range nn.children {
+		ntyp := nodeTyp(t)
+		if len(nds) == 0 {
+			continue
+		}
+
+		var xn *node
+		xsearch := search
+
+		var label byte
+		if search != "" {
+			label = search[0]
+		}
+
+		switch ntyp {
+		case ntStatic:
+			xn = nds.findEdge(label)
+			if xn == nil || !strings.HasPrefix(xsearch, xn.prefix) {
+				continue
+			}
+			xsearch = xsearch[len(xn.prefix):]
+
+		case ntParam, ntRegexp:
+			// short-circuit and return no matching route for empty param values
+			if xsearch == "" {
+				continue
+			}
+
+			// serially loop through each node grouped by the tail delimiter
+			for idx := 0; idx < len(nds); idx++ {
+				xn = nds[idx]
+
+				// label for param nodes is the delimiter byte
+				p := strings.IndexByte(xsearch, xn.tail)
+
+				if p < 0 {
+					if xn.tail == '/' {
+						p = len(xsearch)
+					} else {
+						continue
+					}
+				} else if ntyp == ntRegexp && p == 0 {
+					continue
+				}
+
+				if ntyp == ntRegexp && xn.rex != nil {
+					if !xn.rex.MatchString(xsearch[:p]) {
+						continue
+					}
+				} else if strings.IndexByte(xsearch[:p], '/') != -1 {
+					// avoid a match across path segments
+					continue
+				}
+
+				prevlen := len(rctx.routeParams.Values)
+				rctx.routeParams.Values = append(rctx.routeParams.Values, xsearch[:p])
+				xsearch = xsearch[p:]
+
+				if len(xsearch) == 0 {
+					if xn.isLeaf() {
+						h := xn.endpoints[method]
+						if h != nil && h.handler != nil {
+							rctx.routeParams.Keys = append(rctx.routeParams.Keys, h.paramKeys...)
+							return xn
+						}
+
+						// flag that the routing context found a route, but not a corresponding
+						// supported method
+						rctx.methodNotAllowed = true
+					}
+				}
+
+				// recursively find the next node on this branch
+				fin := xn.findRoute(rctx, method, xsearch)
+				if fin != nil {
+					return fin
+				}
+
+				// not found on this branch, reset vars
+				rctx.routeParams.Values = rctx.routeParams.Values[:prevlen]
+				xsearch = search
+			}
+
+			rctx.routeParams.Values = append(rctx.routeParams.Values, "")
+
+		default:
+			// catch-all nodes
+			rctx.routeParams.Values = append(rctx.routeParams.Values, search)
+			xn = nds[0]
+			xsearch = ""
+		}
+
+		if xn == nil {
+			continue
+		}
+
+		// did we find it yet?
+		if len(xsearch) == 0 {
+			if xn.isLeaf() {
+				h := xn.endpoints[method]
+				if h != nil && h.handler != nil {
+					rctx.routeParams.Keys = append(rctx.routeParams.Keys, h.paramKeys...)
+					return xn
+				}
+
+				// flag that the routing context found a route, but not a corresponding
+				// supported method
+				rctx.methodNotAllowed = true
+			}
+		}
+
+		// recursively find the next node..
+		fin := xn.findRoute(rctx, method, xsearch)
+		if fin != nil {
+			return fin
+		}
+
+		// Did not find final handler, let's remove the param here if it was set
+		if xn.typ > ntStatic {
+			if len(rctx.routeParams.Values) > 0 {
+				rctx.routeParams.Values = rctx.routeParams.Values[:len(rctx.routeParams.Values)-1]
+			}
+		}
+
+	}
+
+	return nil
+}
+
+func (n *node) findEdge(ntyp nodeTyp, label byte) *node {
+	nds := n.children[ntyp]
+	num := len(nds)
+	idx := 0
+
+	switch ntyp {
+	case ntStatic, ntParam, ntRegexp:
+		i, j := 0, num-1
+		for i <= j {
+			idx = i + (j-i)/2
+			if label > nds[idx].label {
+				i = idx + 1
+			} else if label < nds[idx].label {
+				j = idx - 1
+			} else {
+				i = num // breaks cond
+			}
+		}
+		if nds[idx].label != label {
+			return nil
+		}
+		return nds[idx]
+
+	default: // catch all
+		return nds[idx]
+	}
+}
+
+func (n *node) isLeaf() bool {
+	return n.endpoints != nil
+}
+
+func (n *node) findPattern(pattern string) bool {
+	nn := n
+	for _, nds := range nn.children {
+		if len(nds) == 0 {
+			continue
+		}
+
+		n = nn.findEdge(nds[0].typ, pattern[0])
+		if n == nil {
+			continue
+		}
+
+		var idx int
+		var xpattern string
+
+		switch n.typ {
+		case ntStatic:
+			idx = longestPrefix(pattern, n.prefix)
+			if idx < len(n.prefix) {
+				continue
+			}
+
+		case ntParam, ntRegexp:
+			idx = strings.IndexByte(pattern, '}') + 1
+
+		case ntCatchAll:
+			idx = longestPrefix(pattern, "*")
+
+		default:
+			panic("chi: unknown node type")
+		}
+
+		xpattern = pattern[idx:]
+		if len(xpattern) == 0 {
+			return true
+		}
+
+		return n.findPattern(xpattern)
+	}
+	return false
+}
+
+func (n *node) routes() []Route {
+	rts := []Route{}
+
+	n.walk(func(eps endpoints, subroutes Routes) bool {
+		if eps[mSTUB] != nil && eps[mSTUB].handler != nil && subroutes == nil {
+			return false
+		}
+
+		// Group methodHandlers by unique patterns
+		pats := make(map[string]endpoints)
+
+		for mt, h := range eps {
+			if h.pattern == "" {
+				continue
+			}
+			p, ok := pats[h.pattern]
+			if !ok {
+				p = endpoints{}
+				pats[h.pattern] = p
+			}
+			p[mt] = h
+		}
+
+		for p, mh := range pats {
+			hs := make(map[string]http.Handler)
+			if mh[mALL] != nil && mh[mALL].handler != nil {
+				hs["*"] = mh[mALL].handler
+			}
+
+			for mt, h := range mh {
+				if h.handler == nil {
+					continue
+				}
+				m := methodTypString(mt)
+				if m == "" {
+					continue
+				}
+				hs[m] = h.handler
+			}
+
+			rt := Route{p, hs, subroutes}
+			rts = append(rts, rt)
+		}
+
+		return false
+	})
+
+	return rts
+}
+
+func (n *node) walk(fn func(eps endpoints, subroutes Routes) bool) bool {
+	// Visit the leaf values if any
+	if (n.endpoints != nil || n.subroutes != nil) && fn(n.endpoints, n.subroutes) {
+		return true
+	}
+
+	// Recurse on the children
+	for _, ns := range n.children {
+		for _, cn := range ns {
+			if cn.walk(fn) {
+				return true
+			}
+		}
+	}
+	return false
+}
+
+// patNextSegment returns the next segment details from a pattern:
+// node type, param key, regexp string, param tail byte, param starting index, param ending index
+func patNextSegment(pattern string) (nodeTyp, string, string, byte, int, int) {
+	ps := strings.Index(pattern, "{")
+	ws := strings.Index(pattern, "*")
+
+	if ps < 0 && ws < 0 {
+		return ntStatic, "", "", 0, 0, len(pattern) // we return the entire thing
+	}
+
+	// Sanity check
+	if ps >= 0 && ws >= 0 && ws < ps {
+		panic("chi: wildcard '*' must be the last pattern in a route, otherwise use a '{param}'")
+	}
+
+	var tail byte = '/' // Default endpoint tail to / byte
+
+	if ps >= 0 {
+		// Param/Regexp pattern is next
+		nt := ntParam
+
+		// Read to closing } taking into account opens and closes in curl count (cc)
+		cc := 0
+		pe := ps
+		for i, c := range pattern[ps:] {
+			if c == '{' {
+				cc++
+			} else if c == '}' {
+				cc--
+				if cc == 0 {
+					pe = ps + i
+					break
+				}
+			}
+		}
+		if pe == ps {
+			panic("chi: route param closing delimiter '}' is missing")
+		}
+
+		key := pattern[ps+1 : pe]
+		pe++ // set end to next position
+
+		if pe < len(pattern) {
+			tail = pattern[pe]
+		}
+
+		var rexpat string
+		if idx := strings.Index(key, ":"); idx >= 0 {
+			nt = ntRegexp
+			rexpat = key[idx+1:]
+			key = key[:idx]
+		}
+
+		if len(rexpat) > 0 {
+			if rexpat[0] != '^' {
+				rexpat = "^" + rexpat
+			}
+			if rexpat[len(rexpat)-1] != '$' {
+				rexpat += "$"
+			}
+		}
+
+		return nt, key, rexpat, tail, ps, pe
+	}
+
+	// Wildcard pattern as finale
+	if ws < len(pattern)-1 {
+		panic("chi: wildcard '*' must be the last value in a route. trim trailing text or use a '{param}' instead")
+	}
+	return ntCatchAll, "*", "", 0, ws, len(pattern)
+}
+
+func patParamKeys(pattern string) []string {
+	pat := pattern
+	paramKeys := []string{}
+	for {
+		ptyp, paramKey, _, _, _, e := patNextSegment(pat)
+		if ptyp == ntStatic {
+			return paramKeys
+		}
+		for i := 0; i < len(paramKeys); i++ {
+			if paramKeys[i] == paramKey {
+				panic(fmt.Sprintf("chi: routing pattern '%s' contains duplicate param key, '%s'", pattern, paramKey))
+			}
+		}
+		paramKeys = append(paramKeys, paramKey)
+		pat = pat[e:]
+	}
+}
+
+// longestPrefix finds the length of the shared prefix
+// of two strings
+func longestPrefix(k1, k2 string) int {
+	max := len(k1)
+	if l := len(k2); l < max {
+		max = l
+	}
+	var i int
+	for i = 0; i < max; i++ {
+		if k1[i] != k2[i] {
+			break
+		}
+	}
+	return i
+}
+
+func methodTypString(method methodTyp) string {
+	for s, t := range methodMap {
+		if method == t {
+			return s
+		}
+	}
+	return ""
+}
+
+type nodes []*node
+
+// Sort the list of nodes by label
+func (ns nodes) Sort()              { sort.Sort(ns); ns.tailSort() }
+func (ns nodes) Len() int           { return len(ns) }
+func (ns nodes) Swap(i, j int)      { ns[i], ns[j] = ns[j], ns[i] }
+func (ns nodes) Less(i, j int) bool { return ns[i].label < ns[j].label }
+
+// tailSort pushes nodes with '/' as the tail to the end of the list for param nodes.
+// The list order determines the traversal order.
+func (ns nodes) tailSort() {
+	for i := len(ns) - 1; i >= 0; i-- {
+		if ns[i].typ > ntStatic && ns[i].tail == '/' {
+			ns.Swap(i, len(ns)-1)
+			return
+		}
+	}
+}
+
+func (ns nodes) findEdge(label byte) *node {
+	num := len(ns)
+	idx := 0
+	i, j := 0, num-1
+	for i <= j {
+		idx = i + (j-i)/2
+		if label > ns[idx].label {
+			i = idx + 1
+		} else if label < ns[idx].label {
+			j = idx - 1
+		} else {
+			i = num // breaks cond
+		}
+	}
+	if ns[idx].label != label {
+		return nil
+	}
+	return ns[idx]
+}
+
+// Route describes the details of a routing handler.
+// Handlers map key is an HTTP method
+type Route struct {
+	Pattern   string
+	Handlers  map[string]http.Handler
+	SubRoutes Routes
+}
+
+// WalkFunc is the type of the function called for each method and route visited by Walk.
+type WalkFunc func(method string, route string, handler http.Handler, middlewares ...func(http.Handler) http.Handler) error
+
+// Walk walks any router tree that implements Routes interface.
+func Walk(r Routes, walkFn WalkFunc) error {
+	return walk(r, walkFn, "")
+}
+
+func walk(r Routes, walkFn WalkFunc, parentRoute string, parentMw ...func(http.Handler) http.Handler) error {
+	for _, route := range r.Routes() {
+		mws := make([]func(http.Handler) http.Handler, len(parentMw))
+		copy(mws, parentMw)
+		mws = append(mws, r.Middlewares()...)
+
+		if route.SubRoutes != nil {
+			if err := walk(route.SubRoutes, walkFn, parentRoute+route.Pattern, mws...); err != nil {
+				return err
+			}
+			continue
+		}
+
+		for method, handler := range route.Handlers {
+			if method == "*" {
+				// Ignore a "catchAll" method, since we pass down all the specific methods for each route.
+				continue
+			}
+
+			fullRoute := parentRoute + route.Pattern
+			fullRoute = strings.Replace(fullRoute, "/*/", "/", -1)
+
+			if chain, ok := handler.(*ChainHandler); ok {
+				if err := walkFn(method, fullRoute, chain.Endpoint, append(mws, chain.Middlewares...)...); err != nil {
+					return err
+				}
+			} else {
+				if err := walkFn(method, fullRoute, handler, mws...); err != nil {
+					return err
+				}
+			}
+		}
+	}
+
+	return nil
+}

vendor/github.com/go-chi/cors/LICENSE

@@ -0,0 +1,21 @@
+Copyright (c) 2014 Olivier Poitrey <rs@dailymotion.com>
+Copyright (c) 2016-Present https://github.com/go-chi authors
+
+MIT License
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the "Software"), to deal in
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+the Software, and to permit persons to whom the Software is furnished to do so,
+subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

vendor/github.com/go-chi/cors/README.md

@@ -0,0 +1,39 @@
+# CORS net/http middleware
+
+[go-chi/cors](https://github.com/go-chi/cors) is a fork of [github.com/rs/cors](https://github.com/rs/cors) that
+provides a `net/http` compatible middleware for performing preflight CORS checks on the server side. These headers
+are required for using the browser native [Fetch API](https://developer.mozilla.org/en-US/docs/Web/API/Fetch_API).
+
+This middleware is designed to be used as a top-level middleware on the [chi](https://github.com/go-chi/chi) router.
+Applying with within a `r.Group()` or using `With()` will not work without routes matching `OPTIONS` added.
+
+## Usage
+
+```go
+func main() {
+  r := chi.NewRouter()
+
+  // Basic CORS
+  // for more ideas, see: https://developer.github.com/v3/#cross-origin-resource-sharing
+  r.Use(cors.Handler(cors.Options{
+    // AllowedOrigins:   []string{"https://foo.com"}, // Use this to allow specific origin hosts
+    AllowedOrigins:   []string{"https://*", "http://*"},
+    // AllowOriginFunc:  func(r *http.Request, origin string) bool { return true },
+    AllowedMethods:   []string{"GET", "POST", "PUT", "DELETE", "OPTIONS"},
+    AllowedHeaders:   []string{"Accept", "Authorization", "Content-Type", "X-CSRF-Token"},
+    ExposedHeaders:   []string{"Link"},
+    AllowCredentials: false,
+    MaxAge:           300, // Maximum value not ignored by any of major browsers
+  }))
+
+  r.Get("/", func(w http.ResponseWriter, r *http.Request) {
+    w.Write([]byte("welcome"))
+  })
+
+  http.ListenAndServe(":3000", r)
+}
+```
+
+## Credits
+
+All credit for the original work of this middleware goes out to [github.com/rs](github.com/rs).

vendor/github.com/go-chi/cors/cors.go

@@ -0,0 +1,400 @@
+// cors package is net/http handler to handle CORS related requests
+// as defined by http://www.w3.org/TR/cors/
+//
+// You can configure it by passing an option struct to cors.New:
+//
+//     c := cors.New(cors.Options{
+//         AllowedOrigins: []string{"foo.com"},
+//         AllowedMethods: []string{"GET", "POST", "DELETE"},
+//         AllowCredentials: true,
+//     })
+//
+// Then insert the handler in the chain:
+//
+//     handler = c.Handler(handler)
+//
+// See Options documentation for more options.
+//
+// The resulting handler is a standard net/http handler.
+package cors
+
+import (
+	"log"
+	"net/http"
+	"os"
+	"strconv"
+	"strings"
+)
+
+// Options is a configuration container to setup the CORS middleware.
+type Options struct {
+	// AllowedOrigins is a list of origins a cross-domain request can be executed from.
+	// If the special "*" value is present in the list, all origins will be allowed.
+	// An origin may contain a wildcard (*) to replace 0 or more characters
+	// (i.e.: http://*.domain.com). Usage of wildcards implies a small performance penalty.
+	// Only one wildcard can be used per origin.
+	// Default value is ["*"]
+	AllowedOrigins []string
+
+	// AllowOriginFunc is a custom function to validate the origin. It takes the origin
+	// as argument and returns true if allowed or false otherwise. If this option is
+	// set, the content of AllowedOrigins is ignored.
+	AllowOriginFunc func(r *http.Request, origin string) bool
+
+	// AllowedMethods is a list of methods the client is allowed to use with
+	// cross-domain requests. Default value is simple methods (HEAD, GET and POST).
+	AllowedMethods []string
+
+	// AllowedHeaders is list of non simple headers the client is allowed to use with
+	// cross-domain requests.
+	// If the special "*" value is present in the list, all headers will be allowed.
+	// Default value is [] but "Origin" is always appended to the list.
+	AllowedHeaders []string
+
+	// ExposedHeaders indicates which headers are safe to expose to the API of a CORS
+	// API specification
+	ExposedHeaders []string
+
+	// AllowCredentials indicates whether the request can include user credentials like
+	// cookies, HTTP authentication or client side SSL certificates.
+	AllowCredentials bool
+
+	// MaxAge indicates how long (in seconds) the results of a preflight request
+	// can be cached
+	MaxAge int
+
+	// OptionsPassthrough instructs preflight to let other potential next handlers to
+	// process the OPTIONS method. Turn this on if your application handles OPTIONS.
+	OptionsPassthrough bool
+
+	// Debugging flag adds additional output to debug server side CORS issues
+	Debug bool
+}
+
+// Logger generic interface for logger
+type Logger interface {
+	Printf(string, ...interface{})
+}
+
+// Cors http handler
+type Cors struct {
+	// Debug logger
+	Log Logger
+
+	// Normalized list of plain allowed origins
+	allowedOrigins []string
+
+	// List of allowed origins containing wildcards
+	allowedWOrigins []wildcard
+
+	// Optional origin validator function
+	allowOriginFunc func(r *http.Request, origin string) bool
+
+	// Normalized list of allowed headers
+	allowedHeaders []string
+
+	// Normalized list of allowed methods
+	allowedMethods []string
+
+	// Normalized list of exposed headers
+	exposedHeaders []string
+	maxAge         int
+
+	// Set to true when allowed origins contains a "*"
+	allowedOriginsAll bool
+
+	// Set to true when allowed headers contains a "*"
+	allowedHeadersAll bool
+
+	allowCredentials  bool
+	optionPassthrough bool
+}
+
+// New creates a new Cors handler with the provided options.
+func New(options Options) *Cors {
+	c := &Cors{
+		exposedHeaders:    convert(options.ExposedHeaders, http.CanonicalHeaderKey),
+		allowOriginFunc:   options.AllowOriginFunc,
+		allowCredentials:  options.AllowCredentials,
+		maxAge:            options.MaxAge,
+		optionPassthrough: options.OptionsPassthrough,
+	}
+	if options.Debug && c.Log == nil {
+		c.Log = log.New(os.Stdout, "[cors] ", log.LstdFlags)
+	}
+
+	// Normalize options
+	// Note: for origins and methods matching, the spec requires a case-sensitive matching.
+	// As it may error prone, we chose to ignore the spec here.
+
+	// Allowed Origins
+	if len(options.AllowedOrigins) == 0 {
+		if options.AllowOriginFunc == nil {
+			// Default is all origins
+			c.allowedOriginsAll = true
+		}
+	} else {
+		c.allowedOrigins = []string{}
+		c.allowedWOrigins = []wildcard{}
+		for _, origin := range options.AllowedOrigins {
+			// Normalize
+			origin = strings.ToLower(origin)
+			if origin == "*" {
+				// If "*" is present in the list, turn the whole list into a match all
+				c.allowedOriginsAll = true
+				c.allowedOrigins = nil
+				c.allowedWOrigins = nil
+				break
+			} else if i := strings.IndexByte(origin, '*'); i >= 0 {
+				// Split the origin in two: start and end string without the *
+				w := wildcard{origin[0:i], origin[i+1:]}
+				c.allowedWOrigins = append(c.allowedWOrigins, w)
+			} else {
+				c.allowedOrigins = append(c.allowedOrigins, origin)
+			}
+		}
+	}
+
+	// Allowed Headers
+	if len(options.AllowedHeaders) == 0 {
+		// Use sensible defaults
+		c.allowedHeaders = []string{"Origin", "Accept", "Content-Type"}
+	} else {
+		// Origin is always appended as some browsers will always request for this header at preflight
+		c.allowedHeaders = convert(append(options.AllowedHeaders, "Origin"), http.CanonicalHeaderKey)
+		for _, h := range options.AllowedHeaders {
+			if h == "*" {
+				c.allowedHeadersAll = true
+				c.allowedHeaders = nil
+				break
+			}
+		}
+	}
+
+	// Allowed Methods
+	if len(options.AllowedMethods) == 0 {
+		// Default is spec's "simple" methods
+		c.allowedMethods = []string{http.MethodGet, http.MethodPost, http.MethodHead}
+	} else {
+		c.allowedMethods = convert(options.AllowedMethods, strings.ToUpper)
+	}
+
+	return c
+}
+
+// Handler creates a new Cors handler with passed options.
+func Handler(options Options) func(next http.Handler) http.Handler {
+	c := New(options)
+	return c.Handler
+}
+
+// AllowAll create a new Cors handler with permissive configuration allowing all
+// origins with all standard methods with any header and credentials.
+func AllowAll() *Cors {
+	return New(Options{
+		AllowedOrigins: []string{"*"},
+		AllowedMethods: []string{
+			http.MethodHead,
+			http.MethodGet,
+			http.MethodPost,
+			http.MethodPut,
+			http.MethodPatch,
+			http.MethodDelete,
+		},
+		AllowedHeaders:   []string{"*"},
+		AllowCredentials: false,
+	})
+}
+
+// Handler apply the CORS specification on the request, and add relevant CORS headers
+// as necessary.
+func (c *Cors) Handler(next http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if r.Method == http.MethodOptions && r.Header.Get("Access-Control-Request-Method") != "" {
+			c.logf("Handler: Preflight request")
+			c.handlePreflight(w, r)
+			// Preflight requests are standalone and should stop the chain as some other
+			// middleware may not handle OPTIONS requests correctly. One typical example
+			// is authentication middleware ; OPTIONS requests won't carry authentication
+			// headers (see #1)
+			if c.optionPassthrough {
+				next.ServeHTTP(w, r)
+			} else {
+				w.WriteHeader(http.StatusOK)
+			}
+		} else {
+			c.logf("Handler: Actual request")
+			c.handleActualRequest(w, r)
+			next.ServeHTTP(w, r)
+		}
+	})
+}
+
+// handlePreflight handles pre-flight CORS requests
+func (c *Cors) handlePreflight(w http.ResponseWriter, r *http.Request) {
+	headers := w.Header()
+	origin := r.Header.Get("Origin")
+
+	if r.Method != http.MethodOptions {
+		c.logf("Preflight aborted: %s!=OPTIONS", r.Method)
+		return
+	}
+	// Always set Vary headers
+	// see https://github.com/rs/cors/issues/10,
+	//     https://github.com/rs/cors/commit/dbdca4d95feaa7511a46e6f1efb3b3aa505bc43f#commitcomment-12352001
+	headers.Add("Vary", "Origin")
+	headers.Add("Vary", "Access-Control-Request-Method")
+	headers.Add("Vary", "Access-Control-Request-Headers")
+
+	if origin == "" {
+		c.logf("Preflight aborted: empty origin")
+		return
+	}
+	if !c.isOriginAllowed(r, origin) {
+		c.logf("Preflight aborted: origin '%s' not allowed", origin)
+		return
+	}
+
+	reqMethod := r.Header.Get("Access-Control-Request-Method")
+	if !c.isMethodAllowed(reqMethod) {
+		c.logf("Preflight aborted: method '%s' not allowed", reqMethod)
+		return
+	}
+	reqHeaders := parseHeaderList(r.Header.Get("Access-Control-Request-Headers"))
+	if !c.areHeadersAllowed(reqHeaders) {
+		c.logf("Preflight aborted: headers '%v' not allowed", reqHeaders)
+		return
+	}
+	if c.allowedOriginsAll {
+		headers.Set("Access-Control-Allow-Origin", "*")
+	} else {
+		headers.Set("Access-Control-Allow-Origin", origin)
+	}
+	// Spec says: Since the list of methods can be unbounded, simply returning the method indicated
+	// by Access-Control-Request-Method (if supported) can be enough
+	headers.Set("Access-Control-Allow-Methods", strings.ToUpper(reqMethod))
+	if len(reqHeaders) > 0 {
+
+		// Spec says: Since the list of headers can be unbounded, simply returning supported headers
+		// from Access-Control-Request-Headers can be enough
+		headers.Set("Access-Control-Allow-Headers", strings.Join(reqHeaders, ", "))
+	}
+	if c.allowCredentials {
+		headers.Set("Access-Control-Allow-Credentials", "true")
+	}
+	if c.maxAge > 0 {
+		headers.Set("Access-Control-Max-Age", strconv.Itoa(c.maxAge))
+	}
+	c.logf("Preflight response headers: %v", headers)
+}
+
+// handleActualRequest handles simple cross-origin requests, actual request or redirects
+func (c *Cors) handleActualRequest(w http.ResponseWriter, r *http.Request) {
+	headers := w.Header()
+	origin := r.Header.Get("Origin")
+
+	// Always set Vary, see https://github.com/rs/cors/issues/10
+	headers.Add("Vary", "Origin")
+	if origin == "" {
+		c.logf("Actual request no headers added: missing origin")
+		return
+	}
+	if !c.isOriginAllowed(r, origin) {
+		c.logf("Actual request no headers added: origin '%s' not allowed", origin)
+		return
+	}
+
+	// Note that spec does define a way to specifically disallow a simple method like GET or
+	// POST. Access-Control-Allow-Methods is only used for pre-flight requests and the
+	// spec doesn't instruct to check the allowed methods for simple cross-origin requests.
+	// We think it's a nice feature to be able to have control on those methods though.
+	if !c.isMethodAllowed(r.Method) {
+		c.logf("Actual request no headers added: method '%s' not allowed", r.Method)
+
+		return
+	}
+	if c.allowedOriginsAll {
+		headers.Set("Access-Control-Allow-Origin", "*")
+	} else {
+		headers.Set("Access-Control-Allow-Origin", origin)
+	}
+	if len(c.exposedHeaders) > 0 {
+		headers.Set("Access-Control-Expose-Headers", strings.Join(c.exposedHeaders, ", "))
+	}
+	if c.allowCredentials {
+		headers.Set("Access-Control-Allow-Credentials", "true")
+	}
+	c.logf("Actual response added headers: %v", headers)
+}
+
+// convenience method. checks if a logger is set.
+func (c *Cors) logf(format string, a ...interface{}) {
+	if c.Log != nil {
+		c.Log.Printf(format, a...)
+	}
+}
+
+// isOriginAllowed checks if a given origin is allowed to perform cross-domain requests
+// on the endpoint
+func (c *Cors) isOriginAllowed(r *http.Request, origin string) bool {
+	if c.allowOriginFunc != nil {
+		return c.allowOriginFunc(r, origin)
+	}
+	if c.allowedOriginsAll {
+		return true
+	}
+	origin = strings.ToLower(origin)
+	for _, o := range c.allowedOrigins {
+		if o == origin {
+			return true
+		}
+	}
+	for _, w := range c.allowedWOrigins {
+		if w.match(origin) {
+			return true
+		}
+	}
+	return false
+}
+
+// isMethodAllowed checks if a given method can be used as part of a cross-domain request
+// on the endpoint
+func (c *Cors) isMethodAllowed(method string) bool {
+	if len(c.allowedMethods) == 0 {
+		// If no method allowed, always return false, even for preflight request
+		return false
+	}
+	method = strings.ToUpper(method)
+	if method == http.MethodOptions {
+		// Always allow preflight requests
+		return true
+	}
+	for _, m := range c.allowedMethods {
+		if m == method {
+			return true
+		}
+	}
+	return false
+}
+
+// areHeadersAllowed checks if a given list of headers are allowed to used within
+// a cross-domain request.
+func (c *Cors) areHeadersAllowed(requestedHeaders []string) bool {
+	if c.allowedHeadersAll || len(requestedHeaders) == 0 {
+		return true
+	}
+	for _, header := range requestedHeaders {
+		header = http.CanonicalHeaderKey(header)
+		found := false
+		for _, h := range c.allowedHeaders {
+			if h == header {
+				found = true
+				break
+			}
+		}
+		if !found {
+			return false
+		}
+	}
+	return true
+}

vendor/github.com/go-chi/cors/utils.go

@@ -0,0 +1,70 @@
+package cors
+
+import "strings"
+
+const toLower = 'a' - 'A'
+
+type converter func(string) string
+
+type wildcard struct {
+	prefix string
+	suffix string
+}
+
+func (w wildcard) match(s string) bool {
+	return len(s) >= len(w.prefix+w.suffix) && strings.HasPrefix(s, w.prefix) && strings.HasSuffix(s, w.suffix)
+}
+
+// convert converts a list of string using the passed converter function
+func convert(s []string, c converter) []string {
+	out := []string{}
+	for _, i := range s {
+		out = append(out, c(i))
+	}
+	return out
+}
+
+// parseHeaderList tokenize + normalize a string containing a list of headers
+func parseHeaderList(headerList string) []string {
+	l := len(headerList)
+	h := make([]byte, 0, l)
+	upper := true
+	// Estimate the number headers in order to allocate the right splice size
+	t := 0
+	for i := 0; i < l; i++ {
+		if headerList[i] == ',' {
+			t++
+		}
+	}
+	headers := make([]string, 0, t)
+	for i := 0; i < l; i++ {
+		b := headerList[i]
+		if b >= 'a' && b <= 'z' {
+			if upper {
+				h = append(h, b-toLower)
+			} else {
+				h = append(h, b)
+			}
+		} else if b >= 'A' && b <= 'Z' {
+			if !upper {
+				h = append(h, b+toLower)
+			} else {
+				h = append(h, b)
+			}
+		} else if b == '-' || b == '_' || b == '.' || (b >= '0' && b <= '9') {
+			h = append(h, b)
+		}
+
+		if b == ' ' || b == ',' || i == l-1 {
+			if len(h) > 0 {
+				// Flush the found header
+				headers = append(headers, string(h))
+				h = h[:0]
+				upper = true
+			}
+		} else {
+			upper = b == '-'
+		}
+	}
+	return headers
+}

vendor/github.com/go-sql-driver/mysql/.gitignore

@@ -0,0 +1,9 @@
+.DS_Store
+.DS_Store?
+._*
+.Spotlight-V100
+.Trashes
+Icon?
+ehthumbs.db
+Thumbs.db
+.idea

vendor/github.com/go-sql-driver/mysql/AUTHORS

@@ -0,0 +1,126 @@
+# This is the official list of Go-MySQL-Driver authors for copyright purposes.
+
+# If you are submitting a patch, please add your name or the name of the
+# organization which holds the copyright to this list in alphabetical order.
+
+# Names should be added to this file as
+#	Name <email address>
+# The email address is not required for organizations.
+# Please keep the list sorted.
+
+
+# Individual Persons
+
+Aaron Hopkins <go-sql-driver at die.net>
+Achille Roussel <achille.roussel at gmail.com>
+Alex Snast <alexsn at fb.com>
+Alexey Palazhchenko <alexey.palazhchenko at gmail.com>
+Andrew Reid <andrew.reid at tixtrack.com>
+Animesh Ray <mail.rayanimesh at gmail.com>
+Arne Hormann <arnehormann at gmail.com>
+Ariel Mashraki <ariel at mashraki.co.il>
+Asta Xie <xiemengjun at gmail.com>
+Bulat Gaifullin <gaifullinbf at gmail.com>
+Caine Jette <jette at alum.mit.edu>
+Carlos Nieto <jose.carlos at menteslibres.net>
+Chris Kirkland <chriskirkland at github.com>
+Chris Moos <chris at tech9computers.com>
+Craig Wilson <craiggwilson at gmail.com>
+Daniel Montoya <dsmontoyam at gmail.com>
+Daniel Nichter <nil at codenode.com>
+Daniël van Eeden <git at myname.nl>
+Dave Protasowski <dprotaso at gmail.com>
+DisposaBoy <disposaboy at dby.me>
+Egor Smolyakov <egorsmkv at gmail.com>
+Erwan Martin <hello at erwan.io>
+Evan Shaw <evan at vendhq.com>
+Frederick Mayle <frederickmayle at gmail.com>
+Gustavo Kristic <gkristic at gmail.com>
+Hajime Nakagami <nakagami at gmail.com>
+Hanno Braun <mail at hannobraun.com>
+Henri Yandell <flamefew at gmail.com>
+Hirotaka Yamamoto <ymmt2005 at gmail.com>
+Huyiguang <hyg at webterren.com>
+ICHINOSE Shogo <shogo82148 at gmail.com>
+Ilia Cimpoes <ichimpoesh at gmail.com>
+INADA Naoki <songofacandy at gmail.com>
+Jacek Szwec <szwec.jacek at gmail.com>
+James Harr <james.harr at gmail.com>
+Janek Vedock <janekvedock at comcast.net>
+Jeff Hodges <jeff at somethingsimilar.com>
+Jeffrey Charles <jeffreycharles at gmail.com>
+Jerome Meyer <jxmeyer at gmail.com>
+Jiajia Zhong <zhong2plus at gmail.com>
+Jian Zhen <zhenjl at gmail.com>
+Joshua Prunier <joshua.prunier at gmail.com>
+Julien Lefevre <julien.lefevr at gmail.com>
+Julien Schmidt <go-sql-driver at julienschmidt.com>
+Justin Li <jli at j-li.net>
+Justin Nuß <nuss.justin at gmail.com>
+Kamil Dziedzic <kamil at klecza.pl>
+Kei Kamikawa <x00.x7f.x86 at gmail.com>
+Kevin Malachowski <kevin at chowski.com>
+Kieron Woodhouse <kieron.woodhouse at infosum.com>
+Lance Tian <lance6716 at gmail.com>
+Lennart Rudolph <lrudolph at hmc.edu>
+Leonardo YongUk Kim <dalinaum at gmail.com>
+Linh Tran Tuan <linhduonggnu at gmail.com>
+Lion Yang <lion at aosc.xyz>
+Luca Looz <luca.looz92 at gmail.com>
+Lucas Liu <extrafliu at gmail.com>
+Lunny Xiao <xiaolunwen at gmail.com>
+Luke Scott <luke at webconnex.com>
+Maciej Zimnoch <maciej.zimnoch at codilime.com>
+Michael Woolnough <michael.woolnough at gmail.com>
+Nathanial Murphy <nathanial.murphy at gmail.com>
+Nicola Peduzzi <thenikso at gmail.com>
+Olivier Mengué <dolmen at cpan.org>
+oscarzhao <oscarzhaosl at gmail.com>
+Paul Bonser <misterpib at gmail.com>
+Peter Schultz <peter.schultz at classmarkets.com>
+Phil Porada <philporada at gmail.com>
+Rebecca Chin <rchin at pivotal.io>
+Reed Allman <rdallman10 at gmail.com>
+Richard Wilkes <wilkes at me.com>
+Robert Russell <robert at rrbrussell.com>
+Runrioter Wung <runrioter at gmail.com>
+Samantha Frank <hello at entropy.cat>
+Santhosh Kumar Tekuri <santhosh.tekuri at gmail.com>
+Sho Iizuka <sho.i518 at gmail.com>
+Sho Ikeda <suicaicoca at gmail.com>
+Shuode Li <elemount at qq.com>
+Simon J Mudd <sjmudd at pobox.com>
+Soroush Pour <me at soroushjp.com>
+Stan Putrya <root.vagner at gmail.com>
+Stanley Gunawan <gunawan.stanley at gmail.com>
+Steven Hartland <steven.hartland at multiplay.co.uk>
+Tan Jinhua <312841925 at qq.com>
+Thomas Wodarek <wodarekwebpage at gmail.com>
+Tim Ruffles <timruffles at gmail.com>
+Tom Jenkinson <tom at tjenkinson.me>
+Vladimir Kovpak <cn007b at gmail.com>
+Vladyslav Zhelezniak <zhvladi at gmail.com>
+Xiangyu Hu <xiangyu.hu at outlook.com>
+Xiaobing Jiang <s7v7nislands at gmail.com>
+Xiuming Chen <cc at cxm.cc>
+Xuehong Chan <chanxuehong at gmail.com>
+Zhenye Xie <xiezhenye at gmail.com>
+Zhixin Wen <john.wenzhixin at gmail.com>
+Ziheng Lyu <zihenglv at gmail.com>
+
+# Organizations
+
+Barracuda Networks, Inc.
+Counting Ltd.
+DigitalOcean Inc.
+dyves labs AG
+Facebook Inc.
+GitHub Inc.
+Google Inc.
+InfoSum Ltd.
+Keybase Inc.
+Multiplay Ltd.
+Percona LLC
+Pivotal Inc.
+Stripe Inc.
+Zendesk Inc.

vendor/github.com/go-sql-driver/mysql/CHANGELOG.md

@@ -0,0 +1,266 @@
+## Version 1.7.1 (2023-04-25)
+
+Changes:
+
+  - bump actions/checkout@v3 and actions/setup-go@v3 (#1375)
+  - Add go1.20 and mariadb10.11 to the testing matrix (#1403)
+  - Increase default maxAllowedPacket size. (#1411)
+
+Bugfixes:
+
+  - Use SET syntax as specified in the MySQL documentation (#1402)
+
+
+## Version 1.7 (2022-11-29)
+
+Changes:
+
+  - Drop support of Go 1.12 (#1211)
+  - Refactoring `(*textRows).readRow` in a more clear way (#1230)
+  - util: Reduce boundary check in escape functions. (#1316)
+  - enhancement for mysqlConn handleAuthResult (#1250)
+
+New Features:
+
+  - support Is comparison on MySQLError (#1210)
+  - return unsigned in database type name when necessary (#1238)
+  - Add API to express like a --ssl-mode=PREFERRED MySQL client (#1370)
+  - Add SQLState to MySQLError (#1321)
+
+Bugfixes:
+
+  -  Fix parsing 0 year. (#1257)
+
+
+## Version 1.6 (2021-04-01)
+
+Changes:
+
+  - Migrate the CI service from travis-ci to GitHub Actions (#1176, #1183, #1190)
+  - `NullTime` is deprecated (#960, #1144)
+  - Reduce allocations when building SET command (#1111)
+  - Performance improvement for time formatting (#1118)
+  - Performance improvement for time parsing (#1098, #1113)
+
+New Features:
+
+  - Implement `driver.Validator` interface (#1106, #1174)
+  - Support returning `uint64` from `Valuer` in `ConvertValue` (#1143)
+  - Add `json.RawMessage` for converter and prepared statement (#1059)
+  - Interpolate `json.RawMessage` as `string` (#1058)
+  - Implements `CheckNamedValue` (#1090)
+
+Bugfixes:
+
+  - Stop rounding times (#1121, #1172)
+  - Put zero filler into the SSL handshake packet (#1066)
+  - Fix checking cancelled connections back into the connection pool (#1095)
+  - Fix remove last 0 byte for mysql_old_password when password is empty (#1133)
+
+
+## Version 1.5 (2020-01-07)
+
+Changes:
+
+  - Dropped support Go 1.9 and lower (#823, #829, #886, #1016, #1017)
+  - Improve buffer handling (#890)
+  - Document potentially insecure TLS configs (#901)
+  - Use a double-buffering scheme to prevent data races (#943)
+  - Pass uint64 values without converting them to string (#838, #955)
+  - Update collations and make utf8mb4 default (#877, #1054)
+  - Make NullTime compatible with sql.NullTime in Go 1.13+ (#995)
+  - Removed CloudSQL support (#993, #1007)
+  - Add Go Module support (#1003)
+
+New Features:
+
+  - Implement support of optional TLS (#900)
+  - Check connection liveness (#934, #964, #997, #1048, #1051, #1052)
+  - Implement Connector Interface (#941, #958, #1020, #1035)
+
+Bugfixes:
+
+  - Mark connections as bad on error during ping (#875)
+  - Mark connections as bad on error during dial (#867)
+  - Fix connection leak caused by rapid context cancellation (#1024)
+  - Mark connections as bad on error during Conn.Prepare (#1030)
+
+
+## Version 1.4.1 (2018-11-14)
+
+Bugfixes:
+
+ - Fix TIME format for binary columns (#818)
+ - Fix handling of empty auth plugin names (#835)
+ - Fix caching_sha2_password with empty password (#826)
+ - Fix canceled context broke mysqlConn (#862)
+ - Fix OldAuthSwitchRequest support (#870)
+ - Fix Auth Response packet for cleartext password (#887)
+
+## Version 1.4 (2018-06-03)
+
+Changes:
+
+ - Documentation fixes (#530, #535, #567)
+ - Refactoring (#575, #579, #580, #581, #603, #615, #704)
+ - Cache column names (#444)
+ - Sort the DSN parameters in DSNs generated from a config (#637)
+ - Allow native password authentication by default (#644)
+ - Use the default port if it is missing in the DSN (#668)
+ - Removed the `strict` mode (#676)
+ - Do not query `max_allowed_packet` by default (#680)
+ - Dropped support Go 1.6 and lower (#696)
+ - Updated `ConvertValue()` to match the database/sql/driver implementation (#760)
+ - Document the usage of `0000-00-00T00:00:00` as the time.Time zero value (#783)
+ - Improved the compatibility of the authentication system (#807)
+
+New Features:
+
+ - Multi-Results support (#537)
+ - `rejectReadOnly` DSN option (#604)
+ - `context.Context` support (#608, #612, #627, #761)
+ - Transaction isolation level support (#619, #744)
+ - Read-Only transactions support (#618, #634)
+ - `NewConfig` function which initializes a config with default values (#679)
+ - Implemented the `ColumnType` interfaces (#667, #724)
+ - Support for custom string types in `ConvertValue` (#623)
+ - Implemented `NamedValueChecker`, improving support for uint64 with high bit set (#690, #709, #710)
+ - `caching_sha2_password` authentication plugin support (#794, #800, #801, #802)
+ - Implemented `driver.SessionResetter` (#779)
+ - `sha256_password` authentication plugin support (#808)
+
+Bugfixes:
+
+ - Use the DSN hostname as TLS default ServerName if `tls=true` (#564, #718)
+ - Fixed LOAD LOCAL DATA INFILE for empty files (#590)
+ - Removed columns definition cache since it sometimes cached invalid data (#592)
+ - Don't mutate registered TLS configs (#600)
+ - Make RegisterTLSConfig concurrency-safe (#613)
+ - Handle missing auth data in the handshake packet correctly (#646)
+ - Do not retry queries when data was written to avoid data corruption (#302, #736)
+ - Cache the connection pointer for error handling before invalidating it (#678)
+ - Fixed imports for appengine/cloudsql (#700)
+ - Fix sending STMT_LONG_DATA for 0 byte data (#734)
+ - Set correct capacity for []bytes read from length-encoded strings (#766)
+ - Make RegisterDial concurrency-safe (#773)
+
+
+## Version 1.3 (2016-12-01)
+
+Changes:
+
+ - Go 1.1 is no longer supported
+ - Use decimals fields in MySQL to format time types (#249)
+ - Buffer optimizations (#269)
+ - TLS ServerName defaults to the host (#283)
+ - Refactoring (#400, #410, #437)
+ - Adjusted documentation for second generation CloudSQL (#485)
+ - Documented DSN system var quoting rules (#502)
+ - Made statement.Close() calls idempotent to avoid errors in Go 1.6+ (#512)
+
+New Features:
+
+ - Enable microsecond resolution on TIME, DATETIME and TIMESTAMP (#249)
+ - Support for returning table alias on Columns() (#289, #359, #382)
+ - Placeholder interpolation, can be actived with the DSN parameter `interpolateParams=true` (#309, #318, #490)
+ - Support for uint64 parameters with high bit set (#332, #345)
+ - Cleartext authentication plugin support (#327)
+ - Exported ParseDSN function and the Config struct (#403, #419, #429)
+ - Read / Write timeouts (#401)
+ - Support for JSON field type (#414)
+ - Support for multi-statements and multi-results (#411, #431)
+ - DSN parameter to set the driver-side max_allowed_packet value manually (#489)
+ - Native password authentication plugin support (#494, #524)
+
+Bugfixes:
+
+ - Fixed handling of queries without columns and rows (#255)
+ - Fixed a panic when SetKeepAlive() failed (#298)
+ - Handle ERR packets while reading rows (#321)
+ - Fixed reading NULL length-encoded integers in MySQL 5.6+ (#349)
+ - Fixed absolute paths support in LOAD LOCAL DATA INFILE (#356)
+ - Actually zero out bytes in handshake response (#378)
+ - Fixed race condition in registering LOAD DATA INFILE handler (#383)
+ - Fixed tests with MySQL 5.7.9+ (#380)
+ - QueryUnescape TLS config names (#397)
+ - Fixed "broken pipe" error by writing to closed socket (#390)
+ - Fixed LOAD LOCAL DATA INFILE buffering (#424)
+ - Fixed parsing of floats into float64 when placeholders are used (#434)
+ - Fixed DSN tests with Go 1.7+ (#459)
+ - Handle ERR packets while waiting for EOF (#473)
+ - Invalidate connection on error while discarding additional results (#513)
+ - Allow terminating packets of length 0 (#516)
+
+
+## Version 1.2 (2014-06-03)
+
+Changes:
+
+ - We switched back to a "rolling release". `go get` installs the current master branch again
+ - Version v1 of the driver will not be maintained anymore. Go 1.0 is no longer supported by this driver
+ - Exported errors to allow easy checking from application code
+ - Enabled TCP Keepalives on TCP connections
+ - Optimized INFILE handling (better buffer size calculation, lazy init, ...)
+ - The DSN parser also checks for a missing separating slash
+ - Faster binary date / datetime to string formatting
+ - Also exported the MySQLWarning type
+ - mysqlConn.Close returns the first error encountered instead of ignoring all errors
+ - writePacket() automatically writes the packet size to the header
+ - readPacket() uses an iterative approach instead of the recursive approach to merge splitted packets
+
+New Features:
+
+ - `RegisterDial` allows the usage of a custom dial function to establish the network connection
+ - Setting the connection collation is possible with the `collation` DSN parameter. This parameter should be preferred over the `charset` parameter
+ - Logging of critical errors is configurable with `SetLogger`
+ - Google CloudSQL support
+
+Bugfixes:
+
+ - Allow more than 32 parameters in prepared statements
+ - Various old_password fixes
+ - Fixed TestConcurrent test to pass Go's race detection
+ - Fixed appendLengthEncodedInteger for large numbers
+ - Renamed readLengthEnodedString to readLengthEncodedString and skipLengthEnodedString to skipLengthEncodedString (fixed typo)
+
+
+## Version 1.1 (2013-11-02)
+
+Changes:
+
+  - Go-MySQL-Driver now requires Go 1.1
+  - Connections now use the collation `utf8_general_ci` by default. Adding `&charset=UTF8` to the DSN should not be necessary anymore
+  - Made closing rows and connections error tolerant. This allows for example deferring rows.Close() without checking for errors
+  - `[]byte(nil)` is now treated as a NULL value. Before, it was treated like an empty string / `[]byte("")`
+  - DSN parameter values must now be url.QueryEscape'ed. This allows text values to contain special characters, such as '&'.
+  - Use the IO buffer also for writing. This results in zero allocations (by the driver) for most queries
+  - Optimized the buffer for reading
+  - stmt.Query now caches column metadata
+  - New Logo
+  - Changed the copyright header to include all contributors
+  - Improved the LOAD INFILE documentation
+  - The driver struct is now exported to make the driver directly accessible
+  - Refactored the driver tests
+  - Added more benchmarks and moved all to a separate file
+  - Other small refactoring
+
+New Features:
+
+  - Added *old_passwords* support: Required in some cases, but must be enabled by adding `allowOldPasswords=true` to the DSN since it is insecure
+  - Added a `clientFoundRows` parameter: Return the number of matching rows instead of the number of rows changed on UPDATEs
+  - Added TLS/SSL support: Use a TLS/SSL encrypted connection to the server. Custom TLS configs can be registered and used
+
+Bugfixes:
+
+  - Fixed MySQL 4.1 support: MySQL 4.1 sends packets with lengths which differ from the specification
+  - Convert to DB timezone when inserting `time.Time`
+  - Splitted packets (more than 16MB) are now merged correctly
+  - Fixed false positive `io.EOF` errors when the data was fully read
+  - Avoid panics on reuse of closed connections
+  - Fixed empty string producing false nil values
+  - Fixed sign byte for positive TIME fields
+
+
+## Version 1.0 (2013-05-14)
+
+Initial Release

vendor/github.com/go-sql-driver/mysql/LICENSE

@@ -0,0 +1,373 @@
+Mozilla Public License Version 2.0
+==================================
+
+1. Definitions
+--------------
+
+1.1. "Contributor"
+    means each individual or legal entity that creates, contributes to
+    the creation of, or owns Covered Software.
+
+1.2. "Contributor Version"
+    means the combination of the Contributions of others (if any) used
+    by a Contributor and that particular Contributor's Contribution.
+
+1.3. "Contribution"
+    means Covered Software of a particular Contributor.
+
+1.4. "Covered Software"
+    means Source Code Form to which the initial Contributor has attached
+    the notice in Exhibit A, the Executable Form of such Source Code
+    Form, and Modifications of such Source Code Form, in each case
+    including portions thereof.
+
+1.5. "Incompatible With Secondary Licenses"
+    means
+
+    (a) that the initial Contributor has attached the notice described
+        in Exhibit B to the Covered Software; or
+
+    (b) that the Covered Software was made available under the terms of
+        version 1.1 or earlier of the License, but not also under the
+        terms of a Secondary License.
+
+1.6. "Executable Form"
+    means any form of the work other than Source Code Form.
+
+1.7. "Larger Work"
+    means a work that combines Covered Software with other material, in 
+    a separate file or files, that is not Covered Software.
+
+1.8. "License"
+    means this document.
+
+1.9. "Licensable"
+    means having the right to grant, to the maximum extent possible,
+    whether at the time of the initial grant or subsequently, any and
+    all of the rights conveyed by this License.
+
+1.10. "Modifications"
+    means any of the following:
+
+    (a) any file in Source Code Form that results from an addition to,
+        deletion from, or modification of the contents of Covered
+        Software; or
+
+    (b) any new file in Source Code Form that contains any Covered
+        Software.
+
+1.11. "Patent Claims" of a Contributor
+    means any patent claim(s), including without limitation, method,
+    process, and apparatus claims, in any patent Licensable by such
+    Contributor that would be infringed, but for the grant of the
+    License, by the making, using, selling, offering for sale, having
+    made, import, or transfer of either its Contributions or its
+    Contributor Version.
+
+1.12. "Secondary License"
+    means either the GNU General Public License, Version 2.0, the GNU
+    Lesser General Public License, Version 2.1, the GNU Affero General
+    Public License, Version 3.0, or any later versions of those
+    licenses.
+
+1.13. "Source Code Form"
+    means the form of the work preferred for making modifications.
+
+1.14. "You" (or "Your")
+    means an individual or a legal entity exercising rights under this
+    License. For legal entities, "You" includes any entity that
+    controls, is controlled by, or is under common control with You. For
+    purposes of this definition, "control" means (a) the power, direct
+    or indirect, to cause the direction or management of such entity,
+    whether by contract or otherwise, or (b) ownership of more than
+    fifty percent (50%) of the outstanding shares or beneficial
+    ownership of such entity.
+
+2. License Grants and Conditions
+--------------------------------
+
+2.1. Grants
+
+Each Contributor hereby grants You a world-wide, royalty-free,
+non-exclusive license:
+
+(a) under intellectual property rights (other than patent or trademark)
+    Licensable by such Contributor to use, reproduce, make available,
+    modify, display, perform, distribute, and otherwise exploit its
+    Contributions, either on an unmodified basis, with Modifications, or
+    as part of a Larger Work; and
+
+(b) under Patent Claims of such Contributor to make, use, sell, offer
+    for sale, have made, import, and otherwise transfer either its
+    Contributions or its Contributor Version.
+
+2.2. Effective Date
+
+The licenses granted in Section 2.1 with respect to any Contribution
+become effective for each Contribution on the date the Contributor first
+distributes such Contribution.
+
+2.3. Limitations on Grant Scope
+
+The licenses granted in this Section 2 are the only rights granted under
+this License. No additional rights or licenses will be implied from the
+distribution or licensing of Covered Software under this License.
+Notwithstanding Section 2.1(b) above, no patent license is granted by a
+Contributor:
+
+(a) for any code that a Contributor has removed from Covered Software;
+    or
+
+(b) for infringements caused by: (i) Your and any other third party's
+    modifications of Covered Software, or (ii) the combination of its
+    Contributions with other software (except as part of its Contributor
+    Version); or
+
+(c) under Patent Claims infringed by Covered Software in the absence of
+    its Contributions.
+
+This License does not grant any rights in the trademarks, service marks,
+or logos of any Contributor (except as may be necessary to comply with
+the notice requirements in Section 3.4).
+
+2.4. Subsequent Licenses
+
+No Contributor makes additional grants as a result of Your choice to
+distribute the Covered Software under a subsequent version of this
+License (see Section 10.2) or under the terms of a Secondary License (if
+permitted under the terms of Section 3.3).
+
+2.5. Representation
+
+Each Contributor represents that the Contributor believes its
+Contributions are its original creation(s) or it has sufficient rights
+to grant the rights to its Contributions conveyed by this License.
+
+2.6. Fair Use
+
+This License is not intended to limit any rights You have under
+applicable copyright doctrines of fair use, fair dealing, or other
+equivalents.
+
+2.7. Conditions
+
+Sections 3.1, 3.2, 3.3, and 3.4 are conditions of the licenses granted
+in Section 2.1.
+
+3. Responsibilities
+-------------------
+
+3.1. Distribution of Source Form
+
+All distribution of Covered Software in Source Code Form, including any
+Modifications that You create or to which You contribute, must be under
+the terms of this License. You must inform recipients that the Source
+Code Form of the Covered Software is governed by the terms of this
+License, and how they can obtain a copy of this License. You may not
+attempt to alter or restrict the recipients' rights in the Source Code
+Form.
+
+3.2. Distribution of Executable Form
+
+If You distribute Covered Software in Executable Form then:
+
+(a) such Covered Software must also be made available in Source Code
+    Form, as described in Section 3.1, and You must inform recipients of
+    the Executable Form how they can obtain a copy of such Source Code
+    Form by reasonable means in a timely manner, at a charge no more
+    than the cost of distribution to the recipient; and
+
+(b) You may distribute such Executable Form under the terms of this
+    License, or sublicense it under different terms, provided that the
+    license for the Executable Form does not attempt to limit or alter
+    the recipients' rights in the Source Code Form under this License.
+
+3.3. Distribution of a Larger Work
+
+You may create and distribute a Larger Work under terms of Your choice,
+provided that You also comply with the requirements of this License for
+the Covered Software. If the Larger Work is a combination of Covered
+Software with a work governed by one or more Secondary Licenses, and the
+Covered Software is not Incompatible With Secondary Licenses, this
+License permits You to additionally distribute such Covered Software
+under the terms of such Secondary License(s), so that the recipient of
+the Larger Work may, at their option, further distribute the Covered
+Software under the terms of either this License or such Secondary
+License(s).
+
+3.4. Notices
+
+You may not remove or alter the substance of any license notices
+(including copyright notices, patent notices, disclaimers of warranty,
+or limitations of liability) contained within the Source Code Form of
+the Covered Software, except that You may alter any license notices to
+the extent required to remedy known factual inaccuracies.
+
+3.5. Application of Additional Terms
+
+You may choose to offer, and to charge a fee for, warranty, support,
+indemnity or liability obligations to one or more recipients of Covered
+Software. However, You may do so only on Your own behalf, and not on
+behalf of any Contributor. You must make it absolutely clear that any
+such warranty, support, indemnity, or liability obligation is offered by
+You alone, and You hereby agree to indemnify every Contributor for any
+liability incurred by such Contributor as a result of warranty, support,
+indemnity or liability terms You offer. You may include additional
+disclaimers of warranty and limitations of liability specific to any
+jurisdiction.
+
+4. Inability to Comply Due to Statute or Regulation
+---------------------------------------------------
+
+If it is impossible for You to comply with any of the terms of this
+License with respect to some or all of the Covered Software due to
+statute, judicial order, or regulation then You must: (a) comply with
+the terms of this License to the maximum extent possible; and (b)
+describe the limitations and the code they affect. Such description must
+be placed in a text file included with all distributions of the Covered
+Software under this License. Except to the extent prohibited by statute
+or regulation, such description must be sufficiently detailed for a
+recipient of ordinary skill to be able to understand it.
+
+5. Termination
+--------------
+
+5.1. The rights granted under this License will terminate automatically
+if You fail to comply with any of its terms. However, if You become
+compliant, then the rights granted under this License from a particular
+Contributor are reinstated (a) provisionally, unless and until such
+Contributor explicitly and finally terminates Your grants, and (b) on an
+ongoing basis, if such Contributor fails to notify You of the
+non-compliance by some reasonable means prior to 60 days after You have
+come back into compliance. Moreover, Your grants from a particular
+Contributor are reinstated on an ongoing basis if such Contributor
+notifies You of the non-compliance by some reasonable means, this is the
+first time You have received notice of non-compliance with this License
+from such Contributor, and You become compliant prior to 30 days after
+Your receipt of the notice.
+
+5.2. If You initiate litigation against any entity by asserting a patent
+infringement claim (excluding declaratory judgment actions,
+counter-claims, and cross-claims) alleging that a Contributor Version
+directly or indirectly infringes any patent, then the rights granted to
+You by any and all Contributors for the Covered Software under Section
+2.1 of this License shall terminate.
+
+5.3. In the event of termination under Sections 5.1 or 5.2 above, all
+end user license agreements (excluding distributors and resellers) which
+have been validly granted by You or Your distributors under this License
+prior to termination shall survive termination.
+
+************************************************************************
+*                                                                      *
+*  6. Disclaimer of Warranty                                           *
+*  -------------------------                                           *
+*                                                                      *
+*  Covered Software is provided under this License on an "as is"       *
+*  basis, without warranty of any kind, either expressed, implied, or  *
+*  statutory, including, without limitation, warranties that the       *
+*  Covered Software is free of defects, merchantable, fit for a        *
+*  particular purpose or non-infringing. The entire risk as to the     *
+*  quality and performance of the Covered Software is with You.        *
+*  Should any Covered Software prove defective in any respect, You     *
+*  (not any Contributor) assume the cost of any necessary servicing,   *
+*  repair, or correction. This disclaimer of warranty constitutes an   *
+*  essential part of this License. No use of any Covered Software is   *
+*  authorized under this License except under this disclaimer.         *
+*                                                                      *
+************************************************************************
+
+************************************************************************
+*                                                                      *
+*  7. Limitation of Liability                                          *
+*  --------------------------                                          *
+*                                                                      *
+*  Under no circumstances and under no legal theory, whether tort      *
+*  (including negligence), contract, or otherwise, shall any           *
+*  Contributor, or anyone who distributes Covered Software as          *
+*  permitted above, be liable to You for any direct, indirect,         *
+*  special, incidental, or consequential damages of any character      *
+*  including, without limitation, damages for lost profits, loss of    *
+*  goodwill, work stoppage, computer failure or malfunction, or any    *
+*  and all other commercial damages or losses, even if such party      *
+*  shall have been informed of the possibility of such damages. This   *
+*  limitation of liability shall not apply to liability for death or   *
+*  personal injury resulting from such party's negligence to the       *
+*  extent applicable law prohibits such limitation. Some               *
+*  jurisdictions do not allow the exclusion or limitation of           *
+*  incidental or consequential damages, so this exclusion and          *
+*  limitation may not apply to You.                                    *
+*                                                                      *
+************************************************************************
+
+8. Litigation
+-------------
+
+Any litigation relating to this License may be brought only in the
+courts of a jurisdiction where the defendant maintains its principal
+place of business and such litigation shall be governed by laws of that
+jurisdiction, without reference to its conflict-of-law provisions.
+Nothing in this Section shall prevent a party's ability to bring
+cross-claims or counter-claims.
+
+9. Miscellaneous
+----------------
+
+This License represents the complete agreement concerning the subject
+matter hereof. If any provision of this License is held to be
+unenforceable, such provision shall be reformed only to the extent
+necessary to make it enforceable. Any law or regulation which provides
+that the language of a contract shall be construed against the drafter
+shall not be used to construe this License against a Contributor.
+
+10. Versions of the License
+---------------------------
+
+10.1. New Versions
+
+Mozilla Foundation is the license steward. Except as provided in Section
+10.3, no one other than the license steward has the right to modify or
+publish new versions of this License. Each version will be given a
+distinguishing version number.
+
+10.2. Effect of New Versions
+
+You may distribute the Covered Software under the terms of the version
+of the License under which You originally received the Covered Software,
+or under the terms of any subsequent version published by the license
+steward.
+
+10.3. Modified Versions
+
+If you create software not governed by this License, and you want to
+create a new license for such software, you may create and use a
+modified version of this License if you rename the license and remove
+any references to the name of the license steward (except to note that
+such modified license differs from this License).
+
+10.4. Distributing Source Code Form that is Incompatible With Secondary
+Licenses
+
+If You choose to distribute Source Code Form that is Incompatible With
+Secondary Licenses under the terms of this version of the License, the
+notice described in Exhibit B of this License must be attached.
+
+Exhibit A - Source Code Form License Notice
+-------------------------------------------
+
+  This Source Code Form is subject to the terms of the Mozilla Public
+  License, v. 2.0. If a copy of the MPL was not distributed with this
+  file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+If it is not possible or desirable to put the notice in a particular
+file, then You may include the notice in a location (such as a LICENSE
+file in a relevant directory) where a recipient would be likely to look
+for such a notice.
+
+You may add additional accurate notices of copyright ownership.
+
+Exhibit B - "Incompatible With Secondary Licenses" Notice
+---------------------------------------------------------
+
+  This Source Code Form is "Incompatible With Secondary Licenses", as
+  defined by the Mozilla Public License, v. 2.0.

vendor/github.com/go-sql-driver/mysql/README.md

@@ -0,0 +1,531 @@
+# Go-MySQL-Driver
+
+A MySQL-Driver for Go's [database/sql](https://golang.org/pkg/database/sql/) package
+
+![Go-MySQL-Driver logo](https://raw.github.com/wiki/go-sql-driver/mysql/gomysql_m.png "Golang Gopher holding the MySQL Dolphin")
+
+---------------------------------------
+  * [Features](#features)
+  * [Requirements](#requirements)
+  * [Installation](#installation)
+  * [Usage](#usage)
+    * [DSN (Data Source Name)](#dsn-data-source-name)
+      * [Password](#password)
+      * [Protocol](#protocol)
+      * [Address](#address)
+      * [Parameters](#parameters)
+      * [Examples](#examples)
+    * [Connection pool and timeouts](#connection-pool-and-timeouts)
+    * [context.Context Support](#contextcontext-support)
+    * [ColumnType Support](#columntype-support)
+    * [LOAD DATA LOCAL INFILE support](#load-data-local-infile-support)
+    * [time.Time support](#timetime-support)
+    * [Unicode support](#unicode-support)
+  * [Testing / Development](#testing--development)
+  * [License](#license)
+
+---------------------------------------
+
+## Features
+  * Lightweight and [fast](https://github.com/go-sql-driver/sql-benchmark "golang MySQL-Driver performance")
+  * Native Go implementation. No C-bindings, just pure Go
+  * Connections over TCP/IPv4, TCP/IPv6, Unix domain sockets or [custom protocols](https://godoc.org/github.com/go-sql-driver/mysql#DialFunc)
+  * Automatic handling of broken connections
+  * Automatic Connection Pooling *(by database/sql package)*
+  * Supports queries larger than 16MB
+  * Full [`sql.RawBytes`](https://golang.org/pkg/database/sql/#RawBytes) support.
+  * Intelligent `LONG DATA` handling in prepared statements
+  * Secure `LOAD DATA LOCAL INFILE` support with file allowlisting and `io.Reader` support
+  * Optional `time.Time` parsing
+  * Optional placeholder interpolation
+
+## Requirements
+  * Go 1.13 or higher. We aim to support the 3 latest versions of Go.
+  * MySQL (4.1+), MariaDB, Percona Server, Google CloudSQL or Sphinx (2.2.3+)
+
+---------------------------------------
+
+## Installation
+Simple install the package to your [$GOPATH](https://github.com/golang/go/wiki/GOPATH "GOPATH") with the [go tool](https://golang.org/cmd/go/ "go command") from shell:
+```bash
+$ go get -u github.com/go-sql-driver/mysql
+```
+Make sure [Git is installed](https://git-scm.com/downloads) on your machine and in your system's `PATH`.
+
+## Usage
+_Go MySQL Driver_ is an implementation of Go's `database/sql/driver` interface. You only need to import the driver and can use the full [`database/sql`](https://golang.org/pkg/database/sql/) API then.
+
+Use `mysql` as `driverName` and a valid [DSN](#dsn-data-source-name)  as `dataSourceName`:
+
+```go
+import (
+	"database/sql"
+	"time"
+
+	_ "github.com/go-sql-driver/mysql"
+)
+
+// ...
+
+db, err := sql.Open("mysql", "user:password@/dbname")
+if err != nil {
+	panic(err)
+}
+// See "Important settings" section.
+db.SetConnMaxLifetime(time.Minute * 3)
+db.SetMaxOpenConns(10)
+db.SetMaxIdleConns(10)
+```
+
+[Examples are available in our Wiki](https://github.com/go-sql-driver/mysql/wiki/Examples "Go-MySQL-Driver Examples").
+
+### Important settings
+
+`db.SetConnMaxLifetime()` is required to ensure connections are closed by the driver safely before connection is closed by MySQL server, OS, or other middlewares. Since some middlewares close idle connections by 5 minutes, we recommend timeout shorter than 5 minutes. This setting helps load balancing and changing system variables too.
+
+`db.SetMaxOpenConns()` is highly recommended to limit the number of connection used by the application. There is no recommended limit number because it depends on application and MySQL server.
+
+`db.SetMaxIdleConns()` is recommended to be set same to `db.SetMaxOpenConns()`. When it is smaller than `SetMaxOpenConns()`, connections can be opened and closed much more frequently than you expect. Idle connections can be closed by the `db.SetConnMaxLifetime()`. If you want to close idle connections more rapidly, you can use `db.SetConnMaxIdleTime()` since Go 1.15.
+
+
+### DSN (Data Source Name)
+
+The Data Source Name has a common format, like e.g. [PEAR DB](http://pear.php.net/manual/en/package.database.db.intro-dsn.php) uses it, but without type-prefix (optional parts marked by squared brackets):
+```
+[username[:password]@][protocol[(address)]]/dbname[?param1=value1&...&paramN=valueN]
+```
+
+A DSN in its fullest form:
+```
+username:password@protocol(address)/dbname?param=value
+```
+
+Except for the databasename, all values are optional. So the minimal DSN is:
+```
+/dbname
+```
+
+If you do not want to preselect a database, leave `dbname` empty:
+```
+/
+```
+This has the same effect as an empty DSN string:
+```
+
+```
+
+Alternatively, [Config.FormatDSN](https://godoc.org/github.com/go-sql-driver/mysql#Config.FormatDSN) can be used to create a DSN string by filling a struct.
+
+#### Password
+Passwords can consist of any character. Escaping is **not** necessary.
+
+#### Protocol
+See [net.Dial](https://golang.org/pkg/net/#Dial) for more information which networks are available.
+In general you should use an Unix domain socket if available and TCP otherwise for best performance.
+
+#### Address
+For TCP and UDP networks, addresses have the form `host[:port]`.
+If `port` is omitted, the default port will be used.
+If `host` is a literal IPv6 address, it must be enclosed in square brackets.
+The functions [net.JoinHostPort](https://golang.org/pkg/net/#JoinHostPort) and [net.SplitHostPort](https://golang.org/pkg/net/#SplitHostPort) manipulate addresses in this form.
+
+For Unix domain sockets the address is the absolute path to the MySQL-Server-socket, e.g. `/var/run/mysqld/mysqld.sock` or `/tmp/mysql.sock`.
+
+#### Parameters
+*Parameters are case-sensitive!*
+
+Notice that any of `true`, `TRUE`, `True` or `1` is accepted to stand for a true boolean value. Not surprisingly, false can be specified as any of: `false`, `FALSE`, `False` or `0`.
+
+##### `allowAllFiles`
+
+```
+Type:           bool
+Valid Values:   true, false
+Default:        false
+```
+
+`allowAllFiles=true` disables the file allowlist for `LOAD DATA LOCAL INFILE` and allows *all* files.
+[*Might be insecure!*](http://dev.mysql.com/doc/refman/5.7/en/load-data-local.html)
+
+##### `allowCleartextPasswords`
+
+```
+Type:           bool
+Valid Values:   true, false
+Default:        false
+```
+
+`allowCleartextPasswords=true` allows using the [cleartext client side plugin](https://dev.mysql.com/doc/en/cleartext-pluggable-authentication.html) if required by an account, such as one defined with the [PAM authentication plugin](http://dev.mysql.com/doc/en/pam-authentication-plugin.html). Sending passwords in clear text may be a security problem in some configurations. To avoid problems if there is any possibility that the password would be intercepted, clients should connect to MySQL Server using a method that protects the password. Possibilities include [TLS / SSL](#tls), IPsec, or a private network.
+
+
+##### `allowFallbackToPlaintext`
+
+```
+Type:           bool
+Valid Values:   true, false
+Default:        false
+```
+
+`allowFallbackToPlaintext=true` acts like a `--ssl-mode=PREFERRED` MySQL client as described in [Command Options for Connecting to the Server](https://dev.mysql.com/doc/refman/5.7/en/connection-options.html#option_general_ssl-mode)
+
+##### `allowNativePasswords`
+
+```
+Type:           bool
+Valid Values:   true, false
+Default:        true
+```
+`allowNativePasswords=false` disallows the usage of MySQL native password method.
+
+##### `allowOldPasswords`
+
+```
+Type:           bool
+Valid Values:   true, false
+Default:        false
+```
+`allowOldPasswords=true` allows the usage of the insecure old password method. This should be avoided, but is necessary in some cases. See also [the old_passwords wiki page](https://github.com/go-sql-driver/mysql/wiki/old_passwords).
+
+##### `charset`
+
+```
+Type:           string
+Valid Values:   <name>
+Default:        none
+```
+
+Sets the charset used for client-server interaction (`"SET NAMES <value>"`). If multiple charsets are set (separated by a comma), the following charset is used if setting the charset failes. This enables for example support for `utf8mb4` ([introduced in MySQL 5.5.3](http://dev.mysql.com/doc/refman/5.5/en/charset-unicode-utf8mb4.html)) with fallback to `utf8` for older servers (`charset=utf8mb4,utf8`).
+
+Usage of the `charset` parameter is discouraged because it issues additional queries to the server.
+Unless you need the fallback behavior, please use `collation` instead.
+
+##### `checkConnLiveness`
+
+```
+Type:           bool
+Valid Values:   true, false
+Default:        true
+```
+
+On supported platforms connections retrieved from the connection pool are checked for liveness before using them. If the check fails, the respective connection is marked as bad and the query retried with another connection.
+`checkConnLiveness=false` disables this liveness check of connections.
+
+##### `collation`
+
+```
+Type:           string
+Valid Values:   <name>
+Default:        utf8mb4_general_ci
+```
+
+Sets the collation used for client-server interaction on connection. In contrast to `charset`, `collation` does not issue additional queries. If the specified collation is unavailable on the target server, the connection will fail.
+
+A list of valid charsets for a server is retrievable with `SHOW COLLATION`.
+
+The default collation (`utf8mb4_general_ci`) is supported from MySQL 5.5.  You should use an older collation (e.g. `utf8_general_ci`) for older MySQL.
+
+Collations for charset "ucs2", "utf16", "utf16le", and "utf32" can not be used ([ref](https://dev.mysql.com/doc/refman/5.7/en/charset-connection.html#charset-connection-impermissible-client-charset)).
+
+
+##### `clientFoundRows`
+
+```
+Type:           bool
+Valid Values:   true, false
+Default:        false
+```
+
+`clientFoundRows=true` causes an UPDATE to return the number of matching rows instead of the number of rows changed.
+
+##### `columnsWithAlias`
+
+```
+Type:           bool
+Valid Values:   true, false
+Default:        false
+```
+
+When `columnsWithAlias` is true, calls to `sql.Rows.Columns()` will return the table alias and the column name separated by a dot. For example:
+
+```
+SELECT u.id FROM users as u
+```
+
+will return `u.id` instead of just `id` if `columnsWithAlias=true`.
+
+##### `interpolateParams`
+
+```
+Type:           bool
+Valid Values:   true, false
+Default:        false
+```
+
+If `interpolateParams` is true, placeholders (`?`) in calls to `db.Query()` and `db.Exec()` are interpolated into a single query string with given parameters. This reduces the number of roundtrips, since the driver has to prepare a statement, execute it with given parameters and close the statement again with `interpolateParams=false`.
+
+*This can not be used together with the multibyte encodings BIG5, CP932, GB2312, GBK or SJIS. These are rejected as they may [introduce a SQL injection vulnerability](http://stackoverflow.com/a/12118602/3430118)!*
+
+##### `loc`
+
+```
+Type:           string
+Valid Values:   <escaped name>
+Default:        UTC
+```
+
+Sets the location for time.Time values (when using `parseTime=true`). *"Local"* sets the system's location. See [time.LoadLocation](https://golang.org/pkg/time/#LoadLocation) for details.
+
+Note that this sets the location for time.Time values but does not change MySQL's [time_zone setting](https://dev.mysql.com/doc/refman/5.5/en/time-zone-support.html). For that see the [time_zone system variable](#system-variables), which can also be set as a DSN parameter.
+
+Please keep in mind, that param values must be [url.QueryEscape](https://golang.org/pkg/net/url/#QueryEscape)'ed. Alternatively you can manually replace the `/` with `%2F`. For example `US/Pacific` would be `loc=US%2FPacific`.
+
+##### `maxAllowedPacket`
+```
+Type:          decimal number
+Default:       64*1024*1024
+```
+
+Max packet size allowed in bytes. The default value is 64 MiB and should be adjusted to match the server settings. `maxAllowedPacket=0` can be used to automatically fetch the `max_allowed_packet` variable from server *on every connection*.
+
+##### `multiStatements`
+
+```
+Type:           bool
+Valid Values:   true, false
+Default:        false
+```
+
+Allow multiple statements in one query. While this allows batch queries, it also greatly increases the risk of SQL injections. Only the result of the first query is returned, all other results are silently discarded.
+
+When `multiStatements` is used, `?` parameters must only be used in the first statement.
+
+##### `parseTime`
+
+```
+Type:           bool
+Valid Values:   true, false
+Default:        false
+```
+
+`parseTime=true` changes the output type of `DATE` and `DATETIME` values to `time.Time` instead of `[]byte` / `string`
+The date or datetime like `0000-00-00 00:00:00` is converted into zero value of `time.Time`.
+
+
+##### `readTimeout`
+
+```
+Type:           duration
+Default:        0
+```
+
+I/O read timeout. The value must be a decimal number with a unit suffix (*"ms"*, *"s"*, *"m"*, *"h"*), such as *"30s"*, *"0.5m"* or *"1m30s"*.
+
+##### `rejectReadOnly`
+
+```
+Type:           bool
+Valid Values:   true, false
+Default:        false
+```
+
+
+`rejectReadOnly=true` causes the driver to reject read-only connections. This
+is for a possible race condition during an automatic failover, where the mysql
+client gets connected to a read-only replica after the failover.
+
+Note that this should be a fairly rare case, as an automatic failover normally
+happens when the primary is down, and the race condition shouldn't happen
+unless it comes back up online as soon as the failover is kicked off. On the
+other hand, when this happens, a MySQL application can get stuck on a
+read-only connection until restarted. It is however fairly easy to reproduce,
+for example, using a manual failover on AWS Aurora's MySQL-compatible cluster.
+
+If you are not relying on read-only transactions to reject writes that aren't
+supposed to happen, setting this on some MySQL providers (such as AWS Aurora)
+is safer for failovers.
+
+Note that ERROR 1290 can be returned for a `read-only` server and this option will
+cause a retry for that error. However the same error number is used for some
+other cases. You should ensure your application will never cause an ERROR 1290
+except for `read-only` mode when enabling this option.
+
+
+##### `serverPubKey`
+
+```
+Type:           string
+Valid Values:   <name>
+Default:        none
+```
+
+Server public keys can be registered with [`mysql.RegisterServerPubKey`](https://godoc.org/github.com/go-sql-driver/mysql#RegisterServerPubKey), which can then be used by the assigned name in the DSN.
+Public keys are used to transmit encrypted data, e.g. for authentication.
+If the server's public key is known, it should be set manually to avoid expensive and potentially insecure transmissions of the public key from the server to the client each time it is required.
+
+
+##### `timeout`
+
+```
+Type:           duration
+Default:        OS default
+```
+
+Timeout for establishing connections, aka dial timeout. The value must be a decimal number with a unit suffix (*"ms"*, *"s"*, *"m"*, *"h"*), such as *"30s"*, *"0.5m"* or *"1m30s"*.
+
+
+##### `tls`
+
+```
+Type:           bool / string
+Valid Values:   true, false, skip-verify, preferred, <name>
+Default:        false
+```
+
+`tls=true` enables TLS / SSL encrypted connection to the server. Use `skip-verify` if you want to use a self-signed or invalid certificate (server side) or use `preferred` to use TLS only when advertised by the server. This is similar to `skip-verify`, but additionally allows a fallback to a connection which is not encrypted. Neither `skip-verify` nor `preferred` add any reliable security. You can use a custom TLS config after registering it with [`mysql.RegisterTLSConfig`](https://godoc.org/github.com/go-sql-driver/mysql#RegisterTLSConfig).
+
+
+##### `writeTimeout`
+
+```
+Type:           duration
+Default:        0
+```
+
+I/O write timeout. The value must be a decimal number with a unit suffix (*"ms"*, *"s"*, *"m"*, *"h"*), such as *"30s"*, *"0.5m"* or *"1m30s"*.
+
+
+##### System Variables
+
+Any other parameters are interpreted as system variables:
+  * `<boolean_var>=<value>`: `SET <boolean_var>=<value>`
+  * `<enum_var>=<value>`: `SET <enum_var>=<value>`
+  * `<string_var>=%27<value>%27`: `SET <string_var>='<value>'`
+
+Rules:
+* The values for string variables must be quoted with `'`.
+* The values must also be [url.QueryEscape](http://golang.org/pkg/net/url/#QueryEscape)'ed!
+ (which implies values of string variables must be wrapped with `%27`).
+
+Examples:
+  * `autocommit=1`: `SET autocommit=1`
+  * [`time_zone=%27Europe%2FParis%27`](https://dev.mysql.com/doc/refman/5.5/en/time-zone-support.html): `SET time_zone='Europe/Paris'`
+  * [`transaction_isolation=%27REPEATABLE-READ%27`](https://dev.mysql.com/doc/refman/5.7/en/server-system-variables.html#sysvar_transaction_isolation): `SET transaction_isolation='REPEATABLE-READ'`
+
+
+#### Examples
+```
+user@unix(/path/to/socket)/dbname
+```
+
+```
+root:pw@unix(/tmp/mysql.sock)/myDatabase?loc=Local
+```
+
+```
+user:password@tcp(localhost:5555)/dbname?tls=skip-verify&autocommit=true
+```
+
+Treat warnings as errors by setting the system variable [`sql_mode`](https://dev.mysql.com/doc/refman/5.7/en/sql-mode.html):
+```
+user:password@/dbname?sql_mode=TRADITIONAL
+```
+
+TCP via IPv6:
+```
+user:password@tcp([de:ad:be:ef::ca:fe]:80)/dbname?timeout=90s&collation=utf8mb4_unicode_ci
+```
+
+TCP on a remote host, e.g. Amazon RDS:
+```
+id:password@tcp(your-amazonaws-uri.com:3306)/dbname
+```
+
+Google Cloud SQL on App Engine:
+```
+user:password@unix(/cloudsql/project-id:region-name:instance-name)/dbname
+```
+
+TCP using default port (3306) on localhost:
+```
+user:password@tcp/dbname?charset=utf8mb4,utf8&sys_var=esc%40ped
+```
+
+Use the default protocol (tcp) and host (localhost:3306):
+```
+user:password@/dbname
+```
+
+No Database preselected:
+```
+user:password@/
+```
+
+
+### Connection pool and timeouts
+The connection pool is managed by Go's database/sql package. For details on how to configure the size of the pool and how long connections stay in the pool see `*DB.SetMaxOpenConns`, `*DB.SetMaxIdleConns`, and `*DB.SetConnMaxLifetime` in the [database/sql documentation](https://golang.org/pkg/database/sql/). The read, write, and dial timeouts for each individual connection are configured with the DSN parameters [`readTimeout`](#readtimeout), [`writeTimeout`](#writetimeout), and [`timeout`](#timeout), respectively.
+
+## `ColumnType` Support
+This driver supports the [`ColumnType` interface](https://golang.org/pkg/database/sql/#ColumnType) introduced in Go 1.8, with the exception of [`ColumnType.Length()`](https://golang.org/pkg/database/sql/#ColumnType.Length), which is currently not supported. All Unsigned database type names will be returned `UNSIGNED ` with `INT`, `TINYINT`, `SMALLINT`, `BIGINT`.
+
+## `context.Context` Support
+Go 1.8 added `database/sql` support for `context.Context`. This driver supports query timeouts and cancellation via contexts.
+See [context support in the database/sql package](https://golang.org/doc/go1.8#database_sql) for more details.
+
+
+### `LOAD DATA LOCAL INFILE` support
+For this feature you need direct access to the package. Therefore you must change the import path (no `_`):
+```go
+import "github.com/go-sql-driver/mysql"
+```
+
+Files must be explicitly allowed by registering them with `mysql.RegisterLocalFile(filepath)` (recommended) or the allowlist check must be deactivated by using the DSN parameter `allowAllFiles=true` ([*Might be insecure!*](http://dev.mysql.com/doc/refman/5.7/en/load-data-local.html)).
+
+To use a `io.Reader` a handler function must be registered with `mysql.RegisterReaderHandler(name, handler)` which returns a `io.Reader` or `io.ReadCloser`. The Reader is available with the filepath `Reader::<name>` then. Choose different names for different handlers and `DeregisterReaderHandler` when you don't need it anymore.
+
+See the [godoc of Go-MySQL-Driver](https://godoc.org/github.com/go-sql-driver/mysql "golang mysql driver documentation") for details.
+
+
+### `time.Time` support
+The default internal output type of MySQL `DATE` and `DATETIME` values is `[]byte` which allows you to scan the value into a `[]byte`, `string` or `sql.RawBytes` variable in your program.
+
+However, many want to scan MySQL `DATE` and `DATETIME` values into `time.Time` variables, which is the logical equivalent in Go to `DATE` and `DATETIME` in MySQL. You can do that by changing the internal output type from `[]byte` to `time.Time` with the DSN parameter `parseTime=true`. You can set the default [`time.Time` location](https://golang.org/pkg/time/#Location) with the `loc` DSN parameter.
+
+**Caution:** As of Go 1.1, this makes `time.Time` the only variable type you can scan `DATE` and `DATETIME` values into. This breaks for example [`sql.RawBytes` support](https://github.com/go-sql-driver/mysql/wiki/Examples#rawbytes).
+
+
+### Unicode support
+Since version 1.5 Go-MySQL-Driver automatically uses the collation ` utf8mb4_general_ci` by default.
+
+Other collations / charsets can be set using the [`collation`](#collation) DSN parameter.
+
+Version 1.0 of the driver recommended adding `&charset=utf8` (alias for `SET NAMES utf8`) to the DSN to enable proper UTF-8 support. This is not necessary anymore. The [`collation`](#collation) parameter should be preferred to set another collation / charset than the default.
+
+See http://dev.mysql.com/doc/refman/8.0/en/charset-unicode.html for more details on MySQL's Unicode support.
+
+## Testing / Development
+To run the driver tests you may need to adjust the configuration. See the [Testing Wiki-Page](https://github.com/go-sql-driver/mysql/wiki/Testing "Testing") for details.
+
+Go-MySQL-Driver is not feature-complete yet. Your help is very appreciated.
+If you want to contribute, you can work on an [open issue](https://github.com/go-sql-driver/mysql/issues?state=open) or review a [pull request](https://github.com/go-sql-driver/mysql/pulls).
+
+See the [Contribution Guidelines](https://github.com/go-sql-driver/mysql/blob/master/.github/CONTRIBUTING.md) for details.
+
+---------------------------------------
+
+## License
+Go-MySQL-Driver is licensed under the [Mozilla Public License Version 2.0](https://raw.github.com/go-sql-driver/mysql/master/LICENSE)
+
+Mozilla summarizes the license scope as follows:
+> MPL: The copyleft applies to any files containing MPLed code.
+
+
+That means:
+  * You can **use** the **unchanged** source code both in private and commercially.
+  * When distributing, you **must publish** the source code of any **changed files** licensed under the MPL 2.0 under a) the MPL 2.0 itself or b) a compatible license (e.g. GPL 3.0 or Apache License 2.0).
+  * You **needn't publish** the source code of your library as long as the files licensed under the MPL 2.0 are **unchanged**.
+
+Please read the [MPL 2.0 FAQ](https://www.mozilla.org/en-US/MPL/2.0/FAQ/) if you have further questions regarding the license.
+
+You can read the full terms here: [LICENSE](https://raw.github.com/go-sql-driver/mysql/master/LICENSE).
+
+![Go Gopher and MySQL Dolphin](https://raw.github.com/wiki/go-sql-driver/mysql/go-mysql-driver_m.jpg "Golang Gopher transporting the MySQL Dolphin in a wheelbarrow")

vendor/github.com/go-sql-driver/mysql/atomic_bool.go

@@ -0,0 +1,19 @@
+// Go MySQL Driver - A MySQL-Driver for Go's database/sql package.
+//
+// Copyright 2022 The Go-MySQL-Driver Authors. All rights reserved.
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this file,
+// You can obtain one at http://mozilla.org/MPL/2.0/.
+//go:build go1.19
+// +build go1.19
+
+package mysql
+
+import "sync/atomic"
+
+/******************************************************************************
+*                               Sync utils                                    *
+******************************************************************************/
+
+type atomicBool = atomic.Bool

vendor/github.com/go-sql-driver/mysql/atomic_bool_go118.go

@@ -0,0 +1,47 @@
+// Go MySQL Driver - A MySQL-Driver for Go's database/sql package.
+//
+// Copyright 2022 The Go-MySQL-Driver Authors. All rights reserved.
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this file,
+// You can obtain one at http://mozilla.org/MPL/2.0/.
+//go:build !go1.19
+// +build !go1.19
+
+package mysql
+
+import "sync/atomic"
+
+/******************************************************************************
+*                               Sync utils                                    *
+******************************************************************************/
+
+// atomicBool is an implementation of atomic.Bool for older version of Go.
+// it is a wrapper around uint32 for usage as a boolean value with
+// atomic access.
+type atomicBool struct {
+	_     noCopy
+	value uint32
+}
+
+// Load returns whether the current boolean value is true
+func (ab *atomicBool) Load() bool {
+	return atomic.LoadUint32(&ab.value) > 0
+}
+
+// Store sets the value of the bool regardless of the previous value
+func (ab *atomicBool) Store(value bool) {
+	if value {
+		atomic.StoreUint32(&ab.value, 1)
+	} else {
+		atomic.StoreUint32(&ab.value, 0)
+	}
+}
+
+// Swap sets the value of the bool and returns the old value.
+func (ab *atomicBool) Swap(value bool) bool {
+	if value {
+		return atomic.SwapUint32(&ab.value, 1) > 0
+	}
+	return atomic.SwapUint32(&ab.value, 0) > 0
+}

vendor/github.com/go-sql-driver/mysql/auth.go

@@ -0,0 +1,437 @@
+// Go MySQL Driver - A MySQL-Driver for Go's database/sql package
+//
+// Copyright 2018 The Go-MySQL-Driver Authors. All rights reserved.
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this file,
+// You can obtain one at http://mozilla.org/MPL/2.0/.
+
+package mysql
+
+import (
+	"crypto/rand"
+	"crypto/rsa"
+	"crypto/sha1"
+	"crypto/sha256"
+	"crypto/x509"
+	"encoding/pem"
+	"fmt"
+	"sync"
+)
+
+// server pub keys registry
+var (
+	serverPubKeyLock     sync.RWMutex
+	serverPubKeyRegistry map[string]*rsa.PublicKey
+)
+
+// RegisterServerPubKey registers a server RSA public key which can be used to
+// send data in a secure manner to the server without receiving the public key
+// in a potentially insecure way from the server first.
+// Registered keys can afterwards be used adding serverPubKey=<name> to the DSN.
+//
+// Note: The provided rsa.PublicKey instance is exclusively owned by the driver
+// after registering it and may not be modified.
+//
+//	data, err := ioutil.ReadFile("mykey.pem")
+//	if err != nil {
+//		log.Fatal(err)
+//	}
+//
+//	block, _ := pem.Decode(data)
+//	if block == nil || block.Type != "PUBLIC KEY" {
+//		log.Fatal("failed to decode PEM block containing public key")
+//	}
+//
+//	pub, err := x509.ParsePKIXPublicKey(block.Bytes)
+//	if err != nil {
+//		log.Fatal(err)
+//	}
+//
+//	if rsaPubKey, ok := pub.(*rsa.PublicKey); ok {
+//		mysql.RegisterServerPubKey("mykey", rsaPubKey)
+//	} else {
+//		log.Fatal("not a RSA public key")
+//	}
+func RegisterServerPubKey(name string, pubKey *rsa.PublicKey) {
+	serverPubKeyLock.Lock()
+	if serverPubKeyRegistry == nil {
+		serverPubKeyRegistry = make(map[string]*rsa.PublicKey)
+	}
+
+	serverPubKeyRegistry[name] = pubKey
+	serverPubKeyLock.Unlock()
+}
+
+// DeregisterServerPubKey removes the public key registered with the given name.
+func DeregisterServerPubKey(name string) {
+	serverPubKeyLock.Lock()
+	if serverPubKeyRegistry != nil {
+		delete(serverPubKeyRegistry, name)
+	}
+	serverPubKeyLock.Unlock()
+}
+
+func getServerPubKey(name string) (pubKey *rsa.PublicKey) {
+	serverPubKeyLock.RLock()
+	if v, ok := serverPubKeyRegistry[name]; ok {
+		pubKey = v
+	}
+	serverPubKeyLock.RUnlock()
+	return
+}
+
+// Hash password using pre 4.1 (old password) method
+// https://github.com/atcurtis/mariadb/blob/master/mysys/my_rnd.c
+type myRnd struct {
+	seed1, seed2 uint32
+}
+
+const myRndMaxVal = 0x3FFFFFFF
+
+// Pseudo random number generator
+func newMyRnd(seed1, seed2 uint32) *myRnd {
+	return &myRnd{
+		seed1: seed1 % myRndMaxVal,
+		seed2: seed2 % myRndMaxVal,
+	}
+}
+
+// Tested to be equivalent to MariaDB's floating point variant
+// http://play.golang.org/p/QHvhd4qved
+// http://play.golang.org/p/RG0q4ElWDx
+func (r *myRnd) NextByte() byte {
+	r.seed1 = (r.seed1*3 + r.seed2) % myRndMaxVal
+	r.seed2 = (r.seed1 + r.seed2 + 33) % myRndMaxVal
+
+	return byte(uint64(r.seed1) * 31 / myRndMaxVal)
+}
+
+// Generate binary hash from byte string using insecure pre 4.1 method
+func pwHash(password []byte) (result [2]uint32) {
+	var add uint32 = 7
+	var tmp uint32
+
+	result[0] = 1345345333
+	result[1] = 0x12345671
+
+	for _, c := range password {
+		// skip spaces and tabs in password
+		if c == ' ' || c == '\t' {
+			continue
+		}
+
+		tmp = uint32(c)
+		result[0] ^= (((result[0] & 63) + add) * tmp) + (result[0] << 8)
+		result[1] += (result[1] << 8) ^ result[0]
+		add += tmp
+	}
+
+	// Remove sign bit (1<<31)-1)
+	result[0] &= 0x7FFFFFFF
+	result[1] &= 0x7FFFFFFF
+
+	return
+}
+
+// Hash password using insecure pre 4.1 method
+func scrambleOldPassword(scramble []byte, password string) []byte {
+	scramble = scramble[:8]
+
+	hashPw := pwHash([]byte(password))
+	hashSc := pwHash(scramble)
+
+	r := newMyRnd(hashPw[0]^hashSc[0], hashPw[1]^hashSc[1])
+
+	var out [8]byte
+	for i := range out {
+		out[i] = r.NextByte() + 64
+	}
+
+	mask := r.NextByte()
+	for i := range out {
+		out[i] ^= mask
+	}
+
+	return out[:]
+}
+
+// Hash password using 4.1+ method (SHA1)
+func scramblePassword(scramble []byte, password string) []byte {
+	if len(password) == 0 {
+		return nil
+	}
+
+	// stage1Hash = SHA1(password)
+	crypt := sha1.New()
+	crypt.Write([]byte(password))
+	stage1 := crypt.Sum(nil)
+
+	// scrambleHash = SHA1(scramble + SHA1(stage1Hash))
+	// inner Hash
+	crypt.Reset()
+	crypt.Write(stage1)
+	hash := crypt.Sum(nil)
+
+	// outer Hash
+	crypt.Reset()
+	crypt.Write(scramble)
+	crypt.Write(hash)
+	scramble = crypt.Sum(nil)
+
+	// token = scrambleHash XOR stage1Hash
+	for i := range scramble {
+		scramble[i] ^= stage1[i]
+	}
+	return scramble
+}
+
+// Hash password using MySQL 8+ method (SHA256)
+func scrambleSHA256Password(scramble []byte, password string) []byte {
+	if len(password) == 0 {
+		return nil
+	}
+
+	// XOR(SHA256(password), SHA256(SHA256(SHA256(password)), scramble))
+
+	crypt := sha256.New()
+	crypt.Write([]byte(password))
+	message1 := crypt.Sum(nil)
+
+	crypt.Reset()
+	crypt.Write(message1)
+	message1Hash := crypt.Sum(nil)
+
+	crypt.Reset()
+	crypt.Write(message1Hash)
+	crypt.Write(scramble)
+	message2 := crypt.Sum(nil)
+
+	for i := range message1 {
+		message1[i] ^= message2[i]
+	}
+
+	return message1
+}
+
+func encryptPassword(password string, seed []byte, pub *rsa.PublicKey) ([]byte, error) {
+	plain := make([]byte, len(password)+1)
+	copy(plain, password)
+	for i := range plain {
+		j := i % len(seed)
+		plain[i] ^= seed[j]
+	}
+	sha1 := sha1.New()
+	return rsa.EncryptOAEP(sha1, rand.Reader, pub, plain, nil)
+}
+
+func (mc *mysqlConn) sendEncryptedPassword(seed []byte, pub *rsa.PublicKey) error {
+	enc, err := encryptPassword(mc.cfg.Passwd, seed, pub)
+	if err != nil {
+		return err
+	}
+	return mc.writeAuthSwitchPacket(enc)
+}
+
+func (mc *mysqlConn) auth(authData []byte, plugin string) ([]byte, error) {
+	switch plugin {
+	case "caching_sha2_password":
+		authResp := scrambleSHA256Password(authData, mc.cfg.Passwd)
+		return authResp, nil
+
+	case "mysql_old_password":
+		if !mc.cfg.AllowOldPasswords {
+			return nil, ErrOldPassword
+		}
+		if len(mc.cfg.Passwd) == 0 {
+			return nil, nil
+		}
+		// Note: there are edge cases where this should work but doesn't;
+		// this is currently "wontfix":
+		// https://github.com/go-sql-driver/mysql/issues/184
+		authResp := append(scrambleOldPassword(authData[:8], mc.cfg.Passwd), 0)
+		return authResp, nil
+
+	case "mysql_clear_password":
+		if !mc.cfg.AllowCleartextPasswords {
+			return nil, ErrCleartextPassword
+		}
+		// http://dev.mysql.com/doc/refman/5.7/en/cleartext-authentication-plugin.html
+		// http://dev.mysql.com/doc/refman/5.7/en/pam-authentication-plugin.html
+		return append([]byte(mc.cfg.Passwd), 0), nil
+
+	case "mysql_native_password":
+		if !mc.cfg.AllowNativePasswords {
+			return nil, ErrNativePassword
+		}
+		// https://dev.mysql.com/doc/internals/en/secure-password-authentication.html
+		// Native password authentication only need and will need 20-byte challenge.
+		authResp := scramblePassword(authData[:20], mc.cfg.Passwd)
+		return authResp, nil
+
+	case "sha256_password":
+		if len(mc.cfg.Passwd) == 0 {
+			return []byte{0}, nil
+		}
+		// unlike caching_sha2_password, sha256_password does not accept
+		// cleartext password on unix transport.
+		if mc.cfg.TLS != nil {
+			// write cleartext auth packet
+			return append([]byte(mc.cfg.Passwd), 0), nil
+		}
+
+		pubKey := mc.cfg.pubKey
+		if pubKey == nil {
+			// request public key from server
+			return []byte{1}, nil
+		}
+
+		// encrypted password
+		enc, err := encryptPassword(mc.cfg.Passwd, authData, pubKey)
+		return enc, err
+
+	default:
+		errLog.Print("unknown auth plugin:", plugin)
+		return nil, ErrUnknownPlugin
+	}
+}
+
+func (mc *mysqlConn) handleAuthResult(oldAuthData []byte, plugin string) error {
+	// Read Result Packet
+	authData, newPlugin, err := mc.readAuthResult()
+	if err != nil {
+		return err
+	}
+
+	// handle auth plugin switch, if requested
+	if newPlugin != "" {
+		// If CLIENT_PLUGIN_AUTH capability is not supported, no new cipher is
+		// sent and we have to keep using the cipher sent in the init packet.
+		if authData == nil {
+			authData = oldAuthData
+		} else {
+			// copy data from read buffer to owned slice
+			copy(oldAuthData, authData)
+		}
+
+		plugin = newPlugin
+
+		authResp, err := mc.auth(authData, plugin)
+		if err != nil {
+			return err
+		}
+		if err = mc.writeAuthSwitchPacket(authResp); err != nil {
+			return err
+		}
+
+		// Read Result Packet
+		authData, newPlugin, err = mc.readAuthResult()
+		if err != nil {
+			return err
+		}
+
+		// Do not allow to change the auth plugin more than once
+		if newPlugin != "" {
+			return ErrMalformPkt
+		}
+	}
+
+	switch plugin {
+
+	// https://insidemysql.com/preparing-your-community-connector-for-mysql-8-part-2-sha256/
+	case "caching_sha2_password":
+		switch len(authData) {
+		case 0:
+			return nil // auth successful
+		case 1:
+			switch authData[0] {
+			case cachingSha2PasswordFastAuthSuccess:
+				if err = mc.readResultOK(); err == nil {
+					return nil // auth successful
+				}
+
+			case cachingSha2PasswordPerformFullAuthentication:
+				if mc.cfg.TLS != nil || mc.cfg.Net == "unix" {
+					// write cleartext auth packet
+					err = mc.writeAuthSwitchPacket(append([]byte(mc.cfg.Passwd), 0))
+					if err != nil {
+						return err
+					}
+				} else {
+					pubKey := mc.cfg.pubKey
+					if pubKey == nil {
+						// request public key from server
+						data, err := mc.buf.takeSmallBuffer(4 + 1)
+						if err != nil {
+							return err
+						}
+						data[4] = cachingSha2PasswordRequestPublicKey
+						err = mc.writePacket(data)
+						if err != nil {
+							return err
+						}
+
+						if data, err = mc.readPacket(); err != nil {
+							return err
+						}
+
+						if data[0] != iAuthMoreData {
+							return fmt.Errorf("unexpect resp from server for caching_sha2_password perform full authentication")
+						}
+
+						// parse public key
+						block, rest := pem.Decode(data[1:])
+						if block == nil {
+							return fmt.Errorf("No Pem data found, data: %s", rest)
+						}
+						pkix, err := x509.ParsePKIXPublicKey(block.Bytes)
+						if err != nil {
+							return err
+						}
+						pubKey = pkix.(*rsa.PublicKey)
+					}
+
+					// send encrypted password
+					err = mc.sendEncryptedPassword(oldAuthData, pubKey)
+					if err != nil {
+						return err
+					}
+				}
+				return mc.readResultOK()
+
+			default:
+				return ErrMalformPkt
+			}
+		default:
+			return ErrMalformPkt
+		}
+
+	case "sha256_password":
+		switch len(authData) {
+		case 0:
+			return nil // auth successful
+		default:
+			block, _ := pem.Decode(authData)
+			if block == nil {
+				return fmt.Errorf("no Pem data found, data: %s", authData)
+			}
+
+			pub, err := x509.ParsePKIXPublicKey(block.Bytes)
+			if err != nil {
+				return err
+			}
+
+			// send encrypted password
+			err = mc.sendEncryptedPassword(oldAuthData, pub.(*rsa.PublicKey))
+			if err != nil {
+				return err
+			}
+			return mc.readResultOK()
+		}
+
+	default:
+		return nil // auth successful
+	}
+
+	return err
+}

vendor/github.com/go-sql-driver/mysql/buffer.go

@@ -0,0 +1,182 @@
+// Go MySQL Driver - A MySQL-Driver for Go's database/sql package
+//
+// Copyright 2013 The Go-MySQL-Driver Authors. All rights reserved.
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this file,
+// You can obtain one at http://mozilla.org/MPL/2.0/.
+
+package mysql
+
+import (
+	"io"
+	"net"
+	"time"
+)
+
+const defaultBufSize = 4096
+const maxCachedBufSize = 256 * 1024
+
+// A buffer which is used for both reading and writing.
+// This is possible since communication on each connection is synchronous.
+// In other words, we can't write and read simultaneously on the same connection.
+// The buffer is similar to bufio.Reader / Writer but zero-copy-ish
+// Also highly optimized for this particular use case.
+// This buffer is backed by two byte slices in a double-buffering scheme
+type buffer struct {
+	buf     []byte // buf is a byte buffer who's length and capacity are equal.
+	nc      net.Conn
+	idx     int
+	length  int
+	timeout time.Duration
+	dbuf    [2][]byte // dbuf is an array with the two byte slices that back this buffer
+	flipcnt uint      // flipccnt is the current buffer counter for double-buffering
+}
+
+// newBuffer allocates and returns a new buffer.
+func newBuffer(nc net.Conn) buffer {
+	fg := make([]byte, defaultBufSize)
+	return buffer{
+		buf:  fg,
+		nc:   nc,
+		dbuf: [2][]byte{fg, nil},
+	}
+}
+
+// flip replaces the active buffer with the background buffer
+// this is a delayed flip that simply increases the buffer counter;
+// the actual flip will be performed the next time we call `buffer.fill`
+func (b *buffer) flip() {
+	b.flipcnt += 1
+}
+
+// fill reads into the buffer until at least _need_ bytes are in it
+func (b *buffer) fill(need int) error {
+	n := b.length
+	// fill data into its double-buffering target: if we've called
+	// flip on this buffer, we'll be copying to the background buffer,
+	// and then filling it with network data; otherwise we'll just move
+	// the contents of the current buffer to the front before filling it
+	dest := b.dbuf[b.flipcnt&1]
+
+	// grow buffer if necessary to fit the whole packet.
+	if need > len(dest) {
+		// Round up to the next multiple of the default size
+		dest = make([]byte, ((need/defaultBufSize)+1)*defaultBufSize)
+
+		// if the allocated buffer is not too large, move it to backing storage
+		// to prevent extra allocations on applications that perform large reads
+		if len(dest) <= maxCachedBufSize {
+			b.dbuf[b.flipcnt&1] = dest
+		}
+	}
+
+	// if we're filling the fg buffer, move the existing data to the start of it.
+	// if we're filling the bg buffer, copy over the data
+	if n > 0 {
+		copy(dest[:n], b.buf[b.idx:])
+	}
+
+	b.buf = dest
+	b.idx = 0
+
+	for {
+		if b.timeout > 0 {
+			if err := b.nc.SetReadDeadline(time.Now().Add(b.timeout)); err != nil {
+				return err
+			}
+		}
+
+		nn, err := b.nc.Read(b.buf[n:])
+		n += nn
+
+		switch err {
+		case nil:
+			if n < need {
+				continue
+			}
+			b.length = n
+			return nil
+
+		case io.EOF:
+			if n >= need {
+				b.length = n
+				return nil
+			}
+			return io.ErrUnexpectedEOF
+
+		default:
+			return err
+		}
+	}
+}
+
+// returns next N bytes from buffer.
+// The returned slice is only guaranteed to be valid until the next read
+func (b *buffer) readNext(need int) ([]byte, error) {
+	if b.length < need {
+		// refill
+		if err := b.fill(need); err != nil {
+			return nil, err
+		}
+	}
+
+	offset := b.idx
+	b.idx += need
+	b.length -= need
+	return b.buf[offset:b.idx], nil
+}
+
+// takeBuffer returns a buffer with the requested size.
+// If possible, a slice from the existing buffer is returned.
+// Otherwise a bigger buffer is made.
+// Only one buffer (total) can be used at a time.
+func (b *buffer) takeBuffer(length int) ([]byte, error) {
+	if b.length > 0 {
+		return nil, ErrBusyBuffer
+	}
+
+	// test (cheap) general case first
+	if length <= cap(b.buf) {
+		return b.buf[:length], nil
+	}
+
+	if length < maxPacketSize {
+		b.buf = make([]byte, length)
+		return b.buf, nil
+	}
+
+	// buffer is larger than we want to store.
+	return make([]byte, length), nil
+}
+
+// takeSmallBuffer is shortcut which can be used if length is
+// known to be smaller than defaultBufSize.
+// Only one buffer (total) can be used at a time.
+func (b *buffer) takeSmallBuffer(length int) ([]byte, error) {
+	if b.length > 0 {
+		return nil, ErrBusyBuffer
+	}
+	return b.buf[:length], nil
+}
+
+// takeCompleteBuffer returns the complete existing buffer.
+// This can be used if the necessary buffer size is unknown.
+// cap and len of the returned buffer will be equal.
+// Only one buffer (total) can be used at a time.
+func (b *buffer) takeCompleteBuffer() ([]byte, error) {
+	if b.length > 0 {
+		return nil, ErrBusyBuffer
+	}
+	return b.buf, nil
+}
+
+// store stores buf, an updated buffer, if its suitable to do so.
+func (b *buffer) store(buf []byte) error {
+	if b.length > 0 {
+		return ErrBusyBuffer
+	} else if cap(buf) <= maxPacketSize && cap(buf) > cap(b.buf) {
+		b.buf = buf[:cap(buf)]
+	}
+	return nil
+}

vendor/github.com/go-sql-driver/mysql/collations.go

@@ -0,0 +1,266 @@
+// Go MySQL Driver - A MySQL-Driver for Go's database/sql package
+//
+// Copyright 2014 The Go-MySQL-Driver Authors. All rights reserved.
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this file,
+// You can obtain one at http://mozilla.org/MPL/2.0/.
+
+package mysql
+
+const defaultCollation = "utf8mb4_general_ci"
+const binaryCollation = "binary"
+
+// A list of available collations mapped to the internal ID.
+// To update this map use the following MySQL query:
+//
+//	SELECT COLLATION_NAME, ID FROM information_schema.COLLATIONS WHERE ID<256 ORDER BY ID
+//
+// Handshake packet have only 1 byte for collation_id.  So we can't use collations with ID > 255.
+//
+// ucs2, utf16, and utf32 can't be used for connection charset.
+// https://dev.mysql.com/doc/refman/5.7/en/charset-connection.html#charset-connection-impermissible-client-charset
+// They are commented out to reduce this map.
+var collations = map[string]byte{
+	"big5_chinese_ci":      1,
+	"latin2_czech_cs":      2,
+	"dec8_swedish_ci":      3,
+	"cp850_general_ci":     4,
+	"latin1_german1_ci":    5,
+	"hp8_english_ci":       6,
+	"koi8r_general_ci":     7,
+	"latin1_swedish_ci":    8,
+	"latin2_general_ci":    9,
+	"swe7_swedish_ci":      10,
+	"ascii_general_ci":     11,
+	"ujis_japanese_ci":     12,
+	"sjis_japanese_ci":     13,
+	"cp1251_bulgarian_ci":  14,
+	"latin1_danish_ci":     15,
+	"hebrew_general_ci":    16,
+	"tis620_thai_ci":       18,
+	"euckr_korean_ci":      19,
+	"latin7_estonian_cs":   20,
+	"latin2_hungarian_ci":  21,
+	"koi8u_general_ci":     22,
+	"cp1251_ukrainian_ci":  23,
+	"gb2312_chinese_ci":    24,
+	"greek_general_ci":     25,
+	"cp1250_general_ci":    26,
+	"latin2_croatian_ci":   27,
+	"gbk_chinese_ci":       28,
+	"cp1257_lithuanian_ci": 29,
+	"latin5_turkish_ci":    30,
+	"latin1_german2_ci":    31,
+	"armscii8_general_ci":  32,
+	"utf8_general_ci":      33,
+	"cp1250_czech_cs":      34,
+	//"ucs2_general_ci":          35,
+	"cp866_general_ci":    36,
+	"keybcs2_general_ci":  37,
+	"macce_general_ci":    38,
+	"macroman_general_ci": 39,
+	"cp852_general_ci":    40,
+	"latin7_general_ci":   41,
+	"latin7_general_cs":   42,
+	"macce_bin":           43,
+	"cp1250_croatian_ci":  44,
+	"utf8mb4_general_ci":  45,
+	"utf8mb4_bin":         46,
+	"latin1_bin":          47,
+	"latin1_general_ci":   48,
+	"latin1_general_cs":   49,
+	"cp1251_bin":          50,
+	"cp1251_general_ci":   51,
+	"cp1251_general_cs":   52,
+	"macroman_bin":        53,
+	//"utf16_general_ci":         54,
+	//"utf16_bin":                55,
+	//"utf16le_general_ci":       56,
+	"cp1256_general_ci": 57,
+	"cp1257_bin":        58,
+	"cp1257_general_ci": 59,
+	//"utf32_general_ci":         60,
+	//"utf32_bin":                61,
+	//"utf16le_bin":              62,
+	"binary":          63,
+	"armscii8_bin":    64,
+	"ascii_bin":       65,
+	"cp1250_bin":      66,
+	"cp1256_bin":      67,
+	"cp866_bin":       68,
+	"dec8_bin":        69,
+	"greek_bin":       70,
+	"hebrew_bin":      71,
+	"hp8_bin":         72,
+	"keybcs2_bin":     73,
+	"koi8r_bin":       74,
+	"koi8u_bin":       75,
+	"utf8_tolower_ci": 76,
+	"latin2_bin":      77,
+	"latin5_bin":      78,
+	"latin7_bin":      79,
+	"cp850_bin":       80,
+	"cp852_bin":       81,
+	"swe7_bin":        82,
+	"utf8_bin":        83,
+	"big5_bin":        84,
+	"euckr_bin":       85,
+	"gb2312_bin":      86,
+	"gbk_bin":         87,
+	"sjis_bin":        88,
+	"tis620_bin":      89,
+	//"ucs2_bin":                 90,
+	"ujis_bin":            91,
+	"geostd8_general_ci":  92,
+	"geostd8_bin":         93,
+	"latin1_spanish_ci":   94,
+	"cp932_japanese_ci":   95,
+	"cp932_bin":           96,
+	"eucjpms_japanese_ci": 97,
+	"eucjpms_bin":         98,
+	"cp1250_polish_ci":    99,
+	//"utf16_unicode_ci":         101,
+	//"utf16_icelandic_ci":       102,
+	//"utf16_latvian_ci":         103,
+	//"utf16_romanian_ci":        104,
+	//"utf16_slovenian_ci":       105,
+	//"utf16_polish_ci":          106,
+	//"utf16_estonian_ci":        107,
+	//"utf16_spanish_ci":         108,
+	//"utf16_swedish_ci":         109,
+	//"utf16_turkish_ci":         110,
+	//"utf16_czech_ci":           111,
+	//"utf16_danish_ci":          112,
+	//"utf16_lithuanian_ci":      113,
+	//"utf16_slovak_ci":          114,
+	//"utf16_spanish2_ci":        115,
+	//"utf16_roman_ci":           116,
+	//"utf16_persian_ci":         117,
+	//"utf16_esperanto_ci":       118,
+	//"utf16_hungarian_ci":       119,
+	//"utf16_sinhala_ci":         120,
+	//"utf16_german2_ci":         121,
+	//"utf16_croatian_ci":        122,
+	//"utf16_unicode_520_ci":     123,
+	//"utf16_vietnamese_ci":      124,
+	//"ucs2_unicode_ci":          128,
+	//"ucs2_icelandic_ci":        129,
+	//"ucs2_latvian_ci":          130,
+	//"ucs2_romanian_ci":         131,
+	//"ucs2_slovenian_ci":        132,
+	//"ucs2_polish_ci":           133,
+	//"ucs2_estonian_ci":         134,
+	//"ucs2_spanish_ci":          135,
+	//"ucs2_swedish_ci":          136,
+	//"ucs2_turkish_ci":          137,
+	//"ucs2_czech_ci":            138,
+	//"ucs2_danish_ci":           139,
+	//"ucs2_lithuanian_ci":       140,
+	//"ucs2_slovak_ci":           141,
+	//"ucs2_spanish2_ci":         142,
+	//"ucs2_roman_ci":            143,
+	//"ucs2_persian_ci":          144,
+	//"ucs2_esperanto_ci":        145,
+	//"ucs2_hungarian_ci":        146,
+	//"ucs2_sinhala_ci":          147,
+	//"ucs2_german2_ci":          148,
+	//"ucs2_croatian_ci":         149,
+	//"ucs2_unicode_520_ci":      150,
+	//"ucs2_vietnamese_ci":       151,
+	//"ucs2_general_mysql500_ci": 159,
+	//"utf32_unicode_ci":         160,
+	//"utf32_icelandic_ci":       161,
+	//"utf32_latvian_ci":         162,
+	//"utf32_romanian_ci":        163,
+	//"utf32_slovenian_ci":       164,
+	//"utf32_polish_ci":          165,
+	//"utf32_estonian_ci":        166,
+	//"utf32_spanish_ci":         167,
+	//"utf32_swedish_ci":         168,
+	//"utf32_turkish_ci":         169,
+	//"utf32_czech_ci":           170,
+	//"utf32_danish_ci":          171,
+	//"utf32_lithuanian_ci":      172,
+	//"utf32_slovak_ci":          173,
+	//"utf32_spanish2_ci":        174,
+	//"utf32_roman_ci":           175,
+	//"utf32_persian_ci":         176,
+	//"utf32_esperanto_ci":       177,
+	//"utf32_hungarian_ci":       178,
+	//"utf32_sinhala_ci":         179,
+	//"utf32_german2_ci":         180,
+	//"utf32_croatian_ci":        181,
+	//"utf32_unicode_520_ci":     182,
+	//"utf32_vietnamese_ci":      183,
+	"utf8_unicode_ci":          192,
+	"utf8_icelandic_ci":        193,
+	"utf8_latvian_ci":          194,
+	"utf8_romanian_ci":         195,
+	"utf8_slovenian_ci":        196,
+	"utf8_polish_ci":           197,
+	"utf8_estonian_ci":         198,
+	"utf8_spanish_ci":          199,
+	"utf8_swedish_ci":          200,
+	"utf8_turkish_ci":          201,
+	"utf8_czech_ci":            202,
+	"utf8_danish_ci":           203,
+	"utf8_lithuanian_ci":       204,
+	"utf8_slovak_ci":           205,
+	"utf8_spanish2_ci":         206,
+	"utf8_roman_ci":            207,
+	"utf8_persian_ci":          208,
+	"utf8_esperanto_ci":        209,
+	"utf8_hungarian_ci":        210,
+	"utf8_sinhala_ci":          211,
+	"utf8_german2_ci":          212,
+	"utf8_croatian_ci":         213,
+	"utf8_unicode_520_ci":      214,
+	"utf8_vietnamese_ci":       215,
+	"utf8_general_mysql500_ci": 223,
+	"utf8mb4_unicode_ci":       224,
+	"utf8mb4_icelandic_ci":     225,
+	"utf8mb4_latvian_ci":       226,
+	"utf8mb4_romanian_ci":      227,
+	"utf8mb4_slovenian_ci":     228,
+	"utf8mb4_polish_ci":        229,
+	"utf8mb4_estonian_ci":      230,
+	"utf8mb4_spanish_ci":       231,
+	"utf8mb4_swedish_ci":       232,
+	"utf8mb4_turkish_ci":       233,
+	"utf8mb4_czech_ci":         234,
+	"utf8mb4_danish_ci":        235,
+	"utf8mb4_lithuanian_ci":    236,
+	"utf8mb4_slovak_ci":        237,
+	"utf8mb4_spanish2_ci":      238,
+	"utf8mb4_roman_ci":         239,
+	"utf8mb4_persian_ci":       240,
+	"utf8mb4_esperanto_ci":     241,
+	"utf8mb4_hungarian_ci":     242,
+	"utf8mb4_sinhala_ci":       243,
+	"utf8mb4_german2_ci":       244,
+	"utf8mb4_croatian_ci":      245,
+	"utf8mb4_unicode_520_ci":   246,
+	"utf8mb4_vietnamese_ci":    247,
+	"gb18030_chinese_ci":       248,
+	"gb18030_bin":              249,
+	"gb18030_unicode_520_ci":   250,
+	"utf8mb4_0900_ai_ci":       255,
+}
+
+// A denylist of collations which is unsafe to interpolate parameters.
+// These multibyte encodings may contains 0x5c (`\`) in their trailing bytes.
+var unsafeCollations = map[string]bool{
+	"big5_chinese_ci":        true,
+	"sjis_japanese_ci":       true,
+	"gbk_chinese_ci":         true,
+	"big5_bin":               true,
+	"gb2312_bin":             true,
+	"gbk_bin":                true,
+	"sjis_bin":               true,
+	"cp932_japanese_ci":      true,
+	"cp932_bin":              true,
+	"gb18030_chinese_ci":     true,
+	"gb18030_bin":            true,
+	"gb18030_unicode_520_ci": true,
+}

vendor/github.com/go-sql-driver/mysql/conncheck.go

@@ -0,0 +1,55 @@
+// Go MySQL Driver - A MySQL-Driver for Go's database/sql package
+//
+// Copyright 2019 The Go-MySQL-Driver Authors. All rights reserved.
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this file,
+// You can obtain one at http://mozilla.org/MPL/2.0/.
+
+//go:build linux || darwin || dragonfly || freebsd || netbsd || openbsd || solaris || illumos
+// +build linux darwin dragonfly freebsd netbsd openbsd solaris illumos
+
+package mysql
+
+import (
+	"errors"
+	"io"
+	"net"
+	"syscall"
+)
+
+var errUnexpectedRead = errors.New("unexpected read from socket")
+
+func connCheck(conn net.Conn) error {
+	var sysErr error
+
+	sysConn, ok := conn.(syscall.Conn)
+	if !ok {
+		return nil
+	}
+	rawConn, err := sysConn.SyscallConn()
+	if err != nil {
+		return err
+	}
+
+	err = rawConn.Read(func(fd uintptr) bool {
+		var buf [1]byte
+		n, err := syscall.Read(int(fd), buf[:])
+		switch {
+		case n == 0 && err == nil:
+			sysErr = io.EOF
+		case n > 0:
+			sysErr = errUnexpectedRead
+		case err == syscall.EAGAIN || err == syscall.EWOULDBLOCK:
+			sysErr = nil
+		default:
+			sysErr = err
+		}
+		return true
+	})
+	if err != nil {
+		return err
+	}
+
+	return sysErr
+}

vendor/github.com/go-sql-driver/mysql/conncheck_dummy.go

@@ -0,0 +1,18 @@
+// Go MySQL Driver - A MySQL-Driver for Go's database/sql package
+//
+// Copyright 2019 The Go-MySQL-Driver Authors. All rights reserved.
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this file,
+// You can obtain one at http://mozilla.org/MPL/2.0/.
+
+//go:build !linux && !darwin && !dragonfly && !freebsd && !netbsd && !openbsd && !solaris && !illumos
+// +build !linux,!darwin,!dragonfly,!freebsd,!netbsd,!openbsd,!solaris,!illumos
+
+package mysql
+
+import "net"
+
+func connCheck(conn net.Conn) error {
+	return nil
+}

vendor/github.com/go-sql-driver/mysql/connection.go

@@ -0,0 +1,650 @@
+// Go MySQL Driver - A MySQL-Driver for Go's database/sql package
+//
+// Copyright 2012 The Go-MySQL-Driver Authors. All rights reserved.
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this file,
+// You can obtain one at http://mozilla.org/MPL/2.0/.
+
+package mysql
+
+import (
+	"context"
+	"database/sql"
+	"database/sql/driver"
+	"encoding/json"
+	"io"
+	"net"
+	"strconv"
+	"strings"
+	"time"
+)
+
+type mysqlConn struct {
+	buf              buffer
+	netConn          net.Conn
+	rawConn          net.Conn // underlying connection when netConn is TLS connection.
+	affectedRows     uint64
+	insertId         uint64
+	cfg              *Config
+	maxAllowedPacket int
+	maxWriteSize     int
+	writeTimeout     time.Duration
+	flags            clientFlag
+	status           statusFlag
+	sequence         uint8
+	parseTime        bool
+	reset            bool // set when the Go SQL package calls ResetSession
+
+	// for context support (Go 1.8+)
+	watching bool
+	watcher  chan<- context.Context
+	closech  chan struct{}
+	finished chan<- struct{}
+	canceled atomicError // set non-nil if conn is canceled
+	closed   atomicBool  // set when conn is closed, before closech is closed
+}
+
+// Handles parameters set in DSN after the connection is established
+func (mc *mysqlConn) handleParams() (err error) {
+	var cmdSet strings.Builder
+	for param, val := range mc.cfg.Params {
+		switch param {
+		// Charset: character_set_connection, character_set_client, character_set_results
+		case "charset":
+			charsets := strings.Split(val, ",")
+			for i := range charsets {
+				// ignore errors here - a charset may not exist
+				err = mc.exec("SET NAMES " + charsets[i])
+				if err == nil {
+					break
+				}
+			}
+			if err != nil {
+				return
+			}
+
+		// Other system vars accumulated in a single SET command
+		default:
+			if cmdSet.Len() == 0 {
+				// Heuristic: 29 chars for each other key=value to reduce reallocations
+				cmdSet.Grow(4 + len(param) + 1 + len(val) + 30*(len(mc.cfg.Params)-1))
+				cmdSet.WriteString("SET ")
+			} else {
+				cmdSet.WriteString(", ")
+			}
+			cmdSet.WriteString(param)
+			cmdSet.WriteString(" = ")
+			cmdSet.WriteString(val)
+		}
+	}
+
+	if cmdSet.Len() > 0 {
+		err = mc.exec(cmdSet.String())
+		if err != nil {
+			return
+		}
+	}
+
+	return
+}
+
+func (mc *mysqlConn) markBadConn(err error) error {
+	if mc == nil {
+		return err
+	}
+	if err != errBadConnNoWrite {
+		return err
+	}
+	return driver.ErrBadConn
+}
+
+func (mc *mysqlConn) Begin() (driver.Tx, error) {
+	return mc.begin(false)
+}
+
+func (mc *mysqlConn) begin(readOnly bool) (driver.Tx, error) {
+	if mc.closed.Load() {
+		errLog.Print(ErrInvalidConn)
+		return nil, driver.ErrBadConn
+	}
+	var q string
+	if readOnly {
+		q = "START TRANSACTION READ ONLY"
+	} else {
+		q = "START TRANSACTION"
+	}
+	err := mc.exec(q)
+	if err == nil {
+		return &mysqlTx{mc}, err
+	}
+	return nil, mc.markBadConn(err)
+}
+
+func (mc *mysqlConn) Close() (err error) {
+	// Makes Close idempotent
+	if !mc.closed.Load() {
+		err = mc.writeCommandPacket(comQuit)
+	}
+
+	mc.cleanup()
+
+	return
+}
+
+// Closes the network connection and unsets internal variables. Do not call this
+// function after successfully authentication, call Close instead. This function
+// is called before auth or on auth failure because MySQL will have already
+// closed the network connection.
+func (mc *mysqlConn) cleanup() {
+	if mc.closed.Swap(true) {
+		return
+	}
+
+	// Makes cleanup idempotent
+	close(mc.closech)
+	if mc.netConn == nil {
+		return
+	}
+	if err := mc.netConn.Close(); err != nil {
+		errLog.Print(err)
+	}
+}
+
+func (mc *mysqlConn) error() error {
+	if mc.closed.Load() {
+		if err := mc.canceled.Value(); err != nil {
+			return err
+		}
+		return ErrInvalidConn
+	}
+	return nil
+}
+
+func (mc *mysqlConn) Prepare(query string) (driver.Stmt, error) {
+	if mc.closed.Load() {
+		errLog.Print(ErrInvalidConn)
+		return nil, driver.ErrBadConn
+	}
+	// Send command
+	err := mc.writeCommandPacketStr(comStmtPrepare, query)
+	if err != nil {
+		// STMT_PREPARE is safe to retry.  So we can return ErrBadConn here.
+		errLog.Print(err)
+		return nil, driver.ErrBadConn
+	}
+
+	stmt := &mysqlStmt{
+		mc: mc,
+	}
+
+	// Read Result
+	columnCount, err := stmt.readPrepareResultPacket()
+	if err == nil {
+		if stmt.paramCount > 0 {
+			if err = mc.readUntilEOF(); err != nil {
+				return nil, err
+			}
+		}
+
+		if columnCount > 0 {
+			err = mc.readUntilEOF()
+		}
+	}
+
+	return stmt, err
+}
+
+func (mc *mysqlConn) interpolateParams(query string, args []driver.Value) (string, error) {
+	// Number of ? should be same to len(args)
+	if strings.Count(query, "?") != len(args) {
+		return "", driver.ErrSkip
+	}
+
+	buf, err := mc.buf.takeCompleteBuffer()
+	if err != nil {
+		// can not take the buffer. Something must be wrong with the connection
+		errLog.Print(err)
+		return "", ErrInvalidConn
+	}
+	buf = buf[:0]
+	argPos := 0
+
+	for i := 0; i < len(query); i++ {
+		q := strings.IndexByte(query[i:], '?')
+		if q == -1 {
+			buf = append(buf, query[i:]...)
+			break
+		}
+		buf = append(buf, query[i:i+q]...)
+		i += q
+
+		arg := args[argPos]
+		argPos++
+
+		if arg == nil {
+			buf = append(buf, "NULL"...)
+			continue
+		}
+
+		switch v := arg.(type) {
+		case int64:
+			buf = strconv.AppendInt(buf, v, 10)
+		case uint64:
+			// Handle uint64 explicitly because our custom ConvertValue emits unsigned values
+			buf = strconv.AppendUint(buf, v, 10)
+		case float64:
+			buf = strconv.AppendFloat(buf, v, 'g', -1, 64)
+		case bool:
+			if v {
+				buf = append(buf, '1')
+			} else {
+				buf = append(buf, '0')
+			}
+		case time.Time:
+			if v.IsZero() {
+				buf = append(buf, "'0000-00-00'"...)
+			} else {
+				buf = append(buf, '\'')
+				buf, err = appendDateTime(buf, v.In(mc.cfg.Loc))
+				if err != nil {
+					return "", err
+				}
+				buf = append(buf, '\'')
+			}
+		case json.RawMessage:
+			buf = append(buf, '\'')
+			if mc.status&statusNoBackslashEscapes == 0 {
+				buf = escapeBytesBackslash(buf, v)
+			} else {
+				buf = escapeBytesQuotes(buf, v)
+			}
+			buf = append(buf, '\'')
+		case []byte:
+			if v == nil {
+				buf = append(buf, "NULL"...)
+			} else {
+				buf = append(buf, "_binary'"...)
+				if mc.status&statusNoBackslashEscapes == 0 {
+					buf = escapeBytesBackslash(buf, v)
+				} else {
+					buf = escapeBytesQuotes(buf, v)
+				}
+				buf = append(buf, '\'')
+			}
+		case string:
+			buf = append(buf, '\'')
+			if mc.status&statusNoBackslashEscapes == 0 {
+				buf = escapeStringBackslash(buf, v)
+			} else {
+				buf = escapeStringQuotes(buf, v)
+			}
+			buf = append(buf, '\'')
+		default:
+			return "", driver.ErrSkip
+		}
+
+		if len(buf)+4 > mc.maxAllowedPacket {
+			return "", driver.ErrSkip
+		}
+	}
+	if argPos != len(args) {
+		return "", driver.ErrSkip
+	}
+	return string(buf), nil
+}
+
+func (mc *mysqlConn) Exec(query string, args []driver.Value) (driver.Result, error) {
+	if mc.closed.Load() {
+		errLog.Print(ErrInvalidConn)
+		return nil, driver.ErrBadConn
+	}
+	if len(args) != 0 {
+		if !mc.cfg.InterpolateParams {
+			return nil, driver.ErrSkip
+		}
+		// try to interpolate the parameters to save extra roundtrips for preparing and closing a statement
+		prepared, err := mc.interpolateParams(query, args)
+		if err != nil {
+			return nil, err
+		}
+		query = prepared
+	}
+	mc.affectedRows = 0
+	mc.insertId = 0
+
+	err := mc.exec(query)
+	if err == nil {
+		return &mysqlResult{
+			affectedRows: int64(mc.affectedRows),
+			insertId:     int64(mc.insertId),
+		}, err
+	}
+	return nil, mc.markBadConn(err)
+}
+
+// Internal function to execute commands
+func (mc *mysqlConn) exec(query string) error {
+	// Send command
+	if err := mc.writeCommandPacketStr(comQuery, query); err != nil {
+		return mc.markBadConn(err)
+	}
+
+	// Read Result
+	resLen, err := mc.readResultSetHeaderPacket()
+	if err != nil {
+		return err
+	}
+
+	if resLen > 0 {
+		// columns
+		if err := mc.readUntilEOF(); err != nil {
+			return err
+		}
+
+		// rows
+		if err := mc.readUntilEOF(); err != nil {
+			return err
+		}
+	}
+
+	return mc.discardResults()
+}
+
+func (mc *mysqlConn) Query(query string, args []driver.Value) (driver.Rows, error) {
+	return mc.query(query, args)
+}
+
+func (mc *mysqlConn) query(query string, args []driver.Value) (*textRows, error) {
+	if mc.closed.Load() {
+		errLog.Print(ErrInvalidConn)
+		return nil, driver.ErrBadConn
+	}
+	if len(args) != 0 {
+		if !mc.cfg.InterpolateParams {
+			return nil, driver.ErrSkip
+		}
+		// try client-side prepare to reduce roundtrip
+		prepared, err := mc.interpolateParams(query, args)
+		if err != nil {
+			return nil, err
+		}
+		query = prepared
+	}
+	// Send command
+	err := mc.writeCommandPacketStr(comQuery, query)
+	if err == nil {
+		// Read Result
+		var resLen int
+		resLen, err = mc.readResultSetHeaderPacket()
+		if err == nil {
+			rows := new(textRows)
+			rows.mc = mc
+
+			if resLen == 0 {
+				rows.rs.done = true
+
+				switch err := rows.NextResultSet(); err {
+				case nil, io.EOF:
+					return rows, nil
+				default:
+					return nil, err
+				}
+			}
+
+			// Columns
+			rows.rs.columns, err = mc.readColumns(resLen)
+			return rows, err
+		}
+	}
+	return nil, mc.markBadConn(err)
+}
+
+// Gets the value of the given MySQL System Variable
+// The returned byte slice is only valid until the next read
+func (mc *mysqlConn) getSystemVar(name string) ([]byte, error) {
+	// Send command
+	if err := mc.writeCommandPacketStr(comQuery, "SELECT @@"+name); err != nil {
+		return nil, err
+	}
+
+	// Read Result
+	resLen, err := mc.readResultSetHeaderPacket()
+	if err == nil {
+		rows := new(textRows)
+		rows.mc = mc
+		rows.rs.columns = []mysqlField{{fieldType: fieldTypeVarChar}}
+
+		if resLen > 0 {
+			// Columns
+			if err := mc.readUntilEOF(); err != nil {
+				return nil, err
+			}
+		}
+
+		dest := make([]driver.Value, resLen)
+		if err = rows.readRow(dest); err == nil {
+			return dest[0].([]byte), mc.readUntilEOF()
+		}
+	}
+	return nil, err
+}
+
+// finish is called when the query has canceled.
+func (mc *mysqlConn) cancel(err error) {
+	mc.canceled.Set(err)
+	mc.cleanup()
+}
+
+// finish is called when the query has succeeded.
+func (mc *mysqlConn) finish() {
+	if !mc.watching || mc.finished == nil {
+		return
+	}
+	select {
+	case mc.finished <- struct{}{}:
+		mc.watching = false
+	case <-mc.closech:
+	}
+}
+
+// Ping implements driver.Pinger interface
+func (mc *mysqlConn) Ping(ctx context.Context) (err error) {
+	if mc.closed.Load() {
+		errLog.Print(ErrInvalidConn)
+		return driver.ErrBadConn
+	}
+
+	if err = mc.watchCancel(ctx); err != nil {
+		return
+	}
+	defer mc.finish()
+
+	if err = mc.writeCommandPacket(comPing); err != nil {
+		return mc.markBadConn(err)
+	}
+
+	return mc.readResultOK()
+}
+
+// BeginTx implements driver.ConnBeginTx interface
+func (mc *mysqlConn) BeginTx(ctx context.Context, opts driver.TxOptions) (driver.Tx, error) {
+	if mc.closed.Load() {
+		return nil, driver.ErrBadConn
+	}
+
+	if err := mc.watchCancel(ctx); err != nil {
+		return nil, err
+	}
+	defer mc.finish()
+
+	if sql.IsolationLevel(opts.Isolation) != sql.LevelDefault {
+		level, err := mapIsolationLevel(opts.Isolation)
+		if err != nil {
+			return nil, err
+		}
+		err = mc.exec("SET TRANSACTION ISOLATION LEVEL " + level)
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	return mc.begin(opts.ReadOnly)
+}
+
+func (mc *mysqlConn) QueryContext(ctx context.Context, query string, args []driver.NamedValue) (driver.Rows, error) {
+	dargs, err := namedValueToValue(args)
+	if err != nil {
+		return nil, err
+	}
+
+	if err := mc.watchCancel(ctx); err != nil {
+		return nil, err
+	}
+
+	rows, err := mc.query(query, dargs)
+	if err != nil {
+		mc.finish()
+		return nil, err
+	}
+	rows.finish = mc.finish
+	return rows, err
+}
+
+func (mc *mysqlConn) ExecContext(ctx context.Context, query string, args []driver.NamedValue) (driver.Result, error) {
+	dargs, err := namedValueToValue(args)
+	if err != nil {
+		return nil, err
+	}
+
+	if err := mc.watchCancel(ctx); err != nil {
+		return nil, err
+	}
+	defer mc.finish()
+
+	return mc.Exec(query, dargs)
+}
+
+func (mc *mysqlConn) PrepareContext(ctx context.Context, query string) (driver.Stmt, error) {
+	if err := mc.watchCancel(ctx); err != nil {
+		return nil, err
+	}
+
+	stmt, err := mc.Prepare(query)
+	mc.finish()
+	if err != nil {
+		return nil, err
+	}
+
+	select {
+	default:
+	case <-ctx.Done():
+		stmt.Close()
+		return nil, ctx.Err()
+	}
+	return stmt, nil
+}
+
+func (stmt *mysqlStmt) QueryContext(ctx context.Context, args []driver.NamedValue) (driver.Rows, error) {
+	dargs, err := namedValueToValue(args)
+	if err != nil {
+		return nil, err
+	}
+
+	if err := stmt.mc.watchCancel(ctx); err != nil {
+		return nil, err
+	}
+
+	rows, err := stmt.query(dargs)
+	if err != nil {
+		stmt.mc.finish()
+		return nil, err
+	}
+	rows.finish = stmt.mc.finish
+	return rows, err
+}
+
+func (stmt *mysqlStmt) ExecContext(ctx context.Context, args []driver.NamedValue) (driver.Result, error) {
+	dargs, err := namedValueToValue(args)
+	if err != nil {
+		return nil, err
+	}
+
+	if err := stmt.mc.watchCancel(ctx); err != nil {
+		return nil, err
+	}
+	defer stmt.mc.finish()
+
+	return stmt.Exec(dargs)
+}
+
+func (mc *mysqlConn) watchCancel(ctx context.Context) error {
+	if mc.watching {
+		// Reach here if canceled,
+		// so the connection is already invalid
+		mc.cleanup()
+		return nil
+	}
+	// When ctx is already cancelled, don't watch it.
+	if err := ctx.Err(); err != nil {
+		return err
+	}
+	// When ctx is not cancellable, don't watch it.
+	if ctx.Done() == nil {
+		return nil
+	}
+	// When watcher is not alive, can't watch it.
+	if mc.watcher == nil {
+		return nil
+	}
+
+	mc.watching = true
+	mc.watcher <- ctx
+	return nil
+}
+
+func (mc *mysqlConn) startWatcher() {
+	watcher := make(chan context.Context, 1)
+	mc.watcher = watcher
+	finished := make(chan struct{})
+	mc.finished = finished
+	go func() {
+		for {
+			var ctx context.Context
+			select {
+			case ctx = <-watcher:
+			case <-mc.closech:
+				return
+			}
+
+			select {
+			case <-ctx.Done():
+				mc.cancel(ctx.Err())
+			case <-finished:
+			case <-mc.closech:
+				return
+			}
+		}
+	}()
+}
+
+func (mc *mysqlConn) CheckNamedValue(nv *driver.NamedValue) (err error) {
+	nv.Value, err = converter{}.ConvertValue(nv.Value)
+	return
+}
+
+// ResetSession implements driver.SessionResetter.
+// (From Go 1.10)
+func (mc *mysqlConn) ResetSession(ctx context.Context) error {
+	if mc.closed.Load() {
+		return driver.ErrBadConn
+	}
+	mc.reset = true
+	return nil
+}
+
+// IsValid implements driver.Validator interface
+// (From Go 1.15)
+func (mc *mysqlConn) IsValid() bool {
+	return !mc.closed.Load()
+}

vendor/github.com/go-sql-driver/mysql/connector.go

@@ -0,0 +1,146 @@
+// Go MySQL Driver - A MySQL-Driver for Go's database/sql package
+//
+// Copyright 2018 The Go-MySQL-Driver Authors. All rights reserved.
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this file,
+// You can obtain one at http://mozilla.org/MPL/2.0/.
+
+package mysql
+
+import (
+	"context"
+	"database/sql/driver"
+	"net"
+)
+
+type connector struct {
+	cfg *Config // immutable private copy.
+}
+
+// Connect implements driver.Connector interface.
+// Connect returns a connection to the database.
+func (c *connector) Connect(ctx context.Context) (driver.Conn, error) {
+	var err error
+
+	// New mysqlConn
+	mc := &mysqlConn{
+		maxAllowedPacket: maxPacketSize,
+		maxWriteSize:     maxPacketSize - 1,
+		closech:          make(chan struct{}),
+		cfg:              c.cfg,
+	}
+	mc.parseTime = mc.cfg.ParseTime
+
+	// Connect to Server
+	dialsLock.RLock()
+	dial, ok := dials[mc.cfg.Net]
+	dialsLock.RUnlock()
+	if ok {
+		dctx := ctx
+		if mc.cfg.Timeout > 0 {
+			var cancel context.CancelFunc
+			dctx, cancel = context.WithTimeout(ctx, c.cfg.Timeout)
+			defer cancel()
+		}
+		mc.netConn, err = dial(dctx, mc.cfg.Addr)
+	} else {
+		nd := net.Dialer{Timeout: mc.cfg.Timeout}
+		mc.netConn, err = nd.DialContext(ctx, mc.cfg.Net, mc.cfg.Addr)
+	}
+
+	if err != nil {
+		return nil, err
+	}
+
+	// Enable TCP Keepalives on TCP connections
+	if tc, ok := mc.netConn.(*net.TCPConn); ok {
+		if err := tc.SetKeepAlive(true); err != nil {
+			// Don't send COM_QUIT before handshake.
+			mc.netConn.Close()
+			mc.netConn = nil
+			return nil, err
+		}
+	}
+
+	// Call startWatcher for context support (From Go 1.8)
+	mc.startWatcher()
+	if err := mc.watchCancel(ctx); err != nil {
+		mc.cleanup()
+		return nil, err
+	}
+	defer mc.finish()
+
+	mc.buf = newBuffer(mc.netConn)
+
+	// Set I/O timeouts
+	mc.buf.timeout = mc.cfg.ReadTimeout
+	mc.writeTimeout = mc.cfg.WriteTimeout
+
+	// Reading Handshake Initialization Packet
+	authData, plugin, err := mc.readHandshakePacket()
+	if err != nil {
+		mc.cleanup()
+		return nil, err
+	}
+
+	if plugin == "" {
+		plugin = defaultAuthPlugin
+	}
+
+	// Send Client Authentication Packet
+	authResp, err := mc.auth(authData, plugin)
+	if err != nil {
+		// try the default auth plugin, if using the requested plugin failed
+		errLog.Print("could not use requested auth plugin '"+plugin+"': ", err.Error())
+		plugin = defaultAuthPlugin
+		authResp, err = mc.auth(authData, plugin)
+		if err != nil {
+			mc.cleanup()
+			return nil, err
+		}
+	}
+	if err = mc.writeHandshakeResponsePacket(authResp, plugin); err != nil {
+		mc.cleanup()
+		return nil, err
+	}
+
+	// Handle response to auth packet, switch methods if possible
+	if err = mc.handleAuthResult(authData, plugin); err != nil {
+		// Authentication failed and MySQL has already closed the connection
+		// (https://dev.mysql.com/doc/internals/en/authentication-fails.html).
+		// Do not send COM_QUIT, just cleanup and return the error.
+		mc.cleanup()
+		return nil, err
+	}
+
+	if mc.cfg.MaxAllowedPacket > 0 {
+		mc.maxAllowedPacket = mc.cfg.MaxAllowedPacket
+	} else {
+		// Get max allowed packet size
+		maxap, err := mc.getSystemVar("max_allowed_packet")
+		if err != nil {
+			mc.Close()
+			return nil, err
+		}
+		mc.maxAllowedPacket = stringToInt(maxap) - 1
+	}
+	if mc.maxAllowedPacket < maxPacketSize {
+		mc.maxWriteSize = mc.maxAllowedPacket
+	}
+
+	// Handle DSN Params
+	err = mc.handleParams()
+	if err != nil {
+		mc.Close()
+		return nil, err
+	}
+
+	return mc, nil
+}
+
+// Driver implements driver.Connector interface.
+// Driver returns &MySQLDriver{}.
+func (c *connector) Driver() driver.Driver {
+	return &MySQLDriver{}
+}

vendor/github.com/go-sql-driver/mysql/const.go

@@ -0,0 +1,174 @@
+// Go MySQL Driver - A MySQL-Driver for Go's database/sql package
+//
+// Copyright 2012 The Go-MySQL-Driver Authors. All rights reserved.
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this file,
+// You can obtain one at http://mozilla.org/MPL/2.0/.
+
+package mysql
+
+const (
+	defaultAuthPlugin       = "mysql_native_password"
+	defaultMaxAllowedPacket = 64 << 20 // 64 MiB. See https://github.com/go-sql-driver/mysql/issues/1355
+	minProtocolVersion      = 10
+	maxPacketSize           = 1<<24 - 1
+	timeFormat              = "2006-01-02 15:04:05.999999"
+)
+
+// MySQL constants documentation:
+// http://dev.mysql.com/doc/internals/en/client-server-protocol.html
+
+const (
+	iOK           byte = 0x00
+	iAuthMoreData byte = 0x01
+	iLocalInFile  byte = 0xfb
+	iEOF          byte = 0xfe
+	iERR          byte = 0xff
+)
+
+// https://dev.mysql.com/doc/internals/en/capability-flags.html#packet-Protocol::CapabilityFlags
+type clientFlag uint32
+
+const (
+	clientLongPassword clientFlag = 1 << iota
+	clientFoundRows
+	clientLongFlag
+	clientConnectWithDB
+	clientNoSchema
+	clientCompress
+	clientODBC
+	clientLocalFiles
+	clientIgnoreSpace
+	clientProtocol41
+	clientInteractive
+	clientSSL
+	clientIgnoreSIGPIPE
+	clientTransactions
+	clientReserved
+	clientSecureConn
+	clientMultiStatements
+	clientMultiResults
+	clientPSMultiResults
+	clientPluginAuth
+	clientConnectAttrs
+	clientPluginAuthLenEncClientData
+	clientCanHandleExpiredPasswords
+	clientSessionTrack
+	clientDeprecateEOF
+)
+
+const (
+	comQuit byte = iota + 1
+	comInitDB
+	comQuery
+	comFieldList
+	comCreateDB
+	comDropDB
+	comRefresh
+	comShutdown
+	comStatistics
+	comProcessInfo
+	comConnect
+	comProcessKill
+	comDebug
+	comPing
+	comTime
+	comDelayedInsert
+	comChangeUser
+	comBinlogDump
+	comTableDump
+	comConnectOut
+	comRegisterSlave
+	comStmtPrepare
+	comStmtExecute
+	comStmtSendLongData
+	comStmtClose
+	comStmtReset
+	comSetOption
+	comStmtFetch
+)
+
+// https://dev.mysql.com/doc/internals/en/com-query-response.html#packet-Protocol::ColumnType
+type fieldType byte
+
+const (
+	fieldTypeDecimal fieldType = iota
+	fieldTypeTiny
+	fieldTypeShort
+	fieldTypeLong
+	fieldTypeFloat
+	fieldTypeDouble
+	fieldTypeNULL
+	fieldTypeTimestamp
+	fieldTypeLongLong
+	fieldTypeInt24
+	fieldTypeDate
+	fieldTypeTime
+	fieldTypeDateTime
+	fieldTypeYear
+	fieldTypeNewDate
+	fieldTypeVarChar
+	fieldTypeBit
+)
+const (
+	fieldTypeJSON fieldType = iota + 0xf5
+	fieldTypeNewDecimal
+	fieldTypeEnum
+	fieldTypeSet
+	fieldTypeTinyBLOB
+	fieldTypeMediumBLOB
+	fieldTypeLongBLOB
+	fieldTypeBLOB
+	fieldTypeVarString
+	fieldTypeString
+	fieldTypeGeometry
+)
+
+type fieldFlag uint16
+
+const (
+	flagNotNULL fieldFlag = 1 << iota
+	flagPriKey
+	flagUniqueKey
+	flagMultipleKey
+	flagBLOB
+	flagUnsigned
+	flagZeroFill
+	flagBinary
+	flagEnum
+	flagAutoIncrement
+	flagTimestamp
+	flagSet
+	flagUnknown1
+	flagUnknown2
+	flagUnknown3
+	flagUnknown4
+)
+
+// http://dev.mysql.com/doc/internals/en/status-flags.html
+type statusFlag uint16
+
+const (
+	statusInTrans statusFlag = 1 << iota
+	statusInAutocommit
+	statusReserved // Not in documentation
+	statusMoreResultsExists
+	statusNoGoodIndexUsed
+	statusNoIndexUsed
+	statusCursorExists
+	statusLastRowSent
+	statusDbDropped
+	statusNoBackslashEscapes
+	statusMetadataChanged
+	statusQueryWasSlow
+	statusPsOutParams
+	statusInTransReadonly
+	statusSessionStateChanged
+)
+
+const (
+	cachingSha2PasswordRequestPublicKey          = 2
+	cachingSha2PasswordFastAuthSuccess           = 3
+	cachingSha2PasswordPerformFullAuthentication = 4
+)

vendor/github.com/go-sql-driver/mysql/driver.go

@@ -0,0 +1,107 @@
+// Copyright 2012 The Go-MySQL-Driver Authors. All rights reserved.
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this file,
+// You can obtain one at http://mozilla.org/MPL/2.0/.
+
+// Package mysql provides a MySQL driver for Go's database/sql package.
+//
+// The driver should be used via the database/sql package:
+//
+//	import "database/sql"
+//	import _ "github.com/go-sql-driver/mysql"
+//
+//	db, err := sql.Open("mysql", "user:password@/dbname")
+//
+// See https://github.com/go-sql-driver/mysql#usage for details
+package mysql
+
+import (
+	"context"
+	"database/sql"
+	"database/sql/driver"
+	"net"
+	"sync"
+)
+
+// MySQLDriver is exported to make the driver directly accessible.
+// In general the driver is used via the database/sql package.
+type MySQLDriver struct{}
+
+// DialFunc is a function which can be used to establish the network connection.
+// Custom dial functions must be registered with RegisterDial
+//
+// Deprecated: users should register a DialContextFunc instead
+type DialFunc func(addr string) (net.Conn, error)
+
+// DialContextFunc is a function which can be used to establish the network connection.
+// Custom dial functions must be registered with RegisterDialContext
+type DialContextFunc func(ctx context.Context, addr string) (net.Conn, error)
+
+var (
+	dialsLock sync.RWMutex
+	dials     map[string]DialContextFunc
+)
+
+// RegisterDialContext registers a custom dial function. It can then be used by the
+// network address mynet(addr), where mynet is the registered new network.
+// The current context for the connection and its address is passed to the dial function.
+func RegisterDialContext(net string, dial DialContextFunc) {
+	dialsLock.Lock()
+	defer dialsLock.Unlock()
+	if dials == nil {
+		dials = make(map[string]DialContextFunc)
+	}
+	dials[net] = dial
+}
+
+// RegisterDial registers a custom dial function. It can then be used by the
+// network address mynet(addr), where mynet is the registered new network.
+// addr is passed as a parameter to the dial function.
+//
+// Deprecated: users should call RegisterDialContext instead
+func RegisterDial(network string, dial DialFunc) {
+	RegisterDialContext(network, func(_ context.Context, addr string) (net.Conn, error) {
+		return dial(addr)
+	})
+}
+
+// Open new Connection.
+// See https://github.com/go-sql-driver/mysql#dsn-data-source-name for how
+// the DSN string is formatted
+func (d MySQLDriver) Open(dsn string) (driver.Conn, error) {
+	cfg, err := ParseDSN(dsn)
+	if err != nil {
+		return nil, err
+	}
+	c := &connector{
+		cfg: cfg,
+	}
+	return c.Connect(context.Background())
+}
+
+func init() {
+	sql.Register("mysql", &MySQLDriver{})
+}
+
+// NewConnector returns new driver.Connector.
+func NewConnector(cfg *Config) (driver.Connector, error) {
+	cfg = cfg.Clone()
+	// normalize the contents of cfg so calls to NewConnector have the same
+	// behavior as MySQLDriver.OpenConnector
+	if err := cfg.normalize(); err != nil {
+		return nil, err
+	}
+	return &connector{cfg: cfg}, nil
+}
+
+// OpenConnector implements driver.DriverContext.
+func (d MySQLDriver) OpenConnector(dsn string) (driver.Connector, error) {
+	cfg, err := ParseDSN(dsn)
+	if err != nil {
+		return nil, err
+	}
+	return &connector{
+		cfg: cfg,
+	}, nil
+}

vendor/github.com/go-sql-driver/mysql/dsn.go

@@ -0,0 +1,577 @@
+// Go MySQL Driver - A MySQL-Driver for Go's database/sql package
+//
+// Copyright 2016 The Go-MySQL-Driver Authors. All rights reserved.
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this file,
+// You can obtain one at http://mozilla.org/MPL/2.0/.
+
+package mysql
+
+import (
+	"bytes"
+	"crypto/rsa"
+	"crypto/tls"
+	"errors"
+	"fmt"
+	"math/big"
+	"net"
+	"net/url"
+	"sort"
+	"strconv"
+	"strings"
+	"time"
+)
+
+var (
+	errInvalidDSNUnescaped       = errors.New("invalid DSN: did you forget to escape a param value?")
+	errInvalidDSNAddr            = errors.New("invalid DSN: network address not terminated (missing closing brace)")
+	errInvalidDSNNoSlash         = errors.New("invalid DSN: missing the slash separating the database name")
+	errInvalidDSNUnsafeCollation = errors.New("invalid DSN: interpolateParams can not be used with unsafe collations")
+)
+
+// Config is a configuration parsed from a DSN string.
+// If a new Config is created instead of being parsed from a DSN string,
+// the NewConfig function should be used, which sets default values.
+type Config struct {
+	User             string            // Username
+	Passwd           string            // Password (requires User)
+	Net              string            // Network type
+	Addr             string            // Network address (requires Net)
+	DBName           string            // Database name
+	Params           map[string]string // Connection parameters
+	Collation        string            // Connection collation
+	Loc              *time.Location    // Location for time.Time values
+	MaxAllowedPacket int               // Max packet size allowed
+	ServerPubKey     string            // Server public key name
+	pubKey           *rsa.PublicKey    // Server public key
+	TLSConfig        string            // TLS configuration name
+	TLS              *tls.Config       // TLS configuration, its priority is higher than TLSConfig
+	Timeout          time.Duration     // Dial timeout
+	ReadTimeout      time.Duration     // I/O read timeout
+	WriteTimeout     time.Duration     // I/O write timeout
+
+	AllowAllFiles            bool // Allow all files to be used with LOAD DATA LOCAL INFILE
+	AllowCleartextPasswords  bool // Allows the cleartext client side plugin
+	AllowFallbackToPlaintext bool // Allows fallback to unencrypted connection if server does not support TLS
+	AllowNativePasswords     bool // Allows the native password authentication method
+	AllowOldPasswords        bool // Allows the old insecure password method
+	CheckConnLiveness        bool // Check connections for liveness before using them
+	ClientFoundRows          bool // Return number of matching rows instead of rows changed
+	ColumnsWithAlias         bool // Prepend table alias to column names
+	InterpolateParams        bool // Interpolate placeholders into query string
+	MultiStatements          bool // Allow multiple statements in one query
+	ParseTime                bool // Parse time values to time.Time
+	RejectReadOnly           bool // Reject read-only connections
+}
+
+// NewConfig creates a new Config and sets default values.
+func NewConfig() *Config {
+	return &Config{
+		Collation:            defaultCollation,
+		Loc:                  time.UTC,
+		MaxAllowedPacket:     defaultMaxAllowedPacket,
+		AllowNativePasswords: true,
+		CheckConnLiveness:    true,
+	}
+}
+
+func (cfg *Config) Clone() *Config {
+	cp := *cfg
+	if cp.TLS != nil {
+		cp.TLS = cfg.TLS.Clone()
+	}
+	if len(cp.Params) > 0 {
+		cp.Params = make(map[string]string, len(cfg.Params))
+		for k, v := range cfg.Params {
+			cp.Params[k] = v
+		}
+	}
+	if cfg.pubKey != nil {
+		cp.pubKey = &rsa.PublicKey{
+			N: new(big.Int).Set(cfg.pubKey.N),
+			E: cfg.pubKey.E,
+		}
+	}
+	return &cp
+}
+
+func (cfg *Config) normalize() error {
+	if cfg.InterpolateParams && unsafeCollations[cfg.Collation] {
+		return errInvalidDSNUnsafeCollation
+	}
+
+	// Set default network if empty
+	if cfg.Net == "" {
+		cfg.Net = "tcp"
+	}
+
+	// Set default address if empty
+	if cfg.Addr == "" {
+		switch cfg.Net {
+		case "tcp":
+			cfg.Addr = "127.0.0.1:3306"
+		case "unix":
+			cfg.Addr = "/tmp/mysql.sock"
+		default:
+			return errors.New("default addr for network '" + cfg.Net + "' unknown")
+		}
+	} else if cfg.Net == "tcp" {
+		cfg.Addr = ensureHavePort(cfg.Addr)
+	}
+
+	if cfg.TLS == nil {
+		switch cfg.TLSConfig {
+		case "false", "":
+			// don't set anything
+		case "true":
+			cfg.TLS = &tls.Config{}
+		case "skip-verify":
+			cfg.TLS = &tls.Config{InsecureSkipVerify: true}
+		case "preferred":
+			cfg.TLS = &tls.Config{InsecureSkipVerify: true}
+			cfg.AllowFallbackToPlaintext = true
+		default:
+			cfg.TLS = getTLSConfigClone(cfg.TLSConfig)
+			if cfg.TLS == nil {
+				return errors.New("invalid value / unknown config name: " + cfg.TLSConfig)
+			}
+		}
+	}
+
+	if cfg.TLS != nil && cfg.TLS.ServerName == "" && !cfg.TLS.InsecureSkipVerify {
+		host, _, err := net.SplitHostPort(cfg.Addr)
+		if err == nil {
+			cfg.TLS.ServerName = host
+		}
+	}
+
+	if cfg.ServerPubKey != "" {
+		cfg.pubKey = getServerPubKey(cfg.ServerPubKey)
+		if cfg.pubKey == nil {
+			return errors.New("invalid value / unknown server pub key name: " + cfg.ServerPubKey)
+		}
+	}
+
+	return nil
+}
+
+func writeDSNParam(buf *bytes.Buffer, hasParam *bool, name, value string) {
+	buf.Grow(1 + len(name) + 1 + len(value))
+	if !*hasParam {
+		*hasParam = true
+		buf.WriteByte('?')
+	} else {
+		buf.WriteByte('&')
+	}
+	buf.WriteString(name)
+	buf.WriteByte('=')
+	buf.WriteString(value)
+}
+
+// FormatDSN formats the given Config into a DSN string which can be passed to
+// the driver.
+func (cfg *Config) FormatDSN() string {
+	var buf bytes.Buffer
+
+	// [username[:password]@]
+	if len(cfg.User) > 0 {
+		buf.WriteString(cfg.User)
+		if len(cfg.Passwd) > 0 {
+			buf.WriteByte(':')
+			buf.WriteString(cfg.Passwd)
+		}
+		buf.WriteByte('@')
+	}
+
+	// [protocol[(address)]]
+	if len(cfg.Net) > 0 {
+		buf.WriteString(cfg.Net)
+		if len(cfg.Addr) > 0 {
+			buf.WriteByte('(')
+			buf.WriteString(cfg.Addr)
+			buf.WriteByte(')')
+		}
+	}
+
+	// /dbname
+	buf.WriteByte('/')
+	buf.WriteString(cfg.DBName)
+
+	// [?param1=value1&...&paramN=valueN]
+	hasParam := false
+
+	if cfg.AllowAllFiles {
+		hasParam = true
+		buf.WriteString("?allowAllFiles=true")
+	}
+
+	if cfg.AllowCleartextPasswords {
+		writeDSNParam(&buf, &hasParam, "allowCleartextPasswords", "true")
+	}
+
+	if cfg.AllowFallbackToPlaintext {
+		writeDSNParam(&buf, &hasParam, "allowFallbackToPlaintext", "true")
+	}
+
+	if !cfg.AllowNativePasswords {
+		writeDSNParam(&buf, &hasParam, "allowNativePasswords", "false")
+	}
+
+	if cfg.AllowOldPasswords {
+		writeDSNParam(&buf, &hasParam, "allowOldPasswords", "true")
+	}
+
+	if !cfg.CheckConnLiveness {
+		writeDSNParam(&buf, &hasParam, "checkConnLiveness", "false")
+	}
+
+	if cfg.ClientFoundRows {
+		writeDSNParam(&buf, &hasParam, "clientFoundRows", "true")
+	}
+
+	if col := cfg.Collation; col != defaultCollation && len(col) > 0 {
+		writeDSNParam(&buf, &hasParam, "collation", col)
+	}
+
+	if cfg.ColumnsWithAlias {
+		writeDSNParam(&buf, &hasParam, "columnsWithAlias", "true")
+	}
+
+	if cfg.InterpolateParams {
+		writeDSNParam(&buf, &hasParam, "interpolateParams", "true")
+	}
+
+	if cfg.Loc != time.UTC && cfg.Loc != nil {
+		writeDSNParam(&buf, &hasParam, "loc", url.QueryEscape(cfg.Loc.String()))
+	}
+
+	if cfg.MultiStatements {
+		writeDSNParam(&buf, &hasParam, "multiStatements", "true")
+	}
+
+	if cfg.ParseTime {
+		writeDSNParam(&buf, &hasParam, "parseTime", "true")
+	}
+
+	if cfg.ReadTimeout > 0 {
+		writeDSNParam(&buf, &hasParam, "readTimeout", cfg.ReadTimeout.String())
+	}
+
+	if cfg.RejectReadOnly {
+		writeDSNParam(&buf, &hasParam, "rejectReadOnly", "true")
+	}
+
+	if len(cfg.ServerPubKey) > 0 {
+		writeDSNParam(&buf, &hasParam, "serverPubKey", url.QueryEscape(cfg.ServerPubKey))
+	}
+
+	if cfg.Timeout > 0 {
+		writeDSNParam(&buf, &hasParam, "timeout", cfg.Timeout.String())
+	}
+
+	if len(cfg.TLSConfig) > 0 {
+		writeDSNParam(&buf, &hasParam, "tls", url.QueryEscape(cfg.TLSConfig))
+	}
+
+	if cfg.WriteTimeout > 0 {
+		writeDSNParam(&buf, &hasParam, "writeTimeout", cfg.WriteTimeout.String())
+	}
+
+	if cfg.MaxAllowedPacket != defaultMaxAllowedPacket {
+		writeDSNParam(&buf, &hasParam, "maxAllowedPacket", strconv.Itoa(cfg.MaxAllowedPacket))
+	}
+
+	// other params
+	if cfg.Params != nil {
+		var params []string
+		for param := range cfg.Params {
+			params = append(params, param)
+		}
+		sort.Strings(params)
+		for _, param := range params {
+			writeDSNParam(&buf, &hasParam, param, url.QueryEscape(cfg.Params[param]))
+		}
+	}
+
+	return buf.String()
+}
+
+// ParseDSN parses the DSN string to a Config
+func ParseDSN(dsn string) (cfg *Config, err error) {
+	// New config with some default values
+	cfg = NewConfig()
+
+	// [user[:password]@][net[(addr)]]/dbname[?param1=value1&paramN=valueN]
+	// Find the last '/' (since the password or the net addr might contain a '/')
+	foundSlash := false
+	for i := len(dsn) - 1; i >= 0; i-- {
+		if dsn[i] == '/' {
+			foundSlash = true
+			var j, k int
+
+			// left part is empty if i <= 0
+			if i > 0 {
+				// [username[:password]@][protocol[(address)]]
+				// Find the last '@' in dsn[:i]
+				for j = i; j >= 0; j-- {
+					if dsn[j] == '@' {
+						// username[:password]
+						// Find the first ':' in dsn[:j]
+						for k = 0; k < j; k++ {
+							if dsn[k] == ':' {
+								cfg.Passwd = dsn[k+1 : j]
+								break
+							}
+						}
+						cfg.User = dsn[:k]
+
+						break
+					}
+				}
+
+				// [protocol[(address)]]
+				// Find the first '(' in dsn[j+1:i]
+				for k = j + 1; k < i; k++ {
+					if dsn[k] == '(' {
+						// dsn[i-1] must be == ')' if an address is specified
+						if dsn[i-1] != ')' {
+							if strings.ContainsRune(dsn[k+1:i], ')') {
+								return nil, errInvalidDSNUnescaped
+							}
+							return nil, errInvalidDSNAddr
+						}
+						cfg.Addr = dsn[k+1 : i-1]
+						break
+					}
+				}
+				cfg.Net = dsn[j+1 : k]
+			}
+
+			// dbname[?param1=value1&...&paramN=valueN]
+			// Find the first '?' in dsn[i+1:]
+			for j = i + 1; j < len(dsn); j++ {
+				if dsn[j] == '?' {
+					if err = parseDSNParams(cfg, dsn[j+1:]); err != nil {
+						return
+					}
+					break
+				}
+			}
+			cfg.DBName = dsn[i+1 : j]
+
+			break
+		}
+	}
+
+	if !foundSlash && len(dsn) > 0 {
+		return nil, errInvalidDSNNoSlash
+	}
+
+	if err = cfg.normalize(); err != nil {
+		return nil, err
+	}
+	return
+}
+
+// parseDSNParams parses the DSN "query string"
+// Values must be url.QueryEscape'ed
+func parseDSNParams(cfg *Config, params string) (err error) {
+	for _, v := range strings.Split(params, "&") {
+		param := strings.SplitN(v, "=", 2)
+		if len(param) != 2 {
+			continue
+		}
+
+		// cfg params
+		switch value := param[1]; param[0] {
+		// Disable INFILE allowlist / enable all files
+		case "allowAllFiles":
+			var isBool bool
+			cfg.AllowAllFiles, isBool = readBool(value)
+			if !isBool {
+				return errors.New("invalid bool value: " + value)
+			}
+
+		// Use cleartext authentication mode (MySQL 5.5.10+)
+		case "allowCleartextPasswords":
+			var isBool bool
+			cfg.AllowCleartextPasswords, isBool = readBool(value)
+			if !isBool {
+				return errors.New("invalid bool value: " + value)
+			}
+
+		// Allow fallback to unencrypted connection if server does not support TLS
+		case "allowFallbackToPlaintext":
+			var isBool bool
+			cfg.AllowFallbackToPlaintext, isBool = readBool(value)
+			if !isBool {
+				return errors.New("invalid bool value: " + value)
+			}
+
+		// Use native password authentication
+		case "allowNativePasswords":
+			var isBool bool
+			cfg.AllowNativePasswords, isBool = readBool(value)
+			if !isBool {
+				return errors.New("invalid bool value: " + value)
+			}
+
+		// Use old authentication mode (pre MySQL 4.1)
+		case "allowOldPasswords":
+			var isBool bool
+			cfg.AllowOldPasswords, isBool = readBool(value)
+			if !isBool {
+				return errors.New("invalid bool value: " + value)
+			}
+
+		// Check connections for Liveness before using them
+		case "checkConnLiveness":
+			var isBool bool
+			cfg.CheckConnLiveness, isBool = readBool(value)
+			if !isBool {
+				return errors.New("invalid bool value: " + value)
+			}
+
+		// Switch "rowsAffected" mode
+		case "clientFoundRows":
+			var isBool bool
+			cfg.ClientFoundRows, isBool = readBool(value)
+			if !isBool {
+				return errors.New("invalid bool value: " + value)
+			}
+
+		// Collation
+		case "collation":
+			cfg.Collation = value
+
+		case "columnsWithAlias":
+			var isBool bool
+			cfg.ColumnsWithAlias, isBool = readBool(value)
+			if !isBool {
+				return errors.New("invalid bool value: " + value)
+			}
+
+		// Compression
+		case "compress":
+			return errors.New("compression not implemented yet")
+
+		// Enable client side placeholder substitution
+		case "interpolateParams":
+			var isBool bool
+			cfg.InterpolateParams, isBool = readBool(value)
+			if !isBool {
+				return errors.New("invalid bool value: " + value)
+			}
+
+		// Time Location
+		case "loc":
+			if value, err = url.QueryUnescape(value); err != nil {
+				return
+			}
+			cfg.Loc, err = time.LoadLocation(value)
+			if err != nil {
+				return
+			}
+
+		// multiple statements in one query
+		case "multiStatements":
+			var isBool bool
+			cfg.MultiStatements, isBool = readBool(value)
+			if !isBool {
+				return errors.New("invalid bool value: " + value)
+			}
+
+		// time.Time parsing
+		case "parseTime":
+			var isBool bool
+			cfg.ParseTime, isBool = readBool(value)
+			if !isBool {
+				return errors.New("invalid bool value: " + value)
+			}
+
+		// I/O read Timeout
+		case "readTimeout":
+			cfg.ReadTimeout, err = time.ParseDuration(value)
+			if err != nil {
+				return
+			}
+
+		// Reject read-only connections
+		case "rejectReadOnly":
+			var isBool bool
+			cfg.RejectReadOnly, isBool = readBool(value)
+			if !isBool {
+				return errors.New("invalid bool value: " + value)
+			}
+
+		// Server public key
+		case "serverPubKey":
+			name, err := url.QueryUnescape(value)
+			if err != nil {
+				return fmt.Errorf("invalid value for server pub key name: %v", err)
+			}
+			cfg.ServerPubKey = name
+
+		// Strict mode
+		case "strict":
+			panic("strict mode has been removed. See https://github.com/go-sql-driver/mysql/wiki/strict-mode")
+
+		// Dial Timeout
+		case "timeout":
+			cfg.Timeout, err = time.ParseDuration(value)
+			if err != nil {
+				return
+			}
+
+		// TLS-Encryption
+		case "tls":
+			boolValue, isBool := readBool(value)
+			if isBool {
+				if boolValue {
+					cfg.TLSConfig = "true"
+				} else {
+					cfg.TLSConfig = "false"
+				}
+			} else if vl := strings.ToLower(value); vl == "skip-verify" || vl == "preferred" {
+				cfg.TLSConfig = vl
+			} else {
+				name, err := url.QueryUnescape(value)
+				if err != nil {
+					return fmt.Errorf("invalid value for TLS config name: %v", err)
+				}
+				cfg.TLSConfig = name
+			}
+
+		// I/O write Timeout
+		case "writeTimeout":
+			cfg.WriteTimeout, err = time.ParseDuration(value)
+			if err != nil {
+				return
+			}
+		case "maxAllowedPacket":
+			cfg.MaxAllowedPacket, err = strconv.Atoi(value)
+			if err != nil {
+				return
+			}
+		default:
+			// lazy init
+			if cfg.Params == nil {
+				cfg.Params = make(map[string]string)
+			}
+
+			if cfg.Params[param[0]], err = url.QueryUnescape(value); err != nil {
+				return
+			}
+		}
+	}
+
+	return
+}
+
+func ensureHavePort(addr string) string {
+	if _, _, err := net.SplitHostPort(addr); err != nil {
+		return net.JoinHostPort(addr, "3306")
+	}
+	return addr
+}

vendor/github.com/go-sql-driver/mysql/errors.go

@@ -0,0 +1,77 @@
+// Go MySQL Driver - A MySQL-Driver for Go's database/sql package
+//
+// Copyright 2013 The Go-MySQL-Driver Authors. All rights reserved.
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this file,
+// You can obtain one at http://mozilla.org/MPL/2.0/.
+
+package mysql
+
+import (
+	"errors"
+	"fmt"
+	"log"
+	"os"
+)
+
+// Various errors the driver might return. Can change between driver versions.
+var (
+	ErrInvalidConn       = errors.New("invalid connection")
+	ErrMalformPkt        = errors.New("malformed packet")
+	ErrNoTLS             = errors.New("TLS requested but server does not support TLS")
+	ErrCleartextPassword = errors.New("this user requires clear text authentication. If you still want to use it, please add 'allowCleartextPasswords=1' to your DSN")
+	ErrNativePassword    = errors.New("this user requires mysql native password authentication.")
+	ErrOldPassword       = errors.New("this user requires old password authentication. If you still want to use it, please add 'allowOldPasswords=1' to your DSN. See also https://github.com/go-sql-driver/mysql/wiki/old_passwords")
+	ErrUnknownPlugin     = errors.New("this authentication plugin is not supported")
+	ErrOldProtocol       = errors.New("MySQL server does not support required protocol 41+")
+	ErrPktSync           = errors.New("commands out of sync. You can't run this command now")
+	ErrPktSyncMul        = errors.New("commands out of sync. Did you run multiple statements at once?")
+	ErrPktTooLarge       = errors.New("packet for query is too large. Try adjusting the `Config.MaxAllowedPacket`")
+	ErrBusyBuffer        = errors.New("busy buffer")
+
+	// errBadConnNoWrite is used for connection errors where nothing was sent to the database yet.
+	// If this happens first in a function starting a database interaction, it should be replaced by driver.ErrBadConn
+	// to trigger a resend.
+	// See https://github.com/go-sql-driver/mysql/pull/302
+	errBadConnNoWrite = errors.New("bad connection")
+)
+
+var errLog = Logger(log.New(os.Stderr, "[mysql] ", log.Ldate|log.Ltime|log.Lshortfile))
+
+// Logger is used to log critical error messages.
+type Logger interface {
+	Print(v ...interface{})
+}
+
+// SetLogger is used to set the logger for critical errors.
+// The initial logger is os.Stderr.
+func SetLogger(logger Logger) error {
+	if logger == nil {
+		return errors.New("logger is nil")
+	}
+	errLog = logger
+	return nil
+}
+
+// MySQLError is an error type which represents a single MySQL error
+type MySQLError struct {
+	Number   uint16
+	SQLState [5]byte
+	Message  string
+}
+
+func (me *MySQLError) Error() string {
+	if me.SQLState != [5]byte{} {
+		return fmt.Sprintf("Error %d (%s): %s", me.Number, me.SQLState, me.Message)
+	}
+
+	return fmt.Sprintf("Error %d: %s", me.Number, me.Message)
+}
+
+func (me *MySQLError) Is(err error) bool {
+	if merr, ok := err.(*MySQLError); ok {
+		return merr.Number == me.Number
+	}
+	return false
+}

vendor/github.com/go-sql-driver/mysql/fields.go

@@ -0,0 +1,206 @@
+// Go MySQL Driver - A MySQL-Driver for Go's database/sql package
+//
+// Copyright 2017 The Go-MySQL-Driver Authors. All rights reserved.
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this file,
+// You can obtain one at http://mozilla.org/MPL/2.0/.
+
+package mysql
+
+import (
+	"database/sql"
+	"reflect"
+)
+
+func (mf *mysqlField) typeDatabaseName() string {
+	switch mf.fieldType {
+	case fieldTypeBit:
+		return "BIT"
+	case fieldTypeBLOB:
+		if mf.charSet != collations[binaryCollation] {
+			return "TEXT"
+		}
+		return "BLOB"
+	case fieldTypeDate:
+		return "DATE"
+	case fieldTypeDateTime:
+		return "DATETIME"
+	case fieldTypeDecimal:
+		return "DECIMAL"
+	case fieldTypeDouble:
+		return "DOUBLE"
+	case fieldTypeEnum:
+		return "ENUM"
+	case fieldTypeFloat:
+		return "FLOAT"
+	case fieldTypeGeometry:
+		return "GEOMETRY"
+	case fieldTypeInt24:
+		return "MEDIUMINT"
+	case fieldTypeJSON:
+		return "JSON"
+	case fieldTypeLong:
+		if mf.flags&flagUnsigned != 0 {
+			return "UNSIGNED INT"
+		}
+		return "INT"
+	case fieldTypeLongBLOB:
+		if mf.charSet != collations[binaryCollation] {
+			return "LONGTEXT"
+		}
+		return "LONGBLOB"
+	case fieldTypeLongLong:
+		if mf.flags&flagUnsigned != 0 {
+			return "UNSIGNED BIGINT"
+		}
+		return "BIGINT"
+	case fieldTypeMediumBLOB:
+		if mf.charSet != collations[binaryCollation] {
+			return "MEDIUMTEXT"
+		}
+		return "MEDIUMBLOB"
+	case fieldTypeNewDate:
+		return "DATE"
+	case fieldTypeNewDecimal:
+		return "DECIMAL"
+	case fieldTypeNULL:
+		return "NULL"
+	case fieldTypeSet:
+		return "SET"
+	case fieldTypeShort:
+		if mf.flags&flagUnsigned != 0 {
+			return "UNSIGNED SMALLINT"
+		}
+		return "SMALLINT"
+	case fieldTypeString:
+		if mf.charSet == collations[binaryCollation] {
+			return "BINARY"
+		}
+		return "CHAR"
+	case fieldTypeTime:
+		return "TIME"
+	case fieldTypeTimestamp:
+		return "TIMESTAMP"
+	case fieldTypeTiny:
+		if mf.flags&flagUnsigned != 0 {
+			return "UNSIGNED TINYINT"
+		}
+		return "TINYINT"
+	case fieldTypeTinyBLOB:
+		if mf.charSet != collations[binaryCollation] {
+			return "TINYTEXT"
+		}
+		return "TINYBLOB"
+	case fieldTypeVarChar:
+		if mf.charSet == collations[binaryCollation] {
+			return "VARBINARY"
+		}
+		return "VARCHAR"
+	case fieldTypeVarString:
+		if mf.charSet == collations[binaryCollation] {
+			return "VARBINARY"
+		}
+		return "VARCHAR"
+	case fieldTypeYear:
+		return "YEAR"
+	default:
+		return ""
+	}
+}
+
+var (
+	scanTypeFloat32   = reflect.TypeOf(float32(0))
+	scanTypeFloat64   = reflect.TypeOf(float64(0))
+	scanTypeInt8      = reflect.TypeOf(int8(0))
+	scanTypeInt16     = reflect.TypeOf(int16(0))
+	scanTypeInt32     = reflect.TypeOf(int32(0))
+	scanTypeInt64     = reflect.TypeOf(int64(0))
+	scanTypeNullFloat = reflect.TypeOf(sql.NullFloat64{})
+	scanTypeNullInt   = reflect.TypeOf(sql.NullInt64{})
+	scanTypeNullTime  = reflect.TypeOf(sql.NullTime{})
+	scanTypeUint8     = reflect.TypeOf(uint8(0))
+	scanTypeUint16    = reflect.TypeOf(uint16(0))
+	scanTypeUint32    = reflect.TypeOf(uint32(0))
+	scanTypeUint64    = reflect.TypeOf(uint64(0))
+	scanTypeRawBytes  = reflect.TypeOf(sql.RawBytes{})
+	scanTypeUnknown   = reflect.TypeOf(new(interface{}))
+)
+
+type mysqlField struct {
+	tableName string
+	name      string
+	length    uint32
+	flags     fieldFlag
+	fieldType fieldType
+	decimals  byte
+	charSet   uint8
+}
+
+func (mf *mysqlField) scanType() reflect.Type {
+	switch mf.fieldType {
+	case fieldTypeTiny:
+		if mf.flags&flagNotNULL != 0 {
+			if mf.flags&flagUnsigned != 0 {
+				return scanTypeUint8
+			}
+			return scanTypeInt8
+		}
+		return scanTypeNullInt
+
+	case fieldTypeShort, fieldTypeYear:
+		if mf.flags&flagNotNULL != 0 {
+			if mf.flags&flagUnsigned != 0 {
+				return scanTypeUint16
+			}
+			return scanTypeInt16
+		}
+		return scanTypeNullInt
+
+	case fieldTypeInt24, fieldTypeLong:
+		if mf.flags&flagNotNULL != 0 {
+			if mf.flags&flagUnsigned != 0 {
+				return scanTypeUint32
+			}
+			return scanTypeInt32
+		}
+		return scanTypeNullInt
+
+	case fieldTypeLongLong:
+		if mf.flags&flagNotNULL != 0 {
+			if mf.flags&flagUnsigned != 0 {
+				return scanTypeUint64
+			}
+			return scanTypeInt64
+		}
+		return scanTypeNullInt
+
+	case fieldTypeFloat:
+		if mf.flags&flagNotNULL != 0 {
+			return scanTypeFloat32
+		}
+		return scanTypeNullFloat
+
+	case fieldTypeDouble:
+		if mf.flags&flagNotNULL != 0 {
+			return scanTypeFloat64
+		}
+		return scanTypeNullFloat
+
+	case fieldTypeDecimal, fieldTypeNewDecimal, fieldTypeVarChar,
+		fieldTypeBit, fieldTypeEnum, fieldTypeSet, fieldTypeTinyBLOB,
+		fieldTypeMediumBLOB, fieldTypeLongBLOB, fieldTypeBLOB,
+		fieldTypeVarString, fieldTypeString, fieldTypeGeometry, fieldTypeJSON,
+		fieldTypeTime:
+		return scanTypeRawBytes
+
+	case fieldTypeDate, fieldTypeNewDate,
+		fieldTypeTimestamp, fieldTypeDateTime:
+		// NullTime is always returned for more consistent behavior as it can
+		// handle both cases of parseTime regardless if the field is nullable.
+		return scanTypeNullTime
+
+	default:
+		return scanTypeUnknown
+	}
+}

vendor/github.com/go-sql-driver/mysql/fuzz.go

@@ -0,0 +1,25 @@
+// Go MySQL Driver - A MySQL-Driver for Go's database/sql package.
+//
+// Copyright 2020 The Go-MySQL-Driver Authors. All rights reserved.
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this file,
+// You can obtain one at http://mozilla.org/MPL/2.0/.
+
+//go:build gofuzz
+// +build gofuzz
+
+package mysql
+
+import (
+	"database/sql"
+)
+
+func Fuzz(data []byte) int {
+	db, err := sql.Open("mysql", string(data))
+	if err != nil {
+		return 0
+	}
+	db.Close()
+	return 1
+}

vendor/github.com/go-sql-driver/mysql/infile.go

@@ -0,0 +1,182 @@
+// Go MySQL Driver - A MySQL-Driver for Go's database/sql package
+//
+// Copyright 2013 The Go-MySQL-Driver Authors. All rights reserved.
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this file,
+// You can obtain one at http://mozilla.org/MPL/2.0/.
+
+package mysql
+
+import (
+	"fmt"
+	"io"
+	"os"
+	"strings"
+	"sync"
+)
+
+var (
+	fileRegister       map[string]bool
+	fileRegisterLock   sync.RWMutex
+	readerRegister     map[string]func() io.Reader
+	readerRegisterLock sync.RWMutex
+)
+
+// RegisterLocalFile adds the given file to the file allowlist,
+// so that it can be used by "LOAD DATA LOCAL INFILE <filepath>".
+// Alternatively you can allow the use of all local files with
+// the DSN parameter 'allowAllFiles=true'
+//
+//	filePath := "/home/gopher/data.csv"
+//	mysql.RegisterLocalFile(filePath)
+//	err := db.Exec("LOAD DATA LOCAL INFILE '" + filePath + "' INTO TABLE foo")
+//	if err != nil {
+//	...
+func RegisterLocalFile(filePath string) {
+	fileRegisterLock.Lock()
+	// lazy map init
+	if fileRegister == nil {
+		fileRegister = make(map[string]bool)
+	}
+
+	fileRegister[strings.Trim(filePath, `"`)] = true
+	fileRegisterLock.Unlock()
+}
+
+// DeregisterLocalFile removes the given filepath from the allowlist.
+func DeregisterLocalFile(filePath string) {
+	fileRegisterLock.Lock()
+	delete(fileRegister, strings.Trim(filePath, `"`))
+	fileRegisterLock.Unlock()
+}
+
+// RegisterReaderHandler registers a handler function which is used
+// to receive a io.Reader.
+// The Reader can be used by "LOAD DATA LOCAL INFILE Reader::<name>".
+// If the handler returns a io.ReadCloser Close() is called when the
+// request is finished.
+//
+//	mysql.RegisterReaderHandler("data", func() io.Reader {
+//		var csvReader io.Reader // Some Reader that returns CSV data
+//		... // Open Reader here
+//		return csvReader
+//	})
+//	err := db.Exec("LOAD DATA LOCAL INFILE 'Reader::data' INTO TABLE foo")
+//	if err != nil {
+//	...
+func RegisterReaderHandler(name string, handler func() io.Reader) {
+	readerRegisterLock.Lock()
+	// lazy map init
+	if readerRegister == nil {
+		readerRegister = make(map[string]func() io.Reader)
+	}
+
+	readerRegister[name] = handler
+	readerRegisterLock.Unlock()
+}
+
+// DeregisterReaderHandler removes the ReaderHandler function with
+// the given name from the registry.
+func DeregisterReaderHandler(name string) {
+	readerRegisterLock.Lock()
+	delete(readerRegister, name)
+	readerRegisterLock.Unlock()
+}
+
+func deferredClose(err *error, closer io.Closer) {
+	closeErr := closer.Close()
+	if *err == nil {
+		*err = closeErr
+	}
+}
+
+const defaultPacketSize = 16 * 1024 // 16KB is small enough for disk readahead and large enough for TCP
+
+func (mc *mysqlConn) handleInFileRequest(name string) (err error) {
+	var rdr io.Reader
+	var data []byte
+	packetSize := defaultPacketSize
+	if mc.maxWriteSize < packetSize {
+		packetSize = mc.maxWriteSize
+	}
+
+	if idx := strings.Index(name, "Reader::"); idx == 0 || (idx > 0 && name[idx-1] == '/') { // io.Reader
+		// The server might return an an absolute path. See issue #355.
+		name = name[idx+8:]
+
+		readerRegisterLock.RLock()
+		handler, inMap := readerRegister[name]
+		readerRegisterLock.RUnlock()
+
+		if inMap {
+			rdr = handler()
+			if rdr != nil {
+				if cl, ok := rdr.(io.Closer); ok {
+					defer deferredClose(&err, cl)
+				}
+			} else {
+				err = fmt.Errorf("Reader '%s' is <nil>", name)
+			}
+		} else {
+			err = fmt.Errorf("Reader '%s' is not registered", name)
+		}
+	} else { // File
+		name = strings.Trim(name, `"`)
+		fileRegisterLock.RLock()
+		fr := fileRegister[name]
+		fileRegisterLock.RUnlock()
+		if mc.cfg.AllowAllFiles || fr {
+			var file *os.File
+			var fi os.FileInfo
+
+			if file, err = os.Open(name); err == nil {
+				defer deferredClose(&err, file)
+
+				// get file size
+				if fi, err = file.Stat(); err == nil {
+					rdr = file
+					if fileSize := int(fi.Size()); fileSize < packetSize {
+						packetSize = fileSize
+					}
+				}
+			}
+		} else {
+			err = fmt.Errorf("local file '%s' is not registered", name)
+		}
+	}
+
+	// send content packets
+	// if packetSize == 0, the Reader contains no data
+	if err == nil && packetSize > 0 {
+		data := make([]byte, 4+packetSize)
+		var n int
+		for err == nil {
+			n, err = rdr.Read(data[4:])
+			if n > 0 {
+				if ioErr := mc.writePacket(data[:4+n]); ioErr != nil {
+					return ioErr
+				}
+			}
+		}
+		if err == io.EOF {
+			err = nil
+		}
+	}
+
+	// send empty packet (termination)
+	if data == nil {
+		data = make([]byte, 4)
+	}
+	if ioErr := mc.writePacket(data[:4]); ioErr != nil {
+		return ioErr
+	}
+
+	// read OK packet
+	if err == nil {
+		return mc.readResultOK()
+	}
+
+	mc.readPacket()
+	return err
+}

vendor/github.com/go-sql-driver/mysql/nulltime.go

@@ -0,0 +1,71 @@
+// Go MySQL Driver - A MySQL-Driver for Go's database/sql package
+//
+// Copyright 2013 The Go-MySQL-Driver Authors. All rights reserved.
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this file,
+// You can obtain one at http://mozilla.org/MPL/2.0/.
+
+package mysql
+
+import (
+	"database/sql"
+	"database/sql/driver"
+	"fmt"
+	"time"
+)
+
+// NullTime represents a time.Time that may be NULL.
+// NullTime implements the Scanner interface so
+// it can be used as a scan destination:
+//
+//	var nt NullTime
+//	err := db.QueryRow("SELECT time FROM foo WHERE id=?", id).Scan(&nt)
+//	...
+//	if nt.Valid {
+//	   // use nt.Time
+//	} else {
+//	   // NULL value
+//	}
+//
+// # This NullTime implementation is not driver-specific
+//
+// Deprecated: NullTime doesn't honor the loc DSN parameter.
+// NullTime.Scan interprets a time as UTC, not the loc DSN parameter.
+// Use sql.NullTime instead.
+type NullTime sql.NullTime
+
+// Scan implements the Scanner interface.
+// The value type must be time.Time or string / []byte (formatted time-string),
+// otherwise Scan fails.
+func (nt *NullTime) Scan(value interface{}) (err error) {
+	if value == nil {
+		nt.Time, nt.Valid = time.Time{}, false
+		return
+	}
+
+	switch v := value.(type) {
+	case time.Time:
+		nt.Time, nt.Valid = v, true
+		return
+	case []byte:
+		nt.Time, err = parseDateTime(v, time.UTC)
+		nt.Valid = (err == nil)
+		return
+	case string:
+		nt.Time, err = parseDateTime([]byte(v), time.UTC)
+		nt.Valid = (err == nil)
+		return
+	}
+
+	nt.Valid = false
+	return fmt.Errorf("Can't convert %T to time.Time", value)
+}
+
+// Value implements the driver Valuer interface.
+func (nt NullTime) Value() (driver.Value, error) {
+	if !nt.Valid {
+		return nil, nil
+	}
+	return nt.Time, nil
+}

vendor/github.com/go-sql-driver/mysql/result.go

@@ -0,0 +1,22 @@
+// Go MySQL Driver - A MySQL-Driver for Go's database/sql package
+//
+// Copyright 2012 The Go-MySQL-Driver Authors. All rights reserved.
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this file,
+// You can obtain one at http://mozilla.org/MPL/2.0/.
+
+package mysql
+
+type mysqlResult struct {
+	affectedRows int64
+	insertId     int64
+}
+
+func (res *mysqlResult) LastInsertId() (int64, error) {
+	return res.insertId, nil
+}
+
+func (res *mysqlResult) RowsAffected() (int64, error) {
+	return res.affectedRows, nil
+}

vendor/github.com/go-sql-driver/mysql/rows.go

@@ -0,0 +1,223 @@
+// Go MySQL Driver - A MySQL-Driver for Go's database/sql package
+//
+// Copyright 2012 The Go-MySQL-Driver Authors. All rights reserved.
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this file,
+// You can obtain one at http://mozilla.org/MPL/2.0/.
+
+package mysql
+
+import (
+	"database/sql/driver"
+	"io"
+	"math"
+	"reflect"
+)
+
+type resultSet struct {
+	columns     []mysqlField
+	columnNames []string
+	done        bool
+}
+
+type mysqlRows struct {
+	mc     *mysqlConn
+	rs     resultSet
+	finish func()
+}
+
+type binaryRows struct {
+	mysqlRows
+}
+
+type textRows struct {
+	mysqlRows
+}
+
+func (rows *mysqlRows) Columns() []string {
+	if rows.rs.columnNames != nil {
+		return rows.rs.columnNames
+	}
+
+	columns := make([]string, len(rows.rs.columns))
+	if rows.mc != nil && rows.mc.cfg.ColumnsWithAlias {
+		for i := range columns {
+			if tableName := rows.rs.columns[i].tableName; len(tableName) > 0 {
+				columns[i] = tableName + "." + rows.rs.columns[i].name
+			} else {
+				columns[i] = rows.rs.columns[i].name
+			}
+		}
+	} else {
+		for i := range columns {
+			columns[i] = rows.rs.columns[i].name
+		}
+	}
+
+	rows.rs.columnNames = columns
+	return columns
+}
+
+func (rows *mysqlRows) ColumnTypeDatabaseTypeName(i int) string {
+	return rows.rs.columns[i].typeDatabaseName()
+}
+
+// func (rows *mysqlRows) ColumnTypeLength(i int) (length int64, ok bool) {
+// 	return int64(rows.rs.columns[i].length), true
+// }
+
+func (rows *mysqlRows) ColumnTypeNullable(i int) (nullable, ok bool) {
+	return rows.rs.columns[i].flags&flagNotNULL == 0, true
+}
+
+func (rows *mysqlRows) ColumnTypePrecisionScale(i int) (int64, int64, bool) {
+	column := rows.rs.columns[i]
+	decimals := int64(column.decimals)
+
+	switch column.fieldType {
+	case fieldTypeDecimal, fieldTypeNewDecimal:
+		if decimals > 0 {
+			return int64(column.length) - 2, decimals, true
+		}
+		return int64(column.length) - 1, decimals, true
+	case fieldTypeTimestamp, fieldTypeDateTime, fieldTypeTime:
+		return decimals, decimals, true
+	case fieldTypeFloat, fieldTypeDouble:
+		if decimals == 0x1f {
+			return math.MaxInt64, math.MaxInt64, true
+		}
+		return math.MaxInt64, decimals, true
+	}
+
+	return 0, 0, false
+}
+
+func (rows *mysqlRows) ColumnTypeScanType(i int) reflect.Type {
+	return rows.rs.columns[i].scanType()
+}
+
+func (rows *mysqlRows) Close() (err error) {
+	if f := rows.finish; f != nil {
+		f()
+		rows.finish = nil
+	}
+
+	mc := rows.mc
+	if mc == nil {
+		return nil
+	}
+	if err := mc.error(); err != nil {
+		return err
+	}
+
+	// flip the buffer for this connection if we need to drain it.
+	// note that for a successful query (i.e. one where rows.next()
+	// has been called until it returns false), `rows.mc` will be nil
+	// by the time the user calls `(*Rows).Close`, so we won't reach this
+	// see: https://github.com/golang/go/commit/651ddbdb5056ded455f47f9c494c67b389622a47
+	mc.buf.flip()
+
+	// Remove unread packets from stream
+	if !rows.rs.done {
+		err = mc.readUntilEOF()
+	}
+	if err == nil {
+		if err = mc.discardResults(); err != nil {
+			return err
+		}
+	}
+
+	rows.mc = nil
+	return err
+}
+
+func (rows *mysqlRows) HasNextResultSet() (b bool) {
+	if rows.mc == nil {
+		return false
+	}
+	return rows.mc.status&statusMoreResultsExists != 0
+}
+
+func (rows *mysqlRows) nextResultSet() (int, error) {
+	if rows.mc == nil {
+		return 0, io.EOF
+	}
+	if err := rows.mc.error(); err != nil {
+		return 0, err
+	}
+
+	// Remove unread packets from stream
+	if !rows.rs.done {
+		if err := rows.mc.readUntilEOF(); err != nil {
+			return 0, err
+		}
+		rows.rs.done = true
+	}
+
+	if !rows.HasNextResultSet() {
+		rows.mc = nil
+		return 0, io.EOF
+	}
+	rows.rs = resultSet{}
+	return rows.mc.readResultSetHeaderPacket()
+}
+
+func (rows *mysqlRows) nextNotEmptyResultSet() (int, error) {
+	for {
+		resLen, err := rows.nextResultSet()
+		if err != nil {
+			return 0, err
+		}
+
+		if resLen > 0 {
+			return resLen, nil
+		}
+
+		rows.rs.done = true
+	}
+}
+
+func (rows *binaryRows) NextResultSet() error {
+	resLen, err := rows.nextNotEmptyResultSet()
+	if err != nil {
+		return err
+	}
+
+	rows.rs.columns, err = rows.mc.readColumns(resLen)
+	return err
+}
+
+func (rows *binaryRows) Next(dest []driver.Value) error {
+	if mc := rows.mc; mc != nil {
+		if err := mc.error(); err != nil {
+			return err
+		}
+
+		// Fetch next row from stream
+		return rows.readRow(dest)
+	}
+	return io.EOF
+}
+
+func (rows *textRows) NextResultSet() (err error) {
+	resLen, err := rows.nextNotEmptyResultSet()
+	if err != nil {
+		return err
+	}
+
+	rows.rs.columns, err = rows.mc.readColumns(resLen)
+	return err
+}
+
+func (rows *textRows) Next(dest []driver.Value) error {
+	if mc := rows.mc; mc != nil {
+		if err := mc.error(); err != nil {
+			return err
+		}
+
+		// Fetch next row from stream
+		return rows.readRow(dest)
+	}
+	return io.EOF
+}

vendor/github.com/go-sql-driver/mysql/statement.go

@@ -0,0 +1,220 @@
+// Go MySQL Driver - A MySQL-Driver for Go's database/sql package
+//
+// Copyright 2012 The Go-MySQL-Driver Authors. All rights reserved.
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this file,
+// You can obtain one at http://mozilla.org/MPL/2.0/.
+
+package mysql
+
+import (
+	"database/sql/driver"
+	"encoding/json"
+	"fmt"
+	"io"
+	"reflect"
+)
+
+type mysqlStmt struct {
+	mc         *mysqlConn
+	id         uint32
+	paramCount int
+}
+
+func (stmt *mysqlStmt) Close() error {
+	if stmt.mc == nil || stmt.mc.closed.Load() {
+		// driver.Stmt.Close can be called more than once, thus this function
+		// has to be idempotent.
+		// See also Issue #450 and golang/go#16019.
+		//errLog.Print(ErrInvalidConn)
+		return driver.ErrBadConn
+	}
+
+	err := stmt.mc.writeCommandPacketUint32(comStmtClose, stmt.id)
+	stmt.mc = nil
+	return err
+}
+
+func (stmt *mysqlStmt) NumInput() int {
+	return stmt.paramCount
+}
+
+func (stmt *mysqlStmt) ColumnConverter(idx int) driver.ValueConverter {
+	return converter{}
+}
+
+func (stmt *mysqlStmt) CheckNamedValue(nv *driver.NamedValue) (err error) {
+	nv.Value, err = converter{}.ConvertValue(nv.Value)
+	return
+}
+
+func (stmt *mysqlStmt) Exec(args []driver.Value) (driver.Result, error) {
+	if stmt.mc.closed.Load() {
+		errLog.Print(ErrInvalidConn)
+		return nil, driver.ErrBadConn
+	}
+	// Send command
+	err := stmt.writeExecutePacket(args)
+	if err != nil {
+		return nil, stmt.mc.markBadConn(err)
+	}
+
+	mc := stmt.mc
+
+	mc.affectedRows = 0
+	mc.insertId = 0
+
+	// Read Result
+	resLen, err := mc.readResultSetHeaderPacket()
+	if err != nil {
+		return nil, err
+	}
+
+	if resLen > 0 {
+		// Columns
+		if err = mc.readUntilEOF(); err != nil {
+			return nil, err
+		}
+
+		// Rows
+		if err := mc.readUntilEOF(); err != nil {
+			return nil, err
+		}
+	}
+
+	if err := mc.discardResults(); err != nil {
+		return nil, err
+	}
+
+	return &mysqlResult{
+		affectedRows: int64(mc.affectedRows),
+		insertId:     int64(mc.insertId),
+	}, nil
+}
+
+func (stmt *mysqlStmt) Query(args []driver.Value) (driver.Rows, error) {
+	return stmt.query(args)
+}
+
+func (stmt *mysqlStmt) query(args []driver.Value) (*binaryRows, error) {
+	if stmt.mc.closed.Load() {
+		errLog.Print(ErrInvalidConn)
+		return nil, driver.ErrBadConn
+	}
+	// Send command
+	err := stmt.writeExecutePacket(args)
+	if err != nil {
+		return nil, stmt.mc.markBadConn(err)
+	}
+
+	mc := stmt.mc
+
+	// Read Result
+	resLen, err := mc.readResultSetHeaderPacket()
+	if err != nil {
+		return nil, err
+	}
+
+	rows := new(binaryRows)
+
+	if resLen > 0 {
+		rows.mc = mc
+		rows.rs.columns, err = mc.readColumns(resLen)
+	} else {
+		rows.rs.done = true
+
+		switch err := rows.NextResultSet(); err {
+		case nil, io.EOF:
+			return rows, nil
+		default:
+			return nil, err
+		}
+	}
+
+	return rows, err
+}
+
+var jsonType = reflect.TypeOf(json.RawMessage{})
+
+type converter struct{}
+
+// ConvertValue mirrors the reference/default converter in database/sql/driver
+// with _one_ exception.  We support uint64 with their high bit and the default
+// implementation does not.  This function should be kept in sync with
+// database/sql/driver defaultConverter.ConvertValue() except for that
+// deliberate difference.
+func (c converter) ConvertValue(v interface{}) (driver.Value, error) {
+	if driver.IsValue(v) {
+		return v, nil
+	}
+
+	if vr, ok := v.(driver.Valuer); ok {
+		sv, err := callValuerValue(vr)
+		if err != nil {
+			return nil, err
+		}
+		if driver.IsValue(sv) {
+			return sv, nil
+		}
+		// A value returned from the Valuer interface can be "a type handled by
+		// a database driver's NamedValueChecker interface" so we should accept
+		// uint64 here as well.
+		if u, ok := sv.(uint64); ok {
+			return u, nil
+		}
+		return nil, fmt.Errorf("non-Value type %T returned from Value", sv)
+	}
+	rv := reflect.ValueOf(v)
+	switch rv.Kind() {
+	case reflect.Ptr:
+		// indirect pointers
+		if rv.IsNil() {
+			return nil, nil
+		} else {
+			return c.ConvertValue(rv.Elem().Interface())
+		}
+	case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
+		return rv.Int(), nil
+	case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
+		return rv.Uint(), nil
+	case reflect.Float32, reflect.Float64:
+		return rv.Float(), nil
+	case reflect.Bool:
+		return rv.Bool(), nil
+	case reflect.Slice:
+		switch t := rv.Type(); {
+		case t == jsonType:
+			return v, nil
+		case t.Elem().Kind() == reflect.Uint8:
+			return rv.Bytes(), nil
+		default:
+			return nil, fmt.Errorf("unsupported type %T, a slice of %s", v, t.Elem().Kind())
+		}
+	case reflect.String:
+		return rv.String(), nil
+	}
+	return nil, fmt.Errorf("unsupported type %T, a %s", v, rv.Kind())
+}
+
+var valuerReflectType = reflect.TypeOf((*driver.Valuer)(nil)).Elem()
+
+// callValuerValue returns vr.Value(), with one exception:
+// If vr.Value is an auto-generated method on a pointer type and the
+// pointer is nil, it would panic at runtime in the panicwrap
+// method. Treat it like nil instead.
+//
+// This is so people can implement driver.Value on value types and
+// still use nil pointers to those types to mean nil/NULL, just like
+// string/*string.
+//
+// This is an exact copy of the same-named unexported function from the
+// database/sql package.
+func callValuerValue(vr driver.Valuer) (v driver.Value, err error) {
+	if rv := reflect.ValueOf(vr); rv.Kind() == reflect.Ptr &&
+		rv.IsNil() &&
+		rv.Type().Elem().Implements(valuerReflectType) {
+		return nil, nil
+	}
+	return vr.Value()
+}

vendor/github.com/go-sql-driver/mysql/transaction.go

@@ -0,0 +1,31 @@
+// Go MySQL Driver - A MySQL-Driver for Go's database/sql package
+//
+// Copyright 2012 The Go-MySQL-Driver Authors. All rights reserved.
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this file,
+// You can obtain one at http://mozilla.org/MPL/2.0/.
+
+package mysql
+
+type mysqlTx struct {
+	mc *mysqlConn
+}
+
+func (tx *mysqlTx) Commit() (err error) {
+	if tx.mc == nil || tx.mc.closed.Load() {
+		return ErrInvalidConn
+	}
+	err = tx.mc.exec("COMMIT")
+	tx.mc = nil
+	return
+}
+
+func (tx *mysqlTx) Rollback() (err error) {
+	if tx.mc == nil || tx.mc.closed.Load() {
+		return ErrInvalidConn
+	}
+	err = tx.mc.exec("ROLLBACK")
+	tx.mc = nil
+	return
+}

vendor/github.com/go-sql-driver/mysql/utils.go

@@ -0,0 +1,834 @@
+// Go MySQL Driver - A MySQL-Driver for Go's database/sql package
+//
+// Copyright 2012 The Go-MySQL-Driver Authors. All rights reserved.
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this file,
+// You can obtain one at http://mozilla.org/MPL/2.0/.
+
+package mysql
+
+import (
+	"crypto/tls"
+	"database/sql"
+	"database/sql/driver"
+	"encoding/binary"
+	"errors"
+	"fmt"
+	"io"
+	"strconv"
+	"strings"
+	"sync"
+	"sync/atomic"
+	"time"
+)
+
+// Registry for custom tls.Configs
+var (
+	tlsConfigLock     sync.RWMutex
+	tlsConfigRegistry map[string]*tls.Config
+)
+
+// RegisterTLSConfig registers a custom tls.Config to be used with sql.Open.
+// Use the key as a value in the DSN where tls=value.
+//
+// Note: The provided tls.Config is exclusively owned by the driver after
+// registering it.
+//
+//	rootCertPool := x509.NewCertPool()
+//	pem, err := ioutil.ReadFile("/path/ca-cert.pem")
+//	if err != nil {
+//	    log.Fatal(err)
+//	}
+//	if ok := rootCertPool.AppendCertsFromPEM(pem); !ok {
+//	    log.Fatal("Failed to append PEM.")
+//	}
+//	clientCert := make([]tls.Certificate, 0, 1)
+//	certs, err := tls.LoadX509KeyPair("/path/client-cert.pem", "/path/client-key.pem")
+//	if err != nil {
+//	    log.Fatal(err)
+//	}
+//	clientCert = append(clientCert, certs)
+//	mysql.RegisterTLSConfig("custom", &tls.Config{
+//	    RootCAs: rootCertPool,
+//	    Certificates: clientCert,
+//	})
+//	db, err := sql.Open("mysql", "user@tcp(localhost:3306)/test?tls=custom")
+func RegisterTLSConfig(key string, config *tls.Config) error {
+	if _, isBool := readBool(key); isBool || strings.ToLower(key) == "skip-verify" || strings.ToLower(key) == "preferred" {
+		return fmt.Errorf("key '%s' is reserved", key)
+	}
+
+	tlsConfigLock.Lock()
+	if tlsConfigRegistry == nil {
+		tlsConfigRegistry = make(map[string]*tls.Config)
+	}
+
+	tlsConfigRegistry[key] = config
+	tlsConfigLock.Unlock()
+	return nil
+}
+
+// DeregisterTLSConfig removes the tls.Config associated with key.
+func DeregisterTLSConfig(key string) {
+	tlsConfigLock.Lock()
+	if tlsConfigRegistry != nil {
+		delete(tlsConfigRegistry, key)
+	}
+	tlsConfigLock.Unlock()
+}
+
+func getTLSConfigClone(key string) (config *tls.Config) {
+	tlsConfigLock.RLock()
+	if v, ok := tlsConfigRegistry[key]; ok {
+		config = v.Clone()
+	}
+	tlsConfigLock.RUnlock()
+	return
+}
+
+// Returns the bool value of the input.
+// The 2nd return value indicates if the input was a valid bool value
+func readBool(input string) (value bool, valid bool) {
+	switch input {
+	case "1", "true", "TRUE", "True":
+		return true, true
+	case "0", "false", "FALSE", "False":
+		return false, true
+	}
+
+	// Not a valid bool value
+	return
+}
+
+/******************************************************************************
+*                           Time related utils                                *
+******************************************************************************/
+
+func parseDateTime(b []byte, loc *time.Location) (time.Time, error) {
+	const base = "0000-00-00 00:00:00.000000"
+	switch len(b) {
+	case 10, 19, 21, 22, 23, 24, 25, 26: // up to "YYYY-MM-DD HH:MM:SS.MMMMMM"
+		if string(b) == base[:len(b)] {
+			return time.Time{}, nil
+		}
+
+		year, err := parseByteYear(b)
+		if err != nil {
+			return time.Time{}, err
+		}
+		if b[4] != '-' {
+			return time.Time{}, fmt.Errorf("bad value for field: `%c`", b[4])
+		}
+
+		m, err := parseByte2Digits(b[5], b[6])
+		if err != nil {
+			return time.Time{}, err
+		}
+		month := time.Month(m)
+
+		if b[7] != '-' {
+			return time.Time{}, fmt.Errorf("bad value for field: `%c`", b[7])
+		}
+
+		day, err := parseByte2Digits(b[8], b[9])
+		if err != nil {
+			return time.Time{}, err
+		}
+		if len(b) == 10 {
+			return time.Date(year, month, day, 0, 0, 0, 0, loc), nil
+		}
+
+		if b[10] != ' ' {
+			return time.Time{}, fmt.Errorf("bad value for field: `%c`", b[10])
+		}
+
+		hour, err := parseByte2Digits(b[11], b[12])
+		if err != nil {
+			return time.Time{}, err
+		}
+		if b[13] != ':' {
+			return time.Time{}, fmt.Errorf("bad value for field: `%c`", b[13])
+		}
+
+		min, err := parseByte2Digits(b[14], b[15])
+		if err != nil {
+			return time.Time{}, err
+		}
+		if b[16] != ':' {
+			return time.Time{}, fmt.Errorf("bad value for field: `%c`", b[16])
+		}
+
+		sec, err := parseByte2Digits(b[17], b[18])
+		if err != nil {
+			return time.Time{}, err
+		}
+		if len(b) == 19 {
+			return time.Date(year, month, day, hour, min, sec, 0, loc), nil
+		}
+
+		if b[19] != '.' {
+			return time.Time{}, fmt.Errorf("bad value for field: `%c`", b[19])
+		}
+		nsec, err := parseByteNanoSec(b[20:])
+		if err != nil {
+			return time.Time{}, err
+		}
+		return time.Date(year, month, day, hour, min, sec, nsec, loc), nil
+	default:
+		return time.Time{}, fmt.Errorf("invalid time bytes: %s", b)
+	}
+}
+
+func parseByteYear(b []byte) (int, error) {
+	year, n := 0, 1000
+	for i := 0; i < 4; i++ {
+		v, err := bToi(b[i])
+		if err != nil {
+			return 0, err
+		}
+		year += v * n
+		n /= 10
+	}
+	return year, nil
+}
+
+func parseByte2Digits(b1, b2 byte) (int, error) {
+	d1, err := bToi(b1)
+	if err != nil {
+		return 0, err
+	}
+	d2, err := bToi(b2)
+	if err != nil {
+		return 0, err
+	}
+	return d1*10 + d2, nil
+}
+
+func parseByteNanoSec(b []byte) (int, error) {
+	ns, digit := 0, 100000 // max is 6-digits
+	for i := 0; i < len(b); i++ {
+		v, err := bToi(b[i])
+		if err != nil {
+			return 0, err
+		}
+		ns += v * digit
+		digit /= 10
+	}
+	// nanoseconds has 10-digits. (needs to scale digits)
+	// 10 - 6 = 4, so we have to multiple 1000.
+	return ns * 1000, nil
+}
+
+func bToi(b byte) (int, error) {
+	if b < '0' || b > '9' {
+		return 0, errors.New("not [0-9]")
+	}
+	return int(b - '0'), nil
+}
+
+func parseBinaryDateTime(num uint64, data []byte, loc *time.Location) (driver.Value, error) {
+	switch num {
+	case 0:
+		return time.Time{}, nil
+	case 4:
+		return time.Date(
+			int(binary.LittleEndian.Uint16(data[:2])), // year
+			time.Month(data[2]),                       // month
+			int(data[3]),                              // day
+			0, 0, 0, 0,
+			loc,
+		), nil
+	case 7:
+		return time.Date(
+			int(binary.LittleEndian.Uint16(data[:2])), // year
+			time.Month(data[2]),                       // month
+			int(data[3]),                              // day
+			int(data[4]),                              // hour
+			int(data[5]),                              // minutes
+			int(data[6]),                              // seconds
+			0,
+			loc,
+		), nil
+	case 11:
+		return time.Date(
+			int(binary.LittleEndian.Uint16(data[:2])), // year
+			time.Month(data[2]),                       // month
+			int(data[3]),                              // day
+			int(data[4]),                              // hour
+			int(data[5]),                              // minutes
+			int(data[6]),                              // seconds
+			int(binary.LittleEndian.Uint32(data[7:11]))*1000, // nanoseconds
+			loc,
+		), nil
+	}
+	return nil, fmt.Errorf("invalid DATETIME packet length %d", num)
+}
+
+func appendDateTime(buf []byte, t time.Time) ([]byte, error) {
+	year, month, day := t.Date()
+	hour, min, sec := t.Clock()
+	nsec := t.Nanosecond()
+
+	if year < 1 || year > 9999 {
+		return buf, errors.New("year is not in the range [1, 9999]: " + strconv.Itoa(year)) // use errors.New instead of fmt.Errorf to avoid year escape to heap
+	}
+	year100 := year / 100
+	year1 := year % 100
+
+	var localBuf [len("2006-01-02T15:04:05.999999999")]byte // does not escape
+	localBuf[0], localBuf[1], localBuf[2], localBuf[3] = digits10[year100], digits01[year100], digits10[year1], digits01[year1]
+	localBuf[4] = '-'
+	localBuf[5], localBuf[6] = digits10[month], digits01[month]
+	localBuf[7] = '-'
+	localBuf[8], localBuf[9] = digits10[day], digits01[day]
+
+	if hour == 0 && min == 0 && sec == 0 && nsec == 0 {
+		return append(buf, localBuf[:10]...), nil
+	}
+
+	localBuf[10] = ' '
+	localBuf[11], localBuf[12] = digits10[hour], digits01[hour]
+	localBuf[13] = ':'
+	localBuf[14], localBuf[15] = digits10[min], digits01[min]
+	localBuf[16] = ':'
+	localBuf[17], localBuf[18] = digits10[sec], digits01[sec]
+
+	if nsec == 0 {
+		return append(buf, localBuf[:19]...), nil
+	}
+	nsec100000000 := nsec / 100000000
+	nsec1000000 := (nsec / 1000000) % 100
+	nsec10000 := (nsec / 10000) % 100
+	nsec100 := (nsec / 100) % 100
+	nsec1 := nsec % 100
+	localBuf[19] = '.'
+
+	// milli second
+	localBuf[20], localBuf[21], localBuf[22] =
+		digits01[nsec100000000], digits10[nsec1000000], digits01[nsec1000000]
+	// micro second
+	localBuf[23], localBuf[24], localBuf[25] =
+		digits10[nsec10000], digits01[nsec10000], digits10[nsec100]
+	// nano second
+	localBuf[26], localBuf[27], localBuf[28] =
+		digits01[nsec100], digits10[nsec1], digits01[nsec1]
+
+	// trim trailing zeros
+	n := len(localBuf)
+	for n > 0 && localBuf[n-1] == '0' {
+		n--
+	}
+
+	return append(buf, localBuf[:n]...), nil
+}
+
+// zeroDateTime is used in formatBinaryDateTime to avoid an allocation
+// if the DATE or DATETIME has the zero value.
+// It must never be changed.
+// The current behavior depends on database/sql copying the result.
+var zeroDateTime = []byte("0000-00-00 00:00:00.000000")
+
+const digits01 = "0123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789"
+const digits10 = "0000000000111111111122222222223333333333444444444455555555556666666666777777777788888888889999999999"
+
+func appendMicrosecs(dst, src []byte, decimals int) []byte {
+	if decimals <= 0 {
+		return dst
+	}
+	if len(src) == 0 {
+		return append(dst, ".000000"[:decimals+1]...)
+	}
+
+	microsecs := binary.LittleEndian.Uint32(src[:4])
+	p1 := byte(microsecs / 10000)
+	microsecs -= 10000 * uint32(p1)
+	p2 := byte(microsecs / 100)
+	microsecs -= 100 * uint32(p2)
+	p3 := byte(microsecs)
+
+	switch decimals {
+	default:
+		return append(dst, '.',
+			digits10[p1], digits01[p1],
+			digits10[p2], digits01[p2],
+			digits10[p3], digits01[p3],
+		)
+	case 1:
+		return append(dst, '.',
+			digits10[p1],
+		)
+	case 2:
+		return append(dst, '.',
+			digits10[p1], digits01[p1],
+		)
+	case 3:
+		return append(dst, '.',
+			digits10[p1], digits01[p1],
+			digits10[p2],
+		)
+	case 4:
+		return append(dst, '.',
+			digits10[p1], digits01[p1],
+			digits10[p2], digits01[p2],
+		)
+	case 5:
+		return append(dst, '.',
+			digits10[p1], digits01[p1],
+			digits10[p2], digits01[p2],
+			digits10[p3],
+		)
+	}
+}
+
+func formatBinaryDateTime(src []byte, length uint8) (driver.Value, error) {
+	// length expects the deterministic length of the zero value,
+	// negative time and 100+ hours are automatically added if needed
+	if len(src) == 0 {
+		return zeroDateTime[:length], nil
+	}
+	var dst []byte      // return value
+	var p1, p2, p3 byte // current digit pair
+
+	switch length {
+	case 10, 19, 21, 22, 23, 24, 25, 26:
+	default:
+		t := "DATE"
+		if length > 10 {
+			t += "TIME"
+		}
+		return nil, fmt.Errorf("illegal %s length %d", t, length)
+	}
+	switch len(src) {
+	case 4, 7, 11:
+	default:
+		t := "DATE"
+		if length > 10 {
+			t += "TIME"
+		}
+		return nil, fmt.Errorf("illegal %s packet length %d", t, len(src))
+	}
+	dst = make([]byte, 0, length)
+	// start with the date
+	year := binary.LittleEndian.Uint16(src[:2])
+	pt := year / 100
+	p1 = byte(year - 100*uint16(pt))
+	p2, p3 = src[2], src[3]
+	dst = append(dst,
+		digits10[pt], digits01[pt],
+		digits10[p1], digits01[p1], '-',
+		digits10[p2], digits01[p2], '-',
+		digits10[p3], digits01[p3],
+	)
+	if length == 10 {
+		return dst, nil
+	}
+	if len(src) == 4 {
+		return append(dst, zeroDateTime[10:length]...), nil
+	}
+	dst = append(dst, ' ')
+	p1 = src[4] // hour
+	src = src[5:]
+
+	// p1 is 2-digit hour, src is after hour
+	p2, p3 = src[0], src[1]
+	dst = append(dst,
+		digits10[p1], digits01[p1], ':',
+		digits10[p2], digits01[p2], ':',
+		digits10[p3], digits01[p3],
+	)
+	return appendMicrosecs(dst, src[2:], int(length)-20), nil
+}
+
+func formatBinaryTime(src []byte, length uint8) (driver.Value, error) {
+	// length expects the deterministic length of the zero value,
+	// negative time and 100+ hours are automatically added if needed
+	if len(src) == 0 {
+		return zeroDateTime[11 : 11+length], nil
+	}
+	var dst []byte // return value
+
+	switch length {
+	case
+		8,                      // time (can be up to 10 when negative and 100+ hours)
+		10, 11, 12, 13, 14, 15: // time with fractional seconds
+	default:
+		return nil, fmt.Errorf("illegal TIME length %d", length)
+	}
+	switch len(src) {
+	case 8, 12:
+	default:
+		return nil, fmt.Errorf("invalid TIME packet length %d", len(src))
+	}
+	// +2 to enable negative time and 100+ hours
+	dst = make([]byte, 0, length+2)
+	if src[0] == 1 {
+		dst = append(dst, '-')
+	}
+	days := binary.LittleEndian.Uint32(src[1:5])
+	hours := int64(days)*24 + int64(src[5])
+
+	if hours >= 100 {
+		dst = strconv.AppendInt(dst, hours, 10)
+	} else {
+		dst = append(dst, digits10[hours], digits01[hours])
+	}
+
+	min, sec := src[6], src[7]
+	dst = append(dst, ':',
+		digits10[min], digits01[min], ':',
+		digits10[sec], digits01[sec],
+	)
+	return appendMicrosecs(dst, src[8:], int(length)-9), nil
+}
+
+/******************************************************************************
+*                       Convert from and to bytes                             *
+******************************************************************************/
+
+func uint64ToBytes(n uint64) []byte {
+	return []byte{
+		byte(n),
+		byte(n >> 8),
+		byte(n >> 16),
+		byte(n >> 24),
+		byte(n >> 32),
+		byte(n >> 40),
+		byte(n >> 48),
+		byte(n >> 56),
+	}
+}
+
+func uint64ToString(n uint64) []byte {
+	var a [20]byte
+	i := 20
+
+	// U+0030 = 0
+	// ...
+	// U+0039 = 9
+
+	var q uint64
+	for n >= 10 {
+		i--
+		q = n / 10
+		a[i] = uint8(n-q*10) + 0x30
+		n = q
+	}
+
+	i--
+	a[i] = uint8(n) + 0x30
+
+	return a[i:]
+}
+
+// treats string value as unsigned integer representation
+func stringToInt(b []byte) int {
+	val := 0
+	for i := range b {
+		val *= 10
+		val += int(b[i] - 0x30)
+	}
+	return val
+}
+
+// returns the string read as a bytes slice, whether the value is NULL,
+// the number of bytes read and an error, in case the string is longer than
+// the input slice
+func readLengthEncodedString(b []byte) ([]byte, bool, int, error) {
+	// Get length
+	num, isNull, n := readLengthEncodedInteger(b)
+	if num < 1 {
+		return b[n:n], isNull, n, nil
+	}
+
+	n += int(num)
+
+	// Check data length
+	if len(b) >= n {
+		return b[n-int(num) : n : n], false, n, nil
+	}
+	return nil, false, n, io.EOF
+}
+
+// returns the number of bytes skipped and an error, in case the string is
+// longer than the input slice
+func skipLengthEncodedString(b []byte) (int, error) {
+	// Get length
+	num, _, n := readLengthEncodedInteger(b)
+	if num < 1 {
+		return n, nil
+	}
+
+	n += int(num)
+
+	// Check data length
+	if len(b) >= n {
+		return n, nil
+	}
+	return n, io.EOF
+}
+
+// returns the number read, whether the value is NULL and the number of bytes read
+func readLengthEncodedInteger(b []byte) (uint64, bool, int) {
+	// See issue #349
+	if len(b) == 0 {
+		return 0, true, 1
+	}
+
+	switch b[0] {
+	// 251: NULL
+	case 0xfb:
+		return 0, true, 1
+
+	// 252: value of following 2
+	case 0xfc:
+		return uint64(b[1]) | uint64(b[2])<<8, false, 3
+
+	// 253: value of following 3
+	case 0xfd:
+		return uint64(b[1]) | uint64(b[2])<<8 | uint64(b[3])<<16, false, 4
+
+	// 254: value of following 8
+	case 0xfe:
+		return uint64(b[1]) | uint64(b[2])<<8 | uint64(b[3])<<16 |
+				uint64(b[4])<<24 | uint64(b[5])<<32 | uint64(b[6])<<40 |
+				uint64(b[7])<<48 | uint64(b[8])<<56,
+			false, 9
+	}
+
+	// 0-250: value of first byte
+	return uint64(b[0]), false, 1
+}
+
+// encodes a uint64 value and appends it to the given bytes slice
+func appendLengthEncodedInteger(b []byte, n uint64) []byte {
+	switch {
+	case n <= 250:
+		return append(b, byte(n))
+
+	case n <= 0xffff:
+		return append(b, 0xfc, byte(n), byte(n>>8))
+
+	case n <= 0xffffff:
+		return append(b, 0xfd, byte(n), byte(n>>8), byte(n>>16))
+	}
+	return append(b, 0xfe, byte(n), byte(n>>8), byte(n>>16), byte(n>>24),
+		byte(n>>32), byte(n>>40), byte(n>>48), byte(n>>56))
+}
+
+// reserveBuffer checks cap(buf) and expand buffer to len(buf) + appendSize.
+// If cap(buf) is not enough, reallocate new buffer.
+func reserveBuffer(buf []byte, appendSize int) []byte {
+	newSize := len(buf) + appendSize
+	if cap(buf) < newSize {
+		// Grow buffer exponentially
+		newBuf := make([]byte, len(buf)*2+appendSize)
+		copy(newBuf, buf)
+		buf = newBuf
+	}
+	return buf[:newSize]
+}
+
+// escapeBytesBackslash escapes []byte with backslashes (\)
+// This escapes the contents of a string (provided as []byte) by adding backslashes before special
+// characters, and turning others into specific escape sequences, such as
+// turning newlines into \n and null bytes into \0.
+// https://github.com/mysql/mysql-server/blob/mysql-5.7.5/mysys/charset.c#L823-L932
+func escapeBytesBackslash(buf, v []byte) []byte {
+	pos := len(buf)
+	buf = reserveBuffer(buf, len(v)*2)
+
+	for _, c := range v {
+		switch c {
+		case '\x00':
+			buf[pos+1] = '0'
+			buf[pos] = '\\'
+			pos += 2
+		case '\n':
+			buf[pos+1] = 'n'
+			buf[pos] = '\\'
+			pos += 2
+		case '\r':
+			buf[pos+1] = 'r'
+			buf[pos] = '\\'
+			pos += 2
+		case '\x1a':
+			buf[pos+1] = 'Z'
+			buf[pos] = '\\'
+			pos += 2
+		case '\'':
+			buf[pos+1] = '\''
+			buf[pos] = '\\'
+			pos += 2
+		case '"':
+			buf[pos+1] = '"'
+			buf[pos] = '\\'
+			pos += 2
+		case '\\':
+			buf[pos+1] = '\\'
+			buf[pos] = '\\'
+			pos += 2
+		default:
+			buf[pos] = c
+			pos++
+		}
+	}
+
+	return buf[:pos]
+}
+
+// escapeStringBackslash is similar to escapeBytesBackslash but for string.
+func escapeStringBackslash(buf []byte, v string) []byte {
+	pos := len(buf)
+	buf = reserveBuffer(buf, len(v)*2)
+
+	for i := 0; i < len(v); i++ {
+		c := v[i]
+		switch c {
+		case '\x00':
+			buf[pos+1] = '0'
+			buf[pos] = '\\'
+			pos += 2
+		case '\n':
+			buf[pos+1] = 'n'
+			buf[pos] = '\\'
+			pos += 2
+		case '\r':
+			buf[pos+1] = 'r'
+			buf[pos] = '\\'
+			pos += 2
+		case '\x1a':
+			buf[pos+1] = 'Z'
+			buf[pos] = '\\'
+			pos += 2
+		case '\'':
+			buf[pos+1] = '\''
+			buf[pos] = '\\'
+			pos += 2
+		case '"':
+			buf[pos+1] = '"'
+			buf[pos] = '\\'
+			pos += 2
+		case '\\':
+			buf[pos+1] = '\\'
+			buf[pos] = '\\'
+			pos += 2
+		default:
+			buf[pos] = c
+			pos++
+		}
+	}
+
+	return buf[:pos]
+}
+
+// escapeBytesQuotes escapes apostrophes in []byte by doubling them up.
+// This escapes the contents of a string by doubling up any apostrophes that
+// it contains. This is used when the NO_BACKSLASH_ESCAPES SQL_MODE is in
+// effect on the server.
+// https://github.com/mysql/mysql-server/blob/mysql-5.7.5/mysys/charset.c#L963-L1038
+func escapeBytesQuotes(buf, v []byte) []byte {
+	pos := len(buf)
+	buf = reserveBuffer(buf, len(v)*2)
+
+	for _, c := range v {
+		if c == '\'' {
+			buf[pos+1] = '\''
+			buf[pos] = '\''
+			pos += 2
+		} else {
+			buf[pos] = c
+			pos++
+		}
+	}
+
+	return buf[:pos]
+}
+
+// escapeStringQuotes is similar to escapeBytesQuotes but for string.
+func escapeStringQuotes(buf []byte, v string) []byte {
+	pos := len(buf)
+	buf = reserveBuffer(buf, len(v)*2)
+
+	for i := 0; i < len(v); i++ {
+		c := v[i]
+		if c == '\'' {
+			buf[pos+1] = '\''
+			buf[pos] = '\''
+			pos += 2
+		} else {
+			buf[pos] = c
+			pos++
+		}
+	}
+
+	return buf[:pos]
+}
+
+/******************************************************************************
+*                               Sync utils                                    *
+******************************************************************************/
+
+// noCopy may be embedded into structs which must not be copied
+// after the first use.
+//
+// See https://github.com/golang/go/issues/8005#issuecomment-190753527
+// for details.
+type noCopy struct{}
+
+// Lock is a no-op used by -copylocks checker from `go vet`.
+func (*noCopy) Lock() {}
+
+// Unlock is a no-op used by -copylocks checker from `go vet`.
+// noCopy should implement sync.Locker from Go 1.11
+// https://github.com/golang/go/commit/c2eba53e7f80df21d51285879d51ab81bcfbf6bc
+// https://github.com/golang/go/issues/26165
+func (*noCopy) Unlock() {}
+
+// atomicError is a wrapper for atomically accessed error values
+type atomicError struct {
+	_     noCopy
+	value atomic.Value
+}
+
+// Set sets the error value regardless of the previous value.
+// The value must not be nil
+func (ae *atomicError) Set(value error) {
+	ae.value.Store(value)
+}
+
+// Value returns the current error value
+func (ae *atomicError) Value() error {
+	if v := ae.value.Load(); v != nil {
+		// this will panic if the value doesn't implement the error interface
+		return v.(error)
+	}
+	return nil
+}
+
+func namedValueToValue(named []driver.NamedValue) ([]driver.Value, error) {
+	dargs := make([]driver.Value, len(named))
+	for n, param := range named {
+		if len(param.Name) > 0 {
+			// TODO: support the use of Named Parameters #561
+			return nil, errors.New("mysql: driver does not support the use of Named Parameters")
+		}
+		dargs[n] = param.Value
+	}
+	return dargs, nil
+}
+
+func mapIsolationLevel(level driver.IsolationLevel) (string, error) {
+	switch sql.IsolationLevel(level) {
+	case sql.LevelRepeatableRead:
+		return "REPEATABLE READ", nil
+	case sql.LevelReadCommitted:
+		return "READ COMMITTED", nil
+	case sql.LevelReadUncommitted:
+		return "READ UNCOMMITTED", nil
+	case sql.LevelSerializable:
+		return "SERIALIZABLE", nil
+	default:
+		return "", fmt.Errorf("mysql: unsupported isolation level: %v", level)
+	}
+}

vendor/github.com/google/uuid/.travis.yml

@@ -0,0 +1,9 @@
+language: go
+
+go:
+  - 1.4.3
+  - 1.5.3
+  - tip
+
+script:
+  - go test -v ./...

vendor/github.com/google/uuid/CONTRIBUTING.md

@@ -0,0 +1,10 @@
+# How to contribute
+
+We definitely welcome patches and contribution to this project!
+
+### Legal requirements
+
+In order to protect both you and ourselves, you will need to sign the
+[Contributor License Agreement](https://cla.developers.google.com/clas).
+
+You may have already signed it for other Google projects.

vendor/github.com/google/uuid/CONTRIBUTORS

@@ -0,0 +1,9 @@
+Paul Borman <borman@google.com>
+bmatsuo
+shawnps
+theory
+jboverfelt
+dsymonds
+cd1
+wallclockbuilder
+dansouza

vendor/github.com/google/uuid/LICENSE

@@ -0,0 +1,27 @@
+Copyright (c) 2009,2014 Google Inc. All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+
+   * Redistributions of source code must retain the above copyright
+notice, this list of conditions and the following disclaimer.
+   * Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the following disclaimer
+in the documentation and/or other materials provided with the
+distribution.
+   * Neither the name of Google Inc. nor the names of its
+contributors may be used to endorse or promote products derived from
+this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

vendor/github.com/google/uuid/README.md

@@ -0,0 +1,19 @@
+# uuid ![build status](https://travis-ci.org/google/uuid.svg?branch=master)
+The uuid package generates and inspects UUIDs based on
+[RFC 4122](http://tools.ietf.org/html/rfc4122)
+and DCE 1.1: Authentication and Security Services. 
+
+This package is based on the github.com/pborman/uuid package (previously named
+code.google.com/p/go-uuid).  It differs from these earlier packages in that
+a UUID is a 16 byte array rather than a byte slice.  One loss due to this
+change is the ability to represent an invalid UUID (vs a NIL UUID).
+
+###### Install
+`go get github.com/google/uuid`
+
+###### Documentation 
+[![GoDoc](https://godoc.org/github.com/google/uuid?status.svg)](http://godoc.org/github.com/google/uuid)
+
+Full `go doc` style documentation for the package can be viewed online without
+installing this package by using the GoDoc site here: 
+http://pkg.go.dev/github.com/google/uuid

vendor/github.com/google/uuid/dce.go

@@ -0,0 +1,80 @@
+// Copyright 2016 Google Inc.  All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package uuid
+
+import (
+	"encoding/binary"
+	"fmt"
+	"os"
+)
+
+// A Domain represents a Version 2 domain
+type Domain byte
+
+// Domain constants for DCE Security (Version 2) UUIDs.
+const (
+	Person = Domain(0)
+	Group  = Domain(1)
+	Org    = Domain(2)
+)
+
+// NewDCESecurity returns a DCE Security (Version 2) UUID.
+//
+// The domain should be one of Person, Group or Org.
+// On a POSIX system the id should be the users UID for the Person
+// domain and the users GID for the Group.  The meaning of id for
+// the domain Org or on non-POSIX systems is site defined.
+//
+// For a given domain/id pair the same token may be returned for up to
+// 7 minutes and 10 seconds.
+func NewDCESecurity(domain Domain, id uint32) (UUID, error) {
+	uuid, err := NewUUID()
+	if err == nil {
+		uuid[6] = (uuid[6] & 0x0f) | 0x20 // Version 2
+		uuid[9] = byte(domain)
+		binary.BigEndian.PutUint32(uuid[0:], id)
+	}
+	return uuid, err
+}
+
+// NewDCEPerson returns a DCE Security (Version 2) UUID in the person
+// domain with the id returned by os.Getuid.
+//
+//  NewDCESecurity(Person, uint32(os.Getuid()))
+func NewDCEPerson() (UUID, error) {
+	return NewDCESecurity(Person, uint32(os.Getuid()))
+}
+
+// NewDCEGroup returns a DCE Security (Version 2) UUID in the group
+// domain with the id returned by os.Getgid.
+//
+//  NewDCESecurity(Group, uint32(os.Getgid()))
+func NewDCEGroup() (UUID, error) {
+	return NewDCESecurity(Group, uint32(os.Getgid()))
+}
+
+// Domain returns the domain for a Version 2 UUID.  Domains are only defined
+// for Version 2 UUIDs.
+func (uuid UUID) Domain() Domain {
+	return Domain(uuid[9])
+}
+
+// ID returns the id for a Version 2 UUID. IDs are only defined for Version 2
+// UUIDs.
+func (uuid UUID) ID() uint32 {
+	return binary.BigEndian.Uint32(uuid[0:4])
+}
+
+func (d Domain) String() string {
+	switch d {
+	case Person:
+		return "Person"
+	case Group:
+		return "Group"
+	case Org:
+		return "Org"
+	}
+	return fmt.Sprintf("Domain%d", int(d))
+}

vendor/github.com/google/uuid/doc.go

@@ -0,0 +1,12 @@
+// Copyright 2016 Google Inc.  All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package uuid generates and inspects UUIDs.
+//
+// UUIDs are based on RFC 4122 and DCE 1.1: Authentication and Security
+// Services.
+//
+// A UUID is a 16 byte (128 bit) array.  UUIDs may be used as keys to
+// maps or compared directly.
+package uuid

vendor/github.com/google/uuid/hash.go

@@ -0,0 +1,53 @@
+// Copyright 2016 Google Inc.  All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package uuid
+
+import (
+	"crypto/md5"
+	"crypto/sha1"
+	"hash"
+)
+
+// Well known namespace IDs and UUIDs
+var (
+	NameSpaceDNS  = Must(Parse("6ba7b810-9dad-11d1-80b4-00c04fd430c8"))
+	NameSpaceURL  = Must(Parse("6ba7b811-9dad-11d1-80b4-00c04fd430c8"))
+	NameSpaceOID  = Must(Parse("6ba7b812-9dad-11d1-80b4-00c04fd430c8"))
+	NameSpaceX500 = Must(Parse("6ba7b814-9dad-11d1-80b4-00c04fd430c8"))
+	Nil           UUID // empty UUID, all zeros
+)
+
+// NewHash returns a new UUID derived from the hash of space concatenated with
+// data generated by h.  The hash should be at least 16 byte in length.  The
+// first 16 bytes of the hash are used to form the UUID.  The version of the
+// UUID will be the lower 4 bits of version.  NewHash is used to implement
+// NewMD5 and NewSHA1.
+func NewHash(h hash.Hash, space UUID, data []byte, version int) UUID {
+	h.Reset()
+	h.Write(space[:]) //nolint:errcheck
+	h.Write(data)     //nolint:errcheck
+	s := h.Sum(nil)
+	var uuid UUID
+	copy(uuid[:], s)
+	uuid[6] = (uuid[6] & 0x0f) | uint8((version&0xf)<<4)
+	uuid[8] = (uuid[8] & 0x3f) | 0x80 // RFC 4122 variant
+	return uuid
+}
+
+// NewMD5 returns a new MD5 (Version 3) UUID based on the
+// supplied name space and data.  It is the same as calling:
+//
+//  NewHash(md5.New(), space, data, 3)
+func NewMD5(space UUID, data []byte) UUID {
+	return NewHash(md5.New(), space, data, 3)
+}
+
+// NewSHA1 returns a new SHA1 (Version 5) UUID based on the
+// supplied name space and data.  It is the same as calling:
+//
+//  NewHash(sha1.New(), space, data, 5)
+func NewSHA1(space UUID, data []byte) UUID {
+	return NewHash(sha1.New(), space, data, 5)
+}

vendor/github.com/google/uuid/marshal.go

@@ -0,0 +1,38 @@
+// Copyright 2016 Google Inc.  All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package uuid
+
+import "fmt"
+
+// MarshalText implements encoding.TextMarshaler.
+func (uuid UUID) MarshalText() ([]byte, error) {
+	var js [36]byte
+	encodeHex(js[:], uuid)
+	return js[:], nil
+}
+
+// UnmarshalText implements encoding.TextUnmarshaler.
+func (uuid *UUID) UnmarshalText(data []byte) error {
+	id, err := ParseBytes(data)
+	if err != nil {
+		return err
+	}
+	*uuid = id
+	return nil
+}
+
+// MarshalBinary implements encoding.BinaryMarshaler.
+func (uuid UUID) MarshalBinary() ([]byte, error) {
+	return uuid[:], nil
+}
+
+// UnmarshalBinary implements encoding.BinaryUnmarshaler.
+func (uuid *UUID) UnmarshalBinary(data []byte) error {
+	if len(data) != 16 {
+		return fmt.Errorf("invalid UUID (got %d bytes)", len(data))
+	}
+	copy(uuid[:], data)
+	return nil
+}

vendor/github.com/google/uuid/node.go

@@ -0,0 +1,90 @@
+// Copyright 2016 Google Inc.  All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package uuid
+
+import (
+	"sync"
+)
+
+var (
+	nodeMu sync.Mutex
+	ifname string  // name of interface being used
+	nodeID [6]byte // hardware for version 1 UUIDs
+	zeroID [6]byte // nodeID with only 0's
+)
+
+// NodeInterface returns the name of the interface from which the NodeID was
+// derived.  The interface "user" is returned if the NodeID was set by
+// SetNodeID.
+func NodeInterface() string {
+	defer nodeMu.Unlock()
+	nodeMu.Lock()
+	return ifname
+}
+
+// SetNodeInterface selects the hardware address to be used for Version 1 UUIDs.
+// If name is "" then the first usable interface found will be used or a random
+// Node ID will be generated.  If a named interface cannot be found then false
+// is returned.
+//
+// SetNodeInterface never fails when name is "".
+func SetNodeInterface(name string) bool {
+	defer nodeMu.Unlock()
+	nodeMu.Lock()
+	return setNodeInterface(name)
+}
+
+func setNodeInterface(name string) bool {
+	iname, addr := getHardwareInterface(name) // null implementation for js
+	if iname != "" && addr != nil {
+		ifname = iname
+		copy(nodeID[:], addr)
+		return true
+	}
+
+	// We found no interfaces with a valid hardware address.  If name
+	// does not specify a specific interface generate a random Node ID
+	// (section 4.1.6)
+	if name == "" {
+		ifname = "random"
+		randomBits(nodeID[:])
+		return true
+	}
+	return false
+}
+
+// NodeID returns a slice of a copy of the current Node ID, setting the Node ID
+// if not already set.
+func NodeID() []byte {
+	defer nodeMu.Unlock()
+	nodeMu.Lock()
+	if nodeID == zeroID {
+		setNodeInterface("")
+	}
+	nid := nodeID
+	return nid[:]
+}
+
+// SetNodeID sets the Node ID to be used for Version 1 UUIDs.  The first 6 bytes
+// of id are used.  If id is less than 6 bytes then false is returned and the
+// Node ID is not set.
+func SetNodeID(id []byte) bool {
+	if len(id) < 6 {
+		return false
+	}
+	defer nodeMu.Unlock()
+	nodeMu.Lock()
+	copy(nodeID[:], id)
+	ifname = "user"
+	return true
+}
+
+// NodeID returns the 6 byte node id encoded in uuid.  It returns nil if uuid is
+// not valid.  The NodeID is only well defined for version 1 and 2 UUIDs.
+func (uuid UUID) NodeID() []byte {
+	var node [6]byte
+	copy(node[:], uuid[10:])
+	return node[:]
+}

vendor/github.com/google/uuid/node_js.go

@@ -0,0 +1,12 @@
+// Copyright 2017 Google Inc.  All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build js
+
+package uuid
+
+// getHardwareInterface returns nil values for the JS version of the code.
+// This remvoves the "net" dependency, because it is not used in the browser.
+// Using the "net" library inflates the size of the transpiled JS code by 673k bytes.
+func getHardwareInterface(name string) (string, []byte) { return "", nil }

vendor/github.com/google/uuid/node_net.go

@@ -0,0 +1,33 @@
+// Copyright 2017 Google Inc.  All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build !js
+
+package uuid
+
+import "net"
+
+var interfaces []net.Interface // cached list of interfaces
+
+// getHardwareInterface returns the name and hardware address of interface name.
+// If name is "" then the name and hardware address of one of the system's
+// interfaces is returned.  If no interfaces are found (name does not exist or
+// there are no interfaces) then "", nil is returned.
+//
+// Only addresses of at least 6 bytes are returned.
+func getHardwareInterface(name string) (string, []byte) {
+	if interfaces == nil {
+		var err error
+		interfaces, err = net.Interfaces()
+		if err != nil {
+			return "", nil
+		}
+	}
+	for _, ifs := range interfaces {
+		if len(ifs.HardwareAddr) >= 6 && (name == "" || name == ifs.Name) {
+			return ifs.Name, ifs.HardwareAddr
+		}
+	}
+	return "", nil
+}

vendor/github.com/google/uuid/null.go

@@ -0,0 +1,118 @@
+// Copyright 2021 Google Inc.  All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package uuid
+
+import (
+	"bytes"
+	"database/sql/driver"
+	"encoding/json"
+	"fmt"
+)
+
+var jsonNull = []byte("null")
+
+// NullUUID represents a UUID that may be null.
+// NullUUID implements the SQL driver.Scanner interface so
+// it can be used as a scan destination:
+//
+//  var u uuid.NullUUID
+//  err := db.QueryRow("SELECT name FROM foo WHERE id=?", id).Scan(&u)
+//  ...
+//  if u.Valid {
+//     // use u.UUID
+//  } else {
+//     // NULL value
+//  }
+//
+type NullUUID struct {
+	UUID  UUID
+	Valid bool // Valid is true if UUID is not NULL
+}
+
+// Scan implements the SQL driver.Scanner interface.
+func (nu *NullUUID) Scan(value interface{}) error {
+	if value == nil {
+		nu.UUID, nu.Valid = Nil, false
+		return nil
+	}
+
+	err := nu.UUID.Scan(value)
+	if err != nil {
+		nu.Valid = false
+		return err
+	}
+
+	nu.Valid = true
+	return nil
+}
+
+// Value implements the driver Valuer interface.
+func (nu NullUUID) Value() (driver.Value, error) {
+	if !nu.Valid {
+		return nil, nil
+	}
+	// Delegate to UUID Value function
+	return nu.UUID.Value()
+}
+
+// MarshalBinary implements encoding.BinaryMarshaler.
+func (nu NullUUID) MarshalBinary() ([]byte, error) {
+	if nu.Valid {
+		return nu.UUID[:], nil
+	}
+
+	return []byte(nil), nil
+}
+
+// UnmarshalBinary implements encoding.BinaryUnmarshaler.
+func (nu *NullUUID) UnmarshalBinary(data []byte) error {
+	if len(data) != 16 {
+		return fmt.Errorf("invalid UUID (got %d bytes)", len(data))
+	}
+	copy(nu.UUID[:], data)
+	nu.Valid = true
+	return nil
+}
+
+// MarshalText implements encoding.TextMarshaler.
+func (nu NullUUID) MarshalText() ([]byte, error) {
+	if nu.Valid {
+		return nu.UUID.MarshalText()
+	}
+
+	return jsonNull, nil
+}
+
+// UnmarshalText implements encoding.TextUnmarshaler.
+func (nu *NullUUID) UnmarshalText(data []byte) error {
+	id, err := ParseBytes(data)
+	if err != nil {
+		nu.Valid = false
+		return err
+	}
+	nu.UUID = id
+	nu.Valid = true
+	return nil
+}
+
+// MarshalJSON implements json.Marshaler.
+func (nu NullUUID) MarshalJSON() ([]byte, error) {
+	if nu.Valid {
+		return json.Marshal(nu.UUID)
+	}
+
+	return jsonNull, nil
+}
+
+// UnmarshalJSON implements json.Unmarshaler.
+func (nu *NullUUID) UnmarshalJSON(data []byte) error {
+	if bytes.Equal(data, jsonNull) {
+		*nu = NullUUID{}
+		return nil // valid null UUID
+	}
+	err := json.Unmarshal(data, &nu.UUID)
+	nu.Valid = err == nil
+	return err
+}

vendor/github.com/google/uuid/sql.go

@@ -0,0 +1,59 @@
+// Copyright 2016 Google Inc.  All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package uuid
+
+import (
+	"database/sql/driver"
+	"fmt"
+)
+
+// Scan implements sql.Scanner so UUIDs can be read from databases transparently.
+// Currently, database types that map to string and []byte are supported. Please
+// consult database-specific driver documentation for matching types.
+func (uuid *UUID) Scan(src interface{}) error {
+	switch src := src.(type) {
+	case nil:
+		return nil
+
+	case string:
+		// if an empty UUID comes from a table, we return a null UUID
+		if src == "" {
+			return nil
+		}
+
+		// see Parse for required string format
+		u, err := Parse(src)
+		if err != nil {
+			return fmt.Errorf("Scan: %v", err)
+		}
+
+		*uuid = u
+
+	case []byte:
+		// if an empty UUID comes from a table, we return a null UUID
+		if len(src) == 0 {
+			return nil
+		}
+
+		// assumes a simple slice of bytes if 16 bytes
+		// otherwise attempts to parse
+		if len(src) != 16 {
+			return uuid.Scan(string(src))
+		}
+		copy((*uuid)[:], src)
+
+	default:
+		return fmt.Errorf("Scan: unable to scan type %T into UUID", src)
+	}
+
+	return nil
+}
+
+// Value implements sql.Valuer so that UUIDs can be written to databases
+// transparently. Currently, UUIDs map to strings. Please consult
+// database-specific driver documentation for matching types.
+func (uuid UUID) Value() (driver.Value, error) {
+	return uuid.String(), nil
+}

vendor/github.com/google/uuid/time.go

@@ -0,0 +1,123 @@
+// Copyright 2016 Google Inc.  All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package uuid
+
+import (
+	"encoding/binary"
+	"sync"
+	"time"
+)
+
+// A Time represents a time as the number of 100's of nanoseconds since 15 Oct
+// 1582.
+type Time int64
+
+const (
+	lillian    = 2299160          // Julian day of 15 Oct 1582
+	unix       = 2440587          // Julian day of 1 Jan 1970
+	epoch      = unix - lillian   // Days between epochs
+	g1582      = epoch * 86400    // seconds between epochs
+	g1582ns100 = g1582 * 10000000 // 100s of a nanoseconds between epochs
+)
+
+var (
+	timeMu   sync.Mutex
+	lasttime uint64 // last time we returned
+	clockSeq uint16 // clock sequence for this run
+
+	timeNow = time.Now // for testing
+)
+
+// UnixTime converts t the number of seconds and nanoseconds using the Unix
+// epoch of 1 Jan 1970.
+func (t Time) UnixTime() (sec, nsec int64) {
+	sec = int64(t - g1582ns100)
+	nsec = (sec % 10000000) * 100
+	sec /= 10000000
+	return sec, nsec
+}
+
+// GetTime returns the current Time (100s of nanoseconds since 15 Oct 1582) and
+// clock sequence as well as adjusting the clock sequence as needed.  An error
+// is returned if the current time cannot be determined.
+func GetTime() (Time, uint16, error) {
+	defer timeMu.Unlock()
+	timeMu.Lock()
+	return getTime()
+}
+
+func getTime() (Time, uint16, error) {
+	t := timeNow()
+
+	// If we don't have a clock sequence already, set one.
+	if clockSeq == 0 {
+		setClockSequence(-1)
+	}
+	now := uint64(t.UnixNano()/100) + g1582ns100
+
+	// If time has gone backwards with this clock sequence then we
+	// increment the clock sequence
+	if now <= lasttime {
+		clockSeq = ((clockSeq + 1) & 0x3fff) | 0x8000
+	}
+	lasttime = now
+	return Time(now), clockSeq, nil
+}
+
+// ClockSequence returns the current clock sequence, generating one if not
+// already set.  The clock sequence is only used for Version 1 UUIDs.
+//
+// The uuid package does not use global static storage for the clock sequence or
+// the last time a UUID was generated.  Unless SetClockSequence is used, a new
+// random clock sequence is generated the first time a clock sequence is
+// requested by ClockSequence, GetTime, or NewUUID.  (section 4.2.1.1)
+func ClockSequence() int {
+	defer timeMu.Unlock()
+	timeMu.Lock()
+	return clockSequence()
+}
+
+func clockSequence() int {
+	if clockSeq == 0 {
+		setClockSequence(-1)
+	}
+	return int(clockSeq & 0x3fff)
+}
+
+// SetClockSequence sets the clock sequence to the lower 14 bits of seq.  Setting to
+// -1 causes a new sequence to be generated.
+func SetClockSequence(seq int) {
+	defer timeMu.Unlock()
+	timeMu.Lock()
+	setClockSequence(seq)
+}
+
+func setClockSequence(seq int) {
+	if seq == -1 {
+		var b [2]byte
+		randomBits(b[:]) // clock sequence
+		seq = int(b[0])<<8 | int(b[1])
+	}
+	oldSeq := clockSeq
+	clockSeq = uint16(seq&0x3fff) | 0x8000 // Set our variant
+	if oldSeq != clockSeq {
+		lasttime = 0
+	}
+}
+
+// Time returns the time in 100s of nanoseconds since 15 Oct 1582 encoded in
+// uuid.  The time is only defined for version 1 and 2 UUIDs.
+func (uuid UUID) Time() Time {
+	time := int64(binary.BigEndian.Uint32(uuid[0:4]))
+	time |= int64(binary.BigEndian.Uint16(uuid[4:6])) << 32
+	time |= int64(binary.BigEndian.Uint16(uuid[6:8])&0xfff) << 48
+	return Time(time)
+}
+
+// ClockSequence returns the clock sequence encoded in uuid.
+// The clock sequence is only well defined for version 1 and 2 UUIDs.
+func (uuid UUID) ClockSequence() int {
+	return int(binary.BigEndian.Uint16(uuid[8:10])) & 0x3fff
+}

vendor/github.com/google/uuid/util.go

@@ -0,0 +1,43 @@
+// Copyright 2016 Google Inc.  All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package uuid
+
+import (
+	"io"
+)
+
+// randomBits completely fills slice b with random data.
+func randomBits(b []byte) {
+	if _, err := io.ReadFull(rander, b); err != nil {
+		panic(err.Error()) // rand should never fail
+	}
+}
+
+// xvalues returns the value of a byte as a hexadecimal digit or 255.
+var xvalues = [256]byte{
+	255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
+	255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
+	255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
+	0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 255, 255, 255, 255, 255, 255,
+	255, 10, 11, 12, 13, 14, 15, 255, 255, 255, 255, 255, 255, 255, 255, 255,
+	255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
+	255, 10, 11, 12, 13, 14, 15, 255, 255, 255, 255, 255, 255, 255, 255, 255,
+	255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
+	255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
+	255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
+	255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
+	255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
+	255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
+	255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
+	255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
+	255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
+}
+
+// xtob converts hex characters x1 and x2 into a byte.
+func xtob(x1, x2 byte) (byte, bool) {
+	b1 := xvalues[x1]
+	b2 := xvalues[x2]
+	return (b1 << 4) | b2, b1 != 255 && b2 != 255
+}

vendor/github.com/google/uuid/uuid.go

@@ -0,0 +1,294 @@
+// Copyright 2018 Google Inc.  All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package uuid
+
+import (
+	"bytes"
+	"crypto/rand"
+	"encoding/hex"
+	"errors"
+	"fmt"
+	"io"
+	"strings"
+	"sync"
+)
+
+// A UUID is a 128 bit (16 byte) Universal Unique IDentifier as defined in RFC
+// 4122.
+type UUID [16]byte
+
+// A Version represents a UUID's version.
+type Version byte
+
+// A Variant represents a UUID's variant.
+type Variant byte
+
+// Constants returned by Variant.
+const (
+	Invalid   = Variant(iota) // Invalid UUID
+	RFC4122                   // The variant specified in RFC4122
+	Reserved                  // Reserved, NCS backward compatibility.
+	Microsoft                 // Reserved, Microsoft Corporation backward compatibility.
+	Future                    // Reserved for future definition.
+)
+
+const randPoolSize = 16 * 16
+
+var (
+	rander      = rand.Reader // random function
+	poolEnabled = false
+	poolMu      sync.Mutex
+	poolPos     = randPoolSize     // protected with poolMu
+	pool        [randPoolSize]byte // protected with poolMu
+)
+
+type invalidLengthError struct{ len int }
+
+func (err invalidLengthError) Error() string {
+	return fmt.Sprintf("invalid UUID length: %d", err.len)
+}
+
+// IsInvalidLengthError is matcher function for custom error invalidLengthError
+func IsInvalidLengthError(err error) bool {
+	_, ok := err.(invalidLengthError)
+	return ok
+}
+
+// Parse decodes s into a UUID or returns an error.  Both the standard UUID
+// forms of xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx and
+// urn:uuid:xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx are decoded as well as the
+// Microsoft encoding {xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx} and the raw hex
+// encoding: xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx.
+func Parse(s string) (UUID, error) {
+	var uuid UUID
+	switch len(s) {
+	// xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
+	case 36:
+
+	// urn:uuid:xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
+	case 36 + 9:
+		if strings.ToLower(s[:9]) != "urn:uuid:" {
+			return uuid, fmt.Errorf("invalid urn prefix: %q", s[:9])
+		}
+		s = s[9:]
+
+	// {xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx}
+	case 36 + 2:
+		s = s[1:]
+
+	// xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
+	case 32:
+		var ok bool
+		for i := range uuid {
+			uuid[i], ok = xtob(s[i*2], s[i*2+1])
+			if !ok {
+				return uuid, errors.New("invalid UUID format")
+			}
+		}
+		return uuid, nil
+	default:
+		return uuid, invalidLengthError{len(s)}
+	}
+	// s is now at least 36 bytes long
+	// it must be of the form  xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
+	if s[8] != '-' || s[13] != '-' || s[18] != '-' || s[23] != '-' {
+		return uuid, errors.New("invalid UUID format")
+	}
+	for i, x := range [16]int{
+		0, 2, 4, 6,
+		9, 11,
+		14, 16,
+		19, 21,
+		24, 26, 28, 30, 32, 34} {
+		v, ok := xtob(s[x], s[x+1])
+		if !ok {
+			return uuid, errors.New("invalid UUID format")
+		}
+		uuid[i] = v
+	}
+	return uuid, nil
+}
+
+// ParseBytes is like Parse, except it parses a byte slice instead of a string.
+func ParseBytes(b []byte) (UUID, error) {
+	var uuid UUID
+	switch len(b) {
+	case 36: // xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
+	case 36 + 9: // urn:uuid:xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
+		if !bytes.Equal(bytes.ToLower(b[:9]), []byte("urn:uuid:")) {
+			return uuid, fmt.Errorf("invalid urn prefix: %q", b[:9])
+		}
+		b = b[9:]
+	case 36 + 2: // {xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx}
+		b = b[1:]
+	case 32: // xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
+		var ok bool
+		for i := 0; i < 32; i += 2 {
+			uuid[i/2], ok = xtob(b[i], b[i+1])
+			if !ok {
+				return uuid, errors.New("invalid UUID format")
+			}
+		}
+		return uuid, nil
+	default:
+		return uuid, invalidLengthError{len(b)}
+	}
+	// s is now at least 36 bytes long
+	// it must be of the form  xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
+	if b[8] != '-' || b[13] != '-' || b[18] != '-' || b[23] != '-' {
+		return uuid, errors.New("invalid UUID format")
+	}
+	for i, x := range [16]int{
+		0, 2, 4, 6,
+		9, 11,
+		14, 16,
+		19, 21,
+		24, 26, 28, 30, 32, 34} {
+		v, ok := xtob(b[x], b[x+1])
+		if !ok {
+			return uuid, errors.New("invalid UUID format")
+		}
+		uuid[i] = v
+	}
+	return uuid, nil
+}
+
+// MustParse is like Parse but panics if the string cannot be parsed.
+// It simplifies safe initialization of global variables holding compiled UUIDs.
+func MustParse(s string) UUID {
+	uuid, err := Parse(s)
+	if err != nil {
+		panic(`uuid: Parse(` + s + `): ` + err.Error())
+	}
+	return uuid
+}
+
+// FromBytes creates a new UUID from a byte slice. Returns an error if the slice
+// does not have a length of 16. The bytes are copied from the slice.
+func FromBytes(b []byte) (uuid UUID, err error) {
+	err = uuid.UnmarshalBinary(b)
+	return uuid, err
+}
+
+// Must returns uuid if err is nil and panics otherwise.
+func Must(uuid UUID, err error) UUID {
+	if err != nil {
+		panic(err)
+	}
+	return uuid
+}
+
+// String returns the string form of uuid, xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
+// , or "" if uuid is invalid.
+func (uuid UUID) String() string {
+	var buf [36]byte
+	encodeHex(buf[:], uuid)
+	return string(buf[:])
+}
+
+// URN returns the RFC 2141 URN form of uuid,
+// urn:uuid:xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx,  or "" if uuid is invalid.
+func (uuid UUID) URN() string {
+	var buf [36 + 9]byte
+	copy(buf[:], "urn:uuid:")
+	encodeHex(buf[9:], uuid)
+	return string(buf[:])
+}
+
+func encodeHex(dst []byte, uuid UUID) {
+	hex.Encode(dst, uuid[:4])
+	dst[8] = '-'
+	hex.Encode(dst[9:13], uuid[4:6])
+	dst[13] = '-'
+	hex.Encode(dst[14:18], uuid[6:8])
+	dst[18] = '-'
+	hex.Encode(dst[19:23], uuid[8:10])
+	dst[23] = '-'
+	hex.Encode(dst[24:], uuid[10:])
+}
+
+// Variant returns the variant encoded in uuid.
+func (uuid UUID) Variant() Variant {
+	switch {
+	case (uuid[8] & 0xc0) == 0x80:
+		return RFC4122
+	case (uuid[8] & 0xe0) == 0xc0:
+		return Microsoft
+	case (uuid[8] & 0xe0) == 0xe0:
+		return Future
+	default:
+		return Reserved
+	}
+}
+
+// Version returns the version of uuid.
+func (uuid UUID) Version() Version {
+	return Version(uuid[6] >> 4)
+}
+
+func (v Version) String() string {
+	if v > 15 {
+		return fmt.Sprintf("BAD_VERSION_%d", v)
+	}
+	return fmt.Sprintf("VERSION_%d", v)
+}
+
+func (v Variant) String() string {
+	switch v {
+	case RFC4122:
+		return "RFC4122"
+	case Reserved:
+		return "Reserved"
+	case Microsoft:
+		return "Microsoft"
+	case Future:
+		return "Future"
+	case Invalid:
+		return "Invalid"
+	}
+	return fmt.Sprintf("BadVariant%d", int(v))
+}
+
+// SetRand sets the random number generator to r, which implements io.Reader.
+// If r.Read returns an error when the package requests random data then
+// a panic will be issued.
+//
+// Calling SetRand with nil sets the random number generator to the default
+// generator.
+func SetRand(r io.Reader) {
+	if r == nil {
+		rander = rand.Reader
+		return
+	}
+	rander = r
+}
+
+// EnableRandPool enables internal randomness pool used for Random
+// (Version 4) UUID generation. The pool contains random bytes read from
+// the random number generator on demand in batches. Enabling the pool
+// may improve the UUID generation throughput significantly.
+//
+// Since the pool is stored on the Go heap, this feature may be a bad fit
+// for security sensitive applications.
+//
+// Both EnableRandPool and DisableRandPool are not thread-safe and should
+// only be called when there is no possibility that New or any other
+// UUID Version 4 generation function will be called concurrently.
+func EnableRandPool() {
+	poolEnabled = true
+}
+
+// DisableRandPool disables the randomness pool if it was previously
+// enabled with EnableRandPool.
+//
+// Both EnableRandPool and DisableRandPool are not thread-safe and should
+// only be called when there is no possibility that New or any other
+// UUID Version 4 generation function will be called concurrently.
+func DisableRandPool() {
+	poolEnabled = false
+	defer poolMu.Unlock()
+	poolMu.Lock()
+	poolPos = randPoolSize
+}

vendor/github.com/google/uuid/version1.go

@@ -0,0 +1,44 @@
+// Copyright 2016 Google Inc.  All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package uuid
+
+import (
+	"encoding/binary"
+)
+
+// NewUUID returns a Version 1 UUID based on the current NodeID and clock
+// sequence, and the current time.  If the NodeID has not been set by SetNodeID
+// or SetNodeInterface then it will be set automatically.  If the NodeID cannot
+// be set NewUUID returns nil.  If clock sequence has not been set by
+// SetClockSequence then it will be set automatically.  If GetTime fails to
+// return the current NewUUID returns nil and an error.
+//
+// In most cases, New should be used.
+func NewUUID() (UUID, error) {
+	var uuid UUID
+	now, seq, err := GetTime()
+	if err != nil {
+		return uuid, err
+	}
+
+	timeLow := uint32(now & 0xffffffff)
+	timeMid := uint16((now >> 32) & 0xffff)
+	timeHi := uint16((now >> 48) & 0x0fff)
+	timeHi |= 0x1000 // Version 1
+
+	binary.BigEndian.PutUint32(uuid[0:], timeLow)
+	binary.BigEndian.PutUint16(uuid[4:], timeMid)
+	binary.BigEndian.PutUint16(uuid[6:], timeHi)
+	binary.BigEndian.PutUint16(uuid[8:], seq)
+
+	nodeMu.Lock()
+	if nodeID == zeroID {
+		setNodeInterface("")
+	}
+	copy(uuid[10:], nodeID[:])
+	nodeMu.Unlock()
+
+	return uuid, nil
+}

vendor/github.com/google/uuid/version4.go

@@ -0,0 +1,76 @@
+// Copyright 2016 Google Inc.  All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package uuid
+
+import "io"
+
+// New creates a new random UUID or panics.  New is equivalent to
+// the expression
+//
+//    uuid.Must(uuid.NewRandom())
+func New() UUID {
+	return Must(NewRandom())
+}
+
+// NewString creates a new random UUID and returns it as a string or panics.
+// NewString is equivalent to the expression
+//
+//    uuid.New().String()
+func NewString() string {
+	return Must(NewRandom()).String()
+}
+
+// NewRandom returns a Random (Version 4) UUID.
+//
+// The strength of the UUIDs is based on the strength of the crypto/rand
+// package.
+//
+// Uses the randomness pool if it was enabled with EnableRandPool.
+//
+// A note about uniqueness derived from the UUID Wikipedia entry:
+//
+//  Randomly generated UUIDs have 122 random bits.  One's annual risk of being
+//  hit by a meteorite is estimated to be one chance in 17 billion, that
+//  means the probability is about 0.00000000006 (6 × 10−11),
+//  equivalent to the odds of creating a few tens of trillions of UUIDs in a
+//  year and having one duplicate.
+func NewRandom() (UUID, error) {
+	if !poolEnabled {
+		return NewRandomFromReader(rander)
+	}
+	return newRandomFromPool()
+}
+
+// NewRandomFromReader returns a UUID based on bytes read from a given io.Reader.
+func NewRandomFromReader(r io.Reader) (UUID, error) {
+	var uuid UUID
+	_, err := io.ReadFull(r, uuid[:])
+	if err != nil {
+		return Nil, err
+	}
+	uuid[6] = (uuid[6] & 0x0f) | 0x40 // Version 4
+	uuid[8] = (uuid[8] & 0x3f) | 0x80 // Variant is 10
+	return uuid, nil
+}
+
+func newRandomFromPool() (UUID, error) {
+	var uuid UUID
+	poolMu.Lock()
+	if poolPos == randPoolSize {
+		_, err := io.ReadFull(rander, pool[:])
+		if err != nil {
+			poolMu.Unlock()
+			return Nil, err
+		}
+		poolPos = 0
+	}
+	copy(uuid[:], pool[poolPos:(poolPos+16)])
+	poolPos += 16
+	poolMu.Unlock()
+
+	uuid[6] = (uuid[6] & 0x0f) | 0x40 // Version 4
+	uuid[8] = (uuid[8] & 0x3f) | 0x80 // Variant is 10
+	return uuid, nil
+}

vendor/github.com/joho/godotenv/.gitignore

@@ -0,0 +1 @@
+.DS_Store

vendor/github.com/joho/godotenv/LICENCE

@@ -0,0 +1,23 @@
+Copyright (c) 2013 John Barton
+
+MIT License
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the
+"Software"), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+

vendor/github.com/joho/godotenv/README.md

@@ -0,0 +1,202 @@
+# GoDotEnv ![CI](https://github.com/joho/godotenv/workflows/CI/badge.svg) [![Go Report Card](https://goreportcard.com/badge/github.com/joho/godotenv)](https://goreportcard.com/report/github.com/joho/godotenv)
+
+A Go (golang) port of the Ruby [dotenv](https://github.com/bkeepers/dotenv) project (which loads env vars from a .env file).
+
+From the original Library:
+
+> Storing configuration in the environment is one of the tenets of a twelve-factor app. Anything that is likely to change between deployment environments–such as resource handles for databases or credentials for external services–should be extracted from the code into environment variables.
+>
+> But it is not always practical to set environment variables on development machines or continuous integration servers where multiple projects are run. Dotenv load variables from a .env file into ENV when the environment is bootstrapped.
+
+It can be used as a library (for loading in env for your own daemons etc.) or as a bin command.
+
+There is test coverage and CI for both linuxish and Windows environments, but I make no guarantees about the bin version working on Windows.
+
+## Installation
+
+As a library
+
+```shell
+go get github.com/joho/godotenv
+```
+
+or if you want to use it as a bin command
+
+go >= 1.17
+```shell
+go install github.com/joho/godotenv/cmd/godotenv@latest
+```
+
+go < 1.17
+```shell
+go get github.com/joho/godotenv/cmd/godotenv
+```
+
+## Usage
+
+Add your application configuration to your `.env` file in the root of your project:
+
+```shell
+S3_BUCKET=YOURS3BUCKET
+SECRET_KEY=YOURSECRETKEYGOESHERE
+```
+
+Then in your Go app you can do something like
+
+```go
+package main
+
+import (
+    "log"
+    "os"
+
+    "github.com/joho/godotenv"
+)
+
+func main() {
+  err := godotenv.Load()
+  if err != nil {
+    log.Fatal("Error loading .env file")
+  }
+
+  s3Bucket := os.Getenv("S3_BUCKET")
+  secretKey := os.Getenv("SECRET_KEY")
+
+  // now do something with s3 or whatever
+}
+```
+
+If you're even lazier than that, you can just take advantage of the autoload package which will read in `.env` on import
+
+```go
+import _ "github.com/joho/godotenv/autoload"
+```
+
+While `.env` in the project root is the default, you don't have to be constrained, both examples below are 100% legit
+
+```go
+godotenv.Load("somerandomfile")
+godotenv.Load("filenumberone.env", "filenumbertwo.env")
+```
+
+If you want to be really fancy with your env file you can do comments and exports (below is a valid env file)
+
+```shell
+# I am a comment and that is OK
+SOME_VAR=someval
+FOO=BAR # comments at line end are OK too
+export BAR=BAZ
+```
+
+Or finally you can do YAML(ish) style
+
+```yaml
+FOO: bar
+BAR: baz
+```
+
+as a final aside, if you don't want godotenv munging your env you can just get a map back instead
+
+```go
+var myEnv map[string]string
+myEnv, err := godotenv.Read()
+
+s3Bucket := myEnv["S3_BUCKET"]
+```
+
+... or from an `io.Reader` instead of a local file
+
+```go
+reader := getRemoteFile()
+myEnv, err := godotenv.Parse(reader)
+```
+
+... or from a `string` if you so desire
+
+```go
+content := getRemoteFileContent()
+myEnv, err := godotenv.Unmarshal(content)
+```
+
+### Precedence & Conventions
+
+Existing envs take precedence of envs that are loaded later.
+
+The [convention](https://github.com/bkeepers/dotenv#what-other-env-files-can-i-use)
+for managing multiple environments (i.e. development, test, production)
+is to create an env named `{YOURAPP}_ENV` and load envs in this order:
+
+```go
+env := os.Getenv("FOO_ENV")
+if "" == env {
+  env = "development"
+}
+
+godotenv.Load(".env." + env + ".local")
+if "test" != env {
+  godotenv.Load(".env.local")
+}
+godotenv.Load(".env." + env)
+godotenv.Load() // The Original .env
+```
+
+If you need to, you can also use `godotenv.Overload()` to defy this convention
+and overwrite existing envs instead of only supplanting them. Use with caution.
+
+### Command Mode
+
+Assuming you've installed the command as above and you've got `$GOPATH/bin` in your `$PATH`
+
+```
+godotenv -f /some/path/to/.env some_command with some args
+```
+
+If you don't specify `-f` it will fall back on the default of loading `.env` in `PWD`
+
+By default, it won't override existing environment variables; you can do that with the `-o` flag.
+
+### Writing Env Files
+
+Godotenv can also write a map representing the environment to a correctly-formatted and escaped file
+
+```go
+env, err := godotenv.Unmarshal("KEY=value")
+err := godotenv.Write(env, "./.env")
+```
+
+... or to a string
+
+```go
+env, err := godotenv.Unmarshal("KEY=value")
+content, err := godotenv.Marshal(env)
+```
+
+## Contributing
+
+Contributions are welcome, but with some caveats.
+
+This library has been declared feature complete (see [#182](https://github.com/joho/godotenv/issues/182) for background) and will not be accepting issues or pull requests adding new functionality or breaking the library API.
+
+Contributions would be gladly accepted that:
+
+* bring this library's parsing into closer compatibility with the mainline dotenv implementations, in particular [Ruby's dotenv](https://github.com/bkeepers/dotenv) and [Node.js' dotenv](https://github.com/motdotla/dotenv)
+* keep the library up to date with the go ecosystem (ie CI bumps, documentation changes, changes in the core libraries)
+* bug fixes for use cases that pertain to the library's purpose of easing development of codebases deployed into twelve factor environments
+
+*code changes without tests and references to peer dotenv implementations will not be accepted*
+
+1. Fork it
+2. Create your feature branch (`git checkout -b my-new-feature`)
+3. Commit your changes (`git commit -am 'Added some feature'`)
+4. Push to the branch (`git push origin my-new-feature`)
+5. Create new Pull Request
+
+## Releases
+
+Releases should follow [Semver](http://semver.org/) though the first couple of releases are `v1` and `v1.1`.
+
+Use [annotated tags for all releases](https://github.com/joho/godotenv/issues/30). Example `git tag -a v1.2.1`
+
+## Who?
+
+The original library [dotenv](https://github.com/bkeepers/dotenv) was written by [Brandon Keepers](http://opensoul.org/), and this port was done by [John Barton](https://johnbarton.co/) based off the tests/fixtures in the original library.

vendor/github.com/joho/godotenv/godotenv.go

@@ -0,0 +1,228 @@
+// Package godotenv is a go port of the ruby dotenv library (https://github.com/bkeepers/dotenv)
+//
+// Examples/readme can be found on the GitHub page at https://github.com/joho/godotenv
+//
+// The TL;DR is that you make a .env file that looks something like
+//
+//	SOME_ENV_VAR=somevalue
+//
+// and then in your go code you can call
+//
+//	godotenv.Load()
+//
+// and all the env vars declared in .env will be available through os.Getenv("SOME_ENV_VAR")
+package godotenv
+
+import (
+	"bytes"
+	"fmt"
+	"io"
+	"os"
+	"os/exec"
+	"sort"
+	"strconv"
+	"strings"
+)
+
+const doubleQuoteSpecialChars = "\\\n\r\"!$`"
+
+// Parse reads an env file from io.Reader, returning a map of keys and values.
+func Parse(r io.Reader) (map[string]string, error) {
+	var buf bytes.Buffer
+	_, err := io.Copy(&buf, r)
+	if err != nil {
+		return nil, err
+	}
+
+	return UnmarshalBytes(buf.Bytes())
+}
+
+// Load will read your env file(s) and load them into ENV for this process.
+//
+// Call this function as close as possible to the start of your program (ideally in main).
+//
+// If you call Load without any args it will default to loading .env in the current path.
+//
+// You can otherwise tell it which files to load (there can be more than one) like:
+//
+//	godotenv.Load("fileone", "filetwo")
+//
+// It's important to note that it WILL NOT OVERRIDE an env variable that already exists - consider the .env file to set dev vars or sensible defaults.
+func Load(filenames ...string) (err error) {
+	filenames = filenamesOrDefault(filenames)
+
+	for _, filename := range filenames {
+		err = loadFile(filename, false)
+		if err != nil {
+			return // return early on a spazout
+		}
+	}
+	return
+}
+
+// Overload will read your env file(s) and load them into ENV for this process.
+//
+// Call this function as close as possible to the start of your program (ideally in main).
+//
+// If you call Overload without any args it will default to loading .env in the current path.
+//
+// You can otherwise tell it which files to load (there can be more than one) like:
+//
+//	godotenv.Overload("fileone", "filetwo")
+//
+// It's important to note this WILL OVERRIDE an env variable that already exists - consider the .env file to forcefully set all vars.
+func Overload(filenames ...string) (err error) {
+	filenames = filenamesOrDefault(filenames)
+
+	for _, filename := range filenames {
+		err = loadFile(filename, true)
+		if err != nil {
+			return // return early on a spazout
+		}
+	}
+	return
+}
+
+// Read all env (with same file loading semantics as Load) but return values as
+// a map rather than automatically writing values into env
+func Read(filenames ...string) (envMap map[string]string, err error) {
+	filenames = filenamesOrDefault(filenames)
+	envMap = make(map[string]string)
+
+	for _, filename := range filenames {
+		individualEnvMap, individualErr := readFile(filename)
+
+		if individualErr != nil {
+			err = individualErr
+			return // return early on a spazout
+		}
+
+		for key, value := range individualEnvMap {
+			envMap[key] = value
+		}
+	}
+
+	return
+}
+
+// Unmarshal reads an env file from a string, returning a map of keys and values.
+func Unmarshal(str string) (envMap map[string]string, err error) {
+	return UnmarshalBytes([]byte(str))
+}
+
+// UnmarshalBytes parses env file from byte slice of chars, returning a map of keys and values.
+func UnmarshalBytes(src []byte) (map[string]string, error) {
+	out := make(map[string]string)
+	err := parseBytes(src, out)
+
+	return out, err
+}
+
+// Exec loads env vars from the specified filenames (empty map falls back to default)
+// then executes the cmd specified.
+//
+// Simply hooks up os.Stdin/err/out to the command and calls Run().
+//
+// If you want more fine grained control over your command it's recommended
+// that you use `Load()`, `Overload()` or `Read()` and the `os/exec` package yourself.
+func Exec(filenames []string, cmd string, cmdArgs []string, overload bool) error {
+	op := Load
+	if overload {
+		op = Overload
+	}
+	if err := op(filenames...); err != nil {
+		return err
+	}
+
+	command := exec.Command(cmd, cmdArgs...)
+	command.Stdin = os.Stdin
+	command.Stdout = os.Stdout
+	command.Stderr = os.Stderr
+	return command.Run()
+}
+
+// Write serializes the given environment and writes it to a file.
+func Write(envMap map[string]string, filename string) error {
+	content, err := Marshal(envMap)
+	if err != nil {
+		return err
+	}
+	file, err := os.Create(filename)
+	if err != nil {
+		return err
+	}
+	defer file.Close()
+	_, err = file.WriteString(content + "\n")
+	if err != nil {
+		return err
+	}
+	return file.Sync()
+}
+
+// Marshal outputs the given environment as a dotenv-formatted environment file.
+// Each line is in the format: KEY="VALUE" where VALUE is backslash-escaped.
+func Marshal(envMap map[string]string) (string, error) {
+	lines := make([]string, 0, len(envMap))
+	for k, v := range envMap {
+		if d, err := strconv.Atoi(v); err == nil {
+			lines = append(lines, fmt.Sprintf(`%s=%d`, k, d))
+		} else {
+			lines = append(lines, fmt.Sprintf(`%s="%s"`, k, doubleQuoteEscape(v)))
+		}
+	}
+	sort.Strings(lines)
+	return strings.Join(lines, "\n"), nil
+}
+
+func filenamesOrDefault(filenames []string) []string {
+	if len(filenames) == 0 {
+		return []string{".env"}
+	}
+	return filenames
+}
+
+func loadFile(filename string, overload bool) error {
+	envMap, err := readFile(filename)
+	if err != nil {
+		return err
+	}
+
+	currentEnv := map[string]bool{}
+	rawEnv := os.Environ()
+	for _, rawEnvLine := range rawEnv {
+		key := strings.Split(rawEnvLine, "=")[0]
+		currentEnv[key] = true
+	}
+
+	for key, value := range envMap {
+		if !currentEnv[key] || overload {
+			_ = os.Setenv(key, value)
+		}
+	}
+
+	return nil
+}
+
+func readFile(filename string) (envMap map[string]string, err error) {
+	file, err := os.Open(filename)
+	if err != nil {
+		return
+	}
+	defer file.Close()
+
+	return Parse(file)
+}
+
+func doubleQuoteEscape(line string) string {
+	for _, c := range doubleQuoteSpecialChars {
+		toReplace := "\\" + string(c)
+		if c == '\n' {
+			toReplace = `\n`
+		}
+		if c == '\r' {
+			toReplace = `\r`
+		}
+		line = strings.Replace(line, string(c), toReplace, -1)
+	}
+	return line
+}

vendor/github.com/joho/godotenv/parser.go

@@ -0,0 +1,271 @@
+package godotenv
+
+import (
+	"bytes"
+	"errors"
+	"fmt"
+	"regexp"
+	"strings"
+	"unicode"
+)
+
+const (
+	charComment       = '#'
+	prefixSingleQuote = '\''
+	prefixDoubleQuote = '"'
+
+	exportPrefix = "export"
+)
+
+func parseBytes(src []byte, out map[string]string) error {
+	src = bytes.Replace(src, []byte("\r\n"), []byte("\n"), -1)
+	cutset := src
+	for {
+		cutset = getStatementStart(cutset)
+		if cutset == nil {
+			// reached end of file
+			break
+		}
+
+		key, left, err := locateKeyName(cutset)
+		if err != nil {
+			return err
+		}
+
+		value, left, err := extractVarValue(left, out)
+		if err != nil {
+			return err
+		}
+
+		out[key] = value
+		cutset = left
+	}
+
+	return nil
+}
+
+// getStatementPosition returns position of statement begin.
+//
+// It skips any comment line or non-whitespace character.
+func getStatementStart(src []byte) []byte {
+	pos := indexOfNonSpaceChar(src)
+	if pos == -1 {
+		return nil
+	}
+
+	src = src[pos:]
+	if src[0] != charComment {
+		return src
+	}
+
+	// skip comment section
+	pos = bytes.IndexFunc(src, isCharFunc('\n'))
+	if pos == -1 {
+		return nil
+	}
+
+	return getStatementStart(src[pos:])
+}
+
+// locateKeyName locates and parses key name and returns rest of slice
+func locateKeyName(src []byte) (key string, cutset []byte, err error) {
+	// trim "export" and space at beginning
+	src = bytes.TrimLeftFunc(src, isSpace)
+	if bytes.HasPrefix(src, []byte(exportPrefix)) {
+		trimmed := bytes.TrimPrefix(src, []byte(exportPrefix))
+		if bytes.IndexFunc(trimmed, isSpace) == 0 {
+			src = bytes.TrimLeftFunc(trimmed, isSpace)
+		}
+	}
+
+	// locate key name end and validate it in single loop
+	offset := 0
+loop:
+	for i, char := range src {
+		rchar := rune(char)
+		if isSpace(rchar) {
+			continue
+		}
+
+		switch char {
+		case '=', ':':
+			// library also supports yaml-style value declaration
+			key = string(src[0:i])
+			offset = i + 1
+			break loop
+		case '_':
+		default:
+			// variable name should match [A-Za-z0-9_.]
+			if unicode.IsLetter(rchar) || unicode.IsNumber(rchar) || rchar == '.' {
+				continue
+			}
+
+			return "", nil, fmt.Errorf(
+				`unexpected character %q in variable name near %q`,
+				string(char), string(src))
+		}
+	}
+
+	if len(src) == 0 {
+		return "", nil, errors.New("zero length string")
+	}
+
+	// trim whitespace
+	key = strings.TrimRightFunc(key, unicode.IsSpace)
+	cutset = bytes.TrimLeftFunc(src[offset:], isSpace)
+	return key, cutset, nil
+}
+
+// extractVarValue extracts variable value and returns rest of slice
+func extractVarValue(src []byte, vars map[string]string) (value string, rest []byte, err error) {
+	quote, hasPrefix := hasQuotePrefix(src)
+	if !hasPrefix {
+		// unquoted value - read until end of line
+		endOfLine := bytes.IndexFunc(src, isLineEnd)
+
+		// Hit EOF without a trailing newline
+		if endOfLine == -1 {
+			endOfLine = len(src)
+
+			if endOfLine == 0 {
+				return "", nil, nil
+			}
+		}
+
+		// Convert line to rune away to do accurate countback of runes
+		line := []rune(string(src[0:endOfLine]))
+
+		// Assume end of line is end of var
+		endOfVar := len(line)
+		if endOfVar == 0 {
+			return "", src[endOfLine:], nil
+		}
+
+		// Work backwards to check if the line ends in whitespace then
+		// a comment (ie asdasd # some comment)
+		for i := endOfVar - 1; i >= 0; i-- {
+			if line[i] == charComment && i > 0 {
+				if isSpace(line[i-1]) {
+					endOfVar = i
+					break
+				}
+			}
+		}
+
+		trimmed := strings.TrimFunc(string(line[0:endOfVar]), isSpace)
+
+		return expandVariables(trimmed, vars), src[endOfLine:], nil
+	}
+
+	// lookup quoted string terminator
+	for i := 1; i < len(src); i++ {
+		if char := src[i]; char != quote {
+			continue
+		}
+
+		// skip escaped quote symbol (\" or \', depends on quote)
+		if prevChar := src[i-1]; prevChar == '\\' {
+			continue
+		}
+
+		// trim quotes
+		trimFunc := isCharFunc(rune(quote))
+		value = string(bytes.TrimLeftFunc(bytes.TrimRightFunc(src[0:i], trimFunc), trimFunc))
+		if quote == prefixDoubleQuote {
+			// unescape newlines for double quote (this is compat feature)
+			// and expand environment variables
+			value = expandVariables(expandEscapes(value), vars)
+		}
+
+		return value, src[i+1:], nil
+	}
+
+	// return formatted error if quoted string is not terminated
+	valEndIndex := bytes.IndexFunc(src, isCharFunc('\n'))
+	if valEndIndex == -1 {
+		valEndIndex = len(src)
+	}
+
+	return "", nil, fmt.Errorf("unterminated quoted value %s", src[:valEndIndex])
+}
+
+func expandEscapes(str string) string {
+	out := escapeRegex.ReplaceAllStringFunc(str, func(match string) string {
+		c := strings.TrimPrefix(match, `\`)
+		switch c {
+		case "n":
+			return "\n"
+		case "r":
+			return "\r"
+		default:
+			return match
+		}
+	})
+	return unescapeCharsRegex.ReplaceAllString(out, "$1")
+}
+
+func indexOfNonSpaceChar(src []byte) int {
+	return bytes.IndexFunc(src, func(r rune) bool {
+		return !unicode.IsSpace(r)
+	})
+}
+
+// hasQuotePrefix reports whether charset starts with single or double quote and returns quote character
+func hasQuotePrefix(src []byte) (prefix byte, isQuored bool) {
+	if len(src) == 0 {
+		return 0, false
+	}
+
+	switch prefix := src[0]; prefix {
+	case prefixDoubleQuote, prefixSingleQuote:
+		return prefix, true
+	default:
+		return 0, false
+	}
+}
+
+func isCharFunc(char rune) func(rune) bool {
+	return func(v rune) bool {
+		return v == char
+	}
+}
+
+// isSpace reports whether the rune is a space character but not line break character
+//
+// this differs from unicode.IsSpace, which also applies line break as space
+func isSpace(r rune) bool {
+	switch r {
+	case '\t', '\v', '\f', '\r', ' ', 0x85, 0xA0:
+		return true
+	}
+	return false
+}
+
+func isLineEnd(r rune) bool {
+	if r == '\n' || r == '\r' {
+		return true
+	}
+	return false
+}
+
+var (
+	escapeRegex        = regexp.MustCompile(`\\.`)
+	expandVarRegex     = regexp.MustCompile(`(\\)?(\$)(\()?\{?([A-Z0-9_]+)?\}?`)
+	unescapeCharsRegex = regexp.MustCompile(`\\([^$])`)
+)
+
+func expandVariables(v string, m map[string]string) string {
+	return expandVarRegex.ReplaceAllStringFunc(v, func(s string) string {
+		submatch := expandVarRegex.FindStringSubmatch(s)
+
+		if submatch == nil {
+			return s
+		}
+		if submatch[1] == "\\" || submatch[2] == "(" {
+			return submatch[0][1:]
+		} else if submatch[4] != "" {
+			return m[submatch[4]]
+		}
+		return s
+	})
+}

vendor/modules.txt

@@ -0,0 +1,15 @@
+# github.com/go-chi/chi v1.5.4
+## explicit; go 1.16
+github.com/go-chi/chi
+# github.com/go-chi/cors v1.2.1
+## explicit; go 1.14
+github.com/go-chi/cors
+# github.com/go-sql-driver/mysql v1.7.1
+## explicit; go 1.13
+github.com/go-sql-driver/mysql
+# github.com/google/uuid v1.3.0
+## explicit
+github.com/google/uuid
+# github.com/joho/godotenv v1.5.1
+## explicit; go 1.12
+github.com/joho/godotenv