From 5a7fac748b9a6ec78a2c7a571d075c2991b937a5 Mon Sep 17 00:00:00 2001
From: Darius Rapalis <info@rdarius.lt>
Date: Tue, 11 Mar 2025 12:41:15 +0200
Subject: [PATCH] #6 - fetch feed

---
 internal/handlers/fetchFeedHandler.go | 30 ++++++++++++++
 internal/rss/rss.go                   | 57 +++++++++++++++++++++++++++
 main.go                               |  1 +
 3 files changed, 88 insertions(+)
 create mode 100644 internal/handlers/fetchFeedHandler.go
 create mode 100644 internal/rss/rss.go

diff --git a/internal/handlers/fetchFeedHandler.go b/internal/handlers/fetchFeedHandler.go
new file mode 100644
index 0000000..048dc5a
--- /dev/null
+++ b/internal/handlers/fetchFeedHandler.go
@@ -0,0 +1,30 @@
+package handlers
+
+import (
+	"context"
+	"fmt"
+	"github.com/rdarius/boot-dev-blog-aggregator/internal/config"
+	"github.com/rdarius/boot-dev-blog-aggregator/internal/rss"
+	"os"
+)
+
+func FetchFeedHandler(s *config.State, cmd config.Command) error {
+	var feedUrl string
+	if len(cmd.Args) < 1 {
+		feedUrl = "https://www.wagslane.dev/index.xml"
+	} else {
+		feedUrl = cmd.Args[0]
+	}
+
+	ctx := context.Background()
+
+	feed, err := rss.FetchFeed(ctx, feedUrl)
+	if err != nil {
+		fmt.Println("Failed to fetch feed")
+		os.Exit(1)
+	}
+
+	fmt.Printf("%v", feed)
+
+	return nil
+}
diff --git a/internal/rss/rss.go b/internal/rss/rss.go
new file mode 100644
index 0000000..d2962a7
--- /dev/null
+++ b/internal/rss/rss.go
@@ -0,0 +1,57 @@
+package rss
+
+import (
+	"context"
+	"encoding/xml"
+	"html"
+	"io"
+	"net/http"
+)
+
+type Feed struct {
+	Channel struct {
+		Title       string `xml:"title"`
+		Link        string `xml:"link"`
+		Description string `xml:"description"`
+		Item        []Item `xml:"item"`
+	} `xml:"channel"`
+}
+
+type Item struct {
+	Title       string `xml:"title"`
+	Link        string `xml:"link"`
+	Description string `xml:"description"`
+	PubDate     string `xml:"pubDate"`
+}
+
+func FetchFeed(ctx context.Context, feedURL string) (*Feed, error) {
+	req, err := http.NewRequestWithContext(ctx, "GET", feedURL, nil)
+	if err != nil {
+		return nil, err
+	}
+	req.Header.Set("User-Agent", "gator")
+	resp, err := http.DefaultClient.Do(req)
+	if err != nil {
+		return nil, err
+	}
+	defer resp.Body.Close()
+	res, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return nil, err
+	}
+	var feed Feed
+	err = xml.Unmarshal(res, &feed)
+	if err != nil {
+		return nil, err
+	}
+	feed.Channel.Title = html.UnescapeString(feed.Channel.Title)
+	feed.Channel.Link = html.UnescapeString(feed.Channel.Link)
+	feed.Channel.Description = html.UnescapeString(feed.Channel.Description)
+	for i, _ := range feed.Channel.Item {
+		feed.Channel.Item[i].Link = html.UnescapeString(feed.Channel.Item[i].Link)
+		feed.Channel.Item[i].Description = html.UnescapeString(feed.Channel.Item[i].Description)
+		feed.Channel.Item[i].PubDate = html.UnescapeString(feed.Channel.Item[i].PubDate)
+		feed.Channel.Item[i].Title = html.UnescapeString(feed.Channel.Item[i].Title)
+	}
+	return &feed, nil
+}
diff --git a/main.go b/main.go
index 6a03d95..96a6a04 100644
--- a/main.go
+++ b/main.go
@@ -35,6 +35,7 @@ func main() {
 	commands.Register("register", handlers.RegisterHandler)
 	commands.Register("reset", handlers.ResetUsersHandler)
 	commands.Register("users", handlers.GetUsersHandler)
+	commands.Register("agg", handlers.FetchFeedHandler)
 
 	if len(os.Args) < 2 {
 		log.Fatal("usage: boot-dev-blog-aggregator <command> [args...]")