chore: add project dependencies and configuration files
Initial setup of project dependencies including axios, express, dotenv, and other supporting packages. Added configuration files and documentation for project setup and usage.
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238
node_modules/cors/lib/index.js
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238
node_modules/cors/lib/index.js
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(function () {
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'use strict';
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var assign = require('object-assign');
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var vary = require('vary');
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var defaults = {
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origin: '*',
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methods: 'GET,HEAD,PUT,PATCH,POST,DELETE',
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preflightContinue: false,
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optionsSuccessStatus: 204
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};
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function isString(s) {
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return typeof s === 'string' || s instanceof String;
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}
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function isOriginAllowed(origin, allowedOrigin) {
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if (Array.isArray(allowedOrigin)) {
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for (var i = 0; i < allowedOrigin.length; ++i) {
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if (isOriginAllowed(origin, allowedOrigin[i])) {
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return true;
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}
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}
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return false;
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} else if (isString(allowedOrigin)) {
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return origin === allowedOrigin;
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} else if (allowedOrigin instanceof RegExp) {
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return allowedOrigin.test(origin);
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} else {
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return !!allowedOrigin;
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}
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}
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function configureOrigin(options, req) {
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var requestOrigin = req.headers.origin,
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headers = [],
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isAllowed;
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if (!options.origin || options.origin === '*') {
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// allow any origin
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headers.push([{
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key: 'Access-Control-Allow-Origin',
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value: '*'
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}]);
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} else if (isString(options.origin)) {
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// fixed origin
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headers.push([{
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key: 'Access-Control-Allow-Origin',
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value: options.origin
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}]);
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headers.push([{
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key: 'Vary',
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value: 'Origin'
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}]);
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} else {
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isAllowed = isOriginAllowed(requestOrigin, options.origin);
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// reflect origin
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headers.push([{
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key: 'Access-Control-Allow-Origin',
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value: isAllowed ? requestOrigin : false
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}]);
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headers.push([{
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key: 'Vary',
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value: 'Origin'
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}]);
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}
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return headers;
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}
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function configureMethods(options) {
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var methods = options.methods;
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if (methods.join) {
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methods = options.methods.join(','); // .methods is an array, so turn it into a string
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}
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return {
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key: 'Access-Control-Allow-Methods',
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value: methods
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};
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}
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function configureCredentials(options) {
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if (options.credentials === true) {
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return {
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key: 'Access-Control-Allow-Credentials',
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value: 'true'
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};
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}
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return null;
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}
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function configureAllowedHeaders(options, req) {
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var allowedHeaders = options.allowedHeaders || options.headers;
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var headers = [];
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if (!allowedHeaders) {
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allowedHeaders = req.headers['access-control-request-headers']; // .headers wasn't specified, so reflect the request headers
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headers.push([{
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key: 'Vary',
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value: 'Access-Control-Request-Headers'
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}]);
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} else if (allowedHeaders.join) {
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allowedHeaders = allowedHeaders.join(','); // .headers is an array, so turn it into a string
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}
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if (allowedHeaders && allowedHeaders.length) {
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headers.push([{
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key: 'Access-Control-Allow-Headers',
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value: allowedHeaders
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}]);
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}
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return headers;
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}
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function configureExposedHeaders(options) {
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var headers = options.exposedHeaders;
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if (!headers) {
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return null;
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} else if (headers.join) {
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headers = headers.join(','); // .headers is an array, so turn it into a string
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}
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if (headers && headers.length) {
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return {
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key: 'Access-Control-Expose-Headers',
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value: headers
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};
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}
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return null;
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}
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function configureMaxAge(options) {
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var maxAge = (typeof options.maxAge === 'number' || options.maxAge) && options.maxAge.toString()
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if (maxAge && maxAge.length) {
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return {
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key: 'Access-Control-Max-Age',
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value: maxAge
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};
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}
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return null;
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}
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function applyHeaders(headers, res) {
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for (var i = 0, n = headers.length; i < n; i++) {
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var header = headers[i];
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if (header) {
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if (Array.isArray(header)) {
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applyHeaders(header, res);
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} else if (header.key === 'Vary' && header.value) {
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vary(res, header.value);
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} else if (header.value) {
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res.setHeader(header.key, header.value);
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}
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}
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}
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}
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function cors(options, req, res, next) {
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var headers = [],
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method = req.method && req.method.toUpperCase && req.method.toUpperCase();
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if (method === 'OPTIONS') {
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// preflight
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headers.push(configureOrigin(options, req));
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headers.push(configureCredentials(options, req));
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headers.push(configureMethods(options, req));
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headers.push(configureAllowedHeaders(options, req));
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headers.push(configureMaxAge(options, req));
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headers.push(configureExposedHeaders(options, req));
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applyHeaders(headers, res);
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if (options.preflightContinue) {
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next();
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} else {
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// Safari (and potentially other browsers) need content-length 0,
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// for 204 or they just hang waiting for a body
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res.statusCode = options.optionsSuccessStatus;
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res.setHeader('Content-Length', '0');
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res.end();
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}
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} else {
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// actual response
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headers.push(configureOrigin(options, req));
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headers.push(configureCredentials(options, req));
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headers.push(configureExposedHeaders(options, req));
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applyHeaders(headers, res);
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next();
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}
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}
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function middlewareWrapper(o) {
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// if options are static (either via defaults or custom options passed in), wrap in a function
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var optionsCallback = null;
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if (typeof o === 'function') {
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optionsCallback = o;
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} else {
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optionsCallback = function (req, cb) {
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cb(null, o);
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};
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}
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return function corsMiddleware(req, res, next) {
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optionsCallback(req, function (err, options) {
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if (err) {
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next(err);
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} else {
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var corsOptions = assign({}, defaults, options);
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var originCallback = null;
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if (corsOptions.origin && typeof corsOptions.origin === 'function') {
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originCallback = corsOptions.origin;
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} else if (corsOptions.origin) {
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originCallback = function (origin, cb) {
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cb(null, corsOptions.origin);
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};
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}
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if (originCallback) {
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originCallback(req.headers.origin, function (err2, origin) {
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if (err2 || !origin) {
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next(err2);
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} else {
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corsOptions.origin = origin;
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cors(corsOptions, req, res, next);
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}
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});
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} else {
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next();
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}
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}
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});
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};
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}
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// can pass either an options hash, an options delegate, or nothing
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module.exports = middlewareWrapper;
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}());
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