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@ -0,0 +1,462 @@
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// © 2013 - 2016 Rob Wu <rob@robwu.nl>
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// Released under the MIT license
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'use strict';
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var httpProxy = require('http-proxy');
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var net = require('net');
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var url = require('url');
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var regexp_tld = require('./regexp-top-level-domain');
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var getProxyForUrl = require('proxy-from-env').getProxyForUrl;
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var help_text = {};
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function showUsage(help_file, headers, response) {
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var isHtml = /\.html$/.test(help_file);
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headers['content-type'] = isHtml ? 'text/html' : 'text/plain';
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if (help_text[help_file] != null) {
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response.writeHead(200, headers);
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response.end(help_text[help_file]);
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} else {
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require('fs').readFile(help_file, 'utf8', function(err, data) {
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if (err) {
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console.error(err);
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response.writeHead(500, headers);
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response.end();
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} else {
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help_text[help_file] = data;
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showUsage(help_file, headers, response); // Recursive call, but since data is a string, the recursion will end
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}
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});
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}
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}
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/**
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* Check whether the specified hostname is valid.
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*
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* @param hostname {string} Host name (excluding port) of requested resource.
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* @return {boolean} Whether the requested resource can be accessed.
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*/
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function isValidHostName(hostname) {
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return !!(
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regexp_tld.test(hostname) ||
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net.isIPv4(hostname) ||
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net.isIPv6(hostname)
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);
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}
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/**
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* Adds CORS headers to the response headers.
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*
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* @param headers {object} Response headers
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* @param request {ServerRequest}
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*/
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function withCORS(headers, request) {
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headers['access-control-allow-origin'] = '*';
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var corsMaxAge = request.corsAnywhereRequestState.corsMaxAge;
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if (request.method === 'OPTIONS' && corsMaxAge) {
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headers['access-control-max-age'] = corsMaxAge;
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}
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if (request.headers['access-control-request-method']) {
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headers['access-control-allow-methods'] = request.headers['access-control-request-method'];
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delete request.headers['access-control-request-method'];
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}
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if (request.headers['access-control-request-headers']) {
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headers['access-control-allow-headers'] = request.headers['access-control-request-headers'];
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delete request.headers['access-control-request-headers'];
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}
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headers['access-control-expose-headers'] = Object.keys(headers).join(',');
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return headers;
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}
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/**
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* Performs the actual proxy request.
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*
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* @param req {ServerRequest} Incoming http request
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* @param res {ServerResponse} Outgoing (proxied) http request
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* @param proxy {HttpProxy}
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*/
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function proxyRequest(req, res, proxy) {
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var location = req.corsAnywhereRequestState.location;
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req.url = location.path;
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var proxyOptions = {
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changeOrigin: false,
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prependPath: false,
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target: location,
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headers: {
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host: location.host,
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},
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// HACK: Get hold of the proxyReq object, because we need it later.
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// https://github.com/nodejitsu/node-http-proxy/blob/v1.11.1/lib/http-proxy/passes/web-incoming.js#L144
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buffer: {
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pipe: function(proxyReq) {
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var proxyReqOn = proxyReq.on;
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// Intercepts the handler that connects proxyRes to res.
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// https://github.com/nodejitsu/node-http-proxy/blob/v1.11.1/lib/http-proxy/passes/web-incoming.js#L146-L158
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proxyReq.on = function(eventName, listener) {
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if (eventName !== 'response') {
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return proxyReqOn.call(this, eventName, listener);
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}
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return proxyReqOn.call(this, 'response', function(proxyRes) {
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if (onProxyResponse(proxy, proxyReq, proxyRes, req, res)) {
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try {
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listener(proxyRes);
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} catch (err) {
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// Wrap in try-catch because an error could occur:
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// "RangeError: Invalid status code: 0"
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// https://github.com/Rob--W/cors-anywhere/issues/95
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// https://github.com/nodejitsu/node-http-proxy/issues/1080
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// Forward error (will ultimately emit the 'error' event on our proxy object):
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// https://github.com/nodejitsu/node-http-proxy/blob/v1.11.1/lib/http-proxy/passes/web-incoming.js#L134
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proxyReq.emit('error', err);
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}
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}
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});
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};
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return req.pipe(proxyReq);
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},
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},
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};
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var proxyThroughUrl = req.corsAnywhereRequestState.getProxyForUrl(location.href);
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if (proxyThroughUrl) {
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proxyOptions.target = proxyThroughUrl;
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proxyOptions.toProxy = true;
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// If a proxy URL was set, req.url must be an absolute URL. Then the request will not be sent
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// directly to the proxied URL, but through another proxy.
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req.url = location.href;
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}
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// Start proxying the request
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try {
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proxy.web(req, res, proxyOptions);
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} catch (err) {
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proxy.emit('error', err, req, res);
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}
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}
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/**
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* This method modifies the response headers of the proxied response.
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* If a redirect is detected, the response is not sent to the client,
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* and a new request is initiated.
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*
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* client (req) -> CORS Anywhere -> (proxyReq) -> other server
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* client (res) <- CORS Anywhere <- (proxyRes) <- other server
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*
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* @param proxy {HttpProxy}
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* @param proxyReq {ClientRequest} The outgoing request to the other server.
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* @param proxyRes {ServerResponse} The response from the other server.
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* @param req {IncomingMessage} Incoming HTTP request, augmented with property corsAnywhereRequestState
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* @param req.corsAnywhereRequestState {object}
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* @param req.corsAnywhereRequestState.location {object} See parseURL
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* @param req.corsAnywhereRequestState.getProxyForUrl {function} See proxyRequest
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* @param req.corsAnywhereRequestState.proxyBaseUrl {string} Base URL of the CORS API endpoint
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* @param req.corsAnywhereRequestState.maxRedirects {number} Maximum number of redirects
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* @param req.corsAnywhereRequestState.redirectCount_ {number} Internally used to count redirects
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* @param res {ServerResponse} Outgoing response to the client that wanted to proxy the HTTP request.
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*
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* @returns {boolean} true if http-proxy should continue to pipe proxyRes to res.
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*/
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function onProxyResponse(proxy, proxyReq, proxyRes, req, res) {
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var requestState = req.corsAnywhereRequestState;
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var statusCode = proxyRes.statusCode;
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if (!requestState.redirectCount_) {
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res.setHeader('x-request-url', requestState.location.href);
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}
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// Handle redirects
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if (statusCode === 301 || statusCode === 302 || statusCode === 303 || statusCode === 307 || statusCode === 308) {
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var locationHeader = proxyRes.headers.location;
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var parsedLocation;
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if (locationHeader) {
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locationHeader = url.resolve(requestState.location.href, locationHeader);
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parsedLocation = parseURL(locationHeader);
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}
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if (parsedLocation) {
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if (statusCode === 301 || statusCode === 302 || statusCode === 303) {
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// Exclude 307 & 308, because they are rare, and require preserving the method + request body
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requestState.redirectCount_ = requestState.redirectCount_ + 1 || 1;
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if (requestState.redirectCount_ <= requestState.maxRedirects) {
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// Handle redirects within the server, because some clients (e.g. Android Stock Browser)
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// cancel redirects.
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// Set header for debugging purposes. Do not try to parse it!
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res.setHeader('X-CORS-Redirect-' + requestState.redirectCount_, statusCode + ' ' + locationHeader);
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req.method = 'GET';
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req.headers['content-length'] = '0';
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delete req.headers['content-type'];
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requestState.location = parsedLocation;
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// Remove all listeners (=reset events to initial state)
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req.removeAllListeners();
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// Remove the error listener so that the ECONNRESET "error" that
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// may occur after aborting a request does not propagate to res.
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// https://github.com/nodejitsu/node-http-proxy/blob/v1.11.1/lib/http-proxy/passes/web-incoming.js#L134
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proxyReq.removeAllListeners('error');
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proxyReq.once('error', function catchAndIgnoreError() {});
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proxyReq.abort();
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// Initiate a new proxy request.
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proxyRequest(req, res, proxy);
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return false;
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}
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}
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proxyRes.headers.location = requestState.proxyBaseUrl + '/' + locationHeader;
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}
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}
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// Strip cookies
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delete proxyRes.headers['set-cookie'];
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delete proxyRes.headers['set-cookie2'];
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proxyRes.headers['x-final-url'] = requestState.location.href;
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withCORS(proxyRes.headers, req);
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return true;
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}
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/**
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* @param req_url {string} The requested URL (scheme is optional).
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* @return {object} URL parsed using url.parse
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*/
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function parseURL(req_url) {
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var match = req_url.match(/^(?:(https?:)?\/\/)?(([^\/?]+?)(?::(\d{0,5})(?=[\/?]|$))?)([\/?][\S\s]*|$)/i);
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// ^^^^^^^ ^^^^^^^^ ^^^^^^^ ^^^^^^^^^^^^
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// 1:protocol 3:hostname 4:port 5:path + query string
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// ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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// 2:host
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if (!match) {
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return null;
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}
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if (!match[1]) {
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if (/^https?:/i.test(req_url)) {
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// The pattern at top could mistakenly parse "http:///" as host="http:" and path=///.
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return null;
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}
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// Scheme is omitted.
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if (req_url.lastIndexOf('//', 0) === -1) {
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// "//" is omitted.
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req_url = '//' + req_url;
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}
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req_url = (match[4] === '443' ? 'https:' : 'http:') + req_url;
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}
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var parsed = url.parse(req_url);
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if (!parsed.hostname) {
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// "http://:1/" and "http:/notenoughslashes" could end up here.
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return null;
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}
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return parsed;
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}
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// Request handler factory
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function getHandler(options, proxy) {
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var corsAnywhere = {
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handleInitialRequest: null, // Function that may handle the request instead, by returning a truthy value.
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getProxyForUrl: getProxyForUrl, // Function that specifies the proxy to use
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maxRedirects: 5, // Maximum number of redirects to be followed.
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originBlacklist: [], // Requests from these origins will be blocked.
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originWhitelist: [], // If non-empty, requests not from an origin in this list will be blocked.
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checkRateLimit: null, // Function that may enforce a rate-limit by returning a non-empty string.
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redirectSameOrigin: false, // Redirect the client to the requested URL for same-origin requests.
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requireHeader: null, // Require a header to be set?
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removeHeaders: [], // Strip these request headers.
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setHeaders: {}, // Set these request headers.
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corsMaxAge: 0, // If set, an Access-Control-Max-Age header with this value (in seconds) will be added.
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helpFile: __dirname + '/help.txt',
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};
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Object.keys(corsAnywhere).forEach(function(option) {
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if (Object.prototype.hasOwnProperty.call(options, option)) {
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corsAnywhere[option] = options[option];
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}
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});
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// Convert corsAnywhere.requireHeader to an array of lowercase header names, or null.
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if (corsAnywhere.requireHeader) {
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if (typeof corsAnywhere.requireHeader === 'string') {
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corsAnywhere.requireHeader = [corsAnywhere.requireHeader.toLowerCase()];
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} else if (!Array.isArray(corsAnywhere.requireHeader) || corsAnywhere.requireHeader.length === 0) {
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corsAnywhere.requireHeader = null;
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} else {
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corsAnywhere.requireHeader = corsAnywhere.requireHeader.map(function(headerName) {
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return headerName.toLowerCase();
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});
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}
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}
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var hasRequiredHeaders = function(headers) {
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return !corsAnywhere.requireHeader || corsAnywhere.requireHeader.some(function(headerName) {
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return Object.hasOwnProperty.call(headers, headerName);
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});
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};
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return function(req, res) {
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req.corsAnywhereRequestState = {
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getProxyForUrl: corsAnywhere.getProxyForUrl,
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maxRedirects: corsAnywhere.maxRedirects,
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corsMaxAge: corsAnywhere.corsMaxAge,
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};
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var cors_headers = withCORS({}, req);
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if (req.method === 'OPTIONS') {
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// Pre-flight request. Reply successfully:
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res.writeHead(200, cors_headers);
|
|
|
|
|
res.end();
|
|
|
|
|
return;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
var location = parseURL(req.url.slice(1));
|
|
|
|
|
|
|
|
|
|
if (corsAnywhere.handleInitialRequest && corsAnywhere.handleInitialRequest(req, res, location)) {
|
|
|
|
|
return;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
if (!location) {
|
|
|
|
|
// Special case http:/notenoughslashes, because new users of the library frequently make the
|
|
|
|
|
// mistake of putting this application behind a server/router that normalizes the URL.
|
|
|
|
|
// See https://github.com/Rob--W/cors-anywhere/issues/238#issuecomment-629638853
|
|
|
|
|
if (/^\/https?:\/[^/]/i.test(req.url)) {
|
|
|
|
|
res.writeHead(400, 'Missing slash', cors_headers);
|
|
|
|
|
res.end('The URL is invalid: two slashes are needed after the http(s):.');
|
|
|
|
|
return;
|
|
|
|
|
}
|
|
|
|
|
// Invalid API call. Show how to correctly use the API
|
|
|
|
|
showUsage(corsAnywhere.helpFile, cors_headers, res);
|
|
|
|
|
return;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
if (location.host === 'iscorsneeded') {
|
|
|
|
|
// Is CORS needed? This path is provided so that API consumers can test whether it's necessary
|
|
|
|
|
// to use CORS. The server's reply is always No, because if they can read it, then CORS headers
|
|
|
|
|
// are not necessary.
|
|
|
|
|
res.writeHead(200, {'Content-Type': 'text/plain'});
|
|
|
|
|
res.end('no');
|
|
|
|
|
return;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
if (location.port > 65535) {
|
|
|
|
|
// Port is higher than 65535
|
|
|
|
|
res.writeHead(400, 'Invalid port', cors_headers);
|
|
|
|
|
res.end('Port number too large: ' + location.port);
|
|
|
|
|
return;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
if (!/^\/https?:/.test(req.url) && !isValidHostName(location.hostname)) {
|
|
|
|
|
// Don't even try to proxy invalid hosts (such as /favicon.ico, /robots.txt)
|
|
|
|
|
res.writeHead(404, 'Invalid host', cors_headers);
|
|
|
|
|
res.end('Invalid host: ' + location.hostname);
|
|
|
|
|
return;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
if (!hasRequiredHeaders(req.headers)) {
|
|
|
|
|
res.writeHead(400, 'Header required', cors_headers);
|
|
|
|
|
res.end('Missing required request header. Must specify one of: ' + corsAnywhere.requireHeader);
|
|
|
|
|
return;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
var origin = req.headers.origin || '';
|
|
|
|
|
if (corsAnywhere.originBlacklist.indexOf(origin) >= 0) {
|
|
|
|
|
res.writeHead(403, 'Forbidden', cors_headers);
|
|
|
|
|
res.end('The origin "' + origin + '" was blacklisted by the operator of this proxy.');
|
|
|
|
|
return;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
if (corsAnywhere.originWhitelist.length && corsAnywhere.originWhitelist.indexOf(origin) === -1) {
|
|
|
|
|
res.writeHead(403, 'Forbidden', cors_headers);
|
|
|
|
|
res.end('The origin "' + origin + '" was not whitelisted by the operator of this proxy.');
|
|
|
|
|
return;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
var rateLimitMessage = corsAnywhere.checkRateLimit && corsAnywhere.checkRateLimit(origin);
|
|
|
|
|
if (rateLimitMessage) {
|
|
|
|
|
res.writeHead(429, 'Too Many Requests', cors_headers);
|
|
|
|
|
res.end('The origin "' + origin + '" has sent too many requests.\n' + rateLimitMessage);
|
|
|
|
|
return;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
if (corsAnywhere.redirectSameOrigin && origin && location.href[origin.length] === '/' &&
|
|
|
|
|
location.href.lastIndexOf(origin, 0) === 0) {
|
|
|
|
|
// Send a permanent redirect to offload the server. Badly coded clients should not waste our resources.
|
|
|
|
|
cors_headers.vary = 'origin';
|
|
|
|
|
cors_headers['cache-control'] = 'private';
|
|
|
|
|
cors_headers.location = location.href;
|
|
|
|
|
res.writeHead(301, 'Please use a direct request', cors_headers);
|
|
|
|
|
res.end();
|
|
|
|
|
return;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
var isRequestedOverHttps = req.connection.encrypted || /^\s*https/.test(req.headers['x-forwarded-proto']);
|
|
|
|
|
var proxyBaseUrl = (isRequestedOverHttps ? 'https://' : 'http://') + req.headers.host;
|
|
|
|
|
|
|
|
|
|
corsAnywhere.removeHeaders.forEach(function(header) {
|
|
|
|
|
delete req.headers[header];
|
|
|
|
|
});
|
|
|
|
|
|
|
|
|
|
Object.keys(corsAnywhere.setHeaders).forEach(function(header) {
|
|
|
|
|
req.headers[header] = corsAnywhere.setHeaders[header];
|
|
|
|
|
});
|
|
|
|
|
|
|
|
|
|
req.corsAnywhereRequestState.location = location;
|
|
|
|
|
req.corsAnywhereRequestState.proxyBaseUrl = proxyBaseUrl;
|
|
|
|
|
|
|
|
|
|
proxyRequest(req, res, proxy);
|
|
|
|
|
};
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
// Create server with default and given values
|
|
|
|
|
// Creator still needs to call .listen()
|
|
|
|
|
exports.createServer = function createServer(options) {
|
|
|
|
|
options = options || {};
|
|
|
|
|
|
|
|
|
|
// Default options:
|
|
|
|
|
var httpProxyOptions = {
|
|
|
|
|
xfwd: true, // Append X-Forwarded-* headers
|
|
|
|
|
secure: process.env.NODE_TLS_REJECT_UNAUTHORIZED !== '0',
|
|
|
|
|
};
|
|
|
|
|
// Allow user to override defaults and add own options
|
|
|
|
|
if (options.httpProxyOptions) {
|
|
|
|
|
Object.keys(options.httpProxyOptions).forEach(function(option) {
|
|
|
|
|
httpProxyOptions[option] = options.httpProxyOptions[option];
|
|
|
|
|
});
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
var proxy = httpProxy.createServer(httpProxyOptions);
|
|
|
|
|
var requestHandler = getHandler(options, proxy);
|
|
|
|
|
var server;
|
|
|
|
|
if (options.httpsOptions) {
|
|
|
|
|
server = require('https').createServer(options.httpsOptions, requestHandler);
|
|
|
|
|
} else {
|
|
|
|
|
server = require('http').createServer(requestHandler);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
// When the server fails, just show a 404 instead of Internal server error
|
|
|
|
|
proxy.on('error', function(err, req, res) {
|
|
|
|
|
if (res.headersSent) {
|
|
|
|
|
// This could happen when a protocol error occurs when an error occurs
|
|
|
|
|
// after the headers have been received (and forwarded). Do not write
|
|
|
|
|
// the headers because it would generate an error.
|
|
|
|
|
// Prior to Node 13.x, the stream would have ended.
|
|
|
|
|
// As of Node 13.x, we must explicitly close it.
|
|
|
|
|
if (res.writableEnded === false) {
|
|
|
|
|
res.end();
|
|
|
|
|
}
|
|
|
|
|
return;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
// When the error occurs after setting headers but before writing the response,
|
|
|
|
|
// then any previously set headers must be removed.
|
|
|
|
|
var headerNames = res.getHeaderNames ? res.getHeaderNames() : Object.keys(res._headers || {});
|
|
|
|
|
headerNames.forEach(function(name) {
|
|
|
|
|
res.removeHeader(name);
|
|
|
|
|
});
|
|
|
|
|
|
|
|
|
|
res.writeHead(404, {'Access-Control-Allow-Origin': '*'});
|
|
|
|
|
res.end('Not found because of proxy error: ' + err);
|
|
|
|
|
});
|
|
|
|
|
|
|
|
|
|
return server;
|
|
|
|
|
};
|