180 lines
7.8 KiB
JavaScript
180 lines
7.8 KiB
JavaScript
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"use strict";
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var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
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function adopt(value) { return value instanceof P ? value : new P(function (resolve) { resolve(value); }); }
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return new (P || (P = Promise))(function (resolve, reject) {
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function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
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function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
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function step(result) { result.done ? resolve(result.value) : adopt(result.value).then(fulfilled, rejected); }
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step((generator = generator.apply(thisArg, _arguments || [])).next());
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});
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};
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var __importDefault = (this && this.__importDefault) || function (mod) {
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return (mod && mod.__esModule) ? mod : { "default": mod };
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};
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Object.defineProperty(exports, "__esModule", { value: true });
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const net_1 = __importDefault(require("net"));
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const tls_1 = __importDefault(require("tls"));
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const url_1 = __importDefault(require("url"));
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const assert_1 = __importDefault(require("assert"));
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const debug_1 = __importDefault(require("debug"));
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const agent_base_1 = require("agent-base");
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const parse_proxy_response_1 = __importDefault(require("./parse-proxy-response"));
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const debug = debug_1.default('https-proxy-agent:agent');
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/**
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* The `HttpsProxyAgent` implements an HTTP Agent subclass that connects to
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* the specified "HTTP(s) proxy server" in order to proxy HTTPS requests.
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*
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* Outgoing HTTP requests are first tunneled through the proxy server using the
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* `CONNECT` HTTP request method to establish a connection to the proxy server,
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* and then the proxy server connects to the destination target and issues the
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* HTTP request from the proxy server.
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*
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* `https:` requests have their socket connection upgraded to TLS once
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* the connection to the proxy server has been established.
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*
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* @api public
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*/
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class HttpsProxyAgent extends agent_base_1.Agent {
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constructor(_opts) {
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let opts;
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if (typeof _opts === 'string') {
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opts = url_1.default.parse(_opts);
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}
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else {
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opts = _opts;
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}
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if (!opts) {
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throw new Error('an HTTP(S) proxy server `host` and `port` must be specified!');
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}
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debug('creating new HttpsProxyAgent instance: %o', opts);
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super(opts);
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const proxy = Object.assign({}, opts);
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// If `true`, then connect to the proxy server over TLS.
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// Defaults to `false`.
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this.secureProxy = opts.secureProxy || isHTTPS(proxy.protocol);
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// Prefer `hostname` over `host`, and set the `port` if needed.
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proxy.host = proxy.hostname || proxy.host;
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if (typeof proxy.port === 'string') {
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proxy.port = parseInt(proxy.port, 10);
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}
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if (!proxy.port && proxy.host) {
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proxy.port = this.secureProxy ? 443 : 80;
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}
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// ALPN is supported by Node.js >= v5.
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// attempt to negotiate http/1.1 for proxy servers that support http/2
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if (this.secureProxy && !('ALPNProtocols' in proxy)) {
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proxy.ALPNProtocols = ['http 1.1'];
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}
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if (proxy.host && proxy.path) {
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// If both a `host` and `path` are specified then it's most likely
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// the result of a `url.parse()` call... we need to remove the
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// `path` portion so that `net.connect()` doesn't attempt to open
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// that as a Unix socket file.
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delete proxy.path;
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delete proxy.pathname;
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}
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this.proxy = proxy;
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}
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/**
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* Called when the node-core HTTP client library is creating a
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* new HTTP request.
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*
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* @api protected
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*/
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callback(req, opts) {
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return __awaiter(this, void 0, void 0, function* () {
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const { proxy, secureProxy } = this;
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// Create a socket connection to the proxy server.
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let socket;
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if (secureProxy) {
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debug('Creating `tls.Socket`: %o', proxy);
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socket = tls_1.default.connect(proxy);
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}
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else {
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debug('Creating `net.Socket`: %o', proxy);
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socket = net_1.default.connect(proxy);
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}
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const headers = Object.assign({}, proxy.headers);
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const hostname = `${opts.host}:${opts.port}`;
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let payload = `CONNECT ${hostname} HTTP/1.1\r\n`;
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// Inject the `Proxy-Authorization` header if necessary.
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if (proxy.auth) {
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headers['Proxy-Authorization'] = `Basic ${Buffer.from(proxy.auth).toString('base64')}`;
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}
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// The `Host` header should only include the port
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// number when it is not the default port.
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let { host, port, secureEndpoint } = opts;
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if (!isDefaultPort(port, secureEndpoint)) {
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host += `:${port}`;
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}
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headers.Host = host;
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headers.Connection = 'close';
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for (const name of Object.keys(headers)) {
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payload += `${name}: ${headers[name]}\r\n`;
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}
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const proxyResponsePromise = parse_proxy_response_1.default(socket);
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socket.write(`${payload}\r\n`);
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const { statusCode, buffered } = yield proxyResponsePromise;
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if (statusCode === 200) {
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req.once('socket', resume);
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if (opts.secureEndpoint) {
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const servername = opts.servername || opts.host;
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if (!servername) {
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throw new Error('Could not determine "servername"');
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}
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// The proxy is connecting to a TLS server, so upgrade
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// this socket connection to a TLS connection.
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debug('Upgrading socket connection to TLS');
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return tls_1.default.connect(Object.assign(Object.assign({}, omit(opts, 'host', 'hostname', 'path', 'port')), { socket,
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servername }));
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}
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return socket;
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}
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// Some other status code that's not 200... need to re-play the HTTP
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// header "data" events onto the socket once the HTTP machinery is
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// attached so that the node core `http` can parse and handle the
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// error status code.
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// Close the original socket, and a new "fake" socket is returned
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// instead, so that the proxy doesn't get the HTTP request
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// written to it (which may contain `Authorization` headers or other
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// sensitive data).
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//
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// See: https://hackerone.com/reports/541502
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socket.destroy();
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const fakeSocket = new net_1.default.Socket();
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fakeSocket.readable = true;
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// Need to wait for the "socket" event to re-play the "data" events.
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req.once('socket', (s) => {
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debug('replaying proxy buffer for failed request');
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assert_1.default(s.listenerCount('data') > 0);
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// Replay the "buffered" Buffer onto the fake `socket`, since at
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// this point the HTTP module machinery has been hooked up for
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// the user.
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s.push(buffered);
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s.push(null);
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});
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return fakeSocket;
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});
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}
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}
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exports.default = HttpsProxyAgent;
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function resume(socket) {
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socket.resume();
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}
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function isDefaultPort(port, secure) {
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return Boolean((!secure && port === 80) || (secure && port === 443));
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}
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function isHTTPS(protocol) {
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return typeof protocol === 'string' ? /^https:?$/i.test(protocol) : false;
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}
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function omit(obj, ...keys) {
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const ret = {};
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let key;
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for (key in obj) {
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if (!keys.includes(key)) {
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ret[key] = obj[key];
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}
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}
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return ret;
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}
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//# sourceMappingURL=agent.js.map
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