215 lines
9.4 KiB
JavaScript
215 lines
9.4 KiB
JavaScript
|
"use strict";
|
||
|
|
var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
|
||
|
|
function adopt(value) { return value instanceof P ? value : new P(function (resolve) { resolve(value); }); }
|
||
|
|
return new (P || (P = Promise))(function (resolve, reject) {
|
||
|
|
function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
|
||
|
|
function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
|
||
|
|
function step(result) { result.done ? resolve(result.value) : adopt(result.value).then(fulfilled, rejected); }
|
||
|
|
step((generator = generator.apply(thisArg, _arguments || [])).next());
|
||
|
|
});
|
||
|
|
};
|
||
|
|
var __importDefault = (this && this.__importDefault) || function (mod) {
|
||
|
|
return (mod && mod.__esModule) ? mod : { "default": mod };
|
||
|
|
};
|
||
|
|
Object.defineProperty(exports, "__esModule", { value: true });
|
||
|
|
const net_1 = __importDefault(require("net"));
|
||
|
|
const tls_1 = __importDefault(require("tls"));
|
||
|
|
const once_1 = __importDefault(require("@tootallnate/once"));
|
||
|
|
const crypto_1 = __importDefault(require("crypto"));
|
||
|
|
const get_uri_1 = __importDefault(require("get-uri"));
|
||
|
|
const debug_1 = __importDefault(require("debug"));
|
||
|
|
const raw_body_1 = __importDefault(require("raw-body"));
|
||
|
|
const url_1 = require("url");
|
||
|
|
const http_proxy_agent_1 = require("http-proxy-agent");
|
||
|
|
const https_proxy_agent_1 = require("https-proxy-agent");
|
||
|
|
const socks_proxy_agent_1 = require("socks-proxy-agent");
|
||
|
|
const pac_resolver_1 = __importDefault(require("pac-resolver"));
|
||
|
|
const agent_base_1 = require("agent-base");
|
||
|
|
const debug = debug_1.default('pac-proxy-agent');
|
||
|
|
/**
|
||
|
|
* The `PacProxyAgent` class.
|
||
|
|
*
|
||
|
|
* A few different "protocol" modes are supported (supported protocols are
|
||
|
|
* backed by the `get-uri` module):
|
||
|
|
*
|
||
|
|
* - "pac+data", "data" - refers to an embedded "data:" URI
|
||
|
|
* - "pac+file", "file" - refers to a local file
|
||
|
|
* - "pac+ftp", "ftp" - refers to a file located on an FTP server
|
||
|
|
* - "pac+http", "http" - refers to an HTTP endpoint
|
||
|
|
* - "pac+https", "https" - refers to an HTTPS endpoint
|
||
|
|
*
|
||
|
|
* @api public
|
||
|
|
*/
|
||
|
|
class PacProxyAgent extends agent_base_1.Agent {
|
||
|
|
constructor(uri, opts = {}) {
|
||
|
|
super(opts);
|
||
|
|
this.clearResolverPromise = () => {
|
||
|
|
this.resolverPromise = undefined;
|
||
|
|
};
|
||
|
|
debug('Creating PacProxyAgent with URI %o and options %o', uri, opts);
|
||
|
|
// Strip the "pac+" prefix
|
||
|
|
this.uri = uri.replace(/^pac\+/i, '');
|
||
|
|
this.opts = Object.assign({}, opts);
|
||
|
|
this.cache = undefined;
|
||
|
|
this.resolver = undefined;
|
||
|
|
this.resolverHash = '';
|
||
|
|
this.resolverPromise = undefined;
|
||
|
|
// For `PacResolver`
|
||
|
|
if (!this.opts.filename) {
|
||
|
|
this.opts.filename = uri;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
/**
|
||
|
|
* Loads the PAC proxy file from the source if necessary, and returns
|
||
|
|
* a generated `FindProxyForURL()` resolver function to use.
|
||
|
|
*
|
||
|
|
* @api private
|
||
|
|
*/
|
||
|
|
getResolver() {
|
||
|
|
if (!this.resolverPromise) {
|
||
|
|
this.resolverPromise = this.loadResolver();
|
||
|
|
this.resolverPromise.then(this.clearResolverPromise, this.clearResolverPromise);
|
||
|
|
}
|
||
|
|
return this.resolverPromise;
|
||
|
|
}
|
||
|
|
loadResolver() {
|
||
|
|
return __awaiter(this, void 0, void 0, function* () {
|
||
|
|
try {
|
||
|
|
// (Re)load the contents of the PAC file URI
|
||
|
|
const code = yield this.loadPacFile();
|
||
|
|
// Create a sha1 hash of the JS code
|
||
|
|
const hash = crypto_1.default
|
||
|
|
.createHash('sha1')
|
||
|
|
.update(code)
|
||
|
|
.digest('hex');
|
||
|
|
if (this.resolver && this.resolverHash === hash) {
|
||
|
|
debug('Same sha1 hash for code - contents have not changed, reusing previous proxy resolver');
|
||
|
|
return this.resolver;
|
||
|
|
}
|
||
|
|
// Cache the resolver
|
||
|
|
debug('Creating new proxy resolver instance');
|
||
|
|
this.resolver = pac_resolver_1.default(code, this.opts);
|
||
|
|
// Store that sha1 hash for future comparison purposes
|
||
|
|
this.resolverHash = hash;
|
||
|
|
return this.resolver;
|
||
|
|
}
|
||
|
|
catch (err) {
|
||
|
|
if (this.resolver && err.code === 'ENOTMODIFIED') {
|
||
|
|
debug('Got ENOTMODIFIED response, reusing previous proxy resolver');
|
||
|
|
return this.resolver;
|
||
|
|
}
|
||
|
|
throw err;
|
||
|
|
}
|
||
|
|
});
|
||
|
|
}
|
||
|
|
/**
|
||
|
|
* Loads the contents of the PAC proxy file.
|
||
|
|
*
|
||
|
|
* @api private
|
||
|
|
*/
|
||
|
|
loadPacFile() {
|
||
|
|
return __awaiter(this, void 0, void 0, function* () {
|
||
|
|
debug('Loading PAC file: %o', this.uri);
|
||
|
|
const rs = yield get_uri_1.default(this.uri, { cache: this.cache });
|
||
|
|
debug('Got `Readable` instance for URI');
|
||
|
|
this.cache = rs;
|
||
|
|
const buf = yield raw_body_1.default(rs);
|
||
|
|
debug('Read %o byte PAC file from URI', buf.length);
|
||
|
|
return buf.toString('utf8');
|
||
|
|
});
|
||
|
|
}
|
||
|
|
/**
|
||
|
|
* Called when the node-core HTTP client library is creating a new HTTP request.
|
||
|
|
*
|
||
|
|
* @api protected
|
||
|
|
*/
|
||
|
|
callback(req, opts) {
|
||
|
|
return __awaiter(this, void 0, void 0, function* () {
|
||
|
|
const { secureEndpoint } = opts;
|
||
|
|
// First, get a generated `FindProxyForURL()` function,
|
||
|
|
// either cached or retrieved from the source
|
||
|
|
const resolver = yield this.getResolver();
|
||
|
|
// Calculate the `url` parameter
|
||
|
|
const defaultPort = secureEndpoint ? 443 : 80;
|
||
|
|
let path = req.path;
|
||
|
|
let search = null;
|
||
|
|
const firstQuestion = path.indexOf('?');
|
||
|
|
if (firstQuestion !== -1) {
|
||
|
|
search = path.substring(firstQuestion);
|
||
|
|
path = path.substring(0, firstQuestion);
|
||
|
|
}
|
||
|
|
const urlOpts = Object.assign(Object.assign({}, opts), { protocol: secureEndpoint ? 'https:' : 'http:', pathname: path, search,
|
||
|
|
// need to use `hostname` instead of `host` otherwise `port` is ignored
|
||
|
|
hostname: opts.host, host: null, href: null,
|
||
|
|
// set `port` to null when it is the protocol default port (80 / 443)
|
||
|
|
port: defaultPort === opts.port ? null : opts.port });
|
||
|
|
const url = url_1.format(urlOpts);
|
||
|
|
debug('url: %o', url);
|
||
|
|
let result = yield resolver(url);
|
||
|
|
// Default to "DIRECT" if a falsey value was returned (or nothing)
|
||
|
|
if (!result) {
|
||
|
|
result = 'DIRECT';
|
||
|
|
}
|
||
|
|
const proxies = String(result)
|
||
|
|
.trim()
|
||
|
|
.split(/\s*;\s*/g)
|
||
|
|
.filter(Boolean);
|
||
|
|
if (this.opts.fallbackToDirect && !proxies.includes('DIRECT')) {
|
||
|
|
proxies.push('DIRECT');
|
||
|
|
}
|
||
|
|
for (const proxy of proxies) {
|
||
|
|
let agent = null;
|
||
|
|
let socket = null;
|
||
|
|
const [type, target] = proxy.split(/\s+/);
|
||
|
|
debug('Attempting to use proxy: %o', proxy);
|
||
|
|
if (type === 'DIRECT') {
|
||
|
|
// Direct connection to the destination endpoint
|
||
|
|
socket = secureEndpoint ? tls_1.default.connect(opts) : net_1.default.connect(opts);
|
||
|
|
}
|
||
|
|
else if (type === 'SOCKS' || type === 'SOCKS5') {
|
||
|
|
// Use a SOCKSv5h proxy
|
||
|
|
agent = new socks_proxy_agent_1.SocksProxyAgent(`socks://${target}`);
|
||
|
|
}
|
||
|
|
else if (type === 'SOCKS4') {
|
||
|
|
// Use a SOCKSv4a proxy
|
||
|
|
agent = new socks_proxy_agent_1.SocksProxyAgent(`socks4a://${target}`);
|
||
|
|
}
|
||
|
|
else if (type === 'PROXY' ||
|
||
|
|
type === 'HTTP' ||
|
||
|
|
type === 'HTTPS') {
|
||
|
|
// Use an HTTP or HTTPS proxy
|
||
|
|
// http://dev.chromium.org/developers/design-documents/secure-web-proxy
|
||
|
|
const proxyURL = `${type === 'HTTPS' ? 'https' : 'http'}://${target}`;
|
||
|
|
const proxyOpts = Object.assign(Object.assign({}, this.opts), url_1.parse(proxyURL));
|
||
|
|
if (secureEndpoint) {
|
||
|
|
agent = new https_proxy_agent_1.HttpsProxyAgent(proxyOpts);
|
||
|
|
}
|
||
|
|
else {
|
||
|
|
agent = new http_proxy_agent_1.HttpProxyAgent(proxyOpts);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
try {
|
||
|
|
if (socket) {
|
||
|
|
// "DIRECT" connection, wait for connection confirmation
|
||
|
|
yield once_1.default(socket, 'connect');
|
||
|
|
req.emit('proxy', { proxy, socket });
|
||
|
|
return socket;
|
||
|
|
}
|
||
|
|
if (agent) {
|
||
|
|
const s = yield agent.callback(req, opts);
|
||
|
|
req.emit('proxy', { proxy, socket: s });
|
||
|
|
return s;
|
||
|
|
}
|
||
|
|
throw new Error(`Could not determine proxy type for: ${proxy}`);
|
||
|
|
}
|
||
|
|
catch (err) {
|
||
|
|
debug('Got error for proxy %o: %o', proxy, err);
|
||
|
|
req.emit('proxy', { proxy, error: err });
|
||
|
|
}
|
||
|
|
}
|
||
|
|
throw new Error(`Failed to establish a socket connection to proxies: ${JSON.stringify(proxies)}`);
|
||
|
|
});
|
||
|
|
}
|
||
|
|
}
|
||
|
|
exports.default = PacProxyAgent;
|
||
|
|
//# sourceMappingURL=agent.js.map
|