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Mini Shell
Mini Shell
"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
Zerion Mini Shell 1.0