add hw2

node_modules/pac-proxy-agent/dist/index.js

@@ -0,0 +1,238 @@
+"use strict";
+var __createBinding = (this && this.__createBinding) || (Object.create ? (function(o, m, k, k2) {
+    if (k2 === undefined) k2 = k;
+    var desc = Object.getOwnPropertyDescriptor(m, k);
+    if (!desc || ("get" in desc ? !m.__esModule : desc.writable || desc.configurable)) {
+      desc = { enumerable: true, get: function() { return m[k]; } };
+    }
+    Object.defineProperty(o, k2, desc);
+}) : (function(o, m, k, k2) {
+    if (k2 === undefined) k2 = k;
+    o[k2] = m[k];
+}));
+var __setModuleDefault = (this && this.__setModuleDefault) || (Object.create ? (function(o, v) {
+    Object.defineProperty(o, "default", { enumerable: true, value: v });
+}) : function(o, v) {
+    o["default"] = v;
+});
+var __importStar = (this && this.__importStar) || function (mod) {
+    if (mod && mod.__esModule) return mod;
+    var result = {};
+    if (mod != null) for (var k in mod) if (k !== "default" && Object.prototype.hasOwnProperty.call(mod, k)) __createBinding(result, mod, k);
+    __setModuleDefault(result, mod);
+    return result;
+};
+var __importDefault = (this && this.__importDefault) || function (mod) {
+    return (mod && mod.__esModule) ? mod : { "default": mod };
+};
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.PacProxyAgent = void 0;
+const net = __importStar(require("net"));
+const tls = __importStar(require("tls"));
+const crypto = __importStar(require("crypto"));
+const events_1 = require("events");
+const debug_1 = __importDefault(require("debug"));
+const url_1 = require("url");
+const agent_base_1 = require("agent-base");
+const get_uri_1 = require("get-uri");
+const pac_resolver_1 = require("pac-resolver");
+const quickjs_emscripten_1 = require("@tootallnate/quickjs-emscripten");
+const debug = (0, debug_1.default)('pac-proxy-agent');
+const setServernameFromNonIpHost = (options) => {
+    if (options.servername === undefined &&
+        options.host &&
+        !net.isIP(options.host)) {
+        return {
+            ...options,
+            servername: options.host,
+        };
+    }
+    return options;
+};
+/**
+ * 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
+ */
+class PacProxyAgent extends agent_base_1.Agent {
+    constructor(uri, opts) {
+        super(opts);
+        this.clearResolverPromise = () => {
+            this.resolverPromise = undefined;
+        };
+        // Strip the "pac+" prefix
+        const uriStr = typeof uri === 'string' ? uri : uri.href;
+        this.uri = new url_1.URL(uriStr.replace(/^pac\+/i, ''));
+        debug('Creating PacProxyAgent with URI %o', this.uri.href);
+        // @ts-expect-error Not sure why TS is complaining here…
+        this.opts = { ...opts };
+        this.cache = undefined;
+        this.resolver = undefined;
+        this.resolverHash = '';
+        this.resolverPromise = undefined;
+        // For `PacResolver`
+        if (!this.opts.filename) {
+            this.opts.filename = this.uri.href;
+        }
+    }
+    /**
+     * Loads the PAC proxy file from the source if necessary, and returns
+     * a generated `FindProxyForURL()` resolver function to use.
+     */
+    getResolver() {
+        if (!this.resolverPromise) {
+            this.resolverPromise = this.loadResolver();
+            this.resolverPromise.then(this.clearResolverPromise, this.clearResolverPromise);
+        }
+        return this.resolverPromise;
+    }
+    async loadResolver() {
+        try {
+            // (Re)load the contents of the PAC file URI
+            const [qjs, code] = await Promise.all([
+                (0, quickjs_emscripten_1.getQuickJS)(),
+                this.loadPacFile(),
+            ]);
+            // Create a sha1 hash of the JS code
+            const hash = crypto.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 = (0, pac_resolver_1.createPacResolver)(qjs, 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
+     */
+    async loadPacFile() {
+        debug('Loading PAC file: %o', this.uri);
+        const rs = await (0, get_uri_1.getUri)(this.uri, { ...this.opts, cache: this.cache });
+        debug('Got `Readable` instance for URI');
+        this.cache = rs;
+        const buf = await (0, agent_base_1.toBuffer)(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.
+     */
+    async connect(req, opts) {
+        const { secureEndpoint } = opts;
+        const isWebSocket = req.getHeader('upgrade') === 'websocket';
+        // First, get a generated `FindProxyForURL()` function,
+        // either cached or retrieved from the source
+        const resolver = await this.getResolver();
+        // Calculate the `url` parameter
+        const protocol = secureEndpoint ? 'https:' : 'http:';
+        const host = opts.host && net.isIPv6(opts.host) ? `[${opts.host}]` : opts.host;
+        const defaultPort = secureEndpoint ? 443 : 80;
+        const url = Object.assign(new url_1.URL(req.path, `${protocol}//${host}`), defaultPort ? undefined : { port: opts.port });
+        debug('url: %s', url);
+        let result = await resolver(url);
+        // Default to "DIRECT" if a falsey value was returned (or nothing)
+        if (!result) {
+            result = 'DIRECT';
+        }
+        const proxies = String(result)
+            .trim()
+            .split(/\s*;\s*/g)
+            .filter(Boolean);
+        if (this.opts.fallbackToDirect && !proxies.includes('DIRECT')) {
+            proxies.push('DIRECT');
+        }
+        for (const proxy of proxies) {
+            let agent = null;
+            let socket = null;
+            const [type, target] = proxy.split(/\s+/);
+            debug('Attempting to use proxy: %o', proxy);
+            if (type === 'DIRECT') {
+                // Direct connection to the destination endpoint
+                if (secureEndpoint) {
+                    socket = tls.connect(setServernameFromNonIpHost(opts));
+                }
+                else {
+                    socket = net.connect(opts);
+                }
+            }
+            else if (type === 'SOCKS' || type === 'SOCKS5') {
+                // Use a SOCKSv5h proxy
+                const { SocksProxyAgent } = await Promise.resolve().then(() => __importStar(require('socks-proxy-agent')));
+                agent = new SocksProxyAgent(`socks://${target}`, this.opts);
+            }
+            else if (type === 'SOCKS4') {
+                // Use a SOCKSv4a proxy
+                const { SocksProxyAgent } = await Promise.resolve().then(() => __importStar(require('socks-proxy-agent')));
+                agent = new SocksProxyAgent(`socks4a://${target}`, this.opts);
+            }
+            else if (type === 'PROXY' ||
+                type === 'HTTP' ||
+                type === 'HTTPS') {
+                // Use an HTTP or HTTPS proxy
+                // http://dev.chromium.org/developers/design-documents/secure-web-proxy
+                const proxyURL = `${type === 'HTTPS' ? 'https' : 'http'}://${target}`;
+                if (secureEndpoint || isWebSocket) {
+                    const { HttpsProxyAgent } = await Promise.resolve().then(() => __importStar(require('https-proxy-agent')));
+                    agent = new HttpsProxyAgent(proxyURL, this.opts);
+                }
+                else {
+                    const { HttpProxyAgent } = await Promise.resolve().then(() => __importStar(require('http-proxy-agent')));
+                    agent = new HttpProxyAgent(proxyURL, this.opts);
+                }
+            }
+            try {
+                if (socket) {
+                    // "DIRECT" connection, wait for connection confirmation
+                    await (0, events_1.once)(socket, 'connect');
+                    req.emit('proxy', { proxy, socket });
+                    return socket;
+                }
+                if (agent) {
+                    const s = await agent.connect(req, opts);
+                    if (!(s instanceof net.Socket)) {
+                        throw new Error('Expected a `net.Socket` to be returned from agent');
+                    }
+                    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)}`);
+    }
+}
+PacProxyAgent.protocols = [
+    'pac+data',
+    'pac+file',
+    'pac+ftp',
+    'pac+http',
+    'pac+https',
+];
+exports.PacProxyAgent = PacProxyAgent;
+//# sourceMappingURL=index.js.map