add hw2

node_modules/proxy-agent/dist/index.js

@@ -0,0 +1,138 @@
+"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.ProxyAgent = exports.proxies = void 0;
+const http = __importStar(require("http"));
+const https = __importStar(require("https"));
+const url_1 = require("url");
+const lru_cache_1 = __importDefault(require("lru-cache"));
+const agent_base_1 = require("agent-base");
+const debug_1 = __importDefault(require("debug"));
+const proxy_from_env_1 = require("proxy-from-env");
+const debug = (0, debug_1.default)('proxy-agent');
+/**
+ * Shorthands for built-in supported types.
+ * Lazily loaded since some of these imports can be quite expensive
+ * (in particular, pac-proxy-agent).
+ */
+const wellKnownAgents = {
+    http: async () => (await Promise.resolve().then(() => __importStar(require('http-proxy-agent')))).HttpProxyAgent,
+    https: async () => (await Promise.resolve().then(() => __importStar(require('https-proxy-agent')))).HttpsProxyAgent,
+    socks: async () => (await Promise.resolve().then(() => __importStar(require('socks-proxy-agent')))).SocksProxyAgent,
+    pac: async () => (await Promise.resolve().then(() => __importStar(require('pac-proxy-agent')))).PacProxyAgent,
+};
+/**
+ * Supported proxy types.
+ */
+exports.proxies = {
+    http: [wellKnownAgents.http, wellKnownAgents.https],
+    https: [wellKnownAgents.http, wellKnownAgents.https],
+    socks: [wellKnownAgents.socks, wellKnownAgents.socks],
+    socks4: [wellKnownAgents.socks, wellKnownAgents.socks],
+    socks4a: [wellKnownAgents.socks, wellKnownAgents.socks],
+    socks5: [wellKnownAgents.socks, wellKnownAgents.socks],
+    socks5h: [wellKnownAgents.socks, wellKnownAgents.socks],
+    'pac+data': [wellKnownAgents.pac, wellKnownAgents.pac],
+    'pac+file': [wellKnownAgents.pac, wellKnownAgents.pac],
+    'pac+ftp': [wellKnownAgents.pac, wellKnownAgents.pac],
+    'pac+http': [wellKnownAgents.pac, wellKnownAgents.pac],
+    'pac+https': [wellKnownAgents.pac, wellKnownAgents.pac],
+};
+function isValidProtocol(v) {
+    return Object.keys(exports.proxies).includes(v);
+}
+/**
+ * Uses the appropriate `Agent` subclass based off of the "proxy"
+ * environment variables that are currently set.
+ *
+ * An LRU cache is used, to prevent unnecessary creation of proxy
+ * `http.Agent` instances.
+ */
+class ProxyAgent extends agent_base_1.Agent {
+    constructor(opts) {
+        super(opts);
+        /**
+         * Cache for `Agent` instances.
+         */
+        this.cache = new lru_cache_1.default({
+            max: 20,
+            dispose: (agent) => agent.destroy(),
+        });
+        debug('Creating new ProxyAgent instance: %o', opts);
+        this.connectOpts = opts;
+        this.httpAgent = opts?.httpAgent || new http.Agent(opts);
+        this.httpsAgent =
+            opts?.httpsAgent || new https.Agent(opts);
+        this.getProxyForUrl = opts?.getProxyForUrl || proxy_from_env_1.getProxyForUrl;
+    }
+    async connect(req, opts) {
+        const { secureEndpoint } = opts;
+        const isWebSocket = req.getHeader('upgrade') === 'websocket';
+        const protocol = secureEndpoint
+            ? isWebSocket
+                ? 'wss:'
+                : 'https:'
+            : isWebSocket
+                ? 'ws:'
+                : 'http:';
+        const host = req.getHeader('host');
+        const url = new url_1.URL(req.path, `${protocol}//${host}`).href;
+        const proxy = await this.getProxyForUrl(url, req);
+        if (!proxy) {
+            debug('Proxy not enabled for URL: %o', url);
+            return secureEndpoint ? this.httpsAgent : this.httpAgent;
+        }
+        debug('Request URL: %o', url);
+        debug('Proxy URL: %o', proxy);
+        // attempt to get a cached `http.Agent` instance first
+        const cacheKey = `${protocol}+${proxy}`;
+        let agent = this.cache.get(cacheKey);
+        if (!agent) {
+            const proxyUrl = new url_1.URL(proxy);
+            const proxyProto = proxyUrl.protocol.replace(':', '');
+            if (!isValidProtocol(proxyProto)) {
+                throw new Error(`Unsupported protocol for proxy URL: ${proxy}`);
+            }
+            const ctor = await exports.proxies[proxyProto][secureEndpoint || isWebSocket ? 1 : 0]();
+            agent = new ctor(proxy, this.connectOpts);
+            this.cache.set(cacheKey, agent);
+        }
+        else {
+            debug('Cache hit for proxy URL: %o', proxy);
+        }
+        return agent;
+    }
+    destroy() {
+        for (const agent of this.cache.values()) {
+            agent.destroy();
+        }
+        super.destroy();
+    }
+}
+exports.ProxyAgent = ProxyAgent;
+//# sourceMappingURL=index.js.map