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Filename :
proxy.js
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'use strict' const { HttpProxyAgent } = require('http-proxy-agent') const { HttpsProxyAgent } = require('https-proxy-agent') const { SocksProxyAgent } = require('socks-proxy-agent') const { LRUCache } = require('lru-cache') const { InvalidProxyProtocolError } = require('./errors.js') const PROXY_CACHE = new LRUCache({ max: 20 }) const SOCKS_PROTOCOLS = new Set(SocksProxyAgent.protocols) const PROXY_ENV_KEYS = new Set(['https_proxy', 'http_proxy', 'proxy', 'no_proxy']) const PROXY_ENV = Object.entries(process.env).reduce((acc, [key, value]) => { key = key.toLowerCase() if (PROXY_ENV_KEYS.has(key)) { acc[key] = value } return acc }, {}) const getProxyAgent = (url) => { url = new URL(url) const protocol = url.protocol.slice(0, -1) if (SOCKS_PROTOCOLS.has(protocol)) { return SocksProxyAgent } if (protocol === 'https' || protocol === 'http') { return [HttpProxyAgent, HttpsProxyAgent] } throw new InvalidProxyProtocolError(url) } const isNoProxy = (url, noProxy) => { if (typeof noProxy === 'string') { noProxy = noProxy.split(',').map((p) => p.trim()).filter(Boolean) } if (!noProxy || !noProxy.length) { return false } const hostSegments = url.hostname.split('.').reverse() return noProxy.some((no) => { const noSegments = no.split('.').filter(Boolean).reverse() if (!noSegments.length) { return false } for (let i = 0; i < noSegments.length; i++) { if (hostSegments[i] !== noSegments[i]) { return false } } return true }) } const getProxy = (url, { proxy, noProxy }) => { url = new URL(url) if (!proxy) { proxy = url.protocol === 'https:' ? PROXY_ENV.https_proxy : PROXY_ENV.https_proxy || PROXY_ENV.http_proxy || PROXY_ENV.proxy } if (!noProxy) { noProxy = PROXY_ENV.no_proxy } if (!proxy || isNoProxy(url, noProxy)) { return null } return new URL(proxy) } module.exports = { getProxyAgent, getProxy, proxyCache: PROXY_CACHE, }