flow like the river

VISUALIZACION/node_modules/hpagent/index.js

@@ -0,0 +1,126 @@
+'use strict'
+
+const https = require('https')
+const http = require('http')
+const { URL } = require('url')
+
+class HttpProxyAgent extends http.Agent {
+  constructor (options) {
+    const { proxy, proxyRequestOptions, ...opts } = options
+    super(opts)
+    this.proxy = typeof proxy === 'string'
+      ? new URL(proxy)
+      : proxy
+    this.proxyRequestOptions = proxyRequestOptions || {}
+  }
+
+  createConnection (options, callback) {
+    const requestOptions = {
+      ...this.proxyRequestOptions,
+      method: 'CONNECT',
+      host: this.proxy.hostname,
+      port: this.proxy.port,
+      path: `${options.host}:${options.port}`,
+      setHost: false,
+      headers: { ...this.proxyRequestOptions.headers, connection: this.keepAlive ? 'keep-alive' : 'close', host: `${options.host}:${options.port}` },
+      agent: false,
+      timeout: options.timeout || 0
+    }
+
+    if (this.proxy.username || this.proxy.password) {
+      const base64 = Buffer.from(`${decodeURIComponent(this.proxy.username || '')}:${decodeURIComponent(this.proxy.password || '')}`).toString('base64')
+      requestOptions.headers['proxy-authorization'] = `Basic ${base64}`
+    }
+
+    if (this.proxy.protocol === 'https:') {
+      requestOptions.servername = this.proxy.hostname
+    }
+
+    const request = (this.proxy.protocol === 'http:' ? http : https).request(requestOptions)
+    request.once('connect', (response, socket, head) => {
+      request.removeAllListeners()
+      socket.removeAllListeners()
+      if (response.statusCode === 200) {
+        callback(null, socket)
+      } else {
+        socket.destroy()
+        callback(new Error(`Bad response: ${response.statusCode}`), null)
+      }
+    })
+
+    request.once('timeout', () => {
+      request.destroy(new Error('Proxy timeout'))
+    })
+
+    request.once('error', err => {
+      request.removeAllListeners()
+      callback(err, null)
+    })
+
+    request.end()
+  }
+}
+
+class HttpsProxyAgent extends https.Agent {
+  constructor (options) {
+    const { proxy, proxyRequestOptions, ...opts } = options
+    super(opts)
+    this.proxy = typeof proxy === 'string'
+      ? new URL(proxy)
+      : proxy
+    this.proxyRequestOptions = proxyRequestOptions || {}
+  }
+
+  createConnection (options, callback) {
+    const requestOptions = {
+      ...this.proxyRequestOptions,
+      method: 'CONNECT',
+      host: this.proxy.hostname,
+      port: this.proxy.port,
+      path: `${options.host}:${options.port}`,
+      setHost: false,
+      headers: { ...this.proxyRequestOptions.headers, connection: this.keepAlive ? 'keep-alive' : 'close', host: `${options.host}:${options.port}` },
+      agent: false,
+      timeout: options.timeout || 0
+    }
+
+    if (this.proxy.username || this.proxy.password) {
+      const base64 = Buffer.from(`${decodeURIComponent(this.proxy.username || '')}:${decodeURIComponent(this.proxy.password || '')}`).toString('base64')
+      requestOptions.headers['proxy-authorization'] = `Basic ${base64}`
+    }
+
+    // Necessary for the TLS check with the proxy to succeed.
+    if (this.proxy.protocol === 'https:') {
+      requestOptions.servername = this.proxy.hostname
+    }
+
+    const request = (this.proxy.protocol === 'http:' ? http : https).request(requestOptions)
+    request.once('connect', (response, socket, head) => {
+      request.removeAllListeners()
+      socket.removeAllListeners()
+      if (response.statusCode === 200) {
+        const secureSocket = super.createConnection({ ...options, socket })
+        callback(null, secureSocket)
+      } else {
+        socket.destroy()
+        callback(new Error(`Bad response: ${response.statusCode}`), null)
+      }
+    })
+
+    request.once('timeout', () => {
+      request.destroy(new Error('Proxy timeout'))
+    })
+
+    request.once('error', err => {
+      request.removeAllListeners()
+      callback(err, null)
+    })
+
+    request.end()
+  }
+}
+
+module.exports = {
+  HttpProxyAgent,
+  HttpsProxyAgent
+}