1 files changed, 287 insertions, 0 deletions
diff --git a/vanilla/node_modules/undici/lib/dispatcher/proxy-agent.js b/vanilla/node_modules/undici/lib/dispatcher/proxy-agent.js
new file mode 100644
index 0000000..4403b8d
--- /dev/null
+++ b/vanilla/node_modules/undici/lib/dispatcher/proxy-agent.js
@@ -0,0 +1,287 @@
+'use strict'
+
+const { kProxy, kClose, kDestroy, kDispatch } = require('../core/symbols')
+const Agent = require('./agent')
+const Pool = require('./pool')
+const DispatcherBase = require('./dispatcher-base')
+const { InvalidArgumentError, RequestAbortedError, SecureProxyConnectionError } = require('../core/errors')
+const buildConnector = require('../core/connect')
+const Client = require('./client')
+const { channels } = require('../core/diagnostics')
+
+const kAgent = Symbol('proxy agent')
+const kClient = Symbol('proxy client')
+const kProxyHeaders = Symbol('proxy headers')
+const kRequestTls = Symbol('request tls settings')
+const kProxyTls = Symbol('proxy tls settings')
+const kConnectEndpoint = Symbol('connect endpoint function')
+const kTunnelProxy = Symbol('tunnel proxy')
+
+function defaultProtocolPort (protocol) {
+  return protocol === 'https:' ? 443 : 80
+}
+
+function defaultFactory (origin, opts) {
+  return new Pool(origin, opts)
+}
+
+const noop = () => {}
+
+function defaultAgentFactory (origin, opts) {
+  if (opts.connections === 1) {
+    return new Client(origin, opts)
+  }
+  return new Pool(origin, opts)
+}
+
+class Http1ProxyWrapper extends DispatcherBase {
+  #client
+
+  constructor (proxyUrl, { headers = {}, connect, factory }) {
+    if (!proxyUrl) {
+      throw new InvalidArgumentError('Proxy URL is mandatory')
+    }
+
+    super()
+
+    this[kProxyHeaders] = headers
+    if (factory) {
+      this.#client = factory(proxyUrl, { connect })
+    } else {
+      this.#client = new Client(proxyUrl, { connect })
+    }
+  }
+
+  [kDispatch] (opts, handler) {
+    const onHeaders = handler.onHeaders
+    handler.onHeaders = function (statusCode, data, resume) {
+      if (statusCode === 407) {
+        if (typeof handler.onError === 'function') {
+          handler.onError(new InvalidArgumentError('Proxy Authentication Required (407)'))
+        }
+        return
+      }
+      if (onHeaders) onHeaders.call(this, statusCode, data, resume)
+    }
+
+    // Rewrite request as an HTTP1 Proxy request, without tunneling.
+    const {
+      origin,
+      path = '/',
+      headers = {}
+    } = opts
+
+    opts.path = origin + path
+
+    if (!('host' in headers) && !('Host' in headers)) {
+      const { host } = new URL(origin)
+      headers.host = host
+    }
+    opts.headers = { ...this[kProxyHeaders], ...headers }
+
+    return this.#client[kDispatch](opts, handler)
+  }
+
+  [kClose] () {
+    return this.#client.close()
+  }
+
+  [kDestroy] (err) {
+    return this.#client.destroy(err)
+  }
+}
+
+class ProxyAgent extends DispatcherBase {
+  constructor (opts) {
+    if (!opts || (typeof opts === 'object' && !(opts instanceof URL) && !opts.uri)) {
+      throw new InvalidArgumentError('Proxy uri is mandatory')
+    }
+
+    const { clientFactory = defaultFactory } = opts
+    if (typeof clientFactory !== 'function') {
+      throw new InvalidArgumentError('Proxy opts.clientFactory must be a function.')
+    }
+
+    const { proxyTunnel = true } = opts
+
+    super()
+
+    const url = this.#getUrl(opts)
+    const { href, origin, port, protocol, username, password, hostname: proxyHostname } = url
+
+    this[kProxy] = { uri: href, protocol }
+    this[kRequestTls] = opts.requestTls
+    this[kProxyTls] = opts.proxyTls
+    this[kProxyHeaders] = opts.headers || {}
+    this[kTunnelProxy] = proxyTunnel
+
+    if (opts.auth && opts.token) {
+      throw new InvalidArgumentError('opts.auth cannot be used in combination with opts.token')
+    } else if (opts.auth) {
+      /* @deprecated in favour of opts.token */
+      this[kProxyHeaders]['proxy-authorization'] = `Basic ${opts.auth}`
+    } else if (opts.token) {
+      this[kProxyHeaders]['proxy-authorization'] = opts.token
+    } else if (username && password) {
+      this[kProxyHeaders]['proxy-authorization'] = `Basic ${Buffer.from(`${decodeURIComponent(username)}:${decodeURIComponent(password)}`).toString('base64')}`
+    }
+
+    const connect = buildConnector({ ...opts.proxyTls })
+    this[kConnectEndpoint] = buildConnector({ ...opts.requestTls })
+
+    const agentFactory = opts.factory || defaultAgentFactory
+    const factory = (origin, options) => {
+      const { protocol } = new URL(origin)
+      if (!this[kTunnelProxy] && protocol === 'http:' && this[kProxy].protocol === 'http:') {
+        return new Http1ProxyWrapper(this[kProxy].uri, {
+          headers: this[kProxyHeaders],
+          connect,
+          factory: agentFactory
+        })
+      }
+      return agentFactory(origin, options)
+    }
+    this[kClient] = clientFactory(url, { connect })
+    this[kAgent] = new Agent({
+      ...opts,
+      factory,
+      connect: async (opts, callback) => {
+        let requestedPath = opts.host
+        if (!opts.port) {
+          requestedPath += `:${defaultProtocolPort(opts.protocol)}`
+        }
+        try {
+          const connectParams = {
+            origin,
+            port,
+            path: requestedPath,
+            signal: opts.signal,
+            headers: {
+              ...this[kProxyHeaders],
+              host: opts.host,
+              ...(opts.connections == null || opts.connections > 0 ? { 'proxy-connection': 'keep-alive' } : {})
+            },
+            servername: this[kProxyTls]?.servername || proxyHostname
+          }
+          const { socket, statusCode } = await this[kClient].connect(connectParams)
+          if (statusCode !== 200) {
+            socket.on('error', noop).destroy()
+            callback(new RequestAbortedError(`Proxy response (${statusCode}) !== 200 when HTTP Tunneling`))
+            return
+          }
+
+          if (channels.proxyConnected.hasSubscribers) {
+            channels.proxyConnected.publish({
+              socket,
+              connectParams
+            })
+          }
+
+          if (opts.protocol !== 'https:') {
+            callback(null, socket)
+            return
+          }
+          let servername
+          if (this[kRequestTls]) {
+            servername = this[kRequestTls].servername
+          } else {
+            servername = opts.servername
+          }
+          this[kConnectEndpoint]({ ...opts, servername, httpSocket: socket }, callback)
+        } catch (err) {
+          if (err.code === 'ERR_TLS_CERT_ALTNAME_INVALID') {
+            // Throw a custom error to avoid loop in client.js#connect
+            callback(new SecureProxyConnectionError(err))
+          } else {
+            callback(err)
+          }
+        }
+      }
+    })
+  }
+
+  dispatch (opts, handler) {
+    const headers = buildHeaders(opts.headers)
+    throwIfProxyAuthIsSent(headers)
+
+    if (headers && !('host' in headers) && !('Host' in headers)) {
+      const { host } = new URL(opts.origin)
+      headers.host = host
+    }
+
+    return this[kAgent].dispatch(
+      {
+        ...opts,
+        headers
+      },
+      handler
+    )
+  }
+
+  /**
+   * @param {import('../../types/proxy-agent').ProxyAgent.Options | string | URL} opts
+   * @returns {URL}
+   */
+  #getUrl (opts) {
+    if (typeof opts === 'string') {
+      return new URL(opts)
+    } else if (opts instanceof URL) {
+      return opts
+    } else {
+      return new URL(opts.uri)
+    }
+  }
+
+  [kClose] () {
+    return Promise.all([
+      this[kAgent].close(),
+      this[kClient].close()
+    ])
+  }
+
+  [kDestroy] () {
+    return Promise.all([
+      this[kAgent].destroy(),
+      this[kClient].destroy()
+    ])
+  }
+}
+
+/**
+ * @param {string[] | Record<string, string>} headers
+ * @returns {Record<string, string>}
+ */
+function buildHeaders (headers) {
+  // When using undici.fetch, the headers list is stored
+  // as an array.
+  if (Array.isArray(headers)) {
+    /** @type {Record<string, string>} */
+    const headersPair = {}
+
+    for (let i = 0; i < headers.length; i += 2) {
+      headersPair[headers[i]] = headers[i + 1]
+    }
+
+    return headersPair
+  }
+
+  return headers
+}
+
+/**
+ * @param {Record<string, string>} headers
+ *
+ * Previous versions of ProxyAgent suggests the Proxy-Authorization in request headers
+ * Nevertheless, it was changed and to avoid a security vulnerability by end users
+ * this check was created.
+ * It should be removed in the next major version for performance reasons
+ */
+function throwIfProxyAuthIsSent (headers) {
+  const existProxyAuth = headers && Object.keys(headers)
+    .find((key) => key.toLowerCase() === 'proxy-authorization')
+  if (existProxyAuth) {
+    throw new InvalidArgumentError('Proxy-Authorization should be sent in ProxyAgent constructor')
+  }
+}
+
+module.exports = ProxyAgent