Support proxy authentication if proxy URL contains username/password

Author: clue

README.md

@@ -13,6 +13,7 @@ Async HTTP CONNECT proxy connector, use any TCP/IP protocol through an HTTP prox
     * [Secure TLS connections](#secure-tls-connections)
     * [Connection timeout](#connection-timeout)
     * [DNS resolution](#dns-resolution)
+    * [Authentication](#authentication)
     * [Advanced secure proxy connections](#advanced-secure-proxy-connections)
 * [Install](#install)
 * [Tests](#tests)
@@ -267,6 +268,35 @@ $connector = Connector($loop, array(
 > Also note how local DNS resolution is in fact entirely handled outside of this
   HTTP CONNECT client implementation.
 
+#### Authentication
+
+If your HTTP proxy server requires authentication, you may pass the username and
+password as part of the HTTP proxy URL like this:
+
+```php
+$proxy = new ProxyConnector('http://user:pass@127.0.0.1:8080', $connector);
+```
+
+Note that both the username and password must be percent-encoded if they contain
+special characters:
+
+```php
+$user = 'he:llo';
+$pass = 'p@ss';
+
+$proxy = new ProxyConnector(
+    rawurlencode($user) . ':' . rawurlencode($pass) . '@127.0.0.1:8080',
+    $connector
+);
+```
+
+> The authentication details will be used for basic authentication and will be
+  transferred in the `Proxy-Authorization` HTTP request header for each
+  connection attempt.
+  If the authentication details are missing or not accepted by the remote HTTP
+  proxy server, it is expected to reject each connection attempt with a
+  `407` (Proxy Authentication Required) response status code.
+
 #### Advanced secure proxy connections
 
 Note that communication between the client and the proxy is usually via an

src/ProxyConnector.php

@@ -42,6 +42,7 @@ class ProxyConnector implements ConnectorInterface
 {
     private $connector;
     private $proxyUri;
+    private $proxyAuth = '';
 
     /**
      * Instantiate a new ProxyConnector which uses the given $proxyUrl
@@ -73,6 +74,13 @@ public function __construct($proxyUrl, ConnectorInterface $connector)
 
         $this->connector = $connector;
         $this->proxyUri = $parts['scheme'] . '://' . $parts['host'] . ':' . $parts['port'];
+
+        // prepare Proxy-Authorization header if URI contains username/password
+        if (isset($parts['user']) || isset($parts['pass'])) {
+            $this->proxyAuth = 'Proxy-Authorization: Basic ' . base64_encode(
+                rawurldecode($parts['user'] . ':' . (isset($parts['pass']) ? $parts['pass'] : ''))
+            ) . "\r\n";
+        }
     }
 
     public function connect($uri)
@@ -116,7 +124,9 @@ public function connect($uri)
             $proxyUri .= '#' . $parts['fragment'];
         }
 
-        return $this->connector->connect($proxyUri)->then(function (ConnectionInterface $stream) use ($host, $port) {
+        $auth = $this->proxyAuth;
+
+        return $this->connector->connect($proxyUri)->then(function (ConnectionInterface $stream) use ($host, $port, $auth) {
             $deferred = new Deferred(function ($_, $reject) use ($stream) {
                 $reject(new RuntimeException('Operation canceled while waiting for response from proxy'));
                 $stream->close();
@@ -176,7 +186,7 @@ public function connect($uri)
                 $deferred->reject(new RuntimeException('Connection to proxy lost while waiting for response'));
             });
 
-            $stream->write("CONNECT " . $host . ":" . $port . " HTTP/1.1\r\nHost: " . $host . ":" . $port . "\r\n\r\n");
+            $stream->write("CONNECT " . $host . ":" . $port . " HTTP/1.1\r\nHost: " . $host . ":" . $port . "\r\n" . $auth . "\r\n");
 
             return $deferred->promise();
         });

tests/ProxyConnectorTest.php

@@ -88,7 +88,7 @@ public function testCancelPromiseWillCancelPendingConnection()
     public function testWillWriteToOpenConnection()
     {
         $stream = $this->getMockBuilder('React\Socket\Connection')->disableOriginalConstructor()->setMethods(array('close', 'write'))->getMock();
-        $stream->expects($this->once())->method('write');
+        $stream->expects($this->once())->method('write')->with("CONNECT google.com:80 HTTP/1.1\r\nHost: google.com:80\r\n\r\n");
 
         $promise = \React\Promise\resolve($stream);
         $this->connector->expects($this->once())->method('connect')->willReturn($promise);
@@ -98,6 +98,48 @@ public function testWillWriteToOpenConnection()
         $proxy->connect('google.com:80');
     }
 
+    public function testWillProxyAuthorizationHeaderIfProxyUriContainsAuthentication()
+    {
+        $stream = $this->getMockBuilder('React\Socket\Connection')->disableOriginalConstructor()->setMethods(array('close', 'write'))->getMock();
+        $stream->expects($this->once())->method('write')->with("CONNECT google.com:80 HTTP/1.1\r\nHost: google.com:80\r\nProxy-Authorization: Basic dXNlcjpwYXNz\r\n\r\n");
+
+        $promise = \React\Promise\resolve($stream);
+        $this->connector->expects($this->once())->method('connect')->willReturn($promise);
+
+        $proxy = new ProxyConnector('user:pass@proxy.example.com', $this->connector);
+
+        $proxy->connect('google.com:80');
+    }
+
+    public function testWillProxyAuthorizationHeaderIfProxyUriContainsOnlyUsernameWithoutPassword()
+    {
+        $stream = $this->getMockBuilder('React\Socket\Connection')->disableOriginalConstructor()->setMethods(array('close', 'write'))->getMock();
+        $stream->expects($this->once())->method('write')->with("CONNECT google.com:80 HTTP/1.1\r\nHost: google.com:80\r\nProxy-Authorization: Basic dXNlcjo=\r\n\r\n");
+
+        $promise = \React\Promise\resolve($stream);
+        $this->connector->expects($this->once())->method('connect')->willReturn($promise);
+
+        $proxy = new ProxyConnector('user@proxy.example.com', $this->connector);
+
+        $proxy->connect('google.com:80');
+    }
+
+    public function testWillProxyAuthorizationHeaderIfProxyUriContainsAuthenticationWithPercentEncoding()
+    {
+        $user = 'h@llÖ';
+        $pass = '%secret?';
+
+        $stream = $this->getMockBuilder('React\Socket\Connection')->disableOriginalConstructor()->setMethods(array('close', 'write'))->getMock();
+        $stream->expects($this->once())->method('write')->with("CONNECT google.com:80 HTTP/1.1\r\nHost: google.com:80\r\nProxy-Authorization: Basic " . base64_encode($user . ':' . $pass) . "\r\n\r\n");
+
+        $promise = \React\Promise\resolve($stream);
+        $this->connector->expects($this->once())->method('connect')->willReturn($promise);
+
+        $proxy = new ProxyConnector(rawurlencode($user) . ':' . rawurlencode($pass) . '@proxy.example.com', $this->connector);
+
+        $proxy->connect('google.com:80');
+    }
+
     public function testRejectsInvalidUri()
     {
         $this->connector->expects($this->never())->method('connect');