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 <?php
 
 /**
  * Zend Framework
  *
  * LICENSE
  *
  * This source file is subject to the new BSD license that is bundled
  * with this package in the file LICENSE.txt.
  * It is also available through the world-wide-web at this URL:
  * http://framework.zend.com/license/new-bsd
  * If you did not receive a copy of the license and are unable to
  * obtain it through the world-wide-web, please send an email
  * to license@zend.com so we can send you a copy immediately.
  *
  * @category   Zend
  * @package    Zend_Http
  * @subpackage Client_Adapter
  * @version    $Id$
  * @copyright  Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
  * @license    http://framework.zend.com/license/new-bsd     New BSD License
  */
 
 /**
  * @see Zend_Uri_Http
  */
 // require_once 'Zend/Uri/Http.php';
 /**
  * @see Zend_Http_Client
  */
 // require_once 'Zend/Http/Client.php';
 /**
  * @see Zend_Http_Client_Adapter_Socket
  */
 // require_once 'Zend/Http/Client/Adapter/Socket.php';
 
 /**
  * HTTP Proxy-supporting Zend_Http_Client adapter class, based on the default
  * socket based adapter.
  *
  * Should be used if proxy HTTP access is required. If no proxy is set, will
  * fall back to Zend_Http_Client_Adapter_Socket behavior. Just like the
  * default Socket adapter, this adapter does not require any special extensions
  * installed.
  *
  * @category   Zend
  * @package    Zend_Http
  * @subpackage Client_Adapter
  * @copyright  Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
  * @license    http://framework.zend.com/license/new-bsd     New BSD License
  */
 class Zend_Http_Client_Adapter_Proxy extends Zend_Http_Client_Adapter_Socket
 {
     /**
      * Parameters array
      *
      * @var array
      */
     protected $config = array(
         'ssltransport'  => 'ssl',
         'sslcert'       => null,
         'sslpassphrase' => null,
         'sslusecontext' => false,
         'proxy_host'    => '',
         'proxy_port'    => 8080,
         'proxy_user'    => '',
         'proxy_pass'    => '',
         'proxy_auth'    => Zend_Http_Client::AUTH_BASIC,
         'persistent'    => false,
     );
 
     /**
      * Whether HTTPS CONNECT was already negotiated with the proxy or not
      *
      * @var boolean
      */
     protected $negotiated = false;
     
     /**
      * Stores the last CONNECT handshake request
      * 
      * @var string
      */
     protected $connectHandshakeRequest;
 
     /**
      * Connect to the remote server
      *
      * Will try to connect to the proxy server. If no proxy was set, will
      * fall back to the target server (behave like regular Socket adapter)
      *
      * @param string  $host
      * @param int     $port
      * @param boolean $secure
      */
     public function connect($host, $port = 80, $secure = false)
     {
         // If no proxy is set, fall back to Socket adapter
         if (!$this->config['proxy_host']) {
             return parent::connect($host, $port, $secure);
         }
 
         /* Url might require stream context even if proxy connection doesn't */
         if ($secure) {
             $this->config['sslusecontext'] = true;
         }
 
         // Connect (a non-secure connection) to the proxy server
         return parent::connect(
             $this->config['proxy_host'],
             $this->config['proxy_port'],
             false
         );
     }
 
     /**
      * Send request to the proxy server
      *
      * @param string        $method
      * @param Zend_Uri_Http $uri
      * @param string        $http_ver
      * @param array         $headers
      * @param string        $body
      * @return string Request as string
      * @throws Zend_Http_Client_Adapter_Exception
      */
     public function write(
         $method, $uri, $http_ver = '1.1', $headers = array(), $body = ''
     )
     {
         // If no proxy is set, fall back to default Socket adapter
         if (!$this->config['proxy_host']) {
             return parent::write($method, $uri, $http_ver, $headers, $body);
         }
 
         // Make sure we're properly connected
         if (!$this->socket) {
             // require_once 'Zend/Http/Client/Adapter/Exception.php';
             throw new Zend_Http_Client_Adapter_Exception(
                 'Trying to write but we are not connected'
             );
         }
 
         $host = $this->config['proxy_host'];
         $port = $this->config['proxy_port'];
 
         if ($this->connected_to[0] != "tcp://$host"
             || $this->connected_to[1] != $port
         ) {
             // require_once 'Zend/Http/Client/Adapter/Exception.php';
             throw new Zend_Http_Client_Adapter_Exception(
                 'Trying to write but we are connected to the wrong proxy server'
             );
         }
 
         // Add Proxy-Authorization header
         if ($this->config['proxy_user']) {
             // Check to see if one already exists
             $hasProxyAuthHeader = false;
             foreach ($headers as $k => $v) {
                 if ((string) $k == 'proxy-authorization'
                     || preg_match("/^proxy-authorization:/i", $v)
                 ) {
                     $hasProxyAuthHeader = true;
                     break;
                 }
             }
             if (!$hasProxyAuthHeader) {
                 $headers[] = 'Proxy-authorization: '
                     . Zend_Http_Client::encodeAuthHeader(
                         $this->config['proxy_user'],
                         $this->config['proxy_pass'], $this->config['proxy_auth']
                     );
             }
         }
 
         // if we are proxying HTTPS, preform CONNECT handshake with the proxy
         if ($uri->getScheme() == 'https' && (!$this->negotiated)) {
             $this->connectHandshake(
                 $uri->getHost(), $uri->getPort(), $http_ver, $headers
             );
             $this->negotiated = true;
         }
 
         // Save request method for later
         $this->method = $method;
 
         // Build request headers
         if ($this->negotiated) {
             $path = $uri->getPath();
             if ($uri->getQuery()) {
                 $path .= '?' . $uri->getQuery();
             }
             $request = "$method $path HTTP/$http_ver\r\n";
         } else {
             $request = "$method $uri HTTP/$http_ver\r\n";
         }
 
         // Add all headers to the request string
         foreach ($headers as $k => $v) {
             if (is_string($k)) $v = "$k: $v";
             $request .= "$v\r\n";
         }
 
         if(is_resource($body)) {
             $request .= "\r\n";
         } else {
             // Add the request body
             $request .= "\r\n" . $body;
         }
 
         // Send the request
         if (!@fwrite($this->socket, $request)) {
             // require_once 'Zend/Http/Client/Adapter/Exception.php';
             throw new Zend_Http_Client_Adapter_Exception(
                 'Error writing request to proxy server'
             );
         }
 
         if(is_resource($body)) {
             if(stream_copy_to_stream($body, $this->socket) == 0) {
                 // require_once 'Zend/Http/Client/Adapter/Exception.php';
                 throw new Zend_Http_Client_Adapter_Exception(
                     'Error writing request to server'
                 );
             }
         }
 
         return $request;
     }
 
     /**
      * Preform handshaking with HTTPS proxy using CONNECT method
      *
      * @param string  $host
      * @param integer $port
      * @param string  $http_ver
      * @param array   $headers
      * @return void
      * @throws Zend_Http_Client_Adapter_Exception
      */
     protected function connectHandshake(
         $host, $port = 443, $http_ver = '1.1', array &$headers = array()
     )
     {
         $request = "CONNECT $host:$port HTTP/$http_ver\r\n" .
                    "Host: " . $host . "\r\n";
 
         // Process provided headers, including important ones to CONNECT request
         foreach ($headers as $k => $v) {
             switch (strtolower(substr($v,0,strpos($v,':')))) {
                 case 'proxy-authorization':
                     // break intentionally omitted
 
                 case 'user-agent':
                     $request .= $v . "\r\n";
                     break;
 
                 default:
                     break;
             }
         }
         $request .= "\r\n";
         
         // @see ZF-3189
         $this->connectHandshakeRequest = $request;
 
         // Send the request
         if (!@fwrite($this->socket, $request)) {
             // require_once 'Zend/Http/Client/Adapter/Exception.php';
             throw new Zend_Http_Client_Adapter_Exception(
                 'Error writing request to proxy server'
             );
         }
 
         // Read response headers only
         $response = '';
         $gotStatus = false;
         while ($line = @fgets($this->socket)) {
             $gotStatus = $gotStatus || (strpos($line, 'HTTP') !== false);
             if ($gotStatus) {
                 $response .= $line;
                 if (!chop($line)) {
                     break;
                 }
             }
         }
 
         // Check that the response from the proxy is 200
         if (Zend_Http_Response::extractCode($response) != 200) {
             // require_once 'Zend/Http/Client/Adapter/Exception.php';
             throw new Zend_Http_Client_Adapter_Exception(
                 'Unable to connect to HTTPS proxy. Server response: ' . $response
             );
         }
 
         // If all is good, switch socket to secure mode. We have to fall back
         // through the different modes
         $modes = array(
             STREAM_CRYPTO_METHOD_TLS_CLIENT,
             STREAM_CRYPTO_METHOD_SSLv3_CLIENT,
             STREAM_CRYPTO_METHOD_SSLv23_CLIENT,
             STREAM_CRYPTO_METHOD_SSLv2_CLIENT
         );
 
         $success = false;
         foreach($modes as $mode) {
             $success = stream_socket_enable_crypto($this->socket, true, $mode);
             if ($success) {
                 break;
             }
         }
 
         if (!$success) {
             // require_once 'Zend/Http/Client/Adapter/Exception.php';
             throw new Zend_Http_Client_Adapter_Exception(
                 'Unable to connect to HTTPS server through proxy: could not '
                 . 'negotiate secure connection.'
             );
         }
     }
 
     /**
      * Close the connection to the server
      *
      */
     public function close()
     {
         parent::close();
         $this->negotiated = false;
     }
 
     /**
      * Destructor: make sure the socket is disconnected
      *
      */
     public function __destruct()
     {
         if ($this->socket) {
             $this->close();
         }
     }
 }