<?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: Proxy.php 8064 2008-02-16 10:58:39Z thomas $ * @copyright  Copyright (c) 2005-2008 Zend Technologies USA Inc. (http://www.zend.com) * @license    http://framework.zend.com/license/new-bsd     New BSD License */require_once 'Zend/Uri/Http.php';require_once 'Zend/Http/Client.php';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) 2005-2008 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',        'proxy_host'    => '',        'proxy_port'    => 8080,        'proxy_user'    => '',        'proxy_pass'    => '',        'proxy_auth'    => Zend_Http_Client::AUTH_BASIC    );    /**     * Whether HTTPS CONNECT was already negotiated with the proxy or not     *     * @var boolean     */    protected $negotiated = false;        /**     * 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     * @param int     $timeout     */    public function connect($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);        // Go through a proxy - the connection is actually to the proxy server        $host = $this->config['proxy_host'];        $port = $this->config['proxy_port'];        // If we are connected to the wrong proxy, disconnect first        if (($this->connected_to[0] != $host || $this->connected_to[1] != $port)) {            if (is_resource($this->socket)) $this->close();        }        // Now, if we are not connected, connect        if (! is_resource($this->socket) || ! $this->config['keepalive']) {            $this->socket = @fsockopen($host, $port, $errno, $errstr, (int) $this->config['timeout']);            if (! $this->socket) {                $this->close();                require_once 'Zend/Http/Client/Adapter/Exception.php';		throw new Zend_Http_Client_Adapter_Exception(                    'Unable to Connect to proxy server ' . $host . ':' . $port . '. Error #' . $errno . ': ' . $errstr);            }            // Set the stream timeout            if (!stream_set_timeout($this->socket, (int) $this->config['timeout'])) {                require_once 'Zend/Http/Client/Adapter/Exception.php';                throw new Zend_Http_Client_Adapter_Exception('Unable to set the connection timeout');            }            // Update connected_to            $this->connected_to = array($host, $port);        }    }    /**     * Send request to the proxy server     *     * @param string        $method     * @param Zend_Uri_Http $uri     * @param string        $http_ver     * @param array         $headers     * @param string        $body     * @return string Request as string     */    public function write($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] != $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'] && ! isset($headers['proxy-authorization']))            $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        $request = "{$method} {$uri->__toString()} HTTP/{$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";        }        // 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");        }        return $request;    }    /**     * Preform handshaking with HTTPS proxy using CONNECT method     *     * @param string  $host     * @param integer $port     * @param string  $http_ver     * @param array   $headers     */    protected function connectHandshake($host, $port = 443, $http_ver = '1.1', array &$headers = array())    {    	$request = "CONNECT $host:$port HTTP/$http_ver\r\n" .     	           "Host: " . $this->config['proxy_host'] . "\r\n";    	// Add the user-agent header    	if (isset($this->config['useragent'])) {    		$request .= "User-agent: " . $this->config['useragent'] . "\r\n";    	}    	    	// If the proxy-authorization header is set, send it to proxy but remove    	// it from headers sent to target host    	if (isset($headers['proxy-authorization'])) {    	    $request .= "Proxy-authorization: " . $headers['proxy-authorization'] . "\r\n";    	    unset($headers['proxy-authorization']);    	}    	        $request .= "\r\n";        // Send the request        if (! @fwrite($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();    }}