269 lines
9.4 KiB
PHP
269 lines
9.4 KiB
PHP
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<?php
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/**
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* Zend Framework
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*
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* LICENSE
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*
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* This source file is subject to the new BSD license that is bundled
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* with this package in the file LICENSE.txt.
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* It is also available through the world-wide-web at this URL:
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* http://framework.zend.com/license/new-bsd
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* If you did not receive a copy of the license and are unable to
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* obtain it through the world-wide-web, please send an email
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* to license@zend.com so we can send you a copy immediately.
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*
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* @category Zend
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* @package Zend_Http
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* @subpackage Client_Adapter
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* @version $Id: Proxy.php 9868 2008-07-02 06:47:38Z shahar $
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* @copyright Copyright (c) 2005-2008 Zend Technologies USA Inc. (http://www.zend.com)
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* @license http://framework.zend.com/license/new-bsd New BSD License
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*/
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require_once 'Zend/Uri/Http.php';
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require_once 'Zend/Http/Client.php';
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require_once 'Zend/Http/Client/Adapter/Socket.php';
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/**
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* HTTP Proxy-supporting Zend_Http_Client adapter class, based on the default
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* socket based adapter.
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*
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* Should be used if proxy HTTP access is required. If no proxy is set, will
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* fall back to Zend_Http_Client_Adapter_Socket behavior. Just like the
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* default Socket adapter, this adapter does not require any special extensions
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* installed.
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*
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* @category Zend
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* @package Zend_Http
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* @subpackage Client_Adapter
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* @copyright Copyright (c) 2005-2008 Zend Technologies USA Inc. (http://www.zend.com)
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* @license http://framework.zend.com/license/new-bsd New BSD License
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*/
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class Zend_Http_Client_Adapter_Proxy extends Zend_Http_Client_Adapter_Socket
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{
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/**
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* Parameters array
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*
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* @var array
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*/
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protected $config = array(
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'ssltransport' => 'ssl',
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'proxy_host' => '',
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'proxy_port' => 8080,
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'proxy_user' => '',
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'proxy_pass' => '',
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'proxy_auth' => Zend_Http_Client::AUTH_BASIC,
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'persistent' => false
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);
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/**
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* Whether HTTPS CONNECT was already negotiated with the proxy or not
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*
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* @var boolean
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*/
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protected $negotiated = false;
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/**
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* Connect to the remote server
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*
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* Will try to connect to the proxy server. If no proxy was set, will
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* fall back to the target server (behave like regular Socket adapter)
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*
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* @param string $host
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* @param int $port
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* @param boolean $secure
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* @param int $timeout
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*/
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public function connect($host, $port = 80, $secure = false)
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{
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// If no proxy is set, fall back to Socket adapter
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if (! $this->config['proxy_host']) return parent::connect($host, $port, $secure);
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// Go through a proxy - the connection is actually to the proxy server
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$host = $this->config['proxy_host'];
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$port = $this->config['proxy_port'];
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// If we are connected to the wrong proxy, disconnect first
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if (($this->connected_to[0] != $host || $this->connected_to[1] != $port)) {
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if (is_resource($this->socket)) $this->close();
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}
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// Now, if we are not connected, connect
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if (! is_resource($this->socket) || ! $this->config['keepalive']) {
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$this->socket = @fsockopen($host, $port, $errno, $errstr, (int) $this->config['timeout']);
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if (! $this->socket) {
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$this->close();
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require_once 'Zend/Http/Client/Adapter/Exception.php';
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throw new Zend_Http_Client_Adapter_Exception(
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'Unable to Connect to proxy server ' . $host . ':' . $port . '. Error #' . $errno . ': ' . $errstr);
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}
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// Set the stream timeout
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if (!stream_set_timeout($this->socket, (int) $this->config['timeout'])) {
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require_once 'Zend/Http/Client/Adapter/Exception.php';
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throw new Zend_Http_Client_Adapter_Exception('Unable to set the connection timeout');
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}
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// Update connected_to
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$this->connected_to = array($host, $port);
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}
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}
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/**
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* Send request to the proxy server
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*
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* @param string $method
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* @param Zend_Uri_Http $uri
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* @param string $http_ver
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* @param array $headers
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* @param string $body
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* @return string Request as string
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*/
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public function write($method, $uri, $http_ver = '1.1', $headers = array(), $body = '')
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{
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// If no proxy is set, fall back to default Socket adapter
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if (! $this->config['proxy_host']) return parent::write($method, $uri, $http_ver, $headers, $body);
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// Make sure we're properly connected
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if (! $this->socket) {
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require_once 'Zend/Http/Client/Adapter/Exception.php';
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throw new Zend_Http_Client_Adapter_Exception("Trying to write but we are not connected");
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}
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$host = $this->config['proxy_host'];
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$port = $this->config['proxy_port'];
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if ($this->connected_to[0] != $host || $this->connected_to[1] != $port) {
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require_once 'Zend/Http/Client/Adapter/Exception.php';
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throw new Zend_Http_Client_Adapter_Exception("Trying to write but we are connected to the wrong proxy server");
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}
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// Add Proxy-Authorization header
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if ($this->config['proxy_user'] && ! isset($headers['proxy-authorization']))
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$headers['proxy-authorization'] = Zend_Http_Client::encodeAuthHeader(
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$this->config['proxy_user'], $this->config['proxy_pass'], $this->config['proxy_auth']
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);
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// if we are proxying HTTPS, preform CONNECT handshake with the proxy
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if ($uri->getScheme() == 'https' && (! $this->negotiated)) {
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$this->connectHandshake($uri->getHost(), $uri->getPort(), $http_ver, $headers);
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$this->negotiated = true;
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}
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// Save request method for later
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$this->method = $method;
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// Build request headers
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$request = "{$method} {$uri->__toString()} HTTP/{$http_ver}\r\n";
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// Add all headers to the request string
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foreach ($headers as $k => $v) {
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if (is_string($k)) $v = "$k: $v";
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$request .= "$v\r\n";
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}
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// Add the request body
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$request .= "\r\n" . $body;
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// Send the request
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if (! @fwrite($this->socket, $request)) {
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require_once 'Zend/Http/Client/Adapter/Exception.php';
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throw new Zend_Http_Client_Adapter_Exception("Error writing request to proxy server");
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}
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return $request;
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}
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/**
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* Preform handshaking with HTTPS proxy using CONNECT method
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*
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* @param string $host
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* @param integer $port
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* @param string $http_ver
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* @param array $headers
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*/
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protected function connectHandshake($host, $port = 443, $http_ver = '1.1', array &$headers = array())
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{
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$request = "CONNECT $host:$port HTTP/$http_ver\r\n" .
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"Host: " . $this->config['proxy_host'] . "\r\n";
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// Add the user-agent header
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if (isset($this->config['useragent'])) {
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$request .= "User-agent: " . $this->config['useragent'] . "\r\n";
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}
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// If the proxy-authorization header is set, send it to proxy but remove
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// it from headers sent to target host
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if (isset($headers['proxy-authorization'])) {
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$request .= "Proxy-authorization: " . $headers['proxy-authorization'] . "\r\n";
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unset($headers['proxy-authorization']);
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}
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$request .= "\r\n";
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// Send the request
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if (! @fwrite($this->socket, $request)) {
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require_once 'Zend/Http/Client/Adapter/Exception.php';
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throw new Zend_Http_Client_Adapter_Exception("Error writing request to proxy server");
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}
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// Read response headers only
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$response = '';
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$gotStatus = false;
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while ($line = @fgets($this->socket)) {
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$gotStatus = $gotStatus || (strpos($line, 'HTTP') !== false);
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if ($gotStatus) {
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$response .= $line;
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if (!chop($line)) break;
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}
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}
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// Check that the response from the proxy is 200
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if (Zend_Http_Response::extractCode($response) != 200) {
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require_once 'Zend/Http/Client/Adapter/Exception.php';
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throw new Zend_Http_Client_Adapter_Exception("Unable to connect to HTTPS proxy. Server response: " . $response);
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}
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// If all is good, switch socket to secure mode. We have to fall back
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// through the different modes
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$modes = array(
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STREAM_CRYPTO_METHOD_TLS_CLIENT,
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STREAM_CRYPTO_METHOD_SSLv3_CLIENT,
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STREAM_CRYPTO_METHOD_SSLv23_CLIENT,
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STREAM_CRYPTO_METHOD_SSLv2_CLIENT
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);
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$success = false;
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foreach($modes as $mode) {
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$success = stream_socket_enable_crypto($this->socket, true, $mode);
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if ($success) break;
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}
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if (! $success) {
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require_once 'Zend/Http/Client/Adapter/Exception.php';
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throw new Zend_Http_Client_Adapter_Exception("Unable to connect to" .
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" HTTPS server through proxy: could not negotiate secure connection.");
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}
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}
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/**
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* Close the connection to the server
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*
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*/
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public function close()
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{
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parent::close();
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$this->negotiated = false;
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}
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/**
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* Destructor: make sure the socket is disconnected
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*
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*/
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public function __destruct()
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{
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if ($this->socket) $this->close();
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}
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}
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