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http_socket.php

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<?php
/* SVN FILE: $Id: http__socket_8php-source.html 580 2008-07-01 14:45:49Z gwoo $ */
/**
 * HTTP Socket connection class.
 *
 * PHP versions 4 and 5
 *
 * CakePHP(tm) :  Rapid Development Framework <http://www.cakephp.org/>
 * Copyright 2005-2008, Cake Software Foundation, Inc.
 *                              1785 E. Sahara Avenue, Suite 490-204
 *                              Las Vegas, Nevada 89104
 *
 * Licensed under The MIT License
 * Redistributions of files must retain the above copyright notice.
 *
 * @filesource
 * @copyright       Copyright 2005-2008, Cake Software Foundation, Inc.
 * @link                http://www.cakefoundation.org/projects/info/cakephp CakePHP(tm) Project
 * @package         cake
 * @subpackage      cake.cake.libs
 * @since           CakePHP(tm) v 1.2.0
 * @version         $Revision: 580 $
 * @modifiedby      $LastChangedBy: gwoo $
 * @lastmodified    $Date: 2008-07-01 09:45:49 -0500 (Tue, 01 Jul 2008) $
 * @license         http://www.opensource.org/licenses/mit-license.php The MIT License
 */
App::import('Core', array('Socket', 'Set', 'Router'));

/**
 * Cake network socket connection class.
 *
 * Core base class for HTTP network communication.
 *
 * @package     cake
 * @subpackage  cake.cake.libs
 */
class HttpSocket extends CakeSocket {
/**
 * Object description
 *
 * @var string
 * @access public
 */
    var $description = 'HTTP-based DataSource Interface';

/**
 * When one activates the $quirksMode by setting it to true, all checks meant to enforce RFC 2616 (HTTP/1.1 specs)
 * will be disabled and additional measures to deal with non-standard responses will be enabled.
 *
 * @var boolean
 * @access public
 */
    var $quirksMode = false;

/**
 * The default values to use for a request
 *
 * @var array
 * @access public
 */
    var $request = array(
        'method' => 'GET',
        'uri' => array(
            'scheme' => 'http',
            'host' => null,
            'port' => 80,
            'user' => null,
            'pass' => null,
            'path' => null,
            'query' => null,
            'fragment' => null
        ),
        'auth' => array(
            'method' => 'basic',
            'user' => null,
            'pass' => null
        ),
        'version' => '1.1',
        'body' => '',
        'line' => null,
        'header' => array(
            'Connection' => 'close',
            'User-Agent' => 'CakePHP'
        ),
        'raw' => null,
        'cookies' => array()
    );
/**
* The default structure for storing the response
*
* @var array
* @access public
*/
    var $response = array(
        'raw' => array(
            'status-line' => null,
            'header' => null,
            'body' => null,
            'response' => null
        ),
        'status' => array(
            'http-version' => null,
            'code' => null,
            'reason-phrase' => null
        ),
        'header' => array(),
        'body' => '',
        'cookies' => array(),
    );

/**
 * Default configuration settings for the HttpSocket
 *
 * @var array
 * @access public
 */
    var $config = array(
        'persistent' => false,
        'host'       => 'localhost',
        'protocol'   => 'tcp',
        'port'       => 80,
        'timeout'    => 30,
        'request' => array(
            'uri' => array(
                'scheme' => 'http',
                'host' => 'localhost',
                'port' => 80
            ),
            'auth' => array(
                'method' => 'basic',
                'user' => null,
                'pass' => null
            ),
            'cookies' => array(),
        )
    );

/**
 * String that represents a line break.
 *
 * @var string
 * @access public
 */
    var $lineBreak = "\r\n";

/**
 * Build an HTTP Socket using the specified configuration.
 *
 * @param array $config Configuration
 */
    function __construct($config = array()) {
        if (is_string($config)) {
            $this->configUri($config);
        } elseif (is_array($config)) {
            if (isset($config['request']['uri']) && is_string($config['request']['uri'])) {
                $this->configUri($config['request']['uri']);
                unset($config['request']['uri']);
            }
            $this->config = Set::merge($this->config, $config);
        }
        parent::__construct($this->config);
    }

/**
 * Issue the specified request.
 *
 * @param mixed $request Either an URI string, or an array defining host/uri
 * @return mixed false on error, request body on success
 * @access public
 */
    function request($request = array()) {
        $this->reset(false);

        if (is_string($request)) {
            $request = array('uri' => $request);
        } elseif (!is_array($request)) {
            return false;
        }

        if (!isset($request['uri'])) {
            $request['uri'] = null;
        }
        $uri = $this->parseUri($request['uri']);

        if (!isset($uri['host'])) {
            $host = $this->config['host'];
        }
        if (isset($request['host'])) {
            $host = $request['host'];
            unset($request['host']);
        }

        $request['uri'] = $this->url($request['uri']);
        $request['uri'] = $this->parseUri($request['uri'], true);
        $this->request = Set::merge($this->request, $this->config['request'], $request);

        $this->configUri($this->request['uri']);

        if (isset($host)) {
            $this->config['host'] = $host;
        }
        $cookies = null;

        if (is_array($this->request['header'])) {
            $this->request['header'] = $this->parseHeader($this->request['header']);
            if (!empty($this->request['cookies'])) {
                $cookies = $this->buildCookies($this->request['cookies']);
            }
            $this->request['header'] = array_merge(array('Host' => $this->request['uri']['host']), $this->request['header']);
        }

        if (isset($this->request['auth']['user']) && isset($this->request['auth']['pass'])) {
            $this->request['header']['Authorization'] = $this->request['auth']['method'] ." ". base64_encode($this->request['auth']['user'] .":".$this->request['auth']['pass']);
        }
        if (isset($this->request['uri']['user']) && isset($this->request['uri']['pass'])) {
            $this->request['header']['Authorization'] = $this->request['auth']['method'] ." ". base64_encode($this->request['uri']['user'] .":".$this->request['uri']['pass']);
        }

        if (is_array($this->request['body'])) {
            $this->request['body'] = $this->httpSerialize($this->request['body']);
        }

        if (!empty($this->request['body']) && !isset($this->request['header']['Content-Type'])) {
            $this->request['header']['Content-Type'] = 'application/x-www-form-urlencoded';
        }

        if (!empty($this->request['body']) && !isset($this->request['header']['Content-Length'])) {
            $this->request['header']['Content-Length'] = strlen($this->request['body']);
        }

        $connectionType = @$this->request['header']['Connection'];
        $this->request['header'] = $this->buildHeader($this->request['header']).$cookies;

        if (empty($this->request['line'])) {
            $this->request['line'] = $this->buildRequestLine($this->request);
        }

        if ($this->quirksMode === false && $this->request['line'] === false) {
            return $this->response = false;
        }

        if ($this->request['line'] !== false) {
            $this->request['raw'] = $this->request['line'];
        }

        if ($this->request['header'] !== false) {
            $this->request['raw'] .= $this->request['header'];
        }

        $this->request['raw'] .= "\r\n";
        $this->request['raw'] .= $this->request['body'];
        $this->write($this->request['raw']);

        $response = null;
        while ($data = $this->read()) {
            $response .= $data;
        }

        if ($connectionType == 'close') {
            $this->disconnect();
        }

        $this->response = $this->parseResponse($response);
        if (!empty($this->response['cookies'])) {
            $this->config['request']['cookies'] = array_merge($this->config['request']['cookies'], $this->response['cookies']);
        }

        return $this->response['body'];
    }

/**
 * Issues a GET request to the specified URI, query, and request.
 *
 * @param mixed $uri URI to request (see {@link parseUri()})
 * @param array $query Query to append to URI
 * @param array $request An indexed array with indexes such as 'method' or uri
 * @return mixed Result of request
 * @access public
 */
    function get($uri = null, $query = array(), $request = array()) {
        if (!empty($query)) {
            $uri =$this->parseUri($uri);
            if (isset($uri['query'])) {
                $uri['query'] = array_merge($uri['query'], $query);
            } else {
                $uri['query'] = $query;
            }
            $uri = $this->buildUri($uri);
        }

        $request = Set::merge(array('method' => 'GET', 'uri' => $uri), $request);
        return $this->request($request);
    }

/**
 * Issues a POST request to the specified URI, query, and request.
 *
 * @param mixed $uri URI to request (see {@link parseUri()})
 * @param array $query Query to append to URI
 * @param array $request An indexed array with indexes such as 'method' or uri
 * @return mixed Result of request
 * @access public
 */
    function post($uri = null, $data = array(), $request = array()) {
        $request = Set::merge(array('method' => 'POST', 'uri' => $uri, 'body' => $data), $request);
        return $this->request($request);
    }

/**
 * Issues a PUT request to the specified URI, query, and request.
 *
 * @param mixed $uri URI to request (see {@link parseUri()})
 * @param array $query Query to append to URI
 * @param array $request An indexed array with indexes such as 'method' or uri
 * @return mixed Result of request
 * @access public
 */
    function put($uri = null, $data = array(), $request = array()) {
        $request = Set::merge(array('method' => 'PUT', 'uri' => $uri, 'body' => $data), $request);
        return $this->request($request);
    }

/**
 * Issues a DELETE request to the specified URI, query, and request.
 *
 * @param mixed $uri URI to request (see {@link parseUri()})
 * @param array $query Query to append to URI
 * @param array $request An indexed array with indexes such as 'method' or uri
 * @return mixed Result of request
 * @access public
 */
    function delete($uri = null, $data = array(), $request = array()) {
        $request = Set::merge(array('method' => 'DELETE', 'uri' => $uri, 'body' => $data), $request);
        return $this->request($request);
    }
/**
 * undocumented function
 *
 * @param unknown $url
 * @param unknown $uriTemplate
 * @return void
 * @access public
 */
    function url($url = null, $uriTemplate = null) {
        if (is_null($url)) {
            $url = '/';
        }
        if (is_string($url)) {
            if ($url{0} == '/') {
                $url = $this->config['request']['uri']['host'].':'.$this->config['request']['uri']['port'] . $url;
            }
            if (!preg_match('/^.+:\/\/|\*|^\//', $url)) {
                $url = $this->config['request']['uri']['scheme'].'://'.$url;
            }
        } elseif (!is_array($url) && !empty($url)) {
            return false;
        }

        $base = array_merge($this->config['request']['uri'], array('scheme' => array('http', 'https'), 'port' => array(80, 443)));
        $url = $this->parseUri($url, $base);

        if (empty($url)) {
            $url = $this->config['request']['uri'];
        }

        if (!empty($uriTemplate)) {
            return $this->buildUri($url, $uriTemplate);
        }
        return $this->buildUri($url);
    }

/**
 * Parses the given message and breaks it down in parts.
 *
 * @param string $message Message to parse
 * @return array Parsed message (with indexed elements such as raw, status, header, body)
 * @access protected
 */
    function parseResponse($message) {
        if (is_array($message)) {
            return $message;
        } elseif (!is_string($message)) {
            return false;
        }

        static $responseTemplate;

        if (empty($responseTemplate)) {
            $classVars = get_class_vars(__CLASS__);
            $responseTemplate = $classVars['response'];
        }

        $response = $responseTemplate;

        if (!preg_match("/^(.+\r\n)(.*)(?<=\r\n)\r\n/Us", $message, $match)) {
            return false;
        }

        list($null, $response['raw']['status-line'], $response['raw']['header']) = $match;
        $response['raw']['response'] = $message;
        $response['raw']['body'] = substr($message, strlen($match[0]));

        if (preg_match("/(.+) ([0-9]{3}) (.+)\r\n/DU", $response['raw']['status-line'], $match)) {
            $response['status']['http-version'] = $match[1];
            $response['status']['code'] = (int)$match[2];
            $response['status']['reason-phrase'] = $match[3];
        }

        $response['header'] = $this->parseHeader($response['raw']['header']);
        $decoded = $this->decodeBody($response['raw']['body'], @$response['header']['Transfer-Encoding']);
        $response['body'] = $decoded['body'];

        if (!empty($decoded['header'])) {
            $response['header'] = $this->parseHeader($this->buildHeader($response['header']).$this->buildHeader($decoded['header']));
        }

        if (!empty($response['header'])) {
            $response['cookies'] = $this->parseCookies($response['header']);
        }

        foreach ($response['raw'] as $field => $val) {
            if ($val === '') {
                $response['raw'][$field] = null;
            }
        }

        return $response;
    }
/**
 * Generic function to decode a $body with a given $encoding. Returns either an array with the keys
 * 'body' and 'header' or false on failure.
 *
 * @param string $body A string continaing the body to decode
 * @param mixed $encoding Can be false in case no encoding is being used, or a string representing the encoding
 * @return mixed Array or false
 * @access protected
 */
    function decodeBody($body, $encoding = 'chunked') {
        if (!is_string($body)) {
            return false;
        }
        if (empty($encoding)) {
            return array('body' => $body, 'header' => false);
        }
        $decodeMethod = 'decode'.Inflector::camelize(str_replace('-', '_', $encoding)).'Body';

        if (!is_callable(array(&$this, $decodeMethod))) {
            if (!$this->quirksMode) {
                trigger_error(sprintf(__('HttpSocket::decodeBody - Unknown encoding: %s. Activate quirks mode to surpress error.', true), h($encoding)), E_USER_WARNING);
            }
            return array('body' => $body, 'header' => false);
        }
        return $this->{$decodeMethod}($body);
    }
/**
 * Decodes a chunked message $body and returns either an array with the keys 'body' and 'header' or false as
 * a result.
 *
 * @param string $body A string continaing the chunked body to decode
 * @return mixed Array or false
 * @access protected
 */
    function decodeChunkedBody($body) {
        if (!is_string($body)) {
            return false;
        }

        $decodedBody = null;
        $chunkLength = null;

        while ($chunkLength !== 0) {
            if (!preg_match("/^([0-9a-f]+) *(?:;(.+)=(.+))?\r\n/iU", $body, $match)) {
                if (!$this->quirksMode) {
                    trigger_error(__('HttpSocket::decodeChunkedBody - Could not parse malformed chunk. Activate quirks mode to do this.', true), E_USER_WARNING);
                    return false;
                }
                break;
            }

            $chunkSize = 0;
            $hexLength = 0;
            $chunkExtensionName = '';
            $chunkExtensionValue = '';
            if (isset($match[0])) {
                $chunkSize = $match[0];
            }
            if (isset($match[1])) {
                $hexLength = $match[1];
            }
            if (isset($match[2])) {
                $chunkExtensionName = $match[2];
            }
            if (isset($match[3])) {
                $chunkExtensionValue = $match[3];
            }

            $body = substr($body, strlen($chunkSize));
            $chunkLength = hexdec($hexLength);
            $chunk = substr($body, 0, $chunkLength);
            if (!empty($chunkExtensionName)) {
                /**
                 * @todo See if there are popular chunk extensions we should implement
                 */
            }
            $decodedBody .= $chunk;
            if ($chunkLength !== 0) {
                $body = substr($body, $chunkLength+strlen("\r\n"));
            }
        }

        $entityHeader = false;
        if (!empty($body)) {
            $entityHeader = $this->parseHeader($body);
        }
        return array('body' => $decodedBody, 'header' => $entityHeader);
    }
/**
 * Parses and sets the specified URI into current request configuration.
 *
 * @param mixed $uri URI (see {@link parseUri()})
 * @return array Current configuration settings
 * @access protected
 */
    function configUri($uri = null) {
        if (empty($uri)) {
            return false;
        }

        if (is_array($uri)) {
            $uri = $this->parseUri($uri);
        } else {
            $uri = $this->parseUri($uri, true);
        }

        if (!isset($uri['host'])) {
            return false;
        }

        $config = array(
            'request' => array(
                'uri' => array_intersect_key($uri, $this->config['request']['uri']),
                'auth' => array_intersect_key($uri, $this->config['request']['auth'])
            )
        );
        $this->config = Set::merge($this->config, $config);
        $this->config = Set::merge($this->config, array_intersect_key($this->config['request']['uri'], $this->config));
        return $this->config;
    }
/**
 * Takes a $uri array and turns it into a fully qualified URL string
 *
 * @param array $uri A $uri array, or uses $this->config if left empty
 * @param string $uriTemplate The Uri template/format to use
 * @return string A fully qualified URL formated according to $uriTemplate
 * @access protected
 */
    function buildUri($uri = array(), $uriTemplate = '%scheme://%user:%pass@%host:%port/%path?%query#%fragment') {
        if (is_string($uri)) {
            $uri = array('host' => $uri);
        }
        $uri = $this->parseUri($uri, true);

        if (!is_array($uri) || empty($uri)) {
            return false;
        }

        $uri['path'] = preg_replace('/^\//', null, $uri['path']);
        $uri['query'] = $this->httpSerialize($uri['query']);
        $stripIfEmpty = array(
            'query' => '?%query',
            'fragment' => '#%fragment',
            'user' => '%user:%pass@'
        );

        foreach ($stripIfEmpty as $key => $strip) {
            if (empty($uri[$key])) {
                $uriTemplate = str_replace($strip, null, $uriTemplate);
            }
        }

        $defaultPorts = array('http' => 80, 'https' => 443);
        if (array_key_exists($uri['scheme'], $defaultPorts) && $defaultPorts[$uri['scheme']] == $uri['port']) {
            $uriTemplate = str_replace(':%port', null, $uriTemplate);
        }

        foreach ($uri as $property => $value) {
            $uriTemplate = str_replace('%'.$property, $value, $uriTemplate);
        }

        if ($uriTemplate === '/*') {
            $uriTemplate = '*';
        }
        return $uriTemplate;
    }
/**
 * Parses the given URI and breaks it down into pieces as an indexed array with elements
 * such as 'scheme', 'port', 'query'.
 *
 * @param string $uri URI to parse
 * @param mixed $base If true use default URI config, otherwise indexed array to set 'scheme', 'host', 'port', etc.
 * @return array Parsed URI
 * @access protected
 */
    function parseUri($uri = null, $base = array()) {
        $uriBase = array(
            'scheme' => array('http', 'https'),
            'host' => null,
            'port' => array(80, 443),
            'user' => null,
            'pass' => null,
            'path' => '/',
            'query' => null,
            'fragment' => null
        );

        if (is_string($uri)) {
            $uri = parse_url($uri);
        }
        if (!is_array($uri) || empty($uri)) {
            return false;
        }
        if ($base === true) {
            $base = $uriBase;
        }

        if (isset($base['port'], $base['scheme']) && is_array($base['port']) && is_array($base['scheme'])) {
            if (isset($uri['scheme']) && !isset($uri['port'])) {
                $base['port'] = $base['port'][array_search($uri['scheme'], $base['scheme'])];
            } elseif (isset($uri['port']) && !isset($uri['scheme'])) {
                $base['scheme'] = $base['scheme'][array_search($uri['port'], $base['port'])];
            }
        }

        if (is_array($base) && !empty($base)) {
            $uri = array_merge($base, $uri);
        }

        if (isset($uri['scheme']) && is_array($uri['scheme'])) {
            $uri['scheme'] = array_shift($uri['scheme']);
        }
        if (isset($uri['port']) && is_array($uri['port'])) {
            $uri['port'] = array_shift($uri['port']);
        }

        if (array_key_exists('query', $uri)) {
            $uri['query'] = $this->parseQuery($uri['query']);
        }

        if (!array_intersect_key($uriBase, $uri)) {
            return false;
        }
        return $uri;
    }
/**
 * This function can be thought of as a reverse to PHP5's http_build_query(). It takes a given query string and turns it into an array and
 * supports nesting by using the php bracket syntax. So this menas you can parse queries like:
 *
 * - ?key[subKey]=value
 * - ?key[]=value1&key[]=value2
 *
 * A leading '?' mark in $query is optional and does not effect the outcome of this function. For the complete capabilities of this implementation
 * take a look at HttpSocketTest::testParseQuery()
 *
 * @param mixed $query A query string to parse into an array or an array to return directly "as is"
 * @return array The $query parsed into a possibly multi-level array. If an empty $query is given, an empty array is returned.
 * @access protected
 */
    function parseQuery($query) {
        if (is_array($query)) {
            return $query;
        }
        $parsedQuery = array();

        if (is_string($query) && !empty($query)) {
            $query = preg_replace('/^\?/', '', $query);
            $items = explode('&', $query);

            foreach ($items as $item) {
                if (strpos($item, '=') !== false) {
                    list($key, $value) = explode('=', $item);
                } else {
                    $key = $item;
                    $value = null;
                }

                $key = urldecode($key);
                $value = urldecode($value);

                if (preg_match_all('/\[([^\[\]]*)\]/iUs', $key, $matches)) {
                    $subKeys = $matches[1];
                    $rootKey = substr($key, 0, strpos($key, '['));
                    if (!empty($rootKey)) {
                        array_unshift($subKeys, $rootKey);
                    }
                    $queryNode =& $parsedQuery;

                    foreach ($subKeys as $subKey) {
                        if (!is_array($queryNode)) {
                            $queryNode = array();
                        }

                        if ($subKey === '') {
                            $queryNode[] = array();
                            end($queryNode);
                            $subKey = key($queryNode);
                        }
                        $queryNode =& $queryNode[$subKey];
                    }
                    $queryNode = $value;
                } else {
                    $parsedQuery[$key] = $value;
                }
            }
        }
        return $parsedQuery;
    }
/**
 * Builds a request line according to HTTP/1.1 specs. Activate quirks mode to work outside specs.
 *
 * @param array $request Needs to contain a 'uri' key. Should also contain a 'method' key, otherwise defaults to GET.
 * @param string $versionToken The version token to use, defaults to HTTP/1.1
 * @return string Request line
 * @access protected
 */
    function buildRequestLine($request = array(), $versionToken = 'HTTP/1.1') {
        $asteriskMethods = array('OPTIONS');

        if (is_string($request)) {
            $isValid = preg_match("/(.+) (.+) (.+)\r\n/U", $request, $match);
            if (!$this->quirksMode && (!$isValid || ($match[2] == '*' && !in_array($match[3], $asteriskMethods)))) {
                trigger_error(__('HttpSocket::buildRequestLine - Passed an invalid request line string. Activate quirks mode to do this.', true), E_USER_WARNING);
                return false;
            }
            return $request;
        } elseif (!is_array($request)) {
            return false;
        } elseif (!array_key_exists('uri', $request)) {
            return false;
        }

        $request['uri'] = $this->parseUri($request['uri']);
        $request = array_merge(array('method' => 'GET'), $request);
        $request['uri'] = $this->buildUri($request['uri'], '/%path?%query');

        if (!$this->quirksMode && $request['uri'] === '*' && !in_array($request['method'], $asteriskMethods)) {
            trigger_error(sprintf(__('HttpSocket::buildRequestLine - The "*" asterisk character is only allowed for the following methods: %s. Activate quirks mode to work outside of HTTP/1.1 specs.', true), join(',', $asteriskMethods)), E_USER_WARNING);
            return false;
        }
        return $request['method'].' '.$request['uri'].' '.$versionToken.$this->lineBreak;
    }

/**
 * Serializes an array for transport.
 *
 * @param array $data Data to serialize
 * @return string Serialized variable
 * @access protected
 */
    function httpSerialize($data = array()) {
        if (is_string($data)) {
            return $data;
        }
        if (empty($data) || !is_array($data)) {
            return false;
        }
        return substr(Router::queryString($data), 1);
    }
/**
 * Builds the header.
 *
 * @param array $header Header to build
 * @return string Header built from array
 * @access protected
 */
    function buildHeader($header, $mode = 'standard') {
        if (is_string($header)) {
            return $header;
        } elseif (!is_array($header)) {
            return false;
        }

        $returnHeader = '';
        foreach ($header as $field => $contents) {
            if (is_array($contents) && $mode == 'standard') {
                $contents = join(',', $contents);
            }
            foreach ((array)$contents as $content) {
                $contents = preg_replace("/\r\n(?![\t ])/", "\r\n ", $content);
                $field = $this->escapeToken($field);

                $returnHeader .= $field.': '.$contents.$this->lineBreak;
            }
        }
        return $returnHeader;
    }

/**
 * Parses an array based header.
 *
 * @param array $header Header as an indexed array (field => value)
 * @return array Parsed header
 * @access protected
 */
    function parseHeader($header) {
        if (is_array($header)) {
            foreach ($header as $field => $value) {
                unset($header[$field]);
                $field = strtolower($field);
                preg_match_all('/(?:^|(?<=-))[a-z]/U', $field, $offsets, PREG_OFFSET_CAPTURE);

                foreach ($offsets[0] as $offset) {
                    $field = substr_replace($field, strtoupper($offset[0]), $offset[1], 1);
                }
                $header[$field] = $value;
            }
            return $header;
        } elseif (!is_string($header)) {
            return false;
        }

        preg_match_all("/(.+):(.+)(?:(?<![\t ])".$this->lineBreak."|\$)/Uis", $header, $matches, PREG_SET_ORDER);

        $header = array();
        foreach ($matches as $match) {
            list(, $field, $value) = $match;

            $value = trim($value);
            $value = preg_replace("/[\t ]\r\n/", "\r\n", $value);

            $field = $this->unescapeToken($field);

            $field = strtolower($field);
            preg_match_all('/(?:^|(?<=-))[a-z]/U', $field, $offsets, PREG_OFFSET_CAPTURE);
            foreach ($offsets[0] as $offset) {
                $field = substr_replace($field, strtoupper($offset[0]), $offset[1], 1);
            }

            if (!isset($header[$field])) {
                $header[$field] = $value;
            } else {
                $header[$field] = array_merge((array)$header[$field], (array)$value);
            }
        }
        return $header;
    }
/**
 * undocumented function
 *
 * @param unknown $header
 * @return void
 * @access public
 * @todo Make this 100% RFC 2965 confirm
 */
    function parseCookies($header) {
        if (!isset($header['Set-Cookie'])) {
            return false;
        }

        $cookies = array();
        foreach ((array)$header['Set-Cookie'] as $cookie) {
            $parts = preg_split('/(?<![^;]");[ \t]*/', $cookie);
            list($name, $value) = explode('=', array_shift($parts));
            $cookies[$name] = compact('value');
            foreach ($parts as $part) {
                if (strpos($part, '=') !== false) {
                    list($key, $value) = explode('=', $part);
                } else {
                    $key = $part;
                    $value = true;
                }

                $key = strtolower($key);
                if (!isset($cookies[$name][$key])) {
                    $cookies[$name][$key] = $value;
                }
            }
        }
        return $cookies;
    }
/**
 * undocumented function
 *
 * @param unknown $cookies
 * @return void
 * @access public
 * @todo Refactor token escape mechanism to be configurable
 */
    function buildCookies($cookies) {
        $header = array();
        foreach ($cookies as $name => $cookie) {
            $header[] = $name.'='.$this->escapeToken($cookie['value'], array(';'));
        }
        $header = $this->buildHeader(array('Cookie' => $header), 'pragmatic');
        return $header;
    }
/**
 * undocumented function
 *
 * @return void
 * @access public
 */
    function saveCookies() {

    }
/**
 * undocumented function
 *
 * @return void
 * @access public
 */
    function loadCookies() {

    }
/**
 * Unescapes a given $token according to RFC 2616 (HTTP 1.1 specs)
 *
 * @param string $token Token to unescape
 * @return string Unescaped token
 * @access protected
 * @todo Test $chars parameter
 */
    function unescapeToken($token, $chars = null) {
        $regex = '/"(['.join('', $this->__tokenEscapeChars(true, $chars)).'])"/';
        $token = preg_replace($regex, '\\1', $token);
        return $token;
    }
/**
 * Escapes a given $token according to RFC 2616 (HTTP 1.1 specs)
 *
 * @param string $token Token to escape
 * @return string Escaped token
 * @access protected
 * @todo Test $chars parameter
 */
    function escapeToken($token, $chars = null) {
        $regex = '/(['.join('', $this->__tokenEscapeChars(true, $chars)).'])/';
        $token = preg_replace($regex, '"\\1"', $token);
        return $token;
    }

/**
 * Gets escape chars according to RFC 2616 (HTTP 1.1 specs).
 *
 * @param boolean $hex true to get them as HEX values, false otherwise
 * @return array Escape chars
 * @access private
 * @todo Test $chars parameter
 */
    function __tokenEscapeChars($hex = true, $chars = null) {
        if (!empty($chars)) {
            $escape = $chars;
        } else {
            $escape = array('"', "(", ")", "<", ">", "@", ",", ";", ":", "\\", "/", "[", "]", "?", "=", "{", "}", " ");
            for ($i = 0; $i <= 31; $i++) {
                $escape[] = chr($i);
            }
            $escape[] = chr(127);
        }

        if ($hex == false) {
            return $escape;
        }
        $regexChars = '';
        foreach ($escape as $key => $char) {
            $escape[$key] = '\\x'.str_pad(dechex(ord($char)), 2, '0', STR_PAD_LEFT);
        }
        return $escape;
    }
/**
 * Resets the state of this HttpSocket instance to it's initial state (before Object::__construct got executed) or does
 * the same thing partially for the request and the response property only.
 *
 * @param boolean $full If set to false only HttpSocket::response and HttpSocket::request are reseted
 * @return boolean True on success
 * @access public
 */
    function reset($full = true) {
        static $initalState = array();
        if (empty($initalState)) {
            $initalState = get_class_vars(__CLASS__);
        }

        if ($full == false) {
            $this->request = $initalState['request'];
            $this->response = $initalState['response'];
            return true;
        }
        parent::reset($initalState);
        return true;
    }
}

?>

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