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<?php
/**
* HTTP Socket connection class.
*
* PHP 5
*
* CakePHP(tm) : Rapid Development Framework (http://cakephp.org)
* Copyright 2005-2012, Cake Software Foundation, Inc. (http://cakefoundation.org)
*
* Licensed under The MIT License
* Redistributions of files must retain the above copyright notice.
*
* @copyright Copyright 2005-2012, Cake Software Foundation, Inc. (http://cakefoundation.org)
* @link http://cakephp.org CakePHP(tm) Project
* @package Cake.Network.Http
* @since CakePHP(tm) v 1.2.0
* @license MIT License (http://www.opensource.org/licenses/mit-license.php)
*/
App::uses('CakeSocket', 'Network');
App::uses('Router', 'Routing');

/**
* Cake network socket connection class.
*
* Core base class for HTTP network communication. HttpSocket can be used as an
* Object Oriented replacement for cURL in many places.
*
* @package Cake.Network.Http
*/
class HttpSocket extends CakeSocket {

/**
* 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
*/
public $quirksMode = false;

/**
* Contain information about the last request (read only)
*
* @var array
*/
public $request = array(
'method' => 'GET',
'uri' => array(
'scheme' => 'http',
'host' => null,
'port' => 80,
'user' => null,
'pass' => null,
'path' => null,
'query' => null,
'fragment' => null
),
'version' => '1.1',
'body' => '',
'line' => null,
'header' => array(
'Connection' => 'close',
'User-Agent' => 'CakePHP'
),
'raw' => null,
'redirect' => false,
'cookies' => array()
);

/**
* Contain information about the last response (read only)
*
* @var array
*/
public $response = null;

/**
* Response classname
*
* @var string
*/
public $responseClass = 'HttpResponse';

/**
* Configuration settings for the HttpSocket and the requests
*
* @var array
*/
public $config = array(
'persistent' => false,
'host' => 'localhost',
'protocol' => 'tcp',
'port' => 80,
'timeout' => 30,
'request' => array(
'uri' => array(
'scheme' => array('http', 'https'),
'host' => 'localhost',
'port' => array(80, 443)
),
'redirect' => false,
'cookies' => array()
)
);

/**
* Authentication settings
*
* @var array
*/
protected $_auth = array();

/**
* Proxy settings
*
* @var array
*/
protected $_proxy = array();

/**
* Resource to receive the content of request
*
* @var mixed
*/
protected $_contentResource = null;

/**
* Build an HTTP Socket using the specified configuration.
*
* You can use a url string to set the url and use default configurations for
* all other options:
*
* `$http = new HttpSocket('http://cakephp.org/');`
*
* Or use an array to configure multiple options:
*
* {{{
* $http = new HttpSocket(array(
* 'host' => 'cakephp.org',
* 'timeout' => 20
* ));
* }}}
*
* See HttpSocket::$config for options that can be used.
*
* @param mixed $config Configuration information, either a string url or an array of options.
*/
public function __construct($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']);
}
$this->config = Hash::merge($this->config, $config);
}
parent::__construct($this->config);
}

/**
* Set authentication settings.
*
* Accepts two forms of parameters. If all you need is a username + password, as with
* Basic authentication you can do the following:
*
* {{{
* $http->configAuth('Basic', 'mark', 'secret');
* }}}
*
* If you are using an authentication strategy that requires more inputs, like Digest authentication
* you can call `configAuth()` with an array of user information.
*
* {{{
* $http->configAuth('Digest', array(
* 'user' => 'mark',
* 'pass' => 'secret',
* 'realm' => 'my-realm',
* 'nonce' => 1235
* ));
* }}}
*
* To remove any set authentication strategy, call `configAuth()` with no parameters:
*
* `$http->configAuth();`
*
* @param string $method Authentication method (ie. Basic, Digest). If empty, disable authentication
* @param mixed $user Username for authentication. Can be an array with settings to authentication class
* @param string $pass Password for authentication
* @return void
*/
public function configAuth($method, $user = null, $pass = null) {
if (empty($method)) {
$this->_auth = array();
return;
}
if (is_array($user)) {
$this->_auth = array($method => $user);
return;
}
$this->_auth = array($method => compact('user', 'pass'));
}

/**
* Set proxy settings
*
* @param mixed $host Proxy host. Can be an array with settings to authentication class
* @param integer $port Port. Default 3128.
* @param string $method Proxy method (ie, Basic, Digest). If empty, disable proxy authentication
* @param string $user Username if your proxy need authentication
* @param string $pass Password to proxy authentication
* @return void
*/
public function configProxy($host, $port = 3128, $method = null, $user = null, $pass = null) {
if (empty($host)) {
$this->_proxy = array();
return;
}
if (is_array($host)) {
$this->_proxy = $host + array('host' => null);
return;
}
$this->_proxy = compact('host', 'port', 'method', 'user', 'pass');
}

/**
* Set the resource to receive the request content. This resource must support fwrite.
*
* @param mixed $resource Resource or false to disable the resource use
* @return void
* @throws SocketException
*/
public function setContentResource($resource) {
if ($resource === false) {
$this->_contentResource = null;
return;
}
if (!is_resource($resource)) {
throw new SocketException(__d('cake_dev', 'Invalid resource.'));
}
$this->_contentResource = $resource;
}

/**
* Issue the specified request. HttpSocket::get() and HttpSocket::post() wrap this
* method and provide a more granular interface.
*
* @param mixed $request Either an URI string, or an array defining host/uri
* @return mixed false on error, HttpResponse on success
* @throws SocketException
*/
public function request($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);
$this->request = Hash::merge($this->request, array_diff_key($this->config['request'], array('cookies' => true)), $request);

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

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

if (isset($host)) {
$this->config['host'] = $host;
}
$this->_setProxy();
$this->request['proxy'] = $this->_proxy;

$cookies = null;

if (is_array($this->request['header'])) {
if (!empty($this->request['cookies'])) {
$cookies = $this->buildCookies($this->request['cookies']);
}
$scheme = '';
$port = 0;
if (isset($this->request['uri']['scheme'])) {
$scheme = $this->request['uri']['scheme'];
}
if (isset($this->request['uri']['port'])) {
$port = $this->request['uri']['port'];
}
if (
($scheme === 'http' && $port != 80) ||
($scheme === 'https' && $port != 443) ||
($port != 80 && $port != 443)
) {
$Host .= ':' . $port;
}
$this->request['header'] = array_merge(compact('Host'), $this->request['header']);
}

if (isset($this->request['uri']['user'], $this->request['uri']['pass'])) {
$this->configAuth('Basic', $this->request['uri']['user'], $this->request['uri']['pass']);
}
$this->_setAuth();
$this->request['auth'] = $this->_auth;

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

$connectionType = null;
if (isset($this->request['header']['Connection'])) {
$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 false;
}

$this->request['raw'] = '';
if ($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;
$inHeader = true;
while ($data = $this->read()) {
if ($this->_contentResource) {
if ($inHeader) {
$response .= $data;
$pos = strpos($response, "\r\n\r\n");
if ($pos !== false) {
$pos += 4;
$data = substr($response, $pos);
fwrite($this->_contentResource, $data);

$response = substr($response, 0, $pos);
$inHeader = false;
}
} else {
fwrite($this->_contentResource, $data);
fflush($this->_contentResource);
}
} else {
$response .= $data;
}
}

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

list($plugin, $responseClass) = pluginSplit($this->responseClass, true);
App::uses($responseClass, $plugin . 'Network/Http');
if (!class_exists($responseClass)) {
throw new SocketException(__d('cake_dev', 'Class %s not found.', $this->responseClass));
}
$this->response = new $responseClass($response);
if (!empty($this->response->cookies)) {
if (!isset($this->config['request']['cookies'][$Host])) {
$this->config['request']['cookies'][$Host] = array();
}
$this->config['request']['cookies'][$Host] = array_merge($this->config['request']['cookies'][$Host], $this->response->cookies);
}

if ($this->request['redirect'] && $this->response->isRedirect()) {
$request['uri'] = $this->response->getHeader('Location');
$request['redirect'] = is_int($this->request['redirect']) ? $this->request['redirect'] - 1 : $this->request['redirect'];
$this->response = $this->request($request);
}

return $this->response;
}

/**
* Issues a GET request to the specified URI, query, and request.
*
* Using a string uri and an array of query string parameters:
*
* `$response = $http->get('http://google.com/search', array('q' => 'cakephp', 'client' => 'safari'));`
*
* Would do a GET request to `http://google.com/search?q=cakephp&client=safari`
*
* You could express the same thing using a uri array and query string parameters:
*
* {{{
* $response = $http->get(
* array('host' => 'google.com', 'path' => '/search'),
* array('q' => 'cakephp', 'client' => 'safari')
* );
* }}}
*
* @param mixed $uri URI to request. Either a string uri, or a uri array, see HttpSocket::_parseUri()
* @param array $query Querystring parameters to append to URI
* @param array $request An indexed array with indexes such as 'method' or uri
* @return mixed Result of request, either false on failure or the response to the request.
*/
public function get($uri = null, $query = array(), $request = array()) {
if (!empty($query)) {
$uri = $this->_parseUri($uri, $this->config['request']['uri']);
if (isset($uri['query'])) {
$uri['query'] = array_merge($uri['query'], $query);
} else {
$uri['query'] = $query;
}
$uri = $this->_buildUri($uri);
}

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

/**
* Issues a POST request to the specified URI, query, and request.
*
* `post()` can be used to post simple data arrays to a url:
*
* {{{
* $response = $http->post('http://example.com', array(
* 'username' => 'batman',
* 'password' => 'bruce_w4yne'
* ));
* }}}
*
* @param mixed $uri URI to request. See HttpSocket::_parseUri()
* @param array $data Array of POST data keys and values.
* @param array $request An indexed array with indexes such as 'method' or uri
* @return mixed Result of request, either false on failure or the response to the request.
*/
public function post($uri = null, $data = array(), $request = array()) {
$request = Hash::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 HttpSocket::_parseUri()
* @param array $data Array of PUT data keys and values.
* @param array $request An indexed array with indexes such as 'method' or uri
* @return mixed Result of request
*/
public function put($uri = null, $data = array(), $request = array()) {
$request = Hash::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 $data Query to append to URI
* @param array $request An indexed array with indexes such as 'method' or uri
* @return mixed Result of request
*/
public function delete($uri = null, $data = array(), $request = array()) {
$request = Hash::merge(array('method' => 'DELETE', 'uri' => $uri, 'body' => $data), $request);
return $this->request($request);
}

/**
* Normalizes urls into a $uriTemplate. If no template is provided
* a default one will be used. Will generate the url using the
* current config information.
*
* ### Usage:
*
* After configuring part of the request parameters, you can use url() to generate
* urls.
*
* {{{
* $http = new HttpSocket('http://www.cakephp.org');
* $url = $http->url('/search?q=bar');
* }}}
*
* Would return `http://www.cakephp.org/search?q=bar`
*
* url() can also be used with custom templates:
*
* `$url = $http->url('http://www.cakephp/search?q=socket', '/%path?%query');`
*
* Would return `/search?q=socket`.
*
* @param mixed $url Either a string or array of url options to create a url with.
* @param string $uriTemplate A template string to use for url formatting.
* @return mixed Either false on failure or a string containing the composed url.
*/
public function url($url = null, $uriTemplate = null) {
if (is_null($url)) {
$url = '/';
}
if (is_string($url)) {
$scheme = $this->config['request']['uri']['scheme'];
if (is_array($scheme)) {
$scheme = $scheme[0];
}
$port = $this->config['request']['uri']['port'];
if (is_array($port)) {
$port = $port[0];
}
if ($url{0} == '/') {
$url = $this->config['request']['uri']['host'] . ':' . $port . $url;
}
if (!preg_match('/^.+:\/\/|\*|^\//', $url)) {
$url = $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);
}

/**
* Set authentication in request
*
* @return void
* @throws SocketException
*/
protected function _setAuth() {
if (empty($this->_auth)) {
return;
}
$method = key($this->_auth);
list($plugin, $authClass) = pluginSplit($method, true);
$authClass = Inflector::camelize($authClass) . 'Authentication';
App::uses($authClass, $plugin . 'Network/Http');

if (!class_exists($authClass)) {
throw new SocketException(__d('cake_dev', 'Unknown authentication method.'));
}
if (!method_exists($authClass, 'authentication')) {
throw new SocketException(sprintf(__d('cake_dev', 'The %s do not support authentication.'), $authClass));
}
call_user_func_array("$authClass::authentication", array($this, &$this->_auth[$method]));
}

/**
* Set the proxy configuration and authentication
*
* @return void
* @throws SocketException
*/
protected function _setProxy() {
if (empty($this->_proxy) || !isset($this->_proxy['host'], $this->_proxy['port'])) {
return;
}
$this->config['host'] = $this->_proxy['host'];
$this->config['port'] = $this->_proxy['port'];

if (empty($this->_proxy['method']) || !isset($this->_proxy['user'], $this->_proxy['pass'])) {
return;
}
list($plugin, $authClass) = pluginSplit($this->_proxy['method'], true);
$authClass = Inflector::camelize($authClass) . 'Authentication';
App::uses($authClass, $plugin . 'Network/Http');

if (!class_exists($authClass)) {
throw new SocketException(__d('cake_dev', 'Unknown authentication method for proxy.'));
}
if (!method_exists($authClass, 'proxyAuthentication')) {
throw new SocketException(sprintf(__d('cake_dev', 'The %s do not support proxy authentication.'), $authClass));
}
call_user_func_array("$authClass::proxyAuthentication", array($this, &$this->_proxy));
}

/**
* Parses and sets the specified URI into current request configuration.
*
* @param mixed $uri URI, See HttpSocket::_parseUri()
* @return boolean If uri has merged in config
*/
protected function _configUri($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'])
)
);
$this->config = Hash::merge($this->config, $config);
$this->config = Hash::merge($this->config, array_intersect_key($this->config['request']['uri'], $this->config));
return true;
}

/**
* Takes a $uri array and turns it into a fully qualified URL string
*
* @param mixed $uri Either A $uri array, or a request string. Will use $this->config if left empty.
* @param string $uriTemplate The Uri template/format to use.
* @return mixed A fully qualified URL formatted according to $uriTemplate, or false on failure
*/
protected function _buildUri($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']);
$uri['query'] = http_build_query($uri['query']);
$uri['query'] = rtrim($uri['query'], '=');
$stripIfEmpty = array(
'query' => '?%query',
'fragment' => '#%fragment',
'user' => '%user:%pass@',
'host' => '%host:%port/'
);

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 $base If true use default URI config, otherwise indexed array to set 'scheme', 'host', 'port', etc.
* @return array Parsed URI
*/
protected function _parseUri($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 means 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 $query is
* given, an empty array is returned.
*/
protected function _parseQuery($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, 2);
} 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 = $value;
continue;
}
if (!isset($parsedQuery[$key])) {
$parsedQuery[$key] = $value;
} else {
$parsedQuery[$key] = (array)$parsedQuery[$key];
$parsedQuery[$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 $versionToken The version token to use, defaults to HTTP/1.1
* @return string Request line
* @throws SocketException
*/
protected function _buildRequestLine($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)))) {
throw new SocketException(__d('cake_dev', 'HttpSocket::_buildRequestLine - Passed an invalid request line string. Activate quirks mode to do this.'));
}
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'), $request);
if (!empty($this->_proxy['host'])) {
$request['uri'] = $this->_buildUri($request['uri'], '%scheme://%host:%port/%path?%query');
} else {
$request['uri'] = $this->_buildUri($request['uri'], '/%path?%query');
}

if (!$this->quirksMode && $request['uri'] === '*' && !in_array($request['method'], $asteriskMethods)) {
throw new SocketException(__d('cake_dev', 'HttpSocket::_buildRequestLine - The "*" asterisk character is only allowed for the following methods: %s. Activate quirks mode to work outside of HTTP/1.1 specs.', implode(',', $asteriskMethods)));
}
return $request['method'] . ' ' . $request['uri'] . ' ' . $versionToken . "\r\n";
}

/**
* Builds the header.
*
* @param array $header Header to build
* @param string $mode
* @return string Header built from array
*/
protected function _buildHeader($header, $mode = 'standard') {
if (is_string($header)) {
return $header;
} elseif (!is_array($header)) {
return false;
}

$fieldsInHeader = array();
foreach ($header as $key => $value) {
$lowKey = strtolower($key);
if (array_key_exists($lowKey, $fieldsInHeader)) {
$header[$fieldsInHeader[$lowKey]] = $value;
unset($header[$key]);
} else {
$fieldsInHeader[$lowKey] = $key;
}
}

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

$returnHeader .= $field . ': ' . $contents . "\r\n";
}
}
return $returnHeader;
}

/**
* Builds cookie headers for a request.
*
* @param array $cookies Array of cookies to send with the request.
* @return string Cookie header string to be sent with the request.
* @todo Refactor token escape mechanism to be configurable
*/
public function buildCookies($cookies) {
$header = array();
foreach ($cookies as $name => $cookie) {
$header[] = $name . '=' . $this->_escapeToken($cookie['value'], array(';'));
}
return $this->_buildHeader(array('Cookie' => implode('; ', $header)), 'pragmatic');
}

/**
* Escapes a given $token according to RFC 2616 (HTTP 1.1 specs)
*
* @param string $token Token to escape
* @param array $chars
* @return string Escaped token
* @todo Test $chars parameter
*/
protected function _escapeToken($token, $chars = null) {
$regex = '/([' . implode('', $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
* @param array $chars
* @return array Escape chars
* @todo Test $chars parameter
*/
protected function _tokenEscapeChars($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 $escape;
}
foreach ($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 $full If set to false only HttpSocket::response and HttpSocket::request are reseted
* @return boolean True on success
*/
public function reset($full = true) {
static $initalState = array();
if (empty($initalState)) {
$initalState = get_class_vars(__CLASS__);
}
if (!$full) {
$this->request = $initalState['request'];
$this->response = $initalState['response'];
return true;
}
parent::reset($initalState);
return true;
}

}
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