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<?php

/**

 * CakeRequest

 *

 * CakePHP(tm) : Rapid Development Framework (http://cakephp.org)

 * Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)

 *

 * Licensed under The MIT License

 * For full copyright and license information, please see the LICENSE.txt

 * Redistributions of files must retain the above copyright notice.

 *

 * @copyright     Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)

 * @link          http://cakephp.org CakePHP(tm) Project

 * @since         CakePHP(tm) v 2.0

 * @license       http://www.opensource.org/licenses/mit-license.php MIT License

 */

App::uses('Hash', 'Utility');

/**

 * A class that helps wrap Request information and particulars about a single request.

 * Provides methods commonly used to introspect on the request headers and request body.

 *

 * Has both an Array and Object interface. You can access framework parameters using indexes:

 *

 * `$request['controller']` or `$request->controller`.

 *

 * @package       Cake.Network

 */

class CakeRequest implements ArrayAccess {

/**

 * Array of parameters parsed from the URL.

 *

 * @var array

 */

	public $params = array(

		'plugin' => null,

		'controller' => null,

		'action' => null,

		'named' => array(),

		'pass' => array(),

	);

/**

 * Array of POST data. Will contain form data as well as uploaded files.

 * Inputs prefixed with 'data' will have the data prefix removed. If there is

 * overlap between an input prefixed with data and one without, the 'data' prefixed

 * value will take precedence.

 *

 * @var array

 */

	public $data = array();

/**

 * Array of querystring arguments

 *

 * @var array

 */

	public $query = array();

/**

 * The URL string used for the request.

 *

 * @var string

 */

	public $url;

/**

 * Base URL path.

 *

 * @var string

 */

	public $base = false;

/**

 * webroot path segment for the request.

 *

 * @var string

 */

	public $webroot = '/';

/**

 * The full address to the current request

 *

 * @var string

 */

	public $here = null;

/**

 * The built in detectors used with `is()` can be modified with `addDetector()`.

 *

 * There are several ways to specify a detector, see CakeRequest::addDetector() for the

 * various formats and ways to define detectors.

 *

 * @var array

 */

	protected $_detectors = array(

		'get' => array('env' => 'REQUEST_METHOD', 'value' => 'GET'),

		'post' => array('env' => 'REQUEST_METHOD', 'value' => 'POST'),

		'put' => array('env' => 'REQUEST_METHOD', 'value' => 'PUT'),

		'delete' => array('env' => 'REQUEST_METHOD', 'value' => 'DELETE'),

		'head' => array('env' => 'REQUEST_METHOD', 'value' => 'HEAD'),

		'options' => array('env' => 'REQUEST_METHOD', 'value' => 'OPTIONS'),

		'ssl' => array('env' => 'HTTPS', 'value' => 1),

		'ajax' => array('env' => 'HTTP_X_REQUESTED_WITH', 'value' => 'XMLHttpRequest'),

		'flash' => array('env' => 'HTTP_USER_AGENT', 'pattern' => '/^(Shockwave|Adobe) Flash/'),

		'mobile' => array('env' => 'HTTP_USER_AGENT', 'options' => array(

			'Android', 'AvantGo', 'BB10', 'BlackBerry', 'DoCoMo', 'Fennec', 'iPod', 'iPhone', 'iPad',

			'J2ME', 'MIDP', 'NetFront', 'Nokia', 'Opera Mini', 'Opera Mobi', 'PalmOS', 'PalmSource',

			'portalmmm', 'Plucker', 'ReqwirelessWeb', 'SonyEricsson', 'Symbian', 'UP\\.Browser',

			'webOS', 'Windows CE', 'Windows Phone OS', 'Xiino'

		)),

		'requested' => array('param' => 'requested', 'value' => 1),

		'json' => array('accept' => array('application/json'), 'param' => 'ext', 'value' => 'json'),

		'xml' => array('accept' => array('application/xml', 'text/xml'), 'param' => 'ext', 'value' => 'xml'),

	);

/**

 * Copy of php://input. Since this stream can only be read once in most SAPI's

 * keep a copy of it so users don't need to know about that detail.

 *

 * @var string

 */

	protected $_input = '';

/**

 * Constructor

 *

 * @param string $url Trimmed URL string to use. Should not contain the application base path.

 * @param bool $parseEnvironment Set to false to not auto parse the environment. ie. GET, POST and FILES.

 */

	public function __construct($url = null, $parseEnvironment = true) {

		$this->_base();

		if (empty($url)) {

			$url = $this->_url();

		}

		if ($url[0] === '/') {

			$url = substr($url, 1);

		}

		$this->url = $url;

		if ($parseEnvironment) {

			$this->_processPost();

			$this->_processGet();

			$this->_processFiles();

		}

		$this->here = $this->base . '/' . $this->url;

	}

/**

 * process the post data and set what is there into the object.

 * processed data is available at `$this->data`

 *

 * Will merge POST vars prefixed with `data`, and ones without

 * into a single array. Variables prefixed with `data` will overwrite those without.

 *

 * If you have mixed POST values be careful not to make any top level keys numeric

 * containing arrays. Hash::merge() is used to merge data, and it has possibly

 * unexpected behavior in this situation.

 *

 * @return void

 */

	protected function _processPost() {

		if ($_POST) {

			$this->data = $_POST;

		} elseif (($this->is('put') || $this->is('delete')) &&

			strpos(env('CONTENT_TYPE'), 'application/x-www-form-urlencoded') === 0

		) {

				$data = $this->_readInput();

				parse_str($data, $this->data);

		}

		if (ini_get('magic_quotes_gpc') === '1') {

			$this->data = stripslashes_deep($this->data);

		}

		if (env('HTTP_X_HTTP_METHOD_OVERRIDE')) {

			$this->data['_method'] = env('HTTP_X_HTTP_METHOD_OVERRIDE');

		}

		$isArray = is_array($this->data);

		if ($isArray && isset($this->data['_method'])) {

			if (!empty($_SERVER)) {

				$_SERVER['REQUEST_METHOD'] = $this->data['_method'];

			} else {

				$_ENV['REQUEST_METHOD'] = $this->data['_method'];

			}

			unset($this->data['_method']);

		}

		if ($isArray && isset($this->data['data'])) {

			$data = $this->data['data'];

			if (count($this->data) <= 1) {

				$this->data = $data;

			} else {

				unset($this->data['data']);

				$this->data = Hash::merge($this->data, $data);

			}

		}

	}

/**

 * Process the GET parameters and move things into the object.

 *

 * @return void

 */

	protected function _processGet() {

		if (ini_get('magic_quotes_gpc') === '1') {

			$query = stripslashes_deep($_GET);

		} else {

			$query = $_GET;

		}

		$unsetUrl = '/' . str_replace(array('.', ' '), '_', urldecode($this->url));

		unset($query[$unsetUrl]);

		unset($query[$this->base . $unsetUrl]);

		if (strpos($this->url, '?') !== false) {

			list(, $querystr) = explode('?', $this->url);

			parse_str($querystr, $queryArgs);

			$query += $queryArgs;

		}

		if (isset($this->params['url'])) {

			$query = array_merge($this->params['url'], $query);

		}

		$this->query = $query;

	}

/**

 * Get the request uri. Looks in PATH_INFO first, as this is the exact value we need prepared

 * by PHP. Following that, REQUEST_URI, PHP_SELF, HTTP_X_REWRITE_URL and argv are checked in that order.

 * Each of these server variables have the base path, and query strings stripped off

 *

 * @return string URI The CakePHP request path that is being accessed.

 */

	protected function _url() {

		if (!empty($_SERVER['PATH_INFO'])) {

			return $_SERVER['PATH_INFO'];

		} elseif (isset($_SERVER['REQUEST_URI']) && strpos($_SERVER['REQUEST_URI'], '://') === false) {

			$uri = $_SERVER['REQUEST_URI'];

		} elseif (isset($_SERVER['REQUEST_URI'])) {

			$qPosition = strpos($_SERVER['REQUEST_URI'], '?');

			if ($qPosition !== false && strpos($_SERVER['REQUEST_URI'], '://') > $qPosition) {

				$uri = $_SERVER['REQUEST_URI'];

			} else {

				$uri = substr($_SERVER['REQUEST_URI'], strlen(Configure::read('App.fullBaseUrl')));

			}

		} elseif (isset($_SERVER['PHP_SELF']) && isset($_SERVER['SCRIPT_NAME'])) {

			$uri = str_replace($_SERVER['SCRIPT_NAME'], '', $_SERVER['PHP_SELF']);

		} elseif (isset($_SERVER['HTTP_X_REWRITE_URL'])) {

			$uri = $_SERVER['HTTP_X_REWRITE_URL'];

		} elseif ($var = env('argv')) {

			$uri = $var[0];

		}

		$base = $this->base;

		if (strlen($base) > 0 && strpos($uri, $base) === 0) {

			$uri = substr($uri, strlen($base));

		}

		if (strpos($uri, '?') !== false) {

			list($uri) = explode('?', $uri, 2);

		}

		if (empty($uri) || $uri === '/' || $uri === '//' || $uri === '/index.php') {

			$uri = '/';

		}

		$endsWithIndex = '/webroot/index.php';

		$endsWithLength = strlen($endsWithIndex);

		if (strlen($uri) >= $endsWithLength &&

			substr($uri, -$endsWithLength) === $endsWithIndex

		) {

			$uri = '/';

		}

		return $uri;

	}

/**

 * Returns a base URL and sets the proper webroot

 *

 * If CakePHP is called with index.php in the URL even though

 * URL Rewriting is activated (and thus not needed) it swallows

 * the unnecessary part from $base to prevent issue #3318.

 *

 * @return string Base URL

 * @link https://cakephp.lighthouseapp.com/projects/42648-cakephp/tickets/3318

 */

	protected function _base() {

		$dir = $webroot = null;

		$config = Configure::read('App');

		extract($config);

		if (!isset($base)) {

			$base = $this->base;

		}

		if ($base !== false) {

			$this->webroot = $base . '/';

			return $this->base = $base;

		}

		if (!$baseUrl) {

			$base = dirname(env('PHP_SELF'));

			// Clean up additional / which cause following code to fail..

			$base = preg_replace('#/+#', '/', $base);

			$indexPos = strpos($base, '/webroot/index.php');

			if ($indexPos !== false) {

				$base = substr($base, 0, $indexPos) . '/webroot';

			}

			if ($webroot === 'webroot' && $webroot === basename($base)) {

				$base = dirname($base);

			}

			if ($dir === 'app' && $dir === basename($base)) {

				$base = dirname($base);

			}

			if ($base === DS || $base === '.') {

				$base = '';

			}

			$base = implode('/', array_map('rawurlencode', explode('/', $base)));

			$this->webroot = $base . '/';

			return $this->base = $base;

		}

		$file = '/' . basename($baseUrl);

		$base = dirname($baseUrl);

		if ($base === DS || $base === '.') {

			$base = '';

		}

		$this->webroot = $base . '/';

		$docRoot = env('DOCUMENT_ROOT');

		$docRootContainsWebroot = strpos($docRoot, $dir . DS . $webroot);

		if (!empty($base) || !$docRootContainsWebroot) {

			if (strpos($this->webroot, '/' . $dir . '/') === false) {

				$this->webroot .= $dir . '/';

			}

			if (strpos($this->webroot, '/' . $webroot . '/') === false) {

				$this->webroot .= $webroot . '/';

			}

		}

		return $this->base = $base . $file;

	}

/**

 * Process $_FILES and move things into the object.

 *

 * @return void

 */

	protected function _processFiles() {

		if (isset($_FILES) && is_array($_FILES)) {

			foreach ($_FILES as $name => $data) {

				if ($name !== 'data') {

					$this->params['form'][$name] = $data;

				}

			}

		}

		if (isset($_FILES['data'])) {

			foreach ($_FILES['data'] as $key => $data) {

				$this->_processFileData('', $data, $key);

			}

		}

	}

/**

 * Recursively walks the FILES array restructuring the data

 * into something sane and useable.

 *

 * @param string $path The dot separated path to insert $data into.

 * @param array $data The data to traverse/insert.

 * @param string $field The terminal field name, which is the top level key in $_FILES.

 * @return void

 */

	protected function _processFileData($path, $data, $field) {

		foreach ($data as $key => $fields) {

			$newPath = $key;

			if (strlen($path) > 0) {

				$newPath = $path . '.' . $key;

			}

			if (is_array($fields)) {

				$this->_processFileData($newPath, $fields, $field);

			} else {

				$newPath .= '.' . $field;

				$this->data = Hash::insert($this->data, $newPath, $fields);

			}

		}

	}

/**

 * Get the IP the client is using, or says they are using.

 *

 * @param bool $safe Use safe = false when you think the user might manipulate their HTTP_CLIENT_IP

 *   header. Setting $safe = false will also look at HTTP_X_FORWARDED_FOR

 * @return string The client IP.

 */

	public function clientIp($safe = true) {

		if (!$safe && env('HTTP_X_FORWARDED_FOR')) {

			$ipaddr = preg_replace('/(?:,.*)/', '', env('HTTP_X_FORWARDED_FOR'));

		} else {

			if (env('HTTP_CLIENT_IP')) {

				$ipaddr = env('HTTP_CLIENT_IP');

			} else {

				$ipaddr = env('REMOTE_ADDR');

			}

		}

		if (env('HTTP_CLIENTADDRESS')) {

			$tmpipaddr = env('HTTP_CLIENTADDRESS');

			if (!empty($tmpipaddr)) {

				$ipaddr = preg_replace('/(?:,.*)/', '', $tmpipaddr);

			}

		}

		return trim($ipaddr);

	}

/**

 * Returns the referer that referred this request.

 *

 * @param bool $local Attempt to return a local address. Local addresses do not contain hostnames.

 * @return string The referring address for this request.

 */

	public function referer($local = false) {

		$ref = env('HTTP_REFERER');

		$base = Configure::read('App.fullBaseUrl') . $this->webroot;

		if (!empty($ref) && !empty($base)) {

			if ($local && strpos($ref, $base) === 0) {

				$ref = substr($ref, strlen($base));

				if ($ref[0] !== '/') {

					$ref = '/' . $ref;

				}

				return $ref;

			} elseif (!$local) {

				return $ref;

			}

		}

		return '/';

	}

/**

 * Missing method handler, handles wrapping older style isAjax() type methods

 *

 * @param string $name The method called

 * @param array $params Array of parameters for the method call

 * @return mixed

 * @throws CakeException when an invalid method is called.

 */

	public function __call($name, $params) {

		if (strpos($name, 'is') === 0) {

			$type = strtolower(substr($name, 2));

			return $this->is($type);

		}

		throw new CakeException(__d('cake_dev', 'Method %s does not exist', $name));

	}

/**

 * Magic get method allows access to parsed routing parameters directly on the object.

 *

 * Allows access to `$this->params['controller']` via `$this->controller`

 *

 * @param string $name The property being accessed.

 * @return mixed Either the value of the parameter or null.

 */

	public function __get($name) {

		if (isset($this->params[$name])) {

			return $this->params[$name];

		}

		return null;

	}

/**

 * Magic isset method allows isset/empty checks

 * on routing parameters.

 *

 * @param string $name The property being accessed.

 * @return bool Existence

 */

	public function __isset($name) {

		return isset($this->params[$name]);

	}

/**

 * Check whether or not a Request is a certain type.

 *

 * Uses the built in detection rules as well as additional rules

 * defined with CakeRequest::addDetector(). Any detector can be called

 * as `is($type)` or `is$Type()`.

 *

 * @param string|array $type The type of request you want to check. If an array

 *   this method will return true if the request matches any type.

 * @return bool Whether or not the request is the type you are checking.

 */

	public function is($type) {

		if (is_array($type)) {

			$result = array_map(array($this, 'is'), $type);

			return count(array_filter($result)) > 0;

		}

		$type = strtolower($type);

		if (!isset($this->_detectors[$type])) {

			return false;

		}

		$detect = $this->_detectors[$type];

		if (isset($detect['env']) && $this->_environmentDetector($detect)) {

			return true;

		}

		if (isset($detect['header']) && $this->_headerDetector($detect)) {

			return true;

		}

		if (isset($detect['accept']) && $this->_acceptHeaderDetector($detect)) {

			return true;

		}

		if (isset($detect['param']) && $this->_paramDetector($detect)) {

			return true;

		}

		if (isset($detect['callback']) && is_callable($detect['callback'])) {

			return call_user_func($detect['callback'], $this);

		}

		return false;

	}

/**

 * Detects if a URL extension is present.

 *

 * @param array $detect Detector options array.

 * @return bool Whether or not the request is the type you are checking.

 */

	protected function _extensionDetector($detect) {

		if (is_string($detect['extension'])) {

			$detect['extension'] = array($detect['extension']);

		}

		if (in_array($this->params['ext'], $detect['extension'])) {

			return true;

		}

		return false;

	}

/**

 * Detects if a specific accept header is present.

 *

 * @param array $detect Detector options array.

 * @return bool Whether or not the request is the type you are checking.

 */

	protected function _acceptHeaderDetector($detect) {

		$acceptHeaders = explode(',', (string)env('HTTP_ACCEPT'));

		foreach ($detect['accept'] as $header) {

			if (in_array($header, $acceptHeaders)) {

				return true;

			}

		}

		return false;

	}

/**

 * Detects if a specific header is present.

 *

 * @param array $detect Detector options array.

 * @return bool Whether or not the request is the type you are checking.

 */

	protected function _headerDetector($detect) {

		foreach ($detect['header'] as $header => $value) {

			$header = env('HTTP_' . strtoupper($header));

			if (!is_null($header)) {

				if (!is_string($value) && !is_bool($value) && is_callable($value)) {

					return call_user_func($value, $header);

				}

				return ($header === $value);

			}

		}

		return false;

	}

/**

 * Detects if a specific request parameter is present.

 *

 * @param array $detect Detector options array.

 * @return bool Whether or not the request is the type you are checking.

 */

	protected function _paramDetector($detect) {

		$key = $detect['param'];

		if (isset($detect['value'])) {

			$value = $detect['value'];

			return isset($this->params[$key]) ? $this->params[$key] == $value : false;

		}

		if (isset($detect['options'])) {

			return isset($this->params[$key]) ? in_array($this->params[$key], $detect['options']) : false;

		}

		return false;

	}

/**

 * Detects if a specific environment variable is present.

 *

 * @param array $detect Detector options array.

 * @return bool Whether or not the request is the type you are checking.

 */

	protected function _environmentDetector($detect) {

		if (isset($detect['env'])) {

			if (isset($detect['value'])) {

				return env($detect['env']) == $detect['value'];

			}

			if (isset($detect['pattern'])) {

				return (bool)preg_match($detect['pattern'], env($detect['env']));

			}

			if (isset($detect['options'])) {

				$pattern = '/' . implode('|', $detect['options']) . '/i';

				return (bool)preg_match($pattern, env($detect['env']));

			}

		}

		return false;

	}

/**

 * Check that a request matches all the given types.

 *

 * Allows you to test multiple types and union the results.

 * See CakeRequest::is() for how to add additional types and the

 * built-in types.

 *

 * @param array $types The types to check.

 * @return bool Success.

 * @see CakeRequest::is()

 */

	public function isAll(array $types) {

		$result = array_filter(array_map(array($this, 'is'), $types));

		return count($result) === count($types);

	}

/**

 * Add a new detector to the list of detectors that a request can use.

 * There are several different formats and types of detectors that can be set.

 *

 * ### Environment value comparison

 *

 * An environment value comparison, compares a value fetched from `env()` to a known value

 * the environment value is equality checked against the provided value.

 *

 * e.g `addDetector('post', array('env' => 'REQUEST_METHOD', 'value' => 'POST'))`

 *

 * ### Pattern value comparison

 *

 * Pattern value comparison allows you to compare a value fetched from `env()` to a regular expression.

 *

 * e.g `addDetector('iphone', array('env' => 'HTTP_USER_AGENT', 'pattern' => '/iPhone/i'));`

 *

 * ### Option based comparison

 *

 * Option based comparisons use a list of options to create a regular expression. Subsequent calls

 * to add an already defined options detector will merge the options.

 *

 * e.g `addDetector('mobile', array('env' => 'HTTP_USER_AGENT', 'options' => array('Fennec')));`

 *

 * ### Callback detectors

 *

 * Callback detectors allow you to provide a 'callback' type to handle the check. The callback will

 * receive the request object as its only parameter.

 *

 * e.g `addDetector('custom', array('callback' => array('SomeClass', 'somemethod')));`

 *

 * ### Request parameter detectors

 *

 * Allows for custom detectors on the request parameters.

 *

 * e.g `addDetector('requested', array('param' => 'requested', 'value' => 1)`

 *

 * You can also make parameter detectors that accept multiple values

 * using the `options` key. This is useful when you want to check

 * if a request parameter is in a list of options.

 *

 * `addDetector('extension', array('param' => 'ext', 'options' => array('pdf', 'csv'))`

 *

 * @param string $name The name of the detector.

 * @param array $options The options for the detector definition. See above.

 * @return void

 */

	public function addDetector($name, $options) {

		$name = strtolower($name);

		if (isset($this->_detectors[$name]) && isset($options['options'])) {

			$options = Hash::merge($this->_detectors[$name], $options);

		}

		$this->_detectors[$name] = $options;

	}

/**

 * Add parameters to the request's parsed parameter set. This will overwrite any existing parameters.

 * This modifies the parameters available through `$request->params`.

 *

 * @param array $params Array of parameters to merge in

 * @return $this

 */

	public function addParams($params) {

		$this->params = array_merge($this->params, (array)$params);

		return $this;

	}

/**

 * Add paths to the requests' paths vars. This will overwrite any existing paths.

 * Provides an easy way to modify, here, webroot and base.

 *

 * @param array $paths Array of paths to merge in

 * @return $this

 */

	public function addPaths($paths) {

		foreach (array('webroot', 'here', 'base') as $element) {

			if (isset($paths[$element])) {

				$this->{$element} = $paths[$element];

			}

		}

		return $this;

	}

/**

 * Get the value of the current requests URL. Will include named parameters and querystring arguments.

 *

 * @param bool $base Include the base path, set to false to trim the base path off.

 * @return string the current request URL including query string args.

 */

	public function here($base = true) {

		$url = $this->here;

		if (!empty($this->query)) {

			$url .= '?' . http_build_query($this->query, null, '&');

		}

		if (!$base) {

			$url = preg_replace('/^' . preg_quote($this->base, '/') . '/', '', $url, 1);

		}

		return $url;

	}

/**

 * Read an HTTP header from the Request information.

 *

 * @param string $name Name of the header you want.

 * @return mixed Either false on no header being set or the value of the header.

 */

	public static function header($name) {

		$name = 'HTTP_' . strtoupper(str_replace('-', '_', $name));

		if (isset($_SERVER[$name])) {

			return $_SERVER[$name];

		}

		return false;

	}

/**

 * Get the HTTP method used for this request.

 * There are a few ways to specify a method.

 *

 * - If your client supports it you can use native HTTP methods.

 * - You can set the HTTP-X-Method-Override header.

 * - You can submit an input with the name `_method`

 *

 * Any of these 3 approaches can be used to set the HTTP method used

 * by CakePHP internally, and will effect the result of this method.

 *

 * @return string The name of the HTTP method used.

 */

	public function method() {

		return env('REQUEST_METHOD');

	}

/**

 * Get the host that the request was handled on.

 *

 * @param bool $trustProxy Whether or not to trust the proxy host.

 * @return string

 */

	public function host($trustProxy = false) {

		if ($trustProxy) {

			return env('HTTP_X_FORWARDED_HOST');

		}

		return env('HTTP_HOST');

	}

/**

 * Get the domain name and include $tldLength segments of the tld.

 *

 * @param int $tldLength Number of segments your tld contains. For example: `example.com` contains 1 tld.

 *   While `example.co.uk` contains 2.

 * @return string Domain name without subdomains.

 */

	public function domain($tldLength = 1) {

		$segments = explode('.', $this->host());

		$domain = array_slice($segments, -1 * ($tldLength + 1));

		return implode('.', $domain);

	}

/**

 * Get the subdomains for a host.

 *

 * @param int $tldLength Number of segments your tld contains. For example: `example.com` contains 1 tld.

 *   While `example.co.uk` contains 2.

 * @return array An array of subdomains.

 */

	public function subdomains($tldLength = 1) {

		$segments = explode('.', $this->host());

		return array_slice($segments, 0, -1 * ($tldLength + 1));

	}

/**

 * Find out which content types the client accepts or check if they accept a

 * particular type of content.

 *

 * #### Get all types:

 *

 * `$this->request->accepts();`

 *

 * #### Check for a single type:

 *

 * `$this->request->accepts('application/json');`

 *

 * This method will order the returned content types by the preference values indicated

 * by the client.

 *

 * @param string $type The content type to check for. Leave null to get all types a client accepts.

 * @return mixed Either an array of all the types the client accepts or a boolean if they accept the

 *   provided type.

 */

	public function accepts($type = null) {

		$raw = $this->parseAccept();

		$accept = array();

		foreach ($raw as $types) {

			$accept = array_merge($accept, $types);

		}

		if ($type === null) {

			return $accept;

		}

		return in_array($type, $accept);

	}

/**

 * Parse the HTTP_ACCEPT header and return a sorted array with content types

 * as the keys, and pref values as the values.

 *

 * Generally you want to use CakeRequest::accept() to get a simple list

 * of the accepted content types.

 *

 * @return array An array of prefValue => array(content/types)

 */

	public function parseAccept() {

		return $this->_parseAcceptWithQualifier($this->header('accept'));

	}

/**

 * Get the languages accepted by the client, or check if a specific language is accepted.

 *

 * Get the list of accepted languages:

 *

 * ``` CakeRequest::acceptLanguage(); ```

 *

 * Check if a specific language is accepted:

 *

 * ``` CakeRequest::acceptLanguage('es-es'); ```

 *

 * @param string $language The language to test.

 * @return mixed If a $language is provided, a boolean. Otherwise the array of accepted languages.

 */

	public static function acceptLanguage($language = null) {

		$raw = static::_parseAcceptWithQualifier(static::header('Accept-Language'));

		$accept = array();

		foreach ($raw as $languages) {

			foreach ($languages as &$lang) {

				if (strpos($lang, '_')) {

					$lang = str_replace('_', '-', $lang);

				}

				$lang = strtolower($lang);

			}

			$accept = array_merge($accept, $languages);

		}

		if ($language === null) {

			return $accept;

		}

		return in_array(strtolower($language), $accept);

	}

/**

 * Parse Accept* headers with qualifier options.

 *

 * Only qualifiers will be extracted, any other accept extensions will be

 * discarded as they are not frequently used.

 *

 * @param string $header Header to parse.

 * @return array

 */

	protected static function _parseAcceptWithQualifier($header) {

		$accept = array();

		$header = explode(',', $header);

		foreach (array_filter($header) as $value) {

			$prefValue = '1.0';

			$value = trim($value);

			$semiPos = strpos($value, ';');

			if ($semiPos !== false) {

				$params = explode(';', $value);

				$value = trim($params[0]);

				foreach ($params as $param) {

					$qPos = strpos($param, 'q=');

					if ($qPos !== false) {

						$prefValue = substr($param, $qPos + 2);

					}

				}

			}

			if (!isset($accept[$prefValue])) {

				$accept[$prefValue] = array();

			}

			if ($prefValue) {

				$accept[$prefValue][] = $value;

			}

		}

		krsort($accept);

		return $accept;

	}

/**

 * Provides a read accessor for `$this->query`. Allows you

 * to use a syntax similar to `CakeSession` for reading URL query data.

 *

 * @param string $name Query string variable name

 * @return mixed The value being read

 */

	public function query($name) {

		return Hash::get($this->query, $name);

	}

/**

 * Provides a read/write accessor for `$this->data`. Allows you

 * to use a syntax similar to `CakeSession` for reading post data.

 *

 * ## Reading values.

 *

 * `$request->data('Post.title');`

 *

 * When reading values you will get `null` for keys/values that do not exist.

 *

 * ## Writing values

 *

 * `$request->data('Post.title', 'New post!');`

 *

 * You can write to any value, even paths/keys that do not exist, and the arrays

 * will be created for you.

 *

 * @param string $name Dot separated name of the value to read/write, one or more args.

 * @return mixed|$this Either the value being read, or $this so you can chain consecutive writes.

 */

	public function data($name) {

		$args = func_get_args();

		if (count($args) === 2) {

			$this->data = Hash::insert($this->data, $name, $args[1]);

			return $this;

		}

		return Hash::get($this->data, $name);

	}

/**

 * Safely access the values in $this->params.

 *

 * @param string $name The name of the parameter to get.

 * @return mixed The value of the provided parameter. Will

 *   return false if the parameter doesn't exist or is falsey.

 */

	public function param($name) {

		$args = func_get_args();

		if (count($args) === 2) {

			$this->params = Hash::insert($this->params, $name, $args[1]);

			return $this;

		}

		if (!isset($this->params[$name])) {

			return Hash::get($this->params, $name, false);

		}

		return $this->params[$name];

	}

/**

 * Read data from `php://input`. Useful when interacting with XML or JSON

 * request body content.

 *

 * Getting input with a decoding function:

 *

 * `$this->request->input('json_decode');`

 *

 * Getting input using a decoding function, and additional params:

 *

 * `$this->request->input('Xml::build', array('return' => 'DOMDocument'));`

 *

 * Any additional parameters are applied to the callback in the order they are given.

 *

 * @param string $callback A decoding callback that will convert the string data to another

 *     representation. Leave empty to access the raw input data. You can also

 *     supply additional parameters for the decoding callback using var args, see above.

 * @return The decoded/processed request data.

 */

	public function input($callback = null) {

		$input = $this->_readInput();

		$args = func_get_args();

		if (!empty($args)) {

			$callback = array_shift($args);

			array_unshift($args, $input);

			return call_user_func_array($callback, $args);

		}