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<?php

/**

 * Request object for handling alternative HTTP requests

 *

 * Alternative HTTP requests can come from wireless units like mobile phones, palmtop computers,

 * and the like. These units have no use for Ajax requests, and this Component can tell how Cake

 * should respond to the different needs of a handheld computer and a desktop machine.

 *

 * 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

 * @package       Cake.Controller.Component

 * @since         CakePHP(tm) v 0.10.4.1076

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

 */

App::uses('Component', 'Controller');

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

/**

 * Request object for handling alternative HTTP requests

 *

 * Alternative HTTP requests can come from wireless units like mobile phones, palmtop computers,

 * and the like. These units have no use for Ajax requests, and this Component can tell how Cake

 * should respond to the different needs of a handheld computer and a desktop machine.

 *

 * @package       Cake.Controller.Component

 * @link http://book.cakephp.org/2.0/en/core-libraries/components/request-handling.html

 *

 */

class RequestHandlerComponent extends Component {

/**

 * The layout that will be switched to for Ajax requests

 *

 * @var string

 * @see RequestHandler::setAjax()

 */

	public $ajaxLayout = 'ajax';

/**

 * Determines whether or not callbacks will be fired on this component

 *

 * @var boolean

 */

	public $enabled = true;

/**

 * Holds the reference to Controller::$request

 *

 * @var CakeRequest

 */

	public $request;

/**

 * Holds the reference to Controller::$response

 *

 * @var CakeResponse

 */

	public $response;

/**

 * Contains the file extension parsed out by the Router

 *

 * @var string

 * @see Router::parseExtensions()

 */

	public $ext = null;

/**

 * The template to use when rendering the given content type.

 *

 * @var string

 */

	protected $_renderType = null;

/**

 * A mapping between extensions and deserializers for request bodies of that type.

 * By default only JSON and XML are mapped, use RequestHandlerComponent::addInputType()

 *

 * @var array

 */

	protected $_inputTypeMap = array(

		'json' => array('json_decode', true)

	);

/**

 * A mapping between type and viewClass

 * By default only JSON and XML are mapped, use RequestHandlerComponent::viewClassMap()

 *

 * @var array

 */

	protected $_viewClassMap = array(

		'json' => 'Json',

		'xml' => 'Xml'

	);

/**

 * Constructor. Parses the accepted content types accepted by the client using HTTP_ACCEPT

 *

 * @param ComponentCollection $collection ComponentCollection object.

 * @param array $settings Array of settings.

 */

	public function __construct(ComponentCollection $collection, $settings = array()) {

		parent::__construct($collection, $settings + array('checkHttpCache' => true));

		$this->addInputType('xml', array(array($this, 'convertXml')));

		$Controller = $collection->getController();

		$this->request = $Controller->request;

		$this->response = $Controller->response;

	}

/**

 * Checks to see if a file extension has been parsed by the Router, or if the

 * HTTP_ACCEPT_TYPE has matches only one content type with the supported extensions.

 * If there is only one matching type between the supported content types & extensions,

 * and the requested mime-types, RequestHandler::$ext is set to that value.

 *

 * @param Controller $controller A reference to the controller

 * @return void

 * @see Router::parseExtensions()

 */

	public function initialize(Controller $controller) {

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

			$this->ext = $this->request->params['ext'];

		}

		if (empty($this->ext) || $this->ext === 'html') {

			$this->_setExtension();

		}

		$this->params = $controller->params;

		if (!empty($this->settings['viewClassMap'])) {

			$this->viewClassMap($this->settings['viewClassMap']);

		}

	}

/**

 * Set the extension based on the accept headers.

 * Compares the accepted types and configured extensions.

 * If there is one common type, that is assigned as the ext/content type

 * for the response.

 * Type with the highest weight will be set. If the highest weight has more

 * then one type matching the extensions, the order in which extensions are specified

 * determines which type will be set.

 *

 * If html is one of the preferred types, no content type will be set, this

 * is to avoid issues with browsers that prefer html and several other content types.

 *

 * @return void

 */

	protected function _setExtension() {

		$accept = $this->request->parseAccept();

		if (empty($accept)) {

			return;

		}

		$accepts = $this->response->mapType($this->request->parseAccept());

		$preferedTypes = current($accepts);

		if (array_intersect($preferedTypes, array('html', 'xhtml'))) {

			return null;

		}

		$extensions = Router::extensions();

		foreach ($accepts as $types) {

			$ext = array_intersect($extensions, $types);

			if ($ext) {

				$this->ext = current($ext);

				break;

			}

		}

	}

/**

 * The startup method of the RequestHandler enables several automatic behaviors

 * related to the detection of certain properties of the HTTP request, including:

 *

 * - Disabling layout rendering for Ajax requests (based on the HTTP_X_REQUESTED_WITH header)

 * - If Router::parseExtensions() is enabled, the layout and template type are

 *   switched based on the parsed extension or Accept-Type header. For example, if `controller/action.xml`

 *   is requested, the view path becomes `app/View/Controller/xml/action.ctp`. Also if

 *   `controller/action` is requested with `Accept-Type: application/xml` in the headers

 *   the view path will become `app/View/Controller/xml/action.ctp`. Layout and template

 *   types will only switch to mime-types recognized by CakeResponse. If you need to declare

 *   additional mime-types, you can do so using CakeResponse::type() in your controllers beforeFilter()

 *   method.

 * - If a helper with the same name as the extension exists, it is added to the controller.

 * - If the extension is of a type that RequestHandler understands, it will set that

 *   Content-type in the response header.

 * - If the XML data is POSTed, the data is parsed into an XML object, which is assigned

 *   to the $data property of the controller, which can then be saved to a model object.

 *

 * @param Controller $controller A reference to the controller

 * @return void

 */

	public function startup(Controller $controller) {

		$controller->request->params['isAjax'] = $this->request->is('ajax');

		$isRecognized = (

			!in_array($this->ext, array('html', 'htm')) &&

			$this->response->getMimeType($this->ext)

		);

		if (!empty($this->ext) && $isRecognized) {

			$this->renderAs($controller, $this->ext);

		} elseif ($this->request->is('ajax')) {

			$this->renderAs($controller, 'ajax');

		} elseif (empty($this->ext) || in_array($this->ext, array('html', 'htm'))) {

			$this->respondAs('html', array('charset' => Configure::read('App.encoding')));

		}

		foreach ($this->_inputTypeMap as $type => $handler) {

			if ($this->requestedWith($type)) {

				$input = call_user_func_array(array($controller->request, 'input'), $handler);

				$controller->request->data = $input;

			}

		}

	}

/**

 * Helper method to parse xml input data, due to lack of anonymous functions

 * this lives here.

 *

 * @param string $xml

 * @return array Xml array data

 */

	public function convertXml($xml) {

		try {

			$xml = Xml::build($xml);

			if (isset($xml->data)) {

				return Xml::toArray($xml->data);

			}

			return Xml::toArray($xml);

		} catch (XmlException $e) {

			return array();

		}

	}

/**

 * Handles (fakes) redirects for Ajax requests using requestAction()

 * Modifies the $_POST and $_SERVER['REQUEST_METHOD'] to simulate a new GET request.

 *

 * @param Controller $controller A reference to the controller

 * @param string|array $url A string or array containing the redirect location

 * @param integer|array $status HTTP Status for redirect

 * @param boolean $exit

 * @return void

 */

	public function beforeRedirect(Controller $controller, $url, $status = null, $exit = true) {

		if (!$this->request->is('ajax')) {

			return;

		}

		if (empty($url)) {

			return;

		}

		$_SERVER['REQUEST_METHOD'] = 'GET';

		foreach ($_POST as $key => $val) {

			unset($_POST[$key]);

		}

		if (is_array($url)) {

			$url = Router::url($url + array('base' => false));

		}

		if (!empty($status)) {

			$statusCode = $this->response->httpCodes($status);

			$code = key($statusCode);

			$this->response->statusCode($code);

		}

		$this->response->body($this->requestAction($url, array('return', 'bare' => false)));

		$this->response->send();

		$this->_stop();

	}

/**

 * Checks if the response can be considered different according to the request

 * headers, and the caching response headers. If it was not modified, then the

 * render process is skipped. And the client will get a blank response with a

 * "304 Not Modified" header.

 *

 * @params Controller $controller

 * @return boolean false if the render process should be aborted

 */

	public function beforeRender(Controller $controller) {

		if ($this->settings['checkHttpCache'] && $this->response->checkNotModified($this->request)) {

			return false;

		}

	}

/**

 * Returns true if the current HTTP request is Ajax, false otherwise

 *

 * @return boolean True if call is Ajax

 * @deprecated use `$this->request->is('ajax')` instead.

 */

	public function isAjax() {

		return $this->request->is('ajax');

	}

/**

 * Returns true if the current HTTP request is coming from a Flash-based client

 *

 * @return boolean True if call is from Flash

 * @deprecated use `$this->request->is('flash')` instead.

 */

	public function isFlash() {

		return $this->request->is('flash');

	}

/**

 * Returns true if the current request is over HTTPS, false otherwise.

 *

 * @return boolean True if call is over HTTPS

 * @deprecated use `$this->request->is('ssl')` instead.

 */

	public function isSSL() {

		return $this->request->is('ssl');

	}

/**

 * Returns true if the current call accepts an XML response, false otherwise

 *

 * @return boolean True if client accepts an XML response

 */

	public function isXml() {

		return $this->prefers('xml');

	}

/**

 * Returns true if the current call accepts an RSS response, false otherwise

 *

 * @return boolean True if client accepts an RSS response

 */

	public function isRss() {

		return $this->prefers('rss');

	}

/**

 * Returns true if the current call accepts an Atom response, false otherwise

 *

 * @return boolean True if client accepts an RSS response

 */

	public function isAtom() {

		return $this->prefers('atom');

	}

/**

 * Returns true if user agent string matches a mobile web browser, or if the

 * client accepts WAP content.

 *

 * @return boolean True if user agent is a mobile web browser

 */

	public function isMobile() {

		return $this->request->is('mobile') || $this->accepts('wap');

	}

/**

 * Returns true if the client accepts WAP content

 *

 * @return boolean

 */

	public function isWap() {

		return $this->prefers('wap');

	}

/**

 * Returns true if the current call a POST request

 *

 * @return boolean True if call is a POST

 * @deprecated Use $this->request->is('post'); from your controller.

 */

	public function isPost() {

		return $this->request->is('post');

	}

/**

 * Returns true if the current call a PUT request

 *

 * @return boolean True if call is a PUT

 * @deprecated Use $this->request->is('put'); from your controller.

 */

	public function isPut() {

		return $this->request->is('put');

	}

/**

 * Returns true if the current call a GET request

 *

 * @return boolean True if call is a GET

 * @deprecated Use $this->request->is('get'); from your controller.

 */

	public function isGet() {

		return $this->request->is('get');

	}

/**

 * Returns true if the current call a DELETE request

 *

 * @return boolean True if call is a DELETE

 * @deprecated Use $this->request->is('delete'); from your controller.

 */

	public function isDelete() {

		return $this->request->is('delete');

	}

/**

 * Gets Prototype version if call is Ajax, otherwise empty string.

 * The Prototype library sets a special "Prototype version" HTTP header.

 *

 * @return string|boolean When Ajax the prototype version of component making the call otherwise false

 */

	public function getAjaxVersion() {

		$httpX = env('HTTP_X_PROTOTYPE_VERSION');

		return ($httpX === null) ? false : $httpX;

	}

/**

 * Adds/sets the Content-type(s) for the given name. This method allows

 * content-types to be mapped to friendly aliases (or extensions), which allows

 * RequestHandler to automatically respond to requests of that type in the

 * startup method.

 *

 * @param string $name The name of the Content-type, i.e. "html", "xml", "css"

 * @param string|array $type The Content-type or array of Content-types assigned to the name,

 *    i.e. "text/html", or "application/xml"

 * @return void

 * @deprecated use `$this->response->type()` instead.

 */

	public function setContent($name, $type = null) {

		$this->response->type(array($name => $type));

	}

/**

 * Gets the server name from which this request was referred

 *

 * @return string Server address

 * @deprecated use $this->request->referer() from your controller instead

 */

	public function getReferer() {

		return $this->request->referer(false);

	}

/**

 * Gets remote client IP

 *

 * @param boolean $safe

 * @return string Client IP address

 * @deprecated use $this->request->clientIp() from your,  controller instead.

 */

	public function getClientIP($safe = true) {

		return $this->request->clientIp($safe);

	}

/**

 * Determines which content types the client accepts. Acceptance is based on

 * the file extension parsed by the Router (if present), and by the HTTP_ACCEPT

 * header. Unlike CakeRequest::accepts() this method deals entirely with mapped content types.

 *

 * Usage:

 *

 * `$this->RequestHandler->accepts(array('xml', 'html', 'json'));`

 *

 * Returns true if the client accepts any of the supplied types.

 *

 * `$this->RequestHandler->accepts('xml');`

 *

 * Returns true if the client accepts xml.

 *

 * @param string|array $type Can be null (or no parameter), a string type name, or an

 *   array of types

 * @return mixed If null or no parameter is passed, returns an array of content

 *   types the client accepts. If a string is passed, returns true

 *   if the client accepts it. If an array is passed, returns true

 *   if the client accepts one or more elements in the array.

 * @see RequestHandlerComponent::setContent()

 */

	public function accepts($type = null) {

		$accepted = $this->request->accepts();

		if (!$type) {

			return $this->mapType($accepted);

		}

		if (is_array($type)) {

			foreach ($type as $t) {

				$t = $this->mapAlias($t);

				if (in_array($t, $accepted)) {

					return true;

				}

			}

			return false;

		}

		if (is_string($type)) {

			return in_array($this->mapAlias($type), $accepted);

		}

		return false;

	}

/**

 * Determines the content type of the data the client has sent (i.e. in a POST request)

 *

 * @param string|array $type Can be null (or no parameter), a string type name, or an array of types

 * @return mixed If a single type is supplied a boolean will be returned. If no type is provided

 *   The mapped value of CONTENT_TYPE will be returned. If an array is supplied the first type

 *   in the request content type will be returned.

 */

	public function requestedWith($type = null) {

		if (!$this->request->is('post') && !$this->request->is('put')) {

			return null;

		}

		if (is_array($type)) {

			foreach ($type as $t) {

				if ($this->requestedWith($t)) {

					return $t;

				}

			}

			return false;

		}

		list($contentType) = explode(';', env('CONTENT_TYPE'));

		if ($contentType === '') {

			list($contentType) = explode(';', CakeRequest::header('CONTENT_TYPE'));

		}

		if (!$type) {

			return $this->mapType($contentType);

		}

		if (is_string($type)) {

			return ($type == $this->mapType($contentType));

		}

	}

/**

 * Determines which content-types the client prefers. If no parameters are given,

 * the single content-type that the client most likely prefers is returned. If $type is

 * an array, the first item in the array that the client accepts is returned.

 * Preference is determined primarily by the file extension parsed by the Router

 * if provided, and secondarily by the list of content-types provided in

 * HTTP_ACCEPT.

 *

 * @param string|array $type An optional array of 'friendly' content-type names, i.e.

 *   'html', 'xml', 'js', etc.

 * @return mixed If $type is null or not provided, the first content-type in the

 *    list, based on preference, is returned. If a single type is provided

 *    a boolean will be returned if that type is preferred.

 *    If an array of types are provided then the first preferred type is returned.

 *    If no type is provided the first preferred type is returned.

 * @see RequestHandlerComponent::setContent()

 */

	public function prefers($type = null) {

		$acceptRaw = $this->request->parseAccept();

		if (empty($acceptRaw)) {

			return $this->ext;

		}

		$accepts = $this->mapType(array_shift($acceptRaw));

		if (!$type) {

			if (empty($this->ext) && !empty($accepts)) {

				return $accepts[0];

			}

			return $this->ext;

		}

		$types = (array)$type;

		if (count($types) === 1) {

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

				return in_array($this->ext, $types);

			}

			return in_array($types[0], $accepts);

		}

		$intersect = array_values(array_intersect($accepts, $types));

		if (empty($intersect)) {

			return false;

		}

		return $intersect[0];

	}

/**

 * Sets the layout and template paths for the content type defined by $type.

 *

 * ### Usage:

 *

 * Render the response as an 'ajax' response.

 *

 * `$this->RequestHandler->renderAs($this, 'ajax');`

 *

 * Render the response as an xml file and force the result as a file download.

 *

 * `$this->RequestHandler->renderAs($this, 'xml', array('attachment' => 'myfile.xml');`

 *

 * @param Controller $controller A reference to a controller object

 * @param string $type Type of response to send (e.g: 'ajax')

 * @param array $options Array of options to use

 * @return void

 * @see RequestHandlerComponent::setContent()

 * @see RequestHandlerComponent::respondAs()

 */

	public function renderAs(Controller $controller, $type, $options = array()) {

		$defaults = array('charset' => 'UTF-8');

		if (Configure::read('App.encoding') !== null) {

			$defaults['charset'] = Configure::read('App.encoding');

		}

		$options = array_merge($defaults, $options);

		if ($type === 'ajax') {

			$controller->layout = $this->ajaxLayout;

			return $this->respondAs('html', $options);

		}

		$controller->ext = '.ctp';

		$pluginDot = null;

		$viewClassMap = $this->viewClassMap();

		if (array_key_exists($type, $viewClassMap)) {

			list($pluginDot, $viewClass) = pluginSplit($viewClassMap[$type], true);

		} else {

			$viewClass = Inflector::classify($type);

		}

		$viewName = $viewClass . 'View';

		if (!class_exists($viewName)) {

			App::uses($viewName, $pluginDot . 'View');

		}

		if (class_exists($viewName)) {

			$controller->viewClass = $viewClass;

		} elseif (empty($this->_renderType)) {

			$controller->viewPath .= DS . $type;

		} else {

			$controller->viewPath = preg_replace(

				"/([\/\\\\]{$this->_renderType})$/",

				DS . $type,

				$controller->viewPath

			);

		}

		$this->_renderType = $type;

		$controller->layoutPath = $type;

		if ($this->response->getMimeType($type)) {

			$this->respondAs($type, $options);

		}

		$helper = ucfirst($type);

		if (!in_array($helper, $controller->helpers) && empty($controller->helpers[$helper])) {

			App::uses('AppHelper', 'View/Helper');

			App::uses($helper . 'Helper', 'View/Helper');

			if (class_exists($helper . 'Helper')) {

				$controller->helpers[] = $helper;

			}

		}

	}

/**

 * Sets the response header based on type map index name. This wraps several methods

 * available on CakeResponse. It also allows you to use Content-Type aliases.

 *

 * @param string|array $type Friendly type name, i.e. 'html' or 'xml', or a full content-type,

 *    like 'application/x-shockwave'.

 * @param array $options If $type is a friendly type name that is associated with

 *    more than one type of content, $index is used to select which content-type to use.

 * @return boolean Returns false if the friendly type name given in $type does

 *    not exist in the type map, or if the Content-type header has

 *    already been set by this method.

 * @see RequestHandlerComponent::setContent()

 */

	public function respondAs($type, $options = array()) {

		$defaults = array('index' => null, 'charset' => null, 'attachment' => false);

		$options = $options + $defaults;

		$cType = $type;

		if (strpos($type, '/') === false) {

			$cType = $this->response->getMimeType($type);

		}

		if (is_array($cType)) {

			if (isset($cType[$options['index']])) {

				$cType = $cType[$options['index']];

			}

			if ($this->prefers($cType)) {

				$cType = $this->prefers($cType);

			} else {

				$cType = $cType[0];

			}

		}

		if (!$type) {

			return false;

		}

		if (empty($this->request->params['requested'])) {

			$this->response->type($cType);

		}

		if (!empty($options['charset'])) {

			$this->response->charset($options['charset']);

		}

		if (!empty($options['attachment'])) {

			$this->response->download($options['attachment']);

		}

		return true;

	}

/**

 * Returns the current response type (Content-type header), or null if not alias exists

 *

 * @return mixed A string content type alias, or raw content type if no alias map exists,

 *	otherwise null

 */

	public function responseType() {

		return $this->mapType($this->response->type());

	}

/**

 * Maps a content-type back to an alias

 *

 * @param string|array $cType Either a string content type to map, or an array of types.

 * @return string|array Aliases for the types provided.

 * @deprecated Use $this->response->mapType() in your controller instead.

 */

	public function mapType($cType) {

		return $this->response->mapType($cType);

	}

/**

 * Maps a content type alias back to its mime-type(s)

 *

 * @param string|array $alias String alias to convert back into a content type. Or an array of aliases to map.

 * @return string Null on an undefined alias. String value of the mapped alias type. If an

 *   alias maps to more than one content type, the first one will be returned.

 */

	public function mapAlias($alias) {

		if (is_array($alias)) {

			return array_map(array($this, 'mapAlias'), $alias);

		}

		$type = $this->response->getMimeType($alias);

		if ($type) {

			if (is_array($type)) {

				return $type[0];

			}

			return $type;

		}

		return null;

	}

/**

 * Add a new mapped input type. Mapped input types are automatically

 * converted by RequestHandlerComponent during the startup() callback.

 *

 * @param string $type The type alias being converted, ie. json

 * @param array $handler The handler array for the type. The first index should

 *    be the handling callback, all other arguments should be additional parameters

 *    for the handler.

 * @return void

 * @throws CakeException

 */

	public function addInputType($type, $handler) {

		if (!is_array($handler) || !isset($handler[0]) || !is_callable($handler[0])) {

			throw new CakeException(__d('cake_dev', 'You must give a handler callback.'));

		}

		$this->_inputTypeMap[$type] = $handler;

	}

/**

 * Getter/setter for viewClassMap

 *

 * @param array|string $type The type string or array with format `array('type' => 'viewClass')` to map one or more

 * @param array $viewClass The viewClass to be used for the type without `View` appended

 * @return array|string Returns viewClass when only string $type is set, else array with viewClassMap

 */

	public function viewClassMap($type = null, $viewClass = null) {

		if (!$viewClass && is_string($type) && isset($this->_viewClassMap[$type])) {

			return $this->_viewClassMap[$type];

		}

		if (is_string($type)) {

			$this->_viewClassMap[$type] = $viewClass;

		} elseif (is_array($type)) {

			foreach ($type as $key => $value) {

				$this->viewClassMap($key, $value);

			}

		}

		return $this->_viewClassMap;

	}

}