Subversion Repositories SmartDukaan

<?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 bool
 */
        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 = $this->response->mapType($accept);
                $preferedTypes = current($accepts);
                if (array_intersect($preferedTypes, array('html', 'xhtml'))) {
                        return;
                }

                $extensions = Router::extensions();
                foreach ($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 $xml XML string.
 * @return array Xml array data
 */
        public function convertXml($xml) {
                try {
                        $xml = Xml::build($xml, array('readFile' => false));
                        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 int|array $status HTTP Status for redirect
 * @param bool $exit Whether to exit script, defaults to `true`.
 * @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.
 *
 * @param Controller $controller Controller instance.
 * @return bool 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 bool True if call is Ajax
 * @deprecated 3.0.0 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 bool True if call is from Flash
 * @deprecated 3.0.0 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 bool True if call is over HTTPS
 * @deprecated 3.0.0 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 bool 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 bool 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 bool 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 bool 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 bool
 */
        public function isWap() {
                return $this->prefers('wap');
        }

/**
 * Returns true if the current call a POST request
 *
 * @return bool True if call is a POST
 * @deprecated 3.0.0 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 bool True if call is a PUT
 * @deprecated 3.0.0 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 bool True if call is a GET
 * @deprecated 3.0.0 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 bool True if call is a DELETE
 * @deprecated 3.0.0 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|bool 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 $type The Content-type or array of Content-types assigned to the name,
 *    i.e. "text/html", or "application/xml"
 * @return void
 * @deprecated 3.0.0 Use `$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 3.0.0 Use $this->request->referer() from your controller instead
 */
        public function getReferer() {
                return $this->request->referer(false);
        }

/**
 * Gets remote client IP
 *
 * @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 Client IP address
 * @deprecated 3.0.0 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') && !$this->request->is('delete')) {
                        return null;
                }
                if (is_array($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 += $defaults;

                if ($type === 'ajax') {
                        $controller->layout = $this->ajaxLayout;
                        return $this->respondAs('html', $options);
                }

                $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 bool 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 3.0.0 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 $alias String alias to convert back into a content type. Or an array of aliases to map.
 * @return string|null Null on an undefined alias. String value of the mapped alias type. If an
 *   alias maps to more than one content type, the first one will be returned.
 */
        public function mapAlias($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;
        }

}