Controller.php

<?php
/**
 * 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         0.2.9
 * @license       http://www.opensource.org/licenses/mit-license.php MIT License
 */
namespace Cake\Controller;

use Cake\Controller\Exception\MissingActionException;
use Cake\Datasource\ModelAwareTrait;
use Cake\Event\Event;
use Cake\Event\EventListenerInterface;
use Cake\Event\EventManagerTrait;
use Cake\Log\LogTrait;
use Cake\Network\Request;
use Cake\Network\Response;
use Cake\ORM\TableRegistry;
use Cake\Routing\RequestActionTrait;
use Cake\Routing\Router;
use Cake\Utility\Inflector;
use Cake\Utility\MergeVariablesTrait;
use Cake\View\ViewVarsTrait;
use LogicException;
use ReflectionException;
use ReflectionMethod;

/**
 * Application controller class for organization of business logic.
 * Provides basic functionality, such as rendering views inside layouts,
 * automatic model availability, redirection, callbacks, and more.
 *
 * Controllers should provide a number of 'action' methods. These are public
 * methods on a controller that are not inherited from `Controller`.
 * Each action serves as an endpoint for performing a specific action on a
 * resource or collection of resources. For example adding or editing a new
 * object, or listing a set of objects.
 *
 * You can access request parameters, using `$this->request`. The request object
 * contains all the POST, GET and FILES that were part of the request.
 *
 * After performing the required action, controllers are responsible for
 * creating a response. This usually takes the form of a generated `View`, or
 * possibly a redirection to another URL. In either case `$this->response`
 * allows you to manipulate all aspects of the response.
 *
 * Controllers are created by `Dispatcher` based on request parameters and
 * routing. By default controllers and actions use conventional names.
 * For example `/posts/index` maps to `PostsController::index()`. You can re-map
 * URLs using Router::connect() or RouterBuilder::connect().
 *
 * ### Life cycle callbacks
 *
 * CakePHP fires a number of life cycle callbacks during each request.
 * By implementing a method you can receive the related events. The available
 * callbacks are:
 *
 * - `beforeFilter(Event $event)`
 *   Called before each action. This is a good place to do general logic that
 *   applies to all actions.
 * - `beforeRender(Event $event)`
 *   Called before the view is rendered.
 * - `beforeRedirect(Event $event, $url, Response $response)`
 *    Called before a redirect is done.
 * - `afterFilter(Event $event)`
 *   Called after each action is complete and after the view is rendered.
 *
 * @property      \Cake\Controller\Component\AuthComponent $Auth
 * @property      \Cake\Controller\Component\CookieComponent $Cookie
 * @property      \Cake\Controller\Component\CsrfComponent $Csrf
 * @property      \Cake\Controller\Component\FlashComponent $Flash
 * @property      \Cake\Controller\Component\PaginatorComponent $Paginator
 * @property      \Cake\Controller\Component\RequestHandlerComponent $RequestHandler
 * @property      \Cake\Controller\Component\SecurityComponent $Security
 * @link          http://book.cakephp.org/3.0/en/controllers.html
 */
class Controller implements EventListenerInterface
{

    use EventManagerTrait;
    use LogTrait;
    use MergeVariablesTrait;
    use ModelAwareTrait;
    use RequestActionTrait;
    use ViewVarsTrait;

    /**
     * The name of this controller. Controller names are plural, named after the model they manipulate.
     *
     * Set automatically using conventions in Controller::__construct().
     *
     * @var string
     */
    public $name = null;

    /**
     * An array containing the names of helpers this controller uses. The array elements should
     * not contain the "Helper" part of the class name.
     *
     * Example: `public $helpers = ['Form', 'Html', 'Time'];`
     *
     * @var mixed
     * @link http://book.cakephp.org/3.0/en/controllers.html#configuring-helpers-to-load
     */
    public $helpers = [];

    /**
     * An instance of a Cake\Network\Request object that contains information about the current request.
     * This object contains all the information about a request and several methods for reading
     * additional information about the request.
     *
     * @var \Cake\Network\Request
     * @link http://book.cakephp.org/3.0/en/controllers/request-response.html#request
     */
    public $request;

    /**
     * An instance of a Response object that contains information about the impending response
     *
     * @var \Cake\Network\Response
     * @link http://book.cakephp.org/3.0/en/controllers/request-response.html#response
     */
    public $response;

    /**
     * The class name to use for creating the response object.
     *
     * @var string
     */
    protected $_responseClass = 'Cake\Network\Response';

    /**
     * Settings for pagination.
     *
     * Used to pre-configure pagination preferences for the various
     * tables your controller will be paginating.
     *
     * @var array
     * @see \Cake\Controller\Component\PaginatorComponent
     */
    public $paginate = [];

    /**
     * Set to true to automatically render the view
     * after action logic.
     *
     * @var bool
     */
    public $autoRender = true;

    /**
     * Instance of ComponentRegistry used to create Components
     *
     * @var \Cake\Controller\ComponentRegistry
     */
    protected $_components = null;

    /**
     * Array containing the names of components this controller uses. Component names
     * should not contain the "Component" portion of the class name.
     *
     * Example: `public $components = ['Session', 'RequestHandler', 'Acl'];`
     *
     * @var array
     * @link http://book.cakephp.org/3.0/en/controllers/components.html
     */
    public $components = [];

    /**
     * The name of the View class this controller sends output to.
     *
     * @var string
     */
    public $viewClass = null;

    /**
     * The path to this controllers view templates.
     * Example `Articles`
     *
     * Set automatically using conventions in Controller::__construct().
     *
     * @var string
     */
    public $viewPath;

    /**
     * The name of the view file to render. The name specified
     * is the filename in /app/Template/<SubFolder> without the .ctp extension.
     *
     * @var string
     */
    public $view = null;

    /**
     * Instance of the View created during rendering. Won't be set until after
     * Controller::render() is called.
     *
     * @var \Cake\View\View
     */
    public $View;

    /**
     * These Controller properties will be passed from the Controller to the View as options.
     *
     * @var array
     * @see \Cake\View\View
     */
    protected $_validViewOptions = [
        'viewVars', 'autoLayout', 'helpers', 'view', 'layout', 'name', 'theme', 'layoutPath',
        'viewPath', 'plugin', 'passedArgs'
    ];

    /**
     * Automatically set to the name of a plugin.
     *
     * @var string
     */
    public $plugin = null;

    /**
     * Holds all passed params.
     *
     * @var mixed
     */
    public $passedArgs = [];

    /**
     * Constructor.
     *
     * Sets a number of properties based on conventions if they are empty. To override the
     * conventions CakePHP uses you can define properties in your class declaration.
     *
     * @param \Cake\Network\Request|null $request Request object for this controller. Can be null for testing,
     *   but expect that features that use the request parameters will not work.
     * @param \Cake\Network\Response|null $response Response object for this controller.
     * @param string|null $name Override the name useful in testing when using mocks.
     * @param \Cake\Event\EventManager|null $eventManager The event manager. Defaults to a new instance.
     */
    public function __construct(Request $request = null, Response $response = null, $name = null, $eventManager = null)
    {
        if ($this->name === null && $name === null) {
            list(, $name) = namespaceSplit(get_class($this));
            $name = substr($name, 0, -10);
        }
        if ($name !== null) {
            $this->name = $name;
        }

        if (!$this->viewPath) {
            $viewPath = $this->name;
            if (isset($request->params['prefix'])) {
                $prefixes = array_map(
                    'Cake\Utility\Inflector::camelize',
                    explode('/', $request->params['prefix'])
                );
                $viewPath = implode(DS, $prefixes) . DS . $viewPath;
            }
            $this->viewPath = $viewPath;
        }

        if (!($request instanceof Request)) {
            $request = new Request();
        }
        $this->setRequest($request);

        if (!($response instanceof Response)) {
            $response = new Response();
        }
        $this->response = $response;

        if ($eventManager) {
            $this->eventManager($eventManager);
        }

        $this->modelFactory('Table', ['Cake\ORM\TableRegistry', 'get']);
        $modelClass = ($this->plugin ? $this->plugin . '.' : '') . $this->name;
        $this->_setModelClass($modelClass);

        $this->initialize();

        $this->_mergeControllerVars();
        $this->_loadComponents();
        $this->eventManager()->attach($this);
    }

    /**
     * Initialization hook method.
     *
     * Implement this method to avoid having to overwrite
     * the constructor and call parent.
     *
     * @return void
     */
    public function initialize()
    {
    }

    /**
     * Get the component registry for this controller.
     *
     * @return \Cake\Controller\ComponentRegistry
     */
    public function components()
    {
        if ($this->_components === null) {
            $this->_components = new ComponentRegistry($this);
        }
        return $this->_components;
    }

    /**
     * Add a component to the controller's registry.
     *
     * This method will also set the component to a property.
     * For example:
     *
     * `$this->loadComponent('Acl.Acl');`
     *
     * Will result in a `Toolbar` property being set.
     *
     * @param string $name The name of the component to load.
     * @param array $config The config for the component.
     * @return \Cake\Controller\Component
     */
    public function loadComponent($name, array $config = [])
    {
        list(, $prop) = pluginSplit($name);
        $this->{$prop} = $this->components()->load($name, $config);
        return $this->{$prop};
    }

    /**
     * Magic accessor for model autoloading.
     *
     * @param string $name Property name
     * @return bool|object The model instance or false
     */
    public function __get($name)
    {
        list($plugin, $class) = pluginSplit($this->modelClass, true);
        if ($class !== $name) {
            return false;
        }
        return $this->loadModel($plugin . $class);
    }

    /**
     * Sets the request objects and configures a number of controller properties
     * based on the contents of the request. Controller acts as a proxy for certain View variables
     * which must also be updated here. The properties that get set are:
     *
     * - $this->request - To the $request parameter
     * - $this->plugin - To the $request->params['plugin']
     * - $this->autoRender - To false if $request->params['return'] == 1
     * - $this->passedArgs - The combined results of params['named'] and params['pass]
     * - View::$passedArgs - $this->passedArgs
     * - View::$plugin - $this->plugin
     * - View::$view - To the $request->params['action']
     * - View::$autoLayout - To the false if $request->params['bare']; is set.
     *
     * @param \Cake\Network\Request $request Request instance.
     * @return void
     */
    public function setRequest(Request $request)
    {
        $this->request = $request;
        $this->plugin = isset($request->params['plugin']) ? $request->params['plugin'] : null;
        $this->view = isset($request->params['action']) ? $request->params['action'] : null;

        if (isset($request->params['pass'])) {
            $this->passedArgs = $request->params['pass'];
        }
    }

    /**
     * Dispatches the controller action. Checks that the action
     * exists and isn't private.
     *
     * @return mixed The resulting response.
     * @throws \LogicException When request is not set.
     * @throws \Cake\Controller\Exception\MissingActionException When actions are not defined or inaccessible.
     */
    public function invokeAction()
    {
        $request = $this->request;
        if (!isset($request)) {
            throw new LogicException('No Request object configured. Cannot invoke action');
        }
        if (!$this->isAction($request->params['action'])) {
            throw new MissingActionException([
                'controller' => $this->name . "Controller",
                'action' => $request->params['action'],
                'prefix' => isset($request->params['prefix']) ? $request->params['prefix'] : '',
                'plugin' => $request->params['plugin'],
            ]);
        }
        $callable = [$this, $request->params['action']];
        return call_user_func_array($callable, $request->params['pass']);
    }

    /**
     * Merge components, helpers vars from
     * parent classes.
     *
     * @return void
     */
    protected function _mergeControllerVars()
    {
        $this->_mergeVars(
            ['components', 'helpers'],
            ['associative' => ['components', 'helpers']]
        );
    }

    /**
     * Returns a list of all events that will fire in the controller during its lifecycle.
     * You can override this function to add you own listener callbacks
     *
     * @return array
     */
    public function implementedEvents()
    {
        return [
            'Controller.initialize' => 'beforeFilter',
            'Controller.beforeRender' => 'beforeRender',
            'Controller.beforeRedirect' => 'beforeRedirect',
            'Controller.shutdown' => 'afterFilter',
        ];
    }

    /**
     * Loads the defined components using the Component factory.
     *
     * @return void
     */
    protected function _loadComponents()
    {
        if (empty($this->components)) {
            return;
        }
        $registry = $this->components();
        $components = $registry->normalizeArray($this->components);
        foreach ($components as $properties) {
            $this->loadComponent($properties['class'], $properties['config']);
        }
    }

    /**
     * Perform the startup process for this controller.
     * Fire the Components and Controller callbacks in the correct order.
     *
     * - Initializes components, which fires their `initialize` callback
     * - Calls the controller `beforeFilter`.
     * - triggers Component `startup` methods.
     *
     * @return void|\Cake\Network\Response
     */
    public function startupProcess()
    {
        $event = $this->dispatchEvent('Controller.initialize');
        if ($event->result instanceof Response) {
            return $event->result;
        }
        $event = $this->dispatchEvent('Controller.startup');
        if ($event->result instanceof Response) {
            return $event->result;
        }
    }

    /**
     * Perform the various shutdown processes for this controller.
     * Fire the Components and Controller callbacks in the correct order.
     *
     * - triggers the component `shutdown` callback.
     * - calls the Controller's `afterFilter` method.
     *
     * @return void|\Cake\Network\Response
     */
    public function shutdownProcess()
    {
        $event = $this->dispatchEvent('Controller.shutdown');
        if ($event->result instanceof Response) {
            return $event->result;
        }
    }

    /**
     * Redirects to given $url, after turning off $this->autoRender.
     * Script execution is halted after the redirect.
     *
     * @param string|array $url A string or array-based URL pointing to another location within the app,
     *     or an absolute URL
     * @param int $status Optional HTTP status code (eg: 404)
     * @return void|\Cake\Network\Response
     * @link http://book.cakephp.org/3.0/en/controllers.html#Controller::redirect
     */
    public function redirect($url, $status = 302)
    {
        $this->autoRender = false;

        $response = $this->response;
        if ($status && $response->statusCode() === 200) {
            $response->statusCode($status);
        }

        $event = $this->dispatchEvent('Controller.beforeRedirect', [$url, $response]);
        if ($event->result instanceof Response) {
            return $event->result;
        }
        if ($event->isStopped()) {
            return;
        }

        if ($url !== null && !$response->location()) {
            $response->location(Router::url($url, true));
        }

        return $response;
    }

    /**
     * Internally redirects one action to another. Does not perform another HTTP request unlike Controller::redirect()
     *
     * Examples:
     *
     * ```
     * setAction('another_action');
     * setAction('action_with_parameters', $parameter1);
     * ```
     *
     * @param string $action The new action to be 'redirected' to.
     *   Any other parameters passed to this method will be passed as parameters to the new action.
     * @return mixed Returns the return value of the called action
     */
    public function setAction($action)
    {
        $this->request->params['action'] = $action;
        $this->view = $action;
        $args = func_get_args();
        unset($args[0]);
        return call_user_func_array([&$this, $action], $args);
    }

    /**
     * Instantiates the correct view class, hands it its data, and uses it to render the view output.
     *
     * @param string $view View to use for rendering
     * @param string $layout Layout to use
     * @return \Cake\Network\Response A response object containing the rendered view.
     * @link http://book.cakephp.org/3.0/en/controllers.html#rendering-a-view
     */
    public function render($view = null, $layout = null)
    {
        if (!empty($this->request->params['bare'])) {
            $this->getView()->autoLayout = false;
        }

        $event = $this->dispatchEvent('Controller.beforeRender');
        if ($event->result instanceof Response) {
            $this->autoRender = false;
            return $event->result;
        }
        if ($event->isStopped()) {
            $this->autoRender = false;
            return $this->response;
        }

        $this->autoRender = false;
        $this->response->body($this->getView()->render($view, $layout));
        return $this->response;
    }

    /**
     * Returns the referring URL for this request.
     *
     * @param string|null $default Default URL to use if HTTP_REFERER cannot be read from headers
     * @param bool $local If true, restrict referring URLs to local server
     * @return string Referring URL
     */
    public function referer($default = null, $local = false)
    {
        if (!$this->request) {
            return Router::url($default, !$local);
        }

        $referer = $this->request->referer($local);
        if ($referer === '/' && $default && $default !== $referer) {
            return Router::url($default, !$local);
        }
        return $referer;
    }

    /**
     * Handles pagination of records in Table objects.
     *
     * Will load the referenced Table object, and have the PaginatorComponent
     * paginate the query using the request date and settings defined in `$this->paginate`.
     *
     * This method will also make the PaginatorHelper available in the view.
     *
     * @param \Cake\ORM\Table|string|\Cake\ORM\Query|null $object Table to paginate
     * (e.g: Table instance, 'TableName' or a Query object)
     * @return \Cake\ORM\ResultSet Query results
     * @link http://book.cakephp.org/3.0/en/controllers.html#Controller::paginate
     * @throws \RuntimeException When no compatible table object can be found.
     */
    public function paginate($object = null)
    {
        if (is_object($object)) {
            $table = $object;
        }

        if (is_string($object) || $object === null) {
            $try = [$object, $this->modelClass];
            foreach ($try as $tableName) {
                if (empty($tableName)) {
                    continue;
                }
                $table = TableRegistry::get($tableName);
                break;
            }
        }

        $this->loadComponent('Paginator');
        if (empty($table)) {
            throw new \RuntimeException('Unable to locate an object compatible with paginate.');
        }
        return $this->Paginator->paginate($table, $this->paginate);
    }

    /**
     * Method to check that an action is accessible from a URL.
     *
     * Override this method to change which controller methods can be reached.
     * The default implementation disallows access to all methods defined on Cake\Controller\Controller,
     * and allows all public methods on all subclasses of this class.
     *
     * @param string $action The action to check.
     * @return bool Whether or not the method is accessible from a URL.
     */
    public function isAction($action)
    {
        try {
            $method = new ReflectionMethod($this, $action);
        } catch (\ReflectionException $e) {
            return false;
        }
        if (!$method->isPublic()) {
            return false;
        }
        if ($method->getDeclaringClass()->name === 'Cake\Controller\Controller') {
            return false;
        }
        return true;
    }

    /**
     * Called before the controller action. You can use this method to configure and customize components
     * or perform logic that needs to happen before each controller action.
     *
     * @param Event $event An Event instance
     * @return void
     * @link http://book.cakephp.org/3.0/en/controllers.html#request-life-cycle-callbacks
     */
    public function beforeFilter(Event $event)
    {
    }

    /**
     * Called after the controller action is run, but before the view is rendered. You can use this method
     * to perform logic or set view variables that are required on every request.
     *
     * @param Event $event An Event instance
     * @return void
     * @link http://book.cakephp.org/3.0/en/controllers.html#request-life-cycle-callbacks
     */
    public function beforeRender(Event $event)
    {
    }

    /**
     * The beforeRedirect method is invoked when the controller's redirect method is called but before any
     * further action.
     *
     * If the event is stopped the controller will not continue on to redirect the request.
     * The $url and $status variables have same meaning as for the controller's method.
     * You can set the event result to response instance or modify the redirect location
     * using controller's response instance.
     *
     * @param Event $event An Event instance
     * @param string|array $url A string or array-based URL pointing to another location within the app,
     *     or an absolute URL
     * @param \Cake\Network\Response $response The response object.
     * @return void
     * @link http://book.cakephp.org/3.0/en/controllers.html#request-life-cycle-callbacks
     */
    public function beforeRedirect(Event $event, $url, Response $response)
    {
    }

    /**
     * Called after the controller action is run and rendered.
     *
     * @param Event $event An Event instance
     * @return void
     * @link http://book.cakephp.org/3.0/en/controllers.html#request-life-cycle-callbacks
     */
    public function afterFilter(Event $event)
    {
    }
}