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420 lines
15 KiB
PHP
420 lines
15 KiB
PHP
<?php
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/**
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* @link http://www.yiiframework.com/
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* @copyright Copyright (c) 2008 Yii Software LLC
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* @license http://www.yiiframework.com/license/
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*/
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namespace yii\base;
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use Yii;
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/**
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* Controller is the base class for classes containing controller logic.
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*
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* @property string $route The route (module ID, controller ID and action ID) of the current request. This
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* property is read-only.
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* @property string $uniqueId The controller ID that is prefixed with the module ID (if any). This property is
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* read-only.
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* @property View $view The view object that can be used to render views or view files.
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* @property string $viewPath The directory containing the view files for this controller. This property is
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* read-only.
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*
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* @author Qiang Xue <qiang.xue@gmail.com>
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* @since 2.0
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*/
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class Controller extends Component implements ViewContextInterface
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{
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/**
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* @event ActionEvent an event raised right before executing a controller action.
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* You may set [[ActionEvent::isValid]] to be false to cancel the action execution.
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*/
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const EVENT_BEFORE_ACTION = 'beforeAction';
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/**
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* @event ActionEvent an event raised right after executing a controller action.
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*/
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const EVENT_AFTER_ACTION = 'afterAction';
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/**
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* @var string the ID of this controller.
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*/
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public $id;
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/**
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* @var Module $module the module that this controller belongs to.
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*/
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public $module;
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/**
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* @var string the ID of the action that is used when the action ID is not specified
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* in the request. Defaults to 'index'.
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*/
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public $defaultAction = 'index';
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/**
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* @var string|boolean the name of the layout to be applied to this controller's views.
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* This property mainly affects the behavior of [[render()]].
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* Defaults to null, meaning the actual layout value should inherit that from [[module]]'s layout value.
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* If false, no layout will be applied.
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*/
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public $layout;
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/**
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* @var Action the action that is currently being executed. This property will be set
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* by [[run()]] when it is called by [[Application]] to run an action.
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*/
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public $action;
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/**
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* @var View the view object that can be used to render views or view files.
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*/
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private $_view;
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/**
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* @param string $id the ID of this controller.
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* @param Module $module the module that this controller belongs to.
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* @param array $config name-value pairs that will be used to initialize the object properties.
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*/
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public function __construct($id, $module, $config = [])
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{
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$this->id = $id;
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$this->module = $module;
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parent::__construct($config);
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}
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/**
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* Declares external actions for the controller.
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* This method is meant to be overwritten to declare external actions for the controller.
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* It should return an array, with array keys being action IDs, and array values the corresponding
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* action class names or action configuration arrays. For example,
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*
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* ~~~
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* return [
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* 'action1' => 'app\components\Action1',
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* 'action2' => [
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* 'class' => 'app\components\Action2',
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* 'property1' => 'value1',
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* 'property2' => 'value2',
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* ],
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* ];
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* ~~~
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*
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* [[\Yii::createObject()]] will be used later to create the requested action
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* using the configuration provided here.
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*/
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public function actions()
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{
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return [];
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}
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/**
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* Runs an action within this controller with the specified action ID and parameters.
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* If the action ID is empty, the method will use [[defaultAction]].
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* @param string $id the ID of the action to be executed.
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* @param array $params the parameters (name-value pairs) to be passed to the action.
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* @return mixed the result of the action.
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* @throws InvalidRouteException if the requested action ID cannot be resolved into an action successfully.
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* @see createAction()
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*/
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public function runAction($id, $params = [])
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{
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$action = $this->createAction($id);
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if ($action !== null) {
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Yii::trace("Route to run: " . $action->getUniqueId(), __METHOD__);
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if (Yii::$app->requestedAction === null) {
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Yii::$app->requestedAction = $action;
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}
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$oldAction = $this->action;
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$this->action = $action;
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$result = null;
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$event = new ActionEvent($action);
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Yii::$app->trigger(Application::EVENT_BEFORE_ACTION, $event);
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if ($event->isValid && $this->module->beforeAction($action) && $this->beforeAction($action)) {
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$result = $action->runWithParams($params);
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$result = $this->afterAction($action, $result);
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$result = $this->module->afterAction($action, $result);
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$event = new ActionEvent($action);
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$event->result = $result;
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Yii::$app->trigger(Application::EVENT_AFTER_ACTION, $event);
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$result = $event->result;
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}
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$this->action = $oldAction;
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return $result;
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} else {
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throw new InvalidRouteException('Unable to resolve the request: ' . $this->getUniqueId() . '/' . $id);
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}
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}
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/**
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* Runs a request specified in terms of a route.
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* The route can be either an ID of an action within this controller or a complete route consisting
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* of module IDs, controller ID and action ID. If the route starts with a slash '/', the parsing of
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* the route will start from the application; otherwise, it will start from the parent module of this controller.
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* @param string $route the route to be handled, e.g., 'view', 'comment/view', '/admin/comment/view'.
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* @param array $params the parameters to be passed to the action.
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* @return mixed the result of the action.
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* @see runAction()
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*/
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public function run($route, $params = [])
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{
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$pos = strpos($route, '/');
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if ($pos === false) {
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return $this->runAction($route, $params);
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} elseif ($pos > 0) {
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return $this->module->runAction($route, $params);
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} else {
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return Yii::$app->runAction(ltrim($route, '/'), $params);
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}
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}
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/**
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* Binds the parameters to the action.
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* This method is invoked by [[Action]] when it begins to run with the given parameters.
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* @param Action $action the action to be bound with parameters.
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* @param array $params the parameters to be bound to the action.
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* @return array the valid parameters that the action can run with.
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*/
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public function bindActionParams($action, $params)
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{
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return [];
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}
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/**
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* Creates an action based on the given action ID.
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* The method first checks if the action ID has been declared in [[actions()]]. If so,
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* it will use the configuration declared there to create the action object.
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* If not, it will look for a controller method whose name is in the format of `actionXyz`
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* where `Xyz` stands for the action ID. If found, an [[InlineAction]] representing that
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* method will be created and returned.
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* @param string $id the action ID.
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* @return Action the newly created action instance. Null if the ID doesn't resolve into any action.
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*/
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public function createAction($id)
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{
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if ($id === '') {
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$id = $this->defaultAction;
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}
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$actionMap = $this->actions();
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if (isset($actionMap[$id])) {
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return Yii::createObject($actionMap[$id], $id, $this);
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} elseif (preg_match('/^[a-z0-9\\-_]+$/', $id) && strpos($id, '--') === false && trim($id, '-') === $id) {
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$methodName = 'action' . str_replace(' ', '', ucwords(implode(' ', explode('-', $id))));
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if (method_exists($this, $methodName)) {
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$method = new \ReflectionMethod($this, $methodName);
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if ($method->getName() === $methodName) {
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return new InlineAction($id, $this, $methodName);
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}
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}
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}
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return null;
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}
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/**
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* This method is invoked right before an action is to be executed (after all possible filters).
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* You may override this method to do last-minute preparation for the action.
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* If you override this method, please make sure you call the parent implementation first.
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* @param Action $action the action to be executed.
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* @return boolean whether the action should continue to be executed.
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*/
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public function beforeAction($action)
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{
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$event = new ActionEvent($action);
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$this->trigger(self::EVENT_BEFORE_ACTION, $event);
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return $event->isValid;
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}
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/**
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* This method is invoked right after an action is executed.
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* You may override this method to do some postprocessing for the action.
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* If you override this method, please make sure you call the parent implementation first.
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* Also make sure you return the action result, whether it is processed or not.
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* @param Action $action the action just executed.
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* @param mixed $result the action return result.
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* @return mixed the processed action result.
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*/
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public function afterAction($action, $result)
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{
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$event = new ActionEvent($action);
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$event->result = $result;
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$this->trigger(self::EVENT_AFTER_ACTION, $event);
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return $event->result;
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}
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/**
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* @return string the controller ID that is prefixed with the module ID (if any).
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*/
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public function getUniqueId()
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{
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return $this->module instanceof Application ? $this->id : $this->module->getUniqueId() . '/' . $this->id;
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}
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/**
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* Returns the route of the current request.
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* @return string the route (module ID, controller ID and action ID) of the current request.
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*/
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public function getRoute()
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{
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return $this->action !== null ? $this->action->getUniqueId() : $this->getUniqueId();
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}
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/**
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* Renders a view and applies layout if available.
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*
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* The view to be rendered can be specified in one of the following formats:
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*
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* - path alias (e.g. "@app/views/site/index");
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* - absolute path within application (e.g. "//site/index"): the view name starts with double slashes.
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* The actual view file will be looked for under the [[Application::viewPath|view path]] of the application.
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* - absolute path within module (e.g. "/site/index"): the view name starts with a single slash.
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* The actual view file will be looked for under the [[Module::viewPath|view path]] of [[module]].
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* - relative path (e.g. "index"): the actual view file will be looked for under [[viewPath]].
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*
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* To determine which layout should be applied, the following two steps are conducted:
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*
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* 1. In the first step, it determines the layout name and the context module:
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*
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* - If [[layout]] is specified as a string, use it as the layout name and [[module]] as the context module;
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* - If [[layout]] is null, search through all ancestor modules of this controller and find the first
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* module whose [[Module::layout|layout]] is not null. The layout and the corresponding module
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* are used as the layout name and the context module, respectively. If such a module is not found
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* or the corresponding layout is not a string, it will return false, meaning no applicable layout.
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*
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* 2. In the second step, it determines the actual layout file according to the previously found layout name
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* and context module. The layout name can be:
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*
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* - a path alias (e.g. "@app/views/layouts/main");
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* - an absolute path (e.g. "/main"): the layout name starts with a slash. The actual layout file will be
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* looked for under the [[Application::layoutPath|layout path]] of the application;
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* - a relative path (e.g. "main"): the actual layout layout file will be looked for under the
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* [[Module::layoutPath|layout path]] of the context module.
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*
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* If the layout name does not contain a file extension, it will use the default one `.php`.
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*
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* @param string $view the view name. Please refer to [[findViewFile()]] on how to specify a view name.
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* @param array $params the parameters (name-value pairs) that should be made available in the view.
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* These parameters will not be available in the layout.
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* @return string the rendering result.
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* @throws InvalidParamException if the view file or the layout file does not exist.
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*/
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public function render($view, $params = [])
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{
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$output = $this->getView()->render($view, $params, $this);
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$layoutFile = $this->findLayoutFile($this->getView());
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if ($layoutFile !== false) {
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return $this->getView()->renderFile($layoutFile, ['content' => $output], $this);
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} else {
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return $output;
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}
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}
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/**
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* Renders a view.
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* This method differs from [[render()]] in that it does not apply any layout.
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* @param string $view the view name. Please refer to [[render()]] on how to specify a view name.
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* @param array $params the parameters (name-value pairs) that should be made available in the view.
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* @return string the rendering result.
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* @throws InvalidParamException if the view file does not exist.
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*/
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public function renderPartial($view, $params = [])
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{
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return $this->getView()->render($view, $params, $this);
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}
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/**
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* Renders a view file.
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* @param string $file the view file to be rendered. This can be either a file path or a path alias.
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* @param array $params the parameters (name-value pairs) that should be made available in the view.
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* @return string the rendering result.
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* @throws InvalidParamException if the view file does not exist.
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*/
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public function renderFile($file, $params = [])
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{
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return $this->getView()->renderFile($file, $params, $this);
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}
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/**
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* Returns the view object that can be used to render views or view files.
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* The [[render()]], [[renderPartial()]] and [[renderFile()]] methods will use
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* this view object to implement the actual view rendering.
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* If not set, it will default to the "view" application component.
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* @return View the view object that can be used to render views or view files.
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*/
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public function getView()
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{
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if ($this->_view === null) {
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$this->_view = Yii::$app->getView();
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}
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return $this->_view;
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}
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/**
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* Sets the view object to be used by this controller.
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* @param View $view the view object that can be used to render views or view files.
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*/
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public function setView($view)
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{
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$this->_view = $view;
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}
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/**
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* Returns the directory containing view files for this controller.
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* The default implementation returns the directory named as controller [[id]] under the [[module]]'s
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* [[viewPath]] directory.
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* @return string the directory containing the view files for this controller.
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*/
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public function getViewPath()
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{
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return $this->module->getViewPath() . DIRECTORY_SEPARATOR . $this->id;
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}
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/**
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* Finds the view file based on the given view name.
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* @param string $view the view name or the path alias of the view file. Please refer to [[render()]]
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* on how to specify this parameter.
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* @return string the view file path. Note that the file may not exist.
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*/
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public function findViewFile($view)
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{
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return $this->getViewPath() . DIRECTORY_SEPARATOR . $view;
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}
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/**
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* Finds the applicable layout file.
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* @param View $view the view object to render the layout file.
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* @return string|boolean the layout file path, or false if layout is not needed.
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* Please refer to [[render()]] on how to specify this parameter.
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* @throws InvalidParamException if an invalid path alias is used to specify the layout.
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*/
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protected function findLayoutFile($view)
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{
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$module = $this->module;
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if (is_string($this->layout)) {
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$layout = $this->layout;
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} elseif ($this->layout === null) {
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while ($module !== null && $module->layout === null) {
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$module = $module->module;
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}
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if ($module !== null && is_string($module->layout)) {
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$layout = $module->layout;
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}
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}
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if (!isset($layout)) {
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return false;
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}
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if (strncmp($layout, '@', 1) === 0) {
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$file = Yii::getAlias($layout);
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} elseif (strncmp($layout, '/', 1) === 0) {
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$file = Yii::$app->getLayoutPath() . DIRECTORY_SEPARATOR . substr($layout, 1);
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} else {
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$file = $module->getLayoutPath() . DIRECTORY_SEPARATOR . $layout;
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}
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if (pathinfo($file, PATHINFO_EXTENSION) !== '') {
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return $file;
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}
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$path = $file . '.' . $view->defaultExtension;
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if ($view->defaultExtension !== 'php' && !is_file($path)) {
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$path = $file . '.php';
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}
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return $path;
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}
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}
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