Controller.php 17.7 KB
Newer Older
Qiang Xue committed
1 2 3
<?php
/**
 * @link http://www.yiiframework.com/
Qiang Xue committed
4
 * @copyright Copyright (c) 2008 Yii Software LLC
Qiang Xue committed
5 6 7 8 9
 * @license http://www.yiiframework.com/license/
 */

namespace yii\base;

Qiang Xue committed
10 11
use Yii;

Qiang Xue committed
12
/**
Qiang Xue committed
13
 * Controller is the base class for classes containing controller logic.
Qiang Xue committed
14
 *
Carsten Brandt committed
15 16
 * @property Module[] $modules All ancestor modules that this controller is located within. This property is
 * read-only.
17 18 19 20
 * @property string $route The route (module ID, controller ID and action ID) of the current request. This
 * property is read-only.
 * @property string $uniqueId The controller ID that is prefixed with the module ID (if any). This property is
 * read-only.
Carsten Brandt committed
21
 * @property View|\yii\web\View $view The view object that can be used to render views or view files.
22 23
 * @property string $viewPath The directory containing the view files for this controller. This property is
 * read-only.
24
 *
Qiang Xue committed
25 26 27
 * @author Qiang Xue <qiang.xue@gmail.com>
 * @since 2.0
 */
28
class Controller extends Component implements ViewContextInterface
Qiang Xue committed
29
{
30 31 32 33 34 35 36 37 38
    /**
     * @event ActionEvent an event raised right before executing a controller action.
     * You may set [[ActionEvent::isValid]] to be false to cancel the action execution.
     */
    const EVENT_BEFORE_ACTION = 'beforeAction';
    /**
     * @event ActionEvent an event raised right after executing a controller action.
     */
    const EVENT_AFTER_ACTION = 'afterAction';
39

40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64
    /**
     * @var string the ID of this controller.
     */
    public $id;
    /**
     * @var Module $module the module that this controller belongs to.
     */
    public $module;
    /**
     * @var string the ID of the action that is used when the action ID is not specified
     * in the request. Defaults to 'index'.
     */
    public $defaultAction = 'index';
    /**
     * @var string|boolean the name of the layout to be applied to this controller's views.
     * This property mainly affects the behavior of [[render()]].
     * Defaults to null, meaning the actual layout value should inherit that from [[module]]'s layout value.
     * If false, no layout will be applied.
     */
    public $layout;
    /**
     * @var Action the action that is currently being executed. This property will be set
     * by [[run()]] when it is called by [[Application]] to run an action.
     */
    public $action;
65

66 67 68 69
    /**
     * @var View the view object that can be used to render views or view files.
     */
    private $_view;
Qiang Xue committed
70

71

72
    /**
73
     * @param string $id the ID of this controller.
74
     * @param Module $module the module that this controller belongs to.
75
     * @param array $config name-value pairs that will be used to initialize the object properties.
76 77 78 79 80 81 82
     */
    public function __construct($id, $module, $config = [])
    {
        $this->id = $id;
        $this->module = $module;
        parent::__construct($config);
    }
Qiang Xue committed
83

84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107
    /**
     * Declares external actions for the controller.
     * This method is meant to be overwritten to declare external actions for the controller.
     * It should return an array, with array keys being action IDs, and array values the corresponding
     * action class names or action configuration arrays. For example,
     *
     * ~~~
     * return [
     *     'action1' => 'app\components\Action1',
     *     'action2' => [
     *         'class' => 'app\components\Action2',
     *         'property1' => 'value1',
     *         'property2' => 'value2',
     *     ],
     * ];
     * ~~~
     *
     * [[\Yii::createObject()]] will be used later to create the requested action
     * using the configuration provided here.
     */
    public function actions()
    {
        return [];
    }
Qiang Xue committed
108

109 110 111
    /**
     * Runs an action within this controller with the specified action ID and parameters.
     * If the action ID is empty, the method will use [[defaultAction]].
112 113 114
     * @param string $id the ID of the action to be executed.
     * @param array $params the parameters (name-value pairs) to be passed to the action.
     * @return mixed the result of the action.
115 116 117 118 119 120
     * @throws InvalidRouteException if the requested action ID cannot be resolved into an action successfully.
     * @see createAction()
     */
    public function runAction($id, $params = [])
    {
        $action = $this->createAction($id);
121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142
        if ($action === null) {
            throw new InvalidRouteException('Unable to resolve the request: ' . $this->getUniqueId() . '/' . $id);
        }

        Yii::trace("Route to run: " . $action->getUniqueId(), __METHOD__);

        if (Yii::$app->requestedAction === null) {
            Yii::$app->requestedAction = $action;
        }

        $oldAction = $this->action;
        $this->action = $action;

        $modules = [];
        $runAction = true;

        foreach ($this->getModules() as $module) {
            if ($module->beforeAction($action)) {
                array_unshift($modules, $module);
            } else {
                $runAction = false;
                break;
143
            }
144 145 146 147 148 149
        }

        $result = null;

        if ($runAction) {
            if ($this->beforeAction($action)) {
150 151 152
                $result = $action->runWithParams($params);
                $result = $this->afterAction($action, $result);
            }
153
        }
Qiang Xue committed
154

155
        foreach ($modules as $module) {
156
            /* @var $module Module */
157
            $result = $module->afterAction($action, $result);
158
        }
159 160 161 162

        $this->action = $oldAction;

        return $result;
163
    }
Qiang Xue committed
164

165 166 167 168 169
    /**
     * Runs a request specified in terms of a route.
     * The route can be either an ID of an action within this controller or a complete route consisting
     * of module IDs, controller ID and action ID. If the route starts with a slash '/', the parsing of
     * the route will start from the application; otherwise, it will start from the parent module of this controller.
170 171 172
     * @param string $route the route to be handled, e.g., 'view', 'comment/view', '/admin/comment/view'.
     * @param array $params the parameters to be passed to the action.
     * @return mixed the result of the action.
173 174 175 176 177 178 179 180 181 182 183 184 185
     * @see runAction()
     */
    public function run($route, $params = [])
    {
        $pos = strpos($route, '/');
        if ($pos === false) {
            return $this->runAction($route, $params);
        } elseif ($pos > 0) {
            return $this->module->runAction($route, $params);
        } else {
            return Yii::$app->runAction(ltrim($route, '/'), $params);
        }
    }
Qiang Xue committed
186

187 188 189
    /**
     * Binds the parameters to the action.
     * This method is invoked by [[Action]] when it begins to run with the given parameters.
190 191 192
     * @param Action $action the action to be bound with parameters.
     * @param array $params the parameters to be bound to the action.
     * @return array the valid parameters that the action can run with.
193 194 195 196 197
     */
    public function bindActionParams($action, $params)
    {
        return [];
    }
Qiang Xue committed
198

199 200 201 202 203 204 205
    /**
     * Creates an action based on the given action ID.
     * The method first checks if the action ID has been declared in [[actions()]]. If so,
     * it will use the configuration declared there to create the action object.
     * If not, it will look for a controller method whose name is in the format of `actionXyz`
     * where `Xyz` stands for the action ID. If found, an [[InlineAction]] representing that
     * method will be created and returned.
206
     * @param string $id the action ID.
207 208 209 210 211 212 213
     * @return Action the newly created action instance. Null if the ID doesn't resolve into any action.
     */
    public function createAction($id)
    {
        if ($id === '') {
            $id = $this->defaultAction;
        }
Qiang Xue committed
214

215 216
        $actionMap = $this->actions();
        if (isset($actionMap[$id])) {
Qiang Xue committed
217
            return Yii::createObject($actionMap[$id], [$id, $this]);
218 219 220 221
        } elseif (preg_match('/^[a-z0-9\\-_]+$/', $id) && strpos($id, '--') === false && trim($id, '-') === $id) {
            $methodName = 'action' . str_replace(' ', '', ucwords(implode(' ', explode('-', $id))));
            if (method_exists($this, $methodName)) {
                $method = new \ReflectionMethod($this, $methodName);
222
                if ($method->isPublic() && $method->getName() === $methodName) {
223 224 225 226
                    return new InlineAction($id, $this, $methodName);
                }
            }
        }
Qiang Xue committed
227

228 229
        return null;
    }
Qiang Xue committed
230

231
    /**
232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250
     * This method is invoked right before an action is executed.
     *
     * The method will trigger the [[EVENT_BEFORE_ACTION]] event. The return value of the method
     * will determine whether the action should continue to run.
     *
     * If you override this method, your code should look like the following:
     *
     * ```php
     * public function beforeAction($action)
     * {
     *     if (parent::beforeAction($action)) {
     *         // your custom code here
     *         return true;  // or false if needed
     *     } else {
     *         return false;
     *     }
     * }
     * ```
     *
251
     * @param Action $action the action to be executed.
252
     * @return boolean whether the action should continue to run.
253 254 255 256 257 258 259
     */
    public function beforeAction($action)
    {
        $event = new ActionEvent($action);
        $this->trigger(self::EVENT_BEFORE_ACTION, $event);
        return $event->isValid;
    }
Qiang Xue committed
260

261 262
    /**
     * This method is invoked right after an action is executed.
263 264 265 266 267 268 269 270 271 272 273 274 275 276 277
     *
     * The method will trigger the [[EVENT_AFTER_ACTION]] event. The return value of the method
     * will be used as the action return value.
     *
     * If you override this method, your code should look like the following:
     *
     * ```php
     * public function afterAction($action, $result)
     * {
     *     $result = parent::afterAction($action, $result);
     *     // your custom code here
     *     return $result;
     * }
     * ```
     *
278 279 280
     * @param Action $action the action just executed.
     * @param mixed $result the action return result.
     * @return mixed the processed action result.
281 282 283 284 285 286 287 288
     */
    public function afterAction($action, $result)
    {
        $event = new ActionEvent($action);
        $event->result = $result;
        $this->trigger(self::EVENT_AFTER_ACTION, $event);
        return $event->result;
    }
Qiang Xue committed
289

290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306
    /**
     * Returns all ancestor modules of this controller.
     * The first module in the array is the outermost one (i.e., the application instance),
     * while the last is the innermost one.
     * @return Module[] all ancestor modules that this controller is located within.
     */
    public function getModules()
    {
        $modules = [$this->module];
        $module = $this->module;
        while ($module->module !== null) {
            array_unshift($modules, $module->module);
            $module = $module->module;
        }
        return $modules;
    }

307 308 309 310 311 312 313
    /**
     * @return string the controller ID that is prefixed with the module ID (if any).
     */
    public function getUniqueId()
    {
        return $this->module instanceof Application ? $this->id : $this->module->getUniqueId() . '/' . $this->id;
    }
Qiang Xue committed
314

315 316 317 318 319 320 321 322
    /**
     * Returns the route of the current request.
     * @return string the route (module ID, controller ID and action ID) of the current request.
     */
    public function getRoute()
    {
        return $this->action !== null ? $this->action->getUniqueId() : $this->getUniqueId();
    }
Qiang Xue committed
323

324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351
    /**
     * Renders a view and applies layout if available.
     *
     * The view to be rendered can be specified in one of the following formats:
     *
     * - path alias (e.g. "@app/views/site/index");
     * - absolute path within application (e.g. "//site/index"): the view name starts with double slashes.
     *   The actual view file will be looked for under the [[Application::viewPath|view path]] of the application.
     * - absolute path within module (e.g. "/site/index"): the view name starts with a single slash.
     *   The actual view file will be looked for under the [[Module::viewPath|view path]] of [[module]].
     * - relative path (e.g. "index"): the actual view file will be looked for under [[viewPath]].
     *
     * To determine which layout should be applied, the following two steps are conducted:
     *
     * 1. In the first step, it determines the layout name and the context module:
     *
     * - If [[layout]] is specified as a string, use it as the layout name and [[module]] as the context module;
     * - If [[layout]] is null, search through all ancestor modules of this controller and find the first
     *   module whose [[Module::layout|layout]] is not null. The layout and the corresponding module
     *   are used as the layout name and the context module, respectively. If such a module is not found
     *   or the corresponding layout is not a string, it will return false, meaning no applicable layout.
     *
     * 2. In the second step, it determines the actual layout file according to the previously found layout name
     *    and context module. The layout name can be:
     *
     * - a path alias (e.g. "@app/views/layouts/main");
     * - an absolute path (e.g. "/main"): the layout name starts with a slash. The actual layout file will be
     *   looked for under the [[Application::layoutPath|layout path]] of the application;
352
     * - a relative path (e.g. "main"): the actual layout file will be looked for under the
353 354 355 356
     *   [[Module::layoutPath|layout path]] of the context module.
     *
     * If the layout name does not contain a file extension, it will use the default one `.php`.
     *
357
     * @param string $view the view name.
358 359 360
     * @param array $params the parameters (name-value pairs) that should be made available in the view.
     * These parameters will not be available in the layout.
     * @return string the rendering result.
361 362 363 364 365 366 367 368 369 370 371 372
     * @throws InvalidParamException if the view file or the layout file does not exist.
     */
    public function render($view, $params = [])
    {
        $output = $this->getView()->render($view, $params, $this);
        $layoutFile = $this->findLayoutFile($this->getView());
        if ($layoutFile !== false) {
            return $this->getView()->renderFile($layoutFile, ['content' => $output], $this);
        } else {
            return $output;
        }
    }
Qiang Xue committed
373

374 375 376
    /**
     * Renders a view.
     * This method differs from [[render()]] in that it does not apply any layout.
377 378 379
     * @param string $view the view name. Please refer to [[render()]] on how to specify a view name.
     * @param array $params the parameters (name-value pairs) that should be made available in the view.
     * @return string the rendering result.
380 381 382 383 384 385
     * @throws InvalidParamException if the view file does not exist.
     */
    public function renderPartial($view, $params = [])
    {
        return $this->getView()->render($view, $params, $this);
    }
Qiang Xue committed
386

387 388
    /**
     * Renders a view file.
389 390 391
     * @param string $file the view file to be rendered. This can be either a file path or a path alias.
     * @param array $params the parameters (name-value pairs) that should be made available in the view.
     * @return string the rendering result.
392 393 394 395 396 397
     * @throws InvalidParamException if the view file does not exist.
     */
    public function renderFile($file, $params = [])
    {
        return $this->getView()->renderFile($file, $params, $this);
    }
Qiang Xue committed
398

399 400 401 402 403
    /**
     * Returns the view object that can be used to render views or view files.
     * The [[render()]], [[renderPartial()]] and [[renderFile()]] methods will use
     * this view object to implement the actual view rendering.
     * If not set, it will default to the "view" application component.
404
     * @return View|\yii\web\View the view object that can be used to render views or view files.
405 406 407 408 409 410 411 412
     */
    public function getView()
    {
        if ($this->_view === null) {
            $this->_view = Yii::$app->getView();
        }
        return $this->_view;
    }
Qiang Xue committed
413

414 415
    /**
     * Sets the view object to be used by this controller.
Carsten Brandt committed
416
     * @param View|\yii\web\View $view the view object that can be used to render views or view files.
417 418 419 420 421
     */
    public function setView($view)
    {
        $this->_view = $view;
    }
Qiang Xue committed
422

423 424 425 426 427 428 429 430 431 432
    /**
     * Returns the directory containing view files for this controller.
     * The default implementation returns the directory named as controller [[id]] under the [[module]]'s
     * [[viewPath]] directory.
     * @return string the directory containing the view files for this controller.
     */
    public function getViewPath()
    {
        return $this->module->getViewPath() . DIRECTORY_SEPARATOR . $this->id;
    }
Qiang Xue committed
433

434 435
    /**
     * Finds the applicable layout file.
436 437 438
     * @param View $view the view object to render the layout file.
     * @return string|boolean the layout file path, or false if layout is not needed.
     * Please refer to [[render()]] on how to specify this parameter.
439 440
     * @throws InvalidParamException if an invalid path alias is used to specify the layout.
     */
441
    public function findLayoutFile($view)
442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476
    {
        $module = $this->module;
        if (is_string($this->layout)) {
            $layout = $this->layout;
        } elseif ($this->layout === null) {
            while ($module !== null && $module->layout === null) {
                $module = $module->module;
            }
            if ($module !== null && is_string($module->layout)) {
                $layout = $module->layout;
            }
        }

        if (!isset($layout)) {
            return false;
        }

        if (strncmp($layout, '@', 1) === 0) {
            $file = Yii::getAlias($layout);
        } elseif (strncmp($layout, '/', 1) === 0) {
            $file = Yii::$app->getLayoutPath() . DIRECTORY_SEPARATOR . substr($layout, 1);
        } else {
            $file = $module->getLayoutPath() . DIRECTORY_SEPARATOR . $layout;
        }

        if (pathinfo($file, PATHINFO_EXTENSION) !== '') {
            return $file;
        }
        $path = $file . '.' . $view->defaultExtension;
        if ($view->defaultExtension !== 'php' && !is_file($path)) {
            $path = $file . '.php';
        }

        return $path;
    }
Qiang Xue committed
477
}