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<?php

/**

 * Exception Renderer

 *

 * Provides Exception rendering features. Which allow exceptions to be rendered

 * as HTML pages.

 *

 * 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.Error

 * @since         CakePHP(tm) v 2.0

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

 */

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

App::uses('Router', 'Routing');

App::uses('CakeResponse', 'Network');

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

/**

 * Exception Renderer.

 *

 * Captures and handles all unhandled exceptions. Displays helpful framework errors when debug > 1.

 * When debug < 1 a CakeException will render 404 or 500 errors. If an uncaught exception is thrown

 * and it is a type that ExceptionHandler does not know about it will be treated as a 500 error.

 *

 * ### Implementing application specific exception rendering

 *

 * You can implement application specific exception handling in one of a few ways:

 *

 * - Create an AppController::appError();

 * - Create a subclass of ExceptionRenderer and configure it to be the `Exception.renderer`

 *

 * #### Using AppController::appError();

 *

 * This controller method is called instead of the default exception handling. It receives the

 * thrown exception as its only argument. You should implement your error handling in that method.

 *

 * #### Using a subclass of ExceptionRenderer

 *

 * Using a subclass of ExceptionRenderer gives you full control over how Exceptions are rendered, you

 * can configure your class in your core.php, with `Configure::write('Exception.renderer', 'MyClass');`

 * You should place any custom exception renderers in `app/Lib/Error`.

 *

 * @package       Cake.Error

 */

class ExceptionRenderer {

/**

 * Controller instance.

 *

 * @var Controller

 */

	public $controller = null;

/**

 * template to render for CakeException

 *

 * @var string

 */

	public $template = '';

/**

 * The method corresponding to the Exception this object is for.

 *

 * @var string

 */

	public $method = '';

/**

 * The exception being handled.

 *

 * @var Exception

 */

	public $error = null;

/**

 * Creates the controller to perform rendering on the error response.

 * If the error is a CakeException it will be converted to either a 400 or a 500

 * code error depending on the code used to construct the error.

 *

 * @param Exception $exception Exception

 */

	public function __construct(Exception $exception) {

		$this->controller = $this->_getController($exception);

		if (method_exists($this->controller, 'appError')) {

			$this->controller->appError($exception);

			return;

		}

		$method = $template = Inflector::variable(str_replace('Exception', '', get_class($exception)));

		$code = $exception->getCode();

		$methodExists = method_exists($this, $method);

		if ($exception instanceof CakeException && !$methodExists) {

			$method = '_cakeError';

			if (empty($template) || $template === 'internalError') {

				$template = 'error500';

			}

		} elseif ($exception instanceof PDOException) {

			$method = 'pdoError';

			$template = 'pdo_error';

			$code = 500;

		} elseif (!$methodExists) {

			$method = 'error500';

			if ($code >= 400 && $code < 500) {

				$method = 'error400';

			}

		}

		$isNotDebug = !Configure::read('debug');

		if ($isNotDebug && $method === '_cakeError') {

			$method = 'error400';

		}

		if ($isNotDebug && $code == 500) {

			$method = 'error500';

		}

		$this->template = $template;

		$this->method = $method;

		$this->error = $exception;

	}

/**

 * Get the controller instance to handle the exception.

 * Override this method in subclasses to customize the controller used.

 * This method returns the built in `CakeErrorController` normally, or if an error is repeated

 * a bare controller will be used.

 *

 * @param Exception $exception The exception to get a controller for.

 * @return Controller

 */

	protected function _getController($exception) {

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

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

		if (!$request = Router::getRequest(true)) {

			$request = new CakeRequest();

		}

		$response = new CakeResponse();

		if (method_exists($exception, 'responseHeader')) {

			$response->header($exception->responseHeader());

		}

		if (class_exists('AppController')) {

			try {

				$controller = new CakeErrorController($request, $response);

				$controller->startupProcess();

				$startup = true;

			} catch (Exception $e) {

				$startup = false;

			}

			// Retry RequestHandler, as another aspect of startupProcess()

			// could have failed. Ignore any exceptions out of startup, as

			// there could be userland input data parsers.

			if ($startup === false &&

				!empty($controller) &&

				$controller->Components->enabled('RequestHandler')

			) {

				try {

					$controller->RequestHandler->startup($controller);

				} catch (Exception $e) {

				}

			}

		}

		if (empty($controller)) {

			$controller = new Controller($request, $response);

			$controller->viewPath = 'Errors';

		}

		return $controller;

	}

/**

 * Renders the response for the exception.

 *

 * @return void

 */

	public function render() {

		if ($this->method) {

			call_user_func_array(array($this, $this->method), array($this->error));

		}

	}

/**

 * Generic handler for the internal framework errors CakePHP can generate.

 *

 * @param CakeException $error The exception to render.

 * @return void

 */

	protected function _cakeError(CakeException $error) {

		$url = $this->controller->request->here();

		$code = ($error->getCode() >= 400 && $error->getCode() < 506) ? $error->getCode() : 500;

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

		$this->controller->set(array(

			'code' => $code,

			'name' => h($error->getMessage()),

			'message' => h($error->getMessage()),

			'url' => h($url),

			'error' => $error,

			'_serialize' => array('code', 'name', 'message', 'url')

		));

		$this->controller->set($error->getAttributes());

		$this->_outputMessage($this->template);

	}

/**

 * Convenience method to display a 400 series page.

 *

 * @param Exception $error The exception to render.

 * @return void

 */

	public function error400($error) {

		$message = $error->getMessage();

		if (!Configure::read('debug') && $error instanceof CakeException) {

			$message = __d('cake', 'Not Found');

		}

		$url = $this->controller->request->here();

		$this->controller->response->statusCode($error->getCode());

		$this->controller->set(array(

			'name' => h($message),

			'message' => h($message),

			'url' => h($url),

			'error' => $error,

			'_serialize' => array('name', 'message', 'url')

		));

		$this->_outputMessage('error400');

	}

/**

 * Convenience method to display a 500 page.

 *

 * @param Exception $error The exception to render.

 * @return void

 */

	public function error500($error) {

		$message = $error->getMessage();

		if (!Configure::read('debug')) {

			$message = __d('cake', 'An Internal Error Has Occurred.');

		}

		$url = $this->controller->request->here();

		$code = ($error->getCode() > 500 && $error->getCode() < 506) ? $error->getCode() : 500;

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

		$this->controller->set(array(

			'name' => h($message),

			'message' => h($message),

			'url' => h($url),

			'error' => $error,

			'_serialize' => array('name', 'message', 'url')

		));

		$this->_outputMessage('error500');

	}

/**

 * Convenience method to display a PDOException.

 *

 * @param PDOException $error The exception to render.

 * @return void

 */

	public function pdoError(PDOException $error) {

		$url = $this->controller->request->here();

		$code = 500;

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

		$this->controller->set(array(

			'code' => $code,

			'name' => h($error->getMessage()),

			'message' => h($error->getMessage()),

			'url' => h($url),

			'error' => $error,

			'_serialize' => array('code', 'name', 'message', 'url', 'error')

		));

		$this->_outputMessage($this->template);

	}

/**

 * Generate the response using the controller object.

 *

 * @param string $template The template to render.

 * @return void

 */

	protected function _outputMessage($template) {

		try {

			$this->controller->render($template);

			$this->controller->afterFilter();

			$this->controller->response->send();

		} catch (MissingViewException $e) {

			$attributes = $e->getAttributes();

			if (isset($attributes['file']) && strpos($attributes['file'], 'error500') !== false) {

				$this->_outputMessageSafe('error500');

			} else {

				$this->_outputMessage('error500');

			}

		} catch (MissingPluginException $e) {

			$attributes = $e->getAttributes();

			if (isset($attributes['plugin']) && $attributes['plugin'] === $this->controller->plugin) {

				$this->controller->plugin = null;

			}

			$this->_outputMessageSafe('error500');

		} catch (Exception $e) {

			$this->_outputMessageSafe('error500');

		}

	}

/**

 * A safer way to render error messages, replaces all helpers, with basics

 * and doesn't call component methods.

 *

 * @param string $template The template to render

 * @return void

 */

	protected function _outputMessageSafe($template) {

		$this->controller->layoutPath = null;

		$this->controller->subDir = null;

		$this->controller->viewPath = 'Errors';

		$this->controller->layout = 'error';

		$this->controller->helpers = array('Form', 'Html', 'Session');

		$view = new View($this->controller);

		$this->controller->response->body($view->render($template, 'error'));

		$this->controller->response->type('html');

		$this->controller->response->send();

	}

}