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<?php
/**
* @copyright Copyright (c) 2016, ownCloud, Inc.
*
* @author Morris Jobke <hey@morrisjobke.de>
* @author Stefan Weil <sw@weilnetz.de>
* @author Thomas Müller <thomas.mueller@tmit.eu>
* @author Thomas Tanghus <thomas@tanghus.net>
*
* @license AGPL-3.0
*
* This code is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License, version 3,
* along with this program. If not, see <http://www.gnu.org/licenses/>
*
*/
/**
* Public interface of ownCloud for apps to use.
* AppFramework\Middleware class
*/
namespace OCP\AppFramework;
use OCP\AppFramework\Controller;
use OCP\AppFramework\Http\Response;
/**
* Middleware is used to provide hooks before or after controller methods and
* deal with possible exceptions raised in the controller methods.
* They're modeled after Django's middleware system:
* https://docs.djangoproject.com/en/dev/topics/http/middleware/
* @since 6.0.0
*/
abstract class Middleware {
/**
* This is being run in normal order before the controller is being
* called which allows several modifications and checks
*
* @param Controller $controller the controller that is being called
* @param string $methodName the name of the method that will be called on
* the controller
* @since 6.0.0
*/
public function beforeController($controller, $methodName){
}
/**
* This is being run when either the beforeController method or the
* controller method itself is throwing an exception. The middleware is
* asked in reverse order to handle the exception and to return a response.
* If the response is null, it is assumed that the exception could not be
* handled and the error will be thrown again
*
* @param Controller $controller the controller that is being called
* @param string $methodName the name of the method that will be called on
* the controller
* @param \Exception $exception the thrown exception
* @throws \Exception the passed in exception if it can't handle it
* @return Response a Response object in case that the exception was handled
* @since 6.0.0
*/
public function afterException($controller, $methodName, \Exception $exception){
throw $exception;
}
/**
* This is being run after a successful controllermethod call and allows
* the manipulation of a Response object. The middleware is run in reverse order
*
* @param Controller $controller the controller that is being called
* @param string $methodName the name of the method that will be called on
* the controller
* @param Response $response the generated response from the controller
* @return Response a Response object
* @since 6.0.0
*/
public function afterController($controller, $methodName, Response $response){
return $response;
}
/**
* This is being run after the response object has been rendered and
* allows the manipulation of the output. The middleware is run in reverse order
*
* @param Controller $controller the controller that is being called
* @param string $methodName the name of the method that will be called on
* the controller
* @param string $output the generated output from a response
* @return string the output that should be printed
* @since 6.0.0
*/
public function beforeOutput($controller, $methodName, $output){
return $output;
}
}
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