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<?php
/**
* @author Jörn Friedrich Dreyer <jfd@butonic.de>
* @author Lukas Reschke <lukas@owncloud.com>
* @author Morris Jobke <hey@morrisjobke.de>
* @author Thomas Müller <thomas.mueller@tmit.eu>
* @author Thomas Tanghus <thomas@tanghus.net>
*
* @copyright Copyright (c) 2016, ownCloud, Inc.
* @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/>
*
*/
namespace OC\AppFramework\Middleware;
use OCP\AppFramework\Controller;
use OCP\AppFramework\Http\Response;
use OCP\AppFramework\MiddleWare;
/**
* This class is used to store and run all the middleware in correct order
*/
class MiddlewareDispatcher {
/**
* @var array array containing all the middlewares
*/
private $middlewares;
/**
* @var int counter which tells us what middlware was executed once an
* exception occurs
*/
private $middlewareCounter;
/**
* Constructor
*/
public function __construct(){
$this->middlewares = array();
$this->middlewareCounter = 0;
}
/**
* Adds a new middleware
* @param Middleware $middleWare the middleware which will be added
*/
public function registerMiddleware(Middleware $middleWare){
array_push($this->middlewares, $middleWare);
}
/**
* returns an array with all middleware elements
* @return array the middlewares
*/
public function getMiddlewares(){
return $this->middlewares;
}
/**
* 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
*/
public function beforeController(Controller $controller, $methodName){
// we need to count so that we know which middlewares we have to ask in
// case there is an exception
$middlewareCount = count($this->middlewares);
for($i = 0; $i < $middlewareCount; $i++){
$this->middlewareCounter++;
$middleware = $this->middlewares[$i];
$middleware->beforeController($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
* @return Response a Response object if the middleware can handle the
* exception
* @throws \Exception the passed in exception if it cant handle it
*/
public function afterException(Controller $controller, $methodName, \Exception $exception){
for($i=$this->middlewareCounter-1; $i>=0; $i--){
$middleware = $this->middlewares[$i];
try {
return $middleware->afterException($controller, $methodName, $exception);
} catch(\Exception $exception){
continue;
}
}
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
*/
public function afterController(Controller $controller, $methodName, Response $response){
for($i=count($this->middlewares)-1; $i>=0; $i--){
$middleware = $this->middlewares[$i];
$response = $middleware->afterController($controller, $methodName, $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
*/
public function beforeOutput(Controller $controller, $methodName, $output){
for($i=count($this->middlewares)-1; $i>=0; $i--){
$middleware = $this->middlewares[$i];
$output = $middleware->beforeOutput($controller, $methodName, $output);
}
return $output;
}
}
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