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<?php
declare(strict_types=1);
/**
* SPDX-FileCopyrightText: 2016-2024 Nextcloud GmbH and Nextcloud contributors
* SPDX-FileCopyrightText: 2016 ownCloud, Inc.
* SPDX-License-Identifier: AGPL-3.0-only
*/
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 Middleware[] array containing all the middlewares
*/
private array $middlewares;
/**
* @var int counter which tells us what middleware was executed once an
* exception occurs
*/
private int $middlewareCounter;
/**
* Constructor
*/
public function __construct() {
$this->middlewares = [];
$this->middlewareCounter = 0;
}
/**
* Adds a new middleware
* @param Middleware $middleWare the middleware which will be added
*/
public function registerMiddleware(Middleware $middleWare): void {
$this->middlewares[] = $middleWare;
}
/**
* returns an array with all middleware elements
* @return Middleware[] the middlewares
*/
public function getMiddlewares(): array {
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, string $methodName): void {
// 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 can't handle it
*/
public function afterException(Controller $controller, string $methodName, \Exception $exception): Response {
for ($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, string $methodName, Response $response): Response {
for ($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, string $methodName, string $output): string {
for ($i = \count($this->middlewares) - 1; $i >= 0; $i--) {
$middleware = $this->middlewares[$i];
$output = $middleware->beforeOutput($controller, $methodName, $output);
}
return $output;
}
}
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