nextcloud_server/tests/lib/AppFramework/Middleware/MiddlewareDispatcherTest.php

<?php

/**
 * SPDX-FileCopyrightText: 2016-2024 Nextcloud GmbH and Nextcloud contributors
 * SPDX-FileCopyrightText: 2016 ownCloud, Inc.
 * SPDX-License-Identifier: AGPL-3.0-or-later
 */

namespace Test\AppFramework\Middleware;

use OC\AppFramework\Http\Request;
use OC\AppFramework\Middleware\MiddlewareDispatcher;
use OCP\AppFramework\Http\Response;
use OCP\AppFramework\Middleware;
use OCP\IConfig;
use OCP\IRequestId;

// needed to test ordering
class TestMiddleware extends Middleware {
	public static $beforeControllerCalled = 0;
	public static $afterControllerCalled = 0;
	public static $afterExceptionCalled = 0;
	public static $beforeOutputCalled = 0;

	public $beforeControllerOrder = 0;
	public $afterControllerOrder = 0;
	public $afterExceptionOrder = 0;
	public $beforeOutputOrder = 0;

	public $controller;
	public $methodName;
	public $exception;
	public $response;
	public $output;

	private $beforeControllerThrowsEx;

	/**
	 * @param boolean $beforeControllerThrowsEx
	 */
	public function __construct($beforeControllerThrowsEx) {
		self::$beforeControllerCalled = 0;
		self::$afterControllerCalled = 0;
		self::$afterExceptionCalled = 0;
		self::$beforeOutputCalled = 0;
		$this->beforeControllerThrowsEx = $beforeControllerThrowsEx;
	}

	public function beforeController($controller, $methodName) {
		self::$beforeControllerCalled++;
		$this->beforeControllerOrder = self::$beforeControllerCalled;
		$this->controller = $controller;
		$this->methodName = $methodName;
		if ($this->beforeControllerThrowsEx) {
			throw new \Exception();
		}
	}

	public function afterException($controller, $methodName, \Exception $exception) {
		self::$afterExceptionCalled++;
		$this->afterExceptionOrder = self::$afterExceptionCalled;
		$this->controller = $controller;
		$this->methodName = $methodName;
		$this->exception = $exception;
		parent::afterException($controller, $methodName, $exception);
	}

	public function afterController($controller, $methodName, Response $response) {
		self::$afterControllerCalled++;
		$this->afterControllerOrder = self::$afterControllerCalled;
		$this->controller = $controller;
		$this->methodName = $methodName;
		$this->response = $response;
		return parent::afterController($controller, $methodName, $response);
	}

	public function beforeOutput($controller, $methodName, $output) {
		self::$beforeOutputCalled++;
		$this->beforeOutputOrder = self::$beforeOutputCalled;
		$this->controller = $controller;
		$this->methodName = $methodName;
		$this->output = $output;
		return parent::beforeOutput($controller, $methodName, $output);
	}
}


class MiddlewareDispatcherTest extends \Test\TestCase {
	public $exception;
	public $response;
	private $out;
	private $method;
	private $controller;

	/**
	 * @var MiddlewareDispatcher
	 */
	private $dispatcher;

	protected function setUp(): void {
		parent::setUp();

		$this->dispatcher = new MiddlewareDispatcher();
		$this->controller = $this->getControllerMock();
		$this->method = 'method';
		$this->response = new Response();
		$this->out = 'hi';
		$this->exception = new \Exception();
	}


	private function getControllerMock() {
		return $this->getMockBuilder('OCP\AppFramework\Controller')
			->setMethods(['method'])
			->setConstructorArgs(['app',
				new Request(
					['method' => 'GET'],
					$this->createMock(IRequestId::class),
					$this->createMock(IConfig::class)
				)
			])->getMock();
	}


	private function getMiddleware($beforeControllerThrowsEx = false) {
		$m1 = new TestMiddleware($beforeControllerThrowsEx);
		$this->dispatcher->registerMiddleware($m1);
		return $m1;
	}


	public function testAfterExceptionShouldReturnResponseOfMiddleware(): void {
		$response = new Response();
		$m1 = $this->getMockBuilder('\OCP\AppFramework\Middleware')
			->setMethods(['afterException', 'beforeController'])
			->getMock();
		$m1->expects($this->never())
			->method('afterException');

		$m2 = $this->getMockBuilder('OCP\AppFramework\Middleware')
			->setMethods(['afterException', 'beforeController'])
			->getMock();
		$m2->expects($this->once())
			->method('afterException')
			->willReturn($response);

		$this->dispatcher->registerMiddleware($m1);
		$this->dispatcher->registerMiddleware($m2);

		$this->dispatcher->beforeController($this->controller, $this->method);
		$this->assertEquals($response, $this->dispatcher->afterException($this->controller, $this->method, $this->exception));
	}


	public function testAfterExceptionShouldThrowAgainWhenNotHandled(): void {
		$m1 = new TestMiddleware(false);
		$m2 = new TestMiddleware(true);

		$this->dispatcher->registerMiddleware($m1);
		$this->dispatcher->registerMiddleware($m2);

		$this->expectException(\Exception::class);
		$this->dispatcher->beforeController($this->controller, $this->method);
		$this->dispatcher->afterException($this->controller, $this->method, $this->exception);
	}


	public function testBeforeControllerCorrectArguments(): void {
		$m1 = $this->getMiddleware();
		$this->dispatcher->beforeController($this->controller, $this->method);

		$this->assertEquals($this->controller, $m1->controller);
		$this->assertEquals($this->method, $m1->methodName);
	}


	public function testAfterControllerCorrectArguments(): void {
		$m1 = $this->getMiddleware();

		$this->dispatcher->afterController($this->controller, $this->method, $this->response);

		$this->assertEquals($this->controller, $m1->controller);
		$this->assertEquals($this->method, $m1->methodName);
		$this->assertEquals($this->response, $m1->response);
	}


	public function testAfterExceptionCorrectArguments(): void {
		$m1 = $this->getMiddleware();

		$this->expectException(\Exception::class);

		$this->dispatcher->beforeController($this->controller, $this->method);
		$this->dispatcher->afterException($this->controller, $this->method, $this->exception);

		$this->assertEquals($this->controller, $m1->controller);
		$this->assertEquals($this->method, $m1->methodName);
		$this->assertEquals($this->exception, $m1->exception);
	}


	public function testBeforeOutputCorrectArguments(): void {
		$m1 = $this->getMiddleware();

		$this->dispatcher->beforeOutput($this->controller, $this->method, $this->out);

		$this->assertEquals($this->controller, $m1->controller);
		$this->assertEquals($this->method, $m1->methodName);
		$this->assertEquals($this->out, $m1->output);
	}


	public function testBeforeControllerOrder(): void {
		$m1 = $this->getMiddleware();
		$m2 = $this->getMiddleware();

		$this->dispatcher->beforeController($this->controller, $this->method);

		$this->assertEquals(1, $m1->beforeControllerOrder);
		$this->assertEquals(2, $m2->beforeControllerOrder);
	}

	public function testAfterControllerOrder(): void {
		$m1 = $this->getMiddleware();
		$m2 = $this->getMiddleware();

		$this->dispatcher->afterController($this->controller, $this->method, $this->response);

		$this->assertEquals(2, $m1->afterControllerOrder);
		$this->assertEquals(1, $m2->afterControllerOrder);
	}


	public function testAfterExceptionOrder(): void {
		$m1 = $this->getMiddleware();
		$m2 = $this->getMiddleware();

		$this->expectException(\Exception::class);
		$this->dispatcher->beforeController($this->controller, $this->method);
		$this->dispatcher->afterException($this->controller, $this->method, $this->exception);

		$this->assertEquals(1, $m1->afterExceptionOrder);
		$this->assertEquals(1, $m2->afterExceptionOrder);
	}


	public function testBeforeOutputOrder(): void {
		$m1 = $this->getMiddleware();
		$m2 = $this->getMiddleware();

		$this->dispatcher->beforeOutput($this->controller, $this->method, $this->out);

		$this->assertEquals(2, $m1->beforeOutputOrder);
		$this->assertEquals(1, $m2->beforeOutputOrder);
	}


	public function testExceptionShouldRunAfterExceptionOfOnlyPreviouslyExecutedMiddlewares(): void {
		$m1 = $this->getMiddleware();
		$m2 = $this->getMiddleware(true);
		$m3 = $this->createMock(Middleware::class);
		$m3->expects($this->never())
			->method('afterException');
		$m3->expects($this->never())
			->method('beforeController');
		$m3->expects($this->never())
			->method('afterController');
		$m3->method('beforeOutput')
			->willReturnArgument(2);

		$this->dispatcher->registerMiddleware($m3);

		$this->dispatcher->beforeOutput($this->controller, $this->method, $this->out);

		$this->assertEquals(2, $m1->beforeOutputOrder);
		$this->assertEquals(1, $m2->beforeOutputOrder);
	}
}