Issue #2497693 by marvin_B8, joshi.rohit100, borisson_, Crell: Add PSR-7 to Symfony Response View listener

core/core.services.yml

@@ -890,6 +890,11 @@ services:
     class: Drupal\Core\EventSubscriber\RouteMethodSubscriber
     tags:
       - { name: event_subscriber }
+  psr_response_view_subscriber:
+    class: Drupal\Core\EventSubscriber\PsrResponseSubscriber
+    arguments: ['@psr7.http_foundation_factory']
+    tags:
+      - { name: event_subscriber }
 
   # Main content view subscriber plus the renderers it uses.
   main_content_view_subscriber:

core/lib/Drupal/Core/EventSubscriber/PsrResponseSubscriber.php

@@ -0,0 +1,62 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\Core\EventSubscriber\PsrResponseSubscriber.
+ */
+
+namespace Drupal\Core\EventSubscriber;
+
+use Psr\Http\Message\ResponseInterface;
+
+use Symfony\Bridge\PsrHttpMessage\HttpFoundationFactoryInterface;
+use Symfony\Component\EventDispatcher\EventSubscriberInterface;
+use Symfony\Component\HttpKernel\Event\GetResponseForControllerResultEvent;
+use Symfony\Component\HttpKernel\KernelEvents;
+
+/**
+ * Response subscriber for handling PSR-7 responses.
+ */
+class PsrResponseSubscriber implements EventSubscriberInterface {
+
+  /**
+   * The httpFoundation factory.
+   *
+   * @var \Symfony\Bridge\PsrHttpMessage\HttpFoundationFactoryInterface
+   */
+  protected $httpFoundationFactory;
+
+  /**
+   * Constructs a new PathRootsSubscriber instance.
+   *
+   * @param \Symfony\Bridge\PsrHttpMessage\HttpFoundationFactoryInterface $http_foundation_factory
+   *    The httpFoundation factory.
+   */
+  public function __construct(HttpFoundationFactoryInterface $http_foundation_factory) {
+    $this->httpFoundationFactory = $http_foundation_factory;
+  }
+
+  /**
+   * Converts a PSR-7 response to a Symfony response.
+   *
+   * @param \Symfony\Component\HttpKernel\Event\GetResponseForControllerResultEvent $event
+   *   The Event to process.
+   */
+  public function onKernelView(GetResponseForControllerResultEvent $event) {
+    $controller_result = $event->getControllerResult();
+
+    if ($controller_result instanceof ResponseInterface) {
+      $event->setResponse($this->httpFoundationFactory->createResponse($controller_result));
+    }
+
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function getSubscribedEvents() {
+    $events[KernelEvents::VIEW][] = ['onKernelView'];
+    return $events;
+  }
+
+}

core/modules/system/src/Tests/Routing/RouterTest.php

@@ -199,6 +199,15 @@ class RouterTest extends WebTestBase {
     $this->assertText('Route not matched.');
   }
 
+  /**
+   * Tests that a PSR-7 response works.
+   */
+  public function testRouterResponsePsr7() {
+    $this->drupalGet('/router_test/test23');
+    $this->assertResponse(200);
+    $this->assertText('test23');
+  }
+
   /**
    * Tests the user account on the DIC.
    */

core/modules/system/tests/modules/router_test_directory/router_test.routing.yml

@@ -141,6 +141,13 @@ router_test.22:
   requirements:
     _role: 'anonymous'
 
+router_test.23:
+  path: '/router_test/test23'
+  defaults:
+    _controller: '\Drupal\router_test\TestControllers::test23'
+  requirements:
+    _access: 'TRUE'
+
 router_test.hierarchy_parent:
   path: '/menu-test/parent'
   defaults:

core/modules/system/tests/modules/router_test_directory/src/TestControllers.php

@@ -12,6 +12,8 @@ use Drupal\Core\ParamConverter\ParamNotConvertedException;
 use Drupal\user\UserInterface;
 use Symfony\Cmf\Component\Routing\RouteObjectInterface;
 use Symfony\Component\HttpFoundation\Response;
+use Zend\Diactoros\Response\HtmlResponse;
+
 
 /**
  * Controller routines for testing the routing system.
@@ -102,6 +104,10 @@ class TestControllers {
     return new CacheableResponse('test21');
   }
 
+  public function test23() {
+    return new HtmlResponse('test23');
+  }
+
   /**
    * Throws an exception.
    *

core/tests/Drupal/Tests/Core/EventSubscriber/PsrResponseSubscriberTest.php

@@ -0,0 +1,99 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\Tests\Core\EventSubscriber\PsrResponseSubscriberTest.
+ */
+
+namespace Drupal\Tests\Core\EventSubscriber;
+
+use Drupal\Tests\UnitTestCase;
+use \Drupal\Core\EventSubscriber\PsrResponseSubscriber;
+
+/**
+ * @coversDefaultClass \Drupal\Core\EventSubscriber\PsrResponseSubscriber
+ * @group EventSubscriber
+ */
+class PsrResponseSubscriberTest extends UnitTestCase {
+
+  /**
+   * The tested path root subscriber.
+   *
+   * @var \Drupal\Core\EventSubscriber\PsrResponseSubscriber
+   */
+  protected $psrResponseSubscriber;
+
+  /**
+   * The tested path root subscriber.
+   *
+   * @var \Symfony\Bridge\PsrHttpMessage\HttpFoundationFactoryInterface|\PHPUnit_Framework_MockObject_MockObject
+   */
+  protected $httpFoundationFactoryMock;
+
+  /**
+   * {@inheritdoc}
+   */
+  public function setUp() {
+    $factory = $this->getMock('Symfony\Bridge\PsrHttpMessage\HttpFoundationFactoryInterface', [], [], '', NULL);
+    $factory
+      ->expects($this->any())
+      ->method('createResponse')
+      ->willReturn($this->getMock('Symfony\Component\HttpFoundation\Response'));
+
+    $this->httpFoundationFactoryMock = $factory;
+
+    $this->psrResponseSubscriber = new PsrResponseSubscriber($this->httpFoundationFactoryMock);
+  }
+
+  /**
+   * Tests altering and finished event.
+   *
+   * @covers ::onKernelView
+   */
+  public function testConvertsControllerResult() {
+    $event = $this->createEventMock($this->getMock('Psr\Http\Message\ResponseInterface'));
+    $event
+      ->expects($this->once())
+      ->method('setResponse')
+      ->with($this->isInstanceOf('Symfony\Component\HttpFoundation\Response'));
+    $this->psrResponseSubscriber->onKernelView($event);
+  }
+
+
+  /**
+   * Tests altering and finished event.
+   *
+   * @covers ::onKernelView
+   */
+  public function testDoesNotConvertControllerResult() {
+    $event = $this->createEventMock([]);
+    $event
+      ->expects($this->never())
+      ->method('setResponse');
+    $this->psrResponseSubscriber->onKernelView($event);
+    $event = $this->createEventMock(NULL);
+    $event
+      ->expects($this->never())
+      ->method('setResponse');
+    $this->psrResponseSubscriber->onKernelView($event);
+  }
+
+  /**
+   * Sets up an alias event that return $controllerResult.
+   *
+   * @param mixed $controller_result
+   *    The return Object.
+   *
+   * @return \Symfony\Component\HttpKernel\Event\GetResponseForControllerResultEvent|\PHPUnit_Framework_MockObject_MockObject
+   *    A mock object to test.
+   */
+  protected function createEventMock($controller_result) {
+    $event = $this->getMock('Symfony\Component\HttpKernel\Event\GetResponseForControllerResultEvent', [], [], '', NULL);
+    $event
+      ->expects($this->once())
+      ->method('getControllerResult')
+      ->willReturn($controller_result);
+    return $event;
+  }
+
+}