[TwigBridge] added an extension for the HttpKernel component

src/Symfony/Bridge/Twig/Extension/HttpKernelExtension.php

@@ -0,0 +1,95 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Bridge\Twig\Extension;
+
+use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpKernel\KernelEvents;
+use Symfony\Component\HttpKernel\HttpKernelInterface;
+use Symfony\Component\HttpKernel\Event\GetResponseEvent;
+use Symfony\Component\EventDispatcher\EventSubscriberInterface;
+
+/**
+ * Provides integration with the HttpKernel component.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class HttpKernelExtension extends \Twig_Extension implements EventSubscriberInterface
+{
+    private $kernel;
+    private $request;
+
+    /**
+     * Constructor.
+     *
+     * @param HttpKernelInterface $kernel A HttpKernelInterface install
+     */
+    public function __construct(HttpKernelInterface $kernel)
+    {
+        $this->kernel = $kernel;
+    }
+
+    public function getFunctions()
+    {
+        return array(
+            'render' => new \Twig_Function_Method($this, 'render', array('needs_environment' => true, 'is_safe' => array('html'))),
+        );
+    }
+
+    /**
+     * Renders a URI.
+     *
+     * @param \Twig_Environment $twig A \Twig_Environment instance
+     * @param string            $uri  The URI to render
+     *
+     * @return string The Response content
+     */
+    public function render(\Twig_Environment $twig, $uri)
+    {
+        if (null !== $this->request) {
+            $cookies = $this->request->cookies->all();
+            $server = $this->request->server->all();
+        } else {
+            $cookies = array();
+            $server = array();
+        }
+
+        $subRequest = Request::create($uri, 'get', array(), $cookies, array(), $server);
+        if (null !== $this->request && $this->request->getSession()) {
+            $subRequest->setSession($this->request->getSession());
+        }
+
+        $response = $this->kernel->handle($subRequest, HttpKernelInterface::SUB_REQUEST, false);
+
+        if (!$response->isSuccessful()) {
+            throw new \RuntimeException(sprintf('Error when rendering "%s" (Status code is %s).', $subRequest->getUri(), $response->getStatusCode()));
+        }
+
+        return $response->getContent();
+    }
+
+    public function onKernelRequest(GetResponseEvent $event)
+    {
+        $this->request = $event->getRequest();
+    }
+
+    public static function getSubscribedEvents()
+    {
+        return array(
+            KernelEvents::REQUEST => array('onKernelRequest'),
+        );
+    }
+
+    public function getName()
+    {
+        return 'http_kernel';
+    }
+}

src/Symfony/Bridge/Twig/Tests/Extension/HttpKernelExtensionTest.php

@@ -0,0 +1,73 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Bridge\Twig\Tests\Extension;
+
+use Symfony\Bridge\Twig\Extension\HttpKernelExtension;
+use Symfony\Bridge\Twig\Tests\TestCase;
+use Symfony\Component\HttpFoundation\Response;
+use Symfony\Component\HttpKernel\HttpKernelInterface;
+
+class HttpKernelExtensionTest extends TestCase
+{
+    protected function setUp()
+    {
+        if (!class_exists('Symfony\Component\HttpKernel\HttpKernel')) {
+            $this->markTestSkipped('The "HttpKernel" component is not available');
+        }
+
+        if (!class_exists('Twig_Environment')) {
+            $this->markTestSkipped('Twig is not available.');
+        }
+    }
+
+    public function testRenderWithoutMasterRequest()
+    {
+        $kernel = $this->getKernel($this->returnValue(new Response('foo')));
+
+        $this->assertEquals('foo', $this->renderTemplate($kernel));
+    }
+
+    /**
+     * @expectedException \Twig_Error_Runtime
+     */
+    public function testRenderWithError()
+    {
+        $kernel = $this->getKernel($this->throwException(new \Exception('foo')));
+
+        $loader = new \Twig_Loader_Array(array('index' => '{{ render("foo") }}'));
+        $twig = new \Twig_Environment($loader, array('debug' => true, 'cache' => false));
+        $twig->addExtension(new HttpKernelExtension($kernel));
+
+        $this->renderTemplate($kernel);
+    }
+
+    protected function getKernel($return)
+    {
+        $kernel = $this->getMock('Symfony\Component\HttpKernel\HttpKernelInterface');
+        $kernel
+            ->expects($this->once())
+            ->method('handle')
+            ->will($return)
+        ;
+
+        return $kernel;
+    }
+
+    protected function renderTemplate(HttpKernelInterface $kernel, $template = '{{ render("foo") }}')
+    {
+        $loader = new \Twig_Loader_Array(array('index' => $template));
+        $twig = new \Twig_Environment($loader, array('debug' => true, 'cache' => false));
+        $twig->addExtension(new HttpKernelExtension($kernel));
+
+        return $twig->render('index');
+    }
+}

src/Symfony/Bridge/Twig/composer.json

@@ -21,6 +21,7 @@
     },
     "require-dev": {
         "symfony/form": "2.2.*",
+        "symfony/http-kernel": "2.2.*",
         "symfony/routing": "2.2.*",
         "symfony/templating": "2.2.*",
         "symfony/translation": "2.2.*",
@@ -29,6 +30,7 @@
     },
     "suggest": {
         "symfony/form": "2.2.*",
+        "symfony/http-kernel": "2.2.*",
         "symfony/routing": "2.2.*",
         "symfony/templating": "2.2.*",
         "symfony/translation": "2.2.*",