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FragmentHandler.php
001 <?php
002
003 /*
004 * This file is part of the Symfony package.
005 *
006 * (c) Fabien Potencier <fabien@symfony.com>
007 *
008 * For the full copyright and license information, please view the LICENSE
009 * file that was distributed with this source code.
010 */
011
012 namespace Symfony\Component\HttpKernel\Fragment;
013
014 use Symfony\Component\HttpFoundation\RequestStack;
015 use Symfony\Component\HttpFoundation\Response;
016 use Symfony\Component\HttpFoundation\StreamedResponse;
017 use Symfony\Component\HttpKernel\Controller\ControllerReference;
018
019 /**
020 * Renders a URI that represents a resource fragment.
021 *
022 * This class handles the rendering of resource fragments that are included into
023 * a main resource. The handling of the rendering is managed by specialized renderers.
024 *
025 * @author Fabien Potencier <fabien@symfony.com>
026 *
027 * @see FragmentRendererInterface
028 */
029 class FragmentHandler
030 {
031 private $debug;
032 private $renderers = [];
033 private $requestStack;
034
035 /**
036 * @param RequestStack $requestStack The Request stack that controls the lifecycle of requests
037 * @param FragmentRendererInterface[] $renderers An array of FragmentRendererInterface instances
038 * @param bool $debug Whether the debug mode is enabled or not
039 */
040 public function __construct(RequestStack $requestStack, array $renderers = [], $debug = false)
041 {
042 $this->requestStack = $requestStack;
043 foreach ($renderers as $renderer) {
044 $this->addRenderer($renderer);
045 }
046 $this->debug = $debug;
047 }
048
049 /**
050 * Adds a renderer.
051 */
052 public function addRenderer(FragmentRendererInterface $renderer)
053 {
054 $this->renderers[$renderer->getName()] = $renderer;
055 }
056
057 /**
058 * Renders a URI and returns the Response content.
059 *
060 * Available options:
061 *
062 * * ignore_errors: true to return an empty string in case of an error
063 *
064 * @param string|ControllerReference $uri A URI as a string or a ControllerReference instance
065 * @param string $renderer The renderer name
066 * @param array $options An array of options
067 *
068 * @return string|null The Response content or null when the Response is streamed
069 *
070 * @throws \InvalidArgumentException when the renderer does not exist
071 * @throws \LogicException when no master request is being handled
072 */
073 public function render($uri, $renderer = 'inline', array $options = [])
074 {
075 if (!isset($options['ignore_errors'])) {
076 $options['ignore_errors'] = !$this->debug;
077 }
078
079 if (!isset($this->renderers[$renderer])) {
080 throw new \InvalidArgumentException(sprintf('The "%s" renderer does not exist.', $renderer));
081 }
082
083 if (!$request = $this->requestStack->getCurrentRequest()) {
084 throw new \LogicException('Rendering a fragment can only be done when handling a Request.');
085 }
086
087 return $this->deliver($this->renderers[$renderer]->render($uri, $request, $options));
088 }
089
090 /**
091 * Delivers the Response as a string.
092 *
093 * When the Response is a StreamedResponse, the content is streamed immediately
094 * instead of being returned.
095 *
096 * @return string|null The Response content or null when the Response is streamed
097 *
098 * @throws \RuntimeException when the Response is not successful
099 */
100 protected function deliver(Response $response)
101 {
102 if (!$response->isSuccessful()) {
103 throw new \RuntimeException(sprintf('Error when rendering "%s" (Status code is %d).', $this->requestStack->getCurrentRequest()->getUri(), $response->getStatusCode()));
104 }
105
106 if (!$response instanceof StreamedResponse) {
107 return $response->getContent();
108 }
109
110 $response->sendContent();
111
112 return null;
113 }
114 }
115