FragmentHandler.php
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<?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\Component\HttpKernel\Fragment;
use Symfony\Component\HttpFoundation\RequestStack;
use Symfony\Component\HttpFoundation\Response;
use Symfony\Component\HttpFoundation\StreamedResponse;
use Symfony\Component\HttpKernel\Controller\ControllerReference;
use Symfony\Component\HttpKernel\Exception\HttpException;
/**
* Renders a URI that represents a resource fragment.
*
* This class handles the rendering of resource fragments that are included into
* a main resource. The handling of the rendering is managed by specialized renderers.
*
* @author Fabien Potencier <fabien@symfony.com>
*
* @see FragmentRendererInterface
*/
class FragmentHandler
{
private $debug;
private $renderers = [];
private $requestStack;
/**
* @param FragmentRendererInterface[] $renderers An array of FragmentRendererInterface instances
* @param bool $debug Whether the debug mode is enabled or not
*/
public function __construct(RequestStack $requestStack, array $renderers = [], bool $debug = false)
{
$this->requestStack = $requestStack;
foreach ($renderers as $renderer) {
$this->addRenderer($renderer);
}
$this->debug = $debug;
}
/**
* Adds a renderer.
*/
public function addRenderer(FragmentRendererInterface $renderer)
{
$this->renderers[$renderer->getName()] = $renderer;
}
/**
* Renders a URI and returns the Response content.
*
* Available options:
*
* * ignore_errors: true to return an empty string in case of an error
*
* @param string|ControllerReference $uri A URI as a string or a ControllerReference instance
*
* @return string|null
*
* @throws \InvalidArgumentException when the renderer does not exist
* @throws \LogicException when no main request is being handled
*/
public function render($uri, string $renderer = 'inline', array $options = [])
{
if (!isset($options['ignore_errors'])) {
$options['ignore_errors'] = !$this->debug;
}
if (!isset($this->renderers[$renderer])) {
throw new \InvalidArgumentException(sprintf('The "%s" renderer does not exist.', $renderer));
}
if (!$request = $this->requestStack->getCurrentRequest()) {
throw new \LogicException('Rendering a fragment can only be done when handling a Request.');
}
return $this->deliver($this->renderers[$renderer]->render($uri, $request, $options));
}
/**
* Delivers the Response as a string.
*
* When the Response is a StreamedResponse, the content is streamed immediately
* instead of being returned.
*
* @return string|null The Response content or null when the Response is streamed
*
* @throws \RuntimeException when the Response is not successful
*/
protected function deliver(Response $response)
{
if (!$response->isSuccessful()) {
$responseStatusCode = $response->getStatusCode();
throw new \RuntimeException(sprintf('Error when rendering "%s" (Status code is %d).', $this->requestStack->getCurrentRequest()->getUri(), $responseStatusCode), 0, new HttpException($responseStatusCode));
}
if (!$response instanceof StreamedResponse) {
return $response->getContent();
}
$response->sendContent();
return null;
}
}