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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\Request;
use Symfony\Component\HttpFoundation\Response;
use Symfony\Component\HttpKernel\Controller\ControllerReference;
use Symfony\Component\HttpKernel\HttpCache\SurrogateInterface;
use Symfony\Component\HttpKernel\UriSigner;
/**
* Implements Surrogate rendering strategy.
*
* @author Fabien Potencier <fabien@symfony.com>
*/
abstract class AbstractSurrogateFragmentRenderer extends RoutableFragmentRenderer
{
private $surrogate;
private $inlineStrategy;
private $signer;
/**
* Constructor.
*
* The "fallback" strategy when surrogate is not available should always be an
* instance of InlineFragmentRenderer.
*
* @param SurrogateInterface $surrogate An Surrogate instance
* @param FragmentRendererInterface $inlineStrategy The inline strategy to use when the surrogate is not supported
* @param UriSigner $signer
*/
public function __construct(SurrogateInterface $surrogate = null, FragmentRendererInterface $inlineStrategy, UriSigner $signer = null)
{
$this->surrogate = $surrogate;
$this->inlineStrategy = $inlineStrategy;
$this->signer = $signer;
}
/**
* {@inheritdoc}
*
* Note that if the current Request has no surrogate capability, this method
* falls back to use the inline rendering strategy.
*
* Additional available options:
*
* * alt: an alternative URI to render in case of an error
* * comment: a comment to add when returning the surrogate tag
*
* Note, that not all surrogate strategies support all options. For now
* 'alt' and 'comment' are only supported by ESI.
*
* @see Symfony\Component\HttpKernel\HttpCache\SurrogateInterface
*/
public function render($uri, Request $request, array $options = array())
{
if (!$this->surrogate || !$this->surrogate->hasSurrogateCapability($request)) {
return $this->inlineStrategy->render($uri, $request, $options);
}
if ($uri instanceof ControllerReference) {
$uri = $this->generateSignedFragmentUri($uri, $request);
}
$alt = isset($options['alt']) ? $options['alt'] : null;
if ($alt instanceof ControllerReference) {
$alt = $this->generateSignedFragmentUri($alt, $request);
}
$tag = $this->surrogate->renderIncludeTag($uri, $alt, isset($options['ignore_errors']) ? $options['ignore_errors'] : false, isset($options['comment']) ? $options['comment'] : '');
return new Response($tag);
}
private function generateSignedFragmentUri($uri, Request $request)
{
if (null === $this->signer) {
throw new \LogicException('You must use a URI when using the ESI rendering strategy or set a URL signer.');
}
// we need to sign the absolute URI, but want to return the path only.
$fragmentUri = $this->signer->sign($this->generateFragmentUri($uri, $request, true));
return substr($fragmentUri, strlen($request->getSchemeAndHttpHost()));
}
}