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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;
/**
* The "fallback" strategy when surrogate is not available should always be an
* instance of InlineFragmentRenderer.
*
* @param FragmentRendererInterface $inlineStrategy The inline strategy to use when the surrogate is not supported
*/
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 $options = [])
{
if (!$this->surrogate || !$this->surrogate->hasSurrogateCapability($request)) {
if ($uri instanceof ControllerReference && $this->containsNonScalars($uri->attributes)) {
throw new \InvalidArgumentException('Passing non-scalar values as part of URI attributes to the ESI and SSI rendering strategies is not supported. Use a different rendering strategy or pass scalar values.');
}
return $this->inlineStrategy->render($uri, $request, $options);
}
if ($uri instanceof ControllerReference) {
$uri = $this->generateSignedFragmentUri($uri, $request);
}
$alt = $options['alt'] ?? null;
if ($alt instanceof ControllerReference) {
$alt = $this->generateSignedFragmentUri($alt, $request);
}
$tag = $this->surrogate->renderIncludeTag($uri, $alt, $options['ignore_errors'] ?? false, $options['comment'] ?? '');
return new Response($tag);
}
private function generateSignedFragmentUri(ControllerReference $uri, Request $request): string
{
return (new FragmentUriGenerator($this->fragmentPath, $this->signer))->generate($uri, $request);
}
private function containsNonScalars(array $values): bool
{
foreach ($values as $value) {
if (\is_array($value)) {
return $this->containsNonScalars($value);
} elseif (!is_scalar($value) && null !== $value) {
return true;
}
}
return false;
}
}