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Filename : AbstractSurrogateFragmentRenderer.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\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)) {
            if ($uri instanceof ControllerReference && $this->containsNonScalars($uri->attributes)) {
                @trigger_error('Passing non-scalar values as part of URI attributes to the ESI and SSI rendering strategies is deprecated since version 3.1, and will be removed in 4.0. Use a different rendering strategy or pass scalar values.', E_USER_DEPRECATED);
            }

            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()));
    }

    private function containsNonScalars(array $values)
    {
        foreach ($values as $value) {
            if (is_array($value) && $this->containsNonScalars($value)) {
                return true;
            } elseif (!is_scalar($value) && null !== $value) {
                return true;
            }
        }

        return false;
    }
}