Subversion-Projekte lars-tiefland.laravel_shop

<?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\HttpCache;

use Symfony\Component\HttpFoundation\Request;

use Symfony\Component\HttpFoundation\Response;

/**

 * Esi implements the ESI capabilities to Request and Response instances.

 *

 * For more information, read the following W3C notes:

 *

 *  * ESI Language Specification 1.0 (http://www.w3.org/TR/esi-lang)

 *

 *  * Edge Architecture Specification (http://www.w3.org/TR/edge-arch)

 *

 * @author Fabien Potencier <fabien@symfony.com>

 */

class Esi extends AbstractSurrogate

{

    public function getName(): string

    {

        return 'esi';

    }

    public function addSurrogateControl(Response $response)

    {

        if (str_contains($response->getContent(), '<esi:include')) {

            $response->headers->set('Surrogate-Control', 'content="ESI/1.0"');

        }

    }

    public function renderIncludeTag(string $uri, string $alt = null, bool $ignoreErrors = true, string $comment = ''): string

    {

        $html = sprintf('<esi:include src="%s"%s%s />',

            $uri,

            $ignoreErrors ? ' onerror="continue"' : '',

            $alt ? sprintf(' alt="%s"', $alt) : ''

        );

        if (!empty($comment)) {

            return sprintf("<esi:comment text=\"%s\" />\n%s", $comment, $html);

        }

        return $html;

    }

    public function process(Request $request, Response $response): Response

    {

        $type = $response->headers->get('Content-Type');

        if (empty($type)) {

            $type = 'text/html';

        }

        $parts = explode(';', $type);

        if (!\in_array($parts[0], $this->contentTypes)) {

            return $response;

        }

        // we don't use a proper XML parser here as we can have ESI tags in a plain text response

        $content = $response->getContent();

        $content = preg_replace('#<esi\:remove>.*?</esi\:remove>#s', '', $content);

        $content = preg_replace('#<esi\:comment[^>]+>#s', '', $content);

        $chunks = preg_split('#<esi\:include\s+(.*?)\s*(?:/|</esi\:include)>#', $content, -1, \PREG_SPLIT_DELIM_CAPTURE);

        $chunks[0] = str_replace($this->phpEscapeMap[0], $this->phpEscapeMap[1], $chunks[0]);

        $i = 1;

        while (isset($chunks[$i])) {

            $options = [];

            preg_match_all('/(src|onerror|alt)="([^"]*?)"/', $chunks[$i], $matches, \PREG_SET_ORDER);

            foreach ($matches as $set) {

                $options[$set[1]] = $set[2];

            }

            if (!isset($options['src'])) {

                throw new \RuntimeException('Unable to process an ESI tag without a "src" attribute.');

            }

            $chunks[$i] = sprintf('<?php echo $this->surrogate->handle($this, %s, %s, %s) ?>'."\n",

                var_export($options['src'], true),

                var_export($options['alt'] ?? '', true),

                isset($options['onerror']) && 'continue' === $options['onerror'] ? 'true' : 'false'

            );

            ++$i;

            $chunks[$i] = str_replace($this->phpEscapeMap[0], $this->phpEscapeMap[1], $chunks[$i]);

            ++$i;

        }

        $content = implode('', $chunks);

        $response->setContent($content);

        $response->headers->set('X-Body-Eval', 'ESI');

        // remove ESI/1.0 from the Surrogate-Control header

        $this->removeFromControl($response);

        return $response;

    }

}