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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\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()
    {
        return 'esi';
    }

/**
     * {@inheritdoc}
     */
    public function addSurrogateControl(Response $response)
    {
        if (false !== strpos($response->getContent(), '<esi:include')) {
            $response->headers->set('Surrogate-Control', 'content="ESI/1.0"');
        }
    }

/**
     * {@inheritdoc}
     */
    public function renderIncludeTag(string $uri, string $alt = null, bool $ignoreErrors = true, string $comment = '')
    {
        $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;
    }

/**
     * {@inheritdoc}
     */
    public function process(Request $request, 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;
    }
}