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- Veröffentlicht
- 28.08.2024
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Esi.php
001 <?php
002
003 /*
004 * This file is part of the Symfony package.
005 *
006 * (c) Fabien Potencier <fabien@symfony.com>
007 *
008 * For the full copyright and license information, please view the LICENSE
009 * file that was distributed with this source code.
010 */
011
012 namespace Symfony\Component\HttpKernel\HttpCache;
013
014 use Symfony\Component\HttpFoundation\Request;
015 use Symfony\Component\HttpFoundation\Response;
016
017 /**
018 * Esi implements the ESI capabilities to Request and Response instances.
019 *
020 * For more information, read the following W3C notes:
021 *
022 * * ESI Language Specification 1.0 (http://www.w3.org/TR/esi-lang)
023 *
024 * * Edge Architecture Specification (http://www.w3.org/TR/edge-arch)
025 *
026 * @author Fabien Potencier <fabien@symfony.com>
027 */
028 class Esi extends AbstractSurrogate
029 {
030 public function getName()
031 {
032 return 'esi';
033 }
034
035 /**
036 * {@inheritdoc}
037 */
038 public function addSurrogateControl(Response $response)
039 {
040 if (false !== strpos($response->getContent(), '<esi:include')) {
041 $response->headers->set('Surrogate-Control', 'content="ESI/1.0"');
042 }
043 }
044
045 /**
046 * {@inheritdoc}
047 */
048 public function renderIncludeTag($uri, $alt = null, $ignoreErrors = true, $comment = '')
049 {
050 $html = sprintf('<esi:include src="%s"%s%s />',
051 $uri,
052 $ignoreErrors ? ' onerror="continue"' : '',
053 $alt ? sprintf(' alt="%s"', $alt) : ''
054 );
055
056 if (!empty($comment)) {
057 return sprintf("<esi:comment text=\"%s\" />\n%s", $comment, $html);
058 }
059
060 return $html;
061 }
062
063 /**
064 * {@inheritdoc}
065 */
066 public function process(Request $request, Response $response)
067 {
068 $type = $response->headers->get('Content-Type');
069 if (empty($type)) {
070 $type = 'text/html';
071 }
072
073 $parts = explode(';', $type);
074 if (!\in_array($parts[0], $this->contentTypes)) {
075 return $response;
076 }
077
078 // we don't use a proper XML parser here as we can have ESI tags in a plain text response
079 $content = $response->getContent();
080 $content = preg_replace('#<esi\:remove>.*?</esi\:remove>#s', '', $content);
081 $content = preg_replace('#<esi\:comment[^>]+>#s', '', $content);
082
083 $chunks = preg_split('#<esi\:include\s+(.*?)\s*(?:/|</esi\:include)>#', $content, -1, \PREG_SPLIT_DELIM_CAPTURE);
084 $chunks[0] = str_replace($this->phpEscapeMap[0], $this->phpEscapeMap[1], $chunks[0]);
085
086 $i = 1;
087 while (isset($chunks[$i])) {
088 $options = [];
089 preg_match_all('/(src|onerror|alt)="([^"]*?)"/', $chunks[$i], $matches, \PREG_SET_ORDER);
090 foreach ($matches as $set) {
091 $options[$set[1]] = $set[2];
092 }
093
094 if (!isset($options['src'])) {
095 throw new \RuntimeException('Unable to process an ESI tag without a "src" attribute.');
096 }
097
098 $chunks[$i] = sprintf('<?php echo $this->surrogate->handle($this, %s, %s, %s) ?>'."\n",
099 var_export($options['src'], true),
100 var_export(isset($options['alt']) ? $options['alt'] : '', true),
101 isset($options['onerror']) && 'continue' === $options['onerror'] ? 'true' : 'false'
102 );
103 ++$i;
104 $chunks[$i] = str_replace($this->phpEscapeMap[0], $this->phpEscapeMap[1], $chunks[$i]);
105 ++$i;
106 }
107 $content = implode('', $chunks);
108
109 $response->setContent($content);
110 $response->headers->set('X-Body-Eval', 'ESI');
111
112 // remove ESI/1.0 from the Surrogate-Control header
113 $this->removeFromControl($response);
114
115 return $response;
116 }
117 }
118