103 lines
3.2 KiB
PHP
103 lines
3.2 KiB
PHP
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<?php
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/*
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* This file is part of the Symfony package.
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*
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* (c) Fabien Potencier <fabien@symfony.com>
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*
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code.
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*/
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namespace Symfony\Component\HttpKernel\HttpCache;
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use Symfony\Component\HttpFoundation\Request;
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use Symfony\Component\HttpFoundation\Response;
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/**
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* Esi implements the ESI capabilities to Request and Response instances.
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*
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* For more information, read the following W3C notes:
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*
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* * ESI Language Specification 1.0 (http://www.w3.org/TR/esi-lang)
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*
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* * Edge Architecture Specification (http://www.w3.org/TR/edge-arch)
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*
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* @author Fabien Potencier <fabien@symfony.com>
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*/
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class Esi extends AbstractSurrogate
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{
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public function getName(): string
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{
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return 'esi';
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}
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public function addSurrogateControl(Response $response): void
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{
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if (str_contains($response->getContent(), '<esi:include')) {
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$response->headers->set('Surrogate-Control', 'content="ESI/1.0"');
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}
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}
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public function renderIncludeTag(string $uri, ?string $alt = null, bool $ignoreErrors = true, string $comment = ''): string
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{
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$html = \sprintf('<esi:include src="%s"%s%s />',
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$uri,
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$ignoreErrors ? ' onerror="continue"' : '',
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$alt ? \sprintf(' alt="%s"', $alt) : ''
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);
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if ($comment) {
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return \sprintf("<esi:comment text=\"%s\" />\n%s", $comment, $html);
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}
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return $html;
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}
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public function process(Request $request, Response $response): Response
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{
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$type = $response->headers->get('Content-Type');
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if (!$type) {
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$type = 'text/html';
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}
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$parts = explode(';', $type);
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if (!\in_array($parts[0], $this->contentTypes, true)) {
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return $response;
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}
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// we don't use a proper XML parser here as we can have ESI tags in a plain text response
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$content = $response->getContent();
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$content = preg_replace('#<esi\:remove>.*?</esi\:remove>#s', '', $content);
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$content = preg_replace('#<esi\:comment[^>]+>#s', '', $content);
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$boundary = self::generateBodyEvalBoundary();
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$chunks = preg_split('#<esi\:include\s+(.*?)\s*(?:/|</esi\:include)>#', $content, -1, \PREG_SPLIT_DELIM_CAPTURE);
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$i = 1;
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while (isset($chunks[$i])) {
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$options = [];
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preg_match_all('/(src|onerror|alt)="([^"]*?)"/', $chunks[$i], $matches, \PREG_SET_ORDER);
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foreach ($matches as $set) {
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$options[$set[1]] = $set[2];
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}
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if (!isset($options['src'])) {
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throw new \RuntimeException('Unable to process an ESI tag without a "src" attribute.');
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}
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$chunks[$i] = $boundary.$options['src']."\n".($options['alt'] ?? '')."\n".('continue' === ($options['onerror'] ?? ''))."\n";
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$i += 2;
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}
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$content = $boundary.implode('', $chunks).$boundary;
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$response->setContent($content);
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$response->headers->set('X-Body-Eval', 'ESI');
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// remove ESI/1.0 from the Surrogate-Control header
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$this->removeFromControl($response);
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return $response;
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}
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}
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