235 lines
7.9 KiB
PHP
235 lines
7.9 KiB
PHP
<?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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use Symfony\Component\HttpKernel\HttpKernelInterface;
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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
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{
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private $contentTypes;
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/**
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* Constructor.
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*
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* @param array $contentTypes An array of content-type that should be parsed for ESI information.
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* (default: text/html, text/xml, and application/xml)
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*/
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public function __construct(array $contentTypes = array('text/html', 'text/xml', 'application/xml'))
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{
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$this->contentTypes = $contentTypes;
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}
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/**
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* Returns a new cache strategy instance.
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*
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* @return EsiResponseCacheStrategyInterface A EsiResponseCacheStrategyInterface instance
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*/
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public function createCacheStrategy()
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{
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return new EsiResponseCacheStrategy();
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}
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/**
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* Checks that at least one surrogate has ESI/1.0 capability.
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*
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* @param Request $request A Request instance
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*
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* @return Boolean true if one surrogate has ESI/1.0 capability, false otherwise
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*/
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public function hasSurrogateEsiCapability(Request $request)
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{
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if (null === $value = $request->headers->get('Surrogate-Capability')) {
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return false;
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}
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return false !== strpos($value, 'ESI/1.0');
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}
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/**
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* Adds ESI/1.0 capability to the given Request.
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*
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* @param Request $request A Request instance
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*/
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public function addSurrogateEsiCapability(Request $request)
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{
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$current = $request->headers->get('Surrogate-Capability');
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$new = 'symfony2="ESI/1.0"';
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$request->headers->set('Surrogate-Capability', $current ? $current.', '.$new : $new);
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}
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/**
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* Adds HTTP headers to specify that the Response needs to be parsed for ESI.
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*
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* This method only adds an ESI HTTP header if the Response has some ESI tags.
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*
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* @param Response $response A Response instance
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*/
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public function addSurrogateControl(Response $response)
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{
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if (false !== strpos($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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/**
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* Checks that the Response needs to be parsed for ESI tags.
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*
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* @param Response $response A Response instance
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*
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* @return Boolean true if the Response needs to be parsed, false otherwise
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*/
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public function needsEsiParsing(Response $response)
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{
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if (!$control = $response->headers->get('Surrogate-Control')) {
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return false;
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}
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return (Boolean) preg_match('#content="[^"]*ESI/1.0[^"]*"#', $control);
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}
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/**
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* Renders an ESI tag.
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*
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* @param string $uri A URI
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* @param string $alt An alternate URI
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* @param Boolean $ignoreErrors Whether to ignore errors or not
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* @param string $comment A comment to add as an esi:include tag
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*/
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public function renderIncludeTag($uri, $alt = null, $ignoreErrors = true, $comment = '')
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{
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$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"', $alt) : ''
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);
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if (!empty($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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/**
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* Replaces a Response ESI tags with the included resource content.
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*
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* @param Request $request A Request instance
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* @param Response $response A Response instance
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*/
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public function process(Request $request, Response $response)
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{
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$this->request = $request;
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$type = $response->headers->get('Content-Type');
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if (empty($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)) {
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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 = str_replace(array('<?', '<%'), array('<?php echo "<?"; ?>', '<?php echo "<%"; ?>'), $content);
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$content = preg_replace_callback('#<esi\:include\s+(.*?)\s*(?:/|</esi\:include)>#', array($this, 'handleEsiIncludeTag'), $content);
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$content = preg_replace('#<esi\:comment[^>]*(?:/|</esi\:comment)>#', '', $content);
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$content = preg_replace('#<esi\:remove>.*?</esi\:remove>#', '', $content);
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$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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if ($response->headers->has('Surrogate-Control')) {
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$value = $response->headers->get('Surrogate-Control');
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if ('content="ESI/1.0"' == $value) {
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$response->headers->remove('Surrogate-Control');
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} elseif (preg_match('#,\s*content="ESI/1.0"#', $value)) {
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$response->headers->set('Surrogate-Control', preg_replace('#,\s*content="ESI/1.0"#', '', $value));
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} elseif (preg_match('#content="ESI/1.0",\s*#', $value)) {
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$response->headers->set('Surrogate-Control', preg_replace('#content="ESI/1.0",\s*#', '', $value));
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}
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}
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}
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/**
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* Handles an ESI from the cache.
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*
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* @param HttpCache $cache An HttpCache instance
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* @param string $uri The main URI
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* @param string $alt An alternative URI
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* @param Boolean $ignoreErrors Whether to ignore errors or not
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*/
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public function handle(HttpCache $cache, $uri, $alt, $ignoreErrors)
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{
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$subRequest = Request::create($uri, 'get', array(), $cache->getRequest()->cookies->all(), array(), $cache->getRequest()->server->all());
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try {
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$response = $cache->handle($subRequest, HttpKernelInterface::SUB_REQUEST, true);
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if (!$response->isSuccessful()) {
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throw new \RuntimeException(sprintf('Error when rendering "%s" (Status code is %s).', $subRequest->getUri(), $response->getStatusCode()));
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}
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return $response->getContent();
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} catch (\Exception $e) {
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if ($alt) {
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return $this->handle($cache, $alt, '', $ignoreErrors);
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}
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if (!$ignoreErrors) {
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throw $e;
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}
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}
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}
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/**
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* Handles an ESI include tag (called internally).
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*
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* @param array $attributes An array containing the attributes.
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*
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* @return string The response content for the include.
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*/
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private function handleEsiIncludeTag($attributes)
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{
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$options = array();
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preg_match_all('/(src|onerror|alt)="([^"]*?)"/', $attributes[1], $matches, PREG_SET_ORDER);
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foreach ($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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return sprintf('<?php echo $this->esi->handle($this, \'%s\', \'%s\', %s) ?>'."\n",
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$options['src'],
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isset($options['alt']) ? $options['alt'] : null,
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isset($options['onerror']) && 'continue' == $options['onerror'] ? 'true' : 'false'
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);
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}
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}
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