297 lines
10 KiB
PHP
297 lines
10 KiB
PHP
<?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;
|
|
use Symfony\Component\HttpKernel\HttpKernelInterface;
|
|
|
|
/**
|
|
* 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 implements SurrogateInterface
|
|
{
|
|
private $contentTypes;
|
|
private $phpEscapeMap = array(
|
|
array('<?', '<%', '<s', '<S'),
|
|
array('<?php echo "<?"; ?>', '<?php echo "<%"; ?>', '<?php echo "<s"; ?>', '<?php echo "<S"; ?>'),
|
|
);
|
|
|
|
/**
|
|
* Constructor.
|
|
*
|
|
* @param array $contentTypes An array of content-type that should be parsed for ESI information.
|
|
* (default: text/html, text/xml, application/xhtml+xml, and application/xml)
|
|
*/
|
|
public function __construct(array $contentTypes = array('text/html', 'text/xml', 'application/xhtml+xml', 'application/xml'))
|
|
{
|
|
$this->contentTypes = $contentTypes;
|
|
}
|
|
|
|
public function getName()
|
|
{
|
|
return 'esi';
|
|
}
|
|
|
|
/**
|
|
* Returns a new cache strategy instance.
|
|
*
|
|
* @return ResponseCacheStrategyInterface A ResponseCacheStrategyInterface instance
|
|
*/
|
|
public function createCacheStrategy()
|
|
{
|
|
return new ResponseCacheStrategy();
|
|
}
|
|
|
|
/**
|
|
* Checks that at least one surrogate has ESI/1.0 capability.
|
|
*
|
|
* @param Request $request A Request instance
|
|
*
|
|
* @return bool true if one surrogate has ESI/1.0 capability, false otherwise
|
|
*/
|
|
public function hasSurrogateCapability(Request $request)
|
|
{
|
|
if (null === $value = $request->headers->get('Surrogate-Capability')) {
|
|
return false;
|
|
}
|
|
|
|
return false !== strpos($value, 'ESI/1.0');
|
|
}
|
|
|
|
/**
|
|
* Checks that at least one surrogate has ESI/1.0 capability.
|
|
*
|
|
* @param Request $request A Request instance
|
|
*
|
|
* @return bool true if one surrogate has ESI/1.0 capability, false otherwise
|
|
*
|
|
* @deprecated since version 2.6, to be removed in 3.0. Use hasSurrogateCapability() instead
|
|
*/
|
|
public function hasSurrogateEsiCapability(Request $request)
|
|
{
|
|
@trigger_error('The '.__METHOD__.' method is deprecated since version 2.6 and will be removed in 3.0. Use the hasSurrogateCapability() method instead.', E_USER_DEPRECATED);
|
|
|
|
return $this->hasSurrogateCapability($request);
|
|
}
|
|
|
|
/**
|
|
* Adds ESI/1.0 capability to the given Request.
|
|
*
|
|
* @param Request $request A Request instance
|
|
*/
|
|
public function addSurrogateCapability(Request $request)
|
|
{
|
|
$current = $request->headers->get('Surrogate-Capability');
|
|
$new = 'symfony2="ESI/1.0"';
|
|
|
|
$request->headers->set('Surrogate-Capability', $current ? $current.', '.$new : $new);
|
|
}
|
|
|
|
/**
|
|
* Adds ESI/1.0 capability to the given Request.
|
|
*
|
|
* @param Request $request A Request instance
|
|
*
|
|
* @deprecated since version 2.6, to be removed in 3.0. Use addSurrogateCapability() instead
|
|
*/
|
|
public function addSurrogateEsiCapability(Request $request)
|
|
{
|
|
@trigger_error('The '.__METHOD__.' method is deprecated since version 2.6 and will be removed in 3.0. Use the addSurrogateCapability() method instead.', E_USER_DEPRECATED);
|
|
|
|
$this->addSurrogateCapability($request);
|
|
}
|
|
|
|
/**
|
|
* Adds HTTP headers to specify that the Response needs to be parsed for ESI.
|
|
*
|
|
* This method only adds an ESI HTTP header if the Response has some ESI tags.
|
|
*
|
|
* @param Response $response A Response instance
|
|
*/
|
|
public function addSurrogateControl(Response $response)
|
|
{
|
|
if (false !== strpos($response->getContent(), '<esi:include')) {
|
|
$response->headers->set('Surrogate-Control', 'content="ESI/1.0"');
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Checks that the Response needs to be parsed for ESI tags.
|
|
*
|
|
* @param Response $response A Response instance
|
|
*
|
|
* @return bool true if the Response needs to be parsed, false otherwise
|
|
*/
|
|
public function needsParsing(Response $response)
|
|
{
|
|
if (!$control = $response->headers->get('Surrogate-Control')) {
|
|
return false;
|
|
}
|
|
|
|
return (bool) preg_match('#content="[^"]*ESI/1.0[^"]*"#', $control);
|
|
}
|
|
|
|
/**
|
|
* Checks that the Response needs to be parsed for ESI tags.
|
|
*
|
|
* @param Response $response A Response instance
|
|
*
|
|
* @return bool true if the Response needs to be parsed, false otherwise
|
|
*
|
|
* @deprecated since version 2.6, to be removed in 3.0. Use needsParsing() instead
|
|
*/
|
|
public function needsEsiParsing(Response $response)
|
|
{
|
|
@trigger_error('The '.__METHOD__.' method is deprecated since version 2.6 and will be removed in 3.0. Use the needsParsing() method instead.', E_USER_DEPRECATED);
|
|
|
|
return $this->needsParsing($response);
|
|
}
|
|
|
|
/**
|
|
* Renders an ESI tag.
|
|
*
|
|
* @param string $uri A URI
|
|
* @param string $alt An alternate URI
|
|
* @param bool $ignoreErrors Whether to ignore errors or not
|
|
* @param string $comment A comment to add as an esi:include tag
|
|
*
|
|
* @return string
|
|
*/
|
|
public function renderIncludeTag($uri, $alt = null, $ignoreErrors = true, $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;
|
|
}
|
|
|
|
/**
|
|
* Replaces a Response ESI tags with the included resource content.
|
|
*
|
|
* @param Request $request A Request instance
|
|
* @param Response $response A Response instance
|
|
*
|
|
* @return Response
|
|
*/
|
|
public function process(Request $request, Response $response)
|
|
{
|
|
$this->request = $request;
|
|
$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 = array();
|
|
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($options['src'], true),
|
|
var_export(isset($options['alt']) ? $options['alt'] : '', true),
|
|
isset($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);
|
|
$response->headers->set('X-Body-Eval', 'ESI');
|
|
|
|
// remove ESI/1.0 from the Surrogate-Control header
|
|
if ($response->headers->has('Surrogate-Control')) {
|
|
$value = $response->headers->get('Surrogate-Control');
|
|
if ('content="ESI/1.0"' == $value) {
|
|
$response->headers->remove('Surrogate-Control');
|
|
} elseif (preg_match('#,\s*content="ESI/1.0"#', $value)) {
|
|
$response->headers->set('Surrogate-Control', preg_replace('#,\s*content="ESI/1.0"#', '', $value));
|
|
} elseif (preg_match('#content="ESI/1.0",\s*#', $value)) {
|
|
$response->headers->set('Surrogate-Control', preg_replace('#content="ESI/1.0",\s*#', '', $value));
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Handles an ESI from the cache.
|
|
*
|
|
* @param HttpCache $cache An HttpCache instance
|
|
* @param string $uri The main URI
|
|
* @param string $alt An alternative URI
|
|
* @param bool $ignoreErrors Whether to ignore errors or not
|
|
*
|
|
* @return string
|
|
*
|
|
* @throws \RuntimeException
|
|
* @throws \Exception
|
|
*/
|
|
public function handle(HttpCache $cache, $uri, $alt, $ignoreErrors)
|
|
{
|
|
$subRequest = Request::create($uri, 'get', array(), $cache->getRequest()->cookies->all(), array(), $cache->getRequest()->server->all());
|
|
|
|
try {
|
|
$response = $cache->handle($subRequest, HttpKernelInterface::SUB_REQUEST, true);
|
|
|
|
if (!$response->isSuccessful()) {
|
|
throw new \RuntimeException(sprintf('Error when rendering "%s" (Status code is %s).', $subRequest->getUri(), $response->getStatusCode()));
|
|
}
|
|
|
|
return $response->getContent();
|
|
} catch (\Exception $e) {
|
|
if ($alt) {
|
|
return $this->handle($cache, $alt, '', $ignoreErrors);
|
|
}
|
|
|
|
if (!$ignoreErrors) {
|
|
throw $e;
|
|
}
|
|
}
|
|
}
|
|
}
|