fef2474d4e
* 2.3: bumped Symfony version to 2.3.40 set s-maxage only if all responses are cacheable updated VERSION for 2.3.39 update CONTRIBUTORS for 2.3.39 updated CHANGELOG for 2.3.39 Improved the "branch" row of the PR table Fix typos #18090 1. PHPs session design to PHP's session design 2. Symfony HttpKernel offers to Symfony's HttpKernel offers 3. in which case it it should to in which case it should Fix for Isssue #18091 replace perfom by perform minor #18088 Fix typo for profiler
94 lines
2.8 KiB
PHP
94 lines
2.8 KiB
PHP
<?php
|
|
|
|
/*
|
|
* This file is part of the Symfony package.
|
|
*
|
|
* (c) Fabien Potencier <fabien@symfony.com>
|
|
*
|
|
* This code is partially based on the Rack-Cache library by Ryan Tomayko,
|
|
* which is released under the MIT license.
|
|
* (based on commit 02d2b48d75bcb63cf1c0c7149c077ad256542801)
|
|
*
|
|
* 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\Response;
|
|
|
|
/**
|
|
* ResponseCacheStrategy knows how to compute the Response cache HTTP header
|
|
* based on the different response cache headers.
|
|
*
|
|
* This implementation changes the master response TTL to the smallest TTL received
|
|
* or force validation if one of the surrogates has validation cache strategy.
|
|
*
|
|
* @author Fabien Potencier <fabien@symfony.com>
|
|
*/
|
|
class ResponseCacheStrategy implements ResponseCacheStrategyInterface
|
|
{
|
|
private $cacheable = true;
|
|
private $embeddedResponses = 0;
|
|
private $ttls = array();
|
|
private $maxAges = array();
|
|
private $isNotCacheableResponseEmbedded = false;
|
|
|
|
/**
|
|
* {@inheritdoc}
|
|
*/
|
|
public function add(Response $response)
|
|
{
|
|
if ($response->isValidateable()) {
|
|
$this->cacheable = false;
|
|
} else {
|
|
$maxAge = $response->getMaxAge();
|
|
$this->ttls[] = $response->getTtl();
|
|
$this->maxAges[] = $maxAge;
|
|
|
|
if (null === $maxAge) {
|
|
$this->isNotCacheableResponseEmbedded = true;
|
|
}
|
|
}
|
|
|
|
++$this->embeddedResponses;
|
|
}
|
|
|
|
/**
|
|
* {@inheritdoc}
|
|
*/
|
|
public function update(Response $response)
|
|
{
|
|
// if we have no embedded Response, do nothing
|
|
if (0 === $this->embeddedResponses) {
|
|
return;
|
|
}
|
|
|
|
// Remove validation related headers in order to avoid browsers using
|
|
// their own cache, because some of the response content comes from
|
|
// at least one embedded response (which likely has a different caching strategy).
|
|
if ($response->isValidateable()) {
|
|
$response->setEtag(null);
|
|
$response->setLastModified(null);
|
|
$this->cacheable = false;
|
|
}
|
|
|
|
if (!$this->cacheable) {
|
|
$response->headers->set('Cache-Control', 'no-cache, must-revalidate');
|
|
|
|
return;
|
|
}
|
|
|
|
$this->ttls[] = $response->getTtl();
|
|
$this->maxAges[] = $response->getMaxAge();
|
|
|
|
if ($this->isNotCacheableResponseEmbedded) {
|
|
$response->headers->removeCacheControlDirective('s-maxage');
|
|
} elseif (null !== $maxAge = min($this->maxAges)) {
|
|
$response->setSharedMaxAge($maxAge);
|
|
$response->headers->set('Age', $maxAge - min($this->ttls));
|
|
}
|
|
$response->setMaxAge(0);
|
|
}
|
|
}
|