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File / Folder	Size	Action
.	-
AbstractSurrogate.php	4.642KB	edt ren
Esi.php	3.237KB	edt ren
HttpCache.php	26.846KB	edt ren
ResponseCacheStrategy.php	9.057KB	edt ren
ResponseCacheStrategyIn...	1.03KB	edt ren
Ssi.php	2.528KB	edt ren
Store.php	14.361KB	edt ren
StoreInterface.php	2.176KB	edt ren
SubRequestHandler.php	3.829KB	edt ren
SurrogateInterface.php	2.107KB	edt ren

<?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\Response;

/**
 * ResponseCacheStrategy knows how to compute the Response cache HTTP header
 * based on the different response cache headers.
 *
 * This implementation changes the main 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
{
    /**
     * Cache-Control headers that are sent to the final response if they appear in ANY of the responses.
     */
    private const OVERRIDE_DIRECTIVES = ['private', 'no-cache', 'no-store', 'no-transform', 'must-revalidate', 'proxy-revalidate'];

/**
     * Cache-Control headers that are sent to the final response if they appear in ALL of the responses.
     */
    private const INHERIT_DIRECTIVES = ['public', 'immutable'];

private int $embeddedResponses = 0;
    private bool $isNotCacheableResponseEmbedded = false;
    private int $age = 0;
    private \DateTimeInterface|null|false $lastModified = null;
    private array $flagDirectives = [
        'no-cache' => null,
        'no-store' => null,
        'no-transform' => null,
        'must-revalidate' => null,
        'proxy-revalidate' => null,
        'public' => null,
        'private' => null,
        'immutable' => null,
    ];
    private array $ageDirectives = [
        'max-age' => null,
        's-maxage' => null,
        'expires' => null,
    ];

/**
     * @return void
     */
    public function add(Response $response)
    {
        ++$this->embeddedResponses;

foreach (self::OVERRIDE_DIRECTIVES as $directive) {
            if ($response->headers->hasCacheControlDirective($directive)) {
                $this->flagDirectives[$directive] = true;
            }
        }

foreach (self::INHERIT_DIRECTIVES as $directive) {
            if (false !== $this->flagDirectives[$directive]) {
                $this->flagDirectives[$directive] = $response->headers->hasCacheControlDirective($directive);
            }
        }

$age = $response->getAge();
        $this->age = max($this->age, $age);

if ($this->willMakeFinalResponseUncacheable($response)) {
            $this->isNotCacheableResponseEmbedded = true;

return;
        }

$isHeuristicallyCacheable = $response->headers->hasCacheControlDirective('public');
        $maxAge = $response->headers->hasCacheControlDirective('max-age') ? (int) $response->headers->getCacheControlDirective('max-age') : null;
        $this->storeRelativeAgeDirective('max-age', $maxAge, $age, $isHeuristicallyCacheable);
        $sharedMaxAge = $response->headers->hasCacheControlDirective('s-maxage') ? (int) $response->headers->getCacheControlDirective('s-maxage') : $maxAge;
        $this->storeRelativeAgeDirective('s-maxage', $sharedMaxAge, $age, $isHeuristicallyCacheable);

$expires = $response->getExpires();
        $expires = null !== $expires ? (int) $expires->format('U') - (int) $response->getDate()->format('U') : null;
        $this->storeRelativeAgeDirective('expires', $expires >= 0 ? $expires : null, 0, $isHeuristicallyCacheable);

if (false !== $this->lastModified) {
            $lastModified = $response->getLastModified();
            $this->lastModified = $lastModified ? max($this->lastModified, $lastModified) : false;
        }
    }

/**
     * @return void
     */
    public function update(Response $response)
    {
        // if we have no embedded Response, do nothing
        if (0 === $this->embeddedResponses) {
            return;
        }

// Remove Etag since it cannot be merged from embedded responses.
        $response->setEtag(null);

$this->add($response);

$response->headers->set('Age', $this->age);

if ($this->isNotCacheableResponseEmbedded) {
            $response->setLastModified(null);

if ($this->flagDirectives['no-store']) {
                $response->headers->set('Cache-Control', 'no-cache, no-store, must-revalidate');
            } else {
                $response->headers->set('Cache-Control', 'no-cache, must-revalidate');
            }

return;
        }

$response->setLastModified($this->lastModified ?: null);

$flags = array_filter($this->flagDirectives);

if (isset($flags['must-revalidate'])) {
            $flags['no-cache'] = true;
        }

$response->headers->set('Cache-Control', implode(', ', array_keys($flags)));

$maxAge = null;

if (is_numeric($this->ageDirectives['max-age'])) {
            $maxAge = $this->ageDirectives['max-age'] + $this->age;
            $response->headers->addCacheControlDirective('max-age', $maxAge);
        }

if (is_numeric($this->ageDirectives['s-maxage'])) {
            $sMaxage = $this->ageDirectives['s-maxage'] + $this->age;

if ($maxAge !== $sMaxage) {
                $response->headers->addCacheControlDirective('s-maxage', $sMaxage);
            }
        }

if (is_numeric($this->ageDirectives['expires'])) {
            $date = clone $response->getDate();
            $date = $date->modify('+'.($this->ageDirectives['expires'] + $this->age).' seconds');
            $response->setExpires($date);
        }
    }

/**
     * RFC2616, Section 13.4.
     *
     * @see https://www.w3.org/Protocols/rfc2616/rfc2616-sec13.html#sec13.4
     */
    private function willMakeFinalResponseUncacheable(Response $response): bool
    {
        // RFC2616: A response received with a status code of 200, 203, 300, 301 or 410
        // MAY be stored by a cache […] unless a cache-control directive prohibits caching.
        if ($response->headers->hasCacheControlDirective('no-cache')
            || $response->headers->hasCacheControlDirective('no-store')
        ) {
            return true;
        }

// Etag headers cannot be merged, they render the response uncacheable
        // by default (except if the response also has max-age etc.).
        if (null === $response->getEtag() && \in_array($response->getStatusCode(), [200, 203, 300, 301, 410])) {
            return false;
        }

// RFC2616: A response received with any other status code (e.g. status codes 302 and 307)
        // MUST NOT be returned in a reply to a subsequent request unless there are
        // cache-control directives or another header(s) that explicitly allow it.
        $cacheControl = ['max-age', 's-maxage', 'must-revalidate', 'proxy-revalidate', 'public', 'private'];
        foreach ($cacheControl as $key) {
            if ($response->headers->hasCacheControlDirective($key)) {
                return false;
            }
        }

if ($response->headers->has('Expires')) {
            return false;
        }

return true;
    }

/**
     * Store lowest max-age/s-maxage/expires for the final response.
     *
     * The response might have been stored in cache a while ago. To keep things comparable,
     * we have to subtract the age so that the value is normalized for an age of 0.
     *
     * If the value is lower than the currently stored value, we update the value, to keep a rolling
     * minimal value of each instruction.
     *
     * If the value is NULL and the isHeuristicallyCacheable parameter is false, the directive will
     * not be set on the final response. In this case, not all responses had the directive set and no
     * value can be found that satisfies the requirements of all responses. The directive will be dropped
     * from the final response.
     *
     * If the isHeuristicallyCacheable parameter is true, however, the current response has been marked
     * as cacheable in a public (shared) cache, but did not provide an explicit lifetime that would serve
     * as an upper bound. In this case, we can proceed and possibly keep the directive on the final response.
     */
    private function storeRelativeAgeDirective(string $directive, ?int $value, int $age, bool $isHeuristicallyCacheable): void
    {
        if (null === $value) {
            if ($isHeuristicallyCacheable) {
                /*
                 * See https://datatracker.ietf.org/doc/html/rfc7234#section-4.2.2
                 * This particular response does not require maximum lifetime; heuristics might be applied.
                 * Other responses, however, might have more stringent requirements on maximum lifetime.
                 * So, return early here so that the final response can have the more limiting value set.
                 */
                return;
            }
            $this->ageDirectives[$directive] = false;
        }

if (false !== $this->ageDirectives[$directive]) {
            $value -= $age;
            $this->ageDirectives[$directive] = null !== $this->ageDirectives[$directive] ? min($this->ageDirectives[$directive], $value) : $value;
        }
    }
}