AbstractRequestRateLimiter.php
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<?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\HttpFoundation\RateLimiter;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\RateLimiter\LimiterInterface;
use Symfony\Component\RateLimiter\Policy\NoLimiter;
use Symfony\Component\RateLimiter\RateLimit;
/**
* An implementation of RequestRateLimiterInterface that
* fits most use-cases.
*
* @author Wouter de Jong <wouter@wouterj.nl>
*/
abstract class AbstractRequestRateLimiter implements RequestRateLimiterInterface
{
public function consume(Request $request): RateLimit
{
$limiters = $this->getLimiters($request);
if (0 === \count($limiters)) {
$limiters = [new NoLimiter()];
}
$minimalRateLimit = null;
foreach ($limiters as $limiter) {
$rateLimit = $limiter->consume(1);
$minimalRateLimit = $minimalRateLimit ? self::getMinimalRateLimit($minimalRateLimit, $rateLimit) : $rateLimit;
}
return $minimalRateLimit;
}
public function reset(Request $request): void
{
foreach ($this->getLimiters($request) as $limiter) {
$limiter->reset();
}
}
/**
* @return LimiterInterface[] a set of limiters using keys extracted from the request
*/
abstract protected function getLimiters(Request $request): array;
private static function getMinimalRateLimit(RateLimit $first, RateLimit $second): RateLimit
{
if ($first->isAccepted() !== $second->isAccepted()) {
return $first->isAccepted() ? $second : $first;
}
$firstRemainingTokens = $first->getRemainingTokens();
$secondRemainingTokens = $second->getRemainingTokens();
if ($firstRemainingTokens === $secondRemainingTokens) {
return $first->getRetryAfter() < $second->getRetryAfter() ? $second : $first;
}
return $firstRemainingTokens > $secondRemainingTokens ? $second : $first;
}
}