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<?php
declare(strict_types=1);
/**
* SPDX-FileCopyrightText: 2017 Nextcloud GmbH and Nextcloud contributors
* SPDX-License-Identifier: AGPL-3.0-or-later
*/
namespace OC\Security\RateLimiting\Backend;
use OCP\AppFramework\Utility\ITimeFactory;
use OCP\ICache;
use OCP\ICacheFactory;
use OCP\IConfig;
/**
* Class MemoryCacheBackend uses the configured distributed memory cache for storing
* rate limiting data.
*
* @package OC\Security\RateLimiting\Backend
*/
class MemoryCacheBackend implements IBackend {
private ICache $cache;
public function __construct(
private IConfig $config,
ICacheFactory $cacheFactory,
private ITimeFactory $timeFactory,
) {
$this->cache = $cacheFactory->createDistributed(self::class);
}
private function hash(
string $methodIdentifier,
string $userIdentifier,
): string {
return hash('sha512', $methodIdentifier . $userIdentifier);
}
private function getExistingAttempts(string $identifier): array {
$cachedAttempts = $this->cache->get($identifier);
if ($cachedAttempts === null) {
return [];
}
$cachedAttempts = json_decode($cachedAttempts, true);
if (\is_array($cachedAttempts)) {
return $cachedAttempts;
}
return [];
}
/**
* {@inheritDoc}
*/
public function getAttempts(
string $methodIdentifier,
string $userIdentifier,
): int {
$identifier = $this->hash($methodIdentifier, $userIdentifier);
$existingAttempts = $this->getExistingAttempts($identifier);
$count = 0;
$currentTime = $this->timeFactory->getTime();
foreach ($existingAttempts as $expirationTime) {
if ($expirationTime > $currentTime) {
$count++;
}
}
return $count;
}
/**
* {@inheritDoc}
*/
public function registerAttempt(
string $methodIdentifier,
string $userIdentifier,
int $period,
): void {
$identifier = $this->hash($methodIdentifier, $userIdentifier);
$existingAttempts = $this->getExistingAttempts($identifier);
$currentTime = $this->timeFactory->getTime();
// Unset all attempts that are already expired
foreach ($existingAttempts as $key => $expirationTime) {
if ($expirationTime < $currentTime) {
unset($existingAttempts[$key]);
}
}
$existingAttempts = array_values($existingAttempts);
// Store the new attempt
$existingAttempts[] = (string)($currentTime + $period);
if (!$this->config->getSystemValueBool('ratelimit.protection.enabled', true)) {
return;
}
$this->cache->set($identifier, json_encode($existingAttempts));
}
}
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