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<?php
declare(strict_types=1);
/**
* SPDX-FileCopyrightText: 2021 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\DB\Exception;
use OCP\DB\QueryBuilder\IQueryBuilder;
use OCP\IConfig;
use OCP\IDBConnection;
class DatabaseBackend implements IBackend {
private const TABLE_NAME = 'ratelimit_entries';
public function __construct(
private IConfig $config,
private IDBConnection $dbConnection,
private ITimeFactory $timeFactory,
) {
}
private function hash(
string $methodIdentifier,
string $userIdentifier,
): string {
return hash('sha512', $methodIdentifier . $userIdentifier);
}
/**
* @throws Exception
*/
private function getExistingAttemptCount(
string $identifier,
): int {
$currentTime = $this->timeFactory->getDateTime();
$qb = $this->dbConnection->getQueryBuilder();
$qb->delete(self::TABLE_NAME)
->where(
$qb->expr()->lte('delete_after', $qb->createNamedParameter($currentTime, IQueryBuilder::PARAM_DATETIME_MUTABLE))
)
->executeStatement();
$qb = $this->dbConnection->getQueryBuilder();
$qb->select($qb->func()->count())
->from(self::TABLE_NAME)
->where(
$qb->expr()->eq('hash', $qb->createNamedParameter($identifier, IQueryBuilder::PARAM_STR))
);
$cursor = $qb->executeQuery();
$row = $cursor->fetchOne();
$cursor->closeCursor();
return (int)$row;
}
/**
* {@inheritDoc}
*/
public function getAttempts(
string $methodIdentifier,
string $userIdentifier,
): int {
$identifier = $this->hash($methodIdentifier, $userIdentifier);
return $this->getExistingAttemptCount($identifier);
}
/**
* {@inheritDoc}
*/
public function registerAttempt(
string $methodIdentifier,
string $userIdentifier,
int $period,
): void {
$identifier = $this->hash($methodIdentifier, $userIdentifier);
$deleteAfter = $this->timeFactory->getDateTime()->add(new \DateInterval("PT{$period}S"));
$qb = $this->dbConnection->getQueryBuilder();
$qb->insert(self::TABLE_NAME)
->values([
'hash' => $qb->createNamedParameter($identifier, IQueryBuilder::PARAM_STR),
'delete_after' => $qb->createNamedParameter($deleteAfter, IQueryBuilder::PARAM_DATETIME_MUTABLE),
]);
if (!$this->config->getSystemValueBool('ratelimit.protection.enabled', true)) {
return;
}
$qb->executeStatement();
}
}
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