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<?php
declare(strict_types=1);
/**
* @copyright Copyright (c) 2021 Lukas Reschke <lukas@statuscode.ch>
*
* @author Lukas Reschke <lukas@statuscode.ch>
*
* @license GNU AGPL version 3 or any later version
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
namespace OC\Security\RateLimiting\Backend;
use OCP\AppFramework\Utility\ITimeFactory;
use OCP\DB\QueryBuilder\IQueryBuilder;
use OCP\IDBConnection;
class DatabaseBackend implements IBackend {
private const TABLE_NAME = 'ratelimit_entries';
/** @var IDBConnection */
private $dbConnection;
/** @var ITimeFactory */
private $timeFactory;
/**
* @param IDBConnection $dbConnection
* @param ITimeFactory $timeFactory
*/
public function __construct(
IDBConnection $dbConnection,
ITimeFactory $timeFactory
) {
$this->dbConnection = $dbConnection;
$this->timeFactory = $timeFactory;
}
/**
* @param string $methodIdentifier
* @param string $userIdentifier
* @return string
*/
private function hash(string $methodIdentifier,
string $userIdentifier): string {
return hash('sha512', $methodIdentifier . $userIdentifier);
}
/**
* @param string $identifier
* @param int $seconds
* @return int
* @throws \OCP\DB\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->createParameter('currentTime'))
)
->setParameter('currentTime', $currentTime, 'datetime')
->executeStatement();
$qb = $this->dbConnection->getQueryBuilder();
$qb->selectAlias($qb->createFunction('COUNT(*)'), 'count')
->from(self::TABLE_NAME)
->where(
$qb->expr()->eq('hash', $qb->createNamedParameter($identifier, IQueryBuilder::PARAM_STR))
)
->andWhere(
$qb->expr()->gte('delete_after', $qb->createParameter('currentTime'))
)
->setParameter('currentTime', $currentTime, 'datetime');
$cursor = $qb->executeQuery();
$row = $cursor->fetch();
$cursor->closeCursor();
return (int)$row['count'];
}
/**
* {@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) {
$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_DATE),
])
->executeStatement();
}
}
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