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<?php
/**
* @copyright Copyright (c) 2017 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;
use OC\Security\Normalizer\IpAddress;
use OC\Security\RateLimiting\Backend\IBackend;
use OC\Security\RateLimiting\Exception\RateLimitExceededException;
use OCP\AppFramework\Utility\ITimeFactory;
use OCP\IRequest;
use OCP\IUser;
use OCP\IUserSession;
class Limiter {
/** @var IBackend */
private $backend;
/** @var ITimeFactory */
private $timeFactory;
/**
* @param IUserSession $userSession
* @param IRequest $request
* @param ITimeFactory $timeFactory
* @param IBackend $backend
*/
public function __construct(IUserSession $userSession,
IRequest $request,
ITimeFactory $timeFactory,
IBackend $backend) {
$this->backend = $backend;
$this->timeFactory = $timeFactory;
}
/**
* @param string $methodIdentifier
* @param string $userIdentifier
* @param int $period
* @param int $limit
* @throws RateLimitExceededException
*/
private function register($methodIdentifier,
$userIdentifier,
$period,
$limit) {
$existingAttempts = $this->backend->getAttempts($methodIdentifier, $userIdentifier, (int)$period);
if ($existingAttempts >= (int)$limit) {
throw new RateLimitExceededException();
}
$this->backend->registerAttempt($methodIdentifier, $userIdentifier, $this->timeFactory->getTime());
}
/**
* Registers attempt for an anonymous request
*
* @param string $identifier
* @param int $anonLimit
* @param int $anonPeriod
* @param string $ip
* @throws RateLimitExceededException
*/
public function registerAnonRequest($identifier,
$anonLimit,
$anonPeriod,
$ip) {
$ipSubnet = (new IpAddress($ip))->getSubnet();
$anonHashIdentifier = hash('sha512', 'anon::' . $identifier . $ipSubnet);
$this->register($identifier, $anonHashIdentifier, $anonPeriod, $anonLimit);
}
/**
* Registers attempt for an authenticated request
*
* @param string $identifier
* @param int $userLimit
* @param int $userPeriod
* @param IUser $user
* @throws RateLimitExceededException
*/
public function registerUserRequest($identifier,
$userLimit,
$userPeriod,
IUser $user) {
$userHashIdentifier = hash('sha512', 'user::' . $identifier . $user->getUID());
$this->register($identifier, $userHashIdentifier, $userPeriod, $userLimit);
}
}
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