1 files changed, 106 insertions, 0 deletions
diff --git a/lib/private/Security/RateLimiting/Limiter.php b/lib/private/Security/RateLimiting/Limiter.php
new file mode 100644
index 00000000000..5c084eb934b
--- /dev/null
+++ b/lib/private/Security/RateLimiting/Limiter.php
@@ -0,0 +1,106 @@
+<?php
+/**
+ * @copyright Copyright (c) 2017 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);
+	}
+}