1 files changed, 97 insertions, 0 deletions
diff --git a/lib/private/Security/CSRF/CsrfTokenManager.php b/lib/private/Security/CSRF/CsrfTokenManager.php
new file mode 100644
index 00000000000..8d1bf5c0819
--- /dev/null
+++ b/lib/private/Security/CSRF/CsrfTokenManager.php
@@ -0,0 +1,97 @@
+<?php
+/**
+ * @author Lukas Reschke <lukas@owncloud.com>
+ *
+ * @copyright Copyright (c) 2016, ownCloud, Inc.
+ * @license AGPL-3.0
+ *
+ * This code is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License, version 3,
+ * as published by the Free Software Foundation.
+ *
+ * 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, version 3,
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>
+ *
+ */
+
+namespace OC\Security\CSRF;
+
+use OC\Security\CSRF\TokenStorage\SessionStorage;
+
+/**
+ * Class CsrfTokenManager is the manager for all CSRF token related activities.
+ *
+ * @package OC\Security\CSRF
+ */
+class CsrfTokenManager {
+	/** @var CsrfTokenGenerator */
+	private $tokenGenerator;
+	/** @var SessionStorage */
+	private $sessionStorage;
+
+	/**
+	 * @param CsrfTokenGenerator $tokenGenerator
+	 * @param SessionStorage $storageInterface
+	 */
+	public function __construct(CsrfTokenGenerator $tokenGenerator,
+								SessionStorage $storageInterface) {
+		$this->tokenGenerator = $tokenGenerator;
+		$this->sessionStorage = $storageInterface;
+	}
+
+	/**
+	 * Returns the current CSRF token, if none set it will create a new one.
+	 *
+	 * @return CsrfToken
+	 */
+	public function getToken() {
+		if($this->sessionStorage->hasToken()) {
+			$value = $this->sessionStorage->getToken();
+		} else {
+			$value = $this->tokenGenerator->generateToken();
+			$this->sessionStorage->setToken($value);
+		}
+
+		return new CsrfToken($value);
+	}
+
+	/**
+	 * Invalidates any current token and sets a new one.
+	 *
+	 * @return CsrfToken
+	 */
+	public function refreshToken() {
+		$value = $this->tokenGenerator->generateToken();
+		$this->sessionStorage->setToken($value);
+		return new CsrfToken($value);
+	}
+
+	/**
+	 * Remove the current token from the storage.
+	 */
+	public function removeToken() {
+		$this->sessionStorage->removeToken();
+	}
+
+	/**
+	 * Verifies whether the provided token is valid.
+	 *
+	 * @param CsrfToken $token
+	 * @return bool
+	 */
+	public function isTokenValid(CsrfToken $token) {
+		if(!$this->sessionStorage->hasToken()) {
+			return false;
+		}
+
+		return hash_equals(
+			$this->sessionStorage->getToken(),
+			$token->getDecryptedValue()
+		);
+	}
+}