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<?php
declare(strict_types=1);
/**
* @copyright Copyright (c) 2016, ownCloud, Inc.
*
* @author Lukas Reschke <lukas@statuscode.ch>
*
* @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;
/** @var CsrfToken|null */
private $csrfToken = null;
/**
* @param CsrfTokenGenerator $tokenGenerator
* @param SessionStorage $storageInterface
*/
public function __construct(CsrfTokenGenerator $tokenGenerator,
SessionStorage $storageInterface) {
$this->tokenGenerator = $tokenGenerator;
$this->sessionStorage = $storageInterface;
}
/**
* Returns the current CSRF token, if none set it will create a new one.
*
* @return CsrfToken
*/
public function getToken(): CsrfToken {
if(!\is_null($this->csrfToken)) {
return $this->csrfToken;
}
if($this->sessionStorage->hasToken()) {
$value = $this->sessionStorage->getToken();
} else {
$value = $this->tokenGenerator->generateToken();
$this->sessionStorage->setToken($value);
}
$this->csrfToken = new CsrfToken($value);
return $this->csrfToken;
}
/**
* Invalidates any current token and sets a new one.
*
* @return CsrfToken
*/
public function refreshToken(): CsrfToken {
$value = $this->tokenGenerator->generateToken();
$this->sessionStorage->setToken($value);
$this->csrfToken = new CsrfToken($value);
return $this->csrfToken;
}
/**
* Remove the current token from the storage.
*/
public function removeToken() {
$this->csrfToken = null;
$this->sessionStorage->removeToken();
}
/**
* Verifies whether the provided token is valid.
*
* @param CsrfToken $token
* @return bool
*/
public function isTokenValid(CsrfToken $token): bool {
if(!$this->sessionStorage->hasToken()) {
return false;
}
return hash_equals(
$this->sessionStorage->getToken(),
$token->getDecryptedValue()
);
}
}