FrontendFormProtection.php

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<?php
namespace TYPO3\CMS\Core\FormProtection;

/*
 * This file is part of the TYPO3 CMS project.
 *
 * It is free software; you can redistribute it and/or modify it under
 * the terms of the GNU General Public License, either version 2
 * of the License, or any later version.
 *
 * For the full copyright and license information, please read the
 * LICENSE.txt file that was distributed with this source code.
 *
 * The TYPO3 project - inspiring people to share!
 */

use TYPO3\CMS\Frontend\Authentication\FrontendUserAuthentication;

class FrontendFormProtection extends AbstractFormProtection
{
    protected $frontendUser;

    public function __construct(FrontendUserAuthentication $frontendUser, \Closure $validationFailedCallback = null)
    {
        $this->frontendUser = $frontendUser;
        $this->validationFailedCallback = $validationFailedCallback;
        if (!$this->isAuthorizedFrontendSession()) {
            throw new \TYPO3\CMS\Core\Error\Exception('A front-end form protection may only be instantiated if there is an active front-end session.', 1460975777);
        }
    }

    protected function retrieveSessionToken()
    {
        $this->sessionToken = $this->frontendUser->getSessionData('formProtectionSessionToken');
        if (empty($this->sessionToken)) {
            $this->sessionToken = $this->generateSessionToken();
            $this->persistSessionToken();
        }
        return $this->sessionToken;
    }

    public function persistSessionToken()
    {
        $this->frontendUser->setAndSaveSessionData('formProtectionSessionToken', $this->sessionToken);
    }

    protected function isAuthorizedFrontendSession()
    {
        return !empty($this->frontendUser->user['uid']);
    }
}