SessionUtility.php

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<?php
namespace TYPO3\CMS\Form\Utility;

/*
 * 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\Core\SingletonInterface;
use TYPO3\CMS\Core\Utility\GeneralUtility;
use TYPO3\CMS\Frontend\Controller\TypoScriptFrontendController;

class SessionUtility implements SingletonInterface
{
    protected $sessionData = [];

    protected $formPrefix = '';

    protected $frontendController;

    public function __construct()
    {
        $this->frontendController = $GLOBALS['TSFE'];
    }

    public function initSession($formPrefix = '')
    {
        $this->setFormPrefix($formPrefix);
        if ($this->frontendController->loginUser) {
            $this->sessionData = $this->frontendController->fe_user->getKey('user', $this->formPrefix);
        } else {
            $this->sessionData = $this->frontendController->fe_user->getKey('ses', $this->formPrefix);
        }
    }

    public function storeSession()
    {
        if ($this->frontendController->loginUser) {
            $this->frontendController->fe_user->setKey('user', $this->formPrefix, $this->getSessionData());
        } else {
            $this->frontendController->fe_user->setKey('ses', $this->formPrefix, $this->getSessionData());
        }
        $this->frontendController->storeSessionData();
    }

    public function destroySession()
    {
        $this->removeFiles();
        if ($this->frontendController->loginUser) {
            $this->frontendController->fe_user->setKey('user', $this->formPrefix, null);
        } else {
            $this->frontendController->fe_user->setKey('ses', $this->formPrefix, null);
        }
        $this->frontendController->storeSessionData();
    }

    public function setSessionData($key, $value)
    {
        $this->sessionData[$key] = $value;
    }

    public function getSessionData($key = null, $default = null)
    {
        if ($key === null) {
            return $this->sessionData;
        }
        return isset($this->sessionData[$key]) ? $this->sessionData[$key] : $default;
    }

    public function setFormPrefix($formPrefix)
    {
        $this->formPrefix = $formPrefix;
    }

    protected function removeFiles()
    {
        $sessionData = $this->getSessionData();
        if (is_array($sessionData)) {
            foreach ($sessionData as $fieldName => $values) {
                if (is_array($values)) {
                    foreach ($values as $file) {
                        if (isset($file['tempFilename'])) {
                            GeneralUtility::unlink_tempfile($file['tempFilename']);
                        }
                    }
                }
            }
        }
    }
}