AjaxWidgetContextHolder.php

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<?php
namespace TYPO3\CMS\Fluid\Core\Widget;

/*
 * This script is backported from the TYPO3 Flow package "TYPO3.Fluid".   *
 *                                                                        *
 * It is free software; you can redistribute it and/or modify it under    *
 * the terms of the GNU Lesser General Public License, either version 3   *
 *  of the License, or (at your option) any later version.                *
 *                                                                        *
 *                                                                        *
 * This script is distributed in the hope that it will be useful, but     *
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHAN-    *
 * TABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser       *
 * General Public License for more details.                               *
 *                                                                        *
 * You should have received a copy of the GNU Lesser General Public       *
 * License along with the script.                                         *
 * If not, see http://www.gnu.org/licenses/lgpl.html                      *
 *                                                                        *
 * The TYPO3 project - inspiring people to share!                         *
 *                                                                        */
class AjaxWidgetContextHolder implements \TYPO3\CMS\Core\SingletonInterface
{
    protected $widgetContexts = [];

    protected $widgetContextsStorageKey = 'TYPO3\\CMS\\Fluid\\Core\\Widget\\AjaxWidgetContextHolder_widgetContexts';

    public function __construct()
    {
        $this->loadWidgetContexts();
    }

    protected function loadWidgetContexts()
    {
        if (TYPO3_MODE === 'FE') {
            $this->widgetContexts = unserialize($GLOBALS['TSFE']->fe_user->getKey('ses', $this->widgetContextsStorageKey));
        } else {
            $this->widgetContexts = unserialize($GLOBALS['BE_USER']->uc[$this->widgetContextsStorageKey]);
            $GLOBALS['BE_USER']->writeUC();
        }
    }

    public function get($ajaxWidgetId)
    {
        if (!isset($this->widgetContexts[$ajaxWidgetId])) {
            throw new \TYPO3\CMS\Fluid\Core\Widget\Exception\WidgetContextNotFoundException('No widget context was found for the Ajax Widget Identifier "' . $ajaxWidgetId . '". This only happens if AJAX URIs are called without including the widget on a page.', 1284793775);
        }
        return $this->widgetContexts[$ajaxWidgetId];
    }

    public function store(\TYPO3\CMS\Fluid\Core\Widget\WidgetContext $widgetContext)
    {
        $ajaxWidgetId = md5(uniqid(mt_rand(), true));
        $widgetContext->setAjaxWidgetIdentifier($ajaxWidgetId);
        $this->widgetContexts[$ajaxWidgetId] = $widgetContext;
        $this->storeWidgetContexts();
    }

    protected function storeWidgetContexts()
    {
        if (TYPO3_MODE === 'FE') {
            $GLOBALS['TSFE']->fe_user->setKey('ses', $this->widgetContextsStorageKey, serialize($this->widgetContexts));
            $GLOBALS['TSFE']->fe_user->storeSessionData();
        } else {
            $GLOBALS['BE_USER']->uc[$this->widgetContextsStorageKey] = serialize($this->widgetContexts);
            $GLOBALS['BE_USER']->writeUc();
        }
    }
}