IfAuthenticatedViewHelper.php

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<?php
namespace TYPO3\CMS\Fluid\ViewHelpers\Be\Security;

/*
 * 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!
 */

class IfAuthenticatedViewHelper extends \TYPO3\CMS\Fluid\Core\ViewHelper\AbstractConditionViewHelper
{
    protected static function evaluateCondition($arguments = null)
    {
        return isset($GLOBALS['BE_USER']) && $GLOBALS['BE_USER']->user['uid'] > 0;
    }

    public function render()
    {
        if (static::evaluateCondition($this->arguments)) {
            return $this->renderThenChild();
        }
        return $this->renderElseChild();
    }
}