Condition.php

<?php
namespace My\Site\Userfunc;

/**
 * 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 Condition {

	/**
	 * Custom condition to check if access to the page is restricted by a frontend group (or "Show on any login")
	 *
	 * 	Usage in TypoScript:
	 *	[userFunc = My\Site\Userfunc\Condition::pageHasAccessRestriction()]
	 *
	 * @return bool
	 */
	public function pageHasAccessRestriction() {
		$rootLine = $GLOBALS['TSFE']->rootLine;
		foreach ($rootLine as $pageInRootLine) {
			if (array_key_exists('fe_group', $pageInRootLine) && !empty($pageInRootLine['fe_group'])) {
				// A fe_group is set (field is empty if no fe_group is set)
				if ($pageInRootLine['uid'] === $GLOBALS['TSFE']->id) {
					// We are on the current page, therefore this is an access protected page
					return TRUE;
				} else {
					if ((bool)$pageInRootLine['extendToSubpages']) {
						// Since we are not on the current page, we need to check if the page in the root line
						// has extendToSubpages set and therefore the current page is access protected
						return TRUE;
					}
				}
			}
		}
		return FALSE;
	}

}