FrontendGroupRestriction.php

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<?php
declare(strict_types = 1);
namespace TYPO3\CMS\Core\Database\Query\Restriction;

/*
 * 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\Database\Query\Expression\CompositeExpression;
use TYPO3\CMS\Core\Database\Query\Expression\ExpressionBuilder;

class FrontendGroupRestriction implements QueryRestrictionInterface
{
    protected $frontendGroupIds;

    public function __construct(array $frontendGroupIds = null)
    {
        $this->frontendGroupIds = $frontendGroupIds === null ? explode(',', $GLOBALS['TSFE']->gr_list) : $frontendGroupIds;
    }

    public function buildExpression(array $queriedTables, ExpressionBuilder $expressionBuilder): CompositeExpression
    {
        $constraints = [];
        foreach ($queriedTables as $tableAlias => $tableName) {
            $groupFieldName = $GLOBALS['TCA'][$tableName]['ctrl']['enablecolumns']['fe_group'] ?? null;
            if (!empty($groupFieldName)) {
                $fieldName = $tableAlias . '.' . $groupFieldName;
                // Allow records where no group access has been configured (field values NULL, 0 or empty string)
                $constraints = [
                    $expressionBuilder->isNull($fieldName),
                    $expressionBuilder->eq($fieldName, $expressionBuilder->literal('')),
                    $expressionBuilder->eq($fieldName, $expressionBuilder->literal('0')),
                ];
                foreach ($this->frontendGroupIds as $frontendGroupId) {
                    $constraints[] = $expressionBuilder->inSet(
                        $fieldName,
                        $expressionBuilder->literal((string)$frontendGroupId)
                    );
                }
            }
        }
        return $expressionBuilder->orX(...$constraints);
    }
}