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typo3/sysext/adminpanel/Classes/Repositories/FrontendGroupsRepository.php

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+<?php
+declare(strict_types = 1);
+
+namespace TYPO3\CMS\Adminpanel\Repositories;
+
+/*
+ * 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\Backend\FrontendBackendUserAuthentication;
+use TYPO3\CMS\Core\Database\ConnectionPool;
+use TYPO3\CMS\Core\Database\Query\Restriction\DeletedRestriction;
+use TYPO3\CMS\Core\Type\Bitmask\Permission;
+use TYPO3\CMS\Core\Utility\GeneralUtility;
+
+/**
+ * Admin Panel Frontend Groups Repository
+ *
+ * @internal
+ */
+class FrontendGroupsRepository
+{
+    /**
+     * returns an array of all available frontend user groups including hidden ones.
+     *
+     * @return array
+     */
+    public function getAvailableFrontendUserGroups(): array
+    {
+        $optionCount = $this->getUserGroupOptionCountByBackendUser($this->getBackendUser());
+
+        $frontendGroups = [];
+        if ($optionCount > 0) {
+            $frontendGroups = $this->getUserGroupsForPagesByBackendUser($this->getBackendUser());
+        }
+
+        return $frontendGroups;
+    }
+
+    /**
+     * fetches the amount of user groups
+     *
+     * @param FrontendBackendUserAuthentication $beUser
+     * @return int
+     */
+    protected function getUserGroupOptionCountByBackendUser(FrontendBackendUserAuthentication $beUser): int
+    {
+        $queryBuilder = GeneralUtility::makeInstance(ConnectionPool::class)
+            ->getQueryBuilderForTable('fe_groups');
+
+        $queryBuilder->getRestrictions()
+            ->removeAll()
+            ->add(GeneralUtility::makeInstance(DeletedRestriction::class));
+
+        $optionCount = $queryBuilder->count('fe_groups.uid')
+            ->from('fe_groups', 'fe_groups')
+            ->innerJoin(
+                'fe_groups',
+                'pages',
+                'pages',
+                $queryBuilder->expr()->eq('pages.uid', $queryBuilder->quoteIdentifier('fe_groups.pid'))
+            )
+            ->where(
+                $beUser->getPagePermsClause(Permission::PAGE_SHOW)
+            )
+            ->execute()
+            ->fetchColumn(0);
+
+        return (int)$optionCount;
+    }
+
+    /**
+     * fetches all frontend user groups, except deleted, for pages
+     *
+     * @param FrontendBackendUserAuthentication $beUser
+     * @return array
+     */
+    protected function getUserGroupsForPagesByBackendUser(FrontendBackendUserAuthentication $beUser): array
+    {
+        $queryBuilder = GeneralUtility::makeInstance(ConnectionPool::class)
+            ->getQueryBuilderForTable('fe_groups');
+
+        $queryBuilder->getRestrictions()
+            ->removeAll()
+            ->add(GeneralUtility::makeInstance(DeletedRestriction::class));
+
+        return $queryBuilder->select('fe_groups.uid', 'fe_groups.title')
+            ->from('fe_groups')
+            ->innerJoin(
+                'fe_groups',
+                'pages',
+                'pages',
+                $queryBuilder->expr()->eq('pages.uid', $queryBuilder->quoteIdentifier('fe_groups.pid'))
+            )
+            ->where(
+                $beUser->getPagePermsClause(Permission::PAGE_SHOW)
+            )
+            ->orderBy('fe_groups.title')
+            ->execute()
+            ->fetchAll();
+    }
+
+    /**
+     * Returns the current BE user.
+     *
+     * @return FrontendBackendUserAuthentication
+     */
+    protected function getBackendUser(): FrontendBackendUserAuthentication
+    {
+        return $GLOBALS['BE_USER'];
+    }
+}