CategoryPermissionsAspect.php

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<?php
 
/*
 * 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!
 */
 
namespace ‪TYPO3\CMS\Backend\Security;
 
use ‪TYPO3\CMS\Backend\Tree\TreeNode;
use ‪TYPO3\CMS\Backend\Tree\TreeNodeCollection;
use ‪TYPO3\CMS\Core\Authentication\BackendUserAuthentication;
use ‪TYPO3\CMS\Core\Database\ConnectionPool;
use ‪TYPO3\CMS\Core\Tree\Event\ModifyTreeDataEvent;
use ‪TYPO3\CMS\Core\Utility\GeneralUtility;
 
final class ‪CategoryPermissionsAspect
{
    private ‪$categoryTableName = 'sys_category';
 
    private ‪$backendUserAuthentication;
 
    public function ‪__construct(‪$backendUserAuthentication = null)
    {
        $this->backendUserAuthentication = ‪$backendUserAuthentication ?: ‪$GLOBALS['BE_USER'];
    }
 
    public function ‪addUserPermissionsToCategoryTreeData(‪ModifyTreeDataEvent $event): void
    {
        // Only evaluate this in the backend
        if (!(TYPO3_REQUESTTYPE & TYPO3_REQUESTTYPE_BE)) {
            return;
        }
 
        $dataProvider = $event->‪getProvider();
        $treeData = $event->‪getTreeData();
 
        if (!$this->backendUserAuthentication->isAdmin() && $dataProvider->getTableName() === $this->categoryTableName) {
 
            // Get User permissions related to category
            $categoryMountPoints = $this->backendUserAuthentication->getCategoryMountPoints();
 
            // Backup child nodes to be processed.
            $treeNodeCollection = $treeData->getChildNodes();
 
            if (!empty($categoryMountPoints) && !empty($treeNodeCollection)) {
 
                // Check the rootline against categoryMountPoints when tree was filtered
                if ($dataProvider->getRootUid() !== null) {
                    if (in_array($dataProvider->getRootUid(), $categoryMountPoints)) {
                        return;
                    }
                    $uidsInRootline = $this->‪findUidsInRootline($dataProvider->getRootUid());
                    if (!empty(array_intersect($categoryMountPoints, $uidsInRootline))) {
                        // One of the parents was found in categoryMountPoints so all children are secure
                        return;
                    }
                }
 
                // First, remove all child nodes which must be analyzed to be considered as "secure".
                // The nodes were backed up in variable $treeNodeCollection beforehand.
                $treeData->removeChildNodes();
 
                // Create an empty tree node collection to receive the secured nodes.
                $securedTreeNodeCollection = GeneralUtility::makeInstance(TreeNodeCollection::class);
 
                foreach ($categoryMountPoints as $categoryMountPoint) {
                    $treeNode = $this->‪lookUpCategoryMountPointInTreeNodes((int)$categoryMountPoint, $treeNodeCollection);
                    if ($treeNode !== null) {
                        $securedTreeNodeCollection->append($treeNode);
                    }
                }
 
                // Reset child nodes.
                $treeData->setChildNodes($securedTreeNodeCollection);
            }
        }
    }
 
    private function ‪lookUpCategoryMountPointInTreeNodes($categoryMountPoint, ‪TreeNodeCollection $treeNodeCollection)
    {
        $result = null;
 
        // If any User permission, recursively traverse the tree and set tree part as mount point
        foreach ($treeNodeCollection as $treeNode) {
 
            if ((int)$treeNode->getId() === $categoryMountPoint) {
                $result = $treeNode;
                break;
            }
 
            if ($treeNode->hasChildNodes()) {
 
                $node = $this->‪lookUpCategoryMountPointInTreeNodes($categoryMountPoint, $treeNode->getChildNodes());
                if ($node !== null) {
                    $result = $node;
                    break;
                }
            }
        }
        return $result;
    }
 
    private function ‪findUidsInRootline($uid)
    {
        $queryBuilder = GeneralUtility::makeInstance(ConnectionPool::class)
            ->getQueryBuilderForTable($this->categoryTableName);
        $row = $queryBuilder
            ->select('parent')
            ->from($this->categoryTableName)
            ->where(
                $queryBuilder->expr()->eq('uid', $queryBuilder->createNamedParameter($uid, \PDO::PARAM_INT))
            )
            ->execute()
            ->fetch();
 
        $parentUids = [];
        if ($row['parent'] > 0) {
            $parentUids = $this->‪findUidsInRootline($row['parent']);
            $parentUids[] = $row['parent'];
        }
        return $parentUids;
    }
}