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typo3/sysext/frontend/Classes/Aspect/FileMetadataOverlayAspect.php

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+<?php
+namespace TYPO3\CMS\Frontend\Aspect;
+
+/*
+ * 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\Utility\GeneralUtility;
+use TYPO3\CMS\Frontend\Page\PageRepository;
+
+/**
+ * Class FileMetadataTranslationAspect
+ *
+ * We do not have AOP in TYPO3 for now, thus the aspect which
+ * deals with metadata translation is a slot which reacts on a signal
+ * in the Index\MetadataRepository.
+ *
+ * The aspect injects user permissions and mount points into the storage
+ * based on user or group configuration.
+ *
+ * @internal this is a concrete TYPO3 hook implementation and solely used for EXT:frontend and not part of TYPO3's Core API.
+ */
+class FileMetadataOverlayAspect
+{
+    /**
+     * Do translation and workspace overlay
+     *
+     * @param \ArrayObject $data
+     */
+    public function languageAndWorkspaceOverlay(\ArrayObject $data)
+    {
+        // Should only be in Frontend, but not in eID context
+        if (!(TYPO3_REQUESTTYPE & TYPO3_REQUESTTYPE_FE) || isset($_REQUEST['eID'])) {
+            return;
+        }
+        $overlaidMetaData = $data->getArrayCopy();
+        $pageRepository = GeneralUtility::makeInstance(PageRepository::class);
+        $pageRepository->versionOL('sys_file_metadata', $overlaidMetaData);
+        $overlaidMetaData = $pageRepository->getLanguageOverlay(
+            'sys_file_metadata',
+            $overlaidMetaData
+        );
+        if ($overlaidMetaData !== null) {
+            $data->exchangeArray($overlaidMetaData);
+        }
+    }
+}