TYPO3 v15 dev-main snapshot ()

2026-08-10 22:31:09 +02:00
commit af8cc155b5
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+<?php
+
+declare(strict_types=1);
+
+/*
+ * 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\Core\LinkHandling;
+
+use TYPO3\CMS\Core\Resource\Exception\FileDoesNotExistException;
+use TYPO3\CMS\Core\Resource\FileInterface;
+use TYPO3\CMS\Core\Resource\ResourceFactory;
+use TYPO3\CMS\Core\Resource\Security\FileNameValidator;
+use TYPO3\CMS\Core\Utility\GeneralUtility;
+
+/**
+ * Interface for classes which are transforming a tag link hrefs for folders, in order to
+ * use FAL to store them in database, which means that files can be moved in the fileadmin
+ * without breaking file links in the frontend/backend
+ */
+class FileLinkHandler implements LinkHandlingInterface
+{
+    /**
+     * The Base URN
+     */
+    protected string $baseUrn = 't3://file';
+
+    /**
+     * The resource factory object to resolve file objects
+     */
+    protected ResourceFactory $resourceFactory;
+
+    /**
+     * Returns the link to a file as a string
+     */
+    public function asString(array $parameters): string
+    {
+        if ($parameters['file'] === null) {
+            return '';
+        }
+        $uid = $parameters['file']->getUid();
+        // I am not sure about this use case. Maybe if the file was not indexed and saved to DB (migration from old systems)
+        if ($uid > 0) {
+            $urn = '?uid=' . $uid;
+        } else {
+            $identifier = $parameters['file']->getIdentifier();
+            $urn = '?identifier=' . urlencode($identifier);
+        }
+        if (!empty($parameters['fragment'])) {
+            $urn .= '#' . $parameters['fragment'];
+        }
+        return $this->baseUrn . $urn;
+    }
+
+    /**
+     * Get a file object inside the array data from the string
+     *
+     * @param array $data with the "file" property containing a File object
+     * @throws \TYPO3\CMS\Core\Resource\Exception\FileDoesNotExistException
+     */
+    public function resolveHandlerData(array $data): array
+    {
+        try {
+            $file = $this->resolveFile($data);
+            $fileNameValidator = GeneralUtility::makeInstance(FileNameValidator::class);
+            if ($file !== null && (!$fileNameValidator->isValid(basename($file->getIdentifier()))
+                    || !$fileNameValidator->isValid($file->getName()))
+            ) {
+                $file = null;
+            }
+        } catch (FileDoesNotExistException $e) {
+            $file = null;
+        }
+        $result = ['file' => $file];
+        if (!empty($data['fragment'])) {
+            $result['fragment'] = $data['fragment'];
+        }
+        return $result;
+    }
+
+    /**
+     * @throws FileDoesNotExistException
+     */
+    protected function resolveFile(array $data): ?FileInterface
+    {
+        if (is_numeric($data['uid'] ?? false)) {
+            return $this->getResourceFactory()->getFileObject($data['uid']);
+        }
+        if (is_string($data['identifier'] ?? false) && $data['identifier'] !== '') {
+            return $this->getResourceFactory()->getFileObjectFromCombinedIdentifier($data['identifier']);
+        }
+        return null;
+    }
+
+    /**
+     * Initializes the resource factory (only once)
+     */
+    protected function getResourceFactory(): ResourceFactory
+    {
+        return $this->resourceFactory ??= GeneralUtility::makeInstance(ResourceFactory::class);
+    }
+}