TYPO3 FAL - Store given metadata in original file instead of reference if it is empty yet

DataHandlerHook.php

<?php

// Located in sitepackage/Classes/Hook/DataHandlerHook.php

declare(strict_types=1);

namespace Acme\AcmeSitepackage\Hook;

use TYPO3\CMS\Core\Database\ConnectionPool;
use TYPO3\CMS\Core\DataHandling\DataHandler;
use TYPO3\CMS\Core\Resource\Exception\FileDoesNotExistException;
use TYPO3\CMS\Core\Resource\Exception\ResourceDoesNotExistException;
use TYPO3\CMS\Core\Resource\ResourceFactory;
use TYPO3\CMS\Core\SingletonInterface;

class DataHandlerHook implements SingletonInterface
{
    public function __construct(
        protected ConnectionPool $connectionPool,
        private readonly ResourceFactory $resourceFactory,
    ) {
    }

    /**
     * @param string $status
     * @param string $table
     * @param string|int $id
     * @param array<string, mixed> $fieldArray
     * @param DataHandler $dataHandler
     * @throws FileDoesNotExistException|ResourceDoesNotExistException
     */
    public function processDatamap_postProcessFieldArray(
        string $status,
        string $table,
        string|int $id,
        array &$fieldArray,
        DataHandler $dataHandler
    ): void {
        // Store given metadata in original file instead if it is empty yet
        if ($table === 'sys_file_reference') {
            if ($status === 'new') {
                $file = $this->resourceFactory->getFileObject($fieldArray['uid_local']);
            } elseif (is_int($id)) {
                $file = $this->resourceFactory->getFileReferenceObject($id)->getOriginalFile();
            } else {
                return;
            }
            $metaDataAspect = $file->getMetaData();
            foreach (['title', 'description', 'alternative', 'copyright'] as $field) {
                if (!empty($fieldArray[$field]) && empty($metaDataAspect->offsetGet($field))) {
                    $metaDataAspect->offsetSet($field, $fieldArray[$field]);
                    $fieldArray[$field] = null;
                }
            }
            $metaDataAspect->save();
        }
    }
}