refactor file drop widget

src/Bundle/ChillDocStoreBundle/Form/DataTransformer/StoredObjectDataTransformer.php

@@ -0,0 +1,52 @@
+<?php
+
+declare(strict_types=1);
+
+/*
+ * Chill is a software for social workers
+ *
+ * For the full copyright and license information, please view
+ * the LICENSE file that was distributed with this source code.
+ */
+
+namespace Chill\DocStoreBundle\Form\DataTransformer;
+
+use Chill\DocStoreBundle\Entity\StoredObject;
+use Chill\DocStoreBundle\Serializer\Normalizer\StoredObjectNormalizer;
+use Symfony\Component\Form\DataTransformerInterface;
+use Symfony\Component\Form\Exception\UnexpectedTypeException;
+use Symfony\Component\Serializer\SerializerInterface;
+
+class StoredObjectDataTransformer implements DataTransformerInterface
+{
+    public function __construct(
+        private SerializerInterface $serializer
+    ) {
+    }
+
+    public function transform(mixed $value): mixed
+    {
+        if (null === $value) {
+            return '';
+        }
+
+        if ($value instanceof StoredObject) {
+            return $this->serializer->serialize($value, 'json', [
+                'groups' => [
+                    StoredObjectNormalizer::ADD_DAV_EDIT_LINK_CONTEXT,
+                ],
+            ]);
+        }
+
+        throw new UnexpectedTypeException($value, StoredObject::class);
+    }
+
+    public function reverseTransform(mixed $value): mixed
+    {
+        if ('' === $value || null === $value) {
+            return null;
+        }
+
+        return json_decode($value, true, 10, JSON_THROW_ON_ERROR);
+    }
+}