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lib/util/jellyfin_extension.dart

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+import 'dart:convert';
+import 'dart:typed_data';
+
+import 'package:chopper/chopper.dart';
+import 'package:fladder/jellyfin/jellyfin_open_api.swagger.dart';
+
+extension JellyApiExtension on JellyfinOpenApi {
+  Future<Response<dynamic>?> itemIdImagesImageTypePost(
+    ImageType type,
+    String itemId,
+    Uint8List data,
+  ) async {
+    final client = this.client;
+    final uri = Uri.parse('/Items/$itemId/Images/${type.value}');
+    final response = await client.send(
+      Request(
+        'POST',
+        uri,
+        this.client.baseUrl,
+        body: base64Encode(data),
+        headers: {
+          'Content-Type': 'image/*',
+        },
+      ),
+    );
+    return response;
+  }
+}