Update

lib/api/file.dart

@@ -0,0 +1,52 @@
+import 'package:json_annotation/json_annotation.dart';
+
+part 'file.g.dart';
+
+@JsonSerializable()
+class EhFileBasic {
+  const EhFileBasic({
+    required this.id,
+    required this.width,
+    required this.height,
+    required this.isOriginal,
+  });
+  final int id;
+  final int width;
+  final int height;
+  @JsonKey(name: 'is_original')
+  final bool isOriginal;
+  factory EhFileBasic.fromJson(Map<String, dynamic> json) =>
+      _$EhFileBasicFromJson(json);
+  Map<String, dynamic> toJson() => _$EhFileBasicToJson(this);
+}
+
+@JsonSerializable()
+class EhFileExtend {
+  const EhFileExtend({
+    required this.id,
+    required this.width,
+    required this.height,
+    required this.isOriginal,
+    required this.token,
+  });
+  final int id;
+  final int width;
+  final int height;
+  @JsonKey(name: 'is_original')
+  final bool isOriginal;
+  final String token;
+  factory EhFileExtend.fromJson(Map<String, dynamic> json) =>
+      _$EhFileExtendFromJson(json);
+  Map<String, dynamic> toJson() => _$EhFileExtendToJson(this);
+}
+
+class EhFiles {
+  const EhFiles({required this.files});
+  final Map<String, EhFileBasic> files;
+  factory EhFiles.fromJson(Map<String, dynamic> json) => EhFiles(
+        files: (json).map(
+          (k, e) =>
+              MapEntry(k, EhFileBasic.fromJson(e as Map<String, dynamic>)),
+        ),
+      );
+}