Update

lib/api/api_result.dart

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+import 'package:json_annotation/json_annotation.dart';
+
+part 'api_result.g.dart';
+
+@JsonSerializable(genericArgumentFactories: true)
+class ApiResult<T> {
+  const ApiResult({
+    required this.ok,
+    required this.status,
+    this.data,
+    this.error,
+  });
+  factory ApiResult.fromJson(
+          Map<String, dynamic> json, T Function(Object?) fromJsonT) =>
+      _$ApiResultFromJson(json, fromJsonT);
+  final bool ok;
+  final int status;
+  final T? data;
+  final String? error;
+  Map<String, dynamic> toJson(Object? Function(T) toJsonT) =>
+      _$ApiResultToJson(this, toJsonT);
+}

lib/api/api_result.g.dart

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+// GENERATED CODE - DO NOT MODIFY BY HAND
+
+part of 'api_result.dart';
+
+// **************************************************************************
+// JsonSerializableGenerator
+// **************************************************************************
+
+ApiResult<T> _$ApiResultFromJson<T>(
+  Map<String, dynamic> json,
+  T Function(Object? json) fromJsonT,
+) =>
+    ApiResult<T>(
+      ok: json['ok'] as bool,
+      status: json['status'] as int,
+      data: _$nullableGenericFromJson(json['data'], fromJsonT),
+      error: json['error'] as String?,
+    );
+
+Map<String, dynamic> _$ApiResultToJson<T>(
+  ApiResult<T> instance,
+  Object? Function(T value) toJsonT,
+) =>
+    <String, dynamic>{
+      'ok': instance.ok,
+      'status': instance.status,
+      'data': _$nullableGenericToJson(instance.data, toJsonT),
+      'error': instance.error,
+    };
+
+T? _$nullableGenericFromJson<T>(
+  Object? input,
+  T Function(Object? json) fromJson,
+) =>
+    input == null ? null : fromJson(input);
+
+Object? _$nullableGenericToJson<T>(
+  T? input,
+  Object? Function(T value) toJson,
+) =>
+    input == null ? null : toJson(input);

lib/api/client.dart

@@ -0,0 +1,19 @@
+import 'package:dio/dio.dart';
+import 'package:retrofit/retrofit.dart';
+import 'api_result.dart';
+import 'user.dart';
+
+part 'client.g.dart';
+
+@RestApi(parser: Parser.FlutterCompute)
+abstract class EHApi {
+  factory EHApi(Dio dio, {String baseUrl}) = _EHApi;
+
+  @GET('/user')
+  Future<ApiResult<BUser>> getUser();
+  @GET('/user')
+  Future<ApiResult<BUser>> getUserById(@Query("id") int id);
+  @GET('/user')
+  Future<ApiResult<BUser>> getUserByUsername(
+      @Query("username") String username);
+}

lib/api/client.g.dart

@@ -0,0 +1,131 @@
+// GENERATED CODE - DO NOT MODIFY BY HAND
+
+part of 'client.dart';
+
+// **************************************************************************
+// RetrofitGenerator
+// **************************************************************************
+
+// ignore_for_file: unnecessary_brace_in_string_interps,no_leading_underscores_for_local_identifiers
+
+class _EHApi implements EHApi {
+  _EHApi(
+    this._dio, {
+    this.baseUrl,
+  });
+
+  final Dio _dio;
+
+  String? baseUrl;
+
+  @override
+  Future<ApiResult<BUser>> getUser() async {
+    const _extra = <String, dynamic>{};
+    final queryParameters = <String, dynamic>{};
+    final _headers = <String, dynamic>{};
+    final Map<String, dynamic>? _data = null;
+    final _result = await _dio
+        .fetch<Map<String, dynamic>>(_setStreamType<ApiResult<BUser>>(Options(
+      method: 'GET',
+      headers: _headers,
+      extra: _extra,
+    )
+            .compose(
+              _dio.options,
+              '/user',
+              queryParameters: queryParameters,
+              data: _data,
+            )
+            .copyWith(
+                baseUrl: _combineBaseUrls(
+              _dio.options.baseUrl,
+              baseUrl,
+            ))));
+    final value = await compute(deserializeApiResult<BUser>, _result.data!);
+    return value;
+  }
+
+  @override
+  Future<ApiResult<BUser>> getUserById(int id) async {
+    const _extra = <String, dynamic>{};
+    final queryParameters = <String, dynamic>{r'id': id};
+    final _headers = <String, dynamic>{};
+    final Map<String, dynamic>? _data = null;
+    final _result = await _dio
+        .fetch<Map<String, dynamic>>(_setStreamType<ApiResult<BUser>>(Options(
+      method: 'GET',
+      headers: _headers,
+      extra: _extra,
+    )
+            .compose(
+              _dio.options,
+              '/user',
+              queryParameters: queryParameters,
+              data: _data,
+            )
+            .copyWith(
+                baseUrl: _combineBaseUrls(
+              _dio.options.baseUrl,
+              baseUrl,
+            ))));
+    final value = await compute(deserializeApiResult<BUser>, _result.data!);
+    return value;
+  }
+
+  @override
+  Future<ApiResult<BUser>> getUserByUsername(String username) async {
+    const _extra = <String, dynamic>{};
+    final queryParameters = <String, dynamic>{r'username': username};
+    final _headers = <String, dynamic>{};
+    final Map<String, dynamic>? _data = null;
+    final _result = await _dio
+        .fetch<Map<String, dynamic>>(_setStreamType<ApiResult<BUser>>(Options(
+      method: 'GET',
+      headers: _headers,
+      extra: _extra,
+    )
+            .compose(
+              _dio.options,
+              '/user',
+              queryParameters: queryParameters,
+              data: _data,
+            )
+            .copyWith(
+                baseUrl: _combineBaseUrls(
+              _dio.options.baseUrl,
+              baseUrl,
+            ))));
+    final value = await compute(deserializeApiResult<BUser>, _result.data!);
+    return value;
+  }
+
+  RequestOptions _setStreamType<T>(RequestOptions requestOptions) {
+    if (T != dynamic &&
+        !(requestOptions.responseType == ResponseType.bytes ||
+            requestOptions.responseType == ResponseType.stream)) {
+      if (T == String) {
+        requestOptions.responseType = ResponseType.plain;
+      } else {
+        requestOptions.responseType = ResponseType.json;
+      }
+    }
+    return requestOptions;
+  }
+
+  String _combineBaseUrls(
+    String dioBaseUrl,
+    String? baseUrl,
+  ) {
+    if (baseUrl == null || baseUrl.trim().isEmpty) {
+      return dioBaseUrl;
+    }
+
+    final url = Uri.parse(baseUrl);
+
+    if (url.isAbsolute) {
+      return url.toString();
+    }
+
+    return Uri.parse(dioBaseUrl).resolveUri(url).toString();
+  }
+}

lib/api/user.dart

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+import 'package:json_annotation/json_annotation.dart';
+
+part 'user.g.dart';
+
+@JsonEnum(valueField: 'code')
+enum UserPermission {
+  none(0),
+  readGallery(1),
+  editGallery(2),
+  all(3);
+
+  const UserPermission(this.code);
+  final int code;
+}
+
+@JsonSerializable()
+class BUser {
+  const BUser({
+    required this.id,
+    required this.username,
+    required this.is_admin,
+    required this.permissions,
+  });
+  final int id;
+  final String username;
+  final bool is_admin;
+  final UserPermission permissions;
+  factory BUser.fromJson(Map<String, dynamic> json) => _$BUserFromJson(json);
+  Map<String, dynamic> toJson() => _$BUserToJson(this);
+}

lib/api/user.g.dart

@@ -0,0 +1,28 @@
+// GENERATED CODE - DO NOT MODIFY BY HAND
+
+part of 'user.dart';
+
+// **************************************************************************
+// JsonSerializableGenerator
+// **************************************************************************
+
+BUser _$BUserFromJson(Map<String, dynamic> json) => BUser(
+      id: json['id'] as int,
+      username: json['username'] as String,
+      is_admin: json['is_admin'] as bool,
+      permissions: $enumDecode(_$UserPermissionEnumMap, json['permissions']),
+    );
+
+Map<String, dynamic> _$BUserToJson(BUser instance) => <String, dynamic>{
+      'id': instance.id,
+      'username': instance.username,
+      'is_admin': instance.is_admin,
+      'permissions': _$UserPermissionEnumMap[instance.permissions]!,
+    };
+
+const _$UserPermissionEnumMap = {
+  UserPermission.none: 0,
+  UserPermission.readGallery: 1,
+  UserPermission.editGallery: 2,
+  UserPermission.all: 3,
+};