131 lines
4.5 KiB
Dart
131 lines
4.5 KiB
Dart
import 'package:dio/dio.dart';
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import 'package:flutter/foundation.dart';
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import 'package:flutter_secure_storage/flutter_secure_storage.dart';
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import 'package:miaoji_zhang/shared/api/backend_identity.dart';
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import 'package:miaoji_zhang/shared/services/session_store.dart';
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enum BackendAvailability { unknown, online, offline }
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class ApiClient {
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ApiClient._();
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static final ApiClient instance = ApiClient._();
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static const _storage = FlutterSecureStorage();
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static const _legacyTokenKey = 'auth_token';
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static final _tokenKey = 'auth_token_${BackendIdentity.scope}';
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static final sessionExpired = ValueNotifier<int>(0);
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static final availability = ValueNotifier<BackendAvailability>(
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BackendAvailability.unknown,
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);
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static bool _handlingUnauthorized = false;
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static const String baseUrl = BackendIdentity.baseUrl;
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static bool get isInternalBuild => BackendIdentity.internalBuild;
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late final Dio dio = _createDio();
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Dio _createDio() {
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final client =
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Dio(
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BaseOptions(
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baseUrl: baseUrl,
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connectTimeout: const Duration(seconds: 10),
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receiveTimeout: const Duration(seconds: 120),
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),
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)
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..interceptors.add(
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InterceptorsWrapper(
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onResponse: (response, handler) {
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availability.value = BackendAvailability.online;
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handler.next(response);
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},
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onRequest: (options, handler) async {
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final token = await _storage.read(key: _tokenKey);
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if (token != null) {
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options.headers['Authorization'] = 'Bearer $token';
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}
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handler.next(options);
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},
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onError: (error, handler) async {
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if (isConnectivityError(error)) {
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availability.value = BackendAvailability.offline;
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} else if (error.response != null) {
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availability.value = BackendAvailability.online;
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}
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final unauthorized = error.response?.statusCode == 401;
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final data = error.response?.data;
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final aiDenied =
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error.response?.statusCode == 403 &&
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data is Map &&
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data['code'] == 'AI_PERMISSION_DENIED';
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if (aiDenied) {
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await SessionStore.instance.setAiEnabled(false);
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}
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final isAuthRequest = error.requestOptions.path.startsWith(
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'/api/auth/',
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);
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if (unauthorized && !isAuthRequest && !_handlingUnauthorized) {
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_handlingUnauthorized = true;
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await SessionStore.instance.markNeedsReauth();
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sessionExpired.value++;
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Future<void>.delayed(
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const Duration(seconds: 1),
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() => _handlingUnauthorized = false,
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);
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}
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handler.next(error);
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},
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),
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);
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return client;
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}
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Future<void> saveToken(String token) async {
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await _storage.write(key: _tokenKey, value: token);
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await _storage.delete(key: _legacyTokenKey);
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}
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Future<String?> readToken() => _storage.read(key: _tokenKey);
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Future<void> probe() async {
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try {
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await dio.get<void>(
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'/api/public/brand',
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options: Options(receiveTimeout: const Duration(seconds: 10)),
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);
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} catch (_) {
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// The interceptor owns the reachability state transition.
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}
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}
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Future<void> clearToken() async {
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await _storage.delete(key: _tokenKey);
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await _storage.delete(key: _legacyTokenKey);
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}
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}
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bool isConnectivityError(Object error) =>
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error is DioException &&
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(error.type == DioExceptionType.connectionTimeout ||
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error.type == DioExceptionType.connectionError ||
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error.type == DioExceptionType.receiveTimeout ||
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error.type == DioExceptionType.sendTimeout);
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String apiErrorMessage(Object e) {
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if (e is OnlineFeatureRequiredException) return e.message;
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if (e is StateError) return e.message;
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if (e is DioException) {
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final data = e.response?.data;
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if (data is Map && data['message'] != null) {
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return data['message'] as String;
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}
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if (e.type == DioExceptionType.connectionTimeout ||
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e.type == DioExceptionType.connectionError ||
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e.type == DioExceptionType.receiveTimeout) {
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return '无法连接服务器，请检查网络';
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}
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}
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return '出错了，请稍后再试';
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}
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