auth_interceptor.dart

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import 'package:dio/dio.dart';
 
import '../constants/strings.dart';
import '../storage/flutter_secure_storage.dart';
 
class AuthInterceptor extends Interceptor {
  final Dio dio;
 
  AuthInterceptor({required this.dio});
 
  final _tokenSecureStorage = SecureStorage(key: Strings.tokenKey);
  final _sessionSecureStorage = SecureStorage(key: Strings.sessionKey);
 
  @override
  void onRequest(
    RequestOptions options,
    RequestInterceptorHandler handler,
  ) async {
    final token = await _tokenSecureStorage.get();
    if (token != null) {
      options.headers['Authorization'] = 'Bearer $token';
    }
 
    return handler.next(options);
  }
 
  @override
  void onError(
    DioException err,
    ErrorInterceptorHandler handler,
  ) async {
    if (err.response?.statusCode == 401) {
      await _handleTokenExpiration();
    }
    return handler.next(err);
  }
 
  Future<void> _handleTokenExpiration() async {
    await _tokenSecureStorage.delete();
    await _sessionSecureStorage.delete();
  }
}