together_mobile/lib/request/server.dart

import 'package:dio/dio.dart';
import 'package:flutter_dotenv/flutter_dotenv.dart';

import '/models/init_get_it.dart';
import '/models/token_model.dart';

final baseUrl = dotenv.env['SERVER_HOST'];
final userAvatarsUrl = '$baseUrl/static/avatars/user';
final groupChatAvatarsUrl = '$baseUrl/static/avatars/group_chat';

final baseOptions = BaseOptions(
  baseUrl: baseUrl!,
  connectTimeout: const Duration(seconds: 5),
  receiveTimeout: const Duration(seconds: 5),
);

var request = Dio(baseOptions)
  ..interceptors.add(
    InterceptorsWrapper(
      onRequest: (
        RequestOptions options,
        RequestInterceptorHandler handler,
      ) async {
        if (getIt.get<Token>().token != '') {
          options.headers['Authorization'] =
              'Bearer ${getIt.get<Token>().token}';
        }
        return handler.next(options);
      },
      onResponse: (Response response, ResponseInterceptorHandler handler) {
        if (response.statusCode! >= 200 && response.statusCode! < 400) {
          if (response.headers.value('Authorization') != null) {
            // update token
            getIt
                .get<Token>()
                .updateToken(response.headers.value('Authorization')!);
          }
          return handler.resolve(response);
        } else {
          handler.reject(
            DioException.badResponse(
              statusCode: response.statusCode!,
              requestOptions: RequestOptions(),
              response: response,
            ),
          );
        }
      },
      onError: (DioException e, ErrorInterceptorHandler handler) {
        handler.reject(e);
      },
    ),
  );