syncrow-web/lib/services/api/http_interceptor.dart

import 'dart:async';
import 'dart:io';

import 'package:dio/dio.dart';
import 'package:flutter_secure_storage/flutter_secure_storage.dart';
import 'package:syncrow_web/pages/auth/model/token.dart';
import 'package:syncrow_web/services/api/network_exception.dart';
import 'package:syncrow_web/utils/constants/api_const.dart';
import 'package:syncrow_web/utils/snack_bar.dart';

class HTTPInterceptor extends InterceptorsWrapper {
  List<String> headerExclusionList = [];

  List<String> headerExclusionListOfAddedParameters = [
    ApiEndpoints.login,
    ApiEndpoints.getRegion,
    ApiEndpoints.sendOtp
  ];

  @override
  Future<void> onResponse(
      Response response, ResponseInterceptorHandler handler) async {
    if (await validateResponse(response)) {
      super.onResponse(response, handler);
    } else {
      handler.reject(DioException(
          requestOptions: response.requestOptions, response: response));
    }
  }

  @override
  Future<void> onRequest(
      RequestOptions options, RequestInterceptorHandler handler) async {
    const storage = FlutterSecureStorage();
    final token = await storage.read(key: Token.loginAccessTokenKey);
    if (checkHeaderExclusionListOfAddedParameters(options.path)) {
      options.headers
          .putIfAbsent(HttpHeaders.authorizationHeader, () => 'Bearer $token');
    }
    // options.headers['Authorization'] = 'Bearer ${'${token!}123'}';
    super.onRequest(options, handler);
  }

  @override
  Future<void> onError(
      DioException err, ErrorInterceptorHandler handler) async {
    final failure = ServerFailure.fromDioError(err);
    if (failure.toString().isNotEmpty) {
      CustomSnackBar.displaySnackBar(failure.toString());
    }
    const storage = FlutterSecureStorage();
    final token = await storage.read(key: Token.loginAccessTokenKey);
    if (err.response?.statusCode == 401 && token != null) {
      // await AuthCubit.get(NavigationService.navigatorKey.currentContext!).logout();
    }
    super.onError(err, handler);
  }

  /// Validates the response and returns true if it is successful (status code 2xx).
  Future<bool> validateResponse(Response response) async {
    if (response.statusCode != null) {
      if (response.statusCode! >= 200 && response.statusCode! < 300) {
        // If the response status code is within the successful range (2xx),
        // return true indicating a successful response.
        return true;
      } else {
        // If the response status code is not within the successful range (2xx),
        // return false indicating an unsuccessful response.
        return false;
      }
    } else {
      // If the response status code is null, return false indicating an unsuccessful response.
      return false;
    }
  }

  bool checkHeaderExclusionListOfAddedParameters(String path) {
    var shouldAddHeader = true;

    for (final urlConstant in headerExclusionListOfAddedParameters) {
      if (path.contains(urlConstant)) {
        shouldAddHeader = false;
      }
    }
    return shouldAddHeader;
  }
}