feat: logout on getting 401 Unauthorized response

Author: NanoNish

lib/presentation/app/bloc/app_bloc.dart

@@ -1,5 +1,4 @@
 import 'dart:async';
-
 import 'package:appetizer/data/constants/constants.dart';
 import 'package:appetizer/data/services/local/local_storage_service.dart';
 import 'package:appetizer/domain/models/user/user.dart';

lib/utils/interceptors/auth_interceptor.dart

@@ -1,12 +1,18 @@
 import 'dart:async';
-
+import 'package:appetizer/data/constants/constants.dart';
+import 'package:appetizer/data/services/local/local_storage_service.dart';
+import 'package:appetizer/presentation/app/bloc/app_bloc.dart';
+import 'package:appetizer/utils/app_extensions/app_extensions.dart';
 import 'package:dio/dio.dart';
-import 'package:flutter/foundation.dart';
+import 'package:flutter/material.dart';
+import 'package:flutter_bloc/flutter_bloc.dart';
 
 class AuthInterceptor extends Interceptor {
   ValueGetter<FutureOr<String?>>? getToken;
 
-  AuthInterceptor({this.getToken});
+  AuthInterceptor({
+    this.getToken,
+  });
 
   @override
   void onRequest(
@@ -22,4 +28,22 @@ class AuthInterceptor extends Interceptor {
 
     return super.onRequest(options, handler);
   }
+
+  @override
+  void onError(DioException err, ErrorInterceptorHandler handler) {
+    if (err.response?.statusCode == 401) {
+      LocalStorageService.setValue(key: AppConstants.LOGGED_IN, value: false);
+      LocalStorageService.setValue(key: AppConstants.AUTH_TOKEN, value: null);
+      if (BaseApp.currentContext != null) {
+        const snackBar =
+            SnackBar(content: Text('User is inactive or unauthorized!'));
+        ScaffoldMessenger.of(BaseApp.currentContext!).showSnackBar(snackBar);
+      }
+      BaseApp.currentContext
+          ?.read<AppBloc>()
+          .add(const NavigateToLoginScreen());
+    } else {
+      handler.next(err);
+    }
+  }
 }