error: Could not parse auth token. (Flutter)

[ihsanshukran]

I'm having a class Products, which looks like this:

class Products with ChangeNotifier {
  final String authToken;
  Products(this.authToken, this._items);
  List<Product> _items = [];// data is fetched from server to _items
 Future<void> fetchAndSetProducts() async {
    print('Executing fetchAndSetProducts ');
    print('authToken : '+authToken.toString());
    final url =
        'https://flutter-project-8c2b1-default-rtdb.firebaseio.com/products.json?auth=$authToken';
    try {
      final response = await http.get(Uri.parse(url));
      final extractedData = json.decode(response.body) as Map<String, dynamic>;
      print(extractedData);
      if (extractedData == null) {
        return;
      }
      final List<Product> loadedProducts = [];
      extractedData.forEach((prodId, prodData) {
        loadedProducts.add(Product(
          id: prodId,
          title: prodData['title'],
          description: prodData['description'],
          price: prodData['price'],
          isFavorite: prodData['isFavorite'],
          imageUrl: prodData['imageUrl'],
        ));
      });
      _items = loadedProducts;
      notifyListeners();
    } catch (error) {
      print(error);
      throw (error);
    }
  }
}

And my main.dart file Providers section looks like this:

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MultiProvider(
      providers: [
        ChangeNotifierProvider(
          create: (ctx) => Auth(),
        ),
        ChangeNotifierProxyProvider<Auth, Products>(
          create: (context) => Products('', []),
          update: (ctx, auth, previousProducts) => Products(
            auth.token,
            previousProducts == null ? [] : previousProducts.items,
          ),
        ),
        ChangeNotifierProvider(
          create: (ctx) => Cart(),
        ),
        ChangeNotifierProvider(
          create: (ctx) => Orders(),
        ),
      ],
      child: Consumer<Auth>(
        builder: (ctx, auth, _) => MaterialApp(
          title: 'MyShop',
          theme: ThemeData(
            primarySwatch: Colors.purple,
            accentColor: Colors.deepOrange,
            fontFamily: 'Lato',
          ),
          home: auth.isAuth ? ProductsOverviewScreen() : AuthScreen(),
          routes: {
            ProductDetailScreen.routeName: (ctx) => ProductDetailScreen(),
            },
        ),
      ),
    );
  }
}

This is auth.dart file:

import 'dart:convert';

import 'package:flutter/widgets.dart';
import 'package:http/http.dart' as http;
import '../models/http_exception.dart';

class Auth with ChangeNotifier {
  late String _token;
  DateTime? _expiryDate;
  late String _userId;

  bool get isAuth {
    // ignore: unnecessary_null_comparison
    return token != null;
  }

  String get token {
    // ignore: unnecessary_null_comparison
    if (_expiryDate != null &&
        _expiryDate!.isAfter(DateTime.now()) &&
        // ignore: unnecessary_null_comparison
        _token != null) {
      return _token;
    }
    return '';
  }

  Future<void> _authenticate(
      String email, String password, String urlSegment) async {

    final url =
        'https://identitytoolkit.googleapis.com/v1/accounts:$urlSegment?key=AIzaSyDKCsheQ6YNRyvnFxUPXnSs1k7Sc6qft04';
    try {
      final response = await http.post(
        Uri.parse(url),
        body: json.encode(
          {
            'email': email,
            'password': password,
            'returnSecureToken': true,
          },
        ),
      );
      final responseData = json.decode(response.body);
      if (responseData['error'] != null) {
        throw HttpException(responseData['error']['message']);
      }
      _token = responseData['idToken'];
      print('token inside auth.dart is: ' + _token);

      _userId = responseData['localId'];
      _expiryDate = DateTime.now().add(
        Duration(
          seconds: int.parse(
            responseData['expiresIn'],
          ),
        ),
      );
      notifyListeners();
    } catch (error) {
      throw error;
    }
  }

  Future<void> signup(String email, String password) async {
    return _authenticate(email, password, 'signUp');
  }

  Future<void> login(String email, String password) async {
    return _authenticate(email, password, 'signInWithPassword');
  }
}

while running the app, I get an empty authToken, and the error is: error: Could not parse auth token.

[stale[bot]]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[stale[bot]]

Closing the issue due to inactivity. Feel free to re-open