flutter_auth_provider

Simple and extensible authentication manager for apps built with Flutter.

Getting started

Steps

Add as a dependency.
Implement the Stores.
Connect the store to your views.

Concepts

1. Stores

Stores are abstract classes that allow you to implement your custom persistence layer for authentication related data.

You can implement your own authentication persistence logic by implementing the Stores.

AuthStore - This is your user related data store. When you implement the AuthStore, you can also use a custom type for a User specified as a generic.
TokenStore - Implement how you store and refresh the token.

Example implementation with flutter-secure-storage.

import 'package:flutter_auth_provider/flutter_auth_provider.dart';
import 'package:flutter_secure_storage/flutter_secure_storage.dart';

class User {
  string userName;
  string role;

  const User({ required this.role, required this.userName});
}

const String userNameKey = 'userName';
const String roleKey = 'name';
const String tokenKey = 'token';
const String refreshTokenKey = 'refreshToken';


class SecureStore implements AuthStore<User>, TokenStore {
  static SecureStore _instance = const SecureStore._();
  final FlutterSecureStorage _storage = const FlutterSecureStorage();

  const SecureStore._();

  factory SecureStore() => _instance;

  @override
  Future<void> delete() async {
    await _storage.delete(key: userNameKey);
    await _storage.delete(key: roleKey);
  }

  @override
  Future<User?> retrieve() async {
    final userName = await _storage.read(key: userNameKey);
    final role = await _storage.read(key: roleKey);
    if (userName != null && role != null) {
      return User(userName: userName, role: role);
    }
    return null;
  }

  @override
  Future<void> save(User user) async {
    await _storage.write(key: userNameKey, value: user.userName);
    await _storage.write(key: roleKey, value: user.role);
  }

  @override
  Future<void> clear() async {
    await _storage.delete(key: tokenKey);
    await _storage.delete(key: refreshTokenKey);
  }

  @override
  Future<String?> getRefreshToken() async {
    return _storage.read(key: refreshTokenKey);
  }

  @override
  Future<String?> getToken() async {
    return _storage.read(key: tokenKey);
  }

  @override
  Future<void> saveTokens({required String token, String? refreshToken}) async {
    await _storage.write(key: tokenKey, value: token);
    if (refreshToken != null) {
      await _storage.write(key: refreshTokenKey, value: refreshToken);
    }
  }
}

2. Listeners

There are two listeners available. These will execute your code upon Authentication events.

LoginListener - Called when user is logged in.
LogoutListener - Called when user logs out.

Examples:

Setting up Sentry with user details.
Remove/setup/release resources upon logging out.