In this tutorial, we will be using Email & Password authentication system with Flutter Frontend. We will create a simple login application that will allow users to sign in to their account and redirect them to the dashboard screen.

​
Step 1 : Create the Login and Dashboard Screens

  1. Create a new Flutter project using the following command.
flutter create zeromagic_auth
  1. Add this dependency to your package’s pubspec.yaml file:
dependencies:
    flutter:
        sdk: flutter
    http: ^1.1.0
  1. Add the following code in your main.dart file. This contains Login and Dashboard Screens
main.dart
import 'package:flutter/material.dart';
import 'package:http/http.dart' as http;
import 'dart:convert';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Zeromagic Auth App',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: LoginPage(),
    );
  }
}

class LoginPage extends StatefulWidget {
  @override
  _LoginPageState createState() => _LoginPageState(); 
}

class _LoginPageState extends State<LoginPage> {
  final TextEditingController _emailController = TextEditingController();
  final TextEditingController _passwordController = TextEditingController();
  bool _isLoading = false;

  Future<void> _login() async {
    setState(() {
      _isLoading = true;
    });

    final response = await http.post(
      Uri.parse('{auth_base_url}/{auth_endpoint_path}'),
      headers: {
        'Content-Type': 'application/json',
        'APP-KEY': '{your_app_key}',
        },
      body: jsonEncode({
        'email': _emailController.text,
        'password': _passwordController.text,
      }),
    );

    setState(() {
      _isLoading = false;
    });

    if (response.statusCode == 200) {
      final Map<String, dynamic> responseData = json.decode(response.body);
      if (responseData['MSG'] == 'SUCCESS') {
        Navigator.of(context).pushReplacement(
          MaterialPageRoute(
            builder: (context) => DashboardPage(
              email: responseData['BODY']['email'],
              userId: responseData['BODY']['user_id'],
            ),
          ),
        );
      } else {
        _showErrorDialog(responseData['ERR'] ?? 'Unknown error occurred');
      }
    } else {
      _showErrorDialog('Failed to login. Please try again.');
    }
  }

  void _showErrorDialog(String message) {
    showDialog(
      context: context,
      builder: (ctx) => AlertDialog(
        title: Text('An Error Occurred'),
        content: Text(message),
        actions: <Widget>[
          TextButton(
            child: Text('Okay'),
            onPressed: () {
              Navigator.of(ctx).pop();
            },
          )
        ],
      ),
    );
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Login'),
      ),
      body: Center(
        child: Padding(
          padding: EdgeInsets.all(16.0),
          child: Column(
            mainAxisAlignment: MainAxisAlignment.center,
            children: <Widget>[
              TextField(
                controller: _emailController,
                decoration: InputDecoration(labelText: 'Email'),
                keyboardType: TextInputType.emailAddress,
              ),
              TextField(
                controller: _passwordController,
                decoration: InputDecoration(labelText: 'Password'),
                obscureText: true,
              ),
              SizedBox(height: 20),
              _isLoading
                  ? CircularProgressIndicator()
                  : ElevatedButton(
                      onPressed: _login,
                      child: Text('Login'),
                    ),
            ],
          ),
        ),
      ),
    );
  }
}

class DashboardPage extends StatelessWidget {
  final String email;
  final String userId;

  DashboardPage({required this.email, required this.userId});

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Dashboard'),
      ),
      body: Center(
        child: Padding(
          padding: EdgeInsets.all(16.0),
          child: Column(
            mainAxisAlignment: MainAxisAlignment.center,
            children: <Widget>[
              Text(
                'Welcome, $email',
                style: TextStyle(fontSize: 20, fontWeight: FontWeight.bold),
              ),
              SizedBox(height: 10),
              Text(
                'User ID: $userId',
                style: TextStyle(fontSize: 16),
              ),
            ],
          ),
        ),
      ),
    );
  }
}

​
Step 2 : Setup Authentication in Zeromagic

  1. Create and open a new Project in the console. Add a Database to the project. You can use the database spinned up by Zeromagic or connect your own database. Here we are using the cosmosdb database provided by Zeromagic. To add a database, click on the Create Database on the Database section button and add your database.

    Refer here to know more about: Creating Database on the platform

  2. Create a new environment and map the added database to the environment. Here we are using the development environment and employees database

    Refer here to know more about: Creating Environments on the platform

  3. Add the Email & Password authentication connection under Methods. Click Add Connection to create a new connection.

    Refer here to know more about: Adding Authentication on the platform

  4. Now, go to Environments sections and select the environment you created. Copy the Auth Endpoint URL from the environment details. This is your authentication endpoint URL where you will be sending the APi requests. Your Auth endpoint URL looks similar to this:

    Auth Endpoint
    http://authn.zeromagic.cloud/auth/86165f63f34e4be89809c2948c424a99/development/

  5. Before making the APi request, let’s create a new user credentials in the database for this example. You can skip this step if your preferring to go with registering the user and login with that user credentials. We do provide endpoints to create a new user also.

    Refer here to know more about: Creating User on the platform

​
Step 3 : Making the API Request

  1. Replace the {auth_base_url}/{auth_endpoint_path} in the main.dart file with the copied URL from the environment details and with the path to the email password login endpoint. Here the {auth_base_url} is http://authn.zeromagic.cloud/auth/86165f63f34e4be89809c2948c424a99/development/ and {auth_endpoint_path} is /email-password-login.

    Note: Replace the auth_base_url ith your actual URL. Refer to the Authentication API Reference for more details on the API endpoints.

  2. Replace the {your_app_key} with your actual APP-KEY in the headers of main.dart file. You can find the APP-ID and APP-KEY in the Manage -> Settings section of your console.

    main.dart
    final response = await http.post(
    //REPLACE HERE : `{auth_base_url}/{auth_endpoint_path}` with your auth base URL and api endpoint
  Uri.parse('http://authn.zeromagic.cloud/auth/86165f63f34e4be89809c2948c424a99/development/email-password-login'),
  headers: {
    'Content-Type': 'application/json',
    //REPLACE HERE : `{your_app_key}` with your APP-KEY
    'APP-KEY': 'lwc66BSZmPilT7UnNhlut2QFfRYr82ErXMqCYsKhtFM',
    },
  body: jsonEncode({
    'email': _emailController.text,
    'password': _passwordController.text,
  }),
);

​
Step 4 : Run the Application and Login

  1. Run the flutter application. Enter the email and password of the user you created in the database and click on the Login button. Here login credentials users are
    Sample Credentails
    email=genie@zeromagic.cloud
password=genie#magic
  2. If the login is successful, you will be redirected to the dashboard screen. If the login fails, you will see an alert message.

​
Summary

In this tutorial, you learned how to create a simple login application using Flutter and authenticate users using the Zeromagic authentication API. This is a basic example to get you started with authentication in Zeromagic.

We provide more basic authentication methods and advanced method like social login. Feel free to explore the Authentication API Reference and reach out to us if you have any questions.

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