Best Practices for Designing Secure Flutter Login Page

In today's digital age, security is paramount. When it comes to mobile app development, designing a secure login page is a fundamental step in safeguarding user data and ensuring a positive user experience.

Flutter, a popular framework for building natively compiled applications for mobile, web, and desktop from a single codebase, provides developers with powerful tools to create secure login pages.

In this comprehensive guide, we will explore the best practices for designing a secure Flutter login page. We will cover various aspects of security, from user authentication and protecting against common threats to managing sessions.

Along the way, we'll provide real-time examples to illustrate these best practices in action. By the end of this blog, you'll be well-equipped to build a robust and secure login page for your Flutter app.

Setting Up Your Flutter Project

Before diving into the intricacies of designing a secure Flutter login page, it's crucial to set up your Flutter project correctly. In this section, we'll walk you through the essential steps, from creating a new Flutter project to adding necessary dependencies that will help you build a robust and secure login page.

Creating a New Flutter Project

If you haven't already installed Flutter and set up your development environment, be sure to follow the official Flutter installation guide for your platform. Once your development environment is ready, you can create a new Flutter project with these steps:

Step 1: Open a Terminal or Command Prompt

Open your preferred terminal or command prompt application. Ensure that you have Flutter and Dart installed and configured correctly. You can check this by running:

1flutter doctor

Fix any issues reported by the flutter doctor before proceeding.

Step 2: Create a New Flutter Project

To create a new Flutter project, use the following command:

1flutter create secure_login_app

You can replace secure_login_app with your desired project name. This command will generate a Flutter project with the given name in your current directory.

Step 3: Navigate to Your Project Directory

Change into your project directory:

1cd secure_login_app

Now that you have set up your Flutter project, you can proceed to add the necessary dependencies for designing a secure login page.

Adding Necessary Dependencies

To implement various security features and functionalities for your login page, you'll need to include relevant dependencies in your Flutter project. Here are some key dependencies you may consider adding:

Firebase Authentication:

Firebase Authentication is a robust authentication system that supports email and password-based login, phone number verification, social media authentication, and more. To add Firebase Authentication to your project, follow these steps:

1. Go to the Firebase Console, create a new project, and configure it for your app platform (iOS/Android).
2. Follow the instructions to add Firebase to your Flutter project. This typically involves adding a google-services.json (for Android) and a GoogleService-Info.plist (for iOS) to your project.
3. Add the Firebase Authentication dependency to your pubspec.yaml file:

1dependencies:
2  firebase_auth: ^latest_version

4. Run flutter pub get to fetch the dependency.

HTTP Package (for API Integration):

If your login page interacts with a backend API for authentication, you'll need the HTTP package to make network requests. Add it to your pubspec.yaml:

1dependencies:
2  http: ^latest_version

Run flutter pub get to install the package.

Shared Preferences (for Local Data Storage):

To securely store sensitive information locally, such as tokens or user preferences, you can use the shared_preferences package. Add it to your pubspec.yaml:

1dependencies:
2  shared_preferences: ^latest_version

Run flutter pub get to install the package.

These are just some of the dependencies you might need, depending on your project's specific requirements. Be sure to check the documentation for each package and configure them as needed for your secure login page.

With your Flutter project set up and the necessary dependencies added, you're now ready to begin designing and implementing your secure login page.

Designing a User-Friendly UI

Creating a user-friendly user interface (UI) for your Flutter login page is essential for providing a positive user experience. In this section, we will delve into the key aspects of designing an intuitive and visually appealing login page. We'll explore the necessary UI components, discuss the principles of clean design, and provide a real-time example of creating the login page UI.

UI Components for a Login Page

A well-designed login page consists of several essential UI components that facilitate user interaction and data input. Here are the core components you should consider including:

1. Text Fields:

Text fields allow users to enter their credentials, such as email or password. Flutter provides the TextField widget for this purpose. Customize it to match your app's style and requirements.

1TextField(
2  decoration: InputDecoration(
3    labelText: 'Email',
4    hintText: 'Enter your email',
5  ),
6)

2. Buttons:

Buttons are crucial for initiating the login process. Use the ElevatedButton or TextButton widget to create login and registration buttons.

1ElevatedButton(
2  onPressed: () {
3    // Handle login logic here
4  },
5  child: Text('Login'),
6)

3. Icons:

Icons can be used for indicating the purpose of text fields (e.g., email or password). Flutter provides a wide range of icons that can be easily incorporated into your login page.

1Icon(Icons.email) // An email icon

4. Images:

You might want to include your app's logo or other relevant images. Use the Image widget to display images within your login page.

1Image.asset('assets/logo.png')

5. Error Messages:

Display error messages when users enter incorrect credentials or encounter issues during login. Consider using a Text widget or a dedicated error message container.

1Text(
2  'Invalid email or password. Please try again.',
3  style: TextStyle(color: Colors.red),
4)

Implementing a Clean and Intuitive Design

A clean and intuitive design enhances the user experience and encourages users to interact with your login page. Here are some design principles to follow:

1. Consistency:

Maintain consistency in terms of colors, fonts, and spacing throughout your login page. Consistency makes the interface predictable and easier to use.

2. Minimalism:

Avoid clutter by keeping the design minimalistic. Focus on essential elements, and eliminate unnecessary distractions.

3. Visual Hierarchy:

Use visual cues like font size, color, and spacing to establish a clear hierarchy of elements. Ensure that the most important components, such as the login button, stand out.

4. Accessibility:

Ensure that your login page is accessible to users with disabilities. Use proper contrast ratios, provide alternative text for images, and follow accessibility guidelines.

5. User Feedback:

Offer immediate feedback when users interact with the UI elements. For instance, change the button appearance when it's pressed to indicate that an action is being taken.

Real-Time Example: Creating the Login Page UI

Now, let's put these concepts into practice with a real-time example of creating a simple Flutter login page UI. In this example, we'll create a basic login page with email and password fields.

1import 'package:flutter/material.dart';
2
3void main() {
4  runApp(MyApp());
5}
6
7class MyApp extends StatelessWidget {
8  @override
9  Widget build(BuildContext context) {
10    return MaterialApp(
11      home: Scaffold(
12        appBar: AppBar(
13          title: Text('Login Page'),
14        ),
15        body: Center(
16          child: Padding(
17            padding: const EdgeInsets.all(20.0),
18            child: Column(
19              mainAxisAlignment: MainAxisAlignment.center,
20              children: [
21                Image.asset(
22                  'assets/logo.png',
23                  width: 120,
24                  height: 120,
25                ),
26                SizedBox(height: 20),
27                TextField(
28                  decoration: InputDecoration(
29                    labelText: 'Email',
30                    hintText: 'Enter your email',
31                  ),
32                ),
33                SizedBox(height: 20),
34                TextField(
35                  obscureText: true,
36                  decoration: InputDecoration(
37                    labelText: 'Password',
38                    hintText: 'Enter your password',
39                  ),
40                ),
41                SizedBox(height: 20),
42                ElevatedButton(
43                  onPressed: () {
44                    // Handle login logic here
45                  },
46                  child: Text('Login'),
47                ),
48                SizedBox(height: 10),
49                Text(
50                  'Forgot your password?',
51                  style: TextStyle(color: Colors.blue),
52                ),
53              ],
54            ),
55          ),
56        ),
57      ),
58    );
59  }
60}
61

This example demonstrates a basic login page UI with a logo, email, password fields, a login button, and a "Forgot your password?" link. You can further enhance and customize this UI to align with your app's branding and design guidelines.

Remember that user-friendly UI design is an ongoing process. Solicit user feedback, conduct usability testing, and make iterative improvements to ensure that your login page meets the needs and expectations of your users.

Implementing User Authentication

User authentication is a critical aspect of your Flutter login page's security. It ensures that only authorized users can access your app's features and data. In this section, we'll explore different authentication methods, integrate Firebase Authentication into your Flutter project, discuss the secure handling of user credentials, and provide a real-time example of adding Firebase Authentication to your login page.

Authentication Methods (Email, Phone, Social)

Diversifying your authentication methods can enhance user convenience and security. Here are some common authentication methods to consider implementing in your Flutter login page:

1. Email and Password:

Email: Users enter their email addresses. Password: Users set a password or reset it if forgotten.

1// Email and password authentication
2FirebaseAuth.instance.createUserWithEmailAndPassword(email: email, password: password);

2. Phone Number:

Users verify their identity by entering a one-time code sent to their phone.

1// Phone number authentication
2FirebaseAuth.instance.signInWithPhoneNumber(phoneNumber);

3. Social Authentication:

Allow users to log in using their social media accounts like Google, Facebook, or Twitter.

1// Social media authentication
2FirebaseAuth.instance.signInWithCredential(credential);

4. Biometric Authentication:

Enable biometric authentication methods like fingerprint or facial recognition for added security and convenience.

1// Biometric authentication
2localAuthentication.authenticateWithBiometrics(...)

Choose authentication methods that align with your app's target audience and requirements. For most apps, a combination of email and social authentication offers a good balance between security and user experience.

Firebase Authentication Integration

Firebase Authentication is a reliable and popular authentication service provided by Google. It offers a seamless way to implement various authentication methods into your Flutter app. Here's how to integrate Firebase Authentication:

Step 1: Set Up Firebase Project

Go to the Firebase Console, create a new project, and configure it for your Flutter app (iOS/Android).

Follow the setup instructions to add Firebase to your app. This typically involves adding configuration files (google-services.json for Android and GoogleService-Info.plist for iOS) to your project.

Step 2: Add Firebase Authentication Dependency

Add the Firebase Authentication dependency to your pubspec.yaml:

1dependencies:
2firebase_auth: ^latest_version

Run flutter pub get to fetch the dependency.

Step 3: Initialize Firebase

In your Flutter app's main file (e.g., main.dart), initialize Firebase:

1import 'package:firebase_core/firebase_core.dart';
2
3void main() async {
4  WidgetsFlutterBinding.ensureInitialized();
5  await Firebase.initializeApp();
6  runApp(MyApp());
7}

Step 4: Implement Firebase Authentication

Now, you can use Firebase Authentication to implement email, phone, social, or other authentication methods within your Flutter app.

1import 'package:firebase_auth/firebase_auth.dart';
2
3Future<void> signInWithEmailPassword(String email, String password) async {
4  try {
5    await FirebaseAuth.instance.signInWithEmailAndPassword(email: email, password: password);
6    // Authentication successful, proceed to the app.
7  } catch (e) {
8    // Handle authentication errors.
9  }
10}

Securely Handling User Credentials

Handling user credentials securely is vital to protect user data. Here are some best practices:

1. Use HTTPS:

Ensure that your app communicates with the authentication server over HTTPS to encrypt data transmission.

2. Hash and Salt Passwords:

When storing passwords, use a strong cryptographic hashing algorithm (e.g., bcrypt) with a unique salt for each user to protect against data breaches.

3. Implement Account Lockout:

Implement mechanisms to detect and prevent brute force attacks by locking user accounts temporarily after a certain number of failed login attempts.

4. Store Tokens Securely:

Safely store authentication tokens (e.g., JWTs) on the client side. Use secure storage options to prevent data leaks.

5. OAuth for Social Logins:

When integrating social logins, use OAuth or OAuth-like protocols provided by the social platforms. Avoid handling user credentials directly.

Real-Time Example: Adding Firebase Authentication

Let's integrate Firebase Authentication into your Flutter login page using the email and password method. Follow these steps:

1. Create a Firebase project and configure it for your Flutter app as mentioned above.
2. Add the firebase_auth dependency to your pubspec.yaml and run flutter pub get.
3. Implement the authentication logic in your Flutter app as shown in the previous sections.

With Firebase Authentication integrated, your Flutter login page will now have a robust and secure user authentication system. Users can sign in using their email and password, and you can expand authentication options to include other methods as needed.

Remember that user authentication is just one part of a secure login page. There are additional security measures, including data encryption and two-factor authentication, to ensure comprehensive security for your Flutter app's login functionality.

Protecting Against Common Threats

Ensuring the security of your Flutter login page involves safeguarding it against common threats and vulnerabilities. In this section, we'll explore some prevalent threats and protective measures you can implement to secure your login page effectively.

We'll focus on protecting against brute force attacks, implementing an account lockout mechanism, and adding CAPTCHA verification. Additionally, we'll provide a real-time example of implementing an account lockout feature.

Brute Force Attacks:

A brute force attack is an attempt to gain unauthorized access by systematically trying every possible combination of usernames and passwords until the correct one is found. To protect your login page against brute force attacks.

Use Strong Password Policies:

Require users to create strong passwords with a combination of uppercase letters, lowercase letters, numbers, and special characters. Encourage the use of passphrases for added security.

Implement Rate Limiting:

Enforce rate limiting on login attempts. Limit the number of failed login attempts within a specific time frame (e.g., per minute) for each user or IP address.

Real-time Example: Implementing Rate Limiting

1int failedLoginAttempts = 0;
2
3Future<void> handleLogin(String username, String password) async {
4  // Check if login attempt is within rate limits
5  if (failedLoginAttempts >= 5) {
6    // Implement account lockout or CAPTCHA verification
7  } else {
8    // Try authenticating the user
9    if (await authenticateUser(username, password)) {
10      // Successful login
11    } else {
12      // Failed login attempt
13      failedLoginAttempts++;
14    }
15  }
16}

Account Lockout Mechanism

An account lockout mechanism temporarily suspends an account after a specified number of failed login attempts, deterring attackers from continuing brute force attacks. To implement an account lockout mechanism:

1. Define Lockout Threshold: Set a threshold for the maximum number of failed login attempts (e.g., 5) before an account is locked.

2. Implement Lockout Timer: When the threshold is reached, lock the account for a predefined duration (e.g., 15 minutes). Users should be informed of the lockout and provided with information on how to reset their password.

Real-time Example: Implementing Account Lockout

1Future<void> handleLogin(String username, String password) async {
2  // Check if the account is locked
3  if (isAccountLocked(username)) {
4    // Inform the user that the account is locked
5    // Provide instructions for unlocking or resetting the password
6  } else {
7    // Try authenticating the user
8    if (await authenticateUser(username, password)) {
9      // Successful login
10    } else {
11      // Failed login attempt
12      failedLoginAttempts++;
13
14      // Check if the lockout threshold is reached
15      if (failedLoginAttempts >= 5) {
16        lockAccount(username); // Lock the account
17        // Inform the user of the account lockout
18      }
19    }
20  }
21}
22

CAPTCHA Verification

CAPTCHA (Completely Automated Public Turing test to tell Computers and Humans Apart) is a test designed to distinguish between human users and automated bots. Integrating CAPTCHA verification can help protect your login page from automated attacks. To add CAPTCHA verification:

1. Integrate a CAPTCHA Service:

Choose a CAPTCHA service provider like Google reCAPTCHA or others and follow their integration guidelines. Typically, you'll need to obtain API keys.

2. Include CAPTCHA Widget:

Add a CAPTCHA widget to your login page. This widget will prompt users to complete a CAPTCHA challenge before proceeding with login.

3. Verify CAPTCHA Response:

Verify the user's CAPTCHA response with the CAPTCHA service provider's API before allowing login.

Real-time Example: Implementing CAPTCHA Verification

Integrating Google reCAPTCHA into your Flutter login page:

1import 'package:google_recaptcha/google_recaptcha.dart';
2
3final recaptcha = GoogleRecaptcha(
4  apiKey: 'YOUR_RECAPTCHA_API_KEY',
5);
6
7// Inside your login page widget
8RecaptchaVerifierWidget(
9  controller: recaptcha,
10  onVerified: () async {
11    // CAPTCHA verification successful, proceed with login
12  },
13  onError: (e) {
14    // CAPTCHA verification failed, handle accordingly
15  },
16),

By implementing CAPTCHA verification, you add an additional layer of security to your login page, making it challenging for automated scripts to perform brute force attacks.

Incorporating these protective measures into your Flutter login page will significantly enhance its security. Combining rate limiting, account lockout, and CAPTCHA verification will help deter attackers and ensure that only legitimate users gain access to your app.

Session Management

Session management is a crucial component of securing your Flutter login page. It involves handling user sessions and implementing mechanisms like session timeout to protect against unauthorized access. In this section, we'll explore these key aspects of session management and provide a real-time example of managing user sessions.

1. User Session Handling

User session handling is the process of keeping track of a user's interaction with your application over a period of time. A user session typically begins when a user logs in and ends when they log out or remain inactive for a certain period. Here's how to manage user sessions effectively:

Session Token:

When a user logs in, generate a unique session token or identifier that represents their session. Store this token securely on the server and associate it with the user's account.

Store Session Data:

Store session-related data, such as the user's ID, username, and session token, either on the server or in a secure client-side storage solution (e.g., secure cookies or local storage).

Validate Session:

Each time a user interacts with your app, validate their session by checking the session token and associated data. Ensure that the session is still active and belongs to the user.

Implement a Logout Mechanism:

Allow users to manually log out, which should invalidate their session token and clear session-related data. Additionally, set an inactivity timer to automatically log users out after a period of inactivity.

2. Implementing Session Timeout

Session timeout is a security feature that automatically logs a user out after a specified period of inactivity. This protects against unauthorized access in case a user forgets to log out. To implement session timeout:

Set an Inactivity Threshold:

Determine the duration of inactivity that should trigger a session timeout. Common values are 15 minutes to a few hours, depending on your app's security requirements.

Track User Activity:

Implement a mechanism to track user activity. This can be done on the client side by monitoring interactions like clicks, keystrokes, and mouse movements.

Update the Session Timeout Period:

Each time a user interacts with your app, reset the session timeout period. If a user is inactive for the defined threshold, initiate an automatic logout.

Real-time Example: Managing User Sessions

Let's take a real-time example of managing user sessions in a Flutter application. We'll set a session timeout of 15 minutes, and the user will be logged out if they are inactive for that duration.

1import 'dart:async';
2import 'package:flutter/material.dart';
3
4void main() {
5  runApp(MyApp());
6}
7
8class MyApp extends StatefulWidget {
9  @override
10  _MyAppState createState() => _MyAppState();
11}
12
13class _MyAppState extends State<MyApp> {
14  Timer? _sessionTimer;
15
16  @override
17  void initState() {
18    super.initState();
19    // Start session timeout timer
20    startSessionTimeout();
21  }
22
23  void startSessionTimeout() {
24    const int sessionTimeoutInMinutes = 15;
25    const Duration timeoutDuration = Duration(minutes: sessionTimeoutInMinutes);
26    
27    _sessionTimer = Timer(timeoutDuration, () {
28      // Session timeout reached, log the user out
29      logoutUser();
30    });
31  }
32
33  void resetSessionTimeout() {
34    _sessionTimer?.cancel();
35    startSessionTimeout();
36  }
37
38  void logoutUser() {
39    // Perform user logout actions here, such as clearing session data
40    // Redirect to the login page or display a session timeout message
41  }
42
43  @override
44  Widget build(BuildContext context) {
45    return MaterialApp(
46      home: Scaffold(
47        appBar: AppBar(
48          title: Text('Session Management Example'),
49        ),
50        body: Center(
51          child: GestureDetector(
52            // Reset session timeout on user interaction
53            onTap: () {
54              resetSessionTimeout();
55              // Handle user interactions here
56            },
57            child: Text(
58              'Welcome to My App',
59              style: TextStyle(fontSize: 24),
60            ),
61          ),
62        ),
63      ),
64    );
65  }
66
67  @override
68  void dispose() {
69    _sessionTimer?.cancel(); // Cancel the timer when the app is disposed
70    super.dispose();
71  }
72}
73

In this example, we use a timer to track inactivity and automatically log the user out after 15 minutes of inactivity. Users can reset the session timeout by interacting with the app, such as tapping on the screen.

Securing Data Transmission

Securing data transmission is essential to protect sensitive information when it travels between the client (your Flutter app) and the backend server. Two fundamental components of data transmission security are HTTPS and SSL/TLS protocols. Additionally, ensuring that passwords are handled securely is a crucial aspect of data security.

HTTPS and SSL/TLS

HTTPS:

HTTPS (Hypertext Transfer Protocol Secure) is an extension of HTTP that provides secure communication over a computer network. It encrypts data sent between the client and the server, ensuring that eavesdroppers cannot intercept sensitive information.

SSL/TLS:

SSL (Secure Sockets Layer) and TLS (Transport Layer Security) are cryptographic protocols that establish a secure connection between the client and the server. SSL/TLS protocols use encryption to protect data in transit.

Secure Communication with Backend

To ensure secure communication with your backend server:

1. Choose a reputable hosting provider or cloud service that supports SSL/TLS for secure data transmission.
2. Enable SSL/TLS on your server to encrypt data before it's sent over the network.
3. Use secure, well-established protocols and libraries for implementing SSL/TLS in your Flutter app.

Example: Enabling HTTPS in Flutter App

To enable HTTPS in your Flutter app, you need to ensure that your backend server supports HTTPS. Many hosting providers offer built-in SSL/TLS support and provide SSL certificates. Once your server is configured for HTTPS, your Flutter app can make secure requests using the https package.

1import 'package:http/http.dart' as http;
2
3final response = await http.get(Uri.https('example.com', '/api/data'));

Password Hashing and Salting

Storing passwords securely is vital to prevent unauthorized access in case of a data breach. Password hashing and salting are techniques used to protect user passwords.

1. Password Hashing:

1. Password hashing involves converting a user's password into a unique string of characters (the hash).
2. Even if the hash is exposed, it's computationally infeasible to reverse it to obtain the original password.

2. Storing Passwords Safely:

1. Store only the hashed passwords on your server.
2. Choose strong, industry-standard hashing algorithms like bcrypt or Argon2.

Example: Implementing Password Hashing

1import 'package:password_hash/password_hash.dart';
2
3String password = 'user123';
4final hashedPassword = PasswordHash.hash(password);
5
6// Store 'hashedPassword' in your database

Adding Two-Factor Authentication (2FA)

Two-factor authentication (2FA) adds an extra layer of security to the login process. Users must provide two forms of identification to access their accounts.

Implementing 2FA with TOTP:

• TOTP (Time-Based One-Time Password) is a commonly used 2FA method.
• Users generate temporary codes using a mobile app or hardware token, which expire after a short time.
• To implement TOTP in your Flutter app, you can use packages like time_machine and OTP to generate and verify TOTP codes.

Example: Adding 2FA to Your App

Let's take a real-time example of adding 2FA to a Flutter app using TOTP. In this example, we'll use the time_machine package to generate TOTP codes.

1import 'package:time_machine/time_machine.dart';
2import 'package:otp/otp.dart';
3
4void main() {
5  final secret = 'your_secret_key';
6  final code = OTP.generateTOTPCode(secret, getCurrentTime());
7  print('Generated TOTP code: $code');
8}
9
10LocalTime getCurrentTime() {
11  final zone = FixedDateTimeZone.forOffset(ZoneInterval(Offset.hours(0), Offset.hours(0)));
12  final now = SystemClock.instance.now();
13  return now.inZone(zone).timeOfDay;
14}
15

Data Encryption

Data encryption involves transforming data into an unreadable format, which can only be deciphered with the correct decryption key.

GDPR Compliance:

If your app deals with user data in the European Union, you must ensure GDPR (General Data Protection Regulation) compliance. GDPR enforces strict rules for the collection, storage, and processing of personal data.

Example: Implementing Data Encryption

Implementing data encryption in a Flutter app typically involves using encryption libraries or tools to protect sensitive data, such as user credentials or personal information. For example, you can use the pointycastle package for encryption:

1import 'package:pointycastle/api.dart';
2import 'package:pointycastle/block/aes.dart';
3import 'package:pointycastle/block/modes/cfb.dart';
4import 'package:pointycastle/key/derivatio/pbkdf2.dart';
5import 'package:pointycastle/key/key_derivators.dart';
6
7void encryptData(String data, String password) {
8  final keyBytes = KeyDerivator.deriveKey(Uint8List.fromList(password.codeUnits), 32);
9  final cfb = CFBBlockCipher(AESFastEngine())..init(true, ParametersWithIV(KeyParameter(keyBytes), Uint8List(16)));
10  final encryptedData = Uint8List(data.length);
11  cfb.processBytes(Uint8List.fromList(data.codeUnits), 0, data.length, encryptedData, 0);
12  final encryptedText = String.fromCharCodes(encryptedData);
13  print('Encrypted Data: $encryptedText');
14}
15

By implementing these security measures, you can strengthen your Flutter login page's security and protect sensitive user data. Additionally, adhering to GDPR guidelines ensures that your app respects users' data privacy.

Conclusion:

Security is not a one-time effort but an ongoing commitment. Designing a secure Flutter login page is crucial to protect user data and build trust. By following the best practices outlined in this guide and implementing them in real-time examples, you can create a login page that offers a seamless user experience and ensures the highest level of security.

Remember that security is a multifaceted aspect of app development. Stay updated with the latest security trends and continuously monitor and improve your app's security measures. By doing so, you'll be able to provide your users with a secure and reliable login page, setting the foundation for a trustworthy mobile app.

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