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[martin-markovic]

Title

Implement Firebase Authentication for Server and Client

Summary

This pull request introduces Firebase authentication for both server-side and client-side. It includes the initialization and configuration of Firebase, as well as the implementation of authentication functions and token handling.

Changes

1. Dependencies Installation

   • Ran npm i firebase firebase-admin command to install necessary dependencies.

2. Firebase Configuration

   • Added Firebase Admin SDK initialization with service account credentials in server.js.
   • Configured Firebase app and Auth with API key and project settings.
   • Exported Firebase Admin and Auth instances for use in the application in server.js.

3. Authentication Implementation

   • Implemented loginWithFirebaseToken and generateFirebaseToken functions in userController.js.
   • Integrated token generation functionality into registerUser and loginUser controllers.
   • Implemented returning Firebase token in response object for registerUser and loginUser controllers.
   • Added validation and error handling to protect middleware based on token, decodedToken, and non-existing user.

4. Code Cleanup and Refactoring

   • Removed redundant imports and Firebase configuration from server.js.
   • Changed server-side auth to depend on admin authentication in server.js.
   • Removed redundant import and client-side authentication from registerUser controller in userController.js.

5. Fixes and Enhancements

   • Fixed loginWithFirebaseToken auth process, returning user from successful authentication and error handling in userController.js.
   • Added ID to string conversion, validation, and error handling to generateFirebaseToken in userController.js.

6. Client-Side Integration

   • Implemented client-side Firebase configuration in firebaseConfig.js.
   • Integrated Firebase token generation, user data validation, and error handling into authentication functions in authService.js.

Testing

• Performed manual tests for evaluating Firebase token generation.

Additional Information

• These changes enhance the security and reliability of the authentication process by leveraging Firebase's robust authentication system.
• Proper error handling and validation ensure that the system is protected against invalid tokens and unauthorized access.