How To Add Firebase Authentication In Unity With Google

How To Add Firebase Authentication In Unity With Google – In today’s interconnected world of app development, ensuring secure and reliable user authentication is paramount. Firebase, Google’s comprehensive mobile and web application development platform, offers a robust solution through its authentication services. This guide aims to walk you through the process of integrating Firebase Authentication with Unity, specifically leveraging Google Sign-In, a popular method for seamless user authentication.

Understanding Unity Firebase Authentication With Google

Firebase Authentication provides backend services, easy-to-use SDKs, and ready-made UI libraries to authenticate users to your Unity applications. It supports various authentication methods including email/password, phone number, and third-party providers like Google, Facebook, and Twitter. Integrating Unity Firebase Google Sign In allows you to manage user sign-ins, safeguard user data, and personalize user experiences effortlessly.

Prerequisites

Before diving into the integration process, ensure you have the following prerequisites:

1. Unity installed on your development machine (version 2017.4 or later recommended).
2. Firebase account and project set up on the Firebase Console.
3. Basic familiarity with Unity development and C# programming.

Step-by-Step Guide: Adding Firebase Authentication to Unity

Step 1: Setting Up Firebase Project

• Create a new Firebase project on the Firebase Console.
• Add your Unity application to the Firebase project.

Step 2: Installing Firebase SDK for Unity

• Download and import the Firebase SDK for Unity into your Unity project.
• Configure Firebase in your Unity project by adding the necessary configuration files.

Step 3: Configuring Google Sign-In

• Enable Google as an authentication provider in the Firebase Console.
• Obtain the Google Services JSON configuration file and add it to your Unity project.

Step 4: Implementing Authentication Logic

• Create a UI for Google Sign-In using Unity’s UI system (e.g., buttons and text fields).
• Write C# scripts to handle user authentication logic using Firebase SDK.
• Implement functions to handle sign-in, sign-out, and user profile management.

Step 5: Testing and Debugging

• Test the authentication flow in the Unity Editor and on actual devices (Android or iOS).
• Handle errors and edge cases gracefully (e.g., network errors, user cancellation).

Step 6: Enhancing User Experience

• Customize the authentication flow and UI elements to match your application’s design.
• Implement additional features like linking multiple authentication providers.

Unity Firebase Google Sign In Full Script

using System.Collections;
using System.Collections.Generic;
using System.Threading.Tasks;
using Firebase.Extensions;
using Google;
using UnityEngine;
using UnityEngine.UI;

public class FirebaseLogin : MonoBehaviour
{
    public string GoogleAPI = "YOUR_API_KEY";

    private GoogleSignInConfiguration configuration;

    Firebase.DependencyStatus dependencyStatus = Firebase.DependencyStatus.UnavailableOther;
    Firebase.Auth.FirebaseAuth auth;
    Firebase.Auth.FirebaseUser user;

    public Text Username, UserEmail;

    public GameObject LoginScreen, ProfileScreen;

    private void Awake() {
        configuration = new GoogleSignInConfiguration{
            WebClientId = GoogleAPI,
            RequestIdToken = true,
        };
    }

    private void Start() {
        InitFirebase();
    }

    void InitFirebase() {
        auth = Firebase.Auth.FirebaseAuth.DefaultInstance;
    }

    public void onClickGoogleSign() {
        GoogleSignIn.Configuration = configuration;
        GoogleSignIn.Configuration.UseGameSignIn = false;
        GoogleSignIn.Configuration.RequestIdToken = true;
        GoogleSignIn.Configuration.RequestEmail = true;

        GoogleSignIn.DefaultInstance.SignIn().ContinueWith(OnGoogleAuthenticatedFinished);
    }

    void OnGoogleAuthenticatedFinished(Task<GoogleSignInUser> task) {
        if (task.IsFaulted) {
            Debug.LogError("Faulted");
        } else if (task.IsCanceled) {
            Debug.LogError("Cancelled");
        } else {
            Firebase.Auth.Credential credential = Firebase.Auth.GoogleAuthProvider.GetCredential(task.Result.IdToken, null);

            auth.SignInWithCredentialAsync(credential).ContinueWithOnMainThread(task => {
                if (task.IsCanceled) {
                    return;
                }

                if (task.IsFaulted) {
                    Debug.LogError("SignInWithCredentialAsync encountered an error: " + task.Exception);
                    return;
                }

                user = auth.CurrentUser;

                Username.text = user.DisplayName;
                UserEmail.text = user.Email;

                LoginScreen.SetActive(false);
                ProfileScreen.SetActive(true);

            });
        }
    }

}