Snaparazzi/Assets/Scripts/FirebaseInitializer.cs

using Firebase;
using Firebase.Auth;
using System;
using UnityEngine;
using UnityEngine.Android;

public class FirebaseInitializer : MonoBehaviour
{
    public Action onFirebaseReady;
    public static FirebaseInitializer Instance;

    void Awake()
    {
        Instance = this;
    }

    // Start is called before the first frame update
    void Start()
    {
        AskForCameraAuthorizationForAndroid();

        FirebaseApp.CheckAndFixDependenciesAsync().ContinueWith(task =>
        {
            var dependencyStatus = task.Result;
            if (dependencyStatus == DependencyStatus.Available)
            {
                // Create and hold a reference to your FirebaseApp,
                // where app is a Firebase.FirebaseApp property of your application class.
                var app = FirebaseApp.DefaultInstance;
                Authenticate();

                // Set a flag here to indicate whether Firebase is ready to use by your app.
            }
            else
            {
                Debug.LogError($"Could not resolve all Firebase dependencies: {dependencyStatus}");
            }
        });
    }

    // Update is called once per frame
    void Authenticate()
    {
        FirebaseAuth auth = FirebaseAuth.DefaultInstance;

        auth.SignInAnonymouslyAsync().ContinueWith(task =>
        {
            if (task.IsCanceled)
            {
                Debug.LogError("SignInAnonymouslyAsync was canceled.");
                return;
            }
            if (task.IsFaulted)
            {
                Debug.LogError("SignInAnonymouslyAsync encountered an error: " + task.Exception);
                return;
            }

            AuthResult result = task.Result;
            Debug.Log($"User signed in successfully: {result.User.UserId}");

            onFirebaseReady?.Invoke();
        });
    }

    private void AskForCameraAuthorizationForAndroid()
    {
        if (Permission.HasUserAuthorizedPermission(Permission.Microphone))
        {
            // The user authorized use of the microphone.
        }
        else
        {
            bool useCallbacks = false;
            if (!useCallbacks)
            {
                // We do not have permission to use the microphone.
                // Ask for permission or proceed without the functionality enabled.
                Permission.RequestUserPermission(Permission.Microphone);
            }
            else
            {
                var callbacks = new PermissionCallbacks();
                //callbacks.PermissionDenied += PermissionCallbacks_PermissionDenied;
                //callbacks.PermissionGranted += PermissionCallbacks_PermissionGranted;
                //callbacks.PermissionDeniedAndDontAskAgain += PermissionCallbacks_PermissionDeniedAndDontAskAgain;
                Permission.RequestUserPermission(Permission.Microphone, callbacks);
            }
        }
    }
}