FirebaseのRealtimeDatabaseをUnityからTwitter認証を用いてデータ取得するSample

FirebaseRealtimeDatabaseSample1.cs

using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using UnityEngine;
using TwitterKit.Unity;
using Firebase;
using Firebase.Database;
using Firebase.Unity.Editor;

public class PUFirebaseTwitterLogin : MonoBehaviour {

	// Twitter
	private string _AccessToken;
	private string _Secret;
	private string _UserName;

	// Firebase
	private DatabaseReference _FirebaseDB;
	private Firebase.Auth.FirebaseUser _FirebaseUser;


	void Start () {
		Twitter.Init();
		this.TwitterAuth();

		// Firebase RealtimeDatabase接続初期設定
		FirebaseApp.DefaultInstance.SetEditorDatabaseUrl("Firebase Realtime Database URL");

		// Databaseの参照先設定
		_FirebaseDB = FirebaseDatabase.DefaultInstance.GetReference("UnitySample/Ranking");

	}

	public void FirebaseLogin() {

		Firebase.Auth.FirebaseAuth auth = Firebase.Auth.FirebaseAuth.DefaultInstance;

		Firebase.Auth.Credential credential = Firebase.Auth.TwitterAuthProvider.GetCredential(_AccessToken, _Secret);

		auth.SignInWithCredentialAsync(credential).ContinueWith(task => {
			
			if (task.IsCanceled) {
				Debug.LogError("[Info ] : SignInWithCredentialAsync canceled.");
				return;
			}
			if (task.IsFaulted) {
				Debug.LogError("[Error ] : SignInWithCredentialAsync fatal. an error: " + task.Exception);
				return;
			}

			_FirebaseUser = task.Result;

			// 認証完了したらデータを読み込む
			this.GetRankingData();
		});
	}

	public void TwitterAuth() {
		Debug.Log("[Info] : start login");
		TwitterSession session = Twitter.Session;
		if (session == null) {
			Twitter.LogIn(TwitterLoginComplete, TwitterLoginFailure);
		} else {
			TwitterLoginComplete(session);
		}
	}

	public void TwitterLoginComplete(TwitterSession session) {
		Debug.Log("[Info] : Login success. " + session.authToken);
		_AccessToken = session.authToken.token;
		_Secret      = session.authToken.secret;
		_UserName    = session.userName;

		this.FirebaseLogin();
	}

	public void TwitterLoginFailure(ApiError error) {
		Debug.Log("[Error ] : Login faild code =" + error.code + " msg =" + error.message);
	}

	void GetRankingData() {

		// スコアが1番高いものを取得
		_FirebaseDB.OrderByChild("score").LimitToLast(1).GetValueAsync().ContinueWith(task => {
			if (task.IsFaulted) {
				// 取得エラー
				Debug.Log("[ERROR] get ranking sort");
			} else if (task.IsCompleted) {
				// 取得成功
				Debug.Log("[INFO] get ranking success.");
				DataSnapshot snapshot = task.Result;
				IEnumerator<DataSnapshot> result = snapshot.Children.GetEnumerator();
				int rank = 0;

				string json = snapshot.GetRawJsonValue();

				while (result.MoveNext()) {
					DataSnapshot data = result.Current;
					string name = (string)data.Child("name").Value;
					// Firebaseの数値データはLong型となっているので、一度longで受け取った後にintにキャスト
					int score   = (int)(long)data.Child("score").Value;

					Debug.Log("name : " + name + "    score : " + score);
				}

			}
		});
	}
}