XamarinAuth.Sample

AuthService.cs

using System;
using System.Diagnostics;
using System.Json;
using System.Linq;
using XamainAuthentication.Models;
using XamainAuthentication.Services;
using Xamarin.Auth;
using Xamarin.Forms;

namespace XamainAuthentication.Services
{
	public class AuthService
	{
		public static OAuth2Authenticator Authenticator { get; private set; }
		
		public void Authenticate(LoginTypeEnum type)
		{
			var account = AccountStore.Create().FindAccountsForService(Constants.AppName).FirstOrDefault();
			if (account != null)
				return;

			switch (type)
			{
				case LoginTypeEnum.Facebook:
					FacebookAuth();
					break;
				case LoginTypeEnum.Twitter:
					TwitterAuth();
					break;
				case LoginTypeEnum.Instagram:
					InstagramAuth();
					break;
				case LoginTypeEnum.Google:
					GoogleAuth();
					break;
				default:
					break;
			}

			Authenticator.Completed += Authenticator_Completed;
			Authenticator.Error += Authenticator_Error;

			var presenter = new Xamarin.Auth.Presenters.OAuthLoginPresenter();
			presenter.Login(Authenticator);
		}
	}
}