houssemdellai / facebook-login-xamarin-forms Goto Github PK

using System;
using System.Collections.Generic;
using diabetics_app.ViewModels;
using Xamarin.Forms;

namespace diabetics_app.Main
{
    public partial class FacebookProfilePage : ContentPage
    {
		/// <summary>
		/// Make sure to get a new ClientId from:
		/// https://developers.facebook.com/apps/
		/// </summary>
		private string ClientId = "134161603894277";
       // 134161603894277
		public FacebookProfilePage()
		{
			InitializeComponent();

			var apiRequest =
				"https://www.facebook.com/v2.10/dialog/oauth?client_id="
				+ ClientId
				+ "&display=popup&response_type=token&redirect_uri=http://www.facebook.com/connect/login_success.html";

			var webView = new WebView
			{
				Source = apiRequest,
				HeightRequest = 1
			};

			webView.Navigated += WebViewOnNavigated;

			Content = webView;
		}

		private async void WebViewOnNavigated(object sender, WebNavigatedEventArgs e)
		{

			var accessToken = ExtractAccessTokenFromUrl(e.Url);

			if (accessToken != "")
			{
				var vm = BindingContext as FacebookViewModel;

				await vm.SetFacebookUserProfileAsync(accessToken);

				Content = MainStackLayout;
			}
		}

		private string ExtractAccessTokenFromUrl(string url)
		{
			if (url.Contains("access_token") && url.Contains("&expires_in="))
			{
				var at = url.Replace("https://www.facebook.com/connect/login_success.html#access_token=", "");

				if (Device.OS == TargetPlatform.WinPhone || Device.OS == TargetPlatform.Windows)
				{
					at = url.Replace("http://www.facebook.com/connect/login_success.html#access_token=", "");
				}

				var accessToken = at.Remove(at.IndexOf("&expires_in="));

				return accessToken;
			}

			return string.Empty;
		}
	}

}

        var accessToken = ExtractAccessTokenFromUrl(e.Url);
        Console.WriteLine("Token ==>"+accessToken);
      
        
        if (accessToken != "")
        {
            try
            {
                await GetFacebookProfileAsync(accessToken);
                Console.WriteLine("Facebook ID ==>" + facebookProfile.id);
                if (string.IsNullOrEmpty(facebookProfile.email))
                {
                    Application.Current.MainPage = new NavigationPage(new Register());
                }
                else
                {
                    await FacebookLoginSubmit();  
                }
            }
            catch (Exception)
            {

            }
        }
    }

    async Task<FacebookProfileResponse> GetFacebookProfileAsync(string accessToken)
    {
        var requestUrl =
            "https://graph.facebook.com/v2.7/me/"
            + "?fields=first_name,last_name,email"
            + "&access_token=" + accessToken;

        var httpClient = new HttpClient();

        var userJson = await httpClient.GetStringAsync(requestUrl);

        facebookProfile = JsonConvert.DeserializeObject<FacebookProfileResponse>(userJson);

        return facebookProfile;
    }

    private string ExtractAccessTokenFromUrl(string url)
    {
        if (url.Contains("access_token") && url.Contains("&expires_in="))
        {
            var at = url.Replace("https://www.facebook.com/connect/login_success.html#access_token=", "");

            if (Device.OS == TargetPlatform.WinPhone || Device.OS == TargetPlatform.Windows)
            {
                at = url.Replace("http://www.facebook.com/connect/login_success.html#access_token=", "");
            }

            var accessToken = at.Remove(at.IndexOf("&expires_in="));

            return accessToken;
        }

        return string.Empty;
    }`