OWIN Social Login

using Microsoft.AspNet.Identity;
using Microsoft.Owin;
using Microsoft.Owin.Security.Cookies;
using Microsoft.Owin.Security.Google;
using Microsoft.Owin.Security.Facebook;
using Owin;

namespace ContactManager
{
    public partial class Startup
    {
        // For more information on configuring authentication, please visit http://go.microsoft.com/fwlink/?LinkId=301864
        public void ConfigureAuth(IAppBuilder app)
        {
            // Enable the application to use a cookie to store information for the signed in user
            app.UseCookieAuthentication(new CookieAuthenticationOptions
            {
                AuthenticationType = DefaultAuthenticationTypes.ApplicationCookie,
                LoginPath = new PathString("/Account/Login")
            });
            
            // Use a cookie to temporarily store information about a user logging in with a third party login provider
            app.UseExternalSignInCookie(DefaultAuthenticationTypes.ExternalCookie);

            app.UseFacebookAuthentication(new FacebookAuthenticationOptions
            {
               AppId = "000000000000000",
               AppSecret = "00000000000000000000000000000000"
            });

            var googleOAuth2AuthenticationOptions = new GoogleOAuth2AuthenticationOptions
            {
                ClientId = "0000000000000-00000000000000000000000000000000.apps.googleusercontent.com",
                ClientSecret = "0000000000000000000000",
            };
            googleOAuth2AuthenticationOptions.Scope.Add("openid");
            app.UseGoogleAuthentication(googleOAuth2AuthenticationOptions);
        }
    }
}