AuthorizationServer.Startup.Configure C# (CSharp) Method

        public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory)
        {
            loggerFactory.AddConsole();

            if (env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
            }

            // Enable Application Sign In Cookie
            app.UseCookieAuthentication(
                                           new CookieAuthenticationOptions
                                           {
                                               AuthenticationScheme = "Application",
                                               AutomaticAuthenticate = false,
                                               LoginPath = new PathString(Paths.LoginPath),
                                               LogoutPath = new PathString(Paths.LogoutPath)
                                           }
                                       );

            app.UseCookieAuthentication(
                                           new CookieAuthenticationOptions
                                           {
                                               AuthenticationScheme = "External",
                                               AutomaticAuthenticate = false,
                                               CookieName = CookieAuthenticationDefaults.CookiePrefix + "External",
                                               ExpireTimeSpan = TimeSpan.FromMinutes(5)
                                           }
                                       );

            // Enable google authentication
            app.UseGoogleAuthentication(
                                           new GoogleOptions
                                           {
                                               ClientId = "309638599461-a673etlplktupuk18bo12bfljgfo4tad.apps.googleusercontent.com",
                                               ClientSecret = "YQYDFkClqu6wiSCKukaQqdfW",
                                               SignInScheme = "External",
                                               AutomaticAuthenticate = false
                                           }
                                       );

            // Setup Authorization Server
            app.UseOAuthAuthorizationServer(
                                               options =>
                                               {
                                                   options.AuthorizeEndpointPath = new PathString(Paths.AuthorizePath);
                                                   options.TokenEndpointPath = new PathString(Paths.TokenPath);
                                                   options.ApplicationCanDisplayErrors = true;

            #if DEBUG
                                                   options.AllowInsecureHttp = true;
            #endif

                                                   options.Provider = new OAuthAuthorizationServerProvider
                                                   {
                                                       OnValidateClientRedirectUri = ValidateClientRedirectUri,
                                                       OnValidateClientAuthentication = ValidateClientAuthentication,
                                                       OnGrantResourceOwnerCredentials = GrantResourceOwnerCredentials,
                                                       OnGrantClientCredentials = GrantClientCredetails
                                                   };

                                                   options.AuthorizationCodeProvider = new AuthenticationTokenProvider
                                                   {
                                                       OnCreate = CreateAuthenticationCode,
                                                       OnReceive = ReceiveAuthenticationCode,
                                                   };

                                                   options.RefreshTokenProvider = new AuthenticationTokenProvider
                                                   {
                                                       OnCreate = CreateRefreshToken,
                                                       OnReceive = ReceiveRefreshToken,
                                                   };

                                                   options.AutomaticAuthenticate = false;
                                               }
                                           );

            app.UseMvc(
                          routes =>
                          {
                              routes.MapRoute(
                                                 "DefaultMvc",
                                                 "{controller}/{action}/{id?}"
                                             );

                          }
                      );
        }