public static IApplicationBuilder UseWsFedAuthentication(
            this IApplicationBuilder app,
            WsFedAuthenticationOptions options)
        {
            if (app == null)
            {
                throw new ArgumentNullException(nameof(app));
            }

            if (options == null)
            {
                throw new ArgumentNullException(nameof(options));
            }

            return(app.UseMiddleware <WsFedAuthenticationMiddleware>(Options.Create(options)));
        }
        public static IApplicationBuilder UseWsFedAuthentication(
            this IApplicationBuilder app,
            Action <WsFedAuthenticationOptions> configureOptions)
        {
            if (app == null)
            {
                throw new ArgumentNullException(nameof(app));
            }

            var options = new WsFedAuthenticationOptions();

            if (configureOptions != null)
            {
                configureOptions(options);
            }

            return(app.UseWsFedAuthentication(options));
        }