// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved. See License.txt in the project root for license information.
/* TODO:
using System;
using Owin;

namespace Microsoft.AspNet.Security
{
    /// <summary>
    /// Provides extensions methods for app.Property values that are only needed by implementations of authentication middleware.
    /// </summary>
    public static class AppBuilderSecurityExtensions
    {
        /// <summary>
        /// Returns the previously set AuthenticationType that external sign in middleware should use when the
        /// browser navigates back to their return url.
        /// </summary>
        /// <param name="app">App builder passed to the application startup code</param>
        /// <returns></returns>
        public static string GetDefaultSignInAsAuthenticationType(this IAppBuilder app)
        {
            if (app == null)
            {
                throw new ArgumentNullException("app");
            }
            object value;
            if (app.Properties.TryGetValue(Constants.DefaultSignInAsAuthenticationType, out value))
            {
                var authenticationType = value as string;
                if (!string.IsNullOrEmpty(authenticationType))
                {
                    return authenticationType;
                }
            }
            throw new InvalidOperationException(Resources.Exception_MissingDefaultSignInAsAuthenticationType);
        }

        /// <summary>
        /// Called by middleware to change the name of the AuthenticationType that external middleware should use
        /// when the browser navigates back to their return url.
        /// </summary>
        /// <param name="app">App builder passed to the application startup code</param>
        /// <param name="authenticationType">AuthenticationType that external middleware should sign in as.</param>
        public static void SetDefaultSignInAsAuthenticationType(this IAppBuilder app, string authenticationType)
        {
            if (app == null)
            {
                throw new ArgumentNullException("app");
            }
            if (authenticationType == null)
            {
                throw new ArgumentNullException("authenticationType");
            }
            app.Properties[Constants.DefaultSignInAsAuthenticationType] = authenticationType;
        }
    }
}
*/