AccountController.cs

// Copyright (c) Microsoft. All rights reserved. Licensed under the MIT license. See full license at the bottom of this file.
using Microsoft.IdentityModel.Clients.ActiveDirectory;
using Microsoft.Owin.Security;
using Microsoft.Owin.Security.Cookies;
using Microsoft.Owin.Security.OpenIdConnect;
using O365_APIs_Start_ASPNET_MVC.Utils;
using System;
using System.Security.Claims;
using System.Web;
using System.Web.Mvc;

namespace O365_APIs_Start_ASPNET_MVC.Controllers
{
    /// <summary>
    /// Controls sign-in and sign-out.
    /// </summary>
    public class AccountController : Controller
    {
        public void SignIn()
        {
            // Send an OpenID Connect sign-in request.
            if (!Request.IsAuthenticated)
            {
                HttpContext.GetOwinContext().Authentication.Challenge(new AuthenticationProperties { RedirectUri = "/" }, OpenIdConnectAuthenticationDefaults.AuthenticationType);
            }
        }
        public void SignOut()
        {
            // Remove all cache entries for this user and send an OpenID Connect sign-out request.
            string callbackUrl = Url.Action("SignOutCallback", "Account", routeValues: null, protocol: Request.Url.Scheme);
            
            HttpContext.GetOwinContext().Authentication.SignOut(
                new AuthenticationProperties { RedirectUri = callbackUrl },
                OpenIdConnectAuthenticationDefaults.AuthenticationType, CookieAuthenticationDefaults.AuthenticationType);
        }

        public ActionResult SignOutCallback()
        {
            if (Request.IsAuthenticated)
            {
                // Redirect to home page if the user is authenticated.
                return RedirectToAction("Index", "Home");
            }

            return View();
        }

        public void RefreshSession()
        {
            string strRedirectController = Request.QueryString["redirect"];

            HttpContext.GetOwinContext().Authentication.Challenge(new AuthenticationProperties { RedirectUri = String.Format("/{0}", strRedirectController) }, OpenIdConnectAuthenticationDefaults.AuthenticationType);
        }
    }
}

//*********************************************************  
//  
//O365 APIs Starter Project for ASPNET MVC, https://github.com/OfficeDev/Office-365-APIs-Starter-Project-for-ASPNETMVC
// 
//Copyright (c) Microsoft Corporation 
//All rights reserved.  
// 
//MIT License: 
// 
//Permission is hereby granted, free of charge, to any person obtaining 
//a copy of this software and associated documentation files (the 
//""Software""), to deal in the Software without restriction, including 
//without limitation the rights to use, copy, modify, merge, publish, 
//distribute, sublicense, and/or sell copies of the Software, and to 
//permit persons to whom the Software is furnished to do so, subject to 
//the following conditions: 
// 
//The above copyright notice and this permission notice shall be 
//included in all copies or substantial portions of the Software. 
// 
//THE SOFTWARE IS PROVIDED ""AS IS"", WITHOUT WARRANTY OF ANY KIND, 
//EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 
//MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 
//NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE 
//LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION 
//OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION 
//WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. 
//  
//*********************************************************