public async Task<ActionResult> ExternalLoginConfirmation(ExternalLoginConfirmationViewModel model)
        {
            if (User.Identity.IsAuthenticated)
            {
                return RedirectToLocal(model.ReturnUrl);
            }

            // Get the information about the user from the external login provider
            var loginInfo = await AuthenticationManager.GetExternalLoginInfoAsync();
            if (loginInfo == null)
            {
                return View("ExternalLoginFailure");
            }
            ApplicationUser existingUser = await UserManager.FindByEmailAsync(loginInfo.Email);
            if (existingUser != null)
            {
                var existingLogins = await UserManager.GetLoginsAsync(existingUser.Id);
                // Another user with the same email exists
                ViewBag.LoginProvider = loginInfo.Login.LoginProvider;
                return View("ExternalLoginConfirmation", new ExternalLoginConfirmationViewModel() { ReturnUrl = model.ReturnUrl, Email = loginInfo.Email, ExistingLogins = existingLogins });
            }

            var user = new ApplicationUser { UserName = loginInfo.DefaultUserName, Email = loginInfo.Email };
            var result = await UserManager.CreateAsync(user);
            if (result.Succeeded)
            {
                result = await UserManager.AddLoginAsync(user.Id, loginInfo.Login);
                if (result.Succeeded)
                {
                    await SignInManager.SignInAsync(user, isPersistent: false, rememberBrowser: false);
                    // This must be done for claim changes to be included in the current app cookie? Why MVC...
                    var authenticationContext = await AuthenticationManager.AuthenticateAsync(DefaultAuthenticationTypes.ExternalCookie);
                    if (authenticationContext != null)
                    {
                        AuthenticationManager.AuthenticationResponseGrant = new AuthenticationResponseGrant(
                            await UserManager.CreateIdentityAsync(user, DefaultAuthenticationTypes.ApplicationCookie),
                            authenticationContext.Properties);
                    }
                    return RedirectToLocal(model.ReturnUrl);
                }
            }
            AddErrors(result);
            // Some user creation error
            return View("ExternalLoginFailure");
        }
        public async Task<ActionResult> Register(RegisterViewModel model, string returnUrl)
        {
            if (ModelState.IsValid)
            {
                var user = new ApplicationUser { FirstName = model.FirstName, LastName = model.LastName, UserName = model.FirstName + " " + model.LastName, Email = model.Email };
                var result = await UserManager.CreateAsync(user, model.Password);
                if (result.Succeeded)
                {
                    await SignInManager.SignInAsync(user, isPersistent:false, rememberBrowser:false);
                    
                    // For more information on how to enable account confirmation and password reset please visit http://go.microsoft.com/fwlink/?LinkID=320771
                    // Send an email with this link
                    // string code = await UserManager.GenerateEmailConfirmationTokenAsync(user.Id);
                    // var callbackUrl = Url.Action("ConfirmEmail", "Account", new { userId = user.Id, code = code }, protocol: Request.Url.Scheme);
                    // await UserManager.SendEmailAsync(user.Id, "Confirm your account", "Please confirm your account by clicking <a href=\"" + callbackUrl + "\">here</a>");

                    return RedirectToLocal(returnUrl);
                }
                AddErrors(result);
            }

            // If we got this far, something failed, redisplay form
            return View(model);
        }
        public async Task<IActionResult> Register(RegisterViewModel model)
        {
            if (ModelState.IsValid)
            {
                var user = new ApplicationUser { UserName = model.Email, Email = model.Email };
                var result = await _userManager.CreateAsync(user, model.Password);
                if (result.Succeeded)
                {
                    // For more information on how to enable account confirmation and password reset please visit http://go.microsoft.com/fwlink/?LinkID=532713
                    // Send an email with this link
                    //var code = await _userManager.GenerateEmailConfirmationTokenAsync(user);
                    //var callbackUrl = Url.Action("ConfirmEmail", "Account", new { userId = user.Id, code = code }, protocol: HttpContext.Request.Scheme);
                    //await _emailSender.SendEmailAsync(model.Email, "Confirm your account",
                    //    "Please confirm your account by clicking this link: <a href=\"" + callbackUrl + "\">link</a>");
                    await _signInManager.SignInAsync(user, isPersistent: false);
                    _logger.LogInformation(3, "User created a new account with password.");
                    return RedirectToAction(nameof(HomeController.Index), "Home");
                }
                AddErrors(result);
            }

            // If we got this far, something failed, redisplay form
            return View(model);
        }
        public async Task<IActionResult> ExternalLoginConfirmation(ExternalLoginConfirmationViewModel model, string returnUrl = null)
        {
            if (User.IsSignedIn())
            {
                return RedirectToAction(nameof(ManageController.Index), "Manage");
            }

            if (ModelState.IsValid)
            {
                // Get the information about the user from the external login provider
                var info = await _signInManager.GetExternalLoginInfoAsync();
                if (info == null)
                {
                    return View("ExternalLoginFailure");
                }
                var user = new ApplicationUser { UserName = model.Email, Email = model.Email };
                var result = await _userManager.CreateAsync(user);
                if (result.Succeeded)
                {
                    result = await _userManager.AddLoginAsync(user, info);
                    if (result.Succeeded)
                    {
                        await _signInManager.SignInAsync(user, isPersistent: false);
                        _logger.LogInformation(6, "User created an account using {Name} provider.", info.LoginProvider);
                        return RedirectToLocal(returnUrl);
                    }
                }
                AddErrors(result);
            }

            ViewData["ReturnUrl"] = returnUrl;
            return View(model);
        }
        public async Task<ActionResult> ExternalLoginConfirmation(ExternalLoginConfirmationViewModel model, string returnUrl)
        {
            if (User.Identity.IsAuthenticated)
            {
                return RedirectToAction("Index", "Manage");
            }

            if (ModelState.IsValid)
            {
                // Get the information about the user from the external login provider
                var info = await AuthenticationManager.GetExternalLoginInfoAsync();
                if (info == null)
                {
                    return View("ExternalLoginFailure");
                }
                var user = new ApplicationUser { UserName = model.Email, Email = model.Email };
                var result = await UserManager.CreateAsync(user);
                if (result.Succeeded)
                {
                    result = await UserManager.AddLoginAsync(user.Id, info.Login);
                    if (result.Succeeded)
                    {
                        await SignInManager.SignInAsync(user, isPersistent: false, rememberBrowser: false);
                        return RedirectToLocal(returnUrl);
                    }
                }
                AddErrors(result);
            }

            ViewBag.ReturnUrl = returnUrl;
            return View(model);
        }