AuthorizationServer.Controllers.AccountController.Login C# (CSharp) Метод

        public async Task<ActionResult> Login()
        {
            AuthenticationManager authentication = Request.HttpContext.Authentication;

            if (Request.Method == "POST")
            {
                var isPersistent = !string.IsNullOrEmpty(Request.Form["isPersistent"]);

                if (!string.IsNullOrEmpty(Request.Form["submit.Signin"]))
                {
                    var authenticationPrincipal = new ClaimsPrincipal(new[] { new ClaimsIdentity(new[] { new Claim(ClaimsIdentity.DefaultNameClaimType, Request.Form["username"]) }, "Application") });

                    await authentication.SignInAsync("Application", authenticationPrincipal, new AuthenticationProperties { IsPersistent = isPersistent });
                }
            }

            return View();
        }