public async Task <IActionResult> Login(LoginInputModel model, string button) { // check if we are in the context of an authorization request var context = await _interaction.GetAuthorizationContextAsync(model.ReturnUrl); // the user clicked the "cancel" button if (button != "login") { if (context != null) { // if the user cancels, send a result back into IdentityServer as if they // denied the consent (even if this client does not require consent). // this will send back an access denied OIDC error response to the client. await _interaction.DenyAuthorizationAsync(context, AuthorizationError.AccessDenied); // we can trust model.ReturnUrl since GetAuthorizationContextAsync returned non-null if (context.IsNativeClient()) { // The client is native, so this change in how to // return the response is for better UX for the end user. return(this.LoadingPage("Redirect", model.ReturnUrl)); } return(Redirect(model.ReturnUrl)); } else { // since we don't have a valid context, then we just go back to the home page return(Redirect("~/")); } } if (ModelState.IsValid) { // validate username/password against in-memory store if (_users.AreUserCredentialsValid(model.Username, model.Password)) { var user = _users.GetUserByUsername(model.Username); await _events.RaiseAsync(new UserLoginSuccessEvent(user.Username, user.SubjectId, user.Username, clientId : context?.Client.ClientId)); // only set explicit expiration here if user chooses "remember me". // otherwise we rely upon expiration configured in cookie middleware. AuthenticationProperties props = null; if (AccountOptions.AllowRememberLogin && model.RememberLogin) { props = new AuthenticationProperties { IsPersistent = true, ExpiresUtc = DateTimeOffset.UtcNow.Add(AccountOptions.RememberMeLoginDuration) }; } // issue authentication cookie with subject ID and username var isuser = new IdentityServerUser(user.SubjectId) { DisplayName = user.Username }; await HttpContext.SignInAsync(isuser, props); if (context != null) { // we can trust model.ReturnUrl since GetAuthorizationContextAsync returned non-null return(context.IsNativeClient() ? this.LoadingPage("Redirect", model.ReturnUrl) : Redirect(model.ReturnUrl)); } // request for a local page if (Url.IsLocalUrl(model.ReturnUrl)) { return(Redirect(model.ReturnUrl)); } if (string.IsNullOrEmpty(model.ReturnUrl)) { return(Redirect("~/")); } // user might have clicked on a malicious link - should be logged throw new Exception("invalid return URL"); } await _events.RaiseAsync(new UserLoginFailureEvent(model.Username, "invalid credentials", clientId : context?.Client.ClientId)); ModelState.AddModelError(string.Empty, AccountOptions.InvalidCredentialsErrorMessage); } // something went wrong, show form with error var vm = await BuildLoginViewModelAsync(model); return(View(vm)); }