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));
}