/// <summary>
/// Override this method to deal with 401 challenge concerns, if an authentication scheme in question
/// deals an authentication interaction as part of it's request flow. (like adding a response header, or
/// changing the 401 result to 302 of a login page or external sign-in location.)
/// </summary>
/// <param name="properties"></param>
/// <returns>
/// A Task.
/// </returns>
protected override async Task HandleChallengeAsync(AuthenticationProperties properties)
{
if (Options.Configuration == null)
{
Options.Configuration = await Options.ConfigurationManager.GetConfigurationAsync(Context.RequestAborted);
}
if (string.IsNullOrEmpty(properties.RedirectUri))
{
properties.RedirectUri = CurrentUri;
}
//string assertionHostUrl = new Uri(CurrentUri).Scheme + "://" + new Uri(CurrentUri).Authority;
var sendAssertionTo = new Uri(new Uri(CurrentUri), Options.CallbackPath).AbsoluteUri;
//string sendAssertionTo = assertionHostUrl;
//if (!string.IsNullOrEmpty(Options.AssertionURL_PRD))
//{
// string assertionHostPrdUrl = new Uri(Options.AssertionURL_PRD).Host;
// sendAssertionTo = assertionHostUrl == assertionHostPrdUrl ? Options.AssertionURL_PRD : sendAssertionTo;
//}
//if (!string.IsNullOrEmpty(Options.AssertionURL_DEV))
//{
// string assertionHostDevUrl = new Uri(Options.AssertionURL_DEV).Host;
// sendAssertionTo = assertionHostUrl == assertionHostDevUrl ? Options.AssertionURL_DEV : sendAssertionTo;
//}
//if (!string.IsNullOrEmpty(Options.AssertionURL_STG))
//{
// string assertionHostStgUrl = new Uri(Options.AssertionURL_STG).Host;
// sendAssertionTo = assertionHostUrl == assertionHostStgUrl ? Options.AssertionURL_STG : sendAssertionTo;
//}
//prepare AuthnRequest ID, assertion Url and Relay State to prepare for Idp call
string authnRequestId = "id" + Guid.NewGuid().ToString("N");
string assertionConsumerServiceUrl = sendAssertionTo;
GenerateCorrelationId(properties);
string relayState = Options.StateDataFormat.Protect(properties);
//cleanup and remove existing cookies
CookieOptions deleteCookieOptions = Options.RequestCookieId.Build(Context, Clock.UtcNow);
Response.DeleteAllRequestIdCookies(Context.Request, deleteCookieOptions);
//create and append new response cookie
Options.RequestCookieId.Name = Options.AuthenticationScheme + relayState;
Response.Cookies.Append(Options.RequestCookieId.Name, authnRequestId, Options.RequestCookieId.Build(Context));
//create authnrequest call
string authnRequest = _saml2Service.CreateAuthnRequest(Options, authnRequestId, relayState, assertionConsumerServiceUrl);
//call idp
Response.Redirect(authnRequest);
}