/// <summary>
/// Appends the SREG required attributes to the request URL constructed on challenge.
/// </summary>
public Task OnChallengeAsync(Microsoft.Owin.Security.AuthenticationResponseChallenge challenge, OpenIDAuthorizationEndpointInfo endpoint)
{
endpoint.Url += "&openid.ns.sreg=" + Uri.EscapeDataString(sregNamespace);
var requiredClaims = string.Join(",", RequiredFields.Select(f => claimsMap[f]));
endpoint.Url += "&openid.sreg.required=" + Uri.EscapeDataString(requiredClaims);
if (OptionalFields.Any())
{
var optionalClaims = string.Join(",", OptionalFields.Select(f => claimsMap[f]));
endpoint.Url += "&openid.sreg.optional=" + Uri.EscapeDataString(optionalClaims);
}
if (!string.IsNullOrEmpty(PolicyUrl))
{
endpoint.Url += "&openid.sreg.policy_url=" + Uri.EscapeDataString(PolicyUrl);
}
return(Task.FromResult(0));
}