public static string IdentifierFromClaim(this ITokenizer tokenizer, HttpRequestMessage request)
{
if (request == null)
{
throw new ArgumentNullException(nameof(request));
}
if (request.Headers.Authorization == null)
{
return(null);
}
if (tokenizer == null)
{
throw new ArgumentNullException(nameof(tokenizer));
}
var principal = tokenizer.Principal(request.Headers.Authorization.Parameter);
return(principal.FindFirst("http://schemas.xmlsoap.org/ws/2005/05/identity/claims/nameidentifier")?.Value);
}