private static IEnumerable <Claim> GetClaims(this LdapEntry entry, string email, string name, string role)
{
var claims = new List <Claim>();
claims.Add(new Claim(email, entry.GetMail()));
claims.Add(new Claim(name, entry.GetName()));
claims.AddRange(entry.GetGroups().Select(group => new Claim(role, group)));
return(claims);
}