use HttpPrincipal, for current user id to avoid CookiePrincipal -> idType mapping fail

import ca.nrc.cadc.ac.Role;

import ca.nrc.cadc.ac.UserNotFoundException;

import ca.nrc.cadc.auth.AuthenticationUtil;

import ca.nrc.cadc.auth.HttpPrincipal;

import ca.nrc.cadc.auth.SSLUtil;

import ca.nrc.cadc.net.event.TransferEvent;

import ca.nrc.cadc.net.event.TransferListener;

        Subject cur = AuthenticationUtil.getCurrentSubject();

        if (cur == null)

            throw new IllegalArgumentException("no subject");

        Set<Principal> ps = cur.getPrincipals();

        Set<HttpPrincipal> ps = cur.getPrincipals(HttpPrincipal.class); // hack

        if (ps.isEmpty())

            throw new IllegalArgumentException("no principals");

        Principal p = ps.iterator().next();

        log.debug("getCurrentID: " + p.getClass());

        return p;

    }