/** Lists all the contacts of the specifed group */
@Security.Authenticated(Secured.class)
public static Result filteredContactsBy(String groupname) {
User user = getCurrentUser();
if (!user.isAdmin) return redirect(routes.Application.contacts());
String btn = groupname;
return ok(views.html.index.render(Contact.findByGroupname(groupname), contactForm, user, btn));
}