Meteor get site from Headers

getSite.js

siteData = function(){

  headers.ready(function() {
      //console.log(headers.get());
  });
  var headersReady = headers.ready();

  if (headersReady) {
    var host =  headers.get('host');
    var host = String(host).replace(/^www\./,'');
    Session.set("domain", host);
    var domain = Session.get("domain");
    var theSite = Site.findOne({'domain': domain});

    if (theSite) {
      var theme = theSite.siteTheme;
      Session.set("theme", theme);
      var title = theSite.siteTitle;
      document.title = title;
      return theSite;
    }
  }
};