testmycode/tmc-server

<%
   page_metadata = {
     :session_cookie_name => SiteSetting.value(:session_cookie_key),
     :username => current_user.guest? ? nil : current_user.username,
     :base_url => root_url,
     :current_path => request.path
   }
%>
<script type="text/javascript">
  var PageMetadata = <%= raw(page_metadata.to_json) %>;
</script>

<%= csrf_meta_tag %>