How can I take username from session and show it at the headerItem on HANA SHELL

var username = '';

jQuery.ajax({

          url: "/sap/hana/xs/ide/editor/server/dbinfo.xsjs",

          type: 'GET',

          dataType: "json",

          async:false,

          success: function(data, s, xhr) {

          if (xhr.getResponseHeader("x-sap-login-page")) {

                  return;

              }

              if (data) {

              username = data.user;

              }

          },

      });