Blob file download in Angular.js using $resource Part 3

gistfile3.js

/* global URL */

(function () {
  'use strict';

  angular
    .module('app')
    .controller('EmailCtrl', EmailCtrl);

  function EmailCtrl($scope, Email) {
    var vm = this
      , downloadableBlob = '';

    vm.getUploadedFileUrl = function getUploadedFileUrl() {
      return downloadableBlob;
    };

    $scope.$on('$stateChangeSuccess', updateDownloadableBlob);

    function updateDownloadableBlob() {
      Email
        .getFile({
          emailId: 1,
          fileName: 'some.xlsx'
        })
        .$promise
        .then(function (data) {
          downloadableBlob = URL.createObjectURL(data.response);
        });
    }
  }
}());