get-apex-domain/lib/getApexDomain.js

Returns the apex domain (aka base, bare, naked, root apex, or zone apex domain) of the current web page without the use of a public suffix list. The apex domain is also the top-most domain that allows for setting cookies.

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports["default"] = void 0;
var cookieToken = "__apex_test__";

var getLastArrayItems = function getLastArrayItems(arr, itemCount) {
  return arr.slice(-itemCount);
};
/**
 * Retrieves the apex domain.
 * @param {Object} window The browser's window object
 * @param {Object} cookieJar An object with get, set, and remove methods
 * for cookie manipulation.
 * @returns {string} The apex domain.
 */


var _default = function _default(window, cookieJar) {
  if (!window.navigator.cookieEnabled) {
    throw new Error("Unable to detect apex domain without cookies enabled.");
  }

  var domain = "";
  var hostname = window.location.hostname;
  var hostParts = hostname.toLowerCase().split(".");

  for (var i = 1; i < hostParts.length + 1; i++) {
    domain = getLastArrayItems(hostParts, i).join(".");
    cookieJar.set(cookieToken, cookieToken, ".".concat(domain));

    if (cookieJar.get(cookieToken)) {
      cookieJar.remove(cookieToken, ".".concat(domain));
      return domain;
    }
  } // If we get to this point, it's likely the hostname is
  // "localhost", which is a reserved top-level domain name.

};

exports["default"] = _default;
module.exports = exports.default;