code: function urlIsAllowedOriginFactory(whitelistedOriginUrls) {
    var parsedAllowedOriginUrls = [originUrl].concat(whitelistedOriginUrls.map(urlResolve));
  
    /**
     * Check whether the specified URL (string or parsed URL object) has an origin that is allowed
     * based on a list of whitelisted-origin URLs. The current location's origin is implicitly
     * trusted.
     *
     * @param {string|Object} requestUrl - The URL to be checked (provided as a string that will be
     *     resolved or a parsed URL object).
     *
     * @returns {boolean} - Whether the specified URL is of an allowed origin.
     */
    return function urlIsAllowedOrigin(requestUrl) {
      var parsedUrl = urlResolve(requestUrl);
      return parsedAllowedOriginUrls.some(urlsAreSameOrigin.bind(null, parsedUrl));
    };
  }
docs: Create a function that can check a URL's origin against a list of allowed/whitelisted origins.
  The current location's origin is implicitly trusted.
  
  @param {string[]} whitelistedOriginUrls - A list of URLs (strings), whose origins are trusted.
  
  @returns {Function} - A function that receives a URL (string or parsed URL object) and returns
  whether it is of an allowed origin.