browser/extensions/activity-stream/lib/ShortURL.jsm
author Kris Maglione <maglione.k@gmail.com>
Mon, 29 Jan 2018 15:20:18 -0800
changeset 453844 34c999fa006bffe8705cf50c54708aa21a962e62
parent 453830 505fc52bd6080c95bf27458a5753340b326f0fa1
child 453889 c6e0fe339cb1e7c0c029e68be5332e52f53ab6b7
permissions -rw-r--r--
Bug 1431533: Part 5a - Auto-rewrite code to use ChromeUtils import methods. r=florian This was done using the following script: https://bitbucket.org/kmaglione/m-c-rewrites/src/37e3803c7a23385bab5ea077ba8692bcfe1608fc/processors/chromeutils-import.jsm MozReview-Commit-ID: 1Nc3XDu0wGl

const {utils: Cu} = Components;
ChromeUtils.import("resource://gre/modules/XPCOMUtils.jsm");
ChromeUtils.import("resource://gre/modules/Services.jsm");

XPCOMUtils.defineLazyServiceGetter(this, "IDNService", "@mozilla.org/network/idn-service;1", "nsIIDNService");

Cu.importGlobalProperties(["URL"]);

/**
 * Properly convert internationalized domain names.
 * @param {string} host Domain hostname.
 * @returns {string} Hostname suitable to be displayed.
 */
function handleIDNHost(hostname) {
  try {
    return IDNService.convertToDisplayIDN(hostname, {});
  } catch (e) {
    // If something goes wrong (e.g. host is an IP address) just fail back
    // to the full domain.
    return hostname;
  }
}

/**
 * Get the effective top level domain of a host.
 * @param {string} host The host to be analyzed.
 * @return {str} The suffix or empty string if there's no suffix.
 */
function getETLD(host) {
  try {
    return Services.eTLD.getPublicSuffixFromHost(host);
  } catch (err) {
    return "";
  }
}

this.getETLD = getETLD;

/**
 * shortURL - Creates a short version of a link's url, used for display purposes
 *            e.g. {url: http://www.foosite.com}  =>  "foosite"
 *
 * @param  {obj} link A link object
 *         {str} link.url (required)- The url of the link
 * @return {str}   A short url
 */
this.shortURL = function shortURL({url}) {
  if (!url) {
    return "";
  }

  // Make sure we have a valid / parseable url
  let parsed;
  try {
    parsed = new URL(url);
  } catch (ex) {
    // Not entirely sure what we have, but just give it back
    return url;
  }

  // Clean up the url (lowercase hostname via URL and remove www.)
  const hostname = parsed.hostname.replace(/^www\./i, "");

  // Remove the eTLD (e.g., com, net) and the preceding period from the hostname
  const eTLD = getETLD(hostname);
  const eTLDExtra = eTLD.length > 0 ? -(eTLD.length + 1) : Infinity;

  // Ideally get the short eTLD-less host but fall back to longer url parts
  return handleIDNHost(hostname.slice(0, eTLDExtra) || hostname) ||
    parsed.pathname || parsed.href;
};

this.EXPORTED_SYMBOLS = ["shortURL", "getETLD"];