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GMX/Mail.com Outgoing URL Decoder

Decodes and rewrites external URLs. Stops URL tracking/analytics

  1. // ==UserScript==
  2. // @name         GMX/Mail.com Outgoing URL Decoder
  3. // @namespace    https://github.com/2zzly/GMX-Mail-deref-decoder
  4. // @version      1
  5. // @description  Decodes and rewrites external URLs. Stops URL tracking/analytics
  6. // @author       1Deref
  7. // @match        *://*/*
  8. // @grant        none
  9. // @license MIT
  10. // ==/UserScript==
  11.  
  12. (function() {
  13.     'use strict';
  14.  
  15.     function decodeAndRewriteUrl(url) {
  16.         const regexMail = /https:\/\/deref-mail\.com\/mail\/client\/([a-zA-Z0-9-_]{11})\/dereferrer\/\?redirectUrl=(.+)/;
  17.         const regexGMX = /https:\/\/deref-gmx\.net\/mail\/client\/([a-zA-Z0-9-_]{11})\/dereferrer\/\?redirectUrl=(.+)/;
  18.  
  19.         const matchMail = url.match(regexMail);
  20.         const matchGMX = url.match(regexGMX);
  21.  
  22.         if (matchMail && matchMail[2]) {
  23.             const strippedUrl = matchMail[2];
  24.             const decodedUrl = decodeURIComponent(strippedUrl);
  25.             return decodedUrl;
  26.         }
  27.  
  28.         if (matchGMX && matchGMX[2]) {
  29.             const strippedUrl = matchGMX[2];
  30.             const decodedUrl = decodeURIComponent(strippedUrl);
  31.             return decodedUrl;
  32.         }
  33.  
  34.         return null;
  35.     }
  36.  
  37.     function injectScript(frame) {
  38.         const script = document.createElement('script');
  39.         script.textContent = `
  40.             (function() {
  41.                 const links = document.querySelectorAll('a');
  42.                 for (const link of links) {
  43.                     const decodedUrl = decodeAndRewriteUrl(link.href);
  44.                     if (decodedUrl) {
  45.                         link.href = decodedUrl;
  46.                     }
  47.                 }
  48.             })();
  49.         `;
  50.         frame.contentDocument.head.appendChild(script);
  51.     }
  52.  
  53.     function handleFrames() {
  54.         const frames = document.querySelectorAll('iframe');
  55.         for (const frame of frames) {
  56.             injectScript(frame);
  57.         }
  58.     }
  59.  
  60.     // Handle the top-level document
  61.     const links = document.querySelectorAll('a');
  62.     for (const link of links) {
  63.         const decodedUrl = decodeAndRewriteUrl(link.href);
  64.         if (decodedUrl) {
  65.             link.href = decodedUrl;
  66.         }
  67.     }
  68.  
  69.     // Handle frames
  70.     handleFrames();
  71. })();