☰

Base64 Link Decoder for 4chan and Archives

Decode base64-encoded links in 4chan posts and various archives

  1. // ==UserScript==
  2. // @name        Base64 Link Decoder for 4chan and Archives
  3. // @namespace   Violentmonkey Scripts
  4. // @match       *://boards.4channel.org/*
  5. // @match       *://boards.4chan.org/*
  6. // @match       *://archived.moe/*
  7. // @match       *://archiveofsins.com/*
  8. // @grant       none
  9. // @version     1.0
  10. // @description Decode base64-encoded links in 4chan posts and various archives
  11. // @license MIT
  12. // ==/UserScript==
  13.  
  14. (function() {
  15.     'use strict';
  16.  
  17.     const base64Regex = /^[A-Za-z0-9+/]+=*$/;
  18.     const isURL = (str) => /^(https?|ftp):\/\/[^\s/$.?#].[^\s]*$/i.test(str);
  19.  
  20.     function decodeAndReplace(element) {
  21.         const html = element.innerHTML;
  22.         const modifiedHtml = html.replace(/<wbr>/g, ''); // Remove <wbr> tags
  23.         element.innerHTML = modifiedHtml;
  24.  
  25.         const textNodes = [];
  26.         const walker = document.createTreeWalker(element, NodeFilter.SHOW_TEXT, null, false);
  27.         let node;
  28.         while (node = walker.nextNode()) {
  29.             textNodes.push(node);
  30.         }
  31.  
  32.         textNodes.forEach(node => {
  33.             const parts = node.textContent.split(/\s+/);
  34.             let changed = false;
  35.             for (let i = 0; i < parts.length; i++) {
  36.                 if (base64Regex.test(parts[i])) {
  37.                     try {
  38.                         const decoded = atob(parts[i]);
  39.                         if (isURL(decoded)) {
  40.                             parts[i] = `<a href="${decoded}" target="_blank">${decoded}</a>`;
  41.                             changed = true;
  42.                         }
  43.                     } catch (e) {
  44.                         // Not a valid base64 string, skip
  45.                     }
  46.                 }
  47.             }
  48.             if (changed) {
  49.                 const span = document.createElement('span');
  50.                 span.innerHTML = parts.join(' ');
  51.                 node.parentNode.replaceChild(span, node);
  52.             }
  53.         });
  54.     }
  55.  
  56.     function processNewPosts() {
  57.         // For 4chan
  58.         const posts = document.querySelectorAll('.postMessage');
  59.         posts.forEach(decodeAndReplace);
  60.  
  61.         // For Archives (ArchiveOfSins, Archived.Moe, etc.)
  62.         const archivePosts = document.querySelectorAll('.text');
  63.         archivePosts.forEach(decodeAndReplace);
  64.     }
  65.  
  66.     function initScript() {
  67.         // Initial processing
  68.         processNewPosts();
  69.  
  70.         // Watch for new posts
  71.         const observer = new MutationObserver((mutations) => {
  72.             mutations.forEach((mutation) => {
  73.                 if (mutation.type === 'childList') {
  74.                     mutation.addedNodes.forEach((node) => {
  75.                         if (node.nodeType === Node.ELEMENT_NODE) {
  76.                             // For 4chan
  77.                             if (node.classList.contains('postContainer')) {
  78.                                 const postMessage = node.querySelector('.postMessage');
  79.                                 if (postMessage) decodeAndReplace(postMessage);
  80.                             }
  81.                             // For Archives
  82.                             if (node.classList.contains('post')) {
  83.                                 const textElement = node.querySelector('.text');
  84.                                 if (textElement) decodeAndReplace(textElement);
  85.                             }
  86.                         }
  87.                     });
  88.                 }
  89.             });
  90.         });
  91.  
  92.         observer.observe(document.body, { childList: true, subtree: true });
  93.     }
  94.  
  95.     // Delay script execution by 5 seconds
  96.     setTimeout(initScript, 5000);
  97. })();