Facebook HEXtoTEXT

Convert HEX to text, in a post or comment on Facebook.
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// ==UserScript==
// @name            Facebook HEXtoTEXT
// @namespace       https://github.com/holozok
// @description     Convert HEX to text, in a post or comment on Facebook.
// @version         1.0.1
// @icon            https://i.imgur.com/oz5CjJe.png
// @author          holozok
// @ref             Original author: lelinhtinh (baivong)
// @license         MIT; https://baivong.mit-license.org/license.txt
// @match           https://*.facebook.com/*
// @require         https://greasemonkey.github.io/gm4-polyfill/gm4-polyfill.js?v=a834d46
// @run-at          document-idle
// @grant           GM.openInTab
// @grant           GM_openInTab
// ==/UserScript==

/**
 * If `false`, open in new tab after clicking on decoded link.
 * @type {boolean} true or false
 */
const COPY_ONLY = false;

/**
 * Makes the tab being opened inside a incognito mode/private mode window.
 * Currently, only works with Tampermonkey BETA.
 * @type {boolean} true or false
 */
const PRIVATE = true;

function validURL(url) {
  try {
    const uri = new URL(url);
    return !!uri.host && uri.host.includes('.');
  } catch (e) {
    return false;
  }
}

function cleanWordBreak(post) {
  if (post.querySelector('.word_break') !== null) {
    post.querySelectorAll('wbr').forEach((e) => e.remove());

    post.querySelectorAll('span').forEach((span) => {
      if (span.querySelector('span, img') !== null) return;
      const text = document.createTextNode(span.textContent);
      span.parentNode.replaceChild(text, span);
    });
  }
}

function renderResult(post, data) {
  const { content, result } = data;
  if (!content || !result) return;

  post.innerHTML = post.innerHTML.replace(
    content,
    `
<strong
  class="fb-hex${validURL(result) ? ' fb-hex-link' : ''}"
  title="${COPY_ONLY ? '' : 'Click to open in new tab'}"
  style="cursor:pointer"
>${result}</strong>
    `,
  );
}

function handle(post) {
  if (post.querySelector('.fb-hex') !== null) return;
  cleanWordBreak(post);

  const handleURL = URL.createObjectURL(
    new Blob(
      [
        '(',
        function () {
          self.onmessage = (e) => {
            function hex2ascii(hex) {
              if (!(typeof hex === 'number' || typeof hex == 'string')) return '';

              hex = hex.toString().replace(/\s+/gi, '');
              const stack = [];

              for (let i = 0; i < hex.length; i += 2) {
                const code = parseInt(hex.substr(i, 2), 16);
                if (!isNaN(code) && code !== 0) {
                  stack.push(String.fromCharCode(code));
                }
              }

              return stack.join('');
            }

            function getResult(content) {
              content = content.match(/\b[a-f0-9\s]{12,}\b/i);
              if (content === null) return {};

              content = content[0].trim();
              const result = hex2ascii(content);

              return { content, result };
            }

            self.postMessage(getResult(e.data));
          };
        }.toString(),
        ')()',
      ],
      {
        type: 'application/javascript',
      },
    ),
  );
  const worker = new Worker(handleURL);

  worker.onmessage = (e) => {
    if (!e.data) return;
    renderResult(post, e.data);
  };
  worker.postMessage(post.textContent);
}

function getPost(e) {
  let target = e.target;
  
  if (target.closest('button, [role="button"], svg, path')) return;
  
  let post = target;
  let depth = 0;
  
  while (post && depth < 20) {
    const text = post.textContent || '';
    
    if (text.length > 12 && /[a-f0-9\s]{12,}/i.test(text)) {
      console.log('Found hex text in element:', post.tagName, text.substring(0, 50));
      handle(post);
      return;
    }
    
    post = post.parentElement;
    depth++;
  }
}

document.addEventListener('dblclick', getPost, true);
document.addEventListener('click', function(e) {
  const target = e.target;
  if (!target.textContent) return;
  
  if (!window.clickCount) window.clickCount = 0;
  if (!window.lastClickTime) window.lastClickTime = 0;
  
  const now = Date.now();
  if (now - window.lastClickTime > 300) {
    window.clickCount = 0;
  }
  window.lastClickTime = now;
  window.clickCount++;
  
  if (window.clickCount >= 3) {
    window.clickCount = 0;
    getPost(e);
  }
}, true);

function decodedClicking(e) {
  const target = e.target;
  if (!target.classList.contains('fb-hex')) return;

  if (COPY_ONLY) return;
  if (!target.classList.contains('fb-hex-link')) return;

  const result = target.textContent;
  GM.openInTab(result, {
    active: true,
    insert: true,
    incognito: PRIVATE,
  });
}

document.addEventListener('click', decodedClicking);