Facebook HEX

Convert HEX to text, in a post or comment on Facebook.
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// ==UserScript==
// @name            Facebook HEX
// @name:vi         Facebook HEX
// @namespace       https://lelinhtinh.github.io
// @description     Convert HEX to text, in a post or comment on Facebook.
// @description:vi  Chuyển đổi HEX thành URL hoặc text, trong bài viết hoặc bình luận trên Facebook.
// @version         1.0.0
// @icon            https://i.imgur.com/oz5CjJe.png
// @author          lelinhtinh
// @oujs:author     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
// @noframes
// @supportURL      https://github.com/lelinhtinh/Userscript/issues
// @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;

/* === DO NOT CHANGE === */
function fallbackCopyTextToClipboard(text) {
  let textArea = document.createElement('textarea');
  textArea.value = text;

  textArea.style.top = '0';
  textArea.style.left = '0';
  textArea.style.position = 'fixed';

  document.body.appendChild(textArea);
  textArea.focus();
  textArea.select();

  try {
    document.execCommand('copy');
  } catch (err) {
    console.error('Fallback: Oops, unable to copy', err);
  }

  document.body.removeChild(textArea);
}

function copyTextToClipboard(text) {
  if (!navigator.clipboard) {
    fallbackCopyTextToClipboard(text);
    return;
  }

  navigator.clipboard.writeText(text).catch((err) => {
    console.error('Async: Could not copy text', err);
  });
}

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;

  copyTextToClipboard(result);

  post.innerHTML = post.innerHTML.replace(
    content,
    `
<strong
  class="fb-hex${validURL(result) ? ' fb-hex-link' : ''}"
  title="Copied to clipboard${COPY_ONLY ? '' : '\nClick 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) {
  const target = e.target;

  if (target.getAttribute('role') === 'button') return;
  const role = target.closest('[role]');
  if (role.getAttribute('role') !== 'article') return;

  const post = target.closest('p, span, [dir="auto"], [data-ft] > div[style]');
  if (post === null) return;

  const parent = post.parentNode;
  if (parent.querySelector('.word_break') !== null) {
    handle(parent);
    return;
  }

  handle(post);
}

document.addEventListener('click', getPost);

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

  const result = target.textContent;
  copyTextToClipboard(result);

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

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

document.addEventListener('click', decodedClicking);