DMHY Add Download Torrent File Column

DmhyAddDownloadTorrentFileColumn.user.js

// ==UserScript==
// @name        DMHY Add Download Torrent File Column
// @version     1.3
// @namespace   https://yurina.dev/
// @downloadURL https://gist.github.com/yujinlin0224/161893f118dea3fbe6fe3c55ba258d12/raw/DmhyAddDownloadTorrentFileColumn.user.js
// @homepageURL https://github.com/yujinlin0224
// @author      yujinlin0224
// @description DMHY Add Download Torrent File Column
// @include     /^https?://((www|share)\.)?dmhy\.org(/.*)?$/
// @require     https://raw.github.com/emn178/hi-base32/master/build/base32.min.js
// ==/UserScript==

const topicListTable = document.getElementById('topic_list');
if (topicListTable) {
  const topicListTableHeadR = topicListTable.tHead.rows[0];
  const magnetH = topicListTableHeadR.cells[3];
  const torrentH = magnetH.cloneNode(true);
  torrentH.width = '45px';
  torrentH.innerHTML = '<span class="title">Torrent</span>';
  topicListTableHeadR.insertBefore(torrentH, magnetH);
  const magnetBase32Regexp = /^magnet:\?xt=urn:btih:([A-Z2-7=]+)/g;
  const topicListTableBodyRs = topicListTable.tBodies[0].rows;
  for (const topicListTableBodyR of topicListTableBodyRs) {
    const date = topicListTableBodyR.cells[0].children[0].innerText.split(' ')[0];
    const magnetD = topicListTableBodyR.cells[3];
    const magnetMatched = magnetD.children[0].href.matchAll(magnetBase32Regexp).next();
    if (magnetMatched.value) {
      const magnetBase32 = magnetMatched.value[1];
      const magnetHex = Array.from(
        base32.decode.asBytes(magnetBase32), (b) => ('0' + b.toString(16)).slice(-2),
      ).join('');
      const torrentD = magnetD.cloneNode(true);
      const torrentA = torrentD.children[0];
      torrentA.classList.replace('arrow-magnet', 'arrow-torrent');
      torrentA.href = `https://dl.dmhy.org/${date}/${magnetHex}.torrent`;
      torrentA.title = 'Torrent';
      topicListTableBodyR.insertBefore(torrentD, magnetD);
    } else {
      topicListTableBodyR.insertBefore(magnetD.cloneNode(false), magnetD);
    }
  }
}