Download all links in selected text

download.js

(async () => {
  // Defaults that usually work, but change to fit your need.
  const delayMs = 1000; // delay between links (milliseconds), it should be at least 1/3 the time to download a file
  const allow = /\.(pdf|zip|mp3)(\?|#|$)/i; // Restrict to certain file types

  // === Nothing to change after this ===
  
  const sel = window.getSelection();
  if (!sel || sel.rangeCount === 0) {
    alert('Select some content on the page first.');
    return;
  }

  // Clone the selection to a detached fragment so we can safely query it
  const frag = sel.getRangeAt(0).cloneContents();

  // 1) Links from <a.
  const anchorUrls = Array.from(frag.querySelectorAll('a[href]'))
    .map(a => a.href);

  // 2) Plain-text URLs inside the selection (e.g., “https://example.com/file.pdf”)
  const text = (frag.textContent || '');
  const plainUrls = Array.from(text.matchAll(/\bhttps?:\/\/[^\s"'<>]+/gi)).map(m => m[0]);

  // Merge & de-duplicate
  const urls = Array.from(new Set([...anchorUrls, ...plainUrls]))
    .filter(u => /^https?:\/\//i.test(u));

  if (urls.length === 0) {
    alert('No links found in the selection.');
    return;
  }

  const urlsFiltered = urls.filter(u => allow.test(u));
  const targets = urlsFiltered.length ? urlsFiltered : urls;
  
  const inferName = (url, i) => {
    const raw = url.split('/').pop().split('#')[0].split('?')[0];
    const name = decodeURIComponent(raw || '');
    return name || `download-${i + 1}`;
  };

  // Try to trigger download via <a download>. This generally works best for
  // same-origin or when the server allows it; some cross-origin links may open in a tab.
  const sleep = (ms) => new Promise(res => setTimeout(res, ms));
  let ok = 0;
  for (let i = 0; i < urls.length; i++) {
    const url = urls[i];
    const a = document.createElement('a');
    a.href = url;
    a.download = inferName(url, i); // browsers may ignore for cross-origin, but it's a hint
    a.rel = 'noopener';
    a.style.display = 'none';
    document.body.appendChild(a);

    // Trigger the download
    a.click();
    a.remove();

    ok++;
    // Wait between downloads
    await sleep(delayMs);
  }


  console.log(`Attempted downloads: ${count}, but sometimes you can only download about 20 files each time.\n`, targets);
})();