A bookmarklet to copy shared image's source url on Google Photo.

copy-shared-google-photo-image-url.js

javascript: (function() {
  const isSharedPage = url => url.startsWith("https://photos.google.com/share/");

  if (!isSharedPage(location.href)) {
    alert(
      "Cannot run this script.\nTry opening a shared Google Photo page that has following URL.\n\n* https://photos.google.com/share/...\n"
    );
    return;
  }

  const copy = text => {
    const textarea = document.createElement("textarea");
    const selection = document.getSelection();

    textarea.textContent = text;
    document.body.appendChild(textarea);

    selection.removeAllRanges();
    textarea.select();
    document.execCommand("copy");

    selection.removeAllRanges();
    document.body.removeChild(textarea);
  };

  const PARAM = "s0-no";
  const src = document.querySelector('.RY3tic').dataset.latestBg;
  const link = `${src.split("=")[0]}=${PARAM}`;
  copy(link);

})();