humble-bundle.js

(function() {
  sessionStorage.clear();
  const targetNode = document.querySelector('.unredeemed-keys-table');
  if (!targetNode) {
    return;
  }
  const config = { attributes: true, childList: true, subtree: true };

  const steamRegex = /\S{5}-\S{5}-\S{5}(-\S{5}-\S{5})?/;
  const extract = (mutationsList, observer) => {
    const $rows = Array.from(document.querySelectorAll('tr'));
    for (const $r of $rows) {
      const $game = $r.querySelector('.game-name h4');
      const $key = $r.querySelector('.keyfield-value');
      const $steam = $r.querySelector('[class~="hb-steam"]');
      if ($steam) {
        const game = $game.innerText.trim();
        const key = $key.innerText.trim();
        if (steamRegex.test(key)) {
          sessionStorage.setItem(key, game);
        }
      }
    }
    console.log(sessionStorage.length);
  };

  const observer = new MutationObserver(extract);
  extract();
  observer.observe(targetNode, config);

  function remap() {
    const games = Object.keys(sessionStorage)
      .map(key => [sessionStorage.getItem(key), key]);
    games.sort((a, b) => a[0].localeCompare(b[0]));
    return games.map(x => `"${x[0]}","${x[1]}"`).join('\n');
  }
})();