[500px sorder] Snipper for sorting 500px private gallery in photo id order #500px

snippet.js

(async () => {
  const galleryId = (() => {
    const m = /^\/g\/(\w+)$/.exec(location.pathname);
    if (!m) {
      throw new Error("Invalid location (not a private gallery)");
    }
    return m[1];
  })();
  const userId = window.currentUser.id;
  const csrfToken = window.PxApp.csrf_token;
  const itemsURL = `https://api.500px.com/v1/users/${userId}/galleries/${galleryId}/items`;

  async function loadPage(page = 1) {
    const rpp = 50;
    const itemsURL = `${itemsURL}?rpp=${rpp}&page=${page}`;
    const res = await fetch(itemsURL).then(r => r.json());
    if (res.error) {
      throw new Error(`Invalid response: ${res.error}`);
    }
    const { photos, current_page, total_pages } = res;

    if (current_page < total_pages) {
      const nextPhotos = await loadPage(current_page + 1);
      return [...photos, ...nextPhotos];
    }
    return photos;
  }

  async function moveToBegin(photoId) {
    const res = await fetch(itemsURL, {
      method: "PUT",
      body: JSON.stringify({
        add: {
          after: { id: null },
          photos: [photoId]
        }
      }),
      headers: {
        "Content-Type": "application/json",
        "X-CSRF-Token": csrfToken
      },
      credentials: "include"
    }).then(r => r.json());

    if (res.error) {
      throw new Error(`Invalid response: ${res.error}`);
    }
  }

  const photosIds = (await loadPage()).map(photo => photo.id);
  photosIds.sort();
  photosIds.reverse();

  for (let i = 0; i < photosIds.length; i++) {
    console.log(`⌛ ${i + 1}/${photosIds.length}...`);
    await moveToBegin(photosIds[i]);
  }

  console.log("✔ Done");
})();