Userscript to download all images in a Gallerix.org set

gallerix-scraper.user.js

// ==UserScript==
// @name         Gallerix Scraper
// @namespace    http://andrewkidd.co.uk/
// @version      0.1
// @description  Batch grab gallerix images
// @author       You
// @match        https://gallerix.org/storeroom/*
// @match        https://gallerix.org/pic/*
// @icon         https://www.google.com/s2/favicons?sz=64&domain=gallerix.org
// @grant        GM_openInTab
// @grant        GM_download
// @grant        window.close
// ==/UserScript==

(function() {
    'use strict';
    const sleep = seconds => new Promise(r => setTimeout(r, seconds * 1000));

    function log(message) {
        console.log('[gallerix-scraper]', message)
    }

    // click the show all/load more button if not already clicked
    function showAllInGallery() {
        while (document.querySelector('button#lazy').style.display != 'none') {
            document.querySelector('button#lazy').click()
        }
    }

    // get all links that go to images in this storeroom
    async  function getAllGalleryLinks() {
        var linkCollection = document.getElementsByTagName('a');
        var storeroomId = window.location.href.match(/storeroom\/([0-9]+)\//)[1];
        for(var i = 0; i < linkCollection.length; i++){
            var link = linkCollection[i].href;
            if (link.includes(`${storeroomId}/N`)) {
                log(`${link}?gallerix-scraper`);
                GM_openInTab(`${link}?gallerix-scraper`);
                await (1);
            }
        }
    }

    if (window.location.href.startsWith('https://gallerix.org/pic/') && window.location.hash.startsWith('#gallerix-scraper=')) {
        log('Raw Image! Downloading');

        var downloadInfo = {
            url: document.querySelector('a').href,
            name: decodeURI(window.location.hash.split('#gallerix-scraper=')[1])
        };
        log(downloadInfo);
        GM_download(downloadInfo);
        window.close();
    } else if (document.querySelectorAll('div.tab-content div.pic').length) {
        log('Gallery Page! Adding download button');

        // add download button
        document.querySelector('ul.nav-tabs').insertAdjacentHTML('beforeEnd', '<li><a class="nav-link" id="gallerix-scraper" href="#"><i class="icon fa fa-download"></i></a></li>');

				// wait for user to click download button
				document.querySelector('a#gallerix-scraper').addEventListener('click', function() {
					showAllInGallery();
					getAllGalleryLinks();
				});
    } else if (window.location.href.endsWith('?gallerix-scraper') && document.querySelectorAll('div.tab-content p.xpic').length) {
        log('Image View! Scraping raw image link');
        var artworkTitle = document.title;
        var artworkLink = document.querySelector('a#axpicd');
        var tmp = artworkLink.href.split('.');
        var filename = `${artworkTitle}.${tmp[tmp.length-1]}`
        log(`${artworkTitle} - ${artworkLink.href}`);
        artworkLink.href = `${artworkLink.href}#gallerix-scraper=${filename}`;
        artworkLink.click();
        window.close();
    }
})();