Image gallery as CBZ

Download all images from a gallery page as a CBZ (ZIP) file.
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// ==UserScript==
// @name         Image gallery as CBZ
// @namespace    i2p.schimon.cbz-gallery
// @version      26.04.21
// @description  Download all images from a gallery page as a CBZ (ZIP) file.
// @tag          cbz
// @author       Schimon Jehudah
// @copyright    2026, Schimon Jehudah (http://schimon.i2p)
// @license      MIT; https://opensource.org/licenses/MIT
// @match        *://*/*
// @homepageURL  https://greasyfork.org/scripts/574852-image-gallery-as-cbz
// @supportURL   https://greasyfork.org/scripts/574852-image-gallery-as-cbz/feedback
// @grant        GM.registerMenuCommand
// @grant        GM.xmlHttpRequest
// @connect      *
// @require      https://cdn.jsdelivr.net/npm/[email protected]/umd/index.min.js
// @run-at       context-menu
// ==/UserScript==

const MIN_WIDTH = 100;
const MIN_HEIGHT = 100;
console.log('[GalleryDL] Script v1.5 initialized');

(async function() {
    'use strict';
    console.log('[GalleryDL] Starting download...');
    const imageInfos = getImages();
    if (!imageInfos.length) {
        alert('No images found.');
        return;
    }
    const files = {};
    const imageData = [];
    const seen = new Set();
    let ok = 0, fail = 0, totalSize = 0;
    await Promise.allSettled(imageInfos.map(async (info, i) => {
        try {
            const data = await fetchUint8(info.src);
            let fname = getFilename(info.src, i);
            if (seen.has(fname)) {
                const p = fname.split('.');
                const ext = p.pop();
                fname = `${p.join('.')}_${i}.${ext}`;
            }
            seen.add(fname);
            console.log(`[GalleryDL] Adding: ${fname}`);
            files[fname] = data;

            imageData.push({
                filename: fname,
                url: info.src,
                size: data.length
            });

            totalSize += data.length;
            ok++;
        } catch (e) {
            console.error(`[GalleryDL] Failed ${info.src}:`, e);
            fail++;
        }
    }));
    console.log(`[GalleryDL] Fetched: ${ok} ok, ${fail} failed`);
    if (!ok) {
        alert('All downloads failed. Check console.');
        return;
    }
    console.log('[GalleryDL] Generating metadata files...');
    const metadataText = createMetadataText(ok, totalSize);
    const imagesCsv = createImagesCsv(imageData);

    files['metadata.txt'] = new TextEncoder().encode(metadataText);
    files['images.csv'] = new TextEncoder().encode(imagesCsv);

    console.log('[GalleryDL] Generating ZIP via fflate.zipSync...');
    let zipped;
    try {
        zipped = fflate.zipSync(files);
        console.log(`[GalleryDL] ZIP generated: ${zipped.length} bytes`);
    } catch (e) {
        console.error('[GalleryDL] ZIP generation failed:', e);
        alert('ZIP generation failed. See console.');
        return;
    }
    const blob = new Blob([zipped], {type: 'application/zip'});
    console.log(`[GalleryDL] Final Blob created: ${blob.size} bytes`);
    const name = document.title.replace(/[^a-z0-9]/gi, '_').substring(0, 50) + '_images.cbz';
    downloadBlob(blob, name);
    console.log('[GalleryDL] Done');
})();

function getImages() {
    console.log('[GalleryDL] Scanning DOM...');
    const imgs = Array.from(document.querySelectorAll('img'))
        .filter(img => (img.naturalWidth || img.width) > MIN_WIDTH || (img.naturalHeight || img.height) > MIN_HEIGHT)
        .map(img => ({src: img.src, width: img.naturalWidth || img.width, height: img.naturalHeight || img.height}));
    const links = Array.from(document.querySelectorAll('a[href]'))
        .map(a => a.href)
        .filter(href => /\.(jpg|jpeg|png|gif|webp|bmp|svg)(\?.*)?$/i.test(href))
        .map(href => ({src: href, width: 0, height: 0}));
    const all = [...imgs, ...links].filter((item, idx, arr) =>
        item.src && !item.src.startsWith('data:') && arr.findIndex(i => i.src === item.src) === idx
    );
    console.log(`[GalleryDL] Found ${all.length} unique image URLs`);
    return all;
}
function getFilename(url, index) {
    try {
        const u = new URL(url);
        let name = u.pathname.split('/').pop() || `image_${index}`;
        let ext = name.split('.').pop();
        if (!ext || ext.length > 5) ext = 'jpg';
        name = name.replace(/[^a-zA-Z0-9._-]/g, '_');
        return name.length > 100 ? `image_${index}.${ext}` : name;
    } catch (e) {
        return `image_${index}.jpg`;
    }
}
function fetchUint8(url) {
    console.log(`[GalleryDL] Fetching: ${url}`);
    return new Promise((resolve, reject) => {
        GM.xmlHttpRequest({
            method: 'GET',
            url: url,
            responseType: 'arraybuffer',
            onload: function(r) {
                if (r.status !== 200) {
                    console.error(`[GalleryDL] HTTP ${r.status}: ${url}`);
                    return reject(new Error(`HTTP ${r.status}`));
                }
                const data = new Uint8Array(r.response);
                console.log(`[GalleryDL] OK (${data.length} bytes): ${url}`);
                resolve(data);
            },
            onerror: function(e) {
                console.error(`[GalleryDL] Network error: ${url}`, e);
                reject(e);
            }
        });
    });
}
function downloadBlob(blob, filename) {
    console.log(`[GalleryDL] Triggering download: ${filename} (${blob.size} bytes)`);
    const url = URL.createObjectURL(blob);
    const a = document.createElement('a');
    a.href = url;
    a.download = filename;
    document.body.appendChild(a);
    a.click();
    a.remove();
    URL.revokeObjectURL(url);
    console.log('[GalleryDL] Download triggered');
}
function createMetadataText(imageCount, totalSize) {
    const meta = [];
    meta.push(`Title: ${document.title}`);
    meta.push(`URL: ${window.location.href}`);
    meta.push(`Timestamp: ${new Date().toISOString()}`);
    meta.push(`Images Downloaded: ${imageCount}`);
    meta.push(`Total Size (bytes): ${totalSize}`);

    const desc = document.querySelector('meta[name="description"]');
    if (desc) meta.push(`Meta Description: ${desc.content}`);

    return meta.join('\n');
}
function createImagesCsv(imageData) {
    const lines = ['filename,source_url,size_bytes'];
    imageData.forEach(img => {
        lines.push(`${img.filename},${img.url},${img.size}`);
    });
    return lines.join('\n');
}