Quick and dirty Node script for downloading and packaging CBZ archives from Mangazuki.

mangazuki-downloader.js

const child_process = require('child_process');
const https = require('https');
const fs = require('fs');

function get(url) {
    console.log('Get ' + url);
    return new Promise((resolve, reject) => {
        const req = https.request(url, {
            headers: {
                'User-Agent': 'Mozilla/5.0 (Macintosh; Intel Mac OS X x.y; rv:10.0) Gecko/20100101 Firefox/10.0'
            }
        }, async res => {
            if(res.statusCode == 301 || res.statusCode == 302) {
                console.log('Redirected to ' + res.headers.location);
                const result = await get(res.headers.location);
                resolve(result);
                return;
            }
            let data = new Buffer.from('');
            res.on('data', d => {
                data = Buffer.concat([ data, d ]);
            });
            res.on('end', d => {
                resolve(data);
            });
            res.on('error', error => {
                console.error(error);
                reject(error);
            });
        });
        req.on('error', error => reject(error));
        req.end();
    });
}

const manga_slug = process.argv[2];
const manga_url = 'https://mangazuki.me/manga/' + manga_slug + '/';

get(manga_url).then(async data => {
    const regexp = new RegExp('class="wp-manga-chapter.+?href="(.+?)"', 'igms');
    let m;
    while((m = regexp.exec(data)) != null) {
        if(m.index === regexp.lastIndex) {
            regexp.lastIndex++;
        }
        const ch_data = await get(m[1]);
        const chapter_number = m[1].match(/-chapter(\d+)/im)[1];
        console.log('Chapter ' + chapter_number);
        const ch_regexp = /id="image-.+?".+?src="(.+?)"/igm;
        let ch_m;
        while((ch_m = ch_regexp.exec(ch_data)) != null) {
            if(ch_m.index == ch_regexp.lastIndex) ch_regexp.lastIndex++;
            const image_name = ch_m[1].match(/.+\/([^\/]+)$/ims)[1];
            const image_data = await get(ch_m[1]);
            if(!fileExists(manga_slug + '/' + chapter_number + '/' + image_name)) {
                saveImage(image_data, chapter_number, image_name);
            }
        }

        child_process.execSync('zip -r -y ' + manga_slug + '/' + manga_slug + '-' + chapter_number + '.cbz ' + manga_slug + '/' + chapter_number);
        child_process.execSync('rm -rf ' + manga_slug + '/' + chapter_number);
    }
});

function saveImage(data, chapter, image) {
    const path = manga_slug + '/' + chapter + '/' + image;
    createDirectory(manga_slug);
    createDirectory(manga_slug + '/' + chapter);
    fs.writeFileSync(path, data);
}

function fileExists(path) {
    try {
        fs.accessSync(path);
    } catch(err) {
        return false;
    }
    return true;
}

function createDirectory(path) {
    if(!fileExists(path)) {
        fs.mkdirSync(path);
    }
}