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ZerosumonlineDownloader

Manga downloader for zerosumonline.com

// ==UserScript==
// @name         ZerosumonlineDownloader
// @namespace    https://github.com/Timesient/manga-download-scripts
// @version      0.3
// @license      GPL-3.0
// @author       Timesient
// @description  Manga downloader for zerosumonline.com
// @icon         https://www.google.com/s2/favicons?sz=64&domain=zerosumonline.com
// @homepageURL  https://greasyfork.org/scripts/478375-zerosumonlinedownloader
// @supportURL   https://github.com/Timesient/manga-download-scripts/issues
// @match        https://zerosumonline.com/*
// @require      https://unpkg.com/[email protected]/dist/axios.min.js
// @require      https://unpkg.com/[email protected]/dist/jszip.min.js
// @require      https://unpkg.com/[email protected]/dist/FileSaver.min.js
// @require      https://update.greasyfork.org/scripts/451810/1398192/ImageDownloaderLib.js
// @grant        GM_info
// @grant        GM_xmlhttpRequest
// @grant        unsafeWindow
// ==/UserScript==

(async function(axios, JSZip, saveAs, ImageDownloader) {
  'use strict';

  // reload page when enter or leave chapter
  const re = /https:\/\/zerosumonline\.com\/episode\/.*\/chapter\/.*/;
  const oldHref = window.location.href;
  const timer = setInterval(() => {
    const newHref = window.location.href;
    if (newHref === oldHref) return;
    if (re.test(newHref) || re.test(oldHref)) {
      clearInterval(timer);
      window.location.reload();
    }
  }, 200);

  // return if not reading chapter now
  if (!re.test(oldHref)) return;

  // get chapter ID
  const chapterId = await new Promise(resolve => {
    const timer = setInterval(() => {
      if (unsafeWindow.self && unsafeWindow.self.__next_f) {
        clearInterval(timer);
        resolve(unsafeWindow.self.__next_f.flat().join('').match(/"decodedChapterId":"(?<id>\d+)"/).groups.id);
      }
    }, 200);
  });

  // get title and urls
  const title = document.title.split('|')[1] + ' ' + document.title.split('|')[0];
  const imageURLs = await axios
    .post(`https://api.zerosumonline.com/api/v1/viewer?chapter_id=${chapterId}`)
    .then(res => res.data)
    .then(data => data.match(/https:\/\/contents\.zerosumonline\.com\/chapter_page\/\d+\/\d+\.webp/g))
    .then(matchResult => Array.from(matchResult));

  // setup ImageDownloader
  ImageDownloader.init({
    maxImageAmount: imageURLs.length,
    getImagePromises,
    title
  });

  // collect promises of image
  function getImagePromises(startNum, endNum) {
    return imageURLs
      .slice(startNum - 1, endNum)
      .map(url => axios.get(url, { responseType: 'arraybuffer' })
        .then(res => res.data)
        .then(ImageDownloader.fulfillHandler)
        .catch(ImageDownloader.rejectHandler)
      );
  }

})(axios, JSZip, saveAs, ImageDownloader);