Manga downloader for read.amazon.co.jp
// ==UserScript== // @name KindleMangaDownloader // @namespace https://github.com/Timesient/manga-download-scripts // @version 0.9 // @license GPL-3.0 // @author Timesient // @description Manga downloader for read.amazon.co.jp // @icon https://m.media-amazon.com/images/G/01/kfw/mobile/kindle_favicon.png // @homepageURL https://greasyfork.org/scripts/451870-kindlemangadownloader // @supportURL https://github.com/Timesient/manga-download-scripts/issues // @match https://read.amazon.co.jp/manga/* // @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 // ==/UserScript== (async function(axios, JSZip, saveAs, ImageDownloader) { 'use strict'; // collect essential data const { bookInfo, pageAmount } = await new Promise(resolve => { const timer = setInterval(() => { const target1 = document.querySelector('#bookInfo'); const target2 = document.querySelector('#pageInfoCurrentPage'); const target3 = document.querySelector('#pageInfoTotalPage'); if (target1 && target2 && target3 && parseInt(target2.textContent) !== 0 && parseInt(target3.textContent) !== 1) { clearInterval(timer); resolve({ bookInfo: JSON.parse(target1.textContent), pageAmount: parseInt(target3.textContent) }); } }, 200); }); // build parameters const params = { version: '3.0', asin: bookInfo.asin, contentType: 'FullBook', revision: bookInfo.contentGuid, fontFamily: 'Bookerly', fontSize: 4.95, lineHeight: 1.4, dpi: 160, height: 923, width: 400, maxNumberColumns: 2, theme: 'dark', packageType: 'TAR', numPage: -1 * pageAmount, skipPageCount: pageAmount, startingPosition: 0, token: bookInfo.karamelToken.token } // show progress info const infoElement = document.createElement('div'); infoElement.style = `position: fixed; top: 72px; left: 72px; z-index: 999999999; height: 48px; padding: 0 16px; display: flex; justify-content: center; align-items: center; font-size: 14px; font-family: Consolas, Monaco, "Microsoft YaHei"; background-color: #0984E3; color: #FFFFFF; border-radius: 4px;`; infoElement.textContent = `Collected Pages: 0`; document.body.appendChild(infoElement); // get pages let pages = []; for (let i = 0; i < Math.ceil(pageAmount / 100); i++) { const newPages = await getPages({ ...params, numPage: -100, skipPageCount: (i + 1) * 100 }); pages = [].concat(pages, newPages.filter(newPage => !pages.find(page => page.url === newPage.url))); infoElement.textContent = `Collected Pages: ${pages.length}`; } const lastPage = await getPages({ ...params, numPage: 1 }); pages = [].concat(pages, lastPage); infoElement.remove(); // setup ImageDownloader ImageDownloader.init({ maxImageAmount: pages.length, getImagePromises, title: bookInfo.title }); // collect promises of image function getImagePromises(startNum, endNum) { return pages .slice(startNum - 1, endNum) .map(page => getDecryptedImage(page) .then(ImageDownloader.fulfillHandler) .catch(ImageDownloader.rejectHandler) ) } // get decrypted image async function getDecryptedImage(page) { const src = `${page.baseUrl}/${page.url}?${page.authParameter}&token=${encodeURIComponent(bookInfo.karamelToken.token)}&expiration=${encodeURIComponent(bookInfo.karamelToken.expiresAt)}`; const encryptedBuffer = await fetch(src).then(res => res.arrayBuffer()); const decryptedBuffer = await getDecryptedBuffer(encryptedBuffer, bookInfo.karamelToken); return new Blob([decryptedBuffer]); } async function getDecryptedBuffer(t, e) { const n = new TextDecoder('utf-8'); const o = new TextEncoder; const r = n.decode(t); const a = r.slice(0, 24); const c = r.slice(24, 48); const h = r.slice(48, r.length); const l = base64StringToArrayBuffer(a); const d = base64StringToArrayBuffer(c); const u = base64StringToArrayBuffer(h); const g = getKey(e); const v = await window.crypto.subtle.importKey("raw", o.encode(g), { name: "PBKDF2" }, false, ["deriveBits", "deriveKey"]); const p = await window.crypto.subtle.deriveKey({ name: "PBKDF2", salt: l, iterations: 1e3, hash: "SHA-256" }, v, { name: "AES-GCM", length: 128 }, false, ["decrypt"]); return await window.crypto.subtle.decrypt({ name: "AES-GCM", iv: d, additionalData: o.encode(g.slice(0, 9)), tagLength: 128 }, p, u); } function base64StringToArrayBuffer(base64) { const origin = window.atob(base64); const result = new Uint8Array(origin.length); for (let i = 0; i < origin.length; i++) { result[i] = origin.charCodeAt(i); } return result.buffer; } function getKey(t) { if (t.token.length < 100) throw new Error('error in getKey'); const i = t.expiresAt % 60; return t.token.substring(i, i + 40); } // request pages from API async function getPages(params) { const apiURL = `https://read.amazon.co.jp/renderer/render?${new URLSearchParams(params)}`; const tarString = await axios.get(apiURL).then(res => res.data.replaceAll('\u0000', '')); const manifest = JSON.parse(`{` + tarString.match(/"cdnResources".*"acr"/)[0] + `: "acr content" }`); return manifest.cdnResources.map(page => { page.baseUrl = manifest.cdn.baseUrl; page.authParameter = manifest.cdn.authParameter; page.order = parseInt(page.url.replace('resource/rsrc', ''), 36); return page; }).sort((a, b) => a.order - b.order); } })(axios, JSZip, saveAs, ImageDownloader);
