// ==UserScript==
// @name 18comic漫画下载
// @namespace http://github.com/eternalphane/Userscripts/
// @version 1.0.6
// @description 从18comic上下载cbz格式(整话阅读)或webp格式(分页阅读)的漫画
// @author eternalphane
// @license MIT
// @match https://18comic.vip/photo/*
// @match https://18comic.org/photo/*
// @match https://jmcomic.me/photo/*
// @match https://jmcomic1.me/photo/*
// @match https://jm-comic1.art/photo/*
// @match https://jm-comic2.art/photo/*
// @match https://jm-comic3.art/photo/*
// @require https://greasemonkey.github.io/gm4-polyfill/gm4-polyfill.js
// @require https://unpkg.com/jszip@3.9.1/dist/jszip.min.js
// @resource css https://raw.githubusercontent.com/eternalphane/UserScripts/master/18comic%20Downloader/overlay.css
// @resource html https://raw.githubusercontent.com/eternalphane/UserScripts/master/18comic%20Downloader/overlay.html
// @grant GM_getResourceText
// @grant GM.getResourceText
// @grant GM_addStyle
// @grant GM.addStyle
// ==/UserScript==
(async () => {
const ICON_DOWNLOAD = 'data:image/svg+xml;base64,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';
const btns = [...document.querySelectorAll('li:has(.fa-bookmark)')].map(liPrev => {
const li = document.createElement('li');
for (const attr of liPrev.attributes) {
li.setAttribute(attr.name, attr.value);
}
const btn = document.createElement('a');
btn.href = '#';
btn.innerHTML = `
<i class="far" style="background:url(${ICON_DOWNLOAD}) center / contain no-repeat"></i>
<span>下载</span>`;
li.appendChild(btn);
liPrev.after(li);
return btn;
});
GM.addStyle(await GM.getResourceText('css'));
const overlay = document.createElement('div');
overlay.id = 'dl-overlay';
overlay.innerHTML = await GM.getResourceText('html');
overlay.hidden = true;
document.body.appendChild(overlay);
const circle = overlay.querySelectorAll('circle')[1];
const number = overlay.querySelector('span');
const msg = overlay.querySelector('h2');
const updateProgress = (percent, text) => {
circle.style.strokeDasharray = `${percent} 100`;
number.innerText = Math.round(percent);
text != undefined && (msg.innerText = text);
};
btns.forEach(btn => btn.addEventListener('click', async e => {
e.preventDefault();
if (!overlay.hidden) {
return;
}
overlay.hidden = false;
document.body.classList.add('noscroll');
const selector = new URLSearchParams(location.search).get('read_mode') === 'read-by-page' ?
'.owl-item .center img' :
'.scramble-page img';
const pages = [...document.querySelectorAll(selector)];
const total = pages.length;
let progress = 0;
updateProgress(0, 'Downloading...');
const zip = new JSZip;
await Promise.all(pages.map(async page => {
try {
zip.file(...await download(page.dataset.original ?? page.dataset.src));
} catch {}
updateProgress(++progress * 100 / total);
}));
updateProgress(0, 'Compressing...');
// TODO: Select output format? (cbz, cbt, pdf)
save(
`${document.querySelector('.panel-heading .pull-left').textContent.trim()}.cbz`,
await zip.generateAsync({
type: 'blob',
compression: 'DEFLATE',
compressionOptions: { level: 9 },
mimeType: 'application/vnd.comicbook+zip'
}, (meta) => updateProgress(meta.percent))
);
document.body.classList.remove('noscroll');
overlay.hidden = true;
}));
})();
/**
* @param {string} url
*/
const download = async url => {
const filename = new URL(url).pathname.split('/').at(-1);
const [id, ext] = filename.split('.');
const img = new Image;
img.src = URL.createObjectURL(await (await fetch(url)).blob());
await new Promise((resolve, reject) => (img.onload = resolve, img.onerror = reject));
const w = img.naturalWidth;
const h = img.naturalHeight;
const canvas = new OffscreenCanvas(w, h);
const ctx = canvas.getContext('2d');
// `aid`, `scramble_id` and `get_num` are both global variables
if (url.includes('.gif') || aid < scramble_id) {
ctx.drawImage(img, 0, 0);
} else {
const num = get_num(btoa(aid), btoa(id));
const rem = h % num;
const sh = Math.floor(h / num);
let sy = h - rem - sh, dy = rem;
ctx.drawImage(img, 0, sy, w, rem + sh, 0, 0, w, rem + sh);
for (let i = 1; i < num; ++i) {
ctx.drawImage(img, 0, sy -= sh, w, sh, 0, dy += sh, w, sh);
}
}
URL.revokeObjectURL(img.src);
// TODO: Select image type? Change quality?
return [filename, await canvas.convertToBlob({
type: {
jpg: 'image/jpeg',
png: 'image/png',
webp: 'image/webp'
}[ext],
quality: 1
})];
};
const save = (filename, blob) => {
const a = document.createElement('a');
a.href = URL.createObjectURL(blob);
a.download = filename;
a.click();
URL.revokeObjectURL(a.href);
};