// ==UserScript==
// @name Dynasty Scans Batch Downloader
// @namespace mccranky83.github.io
// @version 2024-10-23
// @description Download doujinshi from Dynasty Scans
// @author Mccranky83
// @require https://cdnjs.cloudflare.com/ajax/libs/jszip/3.10.1/jszip.min.js
// @require https://cdnjs.cloudflare.com/ajax/libs/FileSaver.js/2.0.0/FileSaver.min.js
// @match https://dynasty-scans.com/series/*
// @icon https://www.google.com/s2/favicons?sz=64&domain=dynasty-scans.com
// @grant none
// @license MIT
// ==/UserScript==
class Semaphore {
constructor() {
this.counter = 200;
this.queue = [];
}
async acquire() {
this.counter > 0
? this.counter--
: await new Promise((res) => {
this.queue.push(res);
});
}
release() {
if (this.queue.length > 0) {
this.queue.shift()();
this.counter--;
}
this.counter++;
}
}
(() => {
"use strict";
window.dl = dl;
window.dlAll = dlAll;
const s = new Semaphore();
const h = {
get(tar, key) {
const val = Reflect.get(tar, key);
if (typeof val === "object") return new Proxy(val, h);
else return val;
},
set(tar, key, val) {
Reflect.set(...arguments);
const dl = $("#dl-all");
if (key === "count") {
Reflect.get(tar, key) ? dl.show() : dl.hide();
}
return true;
},
};
const selected = new Proxy({ count: 0, index: [] }, h);
$(".chapter-list dd").each((i, cur) => {
$("<a>", {
href: `javascript:;`,
text: "Download",
class: "label",
}).appendTo(cur);
$("<input>", { type: "checkbox", checked: false }).prependTo(cur);
});
$("dd")
.slice(1)
.find("a:last")
.each((i, cur) => {
$(cur).click(() => {
dl(i + 1, s);
});
});
$(".chapter-list").prepend(`
<dd>
<input type="checkbox">
<span><b>Toggle All</b></span>
</dd>
`);
const $checkbox = $("input[type='checkbox']");
$checkbox.eq(0).on("change", function () {
const checked = $(this).is(":checked");
if (checked) {
const length = $checkbox.length - 1;
selected.count = length;
selected.index = Array.from({ length }, (_, i) => i);
} else {
selected.count = 0;
selected.index = [];
}
$checkbox.slice(1).each((_, cur) => {
$(cur).prop("checked", checked);
});
console.log(JSON.stringify(selected));
});
$checkbox.slice(1).each(function (i) {
$(this).on("change", () => {
if ($(this).prop("checked")) {
selected.count++;
selected.index.push(i);
selected.count === $checkbox.length - 1 &&
$checkbox.eq(0).prop("checked", true);
} else {
selected.count--;
selected.index.splice(selected.index.indexOf(i), 1);
$checkbox.eq(0).prop("checked", false);
}
console.log(JSON.stringify(selected));
});
});
$("<a>", {
href: `javascript:;`,
text: "Download all",
class: "label",
id: "dl-all",
css: {
display: "none",
},
}).appendTo("dd:first");
$("a:contains('Download all')").click(() => {
dlAll(selected, s);
});
})();
async function dl(i, s) {
const dl = $("dd")
.eq(i + 1)
.find("a:last");
const text = dl.text();
dl.text("Loading...");
const zip = new JSZip();
const name =
$(".tag-title b").text() +
"_" +
$("dd")
.eq(i + 1)
.find("a:first")
.text();
const folder = zip.folder(name);
const src =
location.origin + $("dd").slice(1).eq(i).find("a:first").attr("href");
const { pages, iframe } = await getPages(src);
iframe.remove();
await Promise.all(
pages.map(async (page) => {
const url = location.origin + page.image;
const filename = page.image.split("/").slice(-1)[0];
await s.acquire();
await fetch(url, { signal: AbortSignal.timeout(30_000) })
.then((res) => res.arrayBuffer())
.then((res) => {
folder.file(filename, res, { binary: true });
})
.catch(() => {})
.finally(s.release.bind(s));
}),
);
saveAs(
await zip.generateAsync({
type: "blob",
compression: "DEFLATE",
compressionOptions: {
level: 6,
},
}),
name,
);
dl.text(text);
}
async function dlAll(selected, s) {
selected.index.forEach(async (i) => {
await dl(i, s);
selected.count = 0;
selected.index = [];
$("dd input").prop("checked", false);
});
}
async function getPages(src) {
return new Promise((res) => {
const iframe = $("<iframe>", {
src,
css: {
display: "none",
},
});
iframe.appendTo("body");
iframe.on("load", () =>
res({
pages: iframe[0].contentWindow.pages,
iframe,
}),
);
});
}
