// ==UserScript==
// @name melonbooks图源获取
// @namespace summer-script
// @version 0.6
// @description melonbooks阅读器图源自动下载
// @author summer
// @match https://www.melonbooks.co.jp/viewer/*
// @match https://www.melonbooks.co.jp/fromagee/viewer/*
// @icon https://www.melonbooks.co.jp/favicon.ico
// @license GPL-3.0
// @grant unsafeWindow
// @grant GM_xmlhttpRequest
// @grant GM_download
// @connect cloudfront.net
// ==/UserScript==
(function () {
'use strict';
// 界面按钮
var ui = {
btn: null,
appendStartBtn: function () {
var btn = document.createElement('button');
btn.innerText = '下载图源';
btn.style.position = 'fixed';
btn.style.top = '20px';
btn.style.right = '20px';
btn.style.zIndex = '10001';
btn.style.padding = '8px';
btn.style.background = '#fff';
btn.style.border = '1px solid #aaa';
btn.style.borderRadius = '4px';
btn.style.minWidth = '112px';
btn.style.color = '#000';
document.body.appendChild(btn);
this.btn = btn;
},
btnClick: function (callback) {
var btn = this.btn;
btn.onclick = function () {
callback(btn);
};
},
updateBtnText: function (text) {
this.btn.innerText = text;
}
};
// 加载图像, 获取书籍相关参数
var loader = {
checkValidity: function () {
if (!unsafeWindow.GUARDIAN_SERVER) {
return false;
}
if (!unsafeWindow.book_data) {
return false;
}
if (!unsafeWindow.pages_data) {
return false;
}
if (!unsafeWindow.pages_data.keys) {
return false;
}
return true;
},
checkVersion: function () {
var verSupport = [0, 3, 4, 5];
var bookData = pageUtil.getBookData();
var verCurrent = bookData.version;
if (!verCurrent) {
verCurrent = 0;
}
return verSupport.includes(verCurrent);
},
getPageKey: function (page) {
return unsafeWindow.pages_data.keys[page - 1];
},
getMaxPage: function () {
return pageUtil.getBookData().page_count;
},
getBookName: function () {
var bookName = pageUtil.getBookData().title;
if (!bookName) {
bookName = document.title;
}
return bookName;
},
loadPage: function (page, callback) {
var img = new Image();
var imgKey = this.getPageKey(page);
if (callback) {
img.onload = function () {
callback(img, imgKey);
};
}
imgUrlUtil.getImageUrl(page).then(function (imgSrc) {
// console.log(imgSrc);
GM_xmlhttpRequest({
method: 'GET',
url: imgSrc,
responseType: 'blob',
onload: function (resp) {
fileDecryptor.decrypt(resp.response, imgKey).then(function (fileBlob) {
img.src = URL.createObjectURL(fileBlob);
});
}
});
});
}
};
// 绘制并下载正确的图像
var render = {
canvas: null,
ctx: null,
drawImage: function (img, coorArr) {
var canvas = document.createElement('canvas');
canvas.width = img.naturalWidth;
canvas.height = img.naturalHeight;
var ctx = canvas.getContext('2d');
this.drawOrigin(ctx, img, coorArr);
URL.revokeObjectURL(img.src);
this.canvas = canvas;
this.ctx = ctx;
},
downloadImage: function (filename) {
if (!this.canvas) {
return;
}
var fullname = filename + '.png';
this.canvas.toBlob(function (blob) {
if (!blob) {
console.log("blob null");
return;
}
var blobURL = URL.createObjectURL(blob);
GM_download({
name: fullname,
url: blobURL,
onload: function () {
URL.revokeObjectURL(blobURL);
},
});
});
},
drawOrigin: function (ctx, img, coorArr) {
var blockEachLine = Math.floor(img.naturalWidth / 96);
ctx.drawImage(img, 0, 0);
for (var i = 0; i < coorArr.length; i++) {
var dstX = Math.floor(coorArr[i] % blockEachLine) * 96;
var dstY = Math.floor(coorArr[i] / blockEachLine) * 128;
var srcX = Math.floor(i % blockEachLine) * 96;
var srcY = Math.floor(i / blockEachLine) * 128;
ctx.drawImage(img, srcX, srcY, 96, 128, dstX, dstY, 96, 128);
}
}
};
// 原网页复制过来的洗牌方法
// 每页对应一个key, key作为随机种子还原真实顺序
var randomizer = {
PARAM_A: 1103515245,
PARAM_B: 12345,
RAND_MAX: 32767,
init: function (e) {
this.next = this._str_to_int(e);
},
rand: function (t) {
var n;
return null != t ? (n = t + 1,
Math.floor(this._next_int() / (Math.floor(this.RAND_MAX / n) + 1))) : this._next_int();
},
shuffle: function (e) {
var t, n, i, r, o, s;
o = [].concat(e);
r = o.length;
for (t = i = 0; 0 <= r ? i < r : i > r; t = 0 <= r ? ++i : --i)
n = this.rand(o.length - 1),
s = o[n],
o[n] = o[t],
o[t] = s;
return o;
},
_next_int: function () {
this.next = (this.next * this.PARAM_A + this.PARAM_B) % (this.RAND_MAX + 1);
return this.next;
},
_str_to_int: function (e) {
var t, n, i, r, o, s;
if (s = 0,
null != e)
for (t = e.split(""); t.length > 0;)
n = t.shift(),
i = t.shift(),
r = n.charCodeAt(0),
o = 0,
i && (o = i.charCodeAt(0)),
s += r << 8 | o;
return s;
},
getImgCoorArr: function (img) {
var o = Math.floor(img.naturalWidth / 96);
var s = Math.floor(img.naturalHeight / 128);
var r = [];
for (var l = 0; l < o * s; ++l) {
r.push(l);
}
return this.shuffle(r);
}
};
var imgUrlUtil = {
getImageUrl: async function (page) {
var bookData = pageUtil.getBookData();
var imgExt = this.getFileExt();
var urlPath = await this.getImageUrlPath(page);
var url = unsafeWindow.GUARDIAN_SERVER + '/';
url += bookData.s3_key;
url += urlPath + '.' + imgExt;
return url;
},
getFileExt: function () {
var bookData = pageUtil.getBookData();
var imgExt = 'jpg';
if (bookData.image_extension) {
imgExt = bookData.image_extension;
}
return imgExt;
},
getImageUrlPath: async function (page) {
var bookData = pageUtil.getBookData();
var path = page;
if (bookData.page_salt) {
path = await this.fileHashName(bookData.page_salt, page);
}
return path;
},
fileHashName: async function (e, n) {
// e => salt
// n => page index
const t = new TextEncoder;
n = t.encode(n),
e = t.encode(e),
e = await crypto.subtle.importKey("raw", e, {
name: "HMAC",
hash: {
name: "SHA-256"
}
}, !1, ["sign"]),
e = await crypto.subtle.sign("HMAC", e, n);
{
n = e;
let t = "";
var i = new Uint8Array(n)
, o = i.byteLength;
for (let e = 0; e < o; e++)
t += String.fromCharCode(i[e]);
return btoa(t).replace(/=/g, "").replace(/\+/g, "-").replace(/\//g, "_")
}
}
};
var pageUtil = {
bookData: null,
getScript: function () {
var script = null;
document.body.querySelectorAll("script").forEach(function (dom) {
if (!script && dom.innerHTML.includes('GUARDIAN_SERVER')) {
script = dom.innerHTML;
}
});
return script;
},
getBookData: function () {
if (this.bookData) {
return this.bookData;
}
var script = this.getScript();
var reg = /book_data\s*=\s*(\{.+?\});/;
var match = reg.exec(script);
if (!match) {
return unsafeWindow.book_data;
}
var bookData = JSON.parse(match[1]);
if (
bookData.s3_key &&
bookData.s3_key[bookData.s3_key.length - 1] !== "/"
) {
bookData.s3_key += "/";
}
this.bookData = bookData;
return this.bookData;
}
};
var fileDecryptor = {
aesKey: null,
decrypt: async function (fileBlob, pageKey) {
var bookData = pageUtil.getBookData();
if (this.isEncrypted()) {
var aesKeyEncrypt = bookData.crypto.data.web;
fileBlob = await this.aesDecrypt(fileBlob, aesKeyEncrypt, pageKey);
}
return fileBlob;
},
aesDecrypt: async function (fileBlob, aesKeyEncrypt, pageKey) {
var pageKeyArr = (new TextEncoder()).encode(pageKey);
var aesKey = await this.decryptAesKey(aesKeyEncrypt);
var aesKeyHash = await this.hmacSha256(aesKey, pageKeyArr);
var aesKeyC = await window.crypto.subtle.importKey("raw", aesKeyHash, {
name: "AES-CTR",
length: 256
}, false, ["decrypt"]);
var counter = await fileBlob.slice(16, 32).arrayBuffer();
var fileDataBlob = await fileBlob.slice(32).arrayBuffer();
var fileDataDecrypt = await window.crypto.subtle.decrypt({
name: "AES-CTR",
counter: counter,
length: 128
}, aesKeyC, fileDataBlob);
return new Blob([fileDataDecrypt], {
type: this.getFileMimeType()
});
},
decryptAesKey: async function (cipherText64) {
if (this.aesKey) {
return this.aesKey;
}
var rsaKey = 'MIIJQgIBADANBgkqhkiG9w0BAQEFAASCCSwwggkoAgEAAoICA'
+ 'QCy66NYR5lCYGB/bztf+l6V+lZWABTY0sHpWkAway66OKeBm8'
+ '+yubPSMDtyvu0xCM+WsZz8a35EEOsm1BvQquIWm26pUtQofNX'
+ 'cwOQg9yIhZDiii51dzrVKjBMOQwu6ANpwJT/7y241fEfYpzwg'
+ 'HycYPvVjp52PIFsBP68SjABuht+jnfVUhYWb8XhmnznJc8tG/'
+ 'PArhj0UHOX8TiA/4KkAZ2icnAkO5nSBqTSxBzgJfvdZuKtOdH'
+ '5LWXmrhkfKljmk0SbzjWloZXr1c2UmUxA0Tl/PkVrfCu5MbN1'
+ 'u+TWLyJysVj7YtcytnOONg3BYI/icW0pfk/u+kH7Olkp5UaQI'
+ 'duWQuy7DY/Wa2j54PE/AwWmpigDcT2lEOBj6HJv7tWhh0NLTe'
+ 'vOt/VFoAtfmdVRkDiKtQXGvLQ2WSGfydOrBzEghAO2iPJA2C+'
+ 'u8LkEsee2A4OOVoSvW+YujpkjflEM1NY0OI0SbtvQEjUCoqKN'
+ 'a6n6ynyx0i1+n3fWMYk86wGFUEBaCgNsY8tZaCMPrKZdvBFgG'
+ 'gFLZSRBwBWTs9UUtaO/jTskqgQboAJoT7EucuyEePrYc5t+66'
+ 'NUEajFLqsyMlVedG8nT/wxtAsfDShNDeFXfJ8uaRulMRZCK6E'
+ 'GVuYY2lts6aQ7AQ5Y6bdb36uN4YjR3qzfHnk1oI8iSCzqjGwI'
+ 'DAQABAoICAB6qA/S9UKbvnZo5lhN89Xj+zo0utmPyuwkjTpz9'
+ 'waRo0UyFR7N54DfFzGp+Dmi4+dr51c3tHlbMD4E4GQxKPTVir'
+ 'jSW3YWS35RV+sMrl83hP1OcWfwZ0ThViW6ITxoxyz4tJCojU2'
+ 'AXTLj08HkQ3cJqB+RsdbRx9ybfo0GqfOh0dR+1krZJq/xuBh'
+ 'SQdXbxQYWJFCBhgVZRHZmASkaoWk6XanZsx6CmHpGaTk2Izz'
+ 'HRcNMPs0xe6sY/L3sWKHewB3EX53UWZ1pdChXHES7gTYapaA'
+ 'JLByfy16SBg/HhBCxQ1YkzvtGlVs7qdJVsUXTJtXIWs0huNF'
+ 'cUrKb7Wwgv1czTWrdekxx/0oOi91pH37nhfcOgYxYFZSoGtv'
+ 'QpylhVBhcgKy7xvhHq4zDl6vOjvuDaeSiLEtha4wIwavjBTi'
+ 'rSUosGUtplvuILZt+EiP9ynEyoZa+1C6LrJ2X9bO+K8cpxYh'
+ 'WWGHtwm7scICovNwvO3lciOE60LW/wgL9ZnGuCuq06QuCh2S'
+ 'kIZpTIlJuxVsgAP9vZjgLgUAh+fFZ/sTV6K/34baTsGKavPC'
+ 'Qo4GWADxqLlGROdFXPbApDsiSbUfQZlkjquh1Cjzuzm0cno/'
+ '5WY15kTX4Vj+u2/UMSwx8Bc4in8nwa750csFt7+uihrbxhcD'
+ 'ZwO1AeW9vQt7aSgl0BAoIBAQD5dv4JXmpUXvjTkx+h26YdHZ'
+ 'I9mFKd9s+rX4KvaQQrCkcqgChmFleiM81LlM+Wn5vm39pI7W'
+ '/JZ08blA6F5eFRvYQvBu1kHU+ubZLRqna4DzcXaPWo3T8B+9'
+ '7J1knH7axief0YoksD6eoTMqvqq4CVsWok7KG0Hs/7/Q8oID'
+ 'lt4IiMYZtZmuEgPeEGSVpsDmWRp9VshljiQigOvAnu3TNrSf'
+ 'OpFzPFIUzJ3Mpo0kiFJsljfSJolozBb7zHQGUcjBlyDVkQOZ'
+ 'kcxhLOm+Nvh3imDGdKhRjm22szGjg6+g0LOfH3qxKcaJ1dl7'
+ 'fBsvXY8AsEUCQCCSiVOjl2hB293tjVAoIBAQC3m4xIjKGQVx'
+ 'ng24us0uD+7SjYSh++r15mC//MDENoH9U4I6VRGoTUb2MT+8'
+ 'KpCr1dXnhvgUCI86e8NWnacIsiWc6T9Iwrv02yn3Zphdgi99'
+ 'T8HXLe4tVxIISRn4JKevkSPfBmNfj4h0iccQjKVsf2fDBlec'
+ 'kTJcOCC9H1uLwNzb3ot+/MOWfsfwKCoR+Ob6lhATzloBfHYK'
+ '29qSNMP2FMYklBgp3lhl0KL1osk/yt2aJJvhYkvoHxYcbpxP'
+ 'NghKgd8q/3EpnGRmRZktTY1VHg1cIVKgGrljzP4yFyD7Lg7f'
+ 'PEftUT249KVjXPXkAkZ2/wNAKxh5fi4ELP1LLK94QvAoIBAE'
+ 'DlhLa5Oh4SytZ3ip4XvwIKBFZDvxJa97FUWnH5dt0fgl37Ew'
+ 'djvo5yvXBxGQPNJ8iK6YVZR2B0oK7C+Hg60j/qdm2pdq45td'
+ 'XhqXUjzFiblLBhXK7+R3rjpBSLy4vYN6UyqPX0mmE9Q+iUoQ'
+ 'aecQgALGXIrVRnQ6IBNiUxJN+BruQeLETGNtSlZFm3UW+U2z'
+ 'VmHO5rkMnjffo/TrI2Fz9M8LdHUu9wd0J4TquwMK965J8eGY'
+ 'ptx9Y2lDydcvBXPfNep5HB+iPzH0diZGtKKcfAqEpJj63W3O'
+ '9hXclx7VzDSUAt39ySloWXh3U7chtqbuNDWeqxqT4Q9IvxWK'
+ '9hPrUCggEBAKYoyYp6YlgKyyuX485yRRXPMFCUvCfH8ujs4Q'
+ 'Aa9QGNFVupvpkoI59QclyKUT7Drl2J+foHAY0u29RSjkoV4Y'
+ 'Qju/Rfsl6A0OLetr2GV/RFTmUejW8x3rFzGSXkMXgP08nzbd'
+ 'RB8d+QJmEVVjwuzuW8u9uJnDOM0GKnKcpy9RSU5dFubD/oj6'
+ 'kRxAbNo442dRWJlj/EYuCXGIR0RbJiBT6oD92ORDCMKTTnZ3'
+ 'bCMkBunRSZRtbX5Sa6MtYp24q0YqQ/lYlGNw2ddIEvhRn56x'
+ 'BKwkp+6mYLH1uPFBxyIpK2JQ3lLhW7c/B1Fltk0y1ewomht/'
+ 'JLYGP8Sdplhaxy1RcCggEADPWAt8alVeV1aUYYD2xMfjwO3V'
+ 'D6fDp5s//tXtJtnfXOiE9eQ70XYks4MlrOgR5vKqmPWREdVu'
+ '+2wIT9VNUzBixPZecSVuk4JhH11saTxql+4Q6pb7rii4tocS'
+ 'pzQg5p+bqXgiCjICLZsYXb0A4f5LswWB+APVQOTyN3k7NEfP'
+ 'MXZq2VDuNWuP9+df097625iAAY9B05X06emTySzKPr7oA4Fd'
+ 'ui6GbzdZmuKoXDgBCo4mDtJ5zMqqa22pmMTHb1kTNpIGlILM'
+ 'Pg3/7Q42gvtqsXFWeJQmbRoiMakrTURt1y+n+br4vjUSubFc'
+ 'Qi5Wa3DymTfNsvcXVG+/n3OOEIoQ==';
var pk = await window.crypto.subtle.importKey(
"pkcs8",
this.base64ToUint8(rsaKey),
{ name: "RSA-OAEP", hash: { name: "SHA-256" } },
false,
["decrypt"]
);
this.aesKey = await window.crypto.subtle.decrypt(
{ name: "RSA-OAEP" },
pk,
this.base64ToUint8(cipherText64)
);
return this.aesKey;
},
base64ToUint8: function (n) {
const t = window.atob(n);
var r = t.length;
const e = new Uint8Array(r);
for (let n = 0; n < r; n++) {
e[n] = t.charCodeAt(n);
}
return e.buffer;
},
hmacSha256: async function (key, data) {
var keyC = await crypto.subtle.importKey("raw", key, {
name: "HMAC",
hash: { name: "SHA-256" }
}, false, ["sign"]);
return crypto.subtle.sign("HMAC", keyC, data);
},
getFileMimeType: function () {
var mimeType = 'image/jpeg';
var bookData = pageUtil.getBookData();
if (bookData.image_mime_type) {
mimeType = bookData.image_mime_type
}
return mimeType;
},
isEncrypted: function () {
var bookData = pageUtil.getBookData();
return bookData.crypto && bookData.crypto.type === 1;
}
};
var downloader = {
downloadImg: function (img, imgKey, fileName) {
if (fileDecryptor.isEncrypted()) {
var blobURL = img.src;
var fullname = fileName + '.' + this.getFileExtByMimeType();
// v5版本文件加密但是不打乱
GM_download({
name: fullname,
url: blobURL,
onload: function () {
URL.revokeObjectURL(blobURL);
},
});
} else {
randomizer.init(imgKey);
var imgCoor = randomizer.getImgCoorArr(img);
render.drawImage(img, imgCoor);
render.downloadImage(fileName);
}
},
getFileExtByMimeType: function () {
var bookData = pageUtil.getBookData();
var ext = 'png';
var map = {
'image/png': 'png',
'image/jpeg': 'jpg',
'image/gif': 'gif',
};
var mimeType = bookData.image_mime_type;
if (mimeType && map[mimeType]) {
ext = map[mimeType]
}
return ext;
}
};
ui.appendStartBtn();
if (!loader.checkVersion()) {
ui.updateBtnText('暂不支持此作品, 点击尝试运行');
}
ui.btnClick(function (btn) {
btn.disabled = true;
if (!loader.checkValidity()) {
alert('脚本已失效');
return;
}
taskRun();
});
// 顺序处理
function taskRun(pageNow) {
if (!pageNow) {
pageNow = 1;
}
var pageMax = loader.getMaxPage();
var fileNo = pageNow.toString().padStart(pageMax.toString().length, '0');
var fileName = loader.getBookName() + '_' + fileNo;
if (pageNow > pageMax) {
ui.updateBtnText('下载完毕');
return;
}
ui.updateBtnText('下载中: ' + pageNow + '/' + pageMax);
loader.loadPage(pageNow, function (img, imgKey) {
downloader.downloadImg(img, imgKey, fileName);
pageNow++;
// 防止请求过快延迟1秒
setTimeout(function () {
taskRun(pageNow);
}, 1000);
});
}
})();
