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文泉学堂PDF下载，已支持报错重新下载当前图片
当前为
// ==UserScript==
// @name 文泉学堂PDF下载
// @namespace https://52pojie.cn
// @version 0.21
// @description 文泉学堂PDF下载，已支持报错重新下载当前图片
// @author Culaccino
// @match https://*.wqxuetang.com/read/pdf/*
// @grant none
// @require https://cdn.staticfile.org/crypto-js/3.1.2/rollups/hmac-sha256.js
// @require https://cdn.staticfile.org/crypto-js/3.1.2/components/enc-base64-min.js
// @require https://cdn.staticfile.org/jspdf/1.5.3/jspdf.min.js
// @require https://cdn.staticfile.org/blueimp-md5/2.12.0/js/md5.min.js
// ==/UserScript==
(function() {
const baseURL = `https://${window.location.host}/`
const bid = window.location.href.replace(baseURL + "read/pdf/","")
const headers = {
"credentials": "include",
"headers": {
"User-Agent": navigator.userAgent,
"Accept": "*/*",
"Accept-Language": "zh-CN,zh;q=0.8,zh-TW;q=0.7,zh-HK;q=0.5,en-US;q=0.3,en;q=0.2",
"Cache-Control": "max-age=0"
},
"referrer": window.location.href,
"method": "GET",
"mode": "cors"
}
var doc,size,allPage,name,errorTime = 0,nowPage = 1,btn = document.createElement("button");
const w = 100,
h = 40
btn.innerHTML = "初始化..."
btn.setAttribute("style",`position: fixed; cursor:pointer;z-index: 10000; top: 0px; left: 50%; margin-left: -146.5px;min-width: ${w}px;height: ${h}px;border: none;background: #004DA9;color: #fff;font-size: 16px;border-radius: 0 0 10px 10px;`)
btn.style.marginLeft = -w / 2 + "px"
document.body.appendChild(btn)
function print(){console.log(...arguments)}
function error(){console.error(...arguments)}
var Download = function(){
return new Download.INIT()
}
Download.INIT = function(){
const data = fetch(baseURL + "v1/read/initread?bid=" + bid, headers).then(function(res){
if(res.status >=200 && res.status <300){
return res.json();
}else{
var error = new Error(res.statusText)
error.res = res
throw error
}})
data.then(v=>{d.init(v)})
}
var d = Download.INIT.prototype;
d.init = function(val){
this.val = val["data"];
this.baseURL = baseURL;
this.bid = bid;
this.jwtSecret = "g0NnWdSE8qEjdMD8a1aq12qEYphwErKctvfd3IktWHWiOBpVsgkecur38aBRPn2w";
name = this.val["name"];
const data = fetch(`${this.baseURL}v1/read/k?bid=${this.bid}`, headers).then(function(res){
if(res.status >=200 && res.status <300){
return res.json();
}else{
var error = new Error(res.statusText)
error.res = res
throw error
}})
data.then(v=>{d.getData(v, nowPage)})
}
d.getData = async function(a, p){
const time = Date.parse(new Date).toString().slice(0,10),
foreCode = "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9",
payload = {
p: p,
t: parseInt(time + "000"),
b: this.bid,
w: 1e3,
k: a.data,
iat: parseInt(time)
}
const result = d.jsonWebToken(foreCode,payload,this.jwtSecret);
try{d.convertImgToBase64(result, "jpeg",p, a)}
catch(e){
error("连接出错，开始重新获取", e, p);
await d.sleep(d.randInt(1000,2000));
d.getData(a, p)
}
}
d.jsonWebToken = function(f,p,s){
const b64 = f + "." +btoa(d.objToString(p)).replace(/[=]/g,"");
var hash = CryptoJS.HmacSHA256(b64, s);
var hashInBase64 = CryptoJS.enc.Base64.stringify(hash);
hashInBase64 = hashInBase64.replace(/[+]/g, "-").replace(/[/]/g, "_").replace(/[=]/g, "")
return `${this.baseURL}page/img/${this.bid}/${nowPage}?k=${b64}.${hashInBase64}`
}
d.objToString = function(obj,onoff){
let str = "{";
const sym = v => {let a = onoff ? '\\"' : '"';return a + v + a}
for(let i in obj){
const item = obj[i]
if(typeof item === "object"){
str += sym(i) + ':"' + d.objToString(item,1) + '"'
}else if(typeof item === "number"){
str += sym(i) + ":" + item
}else if(typeof item === "string"){
str += sym(i) + ":" + sym(item)
}
str += ","
}
return str.slice(0,str.length - 1) + "}"
}
d.sleep = function sleep (time) {
print(time)
return new Promise((resolve) => setTimeout(resolve, time));
}
d.randInt = function(min, max){
return Math.floor(Math.random() * (max - min + 1) ) + min;
}
//https://lib-nuanxin.wqxuetang.com/read/pdf/2175744
d.convertImgToBase64 = async function (url, ext, p, a) {
let canvas = document.createElement('canvas'),
ctx = canvas.getContext('2d'),
img = new Image,
data = ""
img.crossOrigin = '';
img.onload = async function () {
canvas.height = img.height;
canvas.width = img.width;
ctx.drawImage(img, 0, 0);
if(!size){size = [img.width,img.height];doc = new jsPDF("", 'pt', size)}
var dataURI = canvas.toDataURL('image/' + ext);
if(dataURI.length === 22471 && md5(dataURI) === "d9fff72044ac9a2726972b9dba58aa4e"){
print("获取到加载中的图片，开始重新获取");
errorTime += 1;
if(errorTime === 5){doc.save(name + '.pdf');throw new Error('获取失败，稍等一会再试试吧');}
await d.sleep(d.randInt(15000,30000))
Download()
return;
}
print("开始下载第" + p + "页")
errorTime = 0;
canvas = null;
btn.innerHTML = `${p}/${allPage}`
doc.addImage(dataURI, 'JPEG', 0, 0, img.width, img.height)
if(p === allPage){doc.save(name + '.pdf');btn.innerHTML = "已完成";return}
doc.addPage()
await d.sleep(d.randInt(1000,2000)) //随机间隔时间
d.getData(a, nowPage = p += 1)
};
img.onerror = async function(){
error("连接出错，开始重新获取", p);
await d.sleep(d.randInt(15000,30000));
d.getData(a, p)
}
img.src = url;
}
window.Download = Download;
window.onload = function(){
btn.innerHTML = "下载PDF"
btn.onclick = function(){
try{
let a = document.getElementsByClassName("page-head-tol")[0].innerHTML
allPage = parseInt(a.slice(a.indexOf("/") + 1,a.length))
this.innerHTML = "加载中...";
Download()
}catch(e){alert("无法获取页面，请等待页面出现图片之后再下载")}
}
}
})();