// ==UserScript==
// @name 文泉学堂下载
// @namespace
// @version 0.54.6
// @author
// @grant none
// @description 基于Culaccino的文泉学堂PDF下载0.53版本，适应了新的页面。仅在chrome中测试成功。使用方法：打开电子书页面后，在页面中任意点击一次，然后点击左上角页码框，即开始下载。
// @match https://*.wqxuetang.com/read/pdf?*
// @require https://cdn.staticfile.org/jspdf/1.5.3/jspdf.min.js
// @run-at document-start
// ==/UserScript==
(function () {
const downloadNum = 30 //每次达到此页数就自动保存，可根据实际情况改动
var imgBox, nowPage,startPage, allPage, doc, size, name, startNum = 1,isStart = false, isReady = false, pageList, dataIndex, beginTime = new Date(),dataList = {}
const baseURL = `https://${window.location.host}/`
const bid = window.location.href.replace(baseURL + "read/pdf?bid=", "")
Array.prototype.remove = function (val) {
const index = this.indexOf(val);
if (index > -1) this.splice(index, 1)
}
function print() {
console.log(...arguments)
}
function sleep(min, max) {
min *= 1000;
max *= 1000;
const time = !min ? max : Math.floor(Math.random() * (max - min + 1)) + min;
print('等待时间：', time)
return new Promise((resolve) => setTimeout(resolve, time));
}
function createList(now) {
let arr = []
for (let i = now || nowPage; i < Math.min((now || nowPage) + downloadNum, allPage + 1); i++) arr.push(i)
startNum = arr[0]
return arr
}
function savePDF(num) {
doc.save(`${name}_${num !== allPage ? num - downloadNum + 1 : num - (num - startPage)%downloadNum}-${num}.pdf`)
if (num !== allPage) doc = new jspdf.jsPDF(size[0] < size[1] ? "" : "l", 'pt', size)
print("总耗时 " + parseInt((new Date() - beginTime) / 1000 / 60) + " 分钟")
}
function getName() {
name = document.getElementsByClassName("page-head-s")[0].innerHTML
}
function getCanvasContext(canvas) {
return canvas.__proto__.getContext.call(canvas,"2d");
}
function loadScript(src) {
let spt = document.createElement('script')
spt.src = src
spt.type = 'text/javascript'
let header = document.getElementsByTagName('header')[0]
header.appendChild(spt)
}
function antiAntiDebug() {
if((function(){}).constructor === Function) {
Function.prototype.constructor = function(){}
}
}
async function autoScroll(num, isCorrect = true) {
if (pageList[num - 1] === pageList[pageList.length - 1]) num = 0
print('从第' + pageList[num] + '页开始, 索引号：' + num + ', 共' + pageList.length + '页')
for(let p = 0; p < pageList.length; p++) {
let pageNo = pageList[p]
//document.documentElement.scrollTop = imgBox[pageList[num]].offsetTop
imgBox[pageNo].scrollIntoView()
let bandImgs = imgBox[pageNo].childNodes[1]
let waitTimes = 3;
while (bandImgs.children.length <= 0 && waitTimes-- > 0) {
await sleep(8, 10)
}
if(size == undefined) {
size = [0, 0]
for( i = 0; i < bandImgs.children.length; i++) {
var img = bandImgs.childNodes[i]
while(!img.complete) {
await sleep(0.5,1)
}
let w = img.naturalWidth, h=img.naturalHeight
size = [size[0] + w, h]
}
var canvas = document.createElement("canvas");
canvas.width = size[0]
canvas.height = size[1]
print('页面：', size[0], 'X', size[1])
}
if (doc == undefined) {
doc = new jspdf.jsPDF(size[0] < size[1] ? "" : "l", 'pt', [size[0], size[1]])
}
var startX = 0
for(var i = 0; i < bandImgs.children.length; i++) {
img = bandImgs.childNodes[i]
while(!img.complete) {
await sleep(0.5,1)
}
let w = img.naturalWidth, h=img.naturalHeight
//print('图像：', w, h)
getCanvasContext(canvas).drawImage(img, startX, 0, w, h);
startX += w
}
//var image = canvas.toDataURL("image/png");
//canvas.toDataURL("image/png").replace("image/png", "image/octet-stream");
//window.location.href=image;
//var w=window.open('about:blank','image from canvas')
//w.document.write("<img src='"+image+"' alt='from canvas'/>");
doc.addImage(canvas, 'JPEG', 0, 0, size[0], size[1], undefined, 'SLOW')
getCanvasContext(canvas).clearRect(0, 0, size[0], size[1]);
print('pageNo：', pageNo, ', p', p, '/', pageList.length -1)
if ((p + 1) % downloadNum === 0) {
savePDF(pageNo)
pageList = createList(pageNo + 1)
p = -1
} else if (p == allPage || p == pageList.length - 1) {
isStart = !isStart
savePDF(pageList[0])
return
} else {
doc.addPage()
}
}
}
function main() {
if(!isReady) {
print("正在启动插件...")
loadScript('https://cdn.staticfile.org/jspdf/2.5.1/jspdf.umd.js')
document.getElementsByClassName("page-head-nav")[0].onclick = function () {
if (!isStart) {
print("开始下载......")
const numBox = document.getElementsByClassName("page-head-tol")[0].innerHTML
getName()
imgBox = document.getElementsByClassName("page-img-box")
startPage = nowPage = parseInt(numBox.slice(0, numBox.indexOf("/") - 1))
allPage = imgBox.length - 1
isStart = !isStart
pageList = dataIndex = createList()
autoScroll(0)
} else return
}
window.onbeforeunload = function () {if (isStart) return "leave？"}
window.removeEventListener('click', main)
print("启动插件成功，请点击左上角页码框开始下载。")
}
}
if (window.addEventListener) {
window.addEventListener('DOMContentLoaded', main, false);
window.addEventListener('load', main, false);
window.addEventListener('click', main, false);
} else if (window.attachEvent) {
window.attachEvent('onload', main); //IE
}
antiAntiDebug();
//setTimeout(main, 3000)
})();
