try to take over the world!
当前为
// ==UserScript==
// @name 云端课堂回放下载
// @license MIT
// @namespace http://tampermonkey.net/
// @version 0.2
// @description try to take over the world!
// @author You
// @match https://e62580258.at.baijiayun.com/web/playback/index?*
// @icon https://www.google.com/s2/favicons?sz=64&domain=baijiayun.com
// @grant none
// @require https://ajax.aspnetcdn.com/ajax/jQuery/jquery-3.5.1.min.js
// ==/UserScript==
var i = function (e, t) {
var r = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
var n = r.indexOf(e.charAt(t));
if (-1 === n) throw "Cannot decode base64";
return n
};
// 解密视频地址
var decryptVideo = function(e) {
if ("" === e || 0 !== e.indexOf("bjcloudvod://"))
return "";
var t = (e = e.slice("bjcloudvod://".length, e.length).replace(/-/g, "+").replace(/_/g, "/")).length % 4;
2 === t ? e += "==" : 3 === t && (e += "=");
var n = (e = bb(e)).charCodeAt(0) % 8;
e = e.slice(1, e.length);
for (var i, a = [], s = 0; i = e[s]; s++) {
var o = s % 4 * n + s % 3 + 1;
a.push(String.fromCharCode(i.charCodeAt(0) - o))
}
return a.join("").replace("https:", "").replace("http:", "")
};
// 解密编码
var bb = function (e) {
var t, n, r = 0,
a = e.length,
s = [];
if (e = String(e), 0 === a) return e;
if (a % 4 != 0) throw "Cannot decode base64";
for ("=" === e.charAt(a - 1) && (r = 1, "=" === e.charAt(a - 2) && (r = 2), a -= 4), t = 0; t <
a; t += 4) n = i(e, t) << 18 | i(e, t + 1) << 12 | i(e, t + 2) << 6 | i(e, t + 3), s.push(
String.fromCharCode(n >> 16, n >> 8 & 255, 255 & n));
switch (r) {
case 1:
n = i(e, t) << 18 | i(e, t + 1) << 12 | i(e, t + 2) << 6, s.push(String.fromCharCode(
n >> 16, n >> 8 & 255));
break;
case 2:
n = i(e, t) << 18 | i(e, t + 1) << 12, s.push(String.fromCharCode(n >> 16))
}
return s.join("")
};
// 下载服务器的MP4文件
function downloadMp4(filePath,fileName){
fetch(filePath).then(res => res.blob()).then(blob => {
const a = document.createElement('a');
//document.body.appendChild(a)
a.style.display = 'none'
// 使用获取到的blob对象创建的url
const url = window.URL.createObjectURL(blob);
a.href = url;
// 指定下载的文件名
a.download = fileName;
a.click();
document.body.removeChild(a)
// 移除blob对象的url
window.URL.revokeObjectURL(url);
});
}
(function() {
console.log("云端课堂脚本下载开始");
// 视频信息
var videoInfo = null;
/**
* 云端课堂回放视频下载
*/
function baijiayunVideoXhrHandler(e){
// 不符合url || 响应数据如果不为空
var flag = e.srcElement.responseURL.indexOf("/web/playback/getPlayInfo")==-1 || videoInfo!=null;
if(flag){
return false;
}
console.log(e);
// 响应数据
var responseBody = e.currentTarget.response;
responseBody = responseBody.substring(responseBody.indexOf("(")+1,responseBody.lastIndexOf(")"));
// 处理为json结构
responseBody = JSON.parse(responseBody);
videoInfo = responseBody
console.log(responseBody);
// 默认获取画质最高的
var videoUrl = responseBody.data.play_info['superHD'] || responseBody.data.play_info['high'] || responseBody.data.play_info['720p'];
videoUrl = videoUrl.cdn_list[0].enc_url;
console.log(videoUrl);
videoUrl = "http:" + decryptVideo(videoUrl);
console.log('视频地址解析后：'+videoUrl);
// 视频名称
var fileName = `${responseBody.data.video_info.title}.${responseBody.data.format}`;
downloadMp4(videoUrl,fileName);
// 触发下载后返回上一页
history.back();
}
(function() {
const originalOpen = XMLHttpRequest.prototype.open;
console.log("添加xhr拦截器");
XMLHttpRequest.prototype.open = function() {
this.addEventListener('readystatechange', (e) => {
baijiayunVideoXhrHandler(e);
});
originalOpen.apply(this, arguments);
};
})();
})();