add download button on icourse163.org to download videos
// ==UserScript==
// @name 中国大学 MOOC 下载助手（需配合Aria2使用）
// @name:en Icourse163 Downloader
// @namespace http://mofiter.com/
// @version 0.3
// @description 在中国大学 MOOC 的课程学习页面添加批量下载按钮，方便将视频下载到本地学习
// @description:en add download button on icourse163.org to download videos
// @author mofiter
// @require https://cdn.bootcss.com/jquery/1.12.4/jquery.min.js
// @match *://www.icourse163.org/learn/*
// @grant unsafeWindow
// @grant GM_getValue
// @grant GM_setValue
// @grant GM_xmlhttpRequest
// @grant GM_openInTab
// ==/UserScript==
(function() {
'use strict';
var $ = $ || window.$;
var log_count = 1;
var hasOpenAriac2Tab = false;
var video_quality = 2; //视频清晰度
var video_format = 'mp4'; //视频格式
var aria2_url = "http://127.0.0.1:6800/jsonrpc"; //Aria2 地址
var course_save_path = '/Users/mofiter/Downloads/icourse163'; //课程保存路径
var video_save_path; //每个视频保存路径
var video_download_url = ""; //视频下载地址
var course_info = {'course_id': {},'course_name': {},'chapter_info': []}; //课程信息
var cookies = document.cookie;
var sessionId = cookies.match(/NTESSTUDYSI=(\w+)/)[1];
//自定义 log 函数
function mylog(param1,param2){
param1 = param1 ? param1 : "";
param2 = param2 ? param2 : "";
console.log("#" + log_count++ + "-Icourse163Downloader-log:",param1,param2);
}
setTimeout(function(){
getCourseIdAndName();
getCourseContentInfo();
loadSetting();
addDownloadAssistant();
mylog("中国大学 MOOC 下载助手加载完成~");
},2000); //页面加载完成后延时2秒执行
//获取课程名称
function getCourseIdAndName(){
var courseCardDto = unsafeWindow.courseCardDto;
course_info.course_name = courseCardDto.name.replace(/\/|:|\?|\*|"|<|>|\|/g," ");
if(location.href.match(/tid=(\d+)/)[1]){
course_info.course_id = location.href.match(/tid=(\d+)/)[1];
}else{
course_info.course_id = courseCardDto.currentTermId;
}
}
//添加批量下载和下载设置按钮
function addDownloadAssistant(){
var batch_download_li = $("<li class='u-greentab'></li>");
var batch_download = $("<a>批量下载</a>");
batch_download_li.append(batch_download);
var assistant_setting_li = $("<li class='u-greentab'></li>");
var assistant_setting = $("<a>下载设置</a>");
assistant_setting_li.append(assistant_setting);
$('#j-courseTabList').append(batch_download_li).append(assistant_setting_li);
batch_download_li.click(function(){
loadSetting();
if(course_save_path==""){
alert("请点击下载设置去填写文件保存位置");
}else if(aria2_url==""){
alert("请点击下载设置去填写 Aria2 地址");
}else{
batchDownload();
}
});
assistant_setting_li.click(function(){
showSetting();
});
}
//加载个人设置
function loadSetting(){
video_quality = GM_getValue('video_quality', 2);
video_format = GM_getValue('video_format','mp4');
aria2_url = GM_getValue('aria2_url','http://127.0.0.1:6800/jsonrpc');
course_save_path = GM_getValue('course_save_path','');
}
//打开设置
function showSetting(){
if(document.querySelector('#dl-setting') == null){
var container = document.createElement("div");
container.id = "dl-setting";
container.style = "position:fixed;z-index:999999;bottom:10%;right:40px;width:220px;height:auto;background-color:#f8f8f8;padding:5px 10px;font-size:14px;border:1px solid #ccc;";
container.innerHTML =
"<div style='line-height:25px;'>" +
"<legend style='text-align:center;font-size:16px;'>下载设置</legend>" +
"<ul>" +
"<li>Aria2 地址：</li>" +
"<li><input type='text' id='aria2_url' name='aria2_url' value='" + aria2_url + "' style='width:100%;background:#ffffff;'></input></li>" +
"<li>文件保存位置：</li>\n" +
"<li><input type='text' id='save_path' name='save_path' value='" + course_save_path + "' style='width:100%;background:#ffffff;'></input></li>" +
"<li>清晰度：<label title='高清'><input id='video-quality-2' name='video-quality' value='2' type='radio' style='margin:0 5px;'" + (video_quality==2 ? "checked":"") + "></input>高清</label>\n" +
"<label title='标清' style='padding:0 5px;'><input id='video-quality-1' name='video-quality' value='1' type='radio' style='margin:0 5px;'" + (video_quality==1 ? "checked":"") + "></input>标清</label></li>\n" +
"<li>格式：<label title='mp4' style='padding:0 0 0 14px;'><input id='video-format-mp4' name='video-format' value='mp4' type='radio' style='margin:0 5px;'" + (video_format=='mp4' ? "checked":"") + "></input>mp4</label>" +
"<label title='flv' style='padding:0 5px;'><input id='video-format-flv' name='video-format' value='flv' type='radio' style='margin:0 5px 0 10px;'" + (video_format=='flv' ? "checked":"") + "></input>flv</label></li>" +
"</ul>\n" +
"<input type='button' value='取消' id='cancel_button' style='position:relative;float:left;border:1px solid #ccc;padding:0 2px;background:#ffffff;'></input>\n" +
"<input type='button' value='保存' id='save_button' style='position:relative;float:right;border:1px solid #ccc;padding:0 2px;background:#ffffff;'></input>\n" +
"</div>";
document.body.appendChild(container);
}else{
loadSetting();
if(video_quality==2){
$('#video-quality-2').prop('checked',true);
}else{
$('#video-quality-1').prop('checked',true);
}
if(video_format=='mp4'){
$('#video-format-mp4').prop('checked',true);
}else{
$('#video-format-flv').prop('checked',true);
}
$('#aria2_url').value = aria2_url;
$('#save_path').value = course_save_path;
$('#dl-setting').show();
}
$('#save_button').click(function(){
GM_setValue('video_quality',$('input[name="video-quality"]:checked').val());
GM_setValue('video_format',$('input[name="video-format"]:checked').val());
GM_setValue('aria2_url',$('input[name="aria2_url"]').val());
GM_setValue('course_save_path',$('input[name="save_path"]').val());
$('#dl-setting').hide();
});
$('#cancel_button').click(function(){
$('#dl-setting').hide();
});
}
//获取课程信息
function getCourseContentInfo(){
var timestamp = new Date().getTime();
var params = {
"callCount":"1",
"scriptSessionId":"${scriptSessionId}190",
"httpSessionId":sessionId,
"c0-scriptName":"CourseBean",
"c0-methodName":"getLastLearnedMocTermDto",
"c0-id":"0",
"c0-param0":"number:" + course_info.course_id,
"batchId":timestamp
};
$.ajax({
url:'https://www.icourse163.org/dwr/call/plaincall/CourseBean.getLastLearnedMocTermDto.dwr',
method:'POST',
async: true,
data: params,
success: function (response){
var chapter1 = response.match(/chapters=(.*?);/)[1]; //保存全部章节的变量
var reg1 = new RegExp(chapter1 + '\\[\\d+]=(.*?);','g');
var chapter2 = response.match(reg1); //保存各章节的变量
chapter2.forEach(function(value){
var chapter3 = value.match(/=(.*?);/)[1]; //保存各章节的变量名字
var reg2 = new RegExp(chapter3 + '.id=(.*?);' + chapter3 + '.lessons=(.*?);' + chapter3 + '.name="(.*?)";');
var chapter4 = response.match(reg2); //保存章节 id，lessons，name 的变量
var reg3 = new RegExp(chapter4[2] + '\\[\\d+]=(.*?);','g');
var lessons = response.match(reg3); //保存各小节的变量
var chapter = {'chapter_id':chapter4[1],'chapter_name':unescape(chapter4[3].replace(/\\u/gi, '%u').replace(/\/|:|\?|\*|"|<|>|\|/g," ")),'lesson_info':[]};
lessons.forEach(function(value){
var lesson1 = value.match(/=(.*?);/)[1]; //保存各小节的变量名字
var reg4 = new RegExp(lesson1 + '.chapterId=(.*?);.*?' + lesson1 + '.id=(.*?);.*?' + lesson1 + '.name="(.*?)";.*?' + lesson1 + '.units=(.*?);');
var lesson2 = response.match(reg4);
var reg5 = new RegExp(lesson2[4] + '\\[\\d+]=(.*?);','g');
var sections = response.match(reg5);
var lesson = {'chapter_id':lesson2[1],'lesson_id':lesson2[2],'lesson_name':unescape(lesson2[3].replace(/\\u/gi, '%u').replace(/\/|:|\?|\*|"|<|>|\|/g," ")),'section_info':[]};
sections.forEach(function(value){
var section1 = value.match(/=(.*?);/)[1];
var reg6 = new RegExp(section1 + '.chapterId=(.*?);.*?' + section1 + '.contentId=(.*?);.*?' + section1 + '.contentType=(.*?);.*?' + section1 + '.id=(.*?);.*?' + section1 + '.lessonId=(.*?);.*?' + section1 + '.name="(.*?)";.*?');
var section2 = response.match(reg6);
var section = {'chapter_id':section2[1],'lesson_id':section2[5],'content_id':section2[2],'section_id':section2[4],'section_name':unescape(section2[6].replace(/\\u/gi, '%u').replace(/\/|:|\?|\*|"|<|>|\|/g," ")),'content_type':section2[3]};
lesson.section_info.push(section);
});
chapter.lesson_info.push(lesson);
});
course_info.chapter_info.push(chapter);
});
mylog(course_info);
}
});
}
//批量下载
function batchDownload(){
course_info.chapter_info.forEach(function(chapter,index_chapter){
chapter.lesson_info.forEach(function(lesson,index_lesson){
lesson.section_info.forEach(function(section,index_section){
var file_name = '第' + (index_section + 1) + '部分_' + section.section_name;
var save_path = course_save_path.replace(/\\/g,'\/') + '/' + course_info.course_name + '/第' + (index_chapter + 1) + '章_' + chapter.chapter_name + '/第' + (index_lesson + 1) + '节_' + lesson.lesson_name;
if(section.content_type == '1'){
getVideoToken(section.content_id,file_name,save_path);
} else if(section.content_type == '3'){
getCourseContentUrl(section.content_id,section.section_id,file_name,save_path);
}
});
});
});
}
//获取文档下载地址
function getCourseContentUrl(content_id,section_id,file_name,save_path){
var timestamp = new Date().getTime();
var params = {
"callCount":"1",
"scriptSessionId":"${scriptSessionId}190",
"httpSessionId":sessionId,
"c0-scriptName":"CourseBean",
"c0-methodName":"getLessonUnitLearnVo",
"c0-id":"0",
"c0-param0":"number:" + content_id,
"c0-param1":"number:3",
"c0-param2":"number:0",
"c0-param3":"number:" + section_id,
"batchId":timestamp
};
$.ajax({
url:'https://www.icourse163.org/dwr/call/plaincall/CourseBean.getLessonUnitLearnVo.dwr',
method:'POST',
async: true,
data: params,
success: function (response){
var pdfUrl = response.match(/textOrigUrl:"(.*?)",/)[1];
//mylog(pdfUrl);
sendDownloadTaskToAria2(pdfUrl,file_name + ".pdf",save_path);
}
});
}
//获取视频信息
function getVideoToken(content_id,file_name,save_path){
var params = {
'videoId':content_id,
'targetId':course_info.course_id,
'targetType':'0'
};
$.ajax({
url:'https://www.icourse163.org/web/j/resourceRpcBean.getVideoToken.rpc?csrfKey=' + sessionId,
method:'POST',
async: true,
data: params,
success: function (response){
var signature = response.result.signature;
getVideoUrl(content_id,signature,file_name,save_path);
}
});
}
//获取视频下载地址
function getVideoUrl(content_id,signature,file_name,save_path){
var params = {
'videoId':content_id,
'signature':signature,
'clientType':'1'
};
$.ajax({
url:'https://vod.study.163.com/eds/api/v1/vod/video',
method:'POST',
async: true,
data: params,
success: function (response){
var videoUrls = response.result.videos;
var video_url_list = [];
videoUrls.forEach(function(video){
if(video.format == video_format) {
video_url_list.push({'video_format': video.format,'video_quality': video.quality,'video_url': video.videoUrl});
}
});
if(video_url_list.length != 0){
if(video_quality=="2"){
video_download_url = video_url_list[video_url_list.length-1].video_url;
}else{
video_download_url = video_url_list[0].video_url;
}
}
if(video_download_url != ""){
//mylog(video_download_url);
sendDownloadTaskToAria2(video_download_url,file_name + '.' + video_format,save_path);
}
}
});
}
// 将下载链接发送到 Aria2 下载
function sendDownloadTaskToAria2(download_url,file_name,save_path){
var json_rpc = {
id:'',
jsonrpc:'2.0',
method:'aria2.addUri',
params:[
[download_url],
{
dir:save_path,
out:file_name
}
]
};
GM_xmlhttpRequest({
url:aria2_url,
method:'POST',
data:JSON.stringify(json_rpc),
onerror:function(response){
mylog(response);
},
onload:function(response){
mylog(response);
if (!hasOpenAriac2Tab){
GM_openInTab('http://aria2c.com/',{active:true});
hasOpenAriac2Tab = true;
}
}
});
}
})();