// ==UserScript==
// @name              网易云课堂下载助手（需配合Aria2使用）
// @name:en           Study163 Downloader
// @namespace         http://mofiter.com/
// @version           0.7
// @description       在网易云课堂的课程目录页面添加下载助手按钮（可批量下载和单个视频下载），方便将视频下载到本地学习
// @description:en    add download button on study.163.com to download videos
// @author            mofiter
// @require           https://cdn.bootcss.com/jquery/1.12.4/jquery.min.js
// @match             *://study.163.com/course/courseMain.htm?courseId=*
// @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 video_file_name; //视频文件名称
var aria2_url = "http://127.0.0.1:6800/jsonrpc"; //Aria2 地址
var course_save_path = '/Users/mofiter/Downloads/study163'; //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': [],'course_price': {},'course_duration': {}}; //课程信息
var cookies = document.cookie;
var match_cookie = 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++ + "-Study163Downloader-log:",param1,param2);
}
setTimeout(function(){
if(!getCourseInfo()){
return;
}
loadSetting();
addDownloadAssistant();
addDownloadButton();
mylog("网易云课堂下载助手加载完成~");
},5000); //页面加载完成后延时5秒执行
//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','');
}
//添加下载助手按钮
function addDownloadAssistant(){
$(".u-navsearchUI").css("width","224px");
var download_assistant_div = $("<div class='m-nav_item' style='margin-left:24px;'></div>");
var download_assistant = $("<span>下载助手</span>");
var assistant_div = $("<div class='f-pa' style='line-height:40px;display:none;left:0px;top:60px;width:auto;height:auto;background-color:#fff;color:#666;border:1px solid #ddd;padding:0 10px;text-align:center;'><div class='arrr f-pa' style='background:url(//s.stu.126.net/res/images/ui/ui_new_yktnav_sprite.png) 9999px 9999px no-repeat;top:-9px;left:40px;width:14px;height:9px;background-position:-187px 0;'></div></div>");
var batch_download = $("<a style='width:50%;float:left;'>批量下载</a>");
var assistant_setting = $("<a style='width:50%;float:right;'>设置</a>");
var recommendation = $("<img width='300px' src='https://qcloud.coding.net/u/mofiter/p/public_files/git/raw/master/recommendation.png'>");
assistant_div.append(batch_download).append(assistant_setting).append(recommendation);
download_assistant_div.append(download_assistant).append(assistant_div);
$('.m-nav').append(download_assistant_div);
download_assistant_div.mouseover(function(){
assistant_div.show();
});
download_assistant_div.mouseout(function(){
assistant_div.hide();
});
batch_download.click(function(){
assistant_div.hide();
loadSetting();
if(course_save_path==""){
alert("请到下载助手的设置里面填写文件保存位置");
}else if(aria2_url==""){
alert("请到下载助手的设置里面填写 Aria2 地址");
}else{
batchDownload();
}
});
assistant_setting.click(function(){
assistant_div.hide();
showSetting();
});
}
//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;top:30%;left:45%;width:auto;height:auto;background-color:#eee;padding:5px 10px;font-size:14px;border:1px solid;";
container.innerHTML =
"<div style='line-height:25px;'>" +
"<legend style='text-align:center;'>下载助手设置</legend>" +
"<ul>" +
"<li>Aria2 地址：</li>" +
"<li><input type='text' id='aria2_url' name='aria2_url' value='" + aria2_url + "' style='width:100%'></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%'></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;'></input>\n" +
"<input type='button' value='保存' id='save_button' style='position:relative;float:right;border:1px solid #ccc;padding:0 2px;'></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 getCourseInfo(){
var courseVo = unsafeWindow.courseVo;
mylog(courseVo);
course_info.course_id = courseVo.id; //课程 id
course_info.course_name = courseVo.name.replace(/:|\?|\*|"|<|>|\|/g," "); //课程名称
course_info.course_price = courseVo.price; //课程价格
var chapter = courseVo.chapterDtos; //课程章节
var allSeconds = 0; //课程总时长，单位为秒
chapter.forEach(function(val,index){
var chapter = {'chapter_id': val.id,'chapter_name': val.name.replace(/:|\?|\*|"|<|>|\|/g," "),'lesson_info': []}; //章节信息
var lessonDtos = val.lessonDtos;
lessonDtos.forEach(function(val,index){
var lesson = {'keshi':val.ksstr,'lesson_id':val.id,'lesson_name':val.lessonName.replace(/:|\?|\*|"|<|>|\|/g," "),'lesson_type':val.lessonType}; //课时信息
if(val.videoTime){
var videoTime = val.videoTime.split(':');
if(videoTime.length == 3){
allSeconds += parseInt(videoTime[0]) * 3600 + parseInt(videoTime[1]) * 60 + parseInt(videoTime[2]);
}else if(videoTime.length == 2){
allSeconds += parseInt(videoTime[0]) * 60 + parseInt(videoTime[1]);
}else if(videoTime.length == 1){
allSeconds += parseInt(videoTime[0]);
}
}
chapter.lesson_info.push(lesson);
});
course_info.chapter_info.push(chapter);
});
var formatTime = {'hour':0,'minute':0,'second':0};
formatTime.hour = parseInt(allSeconds/3600);
formatTime.minute = parseInt(allSeconds%3600/60);
formatTime.second = parseInt(allSeconds%3600%60);
if(formatTime.hour){
course_info.course_duration = formatTime.hour + "小时" + formatTime.minute + "分" + formatTime.second + "秒";
}else if(formatTime.minute){
course_info.course_duration = formatTime.minute + "分" + formatTime.second + "秒";
}else if(formatTime.second){
course_info.course_duration = formatTime.second + "秒";
}
mylog(course_info);
if(course_info.course_price > 0){
return false;
}else{
return true;
}
}
//批量下载
function batchDownload(){
course_info.chapter_info.forEach(function(chapter,index){
chapter.lesson_info.forEach(function(lesson){
var file_name = lesson.keshi + '_' + lesson.lesson_name;
var save_path = course_save_path.replace(/\\/g,'\/') + '/' + course_info.course_name + '/章节' + (index + 1) + '_' + chapter.chapter_name;
if(lesson.lesson_type=="3"){
getTextLearnInfo(lesson,file_name,save_path);
}else{
getVideoLearnInfo(lesson,file_name,save_path);
}
});
});
}
// 添加下载按钮
function addDownloadButton(){
var ksbtn = document.getElementsByClassName('ksbtn')[0];
var ksbtn_style = 'display:' + getStyle(ksbtn,'display') + ';width:' + getStyle(ksbtn,'width') + ';background-position:' + getStyle(ksbtn,'background-position') + ';margin-top:' + getStyle(ksbtn,'margin-top') + ';';
var ksbtn_span = ksbtn.firstChild;
var ksbtn_span_style = 'display:' + getStyle(ksbtn_span,'display') + ';text-align:' + getStyle(ksbtn_span,'text-align') + ';background:' + getStyle(ksbtn_span,'background') +
';width:' + getStyle(ksbtn_span,'width') + ';font-size:' + getStyle(ksbtn_span,'font-size') + ';height:' + getStyle(ksbtn_span,'height') + ';line-height:' +
getStyle(ksbtn_span,'line-height') + ';color:' + getStyle(ksbtn_span,'color') + ';background-position:' + getStyle(ksbtn_span,'background-position') + ';';
var allNodes = document.getElementsByClassName("section");
for (var i = 0;i < allNodes.length;i ++) {
var download_button = document.createElement("a");
var style = 'display:block;text-align:center;padding-left:10px;width:58px;font-size:12px;height:34px;line-height:33px;color:#fff;background-position:-40px 0px;';
download_button.innerHTML = "<span>下载</span>";
download_button.className = "f-fr j-hovershow download-button";
download_button.style = ksbtn_style;
download_button.lastChild.style = ksbtn_span_style;
allNodes[i].appendChild(download_button);
}
$('.download-button').each(function(){ //下载按钮点击事件
$(this).click(function(event){
loadSetting();
if(course_save_path==""){
alert("请到下载助手的设置里面填写文件保存位置");
}else if(aria2_url==""){
alert("请到下载助手的设置里面填写 Aria2 地址");
}else{
var data_chapter = event.target.parentNode.parentNode.getAttribute("data-chapter");
var data_lesson = event.target.parentNode.parentNode.getAttribute("data-lesson");
var index = Number(data_lesson);
for(var i = 0;i < Number(data_chapter); i ++){
index = index - course_info.chapter_info[i].lesson_info.length;
}
var lesson = course_info.chapter_info[data_chapter].lesson_info[index];
mylog("选择的课为【lesson_name: " + lesson.lesson_name + ",lesson_id: " + lesson.lesson_id + ",lesson_type: " + lesson.lesson_type + '】');
var file_name = lesson.keshi + '_' + lesson.lesson_name;
var save_path = course_save_path.replace(/\\/g,'\/') + '/' + course_info.course_name + '/章节' + (Number(data_chapter) + 1) + '_' + course_info.chapter_info[data_chapter].chapter_name;
if(lesson.lesson_type=="3"){
getTextLearnInfo(lesson,file_name,save_path);
}else{
getVideoLearnInfo(lesson,file_name,save_path);
}
}
event.stopPropagation();
});
});
}
//获取文档下载地址
function getTextLearnInfo(lesson,file_name,save_path){
var timestamp = new Date().getTime();
var params = {
"callCount":"1",
"scriptSessionId":"${scriptSessionId}190",
"httpSessionId":match_cookie,
"c0-scriptName":"LessonLearnBean",
"c0-methodName":"getTextLearnInfo",
"c0-id":"0",
"c0-param0":"string:" + lesson.lesson_id,
"c0-param1":"string:" + course_info.course_id,
"batchId":timestamp
};
var url = "https://study.163.com/dwr/call/plaincall/LessonLearnBean.getTextLearnInfo.dwr?" + timestamp;
$.ajax({
url:url,
method:'POST',
async: true,
data: params,
success: function (response){
var pdfUrl = response.match(/pdfUrl:"(.*?)"/)[1];
sendDownloadTaskToAria2(pdfUrl,file_name + ".pdf",save_path);
}
});
}
//获取视频文件信息
function getVideoLearnInfo(lesson,file_name,save_path){
var timestamp = new Date().getTime();
var params = {
"callCount":"1",
"scriptSessionId":"${scriptSessionId}190",
"httpSessionId":match_cookie,
"c0-scriptName":"LessonLearnBean",
"c0-methodName":"getVideoLearnInfo",
"c0-id":"0",
"c0-param0":"string:" + lesson.lesson_id,
"c0-param1":"string:" + course_info.course_id,
"batchId":timestamp
};
var url = "https://study.163.com/dwr/call/plaincall/LessonLearnBean.getVideoLearnInfo.dwr?" + timestamp;
$.ajax({
url:url,
method:'POST',
async: true,
data: params,
success: function (response){
var signature = response.match(/signature="(\w+?)";/)[1];
var videoId = response.match(/videoId=(\w+?);/)[1];
getVideoUrl(videoId,signature,file_name,save_path);
}
});
}
//获取视频下载地址
function getVideoUrl(videoId,signature,file_name,save_path){
var params = {
'videoId':videoId,
'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;
}
}
});
}
//获取元素样式
function getStyle(element,cssPropertyName){
if(window.getComputedStyle){ //如果支持getComputedStyle属性（IE9及以上，ie9以下不兼容）
return window.getComputedStyle(element)[cssPropertyName];
} else { //如果支持currentStyle（IE9以下使用），返回
return element.currentStyle[cssPropertyName];
}
}
})();