// ==UserScript==
// @name         超星学习通课程资源直链下载
// @namespace    https://github.com/ColdThunder11/ChaoXingDownload
// @version      0.20
// @description  超星学习通课程资源直链下载，支持ppt(x),doc(x),pdf,mp4,flv,mp3,avi资源的下载，支持整节课资源批量下载。
// @author       ColdThunder11
// @match        http*://*.chaoxing.com/mycourse/studentstudy?chapterId=*&courseId=*&clazzid=*&enc=*
// @match        http*://*.edu.cn/mycourse/studentstudy?chapterId=*&courseId=*&clazzid=*&enc=*
// @grant        none
// @supportURL   https://github.com/ColdThunder11/ChaoXingDownload/issues
// @downloadURL none
// ==/UserScript==

(function() {
    'use strict';
    setInterval(()=>{
        var haveResource=false;
        var downloadLinks;
        var iframes=document.getElementsByTagName("iframe");
        for(var i=0;i<iframes.length;i++){
            var frames=iframes[i].contentWindow.document.getElementsByTagName("iframe");
            for(var j=0;j<frames.length;j++){
                var frame=frames[j];
                if(!frame) return;
                var fdiv=frame.parentNode;
                if(!fdiv) return;
                if(iframes[i].contentWindow.document.getElementsByClassName("ct11_dl")[j]!=null) return;
                var data=frame.getAttribute('data');
                if(data!=null){
                    var jsondata=JSON.parse(data);
                    if(jsondata.type==".ppt"||jsondata.type==".pptx"||jsondata.type==".mp4"||jsondata.type==".pdf"||jsondata.type==".flv"||jsondata.type==".doc"||jsondata.type==".docx"||jsondata.type==".avi"){
                        if(!haveResource) {
                            haveResource=true;
                            downloadLinks=new Array();
                        }
                        downloadLinks.push("https://d0.ananas.chaoxing.com/download/"+jsondata.objectid)
                        var downloadTag = document.createElement("A");
                        downloadTag.setAttribute("href","https://d0.ananas.chaoxing.com/download/"+jsondata.objectid);
                        downloadTag.setAttribute("class","ct11_dl");
                        downloadTag.setAttribute("style","font-size: 14px;color: #666666;");
                        downloadTag.innerHTML="点此下载 "+jsondata.name;
                        fdiv.appendChild(downloadTag);
                        continue;
                    }
                }
                if(frame.getAttribute("name")==null) continue;
                if(frame.getAttribute("name").substr(frame.getAttribute("name").length-4,4)==".mp3"){
                    if(!haveResource) {
                        haveResource=true;
                        downloadLinks=new Array();
                    }
                    downloadLinks.push("https://d0.ananas.chaoxing.com/download/"+frame.getAttribute("objectid"))
                    var adownloadTag = document.createElement("A");
                    adownloadTag.setAttribute("href","https://d0.ananas.chaoxing.com/download/"+frame.getAttribute("objectid"));
                    adownloadTag.setAttribute("class","ct11_dl");
                    adownloadTag.setAttribute("style","font-size: 14px;color: #666666;");
                    adownloadTag.innerHTML="点此下载 "+frame.getAttribute("name");
                    fdiv.appendChild(adownloadTag);
                    continue;
                }

            }
        }
        if(haveResource){
            if(iframes[0].parentNode.getElementsByClassName("ct11_dl")[0]!=null) iframes[0].parentNode.getElementsByClassName("ct11_dl")[0].remove
            var allDownloadTag = document.createElement("A");
            allDownloadTag.setAttribute("class","ct11_dl");
            allDownloadTag.setAttribute("style","font-size: 14px;color: #666666;");
            allDownloadTag.setAttribute("href","javascript:void(0)");
            allDownloadTag.innerHTML="点此下载本节内的全部资源";
            allDownloadTag.onclick = function name(params) {
                for(var i=0;i<downloadLinks.length;i++){
                    const iiframe = document.createElement("iframe");
                    iiframe.style.display = "none";
                    iiframe.style.height = 0;
                    iiframe.src = downloadLinks[i];
                    document.body.appendChild(iiframe);
                    setTimeout(()=>{
                        iiframe.remove();
                    }, 10000);
                }
            }
            iframes[0].parentNode.insertBefore(allDownloadTag,iframes[0])
        }
    },3000);
})();