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Xuetangx Caption Crawler

Download Xuetangx Captions

  1. // ==UserScript==
  2. // @name         Xuetangx Caption Crawler
  3. // @namespace    http://tampermonkey.net/
  4. // @version      0.1
  5. // @description  Download Xuetangx Captions
  6. // @author       RabbitHu
  7. // @match        http://*.xuetangx.com/*
  8. // @grant        none
  9. // ==/UserScript==
  10.  
  11.  
  12. var close_after_download = false;
  13.  
  14. function fake_click(obj) {
  15.     var ev = document.createEvent("MouseEvents");
  16.     ev.initMouseEvent(
  17.         "click", true, false, window, 0, 0, 0, 0, 0, false, false, false, false, 0, null
  18.     );
  19.     obj.dispatchEvent(ev);
  20. }
  21.  
  22. function download(name, data) {
  23.     var urlObject = window.URL || window.webkitURL || window;
  24.  
  25.     var downloadData = new Blob([data]);
  26.  
  27.     var save_link = document.createElementNS("http://www.w3.org/1999/xhtml", "a")
  28.     save_link.href = urlObject.createObjectURL(downloadData);
  29.     save_link.download = name;
  30.     fake_click(save_link);
  31. }
  32.  
  33. function download_caption(){
  34.     document.getElementsByClassName('xt_video_player_word_break')[0].click();
  35.     var title = document.getElementsByClassName('active')[2].innerText.split('\n')[0];
  36.     var caption = document.getElementsByClassName('xt_video_player_caption_aside')[0].innerText;
  37.     download(title + ".txt", caption);
  38.     if(close_after_download) window.close();
  39. }
  40.  
  41. function try_download_caption(){
  42.     var try_download_caption_interval = setInterval(function(){
  43.         if(document.getElementsByClassName('xt_video_player_word_break').length){
  44.             download_caption();
  45.             try_download_caption_interval = window.clearInterval(try_download_caption_interval);
  46.         }
  47.         console.log('try_download_caption');
  48.     }, 100);
  49. }
  50.  
  51. function create_download_button(){
  52.     if(!document.getElementsByClassName('wrapper-downloads')[0]) return;
  53.     var li_element = document.createElement("li");
  54.     var a_element = document.createElement("a");
  55.     a_element.onclick = function(){
  56.         try_download_caption();
  57.     }
  58.     a_element.setAttribute("one-link-mark","yes");
  59.     li_element.setAttribute("class", "video-tracks video-download-button");
  60.     a_element.innerHTML = "下载本节字幕";
  61.     li_element.appendChild(a_element);
  62.     document.getElementsByClassName('wrapper-downloads')[0].appendChild(li_element);
  63. }
  64.  
  65. function create_download_all_button(){
  66.     if(!document.getElementsByClassName('wrapper-downloads')[0]) return;
  67.     var li_element = document.createElement("li");
  68.     var a_element = document.createElement("a");
  69.     a_element.onclick = function(){
  70.         var msg = "接下来将打开多个新标签页用于下载字幕。如果未能成功下载/只能下载一个字幕文件，请检查浏览器是否拦截了弹窗（一般会在地址栏右边有标志）。";
  71.         if (confirm(msg)==true){
  72. 			console.log('Download All!');
  73.             download_all();
  74. 		}
  75.     }
  76.     a_element.setAttribute("one-link-mark","yes");
  77.     li_element.setAttribute("class", "video-tracks video-download-button");
  78.     a_element.innerHTML = "下载课程全部字幕";
  79.     li_element.appendChild(a_element);
  80.     document.getElementsByClassName('wrapper-downloads')[0].appendChild(li_element);
  81. }
  82.  
  83. function instant_download(){
  84.     console.log('Instant Download Running...');
  85.     try_download_caption();
  86.     //window.close();
  87. }
  88.  
  89. function download_all(){
  90.     var navs = document.getElementsByTagName('nav');
  91.     var course_nav = navs[0];
  92.     for(var i = 0; i < navs.length; i++){
  93.         if(navs[i].ariaLabel){
  94.             course_nav = navs[i];
  95.         }
  96.     }
  97.     var str = course_nav.innerHTML;
  98.     console.log(str);
  99.     var urls = Array.from(str.matchAll('href *= *"/(.*)/"'));
  100.     var open_windows = [];
  101.     var cur_url_index = 0, max_open_windows = 5;
  102.     var open_window_url = setInterval(function(){
  103.         for(var i = 0; i < max_open_windows; i++){
  104.             if(!!open_windows[i] && open_windows[i].closed){
  105.                 open_windows[i] = null;
  106.             }
  107.             if(!open_windows[i] && cur_url_index < urls.length){
  108.                 open_windows[i] = window.open('http://' + window.location.href.split('/')[2] + '/' + urls[cur_url_index][1] + '?instant_download');
  109.                 cur_url_index++;
  110.             }
  111.         }
  112.         if(cur_url_index >= urls.length){
  113.             open_window_url = window.clearInterval(open_window_url);
  114.         }
  115.     }, 100);
  116. }
  117.  
  118. window.onload = function(){
  119.     console.log('Xuetangx Caption Crawler Running!');
  120.     create_download_button();
  121.     create_download_all_button();
  122.     const urlParams = new URLSearchParams(window.location.search);
  123.     if(urlParams.has('instant_download')){
  124.         if(!document.getElementsByClassName('seq_video').length){
  125.             window.close();
  126.         }
  127.         close_after_download = true;
  128.         instant_download();
  129.     }
  130. }