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Youtube Multiscript

Returns youtube's old layout and adds a download button.

  1. // ==UserScript==
  2. // @name Youtube Multiscript
  3. // @description Returns youtube's old layout and adds a download button.
  4. // @author sk1pp3rFTW
  5. // @namespace https://pelican.gq/
  6. // @include http://www.youtube.com/*
  7. // @include https://www.youtube.com/*
  8. // @exclude http://www.youtube.com/embed/*
  9. // @exclude https://www.youtube.com/embed/*
  10. // @match http://www.youtube.com/*
  11. // @match https://www.youtube.com/*
  12. // @match http://s.ytimg.com/yts/jsbin/*
  13. // @match https://s.ytimg.com/yts/jsbin/*
  14. // @match http://manifest.googlevideo.com/*
  15. // @match https://manifest.googlevideo.com/*
  16. // @match http://*.googlevideo.com/videoplayback*
  17. // @match https://*.googlevideo.com/videoplayback*
  18. // @match http://*.youtube.com/videoplayback*
  19. // @match https://*.youtube.com/videoplayback*
  20. // @connect googlevideo.com
  21. // @connect ytimg.com
  22. // @grant GM_xmlhttpRequest
  23. // @grant GM_getValue
  24. // @grant GM_setValue
  25. // @run-at document-start
  26. // @license MIT License
  27. // @icon 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
  28. // @version 1.0.69
  29. // ==/UserScript==
  30. var url = window.location.href;
  31. if (url.indexOf("disable_polymer") === -1) {
  32.   if (url.indexOf("?") > 0) {
  33.     url += "&";
  34.   } else {
  35.     url += "?";
  36.   }
  37.   url += "disable_polymer=1";
  38.   window.location.href = url;
  39. }
  40.  
  41. (function () {
  42.   var FORMAT_LABEL={'18':'MP4 360p','22':'MP4 720p','43':'WebM 360p','44':'WebM 480p','45':'WebM 720p','46':'WebM 1080p','135':'MP4 480p - no audio','137':'MP4 1080p - no audio','138':'MP4 2160p - no audio','140':'M4A 128kbps - audio','264':'MP4 1440p - no audio','266':'MP4 2160p - no audio','298':'MP4 720p60 - no audio','299':'MP4 1080p60 - no audio'};
  43.   var FORMAT_TYPE={'18':'mp4','22':'mp4','43':'webm','44':'webm','45':'webm','46':'webm','135':'mp4','137':'mp4','138':'mp4','140':'m4a','264':'mp4','266':'mp4','298':'mp4','299':'mp4'};
  44.   var FORMAT_ORDER=['18','43','135','44','22','298','45','137','299','46','264','138','266','140'];
  45.   var FORMAT_RULE={'mp4':'all','webm':'none','m4a':'all'};
  46.   // all=display all versions, max=only highest quality version, none=no version
  47.   // the default settings show all MP4 videos
  48.   var SHOW_DASH_FORMATS=false;
  49.   var BUTTON_TEXT={'ar':'تنزيل','cs':'Stáhnout','de':'Herunterladen','en':'Download','es':'Descargar','fr':'Télécharger','hi':'डाउनलोड','hu':'Letöltés','id':'Unduh','it':'Scarica','ja':'ダウンロード','ko':'내려받기','pl':'Pobierz','pt':'Baixar','ro':'Descărcați','ru':'Скачать','tr':'İndir','zh':'下载','zh-TW':'下載'};
  50.   var BUTTON_TOOLTIP={'ar':'تنزيل هذا الفيديو','cs':'Stáhnout toto video','de':'Dieses Video herunterladen','en':'Download this video','es':'Descargar este vídeo','fr':'Télécharger cette vidéo','hi':'वीडियो डाउनलोड करें','hu':'Videó letöltése','id':'Unduh video ini','it':'Scarica questo video','ja':'このビデオをダウンロードする','ko':'이 비디오를 내려받기','pl':'Pobierz plik wideo','pt':'Baixar este vídeo','ro':'Descărcați acest videoclip','ru':'Скачать это видео','tr': 'Bu videoyu indir','zh':'下载此视频','zh-TW':'下載此影片'};
  51.   var DECODE_RULE=[];
  52.   var RANDOM=7489235179; // Math.floor(Math.random()*1234567890);
  53.   var CONTAINER_ID='download-youtube-video'+RANDOM;
  54.   var LISTITEM_ID='download-youtube-video-fmt'+RANDOM;
  55.   var BUTTON_ID='download-youtube-video-button'+RANDOM;
  56.   var DEBUG_ID='download-youtube-video-debug-info';
  57.   var STORAGE_URL='download-youtube-script-url';
  58.   var STORAGE_CODE='download-youtube-signature-code';
  59.   var STORAGE_DASH='download-youtube-dash-enabled';
  60.   var isDecodeRuleUpdated=false;
  61.  
  62.   start();
  63.  
  64. function start() {
  65.   var pagecontainer=document.getElementById('page-container');
  66.   if (!pagecontainer) return;
  67.   if (/^https?:\/\/www\.youtube.com\/watch\?/.test(window.location.href)) run();
  68.   var isAjax=/class[\w\s"'-=]+spf\-link/.test(pagecontainer.innerHTML);
  69.   var logocontainer=document.getElementById('logo-container');
  70.   if (logocontainer && !isAjax) { // fix for blocked videos
  71.     isAjax=(' '+logocontainer.className+' ').indexOf(' spf-link ')>=0;
  72.   }
  73.   var content=document.getElementById('content');
  74.   if (isAjax && content) { // Ajax UI
  75.       var mo=window.MutationObserver||window.WebKitMutationObserver;
  76.       if(typeof mo!=='undefined') {
  77.         var observer=new mo(function(mutations) {
  78.           mutations.forEach(function(mutation) {
  79.               if(mutation.addedNodes!==null) {
  80.                 for (var i=0; i<mutation.addedNodes.length; i++) {
  81.                     if (mutation.addedNodes[i].id=='watch7-main-container') { // || id=='watch7-container'
  82.                       run();
  83.                       break;
  84.                     }
  85.                 }
  86.               }
  87.           });
  88.         });
  89.         observer.observe(content, {childList: true, subtree: true}); // old value: pagecontainer
  90.       } else { // MutationObserver fallback for old browsers
  91.         pagecontainer.addEventListener('DOMNodeInserted', onNodeInserted, false);
  92.       }
  93.   }
  94. }
  95.  
  96. function onNodeInserted(e) {
  97.     if (e && e.target && (e.target.id=='watch7-main-container')) { // || id=='watch7-container'
  98.       run();
  99.   }
  100. }
  101.  
  102. function run() {
  103.   if (document.getElementById(CONTAINER_ID)) return; // check download container
  104.  
  105.   var videoID, videoFormats, videoAdaptFormats, videoManifestURL, scriptURL=null;
  106.   var isSignatureUpdatingStarted=false;
  107.   var operaTable=new Array();
  108.   var language=document.documentElement.getAttribute('lang');
  109.   var textDirection='left';
  110.   if (document.body.getAttribute('dir')=='rtl') {
  111.     textDirection='right';
  112.   }
  113.   if (document.getElementById('watch7-action-buttons')) {  // old UI
  114.     fixTranslations(language, textDirection);
  115.   }
  116.  
  117.   // obtain video ID, formats map
  118.  
  119.   var args=null;
  120.   var usw=(typeof this.unsafeWindow !== 'undefined')?this.unsafeWindow:window; // Firefox, Opera<15
  121.   if (usw.ytplayer && usw.ytplayer.config && usw.ytplayer.config.args) {
  122.     args=usw.ytplayer.config.args;
  123.   }
  124.   if (args) {
  125.     videoID=args['video_id'];
  126.     videoFormats=args['url_encoded_fmt_stream_map'];
  127.     videoAdaptFormats=args['adaptive_fmts'];
  128.     videoManifestURL=args['dashmpd'];
  129.     debug('DYVAM - Info: Standard mode. videoID '+(videoID?videoID:'none')+'; ');
  130.   }
  131.   if (usw.ytplayer && usw.ytplayer.config && usw.ytplayer.config.assets) {
  132.     scriptURL=usw.ytplayer.config.assets.js;
  133.   }
  134.  
  135.   if (videoID==null) { // unsafeWindow workaround (Chrome, Opera 15+)
  136.     var buffer=document.getElementById(DEBUG_ID+'2');
  137.     if (buffer) {
  138.       while (buffer.firstChild) {
  139.         buffer.removeChild(buffer.firstChild);
  140.       }
  141.     } else {
  142.       buffer=createHiddenElem('pre', DEBUG_ID+'2');
  143.     }
  144.     injectScript ('if(ytplayer&&ytplayer.config&&ytplayer.config.args){document.getElementById("'+DEBUG_ID+'2").appendChild(document.createTextNode(\'"video_id":"\'+ytplayer.config.args.video_id+\'", "js":"\'+ytplayer.config.assets.js+\'", "dashmpd":"\'+ytplayer.config.args.dashmpd+\'", "url_encoded_fmt_stream_map":"\'+ytplayer.config.args.url_encoded_fmt_stream_map+\'", "adaptive_fmts":"\'+ytplayer.config.args.adaptive_fmts+\'"\'));}');
  145.     var code=buffer.innerHTML;
  146.     if (code) {
  147.       videoID=findMatch(code, /\"video_id\":\s*\"([^\"]+)\"/);
  148.       videoFormats=findMatch(code, /\"url_encoded_fmt_stream_map\":\s*\"([^\"]+)\"/);
  149.       videoFormats=videoFormats.replace(/&amp;/g,'\\u0026');
  150.       videoAdaptFormats=findMatch(code, /\"adaptive_fmts\":\s*\"([^\"]+)\"/);
  151.       videoAdaptFormats=videoAdaptFormats.replace(/&amp;/g,'\\u0026');
  152.       videoManifestURL=findMatch(code, /\"dashmpd\":\s*\"([^\"]+)\"/);
  153.       scriptURL=findMatch(code, /\"js\":\s*\"([^\"]+)\"/);
  154.     }
  155.     debug('DYVAM - Info: Injection mode. videoID '+(videoID?videoID:'none')+'; ');
  156.   }
  157.  
  158.   if (videoID==null) { // if all else fails
  159.     var bodyContent=document.body.innerHTML;
  160.     if (bodyContent!=null) {
  161.       videoID=findMatch(bodyContent, /\"video_id\":\s*\"([^\"]+)\"/);
  162.       videoFormats=findMatch(bodyContent, /\"url_encoded_fmt_stream_map\":\s*\"([^\"]+)\"/);
  163.       videoAdaptFormats=findMatch(bodyContent, /\"adaptive_fmts\":\s*\"([^\"]+)\"/);
  164.       videoManifestURL=findMatch(bodyContent, /\"dashmpd\":\s*\"([^\"]+)\"/);
  165.       if (scriptURL==null) {
  166.         scriptURL=findMatch(bodyContent, /\"js\":\s*\"([^\"]+)\"/);
  167.         if (scriptURL) {
  168.           scriptURL=scriptURL.replace(/\\/g,'');
  169.         }
  170.       }
  171.     }
  172.     debug('DYVAM - Info: Brute mode. videoID '+(videoID?videoID:'none')+'; ');
  173.   }
  174.  
  175.   debug('DYVAM - Info: url '+window.location.href+'; useragent '+window.navigator.userAgent);
  176.  
  177.   if (videoID==null || videoFormats==null || videoID.length==0 || videoFormats.length==0) {
  178.    debug('DYVAM - Error: No config information found. YouTube must have changed the code.');
  179.    return;
  180.   }
  181.  
  182.   // Opera 12 extension message handler
  183.   if (typeof window.opera !== 'undefined' && window.opera && typeof opera.extension !== 'undefined') {
  184.     opera.extension.onmessage = function(event) {
  185.       var index=findMatch(event.data.action, /xhr\-([0-9]+)\-response/);
  186.       if (index && operaTable[parseInt(index,10)]) {
  187.         index=parseInt(index,10);
  188.         var trigger=(operaTable[index])['onload'];
  189.         if (typeof trigger === 'function' && event.data.readyState == 4) {
  190.           if (trigger) {
  191.               trigger(event.data);
  192.           }
  193.         }
  194.       }
  195.     }
  196.   }
  197.  
  198.   if (!isDecodeRuleUpdated) {
  199.     DECODE_RULE=getDecodeRules(DECODE_RULE);
  200.     isDecodeRuleUpdated=true;
  201.   }
  202.   if (scriptURL) {
  203.     scriptURL = absoluteURL(scriptURL);
  204.     debug('DYVAM - Info: Full script URL: '+scriptURL);
  205.     fetchSignatureScript(scriptURL);
  206.   }
  207.  
  208.    // video title
  209.    var videoTitle=document.title || 'video';
  210.    videoTitle=videoTitle.replace(/\s*\-\s*YouTube$/i, '').replace(/'/g, '\'').replace(/^\s+|\s+$/g, '').replace(/\.+$/g, '');
  211.    videoTitle=videoTitle.replace(/[:"\?\*]/g, '').replace(/[\|\\\/]/g, '_'); // Mac, Linux, Windows
  212.    if (((window.navigator.userAgent || '').toLowerCase()).indexOf('windows') >= 0) {
  213.       videoTitle=videoTitle.replace(/#/g, '').replace(/&/g, '_'); // Windows
  214.    } else {
  215.       videoTitle=videoTitle.replace(/#/g, '%23').replace(/&/g, '%26'); //  Mac, Linux
  216.    }
  217.  
  218.   // parse the formats map
  219.   var sep1='%2C', sep2='%26', sep3='%3D';
  220.   if (videoFormats.indexOf(',')>-1||videoFormats.indexOf('&')>-1||videoFormats.indexOf('\\u0026')>-1) {
  221.     sep1=',';
  222.     sep2=(videoFormats.indexOf('&')>-1)?'&':'\\u0026';
  223.     sep3='=';
  224.   }
  225.   var videoURL=new Array();
  226.   var videoSignature=new Array();
  227.   if (videoAdaptFormats) {
  228.     videoFormats=videoFormats+sep1+videoAdaptFormats;
  229.   }
  230.   var videoFormatsGroup=videoFormats.split(sep1);
  231.   for (var i=0;i<videoFormatsGroup.length;i++) {
  232.     var videoFormatsElem=videoFormatsGroup[i].split(sep2);
  233.     var videoFormatsPair=new Array();
  234.     for (var j=0;j<videoFormatsElem.length;j++) {
  235.       var pair=videoFormatsElem[j].split(sep3);
  236.       if (pair.length==2) {
  237.         videoFormatsPair[pair[0]]=pair[1];
  238.       }
  239.     }
  240.     if (videoFormatsPair['url']==null) continue;
  241.     var url=unescape(unescape(videoFormatsPair['url'])).replace(/\\\//g,'/').replace(/\\u0026/g,'&');
  242.     if (videoFormatsPair['itag']==null) continue;
  243.     var itag=videoFormatsPair['itag'];
  244.     var sig=videoFormatsPair['sig']||videoFormatsPair['signature'];
  245.     if (sig) {
  246.       url=url+'&signature='+sig;
  247.       videoSignature[itag]=null;
  248.     } else if (videoFormatsPair['s']) {
  249.       url=url+'&signature='+decryptSignature(videoFormatsPair['s']);
  250.       videoSignature[itag]=videoFormatsPair['s'];
  251.     }
  252.     if (url.toLowerCase().indexOf('ratebypass')==-1) { // speed up download for dash
  253.       url=url+'&ratebypass=yes';
  254.     }
  255.     if (url.toLowerCase().indexOf('http')==0) { // validate URL
  256.       videoURL[itag]=url+'&title='+videoTitle;
  257.     }
  258.   }
  259.  
  260.   var showFormat=new Array();
  261.   for (var category in FORMAT_RULE) {
  262.     var rule=FORMAT_RULE[category];
  263.     for (var index in FORMAT_TYPE){
  264.       if (FORMAT_TYPE[index]==category) {
  265.         showFormat[index]=(rule=='all');
  266.       }
  267.     }
  268.     if (rule=='max') {
  269.       for (var i=FORMAT_ORDER.length-1;i>=0;i--) {
  270.         var format=FORMAT_ORDER[i];
  271.         if (FORMAT_TYPE[format]==category && videoURL[format]!=undefined) {
  272.           showFormat[format]=true;
  273.           break;
  274.         }
  275.       }
  276.     }
  277.   }
  278.  
  279.   var dashPref=getPref(STORAGE_DASH);
  280.   if (dashPref=='1') {
  281.     SHOW_DASH_FORMATS=true;
  282.   } else if (dashPref!='0') {
  283.     setPref(STORAGE_DASH,'0');
  284.   }
  285.  
  286.   var downloadCodeList=[];
  287.   for (var i=0;i<FORMAT_ORDER.length;i++) {
  288.     var format=FORMAT_ORDER[i];
  289.     if (format=='37' && videoURL[format]==undefined) { // hack for dash 1080p
  290.       if (videoURL['137']) {
  291.        format='137';
  292.       }
  293.       showFormat[format]=showFormat['37'];
  294.     } else if (format=='38' && videoURL[format]==undefined) { // hack for dash 4K
  295.       if (videoURL['138'] && !videoURL['266']) {
  296.        format='138';
  297.       }
  298.       showFormat[format]=showFormat['38'];
  299.     }
  300.     if (!SHOW_DASH_FORMATS && format.length>2) continue;
  301.     if (videoURL[format]!=undefined && FORMAT_LABEL[format]!=undefined && showFormat[format]) {
  302.       downloadCodeList.push({url:videoURL[format],sig:videoSignature[format],format:format,label:FORMAT_LABEL[format]});
  303.       debug('DYVAM - Info: itag'+format+' url:'+videoURL[format]);
  304.     }
  305.   }
  306.  
  307.   if (downloadCodeList.length==0) {
  308.     debug('DYVAM - Error: No download URL found. Probably YouTube uses encrypted streams.');
  309.     return; // no format
  310.   }
  311.  
  312.   // find parent container
  313.   var newWatchPage=false;
  314.   var parentElement=document.getElementById('watch7-action-buttons');
  315.   if (parentElement==null) {
  316.     parentElement=document.getElementById('watch8-secondary-actions');
  317.     if (parentElement==null) {
  318.       debug('DYVAM Error - No container for adding the download button. YouTube must have changed the code.');
  319.       return;
  320.     } else {
  321.       newWatchPage=true;
  322.     }
  323.   }
  324.  
  325.   // get button labels
  326.   var buttonText=(BUTTON_TEXT[language])?BUTTON_TEXT[language]:BUTTON_TEXT['en'];
  327.   var buttonLabel=(BUTTON_TOOLTIP[language])?BUTTON_TOOLTIP[language]:BUTTON_TOOLTIP['en'];
  328.  
  329.   // generate download code for regular interface
  330.   var mainSpan=document.createElement('span');
  331.  
  332.   if (newWatchPage) {
  333.     var spanIcon=document.createElement('span');
  334.     spanIcon.setAttribute('class', 'yt-uix-button-icon-wrapper');
  335.     var imageIcon=document.createElement('img');
  336.     imageIcon.setAttribute('src', '//s.ytimg.com/yt/img/pixel-vfl3z5WfW.gif');
  337.     imageIcon.setAttribute('class', 'yt-uix-button-icon');
  338.     imageIcon.setAttribute('style', 'width:20px;height:20px;background-size:20px 20px;background-repeat:no-repeat;background-image: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACAAAAAgCAYAAABzenr0AAABG0lEQVRYR+2W0Q3CMAxE2wkYAdiEEWADmIxuACMwCmzABpCTEmRSO7YTQX+ChECV43t2nF7GYeHPuLD+0AKwC/DnWMAp/N5qimkBuAfBdRTF/+2/AV6ZYFUxVYuicAfoHegd6B3oHfhZB+ByF+JyV8FkrAB74pqH3DU5L3iGoBURhdVODIQF4EjEkWLmmhYALOQgNIBcHHke4buhxXAAaFnaAhqbQ5QAOHHkwhZ8balkx1ICCiEBWNZ+CivdB7REHIC2ZjZK2oWklDDdB1NSdCd/Js2PqQMpSIKYVcM8kE6QCwDBNRCqOBJrW0CL8kCYxL0A1k6YxWsANAiXeC2ABOEWbwHAWrwxpzgkmA/JtIqnxTOElmPnjlkc4A3FykAhA42AxwAAAABJRU5ErkJggg==);');
  339.     spanIcon.appendChild(imageIcon);
  340.     mainSpan.appendChild(spanIcon);
  341.   }
  342.  
  343.   var spanButton=document.createElement('span');
  344.   spanButton.setAttribute('class', 'yt-uix-button-content');
  345.   spanButton.appendChild(document.createTextNode(buttonText+' '));
  346.   mainSpan.appendChild(spanButton);
  347.  
  348.   if (!newWatchPage) { // old UI
  349.     var imgButton=document.createElement('img');
  350.     imgButton.setAttribute('class', 'yt-uix-button-arrow');
  351.     imgButton.setAttribute('src', '//s.ytimg.com/yt/img/pixel-vfl3z5WfW.gif');
  352.     mainSpan.appendChild(imgButton);
  353.   }
  354.  
  355.   var listItems=document.createElement('ol');
  356.   listItems.setAttribute('style', 'display:none;');
  357.   listItems.setAttribute('class', 'yt-uix-button-menu');
  358.   for (var i=0;i<downloadCodeList.length;i++) {
  359.     var listItem=document.createElement('li');
  360.     var listLink=document.createElement('a');
  361.     listLink.setAttribute('style', 'text-decoration:none;');
  362.     listLink.setAttribute('href', downloadCodeList[i].url);
  363.     listLink.setAttribute('download', videoTitle+'.'+FORMAT_TYPE[downloadCodeList[i].format]);
  364.     var listButton=document.createElement('span');
  365.     listButton.setAttribute('class', 'yt-uix-button-menu-item');
  366.     listButton.setAttribute('loop', i+'');
  367.     listButton.setAttribute('id', LISTITEM_ID+downloadCodeList[i].format);
  368.     listButton.appendChild(document.createTextNode(downloadCodeList[i].label));
  369.     listLink.appendChild(listButton);
  370.     listItem.appendChild(listLink);
  371.     listItems.appendChild(listItem);
  372.   }
  373.   mainSpan.appendChild(listItems);
  374.   var buttonElement=document.createElement('button');
  375.   buttonElement.setAttribute('id', BUTTON_ID);
  376.   if (newWatchPage) {
  377.     buttonElement.setAttribute('class', 'yt-uix-button  yt-uix-button-size-default yt-uix-button-opacity yt-uix-tooltip');
  378.   } else { // old UI
  379.     buttonElement.setAttribute('class', 'yt-uix-button yt-uix-tooltip yt-uix-button-empty yt-uix-button-text');
  380.     buttonElement.setAttribute('style', 'margin-top:4px; margin-left:'+((textDirection=='left')?5:10)+'px;');
  381.   }
  382.   buttonElement.setAttribute('data-tooltip-text', buttonLabel);
  383.   buttonElement.setAttribute('type', 'button');
  384.   buttonElement.setAttribute('role', 'button');
  385.   buttonElement.addEventListener('click', function(){return false;}, false);
  386.   buttonElement.appendChild(mainSpan);
  387.   var containerSpan=document.createElement('span');
  388.   containerSpan.setAttribute('id', CONTAINER_ID);
  389.   containerSpan.appendChild(document.createTextNode(' '));
  390.   containerSpan.appendChild(buttonElement);
  391.  
  392.   // add the button
  393.   if (!newWatchPage) { // watch7
  394.     parentElement.appendChild(containerSpan);
  395.   } else { // watch8
  396.     parentElement.insertBefore(containerSpan, parentElement.firstChild);
  397.   }
  398.  
  399.   // REPLACEWITH if (!isSignatureUpdatingStarted) {
  400.     for (var i=0;i<downloadCodeList.length;i++) {
  401.       addFileSize(downloadCodeList[i].url, downloadCodeList[i].format);
  402.     }
  403.   // }
  404.  
  405.   if (typeof GM_download !== 'undefined') {
  406.     for (var i=0;i<downloadCodeList.length;i++) {
  407.       var downloadFMT=document.getElementById(LISTITEM_ID+downloadCodeList[i].format);
  408.       var url=(downloadCodeList[i].url).toLowerCase();
  409.       if (url.indexOf('clen=')>0 && url.indexOf('dur=')>0 && url.indexOf('gir=')>0
  410.           && url.indexOf('lmt=')>0) {
  411.         downloadFMT.addEventListener('click', downloadVideoNatively, false);
  412.       }
  413.     }
  414.   }
  415.  
  416.   addFromManifest();
  417.  
  418.   function downloadVideoNatively(e) {
  419.     var elem=e.currentTarget;
  420.     e.returnValue=false;
  421.     if (e.preventDefault) {
  422.       e.preventDefault();
  423.     }
  424.     var loop=elem.getAttribute('loop');
  425.     if (loop) {
  426.       GM_download(downloadCodeList[loop].url, videoTitle+'.'+FORMAT_TYPE[downloadCodeList[loop].format]);
  427.     }
  428.     return false;
  429.   }
  430.  
  431.   function addFromManifest() { // add Dash URLs from manifest file
  432.     var formats=['137', '138', '140']; // 137=1080p, 138=4k, 140=m4a
  433.     var isNecessary=true;
  434.     for (var i=0;i<formats.length;i++) {
  435.       if (videoURL[formats[i]]) {
  436.         isNecessary=false;
  437.         break;
  438.       }
  439.     }
  440.     if (videoManifestURL && SHOW_DASH_FORMATS && isNecessary) {
  441.       var matchSig=findMatch(videoManifestURL, /\/s\/([a-zA-Z0-9\.]+)\//i);
  442.       if (matchSig) {
  443.         var decryptedSig=decryptSignature(matchSig);
  444.         if (decryptedSig) {
  445.           videoManifestURL=videoManifestURL.replace('/s/'+matchSig+'/','/signature/'+decryptedSig+'/');
  446.         }
  447.       }
  448.       videoManifestURL=absoluteURL(videoManifestURL);
  449.       debug('DYVAM - Info: manifestURL '+videoManifestURL);
  450.       crossXmlHttpRequest({
  451.           method:'GET',
  452.           url:videoManifestURL, // check if URL exists
  453.           onload:function(response) {
  454.             if (response.readyState === 4 && response.status === 200 && response.responseText) {
  455.               debug('DYVAM - Info: maniestFileContents '+response.responseText);
  456.               var lastFormatFromList=downloadCodeList[downloadCodeList.length-1].format;
  457.               debug('DYVAM - Info: lastformat: '+lastFormatFromList);
  458.               for (var i=0;i<formats.length;i++) {
  459.                 k=formats[i];
  460.                 if (videoURL[k] || showFormat[k]==false) continue;
  461.                 var regexp = new RegExp('<BaseURL>(http[^<]+itag\\/'+k+'[^<]+)<\\/BaseURL>','i');
  462.                 var matchURL=findMatch(response.responseText, regexp);
  463.                 debug('DYVAM - Info: matchURL itag= '+k+' url= '+matchURL);
  464.                 if (!matchURL) continue;
  465.                 matchURL=matchURL.replace(/&amp\;/g,'&');
  466.                 // ...
  467.                 downloadCodeList.push(
  468.                   {url:matchURL,sig:videoSignature[k],format:k,label:FORMAT_LABEL[k]});
  469.                 var downloadFMT=document.getElementById(LISTITEM_ID+lastFormatFromList);
  470.                 var clone=downloadFMT.parentNode.parentNode.cloneNode(true);
  471.                 clone.firstChild.firstChild.setAttribute('id', LISTITEM_ID+k);
  472.                 clone.firstChild.setAttribute('href', matchURL);
  473.                 downloadFMT.parentNode.parentNode.parentNode.appendChild(clone);
  474.                 downloadFMT=document.getElementById(LISTITEM_ID+k);
  475.                 downloadFMT.firstChild.nodeValue=FORMAT_LABEL[k];
  476.                 addFileSize(matchURL, k);
  477.                 lastFormatFromList=k;
  478.               }
  479.             }
  480.           }
  481.         });
  482.     }
  483.   }
  484.  
  485.   function injectStyle(code) {
  486.     var style=document.createElement('style');
  487.     style.type='text/css';
  488.     style.appendChild(document.createTextNode(code));
  489.     document.getElementsByTagName('head')[0].appendChild(style);
  490.   }
  491.  
  492.   function injectScript(code) {
  493.     var script=document.createElement('script');
  494.     script.type='application/javascript';
  495.     script.textContent=code;
  496.     document.body.appendChild(script);
  497.     document.body.removeChild(script);
  498.   }
  499.  
  500.   function debug(str) {
  501.     var debugElem=document.getElementById(DEBUG_ID);
  502.     if (!debugElem) {
  503.       debugElem=createHiddenElem('div', DEBUG_ID);
  504.     }
  505.     debugElem.appendChild(document.createTextNode(str+' '));
  506.   }
  507.  
  508.   function createHiddenElem(tag, id) {
  509.     var elem=document.createElement(tag);
  510.     elem.setAttribute('id', id);
  511.     elem.setAttribute('style', 'display:none;');
  512.     document.body.appendChild(elem);
  513.     return elem;
  514.   }
  515.  
  516.   function fixTranslations(language, textDirection) {
  517.     if (/^af|bg|bn|ca|cs|de|el|es|et|eu|fa|fi|fil|fr|gl|hi|hr|hu|id|it|iw|kn|lv|lt|ml|mr|ms|nl|pl|ro|ru|sl|sk|sr|sw|ta|te|th|uk|ur|vi|zu$/.test(language)) { // fix international UI
  518.       var likeButton=document.getElementById('watch-like');
  519.       if (likeButton) {
  520.         var spanElements=likeButton.getElementsByClassName('yt-uix-button-content');
  521.         if (spanElements) {
  522.           spanElements[0].style.display='none'; // hide like text
  523.         }
  524.       }
  525.       var marginPixels=10;
  526.       if (/^bg|ca|cs|el|eu|hr|it|ml|ms|pl|sl|sw|te$/.test(language)) {
  527.         marginPixels=1;
  528.       }
  529.       injectStyle('#watch7-secondary-actions .yt-uix-button{margin-'+textDirection+':'+marginPixels+'px!important}');
  530.     }
  531.   }
  532.  
  533.   function findMatch(text, regexp) {
  534.     var matches=text.match(regexp);
  535.     return (matches)?matches[1]:null;
  536.   }
  537.  
  538.   function isString(s) {
  539.     return (typeof s==='string' || s instanceof String);
  540.   }
  541.  
  542.   function isInteger(n) {
  543.     return (typeof n==='number' && n%1==0);
  544.   }
  545.  
  546.   function absoluteURL(url) {
  547.     var link = document.createElement('a');
  548.     link.href = url;
  549.     return link.href;
  550.   }
  551.  
  552.   function getPref(name) { // cross-browser GM_getValue
  553.     var a='', b='';
  554.     try {a=typeof GM_getValue.toString; b=GM_getValue.toString()} catch(e){}
  555.     if (typeof GM_getValue === 'function' &&
  556.     (a === 'undefined' || b.indexOf('not supported') === -1)) {
  557.       return GM_getValue(name, null); // Greasemonkey, Tampermonkey, Firefox extension
  558.     } else {
  559.         var ls=null;
  560.         try {ls=window.localStorage||null} catch(e){}
  561.         if (ls) {
  562.           return ls.getItem(name); // Chrome script, Opera extensions
  563.         }
  564.     }
  565.     return;
  566.   }
  567.  
  568.   function setPref(name, value) { //  cross-browser GM_setValue
  569.     var a='', b='';
  570.     try {a=typeof GM_setValue.toString; b=GM_setValue.toString()} catch(e){}
  571.     if (typeof GM_setValue === 'function' &&
  572.     (a === 'undefined' || b.indexOf('not supported') === -1)) {
  573.       GM_setValue(name, value); // Greasemonkey, Tampermonkey, Firefox extension
  574.     } else {
  575.         var ls=null;
  576.         try {ls=window.localStorage||null} catch(e){}
  577.         if (ls) {
  578.           return ls.setItem(name, value); // Chrome script, Opera extensions
  579.         }
  580.     }
  581.   }
  582.  
  583.   function crossXmlHttpRequest(details) { // cross-browser GM_xmlhttpRequest
  584.     if (typeof GM_xmlhttpRequest === 'function') { // Greasemonkey, Tampermonkey, Firefox extension, Chrome script
  585.       GM_xmlhttpRequest(details);
  586.     } else if (typeof window.opera !== 'undefined' && window.opera && typeof opera.extension !== 'undefined' &&
  587.                typeof opera.extension.postMessage !== 'undefined') { // Opera 12 extension
  588.         var index=operaTable.length;
  589.         opera.extension.postMessage({'action':'xhr-'+index, 'url':details.url, 'method':details.method});
  590.         operaTable[index]=details;
  591.     } else if (typeof window.opera === 'undefined' && typeof XMLHttpRequest === 'function') { // Opera 15+ extension
  592.         var xhr=new XMLHttpRequest();
  593.         xhr.onreadystatechange = function() {
  594.           if (xhr.readyState == 4) {
  595.             if (details['onload']) {
  596.               details['onload'](xhr);
  597.             }
  598.           }
  599.         }
  600.         xhr.open(details.method, details.url, true);
  601.         xhr.send();
  602.     }
  603.   }
  604.  
  605.   function addFileSize(url, format) {
  606.  
  607.     function updateVideoLabel(size, format) {
  608.       var elem=document.getElementById(LISTITEM_ID+format);
  609.       if (elem) {
  610.         size=parseInt(size,10);
  611.         if (size>=1073741824) {
  612.           size=parseFloat((size/1073741824).toFixed(1))+' GB';
  613.         } else if (size>=1048576) {
  614.           size=parseFloat((size/1048576).toFixed(1))+' MB';
  615.         } else {
  616.           size=parseFloat((size/1024).toFixed(1))+' KB';
  617.         }
  618.         if (elem.childNodes.length>1) {
  619.             elem.lastChild.nodeValue=' ('+size+')';
  620.         } else if (elem.childNodes.length==1) {
  621.             elem.appendChild(document.createTextNode(' ('+size+')'));
  622.         }
  623.       }
  624.     }
  625.  
  626.     var matchSize=findMatch(url, /[&\?]clen=([0-9]+)&/i);
  627.     if (matchSize) {
  628.       updateVideoLabel(matchSize, format);
  629.     } else {
  630.       try {
  631.         crossXmlHttpRequest({
  632.           method:'HEAD',
  633.           url:url,
  634.           onload:function(response) {
  635.             if (response.readyState == 4 && response.status == 200) { // add size
  636.               var size=0;
  637.               if (typeof response.getResponseHeader === 'function') {
  638.                 size=response.getResponseHeader('Content-length');
  639.               } else if (response.responseHeaders) {
  640.                   var regexp = new RegExp('^Content\-length: (.*)$','im');
  641.                   var match = regexp.exec(response.responseHeaders);
  642.                   if (match) {
  643.                     size=match[1];
  644.                   }
  645.               }
  646.               if (size) {
  647.                 updateVideoLabel(size, format);
  648.               }
  649.             }
  650.           }
  651.         });
  652.       } catch(e) { }
  653.     }
  654.   }
  655.  
  656.   function findSignatureCode(sourceCode) {
  657.     debug('DYVAM - Info: signature start '+getPref(STORAGE_CODE));
  658.     var signatureFunctionName =
  659.     findMatch(sourceCode,
  660.     /\.set\s*\("signature"\s*,\s*([a-zA-Z0-9_$][\w$]*)\(/)
  661.     || findMatch(sourceCode,
  662.     /\.sig\s*\|\|\s*([a-zA-Z0-9_$][\w$]*)\(/)
  663.     || findMatch(sourceCode,
  664.     /\.signature\s*=\s*([a-zA-Z_$][\w$]*)\([a-zA-Z_$][\w$]*\)/); //old
  665.     if (signatureFunctionName == null) return setPref(STORAGE_CODE, 'error');
  666.     signatureFunctionName=signatureFunctionName.replace('$','\\$');
  667.     var regCode = new RegExp(signatureFunctionName + '\\s*=\\s*function' +
  668.     '\\s*\\([\\w$]*\\)\\s*{[\\w$]*=[\\w$]*\\.split\\(""\\);\n*(.+);return [\\w$]*\\.join');
  669.     var regCode2 = new RegExp('function \\s*' + signatureFunctionName +
  670.     '\\s*\\([\\w$]*\\)\\s*{[\\w$]*=[\\w$]*\\.split\\(""\\);\n*(.+);return [\\w$]*\\.join');
  671.     var functionCode = findMatch(sourceCode, regCode) || findMatch(sourceCode, regCode2);
  672.     debug('DYVAM - Info: signaturefunction ' + signatureFunctionName + ' -- ' + functionCode);
  673.     if (functionCode == null) return setPref(STORAGE_CODE, 'error');
  674.  
  675.     var reverseFunctionName = findMatch(sourceCode,
  676.     /([\w$]*)\s*:\s*function\s*\(\s*[\w$]*\s*\)\s*{\s*(?:return\s*)?[\w$]*\.reverse\s*\(\s*\)\s*}/);
  677.     debug('DYVAM - Info: reversefunction ' + reverseFunctionName);
  678.     if (reverseFunctionName) reverseFunctionName=reverseFunctionName.replace('$','\\$');
  679.     var sliceFunctionName = findMatch(sourceCode,
  680.     /([\w$]*)\s*:\s*function\s*\(\s*[\w$]*\s*,\s*[\w$]*\s*\)\s*{\s*(?:return\s*)?[\w$]*\.(?:slice|splice)\(.+\)\s*}/);
  681.     debug('DYVAM - Info: slicefunction ' + sliceFunctionName);
  682.     if (sliceFunctionName) sliceFunctionName=sliceFunctionName.replace('$','\\$');
  683.  
  684.     var regSlice = new RegExp('\\.(?:'+'slice'+(sliceFunctionName?'|'+sliceFunctionName:'')+
  685.     ')\\s*\\(\\s*(?:[a-zA-Z_$][\\w$]*\\s*,)?\\s*([0-9]+)\\s*\\)'); // .slice(5) sau .Hf(a,5)
  686.     var regReverse = new RegExp('\\.(?:'+'reverse'+(reverseFunctionName?'|'+reverseFunctionName:'')+
  687.     ')\\s*\\([^\\)]*\\)');  // .reverse() sau .Gf(a,45)
  688.     var regSwap = new RegExp('[\\w$]+\\s*\\(\\s*[\\w$]+\\s*,\\s*([0-9]+)\\s*\\)');
  689.     var regInline = new RegExp('[\\w$]+\\[0\\]\\s*=\\s*[\\w$]+\\[([0-9]+)\\s*%\\s*[\\w$]+\\.length\\]');
  690.     var functionCodePieces=functionCode.split(';');
  691.     var decodeArray=[];
  692.     for (var i=0; i<functionCodePieces.length; i++) {
  693.       functionCodePieces[i]=functionCodePieces[i].trim();
  694.       var codeLine=functionCodePieces[i];
  695.       if (codeLine.length>0) {
  696.         var arrSlice=codeLine.match(regSlice);
  697.         var arrReverse=codeLine.match(regReverse);
  698.         debug(i+': '+codeLine+' --'+(arrSlice?' slice length '+arrSlice.length:'') +' '+(arrReverse?'reverse':''));
  699.         if (arrSlice && arrSlice.length >= 2) { // slice
  700.         var slice=parseInt(arrSlice[1], 10);
  701.         if (isInteger(slice)){
  702.           decodeArray.push(-slice);
  703.         } else return setPref(STORAGE_CODE, 'error');
  704.       } else if (arrReverse && arrReverse.length >= 1) { // reverse
  705.         decodeArray.push(0);
  706.       } else if (codeLine.indexOf('[0]') >= 0) { // inline swap
  707.           if (i+2<functionCodePieces.length &&
  708.           functionCodePieces[i+1].indexOf('.length') >= 0 &&
  709.           functionCodePieces[i+1].indexOf('[0]') >= 0) {
  710.             var inline=findMatch(functionCodePieces[i+1], regInline);
  711.             inline=parseInt(inline, 10);
  712.             decodeArray.push(inline);
  713.             i+=2;
  714.           } else return setPref(STORAGE_CODE, 'error');
  715.       } else if (codeLine.indexOf(',') >= 0) { // swap
  716.         var swap=findMatch(codeLine, regSwap);
  717.         swap=parseInt(swap, 10);
  718.         if (isInteger(swap) && swap>0){
  719.           decodeArray.push(swap);
  720.         } else return setPref(STORAGE_CODE, 'error');
  721.       } else return setPref(STORAGE_CODE, 'error');
  722.       }
  723.     }
  724.  
  725.     if (decodeArray) {
  726.       setPref(STORAGE_URL, scriptURL);
  727.       setPref(STORAGE_CODE, decodeArray.toString());
  728.       DECODE_RULE=decodeArray;
  729.       debug('DYVAM - Info: signature '+decodeArray.toString()+' '+scriptURL);
  730.       // update download links and add file sizes
  731.       for (var i=0;i<downloadCodeList.length;i++) {
  732.         var elem=document.getElementById(LISTITEM_ID+downloadCodeList[i].format);
  733.         var url=downloadCodeList[i].url;
  734.         var sig=downloadCodeList[i].sig;
  735.         if (elem && url && sig) {
  736.           url=url.replace(/\&signature=[\w\.]+/, '&signature='+decryptSignature(sig));
  737.           elem.parentNode.setAttribute('href', url);
  738.           addFileSize(url, downloadCodeList[i].format);
  739.         }
  740.       }
  741.     }
  742.   }
  743.  
  744.   function isValidSignatureCode(arr) { // valid values: '5,-3,0,2,5', 'error'
  745.     if (!arr) return false;
  746.     if (arr=='error') return true;
  747.     arr=arr.split(',');
  748.     for (var i=0;i<arr.length;i++) {
  749.       if (!isInteger(parseInt(arr[i],10))) return false;
  750.     }
  751.     return true;
  752.   }
  753.  
  754.   function fetchSignatureScript(scriptURL) {
  755.     var storageURL=getPref(STORAGE_URL);
  756.     var storageCode=getPref(STORAGE_CODE);
  757.     if (!(/,0,|^0,|,0$|\-/.test(storageCode))) storageCode=null; // hack for only positive items
  758.     if (storageCode && isValidSignatureCode(storageCode) && storageURL &&
  759.         scriptURL==absoluteURL(storageURL)) return;
  760.     try {
  761.       debug('DYVAM fetch '+scriptURL);
  762.       isSignatureUpdatingStarted=true;
  763.       crossXmlHttpRequest({
  764.         method:'GET',
  765.         url:scriptURL,
  766.         onload:function(response) {
  767.           debug('DYVAM fetch status '+response.status);
  768.           if (response.readyState === 4 && response.status === 200 && response.responseText) {
  769.             findSignatureCode(response.responseText);
  770.           }
  771.         }
  772.       });
  773.     } catch(e) { }
  774.   }
  775.  
  776.   function getDecodeRules(rules) {
  777.     var storageCode=getPref(STORAGE_CODE);
  778.     if (storageCode && storageCode!='error' && isValidSignatureCode(storageCode)) {
  779.       var arr=storageCode.split(',');
  780.       for (var i=0; i<arr.length; i++) {
  781.         arr[i]=parseInt(arr[i], 10);
  782.       }
  783.       rules=arr;
  784.       debug('DYVAM - Info: signature '+arr.toString()+' '+scriptURL);
  785.     }
  786.     return rules;
  787.   }
  788.  
  789.   function decryptSignature(sig) {
  790.     function swap(a,b){var c=a[0];a[0]=a[b%a.length];a[b]=c;return a};
  791.     function decode(sig, arr) { // encoded decryption
  792.       if (!isString(sig)) return null;
  793.       var sigA=sig.split('');
  794.       for (var i=0;i<arr.length;i++) {
  795.         var act=arr[i];
  796.         if (!isInteger(act)) return null;
  797.         sigA=(act>0)?swap(sigA, act):((act==0)?sigA.reverse():sigA.slice(-act));
  798.       }
  799.       var result=sigA.join('');
  800.       return result;
  801.     }
  802.  
  803.     if (sig==null) return '';
  804.     var arr=DECODE_RULE;
  805.     if (arr) {
  806.       var sig2=decode(sig, arr);
  807.       if (sig2) return sig2;
  808.     } else {
  809.       setPref(STORAGE_URL, '');
  810.       setPref(STORAGE_CODE, '');
  811.     }
  812.     return sig;
  813.   }
  814.  
  815.   }
  816.  
  817. })();
  818.  

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