File size: 6,597 Bytes
4b876a7 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 | /**
* Filename: videodownloader.js
* Purpose : This will parse the encoded video data and will allow users to download
* Project : Cefalo School
* Author : beroza@cefalo.com
* Version : 1.0
* Copyright (c) 2015 Cefalo School
*/
/**
* Purpose : Replace all instances of input string.
* @access : public
* @params : inputString, stringToFind, replaceWithString
* @return : string;
*/
function youtubeReplaceAllString(inputString, stringToFind, replaceWithString)
{
var thisRegExp = new RegExp(stringToFind, 'g');
return inputString.replace(thisRegExp, replaceWithString);
}
/**
* Purpose : Loop through each video and create the downloadable link (add a block after video).
* @access : public
* @params : videoList
*/
function youtubeAddBlock(videoList)
{
var title = 'saved video';
var videoTitle = document.getElementById('watch-headline-title');
if(videoTitle != null){
title = videoTitle.children[0].innerText;
}
var html = '<div id="download-youtube-chrome-extension" class="yt-card yt-card-has-padding">';
html = html + '<div style="padding: 5px; border-bottom: 1px solid #CCC;">Click on the format to download the video:</div>';
html = html + '<div style="padding: 5px; font-weight: bold;">';
var counter = 0;
for(i in videoList){
var video = videoList[i];
if(video.url != '' && video.url.indexOf('http') == 0)
{
if(counter != 0) html = html + ' | ';
if(typeof video.formatObject == 'undefined')
{
html = html + '<span><a href="' + video.url + '&title='+youtubeReplaceAllString(title,'"','%22')+'">Unknown Format</a></span>';
}
else{
html = html + '<span><a href="' + video.url + '&title='+youtubeReplaceAllString(title,'"','%22')+' [' + video.formatObject.resolution + 'p]">' + video.formatObject.resolution + 'p ' + video.formatObject.format + '</a></span>';
}
counter++;
}
}
html = html + '</div>';
html = html + '</div>';
var wpDiv = document.getElementById('watch7-content');
if(wpDiv != null){
wpDiv.innerHTML = html + wpDiv.innerHTML;
}
}
/**
* Purpose : Fetch encoded youtube video data and prepare array of video object.
* @access : public
* @params : undefined
* @return : array of video objects;
*/
function youtubeGetVideoList()
{
try{
var videoFormats = {
5: { itag: 5, resolution: 224, format: "FLV"},
6: { itag: 6, resolution: 270, format: "FLV"},
13: { itag: 13, resolution: 144, format: "3GP"},
17: { itag: 17, resolution: 144, format: "3GP"},
18: { itag: 18, resolution: 360, format: "MP4"},
22: { itag: 22, resolution: 720, format: "MP4"},
34: { itag: 34, resolution: 360, format: "FLV"},
35: { itag: 35, resolution: 480, format: "FLV"},
36: { itag: 36, resolution: 240, format: "3GP"},
37: { itag: 37, resolution: 1080, format: "MP4"},
38: { itag: 38, resolution: 2304, format: "MP4"},
43: { itag: 43, resolution: 360, format: "WebM"},
44: { itag: 44, resolution: 480, format: "WebM"},
45: { itag: 45, resolution: 720, format: "WebM"},
46: { itag: 46, resolution: 1080, format: "WebM"},
82: { itag: 82, resolution: 360, format: "MP4"},
83: { itag: 83, resolution: 240, format: "MP4"},
84: { itag: 84, resolution: 720, format: "MP4"},
85: { itag: 85, resolution: 520, format: "MP4"},
100:{ itag: 100, resolution: 360, format: "WebM"},
101:{ itag: 101, resolution: 480, format: "WebM"},
102:{ itag: 102, resolution: 720, format: "WebM"}
};
var videoList = new Array();
var encodedStream = ytplayer.config.args.url_encoded_fmt_stream_map;
var streamInfo = encodedStream.split(',');
for(i in streamInfo)
{
streamData = streamInfo[i].split('&');
var youtubeURL = '';
var youtubeSIG = '';
var youtubeITAG = 0;
for(y in streamData)
{
if(streamData[y].indexOf('itag=') == 0)
{
itagData = streamData[y].split('=');
youtubeITAG = itagData[1];
}
if(streamData[y].indexOf('url=') == 0)
{
urlData = streamData[y].split('=');
youtubeURL = unescape(urlData[1]);
}
if(streamData[y].indexOf('s=') == 0)
{
sigData = streamData[y].split('=');
youtubeSIG = unescape(sigData[1]);
}
}
if(youtubeURL != '' && youtubeITAG != 0)
{
if(youtubeURL.indexOf('signature') > 0)
{
var video = {formatObject: videoFormats[youtubeITAG], url: youtubeURL};
videoList.push(video);
}
else
{
var video = {formatObject: videoFormats[youtubeITAG], url: youtubeURL+'&signature='+youtubeRetrieveSignature(youtubeSIG)};
videoList.push(video);
}
}
}
return videoList;
}
catch(e){
var videoList = new Array();
console.log(e);
return videoList;
}
}
/**
* Purpose : Retrieve youtube video signature.
* @access : public
* @params : signature
* @return : decrypted signature;
*/
function youtubeRetrieveSignature(signature)
{
a = signature.split("");
decipherSignature.kR(a, 3);
decipherSignature.sI(a, 44);
decipherSignature.kR(a, 1);
decipherSignature.nV(a, 55);
decipherSignature.kR(a, 1);
decipherSignature.nV(a, 34);
decipherSignature.kR(a, 3);
decipherSignature.nV(a, 17);
decipherSignature.kR(a, 3);
return a.join("")
}
var decipherSignature = {
sI: function(a, b) {
var c = a[0];
a[0] = a[b % a.length];
a[b] = c
},
kR: function(a, b) {
a.splice(0, b)
},
nV: function(a) {
a.reverse()
}
};
/**
* Purpose : Protect multiple loading.
* @access : public
* @params : undefined
*/
function youtubeListener(){
var ext = document.getElementById('download-youtube-chrome-extension');
if(typeof ytplayer != 'undefined' && typeof ytplayer.config != 'undefined' && ytplayer.config != null && typeof ytplayer.config.args != 'undefined' &&
typeof ytplayer.config.args.url_encoded_fmt_stream_map != 'undefined' && ext == null){
youtubeAddBlock(youtubeGetVideoList());
}
}
if(window.history && history.pushState)
{
setInterval("youtubeListener()", 300);
}
else
{
youtubeAddBlock(youtubeGetVideoList());
} |