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playlist.js
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playlist.js
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var xhr = require("./XMLHTTPRequest.js");
var querystring = require("querystring");
/* RC4 symmetric cipher encryption/decryption
* Copyright (c) 2006 by Ali Farhadi.
* released under the terms of the Gnu Public License.
* see the GPL for details.
*
* Email: ali[at]farhadi[dot]ir
* Website: http://farhadi.ir/
*/
/**
* Encrypt given plain text using the key with RC4 algorithm.
* All parameters and return value are in binary format.
*
* @param string key - secret key for encryption
* @param string pt - plain text to be encrypted
* @return string
*/
function rc4Encrypt(key, pt) {
s = new Array();
for (var i=0; i<256; i++) {
s[i] = i;
}
var j = 0;
var x;
for (i=0; i<256; i++) {
j = (j + s[i] + key.charCodeAt(i % key.length)) % 256;
x = s[i];
s[i] = s[j];
s[j] = x;
}
i = 0;
j = 0;
var ct = '';
for (var y=0; y<pt.length; y++) {
i = (i + 1) % 256;
j = (j + s[i]) % 256;
x = s[i];
s[i] = s[j];
s[j] = x;
ct += String.fromCharCode(pt.charCodeAt(y) ^ s[(s[i] + s[j]) % 256]);
}
return ct;
}
/**
* Decrypt given cipher text using the key with RC4 algorithm.
* All parameters and return value are in binary format.
*
* @param string key - secret key for decryption
* @param string ct - cipher text to be decrypted
* @return string
*/
function rc4Decrypt(key, ct) {
return rc4Encrypt(key, ct);
}
function strToChars(str){
var loc1=new Array();
var loc2=0;
while(loc2<str.length){
loc1.push(str.charCodeAt(loc2));
loc2=loc2+1;
}
return loc1;
}
function hexToChars(str){
var arr=new Array();
var loc2=str.substr(0,2)!="0x" ? 0 : 2;
while(loc2<str.length){
arr.push(parseInt(str.substr(loc2,2),16));
loc2=loc2+2;
}
return arr;
}
var rc4Key="sdf883jsdf22";
function decrypt(key,url){
return rc4Decrypt(rc4Key,hexToChars(url).map(function(s){return String.fromCharCode(s);}).join(""))
}
var playlist = {
rc4Key:"sdf883jsdf22",
url: "http://www.playlist.com/async/searchbeta/tracks?searchfor=%s&page=%page",
search: function(txt, callback){
var url = this.url.replace("%s",querystring.escape(txt));
url = url.replace("%page",0);
console.log("url: "+url);
var req=new xhr.XMLHttpRequest();
req.open('GET',url,true);
var pl = this;
req.onreadystatechange=function(){
if (req.readyState==4&&req.status==200){
var txt=req.responseText;
var tracksText = txt.match(/PPL.search.trackdata = (.+);/m)[1];
var tracks = JSON.parse(tracksText);
for (var i in tracks){
var track = tracks[i];
var songurl=track.song_url;
console.log("artist: "+track.artist);
console.log("title: "+track.title);
console.log("album: "+track.album);
//console.log("url: "+songurl);
var uri=decrypt(pl.rc4Key,songurl);
//var uri = rc4(pl.rc4Key,songurl);
console.log("uri: "+uri);
var song = {
title: track.title,
artist: track.artist,
album: track.album,
url: uri
};
callback.apply(pl, [song]);
return;
}
if (tracks.length==0){
callback.apply(pl, [null]);
}
} else if (req.readyState==4){
console.log("req: "+req.responseText);
}
//console.log(req.responseText);
}
req.send(null);
},
getMP3: function(search, callback){
var pl = this;
this.search(search, function(song){
if (song)
callback.apply(pl, [song.url]);
else
callback.apply(pl, [null]);
});
}
}
exports.playlist = playlist;