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// ==UserScript==
// @name 5sing Assist
// @namespace http://example.com
// @description 修改 5sing 歌曲页面下载按钮链接为真实歌曲链接。
// @include http://5sing.kugou.com/yc/*
// @include http://5sing.kugou.com/fc/*
// @include http://5sing.kugou.com/bz/*
// @run-at document-end
// @grant none
// @author xiofee
// @version 0.2
// @copyright 2014-2016,xiofee
// @downloadURL https://update.greasyfork.icu/scripts/7067/5sing%20Assist.user.js
// @updateURL https://update.greasyfork.icu/scripts/7067/5sing%20Assist.meta.js
// ==/UserScript==
/* History
* 2014-12-18 v0.1 首个版本 | The first version.
* 2016-06-06 v0.2 依然可用，只是改个版本号，刷个存在感。 | Still available, only changed version number.
*/
/**
*
* Base64 encode / decode
*
* @author haitao.tu
* @date 2010-04-26
* @email tuhaitao@foxmail.com
*
*/
(function() {
function Base64() {
// private property
_keyStr = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=';
// public method for decoding
this.decode = function (input) {
var output = '';
var chr1,
chr2,
chr3;
var enc1,
enc2,
enc3,
enc4;
var i = 0;
input = input.replace(/[^A-Za-z0-9\+\/\=]/g, '');
while (i < input.length) {
enc1 = _keyStr.indexOf(input.charAt(i++));
enc2 = _keyStr.indexOf(input.charAt(i++));
enc3 = _keyStr.indexOf(input.charAt(i++));
enc4 = _keyStr.indexOf(input.charAt(i++));
chr1 = (enc1 << 2) | (enc2 >> 4);
chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);
chr3 = ((enc3 & 3) << 6) | enc4;
output = output + String.fromCharCode(chr1);
if (enc3 != 64) {
output = output + String.fromCharCode(chr2);
}
if (enc4 != 64) {
output = output + String.fromCharCode(chr3);
}
}
output = _utf8_decode(output);
return output;
}
// private method for UTF-8 decoding
_utf8_decode = function (utftext) {
var string = '';
var i = 0;
var c = c1 = c2 = 0;
while (i < utftext.length) {
c = utftext.charCodeAt(i);
if (c < 128) {
string += String.fromCharCode(c);
i++;
} else if ((c > 191) && (c < 224)) {
c2 = utftext.charCodeAt(i + 1);
string += String.fromCharCode(((c & 31) << 6) | (c2 & 63));
i += 2;
} else {
c2 = utftext.charCodeAt(i + 1);
c3 = utftext.charCodeAt(i + 2);
string += String.fromCharCode(((c & 15) << 12) | ((c2 & 63) << 6) | (c3 & 63));
i += 3;
}
}
return string;
}
};
function isListenPage() {
var _isListen = false;
// Listen mode page not use pageOptions.
if ('undefined' == typeof pageOptions) {
_isListen = true;
}
return _isListen;
}
function getEncryptSongInfo() {
var _info;
if (isListenPage()) {
// Listen mode page
_info = globals.ticket;
} else {
// Normal mode page
_info = pageOptions.ticket;
}
var _base64 = new Base64();
var _songObj = eval('(' + _base64.decode(_info) + ')');
return _songObj;
}
function getRealSongUrl() {
var _songInfo = getEncryptSongInfo();
return _songInfo.file;
}
function getDownloadButton() {
var _downBtn;
if (isListenPage()) {
_downBtn = document.getElementById('func_Down');
} else {
_downBtn = document.getElementsByClassName('func_icon3') [0];
_downBtn = _downBtn.getElementsByTagName('a') [0];
}
return _downBtn;
}
var downBtn = getDownloadButton();
downBtn.href = getRealSongUrl();
})();