duomidown.user.js

// ==UserScript==
// @name          Duomi Download
// @namespace     http://diveintogreasemonkey.org/download/
// @description   Easy to download duomi music
// @include       http://huodong.duomi.com/*
// ==/UserScript==

var unsafeWindow = (function () {
    var dummyElem = document.createElement('p');
    dummyElem.setAttribute('onclick', 'return window;');
    return dummyElem.onclick();
}) ();

var Base64 = {
    // private property
    _keyStr : "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=",
    
    // public method for encoding
    encode : function (input) {
        var output = "";
        var chr1, chr2, chr3, enc1, enc2, enc3, enc4;
        var i = 0;
    
        input = Base64._utf8_encode(input);
    
        while (i < input.length) {
    
            chr1 = input.charCodeAt(i++);
            chr2 = input.charCodeAt(i++);
            chr3 = input.charCodeAt(i++);
    
            enc1 = chr1 >> 2;
            enc2 = ((chr1 & 3) << 4) | (chr2 >> 4);
            enc3 = ((chr2 & 15) << 2) | (chr3 >> 6);
            enc4 = chr3 & 63;
    
            if (isNaN(chr2)) {
                enc3 = enc4 = 64;
            } else if (isNaN(chr3)) {
                enc4 = 64;
            }
    
            output = output +
            this._keyStr.charAt(enc1) + this._keyStr.charAt(enc2) +
            this._keyStr.charAt(enc3) + this._keyStr.charAt(enc4);
    
        }
    
        return output;
    },
    
    // public method for decoding
    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 = this._keyStr.indexOf(input.charAt(i++));
            enc2 = this._keyStr.indexOf(input.charAt(i++));
            enc3 = this._keyStr.indexOf(input.charAt(i++));
            enc4 = this._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 = Base64._utf8_decode(output);
    
        return output;
    
    },
    
    // private method for UTF-8 encoding
    _utf8_encode : function (string) {
        string = string.replace(/\r\n/g,"\n");
        var utftext = "";
    
        for (var n = 0; n < string.length; n++) {
    
            var c = string.charCodeAt(n);
    
            if (c < 128) {
                utftext += String.fromCharCode(c);
            }
            else if((c > 127) && (c < 2048)) {
                utftext += String.fromCharCode((c >> 6) | 192);
                utftext += String.fromCharCode((c & 63) | 128);
            }
            else {
                utftext += String.fromCharCode((c >> 12) | 224);
                utftext += String.fromCharCode(((c >> 6) & 63) | 128);
                utftext += String.fromCharCode((c & 63) | 128);
            }
    
        }
    
        return utftext;
    },
    
    // 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;
    }

}

// get download url
var url = unsafeWindow.downmusic.toString().match(/http.*?mp3/)[0];
var xunleiUrl = "thunder://" + Base64.encode("AA" + url + "ZZ");

// create download link
var linkTextXunlei = document.createTextNode("迅雷下载 ");
var linkTextNormal = document.createTextNode("普通下载 ");
var linkXunlei = document.createElement("a");
var linkNormal = document.createElement("a");
linkXunlei.setAttribute("href", xunleiUrl);
linkNormal.setAttribute("href", url);
linkXunlei.appendChild(linkTextXunlei);
linkNormal.appendChild(linkTextNormal);

// insert download link and remove help link
var downsong = document.getElementsByClassName("downsong")[0];
var helplink = downsong.getElementsByTagName("a")[1];
downsong.removeChild(helplink);
downsong.appendChild(linkXunlei);
downsong.appendChild(linkNormal);