// ==UserScript==
// @name        VKget music
// @version     1.0
// @description Скрипт добавляет ссылки для скачивания к аудиозаписям на vk.com. Если ссылки не появились автоматически, нажмите F9. Для сохранения всех файлов через wget нажмите F2.
// This script adds download links to audios at vk.com. If links did not appear automatically press F9. To save all files via wget, press F2.
// @match       *://vk.com/*
// @require     http://ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js
// @grant       none
// @run-at      document-idle
// 12.08.2017
// @namespace https://greasyfork.org/users/148414
// @downloadURL none
// ==/UserScript==


(function() {

    function extra(t) {
        if (~t.indexOf("audio_api_unavailable")) {
            var i = t.split("?extra=")[1].split("#")
              , e = o(i[1]);
            if (i = o(i[0]),
            !e || !i)
                return t;
            e = e.split(String.fromCharCode(9));
            for (var a, r, l = e.length; l--; ) {
                if (r = e[l].split(String.fromCharCode(11)),
                a = r.splice(0, 1, i)[0],
                !s[a])
                    return t;
                i = s[a].apply(null, r)
            }
            if (i && "http" === i.substr(0, 4))
                return i
        }
        return t
    }
    function o(t) {
        if (!t || t.length % 4 == 1)
            return !1;
        for (var i, e, o = 0, s = 0, r = ""; e = t.charAt(s++); )
            e = a.indexOf(e),
            ~e && (i = o % 4 ? 64 * i + e : e,
            o++ % 4) && (r += String.fromCharCode(255 & i >> (-2 * o & 6)));
        return r
    }
    var a = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMN0PQRSTUVWXYZO123456789+/="
      , s = {
        v: function(t) {
            return t.split("").reverse().join("")
        },
        r: function(t, i) {
            t = t.split("");
            for (var e, o = a + a, s = t.length; s--; )
                e = o.indexOf(t[s]),
                ~e && (t[s] = o.substr(e - i, 1));
            return t.join("")
        },
        x: function(t, i) {
            var e = [];
            return i = i.charCodeAt(0),
            t.split("").forEach(function(o) {
                e.push(String.fromCharCode(o.charCodeAt(0) ^ i))
            }),
            e.join("")
        }
    }

   function download(strData, strFileName, strMimeType) {
        var D = document,
            A = arguments,
            a = D.createElement("a"),
            d = A[0],
            n = A[1],
            t = A[2] || "text/plain";

        a.href = "data:" + strMimeType + "charset=utf-8," + strData;

        if (window.MSBlobBuilder) { // IE10
            var bb = new MSBlobBuilder();
            bb.append(strData);
            return navigator.msSaveBlob(bb, strFileName);
        }

        if ('download' in a) { //FF20, CH19
            a.setAttribute("download", n);
            a.innerHTML = "downloading...";
            D.body.appendChild(a);
            setTimeout(function() {
                var e = D.createEvent("MouseEvents");
                e.initMouseEvent("click", true, false, window, 0, 0, 0, 0, 0, false, false, false, false, 0, null);
                a.dispatchEvent(e);
                D.body.removeChild(a);
            }, 66);
            return true;
        };
    }


    var ready = 0;
    var wget_list = "";
    var run = 0;

    function add_download_links() {
        var audio_row_selector = '.audio_row';
        var link_style = 'position: absolute; right: -16px; top: 17px; color: white; z-index: 100; background: red; border-radius: 3px 0 0 3px; padding: 0px 2px; font-size: 16px; opacity: 0.5;';
        run = 1;

        if ($(audio_row_selector).length <= ready) {
            run = 0;
            return;
        }

        var $this = $($(audio_row_selector)[ready]);

        var song_name = $this.find('.audio_row__title_inner').text().trim().replace(/\"/g, '\'');
        var performer_name = $this.find('.audio_row__performer').text().trim().replace(/\"/g, '\'');
        var track_name = performer_name + ' - ' + song_name;

        var audio_id_raw = $this.data('audio');
        var audio_id = audio_id_raw[1] + '_' + audio_id_raw[0];

        var link = "";

        $.ajax({
            url: 'https://vk.com/al_audio.php',
            method: 'post',
            async: false,
            data: {
                act: 'reload_audio',
                al: 1,
                ids: audio_id
            },
            success: function(response) {
                var matches = response.match(/(https:\\\/\\\/.+\.mp3)/);
                if (matches) {
                    s_response = response.split('"');
                    link = extra(s_response[1]);
                    if (link != s_response[1]) {
                        $this.append('<a class="audio-download-link" style="' + link_style +
                            '" title="Скачать" download="' +
                            track_name + '.mp3" data-track_name="' +
                            track_name + '" href="' + link +
                            '" onclick="arguments[0].stopPropagation()">&#9835;</a>'
                        );
                        ready++;
                        wget_list += 'wget -c -O "' + track_name + '.mp3" ' + link + escape('\n');
                    }
                }
            }
        });

        setTimeout( function(){ add_download_links() }, 500);
    }


    add_download_links();
    if (!ready)
        setTimeout( function(){ add_download_links() }, 2000);

    $('body').keydown(function(e){
        if (!run && e.which == 120) { // F9
            add_download_links();
        }
        if (e.which == 113) { // F2
            download(wget_list, 'wget.sh', 'text/plain');
        }
    });
})();