GM Last.fm Scrobbler for Bandcamp

Last.fm scrobbler for Bandcamp, based on GM Scrobbler for Pakartot.lt script
// ==UserScript==
// @name        GM Last.fm Scrobbler for Bandcamp
// @namespace   Rimantas Galvonas
// @description Last.fm scrobbler for Bandcamp, based on GM Scrobbler for Pakartot.lt script
// @include     *.bandcamp.com/*
// @require https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js
// @require https://cdnjs.cloudflare.com/ajax/libs/jquery-cookie/1.4.1/jquery.cookie.min.js
// @require https://greasyfork.org/scripts/130-portable-md5-function/code/Portable%20MD5%20Function.js?version=10066
// @version     1.17
// @grant       none
// ==/UserScript==
jQuery("#propOpenWrapper").append("<div id='scrobblerdiv' style='position:absolute; right:20px; top:20px; z-index:999'><div id='togglescrobbling' style='width:20px; height:20px; border-radius:10px; border: 1px solid black; background-color:rgb(43, 177, 43); line-height:20px; text-align:center;'></div></div>");


started = false;
playingflag = false;
scrobbledflag = false;
scrobblingenabled = '';
elapsed = 0;
startedplaying = '';
checkScrobblingCookie();

tick();

function getUrlParameter(sParam) {
    var sPageURL = window.location.search.substring(1);
    var sURLVariables = sPageURL.split('&');
    for (var i = 0; i < sURLVariables.length; i++) {
        var sParameterName = sURLVariables[i].split('=');
        if (sParameterName[0] == sParam) {
            return sParameterName[1];
        }
    }
}

function authentication() {

    if (!$.cookie('bandcampscrobblerlastfmkey') && !$.cookie('gettingsessionkey')) {
        $.cookie('gettingsessionkey', 'true');

        window.location.replace("http://www.last.fm/api/auth/?api_key=208364636e71f518eac93a4580f7ca29&cb=" + window.location.href);
    }

    if (!$.cookie('bandcampscrobblerlastfmkey') && $.cookie('gettingsessionkey')) {
        token = getUrlParameter('token');

        signing = hex_md5('api_key208364636e71f518eac93a4580f7ca29methodauth.getSessiontoken' + token + '995a6768f1c7d5d5a1242cc11c6ea8ce') + '';

        $.get("https://ws.audioscrobbler.com/2.0/?method=auth.getSession&token=" + token + "&api_key=208364636e71f518eac93a4580f7ca29&api_sig=" + signing, function(data) {
            $xml = $(data)
            key = $xml.find('key').text();
            $.cookie('bandcampscrobblerlastfmkey', key, {
                expires: 10000,
                path: '/',
                domain: '.bandcamp.com'
            });
            $.removeCookie('gettingsessionkey');
        });
    }
}

jQuery("#togglescrobbling").click(function() {
    if (scrobblingenabled == 1) {
        toggleScrobbling(0);
    } else {
        toggleScrobbling(1);
    }
});

jQuery(".jp-pause").click(function() {
    playingflag = false;
});


function startthething() {
    info = gettrackdata();

    console.log(info["artist"]);
    console.log(info["track"]);
    console.log(info["duration"]);
    updatenowplaying();
    startedplaying = Math.round(+new Date() / 1000);
}

function toggleScrobbling(bool) {
    if (bool == 1) {
        jQuery("#togglescrobbling").css('background-color', 'rgb(43, 177, 43)');
    } else {
        jQuery("#togglescrobbling").css('background-color', 'rgb(180, 180, 180)');
    }
    scrobblingenabled = bool;
    $.cookie('bandcampscrobblerenabled', bool, {
        expires: 10000,
        path: '/',
        domain: '.bandcamp.com'
    });
}

function checkScrobblingCookie() {
    if (!$.cookie('bandcampscrobblerenabled')) {
        $.cookie('bandcampscrobblerenabled', 1, {
            expires: 10000,
            path: '/',
            domain: '.bandcamp.com'
        });
        toggleScrobbling(1);
        return 1;
    } else {
        toggleScrobbling($.cookie('bandcampscrobblerenabled'));
        return $.cookie('bandcampscrobblerenabled');
    }
}

function gettrackdata() {
    track = jQuery('.track_info').find('span .title').text().trim();
    if (track.length < 1) {
        track = jQuery('h2.trackTitle').first().text().trim();
    }
    artist = jQuery('span[itemprop="byArtist"]').text().trim();
    if (artist == '') {
      artist = jQuery('#name-section h3 span:last-of-type a').text().trim()
    }
    duration = jQuery('.time_total').text();

    tt = duration.split(":");
    sec = tt[0] * 60 + tt[1] * 1;

    result = [];
    result["track"] = track;
    result["artist"] = artist;
    result["duration"] = sec;

    return result;
}

function updatenowplaying() {
    signing = hex_md5('api_key208364636e71f518eac93a4580f7ca29artist' + info["artist"] + 'methodtrack.updateNowPlayingsk' + $.cookie('bandcampscrobblerlastfmkey') + 'track' + info["track"] + '995a6768f1c7d5d5a1242cc11c6ea8ce') + '';

    $.ajax({
        type: 'POST',
        url: 'https://ws.audioscrobbler.com/2.0/',
        data: 'method=track.updateNowPlaying' +
            '&artist=' + info["artist"] +
            '&track=' + info["track"] +
            '&api_key=208364636e71f518eac93a4580f7ca29' +
            '&sk=' + $.cookie('bandcampscrobblerlastfmkey') +
            '&api_sig=' + signing,
        success: function(data) {
            //console.log("Now playing updated.");
        },
        error: function(code, message) {
            console.log("Now playing update failed.");
            //console.log(code);
            xmlDoc = jQuery.parseXML(code['responseText']);
            $xml = $(xmlDoc);
            errorcode = $xml.find('error').attr('code');
            console.log(errorcode);

            if (errorcode == 9) {
                $.removeCookie('bandcampscrobblerlastfmkey', {
                    path: '/',
                    domain: '.bandcamp.com'
                });
                authentication();
            }
        }
    });
}


function scrobble() {
    signing = hex_md5('api_key208364636e71f518eac93a4580f7ca29artist' + info["artist"] + 'methodtrack.scrobblesk' + $.cookie('bandcampscrobblerlastfmkey') + 'timestamp' + startedplaying + 'track' + info["track"] + '995a6768f1c7d5d5a1242cc11c6ea8ce') + '';

    $.ajax({
        type: 'POST',
        url: 'https://ws.audioscrobbler.com/2.0/',
        data: 'method=track.scrobble' +
            '&artist=' + info["artist"] +
            '&track=' + info["track"] +
            '&timestamp=' + startedplaying +
            '&api_key=208364636e71f518eac93a4580f7ca29' +
            '&sk=' + $.cookie('bandcampscrobblerlastfmkey') +
            '&api_sig=' + signing,
        success: function(data) {
            console.log("Scrobbled.");
            jQuery('#togglescrobbling').html('&#10004;').attr('title', 'Scrobbled');
        },
        error: function(code, message) {
            console.log("Scrobbling failed.");
            jQuery('#togglescrobbling').html('&#10007;').attr('title', 'Scrobbling failed');
        }
    });
}

function tick() {
    window.setInterval(function() {
        if (started == false && jQuery('.playbutton').hasClass('playing')) {
            startthething();
            started = true;
        }

        if (jQuery('.playbutton').hasClass('playing')) {
            playingflag = true;
        } else {
            playingflag = false;
        }

        if (playingflag == true) {
            elapsed++;
        }

        if (info["duration"] > 30 && (elapsed > (info['duration'] / 2) || elapsed > 240) && scrobbledflag == false && scrobblingenabled == 1) {
            scrobble();
            scrobbledflag = true;
        }

        info_last = gettrackdata();

        if (info_last["track"] != info["track"] || info_last["artist"] != info["artist"] || info_last["duration"] != info["duration"]) {
            info = info_last;
            scrobbledflag = false;
            jQuery('#togglescrobbling').html('').removeAttr('title');
            elapsed = 0;
            updatenowplaying();
            startedplaying = Math.round(+new Date() / 1000);
        }
    }, 1000);
}