its-meta-theme-light/common/body_tag.html

<script async>
// GNU-GPL-3.0-or-later

var its =  (function() {
    if(!$ || !$.ajax || !WebSocket) {
        console.log('')
        return;
    }

    ////////////////////////////////////////////////////////////////////////////

    const logos_small = {
        'open': 'https://git.it-syndikat.org/IT-Syndikat/its-logo-ci-designs/raw/branch/master/Logo2013/meta/light/logo2013_green.svg',
        'closed': 'https://git.it-syndikat.org/IT-Syndikat/its-logo-ci-designs/raw/branch/master/Logo2013/meta/light/logo2013_red.svg', 
        'error': 'https://git.it-syndikat.org/IT-Syndikat/its-logo-ci-designs/raw/branch/master/Logo2013/meta/light/logo2013_yellow.svg'
    }

    const logos_big = {
        'open': 'https://git.it-syndikat.org/IT-Syndikat/its-logo-ci-designs/raw/branch/master/Logo2013/meta/light/logo2013_name_green.svg',
        'closed': 'https://git.it-syndikat.org/IT-Syndikat/its-logo-ci-designs/raw/branch/master/Logo2013/meta/light/logo2013_name_red.svg', 
        'error': 'https://git.it-syndikat.org/IT-Syndikat/its-logo-ci-designs/raw/branch/master/Logo2013/meta/light/logo2013_name_yellow.svg'
    };

    ////////////////////////////////////////////////////////////////////////////

    var url = new URL(new URL(location.href).origin);
    url.protocol = url.protocol == 'https:' ? 'wss' : 'ws';
    url += 'its-open-ws/';


    var reconnect_delay = 1000;
    var reconnect_giveup = 1000000;

    function connect() {
        if(reconnect_delay > reconnect_giveup)
            return;

        setTimeout(function() {
            console.log('isitopen: reconnecting');
            var ws = new WebSocket(url);
            register(ws);

        }, reconnect_delay);

        reconnect_delay *= 2;
    }

    function refresh() {
        $.get('https://spaceapi.it-syndikat.org/api/status-s.php')
            .then(function(isitopen) {
                var state;

                if(isitopen === 'true')
                    state = 'open';
                else if(isitopen === 'false')
                    state = 'closed';
                else
                    state = 'error';

                console.log('isitopen: it is', state);
                update_dom(state);
            }, function() {
                console.log('isitopen: it is', 'error');
                update_dom('error');
            });
    }

    function update_dom(state) {
        setTimeout(function() {
            console.log('update_dom', state);

            if($('.logo-big').length > 0) {
                $('.logo-big').bind('DOMNodeRemoved', function(){ update_dom(state) });
                $('.logo-big').attr('src', logos_big[state]).css('display', 'block');
            } else if($('.logo-mobile').length > 0) {
                $('.logo-mobile').bind('DOMNodeRemoved', function(){ update_dom(state) });
                $('.logo-mobile').attr('src', logos_big[state]).css('display', 'block');
            } else if($('.logo-small').length > 0) {
                $('.logo-small').bind('DOMNodeRemoved', function(){ update_dom(state) });
                $('.logo-small').attr('src', logos_small[state]).css('display', 'block');
            }
        })
    }

    function register(ws) {
        ws.onclose   = function() { connect(); };
        ws.onmessage = function(event) { refresh(); };
    }

    refresh();
    connect();

    return {
        'update_dom': update_dom,
        'refresh': refresh
    };
})();
</script>