nfc-web/web/nfc-theme/static/geo.js

// reformat geo: links based on platform
const ua = String(platform.os).toLowerCase();
const android = ua.indexOf("android") > -1;
const ios = ua.indexOf("ios") > -1;
const windows = ua.indexOf("windows") > -1;
const linux = ua.indexOf("linux") > -1;
const mac = ua.indexOf("macos") > -1;
var hashlinks = document.querySelectorAll('[href*="geo:"]');
var hasharray = [...hashlinks];
if ( hasharray.length > 0 ) {
    hasharray.forEach(hashlink => {
        const geolink = hashlink.getAttribute("href").match(/(-?\d+(\.\d+)?),\s*(-?\d+(\.\d+)?)/g);
        var latlon;
        if ( geolink.length > 1 && geolink[0] == '0,0') latlon = geolink[1];
        else latlon = geolink[0];
        if ( windows || mac || linux ) hashlink.href = "https://maps.google.com/?q=" + latlon;
        else if ( android ) hashlink.href = "geo:0,0?q=" + latlon;
        else if ( ios ) hashlink.href = "http://maps.apple.com/?ll=" + latlon + "&q=" + hashlink.innerHTML;
    });
}

// fingerprint user

function cyrb53(str, seed = 0){
    let h1 = 0xdeadbeef ^ seed, h2 = 0x41c6ce57 ^ seed;
    for (let i = 0, ch; i < str.length; i++) {
        ch = str.charCodeAt(i);
        h1 = Math.imul(h1 ^ ch, 2654435761);
        h2 = Math.imul(h2 ^ ch, 1597334677);
    }
    h1 = Math.imul(h1 ^ (h1 >>> 16), 2246822507) ^ Math.imul(h2 ^ (h2 >>> 13), 3266489909);
    h2 = Math.imul(h2 ^ (h2 >>> 16), 2246822507) ^ Math.imul(h1 ^ (h1 >>> 13), 3266489909);
    return 4294967296 * (2097151 & h2) + (h1 >>> 0);
};

function audioFingerprint() {
    const AudioContext = window.OfflineAudioContext || window.webkitOfflineAudioContex;
    const context = new AudioContext(1, 5000, 44100);
    const oscillator = context.createOscillator();
    oscillator.type = "triangle";
    oscillator.frequency.value = 1000;
    const compressor = context.createDynamicsCompressor()
    compressor.threshold.value = -50;
    compressor.knee.value = 40;
    compressor.ratio.value = 12;
    compressor.reduction.value = 20;
    compressor.attack.value = 0;
    compressor.release.value = 0.2;
    oscillator.connect(compressor);
    compressor.connect(context.destination);
    oscillator.start()
    context.oncomplete = event => {
        const samples = event.renderedBuffer.getChannelData(0);
        let hash = 0;
        for (let i = 0; i < samples.length; ++i) {
            hash += Math.abs(samples[i]);
        }
        return hash;
    };
    context.startRendering();
}

function canvasFingerprint() {
    var canvas = document.createElement('canvas');
    var ctx = canvas.getContext('2d');
    var txt = 'Numinous Field Communication';
    ctx.textBaseline = "top";
    ctx.font = "14px 'Arial'";
    ctx.textBaseline = "alphabetic";
    ctx.fillStyle = "#f60";
    ctx.fillRect(125, 1, 62, 20);
    ctx.fillStyle = "#069";
    ctx.fillText(txt, 2, 15);
    ctx.fillStyle = "rgba(102, 204, 0, 0.7)";
    ctx.fillText(txt, 4, 17);
    src = canvas.toDataURL();
    var hash;
    for (i = 0; i < src.length; i++) {
        char = src.charCodeAt(i);
        hash = ((hash<<5)-hash)+char;
        hash = hash & hash;
    }
    return hash;
};

function getFingerprint() {
    const audioFp = audioFingerprint();
    const canvasFp = canvasFingerprint();
    const hash = cyrb53(audioFp + canvasFp);
    return hash;
};

fetch('https://nmns.place/track?' + new URLSearchParams({
    hash: getFingerprint(),
    ua: ua,
}));