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/var/www/vhosts/3dshawn.com/ptmatrix.3dshawn.com/assets/js/fingerprint.js

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	1	// fingerprint.js -- lightweight passive browser fingerprint.
	2	//
	3	// Computes a stable-per-browser SHA-256 hash from:
	4	// canvas rendering, WebGL renderer/vendor, screen dims, timezone,
	5	// language, platform, available fonts (probed via canvas measure),
	6	// hardware concurrency, deviceMemory, and touch capability.
	7	//
	8	// Injects the resulting 64-char hex hash into a hidden input named
	9	// `fp_hash` inside the first login/signup form on the page, so a normal
	10	// form POST carries it through without any XHR.
	11	//
	12	// Absolutely no personally-identifying info. This is a device signature
	13	// used for the blocklist -- when an admin blocks a fingerprint, that
	14	// hash is compared against the signup/login attempt's hash.
	15	(function () {
	16	'use strict';
	17	if (!window.crypto \|\| !window.crypto.subtle) return; // very old browsers -- skip silently
	18	if (document.querySelector('form input[name="fp_hash"]')) return; // already injected
	19
	20	function safe(fn) { try { return fn(); } catch (e) { return ''; } }
	21
	22	function canvasHash() {
	23	return safe(function () {
	24	var c = document.createElement('canvas');
	25	c.width = 220; c.height = 40;
	26	var ctx = c.getContext('2d');
	27	if (!ctx) return '';
	28	ctx.textBaseline = 'top';
	29	ctx.font = "14px 'Arial'";
	30	ctx.fillStyle = '#f60';
	31	ctx.fillRect(0, 0, 200, 20);
	32	ctx.fillStyle = '#069';
	33	ctx.fillText('Cwm fjord bank glyphs vext quiz. \u{1F4A1}', 2, 15);
	34	ctx.strokeStyle = 'rgba(102,204,0,0.7)';
	35	ctx.beginPath();
	36	ctx.arc(30, 20, 12, 0, Math.PI * 2, true);
	37	ctx.stroke();
	38	return c.toDataURL();
	39	});
	40	}
	41
	42	function webglHash() {
	43	return safe(function () {
	44	var c = document.createElement('canvas');
	45	var gl = c.getContext('webgl') \|\| c.getContext('experimental-webgl');
	46	if (!gl) return '';
	47	var dbg = gl.getExtension('WEBGL_debug_renderer_info');
	48	var vendor = dbg ? gl.getParameter(dbg.UNMASKED_VENDOR_WEBGL) : '';
	49	var render = dbg ? gl.getParameter(dbg.UNMASKED_RENDERER_WEBGL) : '';
	50	return vendor + '\|\|' + render + '\|\|' + gl.getParameter(gl.VERSION);
	51	});
	52	}
	53
	54	function fontProbe() {
	55	// Detect installed fonts by measuring baseline widths and comparing
	56	// to a fallback. Not exhaustive -- just enough to add entropy.
	57	return safe(function () {
	58	var baseFonts = ['monospace', 'sans-serif', 'serif'];
	59	var testFonts = ['Arial','Courier New','Georgia','Helvetica','Impact','Tahoma','Times New Roman','Verdana','Trebuchet MS','Comic Sans MS'];
	60	var span = document.createElement('span');
	61	span.style.cssText = 'position:absolute;left:-9999px;top:-9999px;font-size:72px';
	62	span.textContent = 'mmmmmmmmmmlli';
	63	document.body.appendChild(span);
	64	var widths = {};
	65	baseFonts.forEach(function (bf) {
	66	span.style.fontFamily = bf;
	67	widths[bf] = { w: span.offsetWidth, h: span.offsetHeight };
	68	});
	69	var detected = testFonts.filter(function (tf) {
	70	return baseFonts.some(function (bf) {
	71	span.style.fontFamily = tf + ',' + bf;
	72	return span.offsetWidth !== widths[bf].w \|\| span.offsetHeight !== widths[bf].h;
	73	});
	74	});
	75	document.body.removeChild(span);
	76	return detected.join(',');
	77	});
	78	}
	79
	80	function hexDigest(buf) {
	81	var arr = new Uint8Array(buf);
	82	var hex = '';
	83	for (var i = 0; i < arr.length; i++) {
	84	var h = arr[i].toString(16);
	85	hex += (h.length < 2 ? '0' + h : h);
	86	}
	87	return hex;
	88	}
	89
	90	function compute() {
	91	var parts = [
	92	'v1',
	93	canvasHash(),
	94	webglHash(),
	95	fontProbe(),
	96	navigator.userAgent \|\| '',
	97	navigator.language \|\| '',
	98	navigator.platform \|\| '',
	99	(navigator.hardwareConcurrency \|\| 0) + '',
	100	(navigator.deviceMemory \|\| 0) + '',
	101	('ontouchstart' in window) + '',
	102	(screen.width \|\| 0) + 'x' + (screen.height \|\| 0),
	103	(screen.colorDepth \|\| 0) + '',
	104	(window.devicePixelRatio \|\| 0) + '',
	105	safe(function () { return Intl.DateTimeFormat().resolvedOptions().timeZone; }) \|\| '',
	106	(new Date().getTimezoneOffset()) + ''
	107	];
	108	var input = parts.join('\|\|');
	109	var enc = new TextEncoder().encode(input);
	110	return window.crypto.subtle.digest('SHA-256', enc).then(hexDigest);
	111	}
	112
	113	function injectInto(form, hash) {
	114	if (!form) return;
	115	if (form.querySelector('input[name="fp_hash"]')) return;
	116	var hidden = document.createElement('input');
	117	hidden.type = 'hidden';
	118	hidden.name = 'fp_hash';
	119	hidden.value = hash;
	120	form.appendChild(hidden);
	121	}
	122
	123	function run() {
	124	compute().then(function (hash) {
	125	// Attach to every form -- login, signup, and any others on the page.
	126	document.querySelectorAll('form').forEach(function (f) { injectInto(f, hash); });
	127	}).catch(function () { /* silent -- fingerprint is best-effort */ });
	128	}
	129
	130	if (document.readyState === 'loading') {
	131	document.addEventListener('DOMContentLoaded', run);
	132	} else {
	133	run();
	134	}
	135	})();