UUID JavaScript library; based on the current timestamp, the user's browser, the current URL and a random number

uuid.js

goog.provide('uuid');


var uuid = function () {
	var parts = new Array(4);

	// a - unix timestamp
	var time = Math.round(new Date().getTime() / 1000);
	parts[0] = time.toString(16).substring(0, 8);

	// b - browser
	var ua_string = window.navigator.userAgent;
	var match = ua_string.match(/\d+/g);
	if (!match) {
		throw 'Invalid browser version string';
	}
	var sum = 0;
	for (var i = 0, ii = match.length; i < ii; ++i) {
		sum += parseInt(match[i], 10);
	}
	parts[1] = (sum * sum * sum).toString(16).substring(0, 6);

	// c - url
	var href = window.location.href;
	parts[2] = (href.length * href.length * href.length).toString(16).substring(0, 4);

	// d - random
	parts[3] = Math.random().toString().substring(2);
	parts[3] = parseInt(parts[3], 10).toString(16).substring(0, 6);

	return parts.join('');
};