jquery.browser-fingerprint-1.1.js | |
|---|---|
| Browser fingerprinting is a technique to "mark" anonymous users using JS 2 | (or other things). To build an "identity" of sorts the browser is queried 3 | for a list of its plugins, the screen size and several other things, then 4 | hashes them. The idea is that these bits of information produce an unique 5 | "fingerprint" of sorts; the more elaborate the list of data points is, the 6 | more unique this fingerprint becomes. And you wouldn't even need to set a 7 | cookie to recognize this user when she visits again. 8 | 9 |For more information on this topic consult 10 | Ars Technica 11 | or the EFF. There is a lot of potential 12 | for undesirable shenanigans, and I strictly oppose using this technique for 13 | marketing and ad-related tracking purposes. 14 | 15 |Anyways, I needed a really simple fingerprinting library, so I wrote a 16 | quick and dirty jQuery plugin. This is by no means a complete and 17 | watertight implementation -- it is merely the scratch for a particular itch 18 | I was having. YMMV. 19 | 20 |This library was written by Carlo Zottmann, carlo@municode.de, has its home 21 | on Github and is 22 | WTF-licensed (see LICENSE.txt). | ( function($) { |
| Calling | $.fingerprint = function() { |
| This function,
| function _raw() { |
| That string is the return value. | return [
36 | navigator.userAgent,
37 | [ screen.height, screen.width, screen.colorDepth ].join("x"),
38 | ( new Date() ).getTimezoneOffset(),
39 | !!window.sessionStorage,
40 | !!window.localStorage,
41 | $.map( navigator.plugins, function(p) {
42 | return [
43 | p.name,
44 | p.description,
45 | $.map( p, function(mt) {
46 | return [ mt.type, mt.suffixes ].join("~");
47 | }).join(",")
48 | ].join("::");
49 | }).join(";")
50 | ].join("###");
51 | } |
|
| function _md5() {
52 | if ( typeof window.md5 === "function" ) { |
| The return value is the hashed fingerprint string. | return md5( _raw() );
53 | }
54 | else { |
| If | throw "md5 unavailable, please get it from http://github.com/wbond/md5-js/";
55 | }
56 | } |
| And, since I'm lazy, calling | return _md5();
58 | }
59 |
60 | })(jQuery);
61 |
62 | |