logger.js

module.exports = function logger(options) {

    var stream = options.stream || process.stdout;

    return function logger(req, res, next) {
        if (/^\/despatch(?:\w*)/i.test(req.url)) {
            var ua = req.headers['user-agent'],
                browser = {
                    opera: /opera/i.test(ua),
                    msie: (/msie/i.test(ua) && !/opera/i.test(ua)),
                    msie6: (/msie 6/i.test(ua) && !/opera/i.test(ua)),
                    msie7: (/msie 7/i.test(ua) && !/opera/i.test(ua)),
                    msie8: (/msie 8/i.test(ua) && !/opera/i.test(ua)),
                    msie9: (/msie 9/i.test(ua) && !/opera/i.test(ua)),
                    mozilla: /firefox/i.test(ua),
                    chrome: /chrome/i.test(ua),
                    safari: (!(/chrome/i.test(ua)) && /webkit|safari|khtml/i.test(ua)),
                    webkit: /webkit/i.test(ua),
                    iphone: /iphone/i.test(ua),
                    ipod: /ipod/i.test(ua),
                    iphone4: /iphone.*OS 4/i.test(ua),
                    ipod4: /ipod.*OS 4/i.test(ua),
                    ipad: /ipad/i.test(ua),
                    android: /android/i.test(ua),
                    bada: /bada/i.test(ua),
                    mobile: /iphone|ipod|ipad|opera mini|opera mobi|iemobile|android/i.test(ua),
                    msie_mobile: /iemobile/i.test(ua),
                    safari_mobile: /iphone|ipod|ipad/i.test(ua),
                    opera_mobile: /opera mini|opera mobi/i.test(ua),
                    opera_mini: /opera mini/i.test(ua),
                    mac: /mac/i.test(ua),
                    version: (ua.match( /.+(?:me|ox|on|rv|it|era|ie)[\/: ]([\d.]+)/ ) || [0,'0'])[1]
                },
                Ua=[],b=browser,k;for(var k in b){b[k] && Ua.push('version'==k?b[k]:k)};Ua=Ua.join('|');

            var urlRequest = require("url").parse(req.url, true);
            var query = urlRequest.query,
                line = JSON.stringify(query) + ' - ' + Ua;

            console.log(line);
            stream.write(line + '\n');

            res.setHeader("Content-Type", "image/gif");
            res.setHeader("Content-Lenght", "0");
            res.setHeader("Access-Control-Allow-Origin", "*");
            res.end();

        } else {
            next();
        }
    };
};