logger.js

"use strict";

var winston = require('winston');
var express = require("express");
var ua      = require("ua-parser");

module.exports = function (app, logger) {
    app.use(express.favicon());
    app.use(express.cookieParser('secret-cookie-key'));
    app.use(express.bodyParser());

    app.use(function (req, res, next) {
        // create session-cookie for logger
        var sid;
        if (!req.cookies.loggersid) {
            // TODO: Better hashing
            sid = Math.floor(Math.random() * Math.random() * 100000000);

            res.cookie('loggersid', sid, { maxAge: 30 * 60000 });
        } else {
            sid = req.cookies.loggersid;
        }

        req.sid = sid;
        next();
    });

    app.use(express.static(__dirname + '/public'));

    app.post('/log', function (req, res) {
        var userAgent = ua.parse(req.headers['user-agent']);

        var data = {
            stack : req.param('stack')
          , file  : req.param('file')
          , line  : req.param('line')
          , time  : req.param('time')
        };

        var msg   = req.param('msg');
        var level = req.param('level') || 'info';
        var meta  = {
            browser: {
                os      : userAgent.os.toString()
              , browser : userAgent.family.toString()
              , version : userAgent.major.toString() + "." + userAgent.minor.toString()
            }
          , session: req.sid
        };

        if (data.stack) {
            meta.stack = data.stack;
        }

        if (data.time) {
            meta.time = data.time;
        }

        if (data.file) {
            meta.file = data.file;
        }

        if (data.line) {
            meta.line = data.line;
        }

        logger.log(level, msg, meta);

        res.send();
    });
};