geoip_index_locate.js

app.get('/locate', function(req, res) {
	
	//getting the ip of the client from the request headers or remoteAddress
	var ip = req.param("ip");
	ip = ip || req.headers['x-forwarded-for'] || req.connection.remoteAddress;
  var net = ip.split(".").slice(0,3).join(".")+".0"; //aaa.bbb.ccc.0
  
  mongodb.connect("mongodb://127.0.0.1:27017/poetic_geoips",function(err,db){
		if(err) throw err;
    var ips = db.collection("ips");
    ips.findOne({$or: [{ip: net}]},function(err,result){
			if(err) throw err;
      if(result) {
        res.end(JSON.stringify({ip: ip,location: result.location}));
      } else {
        res.end(JSON.stringify({ip: ip}));
      }
      db.close();
		});
  });
});