router.post('/api/users/authenticate', function(req, res, next)
{


    var username = req.body.username;
    var password = req.body.password;

    console.log("post authentication request received.\n");

    console.log("username is: " + username + "\n");
    console.log("password is: " + password + "\n");


    var url = 'mongodb://localhost/admin';

    var authenticate = function(db, callback)
    {



        var cursor = db.collection('users').find
        (



            {"username" : username, "password" : password}
                        //{"username" : "user", "password" : "pass"}
                        //{"_id" : ObjectId("580c074cffc27c14fffe126c")}





        );


        var isAuthenticated = false;

        cursor.each(function(err,doc)
        {

                if (err)
                {
                    console.log(err);

                }
                else
                {
                    console.log('Fetched:', doc);

                    isAuthenticated = true;

                    console.log("succesfully authenticated1. ");

                    console.log("isAuthenticated1 is: " + isAuthenticated + "\n");








                }




        });


        callback(isAuthenticated);




    };

    MongoClient.connect(url, function(err, db)
    {
        assert.equal(null, err);
        authenticate(db, function(isAuthenticated)
        {

            //res.writeHead(200, {"Content-Type": "text/plain"});

            console.log("callback ran <<<<<<<<<-----------");
            console.log("isAuthenticated3 is: " + isAuthenticated + "\n");

            if (isAuthenticated == true)
            {
                    res.json({authenticated: 'true'});
            }


            else
            {

                    res.json({authenticated: 'false'});

            }


            //res.end(JSON.stringify(array));
            //res.json(JSON.stringify(array));


            db.close();
        });
    });



    //res.json({status: 'user added'});

    //console.log("price: " + price);

    //res.json({'message': 'product put', 'price': price});



});