Adding an authentication module

To maintain modularity and simplify the authentication process, we will create a separate module to validate the access privileges of a given user.

In your project directory, add the following file named authentication.js. Open the file and insert the following:

var db = require('./database');

module.exports = {
  database: 'OrderBase',
  collection: 'AccessTokens',
  generateToken: function (user, callback) {
    var token = {
      userID: user._id
    }
  }

  // Persist and return the token
  db.insert(this.database, this.collection, token, function (err, res) {
    if (err) {
      callback(err, null);
    } else {
      callback(null, res);
    }
  });
},
authenticate: function (user, password, callback) {
  if (user.password ==== password) {
    // Create a new token for the user
    this.generateToken(user, function (err, res) {
      callback(null, res);
  });});
  } else {
    callback({
      error: 'Authentication...