register.js

/**
 * Creates a new User, begins a session, and responds with a SessionToken.
 *
 * @param {Request} req
 * @param {Response} res
 */
function register(req, res) {
  if(req.user) {
    res.status(400).send('User already exists');
  } else {
    User.create({userId: req.body.userId}, function(err, user) {
      if (err) {
        res.sendStatus(400);
      } else {
        user.setPassword(req.body.password);
        req.session.user = user;
        SessionToken.create(user, function(err, sessionToken) {
          if (err) {
            console.log(err);
            res.sendStatus(500);
          } else {
            console.log(sessionToken);
            res.status(201).json(sessionToken);
          }
        });
      }
    });
  }
}