definma-api/src/routes/user.ts

import express from 'express';
import mongoose from 'mongoose';
import bcrypt from 'bcryptjs';
import UserValidate from './validate/user';
import UserModel from '../models/user';

const router = express.Router();

router.get('/users', (req, res) => {
  res.json({message: 'users up and running!'});
});

router.post('/user/new', (req, res, next) => {
  // validate input
  const {error, value: user} = UserValidate.input(req.body);
  if(error !== undefined) {
    res.status(400).json({status: 'Invalid body format'});
    return;
  }

  // check that user does not already exist
  UserModel.find({name: user.name}).lean().exec( 'find', (err, data) => {
    if (err) next(err);
    if (data.length > 0) {
      res.status(400).json({status: 'Username already taken'});
      return;
    }

    user.key = mongoose.Types.ObjectId();  // use object id as unique API key
    bcrypt.hash(user.pass, 10, (err, hash) => {  // password hashing
      user.pass = hash;
      new UserModel(user).save((err, data) => {  // store user
        if (err) next(err);
        res.json(UserValidate.output(data.toObject()));
      });
    });
  });
});

module.exports = router;