sos-nextjs/api/cart.js

const router = module.exports = require('express-promise-router')()
const parseJSON = require('body-parser').json()
const db = require('../db')

const {validationResult} = require('express-validator')
const validate = require('./middleware/validators')

router.get('/', async (req, res)=>{
  res.json(req.cart);
})

const cartAddValidators = [validate.countInt]
router.post('/add/:item_uuid', parseJSON, cartAddValidators, async (req, res) => {
  // Check form input
  const errors = validationResult(req)
  if(!errors.isEmpty())
    return res.status(422).json({errors: errors.array()})

  // Ensure session
  if(!req.session.uuid)
    await db.session.create(req)

  // Ensure cart
  if(!req.cart)
    req.cart = await db.cart.create(req.session.uuid)

  // Add item
  const cart = await db.cart.addItemToCart(req.cart.uuid, req.params.item_uuid, req.body.count)

  res.json(cart)
})

router.post('/remove/:item_uuid', async (req, res) => {
  if(!req.cart) return res.json(null)

  const cart = await db.cart.removeItemFromCart(req.cart.uuid, req.params.item_uuid);

  res.json(cart)
})