app.js

const express = require('express')
const app = express()
const morgan = require('morgan')
const bodyParser = require('body-parser')
const mongoose = require('mongoose')

const productRoutes = require('./api/routes/products')
const orderRoutes = require('./api/routes/orders')
const userRoutes = require('./api/routes/user')

const swaggerUi = require('swagger-ui-express');
const swaggerDocument = require('./swagger/swagger.json');

app.use('/api-docs', swaggerUi.serve, swaggerUi.setup(swaggerDocument));

const mongoDbURL = process.env.MONGODB_URL || 'mongodb://mongo/api_demo'

mongoose.connect(mongoDbURL, { useNewUrlParser: true } )

app.use(morgan('dev'))
app.use(bodyParser.urlencoded({extended: false}))
app.use(bodyParser.json())

app.use((req, res, next) => {
    res.header('Access-Control-Allow-Origin', '*')
    res.header('Access-Contol-Allow-Headers','Origin, X-Requested-With, Content-Type, Accept, Authorization ')
    if(req.method === 'OPTIONS') {
        res.header('Access-Control-Allow-Methods', 'PUT, POST, PATCH, DELETE, GET')
        return res.status(200).json({})
    }
    next()
})

app.use('/products', productRoutes)
app.use('/orders', orderRoutes)
app.use('/user', userRoutes)

app.use((req, res, next) => {
    const error = new Error('not found')
    error.status = 404
    next(error)
})

app.use((error, req, res, next) => {
    res.status(error.status || 500).json({
        error:{
            message: error.message
        }
    })
})
module.exports = app