app.ts

// configure the environment variables
require('dotenv').config()

global.__basedir = __dirname

// set the port
const PORT = process.env.PORT

// for async errors
import 'express-async-errors'

// bring in the database connection
import db from './src/models'

// swagger
import swaggerUI from 'swagger-ui-express'
import YAML from 'yamljs'
const swaggerDocument = YAML.load('./swagger.yaml')

// initialize the express app
import express, {Application, Request, Response} from 'express'
const app : Application = express()

// logger
import log from './src/utils/logger'

// security packages
import helmet from 'helmet'
import cors from 'cors'
const xss = require('xss-clean')
import rateLimit from 'express-rate-limit'

// import middlewares
import Routes from './src/routes'
import {errorHandlerMiddleware} from './src/middleware/error-handler'
import {notFound} from './src/middleware/not-found'
import deserializeUser from './src/middleware/deserialize-user'

// security middlewares
app.set("trust proxy", 1)
app.use(express.json())
app.use(express.urlencoded({ extended: true }))
app.use(helmet())
app.use(cors())
app.use(xss())
app.use(rateLimit({ windowMs: 60 * 1000, max: 60 }))

// deserialize user
app.use(deserializeUser)

// documentation route
app.get('/', (req: Request, res: Response) => {
    res.send('<h1>Welcome to the twitter gram documentation</h1><p>click <a href="/api-docs">here</a> to visit the docs</p>')
})

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

// app routes
app.use('/api/v1', Routes)

// not found middleware
app.use(notFound)
// error handler middleware
app.use(errorHandlerMiddleware)

// start the express app
const start = async () => {
    try {
        await db.sequelize.authenticate()
        log.info("connected to the database")
        app.listen(PORT, () => log.info(`Server started on port ${process.env.PORT}`))
    } catch (err) {
        log.error("could not connect to the database", err)
        process.exit(1)
    }
}

start()