Express Basic Authentication middleware

express-basic-authentication.js

const app = require('express')()

const defaultConfig = {
  users: {
    user: 'password'
  }
}

function basicAuth({ users } = defaultConfig) {
  function reject(response) {
    response.set('WWW-Authenticate', 'Basic')
    return response.status(401).end()
  }
  return function middleware(request, response, next) {
    if (!request.headers.authorization) return reject(response)
    const [_, token] = request.headers.authorization.split(' ')
    const [user, pass] = Buffer.from(token, 'base64').toString().split(':')
    if (user in users && users[user] == pass) return next()
    return reject(response)
  }
}

app
  .get('/logout', (request, response) => {
    return response.status(401).send()
  })
  .get('/login', basicAuth(), (request, response) => {
    return response.end('Authenticated')
  })
  .listen(8080, () => {
    console.clear()
    console.log('🚀️ Running on http://localhost:8080')
  })