meow-koa-login-example/auth.js

const passport = require('koa-passport')

const fetchUser = (() => {
  // This is an example! Use password hashing in your project and avoid storing passwords in your code
  const user = { id: 55667788, username: 'meow', password: 'testmeow' }
  return async function() {
    return user
  }
})()

passport.serializeUser(function(user, done) {
  done(null, user.id)
})

passport.deserializeUser(async function(id, done) {
  try {
    const user = await fetchUser()
    done(null, user)
  } catch(err) {
    done(err)
  }
})

const LocalStrategy = require('passport-local').Strategy
passport.use(new LocalStrategy(function(username, password, done) {
  fetchUser()
    .then(user => {
      if (username === user.username && password === user.password) {
        done(null, user)
      } else {
        done(null, false)
      }
    })
    .catch(err => done(err))
}))