yarn add koa-passport passport-local

const passport = require('koa-passport')
const LocalStrategy = require('passport-local').Strategy
const User = require('../../dbs/models/users')

passport.use(new LocalStrategy((username, password, done) => {
 User.findOne({username}, (err, user) => {
  if (err) return done(err)
  if (!user) return done(null, false, {message: '用戶不存在'})
  if (user.password !== password) return done(null, false, {message: '密碼錯(cuò)誤'})
  return done(null, user)
 })
}))

passport.serializeUser((user, done) => {
 done(null, user)
})

passport.deserializeUser((user, done) => {
 done(null, user)
})

module.exports = passport

app.use(passport.initialize())
app.use(passport.session())

router.post('/signin', async ctx => {
 return Passport.authenticate('local', (err, user, info, status) => {
  if (err) {
   ctx.body = {
    code:-1,
    msg:err
   }
  }else {
   if (user) {
    ctx.body = {
     code:0,
     msg:'登錄成功',
     user
    }
    return ctx.login(user)
   } else {
    ctx.body = {
     code:1,
     msg:info
    }
   }
  }
 })(ctx)
})

router.get('/getUser', async ctx => {
 if (ctx.isAuthenticated()){
  const {username, email} = ctx.session.passport.user
  ctx.body = {
   username,
   email
  }
 } else {
  ctx.body = {
   username: '',
   email: ''
  }
 }
})

router.get('/exit', async ctx => {
 await ctx.logout()
 if (!ctx.isAuthenticated()) {
  ctx.body = {
   code:0
  }
 } else {
  ctx.body = {
   code:-1
  }
 }
})