app.js

'use strict'

const path = require('node:path')
const process = require('node:process')
const express = require('express')
const timeout = require('connect-timeout')
const cookieParser = require('cookie-parser')
const bodyParser = require('body-parser')
const AV = require('leanengine')

// 加载云函数定义，你可以将云函数拆分到多个文件方便管理，但需要在主文件中加载它们
require('./cloud')

const app = express()

// 设置模板引擎
app.set('views', path.join(__dirname, 'views'))
app.set('view engine', 'ejs')

app.use(express.static('public'))

// 设置默认超时时间
app.use(timeout('15s'))

// 加载云引擎中间件
app.use(AV.express())

app.enable('trust proxy')
// 需要重定向到 HTTPS 可去除下一行的注释。
app.use(AV.Cloud.HttpsRedirect())

app.use(bodyParser.json())
app.use(bodyParser.urlencoded({ extended: false }))
app.use(cookieParser())
app.use(AV.Cloud.CookieSession({ secret: 'my secret', maxAge: 3600000, fetchUser: true }))

app.get('/', (req, res) => {
  if (req.currentUser)
    res.redirect('/comments')

  else
    res.render('index')
})

// 可以将一类的路由单独保存在一个文件中
app.use('/comments', require('./routes/comments'))
app.use('/sign-up', require('./routes/sign-up'))

// 处理登录请求（可能来自登录界面中的表单）
app.post('/login', (req, res) => {
  if (req.body.username === process.env.SMTP_USER
    || req.body.username === process.env.TO_EMAIL) {
    AV.User.logIn(req.body.username, req.body.password).then((user) => {
      res.saveCurrentUser(user) // 保存当前用户到 Cookie
      res.redirect('/comments') // 跳转到个人资料页面
    }, (error) => {
      if (error)
        console.error(error)
      // 登录失败，跳转到登录页面
      res.redirect('/')
    })
  }
  else {
    res.redirect('/')
  }
})

app.get('/resend_mails', async (req, res) => {
  res.send(await AV.Cloud.rpc('resend_mails'))
})

app.get('/verify_mail', async (req, res) => {
  res.send(await AV.Cloud.rpc('verify_mail'))
})

// 登出账号
app.get('/logout', (req, res) => {
  req.currentUser.logOut()
  res.clearCurrentUser() // 从 Cookie 中删除用户
  res.redirect('/')
})

app.use((req, res, next) => {
  // 如果任何一个路由都没有返回响应，则抛出一个 404 异常给后续的异常处理器
  if (!res.headersSent) {
    const err = new Error('Not Found')
    err.status = 404
    next(err)
  }
})
// error handlers
app.use((err, req, res) => {
  if (req.timedout && req.headers.upgrade === 'websocket') {
    // 忽略 websocket 的超时
    return
  }

  const statusCode = err.status || 500
  if (statusCode === 500)
    console.error(err.stack || err)

  if (req.timedout)
    console.error('请求超时: url=%s, timeout=%d, 请确认方法执行耗时很长，或没有正确的 response 回调。', req.originalUrl, err.timeout)

  res.status(statusCode)
  // 默认不输出异常详情
  let error = {}
  if (app.get('env') === 'development') {
    // 如果是开发环境，则将异常堆栈输出到页面，方便开发调试
    error = err
  }
  res.render('error', {
    message: err.message,
    error,
  })
})

app.locals.dateFormat = function (date) {
  const vDay = padWithZeros(date.getDate(), 2)
  const vMonth = padWithZeros(date.getMonth() + 1, 2)
  const vYear = padWithZeros(date.getFullYear(), 2)
  const vHour = padWithZeros(date.getHours(), 2)
  const vMinute = padWithZeros(date.getMinutes(), 2)
  const vSecond = padWithZeros(date.getSeconds(), 2)
  // return `${vYear}-${vMonth}-${vDay}`;
  return `${vYear}-${vMonth}-${vDay} ${vHour}:${vMinute}:${vSecond}`
}

function padWithZeros(vNumber, width) {
  let numAsString = vNumber.toString()
  while (numAsString.length < width)
    numAsString = `0${numAsString}`

  return numAsString
}

async function traverseEmailNotNotified() {
  const length = await AV.Cloud.rpc('resend_mails')
  if (length === 0)
    return
  setTimeout(() => {
    traverseEmailNotNotified()
  }, 2 * 60 * 1000)
}

setTimeout(() => {
  traverseEmailNotNotified()
}, 60 * 1000)

module.exports = app