Node.js を使用してオンライン Q&A コミュニティ機能を実装する Web プロジェクト

npm install express --save

// 引入相关库
const bcrypt = require('bcrypt')
const { User } = require('../models')

// 用户注册
const register = async (req, res, next) => {
  try {
    const { username, password } = req.body

    if (!username || !password) {
      return res.status(400).send('用户名或密码不能为空')
    }

    const user = await User.findOne({ username })

    if (user) {
      return res.status(400).send('该用户名已被占用，请更换其他用户名')
    }

    const salt = await bcrypt.genSalt(10)
    const hash = await bcrypt.hash(password, salt)

    const newUser = await User.create({
      username,
      password: hash,
    })

    return res.status(201).send(newUser)
  } catch (err) {
    next(err)
  }
}

module.exports = {
  register,
}

// 引入相关库
const passport = require('passport')

// 用户登录
const login = async (req, res, next) => {
  passport.authenticate('local', (err, user, info) => {
    if (err) {
      return next(err)
    }
    if (!user) {
      return res.status(401).send(info.message)
    }
    req.logIn(user, (err) => {
      if (err) {
        return next(err)
      }
      return res.status(200).send(user)
    })
  })(req, res, next)
}

module.exports = {
  login,
}

// 引入相关库
const { Question } = require('../models')

// 提问
const ask = async (req, res, next) => {
  try {
    const { question, description } = req.body

    if (!question) {
      return res.status(400).send('问题不能为空')
    }

    const newQuestion = await Question.create({
      question,
      description,
      userId: req.user.id,
    })

    return res.status(201).send(newQuestion)
  } catch (err) {
    next(err)
  }
}

module.exports = {
  ask,
}

// 引入相关库
const { Answer, Question } = require('../models')

// 回答问题
const answer = async (req, res, next) => {
  try {
    const { content } = req.body
    const { questionId } = req.params

    if (!content) {
      return res.status(400).send('回答不能为空')
    }

    const question = await Question.findOne({
      _id: questionId,
    })

    if (!question) {
      return res.status(404).send('未找到该问题')
    }

    const newAnswer = await Answer.create({
      content,
      userId: req.user.id,
      questionId: question._id,
    })

    return res.status(201).send(newAnswer)
  } catch (err) {
    next(err)
  }
}

module.exports = {
  answer,
}