node.js极简登录注册

user路由里面的代码

var express = require('express');
var router = express.Router();
var path = require('path');
var fs = require('fs');

/* 登录 */
router.post('/login', async (req, res, next) => {
  var username = req.body.username
  var password = req.body.password

  var findJson = () => {
    return new Promise((resolve, reject) => {
      fs.readFile(path.join(__dirname, '../data/users.json'), function (err, data) {
        if (err) {
          resolve({ code: 500, msg: '登录失败' + err })
          return console.error(err);
        }
        var users = data.toString();
        users = JSON.parse(users);

        // 查找用户
        var user = users.find(function (item) {
          return item.username === username && item.password === password;
        });

        if (user) {
          var token = 'qwertyuiopasdfghjklzxcvbnm'
          var loginUser = {
            username,
            avatar: 'http://localhost:5000/public/images/avatar.jpg',
            city: '广东省深圳市',
            phone: '12345678910'
          }
          resolve({ code: 200, data: { token, loginUser }, msg: '登录成功' });
        } else {
          resolve({ code: 500, msg: '账号或密码错误' });
        }
      })
    })
  }

  var data = await findJson()
  res.send(data)
});

/* 注册 */
router.post('/register', async (req, res, next) => {
  var username = req.body.username
  var password = req.body.password

  var writeJson = () => {
    return new Promise((resolve, reject) => {
      fs.readFile(path.join(__dirname, '../data/users.json'), function (err, data) {
        if (err) {
          resolve({ code: 500, msg: '注册失败' + err })
          return console.error(err);
        }
        var users = data.toString();
        users = JSON.parse(users);

        // 查找用户
        var user = users.find((item) => item.username === username);
        if (user) {
          resolve({ code: 500, msg: '该用户已注册' })
        } else {
          users.push({ username, password })
          var str = JSON.stringify(users);
          fs.writeFile(path.join(__dirname, '../data/users.json'), str, function (err) {
            if (err) {
              resolve({ code: 500, msg: '注册失败' + err })
            }
            resolve({ code: 200, msg: '注册成功' });
          })
        }
      })
    })
  }

  var data = await writeJson()
  res.send(data)
});

module.exports = router;
           

创建中间件路由拦截

// token校验
app.use((req, res, next) => {
  if (req.url != '/user/login' && req.url != '/user/register' && !req.url.startsWith("/public")) {
    let token = req.headers.authorization;
    // 如果考验通过就next，否则就返回登陆信息不正确
    if (token === undefined) {
      res.send({ status: 200, msg: "令牌不能为空" })
    } else if (token === 'qwertyuiopasdfghjklzxcvbnm') {
      next();
    } else {
      res.send({ status: 200, msg: "令牌失效" })
    }
  } else {
    next();
  }
});
           

发送图片静态资源

app.get('/public/images/*', function (req, res) {
  res.sendFile(__dirname + "/" + req.url);
})