Implement login registration function code (Node.js+Express+MongoDB)

This article mainly introduces Node+Express+MongoDB to realize the login and registration function. Friends who need it can refer to it

Inject MongoDB dependency

var mongoose = require("mongoose");

Due to the need for form processing, the bodyParser middleware needs to be used

The bodyParser module does file parsing and formats the data in the form

var bodyParser = require("body-parser"); 
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: true }));

To save user information after logging in, you need to use session middleware, which relies on cookieParser middleware

var cookieParser = require('cookie-parser');
var session = require('express-session');
ar mongoStore = require('connect-mongo')(session);
var dbUrl = 'mongodb://localhost/express';
app.use(cookieParser()); 
app.use(session({
 secret:'express',
 store: new mongoStore({
 url: dbUrl,
 collection: 'sessions'
 })
}));

Use jade template

layout .jade

doctype html
html
 head
  meta(charset='utf-8')
  title #{title}
  include ./includes/head
 body
  include ./includes/header
  block content

head.jade

##

link(href='css/main.css', rel='stylesheet')
link(href="/libs/bootstrap/dist/css/bootstrap.min.css" rel="external nofollow" , rel="stylesheet")
script(src="/libs/jquery/dist/jquery.min.js")
script(src="/libs/bootstrap/dist/js/bootstrap.min.js")

header.jade

.container
 .row
  .page-header
   h1 #{title}
.navbar.navbar-default.navbar-fixed-bottom
 .container
  if user
   p.navbar-text.navbar-right
    span 欢迎你,#{user.name}
    span  | 
    a.navbar-link(href="/layout" rel="external nofollow" ) 退出登录
  else
   p.navbar-text.navbar-right
    a.navbar-link(href="/signup" rel="external nofollow" , data-toggle="modal", data-target="#signupModal") 注册
    span  | 
    a.navbar-link(href="/login" rel="external nofollow" , data-toggle="modal", data-target="#signinModal") 登录

signup.jade

include ../layout
 block content
  form.form-horizontal( role="form", method="POST", action='/user/signup')
   .form-group
    label.col-sm-2.control-label(for="signupName") 用户名
    .col-sm-10
     input#signupName.form-control(type="text", name="user[name]", placeholder="输入用户名")
   .form-group
    label.col-sm-2.control-label(for="signuppassword") 密码
    .col-sm-10
     input#signuppassword.form-control(type="password", name="user[password]", placeholder="输入密码")
   .form-group
    label.col-sm-2.control-label(for="signupemail") 邮箱
    .col-sm-10
     input#signupemail.form-control(type="email", name="user[email]", placeholder="输入邮箱")
   .form-group
    .col-sm-offset-2.col-sm-10
     button.btn.btn-default(type="submit") 完成注册

Configuration routing

Login registration page

// 注册页面
app.get('/signup', function (req,res) {
 res.render('signup', {
 title: '注册'
 });
});
// 登录页面
app.get('/login', function (req,res) {
 res.render('login', {
 title: '登录'
 });
});

Registration function

// 注册表单
app.post('/user/signup', function (req,res) {
 var _user = req.body.user;
 User.findOne({name:_user.name}, function (err, user) {
 if(err){
  console.log(err);
 }
 if(user) {
  return res.redirect('/login');
 } else {
  var user = new User(_user);
  user.save(function (err, user) {
  if(err){
   console.log(err);
   res.redirect('/signup');
  }
  console.log('注册成功——用户名:' + user);
  res.redirect('/login'); 
  });
 }
 });
});

Login function

// 登录表单
app.post('/user/login', function (req,res) {
 var _user = req.body.user;
 var name = _user.name;
 var password = _user.password;
 User.findOne({name:name}, function (err, user) {
 if(err){
  console.log(err);
 }
 if(!user) {
  return res.redirect('/signup');
 }
 user.comparePassword(password, function (err, isMatch) {
  if (err){
  console.log(err);
  }
  if (isMatch) {
  req.session.user = user; // 用户名存入session中
  console.log('登录成功——用户名: ' + user);
  return res.redirect('/');
  } else {
  return res.redirect('/lgoin');
  }
 });
 });
});

Log out

app.get('/layout', function(req,res){
 delete req.session.user;
 //delete app.locals.user; // 删除全局变量user,否则点击退出登录,页面无变化
 res.redirect('/');
});

Log in registered database operation

Connect to the database

mongoose.connect("mongodb://localhost/express"); // 连接数据库

schema schema definition

Data update and search, and password Add salt

//schemas/user.js
var mongoose = require('mongoose');
var bcrypt = require('bcrypt');
var SALT_WORK_FSCTOR = 10; // 计算强度,越大破解越困难
var UserSchema = new mongoose.Schema({
 name: {
 unique: true,
 type:String
 },
 password: String,
 email:String,
 meta: {
 createAt: {
  type: Date,
  default: Date.now()
 },
 updateAt: {
  type: Date,
  default: Date.now()
 }
 }
});
//每次存入数据时都进行判断
UserSchema.pre('save', function (next) {
 var user = this;
 if (this.isNew) { // 数据是新数据
 this.meta.createAt = this.meta.updateAt = Date.now();
 } else {
 this.meta.updateAt = Date.now();
 }
 //密码 加盐
 bcrypt.genSalt(SALT_WORK_FSCTOR, function (err, salt) {
 if (err) {
  return next(err);
 }
 bcrypt.hash(user.password, salt, function (err, hash) {
  if (err) {
  return next(err);
  }
  user.password = hash;
  next();
 });
 });
});
UserSchema.methods = {
 comparePassword: function (_password, cb) {
 bcrypt.compare(_password, this.password, function (err, isMatch) {
  if (err) {
  return cb(err);
  }
  cb(null, isMatch);
 })
 }
};
UserSchema.statics = {
 fetch: function (cb) {
 return this
  .find({})
  .sort('meta.updateAt')
  .exec(cb);
 },
 findById: function (id, cb) {
 return this
  .findOne({_id: id})
  .exec(cb)
 }
};

module.exports = UserSchema;

modelCompile model

// models/user.js
var mongoose = require('mongoose');
//模式
var UserSchema = require('../schemas/user');
//编译模型
var User = mongoose.model('user',UserSchema);
module.exports = User;

Entry file injection

##

//app.js
var User = require('./models/user');
app.set('view engine', 'jade'); // jade模板引擎
app.set("views", "./views/pages/"); // 视图根目录
var serveStatic = require('serve-static'); // 静态文件处理
app.use(serveStatic('public')); // 路径：public

Authentication middleware

Get the user name of the session, Store it in locals and expose it to the view, that is, the user can be obtained from header.jade.

app.use(function (req, res, next) {
 var _user = req.session.user;
 app.locals.user = _user;
 return next();
});

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