JWT

1. Giới thiệu

2. Cài đặt app

2.1 Các công cụ sử dụng

• Express

• Dotenv

• Mongoose

• Bcrypt

• JWT

2.1 Cài đặt API

• Register : api/user/register

Register phải trải qua các bước sau: - Check Valid (Email, password, name, sdt) - Sử dụng @Happi/Joi - Check Exist Account - Mongoose DB - Hash password - Bcrypt - Create new Account - Mongoose DB

• Login

Login cũng phải trải qua các bước sau: - Check Valid (Email, password) - Sử dụng @Happi/Joi - Check Exist Account - Mongoose DB (FindOne) - Check Hash password - Bcrypt - Save Information in header - JWT

• Authentication (Xác thực)

Để xác thực một account cần: - Verify account - JWT - Take information from ID - Mongoose DB - Send back - Express

3. Code ví dụ

Cấu trúc thư mục

// Index.js
const express = require("express");
const app = express();
const mongoose = require("mongoose");
const apiRouter = require("./controller/api");
require("dotenv").config();
const bodyParser = require("body-parser");

//Connect to database
mongoose
  .connect(process.env.URL_DATABASE)
  .then(() => console.log("Database connected."))
  .catch(() => console.log("Database error"));

//Req body handle
app.use(bodyParser.json());

//API handle
app.use("/api", apiRouter);

app.listen(3000, () => console.log("Server is listening on port 3000"));

// Use schema
const mongoose = require("mongoose");

const useSchema = new mongoose.Schema({
  name: {
    type: String,
    require: true,
    min: 6,
    max: 255,
  },
  email: {
    type: String,
    require: true,
  },
  password: {
    type: String,
    require: true,
    min: 6,
    max: 255,
  },
  date: {
    type: Date,
    default: Date.now,
  },
});

module.exports = mongoose.model("User", useSchema);

// Api.js
const express = require("express");
const router = express.Router();
const User = require("../model/userSchema");
const { validateRegister, validateLogin } = require("../BLL/validate");
const bcrypt = require("bcrypt");
const saltRounds = 10;
const jwt = require("jsonwebtoken");
const { auth } = require("../BLL/auth");

router.post("/register", async (req, res) => {
  //Check valid
  let validated = validateRegister(req.body);
  if (validated.error != null)
    return res.status(400).send(validated.error.details[0].message);

  //Check Exist Account
  const checkEmail = await User.findOne({ email: req.body.email });
  if (checkEmail) return res.status(400).send("Email is already exist.");
  //Hass Password
  const salt = await bcrypt.genSalt(saltRounds);
  const hashPassword = await bcrypt.hash(req.body.password, salt);

  //Create Account
  const user = new User({
    name: req.body.name,
    email: req.body.email,
    password: hashPassword,
  });

  try {
    const saveUser = await user.save();
    res.send(saveUser);
  } catch (error) {
    res.status(400).send(error);
  }
});

router.post("/login", async (req, res) => {
  //Check Valid
  let validated = validateLogin(req.body);
  if (validated.error != null)
    return res.status(400).send(validated.error.details[0].message);

  //Check Exist Account
  const user = await User.findOne({ email: req.body.email });
  if (!user) return res.status(400).send("Email wasn't resgistered.");

  //Compare password
  const validPass = await bcrypt.compare(req.body.password, user.password);
  if (!validPass) return res.status(400).send("Invalid password.");

  //Use JWT
  const token = jwt.sign({ _id: user._id }, process.env.TOKEN_SECRET);
  res.header("auth-token", token).send(token);
});

router.get("/post", auth, async (req, res) => {
  const user = await User.findOne({ email: req.body.email });
  res.send(user);
});

module.exports = router;

// Auth.js
const jwt = require("jsonwebtoken");

function auth(req, res, next) {
  const token = req.header("auth-token");
  if (!token) return res.status(401).send("Authentication fail");

  try {
    const verified = jwt.verify(token, process.env.TOKEN_SECRET);
    req.user = verified;
    next();
  } catch (error) {
    return res.status(401).send("Invalid token");
  }
}

module.exports.auth = auth;

// Validate.js
const Joi = require("@hapi/joi");

const validateRegister = (data) => {
  const user = {
    name: Joi.string().min(6).max(255).required(),
    password: Joi.string().min(6).required(),
    email: Joi.string().email().required(),
  };

  return Joi.validate(data, user);
};

const validateLogin = (data) => {
  const user = {
    password: Joi.string().min(6).required(),
    email: Joi.string().email().required(),
  };

  return Joi.validate(data, user);
};

module.exports.validateLogin = validateLogin;
module.exports.validateRegister = validateRegister;