Authentication passport

app.js

const express = require("express");
const path = require("path");
const session = require("express-session");
const passport = require("passport");
const LocalStrategy = require("passport-local").Strategy;
const mongoose = require("mongoose");

const User = require("./models/user");
const {
  getUser,
  logOut,
  getHome,
  signUp,
  logIn,
} = require("./controllers/auth");

async function main() {
  await mongoose.connect(
    "mongodb+srv://tjsm:atlas@cluster0.gmezgzq.mongodb.net/?retryWrites=true&w=majority",
    {
      useNewUrlParser: true,
      useUnifiedTopology: true,
    }
  );
}
main().catch((err) => console.error(err));
const db = mongoose.connection;
db.on("error", console.error.bind(console, "mongo connection error"));

const app = express();
app.set("views", path.join(__dirname, "views"));
app.set("view engine", "pug");

app.use(session({ secret: "cats", resave: false, saveUninitialized: true }));
app.use(passport.initialize());
app.use(passport.session());

passport.use(
  new LocalStrategy(async (username, password, done) => {
    try {
      const user = await User.findOne({ username: username });
      if (!user) {
        console.log("user don't exist");
        return done(null, false, { message: "Incorrect username" });
      }
      console.log("password and hash password is", password, user.password);
      bcrypt.compare(password, user.password, (err, res) => {
        if (res) {
          // passwords match! log user in
          console.log("password  match");

          return done(null, user);
        } else {
          // passwords do not match!
          console.log("password don't match");
          return done(null, false, { message: "Incorrect password" });
        }
      });
    } catch (err) {
      return done(err);
    }
  })
);
passport.serializeUser(function (user, done) {
  done(null, user.id);
});

passport.deserializeUser(async function (id, done) {
  try {
    const user = await User.findById(id);
    done(null, user);
  } catch (err) {
    done(err);
  }
});

// Put local users

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

app.use(express.urlencoded({ extended: false }));

app.get("/", getHome);

app.post("/signup", signUp);

app.post("/login", logIn);

app.post("/logout", logOut);

app.get("/users/:id", getUser);

app.listen(3000, () => console.log("server running"));

exports.User = User;

auth.js

const passport = require("passport");
const bcrypt = require("bcryptjs");
const User = require("../models/user");
exports.getUser = (req, res) => {
  res.render("user");
};

exports.logOut = (req, res, next) => {
  req.logout(function (err) {
    if (err) {
      return next(err);
    }
    res.redirect("/");
  });
};

exports.logIn = passport.authenticate("local", {
  successRedirect: "/",
  failureRedirect: "/",
});

exports.signUp = async (req, res, next) => {
  try {
    const user = new User({
      username: req.body.username,
      password: req.body.password,
    });
    const existUser = await User.find({ username: user.username });
    if (existUser.length) {
      return res.render("index", {
        title: "Main",
        errors: ["username already used"],
      });
    }
    bcrypt.hash(user.password, 10, async (err, hashedPassword) => {
      if (err) next(err);
      user.password = hashedPassword;
      await user.save();
      req.login(user, function (err) {
        if (err) {
          return next(err);
        }
        return res.redirect("/users/" + req.user._id);
      });
    });
  } catch (err) {
    console.log(err);
  }
};

exports.getHome = async (req, res, next) => {
  try {
    const user = new User({
      username: req.body.username,
      password: req.body.password,
    });
    const existUser = await User.find({ username: user.username });
    if (existUser.length) {
      return res.render("index", {
        title: "Main",
        errors: ["username already used"],
      });
    }
    bcrypt.hash(user.password, 10, async (err, hashedPassword) => {
      if (err) next(err);
      user.password = hashedPassword;
      await user.save();
      req.login(user, function (err) {
        if (err) {
          return next(err);
        }
        return res.redirect("/users/" + req.user._id);
      });
    });
  } catch (err) {
    console.log(err);
  }
};

user.js

const mongoose = require("mongoose");

const Schema = mongoose.Schema;
const User = mongoose.model(
  "User",
  new Schema({
    username: { type: String, required: true },
    password: { type: String, required: true },
  })
);

module.exports = User;