app.js

const createError = require('http-errors');
const express = require('express');
const path = require('path');
const cookieParser = require('cookie-parser');
const logger = require('morgan');
const session = require('express-session'); // session
const LocalStrategy = require('passport-local').Strategy; // passport-local
const indexRouter = require('./routes/index');
const usersRouter = require('./routes/users');
const passport = require('passport');
const mongoose = require('mongoose');
const dotenv = require('dotenv'); // dotenv
const User = require('./models/User'); // mongoose
const bcrypt = require('bcryptjs'); // bcryptjs
const MongoStore = require('connect-mongo');
dotenv.config(); // dotenv
const mongoDB = process.env.MONGODB_URI; // dotenv
mongoose
  .connect(mongoDB)
  .then(() => {
    console.log('MongoDB connected…');
  })
  .catch((err) => console.log(err)); // mongoose
const db = mongoose.connection;
db.on('error', console.error.bind(console, 'MongoDB connection error:'));

const app = express();

app.use(
  session({
    secret: 'cats',
    resave: false,
    saveUninitialized: true,
    store: new MongoStore({ mongoUrl: mongoDB }),
  })
); // session
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) return done(null, false, { message: 'Incorrect username.' });
      const passwordMatch = await bcrypt.compare(password, user.password);
      if (!passwordMatch) return done(null, false, { message: 'Incorrect password.' });
      return done(null, user);
    } catch (error) {
      return done(error);
    }
  })
);

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

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

// view engine setup
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'jade');

app.use(logger('dev'));
app.use(express.json());
app.use(express.urlencoded({ extended: false }));
app.use(cookieParser());
app.use(express.static(path.join(__dirname, 'public')));

app.use('/', indexRouter);
app.use('/users', usersRouter);

// catch 404 and forward to error handler
app.use(function (req, res, next) {
  next(createError(404));
});
// error handler
app.use(function (err, req, res, next) {
  // set locals, only providing error in development
  res.locals.message = err.message;
  res.locals.error = req.app.get('env') === 'development' ? err : {};

  // render the error page
  res.status(err.status || 500);
  res.render('error');
});

module.exports = app;