app.js

require("dotenv").config();
const session = require("express-session");
const passport = require("passport");
const bcrypt = require("bcryptjs");
const LocalStrategy = require("passport-local").Strategy;
const createError = require("http-errors");
const express = require("express");
const path = require("path");
const cookieParser = require("cookie-parser");
const logger = require("morgan");
const favicon = require("serve-favicon");
const helmet = require("helmet");
const User = require("./models/userModel");

const indexRouter = require("./routes/index");

const app = express();

// Set up mongoose connection
const mongoose = require("mongoose");
const mongoDB = process.env.MONGODB_URL_STRING;
mongoose.connect(mongoDB, { useNewUrlParser: true, useUnifiedTopology: true });
const db = mongoose.connection;
db.on("error", console.error.bind(console, "MongoDB connection error:"));

// view engine setup
app.set("views", path.join(__dirname, "views"));
app.set("view engine", "pug");

app.use(
  session({
    secret: process.env.SESSION_SECRET,
    resave: false,
    saveUninitialized: true,
  })
);
app.use(passport.initialize());
app.use(passport.session());
app.use(function (req, res, next) {
  res.locals.currentUser = req.user;
  next();
});

app.use(logger("dev"));
app.use(express.json());
app.use(express.urlencoded({ extended: false }));
app.use(cookieParser());
app.use(
  helmet({
    contentSecurityPolicy: false,
  })
);
app.use(express.static(path.join(__dirname, "public")));
app.use(favicon(path.join(__dirname, "public", "favicon.ico")));

app.use("/", indexRouter);

// Checks username and password
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 res = await bcrypt.compare(password, user.password);
      if (res) {
        // passwords match! log user in
        return done(null, user);
      } else {
        // passwords do not match!
        return done(null, false, { message: "Incorrect password" });
      }
    } catch (err) {
      return done(err);
    }
  })
);

// sessions and serialization
passport.serializeUser(function (user, done) {
  done(null, user.id);
});

passport.deserializeUser(function (id, done) {
  User.findById(id, function (err, user) {
    done(err, user);
  });
});

// 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;