app.js

const createError = require("http-errors");
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 cookieParser = require("cookie-parser");
const logger = require("morgan");
const User = require("./models/user");
const bcryptjs = require("bcryptjs");
require("dotenv").config();

const indexRouter = require("./routes/index");
const usersRouter = require("./routes/users");
const chatRouter = require("./routes/chat");

const mongoDB = process.env.MONGODB_URI;
mongoose.connect(mongoDB);
const db = mongoose.connection;
db.on("error", console.error.bind(console, "Error connecting to MongoDB"));
db.once("connect", () => console.log("Connected to MongoDB"));

//auth
passport.use(
  new LocalStrategy(async (username, password, done) => {
    try {
      const user = await User.findOne({ username: username });
      const match = await bcryptjs.compare(password, user.password);

      if (!user) {
        return done(null, false, { message: "Incorrect username" });
      }
      if (!match) {
        // passwords do not match!
        return done(null, false, { message: "Incorrect password" });
      }
      console.log("success");
      return done(null, user);
    } catch (err) {
      return done(err);
    }
  })
);

passport.serializeUser((user, done) => {
  done(null, user.id);
});

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

const app = express();

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

app.use(logger("dev"));
app.use(express.static("public"));
app.use(express.json());
app.use(session({ secret: "cats", resave: false, saveUninitialized: true }));
app.use(passport.initialize());
app.use(passport.session());
app.use(express.urlencoded({ extended: false }));
app.use(cookieParser());
app.use(express.static(path.join(__dirname, "public")));

app.post(
  "/login",
  passport.authenticate("local", {
    successRedirect: "/chat",
    failureRedirect: "/",
  })
);

app.get("/logout", (req, res, next) => {
  req.logout((err) => {
    if (err) {
      return next(err);
    }
  });
  res.redirect("/chat");
});

app.use("/", indexRouter);
app.use("/users", usersRouter);
app.use("/chat", chatRouter);

// 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;