app.js

require("dotenv").config();
const express = require("express");
const ejs = require("ejs");
const mongoose = require("mongoose");
const session = require("express-session");
const passport = require("passport");
const passportLocalMongoose = require("passport-local-mongoose");

const app = express();

app.use(express.static("public"));
app.set("view engine", "ejs");
app.use(
  express.urlencoded({
    extended: true,
  })
);

app.use(
  session({
    secret: "Our little secret.",
    resave: false,
    saveUninitialized: false,
  })
);

app.use(passport.initialize());
app.use(passport.session());

mongoose.connect("mongodb://localhost:27017/userDB", {
  useNewUrlParser: true,
  useUnifiedTopology: true,
});
mongoose.set("useCreateIndex", true);

const userSchema = new mongoose.Schema({
  email: String,
  password: String,
  secret: String,
});

userSchema.plugin(passportLocalMongoose);

const User = mongoose.model("User", userSchema);

passport.use(User.createStrategy());
passport.serializeUser(User.serializeUser());
passport.deserializeUser(User.deserializeUser());

app.get("/", function (req, res) {
  res.render("home");
});

app.get("/login", function (req, res) {
  res.render("login");
});

app.get("/register", function (req, res) {
  res.render("register");
});

app.get("/secrets", function (req, res) {
  User.find({ secret: { $ne: null } }, function (err, foundUsers) {
    if (err) {
      console.log(err);
    } else {
      if (foundUsers) {
        res.render("secrets", { usersWithSecrets: foundUsers });
      }
    }
  });
});

app.get("/submit", function (req, res) {
  if (req.isAuthenticated()) {
    res.render("submit");
  } else {
    res.redirect("/login");
  }
});

app.post("/submit", function (req, res) {
  const submittedSecret = req.body.secret;
  User.findById(req.user.id, function (err, foundUser) {
    if (err) {
      console.log(err);
    } else {
      if (foundUser) {
        foundUser.secret = submittedSecret;
        foundUser.save(function () {
          res.redirect("/secrets");
        });
      }
    }
  });
});

app.get("/logout", function (req, res) {
  req.logout();
  res.redirect("/");
});

app.post("/register", function (req, res) {
  User.register(
    { username: req.body.username },
    req.body.password,
    function (err, user) {
      if (err) {
        console.log(err);
        res.redirect("/register");
      } else {
        passport.authenticate("local")(req, res, function () {
          res.redirect("/secrets");
        });
      }
    }
  );
});

app.post("/login", passport.authenticate("local"), function (req, res) {
  // If this function gets called, authentication was successful.
  // `req.user` contains the authenticated user.
  res.redirect("/secrets");
});

app.listen(3000, function () {
  console.log("Server started on port 3000.");
});