server.js

//requiring all the modules
const express = require("express");
const bodyParser =  require("body-parser");
const ejs = require("ejs");
const mongoose = require("mongoose");
const session = require('express-session');
const passport = require('passport');
const passportLocalMongoose= require('passport-local-mongoose');
require('dotenv').config()
 
 
const app = express();
 
app.use(express.static(__dirname+"/public"));
app.set("view engine","ejs");
app.set("views",__dirname+"/views")
app.use(bodyParser.urlencoded({
    extended:true
}));
 
//setting up the session module that has various options, explained.
app.use(session({
  secret: "Our Little Secret", 
 
  resave: false,
 
  saveUninitialized:false  
}));
 
 
 
 
app.use(passport.initialize());
app.use(passport.session());
 
 
main().catch(err => console.log(err));
 
async function main() {
    await mongoose.connect(process.env.MONGO_URL)
   
}
 
 
 
const userSchema = new mongoose.Schema({
email: String,
password: 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){
  if(req.isAuthenticated()){
    res.render("secrets");
  } else {
    res.redirect("/login");
  }
});
 
app.get("/logout",function(req,res){
  req.logOut(function(err){
    if(err){
      console.log(err);
    }
  });
  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",function(req,res){
    const user = new User({
      username:req.body.username,
      password:req.body.password
    })
 
    req.login(user,function(err){
 
      if (err) { 
        console.log(err);
        res.redirect("/login");
       } else {
        passport.authenticate("local")(req,res,function(){
          res.redirect("/secrets");
        })
        
       }
     
    });
})
 
app.listen(3000,function () {
    console.log("Server Running at port 3000.");
  })