passportConfig.js

//This file handles the session data into browser cookies.
const LocalStrategy = require("passport-local").Strategy;
const { authenticate } = require('passport');
const { pool } = require("./dbConfig");
const bcrypt = require("bcrypt");

function initialize(passport){
  const authenticateUser = (email, password, done)=> {
    pool.query(
      `SELECT * FROM users WHERE email = $1`, [email], (err, results)=>{
        if(err){
          throw err;
        }
        console.log(results.rows);

        if(results.rows.length > 0){
          const user = results.rows[0];

        //to compare a password to a hashed password.
        bcrypt.compare(password, user.password, (err, isMatch)=>{  //isMatch is a boolean value.
            if(err){
              throw err;
            }
            if(isMatch){
              return done(null, user)
            }else{
              return done(null, false, {message:"Password is not correct!"});
            }
          });
        }else{
          return done(null, false, {message:"Email is not registered."});
        }
      }
    );
  }
  passport.use(new LocalStrategy({ 
    usernameField: "email",
    passwordField: "password"
  }, authenticateUser
  ));

  passport.serializeUser((user, done)=> done(null, user.id));
  passport.deserializeUser((id, done)=>{
    pool.query(
      `SELECT * FROM users WHERE id = $1`, [id], (err,results)=>{
        if(err){
          throw err;
        }
        return done(null, results.rows[0]);
      }
    );
  });
}
module.exports = initialize;