Setting up passport for the first time. isAuthenticated() always returning false - node.js

Question

I'm working through a learning module on authentication and security and I'm trying to get passport up and running but I seem to be having trouble. The code included below all works as you'd expect, except that when users are redirected from the /register post route to the /secrets route, they are not authenticated, in spite of .register() having worked (otherwise the logic in the route would have redirected me back to the /register get route instead of the login page via the secrets route).
require("dotenv").config();
const express = require("express");
const bodyParser = require("body-parser");
const mongoose = require("mongoose");
const ejs = require("ejs");
const session = require("express-session");
const passport = require("passport");
const passportLocalMongoose = require("passport-local-mongoose");
const app = express();
app.use(bodyParser.urlencoded({ extended: true }));
app.use(bodyParser.json());
app.use(express.static("public"));
app.set("view engine", "ejs");
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 });
mongoose.set("useCreateIndex", true);
const userSchema = new mongoose.Schema({
username: String,
password: String
});
userSchema.plugin(passportLocalMongoose);
const Users = new mongoose.model("Users", userSchema);
passport.serializeUser(Users.serializeUser());
passport.deserializeUser(Users.deserializeUser());
app.listen(3000, (req, res) => {
console.log("Listening on port 3000.");
});
app.get("/", (req, res) => {
res.render("home");
});
app.get("/login", (req, res) => {
res.render("login");
});
app.get("/register", (req, res) => {
res.render("register");
});
app.get("/secrets", (req, res) => {
console.log(req.isAuthenticated())
if (req.isAuthenticated()) {
res.render("secrets");
} else {
res.redirect("/login");
}
});
app.post("/register", (req, res) => {
console.log(req.body.username)
console.log(req.body.password)
Users.register(
{ username: req.body.username },
req.body.password,
(error, user) => {
if (error) {
console.log('there was an error: ', error);
res.redirect("/register");
} else {
passport.authenticate("local")(req, res, () => { //////////////not authenticating
res.redirect("/secrets");
});
}
}
);
});
app.post("/login", (req, res) => {});
any help figuring out why isAuthenticaed() is returning false would be greatly appreciated. thank you :)

Answer 1

You have to define your local strategy :
var passport = require('passport')
, LocalStrategy = require('passport-local').Strategy;
passport.use(new LocalStrategy(
function(username, password, done) {
User.findOne({ username: username }, function (err, user) {
if (err) { return done(err); }
if (!user) {
return done(null, false, { message: 'Incorrect username.' });
}
if (!user.validPassword(password)) {
return done(null, false, { message: 'Incorrect password.' });
}
return done(null, user);
});
}
));
here it has queried User information from the database ( Mongodb for instance) in case of successful response it will pass.