app.js

const express = require("express");
const app = express();
const cors = require("cors");
const { hashSync, compareSync } = require("bcrypt");
const UserModel = require("./config/database");
const jwt = require("jsonwebtoken");
const passport = require("passport");

app.use(express.json());
app.use(express.urlencoded({ extended: true }));
app.use(cors());
app.use(passport.initialize());

require("./config/passport");

app.post("/register", (req, res) => {
	const user = new UserModel({
		username: req.body.username,
		password: hashSync(req.body.password, 10),
	});

	user
		.save()
		.then((user) => {
			res.send({
				success: true,
				message: "User created successfully.",
				user: {
					id: user._id,
					username: user.username,
				},
			});
		})
		.catch((err) => {
			res.send({
				success: false,
				message: "Something went wrong",
				error: err,
			});
		});
});

app.post("/login", (req, res) => {
	UserModel.findOne({ username: req.body.username }).then((user) => {
		//No user found
		if (!user) {
			return res.status(401).send({
				success: false,
				message: "Could not find the user.",
			});
		}

		//Incorrect password
		if (!compareSync(req.body.password, user.password)) {
			return res.status(401).send({
				success: false,
				message: "Incorrect password",
			});
		}

		const payload = {
			username: user.username,
			id: user._id,
		};

		const token = jwt.sign(payload, "Random string", { expiresIn: "1d" });

		return res.status(200).send({
			success: true,
			message: "Logged in successfully!",
			token: "Bearer " + token,
		});
	});
});

app.get(
	"/protected",
	passport.authenticate("jwt", { session: false }),
	(req, res) => {
		return res.status(200).send({
			success: true,
			user: {
				id: req.user._id,
				username: req.user.username,
			},
		});
	}
);

app.listen(5000, () => console.log("Listening to port 5000"));