create-bz-mern-app/template/backend/src/controllers/authController.js

CLI to scaffold a fullstack React + Node.js app with Google login and JWT auth

import { OAuth2Client } from 'google-auth-library';
import {User as userModel} from '../models/user/user.model.js';
import jwt from 'jsonwebtoken';

const oAuthClient = new OAuth2Client(
  process.env.GOOGLE_CLIENT_ID,
  process.env.GOOGLE_CLIENT_SECRET,
);

export const loginWithGoogle = async (req, res) => {

    try {

        const { token } = req.body;
        if(!token) {
            console.error("Google token not found for login in with google. Sending bad request");
            return res.status(400).json({ status: "BAD_REQUEST", message: "Google token not found" });
        }

        let ticket;
        
        try {

            console.log("Verifying the token of user with google.");

            console.log("printing client", process.env.GOOGLE_CLIENT_ID)
            ticket = await oAuthClient.verifyIdToken({
                idToken: token,
                audience: process.env.GOOGLE_CLIENT_ID
            });

        } catch (error) {
            console.error("Error in validating google token", error.message);
            return res.status(500).json({ status: "INTERNAL_SERVER_ERROR", message: "Error in validating google token id"});
        }

        const { 
            email, 
            picture, 
            given_name: firstName, 
            family_name: lastName 
        } = ticket.getPayload();

        console.log("Finding the user from mongodb");
        let user = await userModel.findOne({ email });

        // if user is not present then we will sign it up by creating the record of user
        if(!user) {

            console.log("User not found in mongodb. Creating the new accound for user.");
            try {

                user = await userModel.create({
                    name: `${firstName} ${lastName ?? ""}`.trim(),
                    email: email,
                    avatar: picture,
                    role: 'user'
                });

            } catch (error) {
                console.log("Error occurred while creating the user in mongodb in loginWithGoogle", error.message);
                return res.status(500).json({ status: "INTERNAL_SERVER_ERROR", message: "Something went wrong while creating the user."});
            }
        } 

        console.log("Generating the jwt token for user.");
        const userToken = jwt.sign({ id: user._id, role: user.role }, process.env.JWT_SECRET, { expiresIn: "7d" })

        console.log("Token Generated. Setting the token to cookies as jwt.");
        res.cookie("jwt", 
            userToken, 
            { 
                maxAge: 7 * 24 * 60 * 60 * 1000,
                httpOnly: true, 
                sameSite: 'lax' 
            }
        );

        return res.status(200).json({ 
            status: "SUCCESS", 
            message: "Login Successfully!",
            data: { 
                name: user.name, 
                email: user.email, 
                token: userToken, 
                avatar: user.avatar 
            } 
        });

    } catch (error) {

        console.error("Error in loginWithGoogle", error.message);
        return res.status(500).json({ message: "Something Went Wrong", error: error.message });
    }
}