utils.js

import jwt from 'jsonwebtoken'

export const generateToken = (user) => {
    // For creating JSON web token for particular user
    // Here jwt is taking 3 parameters to create token
    return jwt.sign({
        _id: user._id,
        name: user.name,
        email: user.email,
        isAdmin: user.isAdmin,
    }, process.env.JWT_SECRET || 'somethingsecret',
    {
        expiresIn: '30d',
    });
}

export const isAuth = (req,res,next) => {
    const authorization = req.headers.authorization;

    if(authorization){
        const token = authorization.slice(7, authorization.length);
        jwt.verify(token, process.env.JWT_SECRET || 'somethingsecret',
        (err,decode) => {
            if(err){
                res.status(401).send({message: "Invalid token"});
            }
            else{
                req.user = decode;
                next();
            }
        })
    }
    else{
        res.status(401).send({message: "No token"});
    }
}

export const isAdmin = (req,res,next) => {
    if(req.user && req.user.isAdmin) {
        next();
    }
    else{
        res.status(401).send({message: "Invalid admin token"});
    }
}