function basicAuth(req, res, next) {
    const authHeader = req.headers['authorization'];

    if (!authHeader || !authHeader.startsWith('Basic ')) {
        res.setHeader('WWW-Authenticate', 'Basic');
        return res.status(401).send('Authentication required.');
    }

    const base64Credentials = authHeader.split(' ')[1];
    const credentials = Buffer.from(base64Credentials, 'base64').toString('ascii');
    const [username, password] = credentials.split(':');

    const USERNAME = 'rahasia';
    const PASSWORD = 'tomat';

    if (username === USERNAME && password === PASSWORD) {
        next();
    } else {
        return res.status(403).send('Access denied.');
    }
}

module.exports = basicAuth;