/**
* Checks if the user is not logged in;
* If the user is not logged in then the request continued;
* If the user is logged in then the user is redirect to the index page.
*
* @function
* @see module:middleware
* @module middleware/isNotLoggedIn
* @param {Object} req - Express request object
* @param {Object} res - Express response object
* @param {Function} next - Express next middleware function
* @returns {undefined}
*/
module.exports = (req, res, next) => {
if (!req.isAuthenticated()) {
next();
} else {
res.redirect('/');
}
};