Laravel 5.x - Custom middleware for authenticating a PIN

I have read the middleware documentation for Laravel yet I feel like im misunderstanding something.

What I want to do is simply to authenticate everytime before being able to view a book.

E.g. If I go to '\book\funnybook' redirect => '\book\funnybook\authenticate' (which says enter a PIN number)

The problem I am having is:

• I dont know where to place the redirect function (middleware? controller?)
• I dont know where to retrieve the value of the user input and compare it with the database value. Meaning again where should I place it? in the middleware or controller? and how would my view call the function?

via Chebli Mohamed