So, while working on a project where having a file post.js

In which we have getStaticProps which does 2 things:

1. Validate the user if user is 
not valid redirect to login page

2. Fetch the post related data from external API endpoint

I am new to this, I've heard about revalidate option in getStaticProps to cache the response, i need the same thing to cache post details but I need to also verify that user is valid or not

Can I do something that only caches the post details but check validity of user every time?

Thanks, I'm going too frustrated to this situation, please help how to approach this problem!!!