What is the simplest way to retrieve private files from S3?

I'm building a node/express site using multer-s3 that stores a user's images on Amazon S3. I've got it working, except that the images have to be public for the user to see them. What's the simplest way to implement some security so that users have to be logged in to my site to access their files/see their images?

Submitted July 23, 2018 at 07:40PM by RecursiveBob