Firebase Storage, What's the proper rules for user based uploading/deleting?

Question

I want to create user based security for Firebase/Storage. Below allow write works well if I do only upload images. But It prevents deleting a photo. How can I create proper sec

Answer 1

I would use this to check if you are creating/updating a file or removing it

match /users/{uid}/{filename} {
    allow write: if isCurrentUser(uid);
    allow write: if resource == null ||
         ( isImage() &&
         lessThanNMegabytes(n) &&
         request.resource !=null &&
         filename.size() < 50 );
}