I'm new to Google Cloud and recently I've set up the bucket as the origin for cloud CDN. All is fine but I have a question. Can you and if so how private access to the bucket, so the only way to get the data is through cloud cdn IP not through storage.googleapis.com/bucketname/filename
I agree with Mr @JohnHanley mentioned. Posting this information as an answer for other users to understand this concern.
Basically what you based on what Mr Hanley mentioned is Cloud Storage permission and for strict access and for authorized user you can use signed url