Support for client side decryption for aws_s3_file

[grosendorf]

It would be great to be able to pass in an encryption_key parameter to an aws_s3_file resource to retrieve encrypted files. The AWS Ruby SDK has great support for client side encryption/decryption of S3 objects (http://docs.aws.amazon.com/sdkforruby/api/Aws/S3/Encryption/Client.html). Unfortunately, because of the way that aws_s3_file creates files (inline remote_file with a presigned url as the source), it can't support using Aws::S3::Encryption::Client. So, since this will require a pretty serious rewrite, I wanted to see if there was community support for the idea before proceeding. Thoughts?

[ckelner]

👍