I've looked at the documentation for aws s3
and aws s3api
but I can't see anything relevant to generating a presigned url. The AWS web docs only show examples for doing this with Java, .Net, and VisualStudio.
http://docs.aws.amazon.com/AmazonS3/latest/dev/ShareObjectPreSignedURLJavaSDK.html
This is available native in the aws cli now: http://docs.aws.amazon.com/cli/latest/reference/s3/presign.html