Presigner
CLI allows you to create presigned URLs for S3. It use version 2 of AWS SDK for Ruby. If you would like to know about version 2 of AWS SDK for Ruby, please read the link below:
http://docs.aws.amazon.com/sdkforruby/api/Aws/S3.html
Installation
$ bundle install
$ rake build
$ rake install
Usage
$ presigner url ACCESS_KEY_ID SECRET_ACCESS_KEY BUCKET KEY