heroic-sns

https://github.com/benzado/heroic-sns

Secure, lightweight Rack middleware for Amazon Simple Notification Service (SNS) endpoints. SNS messages are intercepted, parsed, verified, and then passed along to the web application via the 'sns.message' environment key. Heroic::SNS has no dependencies besides Rack (specifically, the aws-sdk gem is not needed). SNS message signatures are verified in order to reject forgeries and replay attacks.