This plugin provides a way to receives messages easily from Amazon SNS topics.
SNS provides a HTTP subscription, which will send messages as JSON payloads to HTTP endpoints. Although this seems simple, Amazon defines a mini-protocol which these endpoints must conform to.
This plugin defines a grails filter which intercepts any controller mapped to URI "/sns/**". The filter implements the subscription protocol as defined by Amazon, removing this burden from your controller.
Your controller get incoming messages from request.message, which is just a string (the message body).