Awesome

SNS support HTTP/HTTPS subscription but the endpoint needs to be exposed to the internet.

This lambda function allows you to subscribe an SNS Topic to an internal endpoint.

The trick is that you need to deploy the lambda inside the VPC.

Only one environment variable is needed ENDPOINT.

Instead of subscribing the "webhook" to the SNS Topic, you need to subscribe this lambda to the SNS Topic and provide an ENDPOINT environment variable pointing to the webhook.