Templates/Blueprints/CloudFormationCustomResource/readme.txt
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This sample creates a Lambda function written in PowerShell that processes custom resource events from CloudFormation. It includes a Switch statement with placeholders for the 3 different Request Types (Create, Update and Delete) that CloudFormation sends. It also checks the event payload to see if CloudFormation delivered the event via SNS (useful in case cross-account custom resources are in place) or if CloudFormation sent the event directly to the Lambda. If the event is from SNS, it will parse out the CloudFormation event information before processing the request type. Once the event has been processed, it will send the results back to CloudFormation via Invoke-WebRequest using the pre-signed URL sent with the original event. The script contains a Requires statement for the latest version of the AWS Tools for PowerShell module. If you modify this example to not need cmdlets from that module you can safely delete this statement. |