Lambda function in a CloudFormation template to copy an asset from one bucket to another

template.yaml

S3AssetCopyFunction:
  Type: AWS::Lambda::Function
  Properties:
    FunctionName: S3AssetCopy
    Handler: index.handler
    Role: !GetAtt LambdaExecutionRole.Arn
    MemorySize: 4096
    Runtime: python3.12
    Timeout: 30
    Code:
      ZipFile: |
        import boto3
        import cfnresponse
        def handler(event, context):
          try:          
            rp = event['ResourceProperties']
            boto3.resource('s3').Object(rp['DESTINATION_BUCKET'], rp['DESTINATION_KEY']).copy_from(CopySource=rp['SOURCE_BUCKET'] + '/' + rp['SOURCE_KEY'])
            cfnresponse.send(event, context, cfnresponse.SUCCESS, {})
          except Exception as e:
            cfnresponse.send(event, context, cfnresponse.FAILED, {})

UploadHTMLSampleStaticWebsite:
  Type: Custom::S3AssetCopyFunction
  Properties:
    ServiceToken: !GetAtt S3AssetCopyFunction.Arn
    SOURCE_BUCKET: !Ref AssetsBucketName
    SOURCE_KEY: !Sub ${AssetsBucketPrefix}file.html
    DESTINATION_BUCKET: !Ref ParticipantAssetsBucket
    DESTINATION_KEY: file.html