How do I pass a string to inline lambda function in Cloudformation for S3 bucket name

Can you add the code here? Why are you using a custom resource?

MyS3Resource: Type: AWS::CloudFormation::CustomResource Properties: ServiceToken: !GetAtt S3BucketLambda.Arn BucketName: !Sub cache-${AWS::AccountId} Region: !Ref AWS::Region

S3BucketLambda: Type: AWS::Lambda::Function Properties: FunctionName: Index Handler: index.handler Runtime: python3.7 Role: !Join ["", ["arn:aws:iam::", !Ref "AWS::AccountId", ":role/companyname/aws-projectname-lambda-role"]] MemorySize: 128 Timeout: 10 Description: "Testing S3" Environment: Variables: BucketName: "cache-11223344" Code: ZipFile: | import boto3 import os import cfnresponse

      s3_client = boto3.client('s3')

      def handler(event, context):
        bucketName = event['ResourceProperties']['BucketName']
        this_event = event['RequestType']
        regionName = event['ResourceProperties']['Region']
        response_data = {}

        try:
          if this_event in ('Create', 'Update'):
            output = s3_client.head_bucket(Bucket=bucketName)
            print (output['ResponseMetadata']['HTTPStatusCode'])
        except Exception as e:
          try:
            response = s3_client.create_bucket(Bucket=bucketName)
            print (response)
            response_data['Data'] = json.dumps(response)
          except Exception as e:
            print (str (e))