Parameters:
  CloudFrontDnsAlias:
    Type: String
  AcmCertArn:
    Type: String

Conditions:
  HasCloudFrontDnsAlias: !Not
    - !Equals
      - !Ref CloudFrontDnsAlias
      - ''
  HasAcmCertArn: !Not
    - !Equals
      - !Ref AcmCertArn
      - ''
  CreateDnsAlias: !And
    - !Condition HasCloudFrontDnsAlias
    - !Condition HasAcmCertArn