AWSTemplateFormatVersion: "2010-09-09"
Transform: Explode
Mappings:
  BucketMap:
    Monthly:
      ResourceName: MyThirtyDayBucket
      Retention: 30
    Yearly:
      Retention: 365

Resources:
  Bucket:
    ExplodeMap: BucketMap
    Type: AWS::S3::Bucket
    Properties:
      LifecycleConfiguration:
        Rules:
          -
            ExpirationInDays: "!Explode Retention"
            Status: Enabled
  NonExplodingBucket:
    Type: AWS::S3::Bucket