Describe the feature

The existsFilter method of SubscriptionFilter class does not take any parameters and hard codes the value to true. I want to be able to set the value to false.

See: https://docs.aws.amazon.com/sns/latest/dg/attribute-key-matching.html

Use Case

I want to subscribe to messages on a topic that do not include the specified property.

Proposed Solution

In: https://github.com/aws/aws-cdk/blob/main/packages/aws-cdk-lib/aws-sns/lib/subscription-filter.ts

Add a default parameter on the existsFilter method that has default value true for backwards compatibility.

  /**
   * Returns a subscription filter for attribute key matching.
   */
  public static existsFilter(existsCondition: boolean = true) {
    return new SubscriptionFilter([{ exists: existsCondition }]);
  }

Other Information

No response

Acknowledgements

• I may be able to implement this feature request
• This feature might incur a breaking change

AWS CDK Library version (aws-cdk-lib)

2.198.0

AWS CDK CLI version

2.1018.0 (build e629e30)

Environment details (OS name and version, etc.)

WSL Ubuntu 22.04.5