Obtain ARN of SNS subscription set up automatically by SLS

Serverless Framework
, ,
1

I use SLS to create a lambda function with an SNS topic event trigger:

MyFunc:
  handler: ...
  events:
    - sns:
        arn: arn:aws:sns:eu-west-1:xxxxxxxxx:some_topic-prod # from a stack variable

This renders the following in CF:

"MyFuncSnsSubscriptionSometopicprod": {
      "Type": "AWS::SNS::Subscription",
      "Properties": {
        "TopicArn": "arn: arn:aws:sns:eu-west-1:xxxxxxxxx:some_topic-prod",
        "Protocol": "lambda",
        "Endpoint": {
          "Fn::GetAtt": [
            "MyFuncLambdaFunction",
            "Arn"
          ]
        }
      }
    }

Now, I need to pass the ARN of the subscription (not the topic) to my lambda function as an environment variable. How can I get a reference to this resource?

There are some tricks regarding getting the CF name of another lambda function etc which I’m already aware of (function name + “LambdaFunction”), but here it gets very ugly to reference the resource by the name generated by SLS, which seems to be Function name + “SnsSubscription” + name of SNS topic converted to titlecase and with all special characters stripped away. :confused:

Is there some clever way to either choose the name of the SNS subscription so that I can use !Ref ANameThatIChose, or is there a plugin or something to scan the CF template for a resource matching a criteria (e.g. type: AWS::SNS::Subscription)?
Or do I have to skip generating this event and manually create the CF for it? :frowning: