Filter policy support for SNS events

[joshm91]

Hi guys,

It'd be great to be able to support the new(-ish) Filter Policy feature in SNS when specifying an SNS event on a Lambda function.

Something like this would be perfect:

  myLambda:
    Type: AWS::Serverless::Function
    Properties:
      Handler: lambda_handlers.handler
      ...
      Events:
        SNS:
          Type: SNS
          Properties:
            Topic: !GetAtt someSnsTopic.Arn
            FilterPolicy:
              AttributeName1:
                - value1
                - value2
              AttributeName2:
                - value3

[jfuss]

@joshm91 Filter Policy is not available for CloudFormation just yet and therefore not able to be apart of SAM. Marking this as a feature request.

[Nr18]

Just yet 🤔so it’s coming 🤪

[joshm91]

Fair enough, thanks!

[oharaandrew314]

Yes, this would be great. I have several lambdas listening to one SNS topic, and I would vastly prefer being able to filter outside of the lambda invocation. As it is now, my invocation counts aren't very useful.

[kevohagan]

@jfuss is this available in CloudFormation now? this would be great in sam! thx

[vrivellino]

It looks like it's available now: https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/ReleaseHistory.html

[otaviofff]

Yes, it's available now. You can find more information about it in this blog post. Hope it's helpful =)

https://aws.amazon.com/blogs/compute/managing-amazon-sns-subscription-attributes-with-aws-cloudformation/

[bottemav]

@joshm91 In the CloudFormation template one can also filter on a prefix or a numeric value matching. Do you need this too or does whitelisting (exact string matching) satisfy your use case?

[brettstack]

Happy to take PRs on this.

[bottemav]

@brettstack a PR is available.