Howto specify 'Raw Message Delivery' for an SNS subscription using AWS CloudFormation?

Question

I\'ve got an AWS CloudFormation template that creates an SNS topic and a subscription:

\"AcceptedTopic\":{
            \"Type\": \"AWS::SNS::Topic\"         


        

Answer 1

Now AWS CloudFormation supports it with AWS::SNS::Subscription. So instead of adding the subscription as a property of the topic, add an Subscription resource linked above.

A caveat though, is that if you already created a topic with that subscription and are now trying to add the attribute, it'd fail miserably with Invalid Parameter error. The cause is it's considering the standalone Subscription added in the template as a new resource and trying to create it. I haven't found a good way around this other than deleting that subscription manually, which is not good practice in production environment.

My solution around this is separating it into 2 steps. First, remove the property subscription from the topic and add a Subscription resource. Then, add new attributes to the subscription resource.

First:

{
    "AcceptedTopic": {
        "Type": "AWS::SNS::Topic",
        "Properties": {
            "DisplayName": {
                "Fn::Join": ["", ["Accepted-", {"Ref": "Env"}]]
            },
            "TopicName": {
                "Fn::Join": ["", ["Accepted-", {"Ref": "Env"}]]
            }
        }
    }
    "AcceptedTopicSubscription": {
        "TopicArn": { "Ref": "AcceptedTopic" },
        "Endpoint": {
            "Fn::GetAtt": ["SomeQueue", "Arn"]
        },
        "Protocol": "Sqs"
    }
}

Then:

{
    ...
    "AcceptedTopicSubscription": {
        "TopicArn": { "Ref": "AcceptedTopic" },
        "Endpoint": {
            "Fn::GetAtt": ["SomeQueue", "Arn"]
        },
        "Protocol": "Sqs",
        "RawMessageDelivery": "true"
    }
}