Set up a SQS queue to receive notifications from an SNS topic located in another AWS account by using AWS CDK in TypeScript

Looking to establish a connection between an SQS queue and an SNS topic located in a different account using CDK (TypeScript). Presented below is the code snippet (contained within a stack) that I believe should facilitate this integration. However, I have a few concerns highlighted beneath the code (I haven't deployed this yet as I'm still exploring the process).

    const topic = Topic.fromTopicArn(
      this,
      `${stackName}-topic`,
      `arn:aws:sns:${region}:${accountno}:SubscriptionChanges`
    );

    topic.addSubscription(
      new SqsSubscription(queue, {
        filterPolicy: {
          type: SubscriptionFilter.stringFilter({
            whitelist: [
              'filter1',
            ],
          })
        },
      })
    );
  }
  • Is it permissible to use fromTopicArn to instantiate the topic construct when I am not the owner of the topic (since the topic exists in a different account requiring cross-account setup)?
  • Can a SQS subscription be created without declaring the topic variable as shown in the first line above?

Reviewing the official documentation, I observed code examples demonstrating similar setups but limited to interactions within the same AWS account. Seeking insights from individuals with practical experience regarding this scenario.

typescriptamazon-web-servicesamazon-sqsamazon-snsaws-cdk

Answer №1

After conducting thorough research, I have gathered some valuable information.

It is possible to create a topic construct even without owning the topic, and you can link a queue to it. However, access must be granted by the topic owner (specifically, your account number).

const queue = createQueue();
const topic = sns.Topic.fromTopicArn(
  this, // assuming `this` refers to your Deployment Stack object.
  "myTopicId",
  "arn:aws:sns:eu-west-1:123123123123:MyFriendsGreatSnsTopic");

topic.addSubscription(new snsSubs.SqsSubscription(queue, {
   rawMessageDelivery: true // set to false if desired
}));

Answer №2

Below is a method to assign topic ownership for accessing an account

        Use the code snippet below to grant permission for subscribing to a topic:
        topic.addToResourcePolicy(new PolicyStatement({
            sid: "Allow Access to subscribe",
            effect: Effect.ALLOW,
            principals: [new AccountPrincipal(<***>)],
            actions: [
                "SNS:Subscribe"
            ],
            resources: [
                topic.topicArn
            ]
        }))

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