(aws_s3): Enabling EventBridge notifications on an s3 bucket removes existing notification configuration

[flexelem]

Describe the bug

We have an s3 bucket where its notification configuration is being updated in a different stack. When we set eventBridgeEnabled to true CloudFormation makes a PutBucketNotification call with a payload { "EventBridgeConfiguration": {} } without the current notification configuration. This call overrides the current configuration by removing all the existing configuration setup in a different stack. I wonder if this is a bug or intentionally set to work with this way? If this is not a bug can you please guide with a proper workaround?

Here is a working example;

import * as cdk from 'aws-cdk-lib';
import {
  aws_lambda as lambda,
  aws_s3 as s3,
  aws_s3_notifications as s3n,
  aws_sqs as sqs,
} from 'aws-cdk-lib';
import { Construct } from 'constructs';

export class AppStack extends cdk.Stack {
  readonly bucket: s3.Bucket;
  constructor(scope: Construct, id: string, props?: cdk.StackProps) {
    super(scope, id, props);

    this.bucket = new s3.Bucket(this, 'AwesomeBucket', {
      // eventBridgeEnabled: true, // Enable this after deploying both stacks.
    });
  }
}

export interface OtherStackProps extends cdk.StackProps {
  bucketArn: string,
}

export class OtherStack extends cdk.Stack {
  constructor(scope: Construct, id: string, props: OtherStackProps) {
    super(scope, id, props);

    const bucket = s3.Bucket.fromBucketArn(this, 'ImportedAwesomeBucket', props.bucketArn);
    const queue = new sqs.Queue(this, 'AwesomeQueue', {});

    bucket.addObjectCreatedNotification(new s3n.SqsDestination(queue), {
      prefix: 'test',
      suffix: '.csv',
    });
  }
}

This is the PutBucketConfiguration call made by CloudFormation in the first deployment;

{
    "NotificationConfiguration": {
        "xmlns": "http://s3.amazonaws.com/doc/2006-03-01/",
        "QueueConfiguration": {
            "Filter": {
                "S3Key": {
                    "FilterRule": [
                        {
                            "Value": ".csv",
                            "Name": "suffix"
                        },
                        {
                            "Value": "test",
                            "Name": "prefix"
                        }
                    ]
                }
            },
            "Event": "s3:ObjectCreated:*",
            "Id": "arn:aws:cloudformation:us-east-1:548754742764:stack/OtherStack/038ffb30-edc2-11ee-a7ad-0e3e89454e27--6181785077119797464",
            "Queue": "arn:aws:sqs:us-east-1:548754742764:OtherStack-AwesomeQueue8670EAFF-BpWbPd57UrzC"
        }
    },
    "notification": "",
    "bucketName": "appstack-awesomebucket06a0f33d-zihof6dmqjlo",
    "Host": "appstack-awesomebucket06a0f33d-zihof6dmqjlo.s3.amazonaws.com"
}

And here you can see it doesn't include the existing configuration after we enable EventBridge for the bucket

{
    "NotificationConfiguration": {
        "xmlns": "http://s3.amazonaws.com/doc/2006-03-01/",
        "EventBridgeConfiguration": ""
    },
    "notification": "",
    "bucketName": "appstack-awesomebucket06a0f33d-zihof6dmqjlo",
    "Host": "appstack-awesomebucket06a0f33d-zihof6dmqjlo.s3.amazonaws.com"
}

Thanks

Expected Behavior

CloudFormation should keep the current notification configuration and make a proper PutBucketNotificationConfiguration call to preserve existing configuration.

Current Behavior

Enabling eventBridgeEnabled setting on a s3 bucket causes all existing configuration to be removed when configured with a cross-account fashion.

Reproduction Steps

• Deploy both AppStack and OtherStack without having eventBridgeEnabled property enabled on s3 bucket
• Set eventBridgeEnabled to true and deploy the stacks again.
• Confirm that the last deployment overrides the current notification configured for the SQS queue.

Possible Solution

No response

Additional Information/Context

No response

CDK CLI Version

2.121.1

Framework Version

No response

Node.js Version

v18.15.0

OS

macos

Language

TypeScript

Language Version

No response

Other information

No response

[pahud]

related to #29004

closing in favor of #29004

[github-actions]

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[aws-cdk-automation]

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