How to refer arn for an S3 bucket created using cfn resource in cdk python ?

Question

I have created an s3 bucket using CfnBucket construct like below. I am using cfn constructs due to strict requirement.

```
`bucket=s3.CfnBucket(
            self,
            "someId",
            bucket_name="some_name"
)`
```

How to I refer to this bucket's arn in some other construct ? For eg I am trying something like below to refer to this bucket's arn in a firehose stream I am trying to create.

```
kinesisfirehose.CfnDeliveryStream(
            self, "SomeId",
       s3_destination_configuration=kinesisfirehose.CfnDeliveryStream.S3DestinationConfigurationProperty(
                bucket_arn=f"arn:aws:s3:::{ksuite_analytic_bucket}",
            )
        )
)
```
This is not working and I am getting an error that s3 arn is not valid.

What's the correct way of doing this ?

Answer

There's an attribute called ```attr_arn``` that returns the ARN of the bucket. You could simply pass ```bucket.attr_arn``` as a parameter. See the [CDK python documentation about the attribute](https://docs.aws.amazon.com/cdk/api/v1/python/aws_cdk.aws_s3/CfnBucket.html#aws_cdk.aws_s3.CfnBucket.attr_arn).

How to refer arn for an S3 bucket created using cfn resource in cdk python ?

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