Incorrect hostname for accesspoint when useDualstackEndpoint is enabled

[trivikr]

Describe the bug

The SDK sets incorrect hostname for Bucket containing accesspoint ARN when useDualstackEndpoint is enabled

Your environment

SDK version number

@aws-sdk/[email protected]

Is the issue in the browser/Node.js/ReactNative?

N/A

Details of the browser/Node.js/ReactNative version

$ node -v
v16.13.0

Steps to reproduce

• Create an access point for a test bucket.
• Run the below example code.

Code

import { S3 } from "@aws-sdk/client-s3";

const region = "us-west-2";
const useDualstackEndpoint = true;

// ARN for the accesspoint
const Bucket =
  "arn:aws:s3:us-west-2:123456789012:accesspoint/trivikr-accesspoint-testing";

const client = new S3({ region, useDualstackEndpoint });
await client.listObjects({ Bucket });

Observed behavior

throws getaddrinfo ENOTFOUND error.

Example output

node:internal/process/esm_loader:94
    internalBinding('errors').triggerUncaughtException(
                              ^

Error: getaddrinfo ENOTFOUND trivikr-accesspoint-testing-123456789012.s3-accesspoint.dualstack.us-west-2.us-west-2.amazonaws.com
    at GetAddrInfoReqWrap.onlookup [as oncomplete] (node:dns:71:26) {
  errno: -3008,
  code: 'ENOTFOUND',
  syscall: 'getaddrinfo',
  hostname: 'trivikr-accesspoint-testing-123456789012.s3-accesspoint.dualstack.us-west-2.us-west-2.amazonaws.com',
  '$metadata': { attempts: 1, totalRetryDelay: 0 }
}

Expected behavior

Sets correct hostname for Bucket containing accesspoint ARN when useDualstackEndpoint is enabled.

Additional context

Probably related to #3001

[trivikr]

For the example provided in the bug, the hostname is

trivikr-accesspoint-testing-123456789012.s3-accesspoint.dualstack.us-west-2.us-west-2.amazonaws.com

It should be:

trivikr-accesspoint-testing-123456789012.s3-accesspoint.dualstack.us-west-2.amazonaws.com

Equivalent AWS CLI code:

$ aws --version
aws-cli/2.2.12 Python/3.8.8 Darwin/20.6.0 exe/x86_64 prompt/off

$ aws configure set default.s3.use_dualstack_endpoint true

$ aws s3api list-objects --bucket arn:aws:s3:us-west-2:123456789012:accesspoint/trivikr-accesspoint-testing --debug 2>&1 | grep "urllib3.connectionpool"
2021-11-08 18:02:01,865 - MainThread - urllib3.connectionpool - DEBUG - Starting new HTTPS connection (1): trivikr-accesspoint-testing-123456789012.s3-accesspoint.us-west-2.amazonaws.com:443
2021-11-08 18:02:01,915 - MainThread - urllib3.connectionpool - DEBUG - https://trivikr-accesspoint-testing-123456789012.s3-accesspoint.us-west-2.amazonaws.com:443 "GET /?encoding-type=url HTTP/1.1" 200 None

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