ListObjectVersions and ListMultipartUploads paginators send 0 for max items when input is nil

[ewbankkit]

Describe the bug

My specific problem is to do with the S3 API's ListObjectVersionsInput.MaxKeys field, but the underlying cause may affect other APIs.

The recent (/~https://github.com/aws/aws-sdk-go-v2/releases/tag/release-2023-11-17) change to default value serialization, #2162, has caused the S3 ListObjectVersions API to return no object versions when no value (now nil) is specified for ListObjectVersionsInput.MaxKeys.
Previously (/~https://github.com/aws/aws-sdk-go-v2/releases/tag/release-2023-11-16) up to 1000 object versions were returned when no value was specified, as documented in the API Reference:

Sets the maximum number of keys returned in the response. By default, the action returns up to 1,000 key names.

Sniffing the HTTP request I can now see an explicit max-keys=0 URL query parameter added.

Expected Behavior

If no value for ListObjectVersionsInput.MaxKeys is specified, up to 1000 object version should be returned.

Current Behavior

See above.

Reproduction Steps

input := &s3.ListObjectVersionsInput{
	Bucket:  aws.String("tf-acc-test-7828939106372858870"),
}

pages := s3.NewListObjectVersionsPaginator(conn, input)
for pages.HasMorePages() {
	page, err := pages.NextPage(ctx)

	if err != nil {
		return err
	}

	for _, objectVersion := range page.Versions {
	}
}

leads to

http.url="https://tf-acc-test-7828939106372858870.s3.us-west-2.amazonaws.com/?max-keys=0&versions="
http.response.body=
| <?xml version="1.0" encoding="UTF-8"?>
| <ListVersionsResult xmlns="http://s3.amazonaws.com/doc/2006-03-01/"><Name>tf-acc-test-7828939106372858870</Name><KeyMarker></KeyMarker><VersionIdMarker></VersionIdMarker><MaxKeys>0</MaxKeys><IsTruncated>false</IsTruncated></ListVersionsResult>

Possible Solution

No response

Additional Information/Context

Workaround is to add an explicit default value:

input := &s3.ListObjectVersionsInput{
	Bucket:  aws.String("tf-acc-test-7828939106372858870"),
	MaxKeys: aws.Int32(1000),
}

AWS Go SDK V2 Module Versions Used

% grep s3 go.mod 
	github.com/aws/aws-sdk-go-v2/feature/s3/manager v1.14.0
	github.com/aws/aws-sdk-go-v2/service/s3 v1.43.0
	github.com/aws/aws-sdk-go-v2/service/s3control v1.37.0
	github.com/aws/aws-sdk-go-v2/service/internal/s3shared v1.16.3 // indirect

Compiler and Version used

go version go1.20.10 darwin/amd64

Operating System and version

macOS Ventura 13.6

[lucix-aws]

The handwritten paginator for ListObjectVersions was updated incorrectly as part of this change. Will work on a fix immediately.

change to default value serialization

As an aside, the behavior of default value serialization in the SDK itself was not changed. The service model was updated in a way that causes us to instead generate the affected fields like this as *type instead of the value variant.

[lucix-aws]

Linked PR will correct this behavior.

Note that explicit use of ListObjectVersions / ListMultipartUploads is unaffected.

[github-actions]

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