Move conditional header evaluation (If-Match, If-None-Match, etc.) to
after the version resolution step in GetObjectAttributesHandler. This
ensures that when a specific versionId is requested, conditions are
checked against the correct version entry rather than always against
the latest version.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Checksum is accepted in validation (so clients requesting it don't get
a 400 error, matching AWS behavior for objects without checksums) but
SeaweedFS does not yet store S3 checksums. Add a comment explaining
this and noting where to populate it when checksum storage is added.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Add GetObjectAttributesHandler that returns selected object metadata
(ETag, Checksum, StorageClass, ObjectSize, ObjectParts) without
returning the object body. Follows the same versioning and conditional
header patterns as HeadObjectHandler.
The handler parses the X-Amz-Object-Attributes header to determine
which attributes to include in the XML response, and supports
ObjectParts pagination via X-Amz-Max-Parts and X-Amz-Part-Number-Marker.
Ref: https://docs.aws.amazon.com/AmazonS3/latest/API/API_GetObjectAttributes.html
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
