Gargi Jaiswal created HDDS-16072:
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             Summary: Implement GetObjectAttributes: ETag, ObjectSize, 
StorageClass, and ObjectParts count
                 Key: HDDS-16072
                 URL: https://issues.apache.org/jira/browse/HDDS-16072
             Project: Apache Ozone
          Issue Type: Sub-task
            Reporter: Gargi Jaiswal
            Assignee: Gargi Jaiswal


Implement the initial GetObjectAttributes support in the S3 Gateway.

Changes required:
 * API : GET /\{bucket}/\{key}?attributes
 * Required header: x-amz-object-attributes
 * Supported attributes:
 ** ETag — object ETag (MD5 or composite hash for multipart objects)
 ** ObjectSize — object size in bytes
 ** StorageClass — storage/replication class
 ** ObjectParts — for multipart objects,
 * Response format: XML GetObjectAttributesResponse with Last-Modified response 
header
 * Error handling: 404 NoSuchKey when the object does not exist, 403 
AccessDenied on authorization failure, 400 InvalidArgument when the attributes 
header is missing or invalid
 * Audit and metrics: GET_OBJECT_ATTRIBUTES audit action and success/failure 
metrics



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