[jira] [Created] (HDDS-15259) Ensure PutObjectTagging overwrites existing tags and supports empty tag values

["Gargi Jaiswal (Jira)" <ji...@apache.org>]

Gargi Jaiswal created HDDS-15259:
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             Summary: Ensure PutObjectTagging overwrites existing tags and supports empty tag values
                 Key: HDDS-15259
                 URL: https://issues.apache.org/jira/browse/HDDS-15259
             Project: Apache Ozone
          Issue Type: Sub-task
            Reporter: Gargi Jaiswal
            Assignee: Gargi Jaiswal


This JIRA addresses two core compliance issues in the *object tagging* implementation:
 # *Overwrite vs. Merge:* Currently, tagging operations appear to be merging new tags with existing ones. AWS S3 specification requires that {{PutObjectTagging}} completely replaces the existing tag set with the new one provided in the request. This causes {{test_put_modify_tags on ceph}} to fail.

 # *Empty Value Support:* The S3 Gateway validator currently rejects tags with an empty value string (e.g., {{{}Key=TagA, Value={}}}) with an {{InvalidTag}} error. AWS S3 permits keys to have empty string values. This causes {{test_put_obj_with_tags}} to fail.

*Proposed Fix:* 
1. Update the internal tagging logic to ensure {{*setTags()*}} is called instead of an additive operation, ensuring a full overwrite of the metadata.
2. Update *{{validateAndGetTagging()}}* in {{EndpointBase}} to allow values with zero length, while maintaining the requirement that the Key must have at least one character.



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