CLDSRV-908: CopyObject handle checksums

[leif-scality]

• Forward a src object checksum to the dest object
• Recompute the checksum when required (x-amz-checksum-algorithm header set, src object MPU with COMPOSITE checksum, ...)

[bert-e]

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[bert-e]

Incorrect fix version

The Fix Version/s in issue CLDSRV-908 contains:

• None

Considering where you are trying to merge, I ignored possible hotfix versions and I expected to find:

• 9.4.0

Please check the Fix Version/s of CLDSRV-908, or the target
branch of this pull request.

[claude]

This require() is inside the withV4 callback / describe block. Per project conventions, require() calls should be at the top of the file, not inside describe or functions.

— Claude Code

[claude]

LGTM — clean implementation of checksum propagation and recompute on CopyObject. Stream handling (jsutil.once guards, Azure per-part passthrough, error propagation) and the _shouldRecomputeChecksum decision logic are solid. One minor test style issue flagged inline.

- require() inside describe/withV4 callback in functional test — move to top of file

Review by Claude Code

[codecov]

Codecov Report

❌ Patch coverage is 73.26733% with 27 lines in your changes missing coverage. Please review.
✅ Project coverage is 85.24%. Comparing base (538c16c) to head (5ca489a).
⚠️ Report is 7 commits behind head on development/9.4.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
lib/api/objectCopy.js	70.65%	27 Missing ⚠️

Additional details and impacted files

Files with missing lines	Coverage Δ
lib/api/apiUtils/integrity/validateChecksums.js	99.08% <100.00%> (+0.03%)	⬆️
lib/api/objectCopy.js	87.27% <70.65%> (-4.23%)	⬇️

@@                 Coverage Diff                 @@
##           development/9.4    #6176      +/-   ##
===================================================
- Coverage            85.29%   85.24%   -0.06%     
===================================================
  Files                  208      208              
  Lines                13917    14009      +92     
===================================================
+ Hits                 11871    11942      +71     
- Misses                2046     2067      +21     

Flag	Coverage Δ
file-ft-tests	68.87% <73.26%> (+0.05%)	⬆️
kmip-ft-tests	28.10% <22.77%> (-0.03%)	⬇️
mongo-v0-ft-tests	70.07% <73.26%> (+0.11%)	⬆️
mongo-v1-ft-tests	70.09% <73.26%> (+0.06%)	⬆️
multiple-backend	36.39% <5.94%> (-0.21%)	⬇️
sur-tests	35.29% <10.89%> (-1.08%)	⬇️
sur-tests-inflights	37.18% <10.89%> (-0.20%)	⬇️
utapi-v2-tests	34.52% <22.77%> (-0.25%)	⬇️

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