Fix HeadObject OpenAPI summary and align base64 key decoding

[G4brym]

Summary

• Fixes the OpenAPI summary field in HeadObject from "Get Object" to "Head Object" — this was a copy-paste error that shows up in generated API documentation
• Aligns the base64 key decoding logic in HeadObject and PutMetadata with GetObject's three-level try-catch fallback

Why

GetObject has three levels of fallback for decoding base64-encoded file keys (to handle various URL encoding edge cases), but HeadObject and PutMetadata — which receive keys the same way via URL params — only had two levels. This inconsistency means certain encoded file keys could successfully download via GetObject but fail when fetching metadata via HeadObject or updating metadata via PutMetadata.

What changed

• packages/worker/src/modules/buckets/headObject.ts: Fixed summary, added third fallback level for key decoding
• packages/worker/src/modules/buckets/putMetadata.ts: Added third fallback level for key decoding

Test plan

• All 78 existing tests pass (7 skipped — same as baseline)
• Linter passes with no issues

🤖 Generated with Claude Code

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Status	Name	Latest Commit	Preview URL	Updated (UTC)
✅ Deployment successful! View logs	r2-explorer-docs	25c7968	Commit Preview URL Branch Preview URL	Mar 07 2026, 09:46 PM

[G4brym]

Automated Code Review — APPROVED ✅

Review Scores: 5/5 reviewers approved

Summary

Clean, well-scoped PR that fixes a copy-paste error in the HeadObject OpenAPI summary and aligns base64 key decoding fallback logic in HeadObject and PutMetadata with the existing three-level pattern in GetObject. All changes are straightforward and correct.

Review Perspectives

1. Correctness: ✅ Summary fix is correct; decoding fallback now exactly matches GetObject reference implementation
2. Security: ✅ No new attack surface — same decoding logic already shipped in GetObject
3. Performance: ✅ One additional try-catch level is negligible overhead
4. Code Quality: ✅ Aligns with existing patterns; catch (e) → catch removes unused variable
5. Testing: ✅ All 78 tests pass, linter clean

Minor Suggestions (non-blocking)

• Code duplication: The base64 key decoding logic is now identical in getObject.ts, headObject.ts, and putMetadata.ts. Consider extracting a shared decodeKey(key: string): string utility to prevent future drift.
• Test coverage: No dedicated test for the third fallback level (though this also applies to GetObject — could be a follow-up).

🤖 Automated review by prodboard