fix(event-ledger): exclude /info from CORS preflight handling

[priyaselvaganesan]

TL;DR

OPTIONS /info on event-ledger returned 204 instead of 405 because the global CORS preflight middleware intercepted every OPTIONS request, including /info, before it reached the version handler's GET-only enforcement. This scopes the CORS preflight short-circuit to skip /info.

Additional Details

/info is a build-metadata endpoint, not browser-facing, so it doesn't need CORS preflight handling. The version handler's GET-only check (r.Method != http.MethodGet) already covers OPTIONS the same as every other non-GET method. CORS was just intercepting the request before it got there.

All other event-ledger routes keep their existing CORS behavior unchanged.

Added a regression test that wires EnableCORS the same way runService does. The existing test only exercised a bare router without the production middleware chain, which is why this slipped through.

Testing

• go test ./... (event-ledger module) passes.
• go build ./... and go vet ./... are clean.
• Manual end-to-end test against a real httptest.Server confirms OPTIONS /info returns 405 with Allow: GET.
• Ran the service locally against the real Cassandra backend in the local k3d cluster:
  • GET /info returns 200
  • OPTIONS /info returns 405 with Allow: GET
  • POST /info still returns 405
  • GET /health is unaffected
  • OPTIONS on a real API route (/v3/ledger/namespace/example/events) still returns 204 with CORS headers

References

Relates to #315

Summary by CodeRabbit

• Bug Fixes

  • Corrected /info method handling so unsupported requests return 405 with Allow: GET and an empty response body.
  • Ensured CORS processing does not override endpoint-specific validation for /info.
  • Preserved standard CORS preflight behavior for other routes.

• Tests

  • Added coverage for /info requests with CORS enabled, including OPTIONS, GET, and POST scenarios.
  • Added verification that regular routes continue to handle CORS preflight requests correctly.

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Reviewing files that changed from the base of the PR and between eb980df and d185ed1.

📒 Files selected for processing (1)

• src/control-plane-services/event-ledger/cmd/api/startup/info_test.go

🚧 Files skipped from review as they are similar to previous changes (1)

• src/control-plane-services/event-ledger/cmd/api/startup/info_test.go

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📝 Walkthrough

Walkthrough

The CORS middleware now bypasses /info so endpoint method validation handles all methods. Ordinary routes retain preflight handling. Tests cover both behaviors and /info rejection responses with CORS enabled.

Changes

CORS and /info behavior

Layer / File(s)	Summary
Middleware path handling src/control-plane-services/event-ledger/internal/middleware/cors.go, src/control-plane-services/event-ledger/internal/middleware/cors_test.go	EnableCORS forwards /info requests without CORS interception. Tests retain ordinary-route preflight coverage and verify /info handling for OPTIONS, GET, and POST.
/info method validation src/control-plane-services/event-ledger/cmd/api/startup/info_test.go	The tests include OPTIONS among rejected methods and verify 405, Allow: GET, and an empty body with CORS middleware enabled.

Estimated code review effort: 2 (Simple) | ~10 minutes

Merge Risk: ⚪ Minimal · up to d185e

This narrowly scopes CORS preflight handling so /info preserves its GET-only behavior while other routes retain existing behavior; no actionable merge-blocking risk remains after normal checks and review.

Suggested reviewers: borao, nvaghela-oss, shelleyshen-0

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title follows Conventional Commits format with the required scope. The fix type accurately describes the correction to /info CORS preflight handling.
Docstring Coverage	✅ Passed	Docstring coverage is 80.00% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 5 functions across 3 files.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

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• Create PR with unit tests
• Commit unit tests in branch fix/event-ledger-info-options-405

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[coderabbitai]

Actionable comments posted: 1

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Inline comments:
In `@src/control-plane-services/event-ledger/cmd/api/startup/info_test.go`:
- Around line 105-111: Update the comment for
TestRegisterUnauthenticatedRoutes_Info_RejectsNonGET_WithCORSMiddleware to
remove the private bug identifier and internal staging/debugging details, while
retaining a concise external-facing explanation that the test prevents CORS
preflight middleware from bypassing the handler’s expected 405 response for
OPTIONS /info.

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Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

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Configuration used: Path: .coderabbit.yaml

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📥 Commits

Reviewing files that changed from the base of the PR and between f8b622d and eb980df.

📒 Files selected for processing (3)

• src/control-plane-services/event-ledger/cmd/api/startup/info_test.go
• src/control-plane-services/event-ledger/internal/middleware/cors.go
• src/control-plane-services/event-ledger/internal/middleware/cors_test.go

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[shelleyshen-0]

LGTM