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stack/docs/scratchpads/462-fed-m3-06-get-verb.md
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feat(#462): add federation get verb (#683)
FED-M3-06 get verb. Trust boundary mirrors M3-05 AND-intersect (note returned only when owned by subject AND on an authorized mission). Reviewed (review-of-record APPROVE, head 80a259b2) + green PR-event CI 1620.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
2026-06-25 03:44:54 +00:00

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# Scratchpad — FED-M3-06 get verb
## Objective
Implement `POST /api/federation/v1/get/:resource/:id` for M3 inbound federation reads.
## Scope
- `apps/gateway/src/federation/server/verbs/get.controller.ts`
- `apps/gateway/src/federation/server/verbs/get-query.service.ts`
- Unit coverage for controller pipeline + query service RBAC guardrails
- Register controller/service in `FederationModule`
## Plan
1. Mirror the list verb pipeline: `FederationAuthGuard``FederationScopeService` → read-only query service.
2. Return one `_source: "local"` tagged item on success.
3. Return federation error envelopes:
- `404 not_found` when the resource id does not exist.
- `403 scope_violation` when the row exists but falls outside native RBAC/scope intersection.
- `400 invalid_request` for malformed ids/scope requests.
4. Keep read audit persistence deferred to M4; no body or response persistence in M3.
## Verification Evidence
- Rebased onto `origin/main` at `86e106fcc9a1dfa3a18f7846bb477be128794aad` after M3-05 merged; resolved `FederationModule` by registering both list and get verb controllers/services.
- Review-change coverage added for comment 15971:
- get note access now requires subject ownership AND authorized mission intersection.
- missing federation context returns structured `401 unauthorized` envelope.
- unsupported get resources fail closed with structured denial.
- PGlite regressions cover cross-user note exclusion and subject-note unauthorized-mission exclusion.
- `pnpm --filter @mosaicstack/gateway test -- src/federation/server/verbs/__tests__/get.controller.spec.ts src/federation/server/verbs/__tests__/get-query.service.spec.ts` — pass (2 files / 17 tests; re-run after review changes).
- `pnpm --filter @mosaicstack/gateway build` — pass (re-run after review changes).
- `pnpm build` — pass (23 successful tasks before review changes).
- `pnpm typecheck` — pass (41 successful tasks; re-run after review changes).
- `pnpm lint` — pass (23 successful tasks; re-run after review changes).
- `pnpm format:check` — pass (re-run after review changes).
- `~/.config/mosaic/tools/codex/codex-code-review.sh --uncommitted` — approve, 0 findings after review changes.