* feat(api): add procurement-api stack - read API + OpenAPI docs page
Third CDK stack: API Gateway REST API (IAM SigV4) over both pipelines'
tables, replacing SHOC's retired SyncController cross-account DynamoDB
scan as the reconciliation/backfill path.
- lambdas/api/: handler (healthcheck + docs-token gate + router dispatch),
router (single route table), pagination (opaque cursor, hostile -> 400),
Decimal-safe serialization, wo_repo/po_repo reads. No VendorReplies.
- OpenAPI 3.1 spec as source of truth incl. top-level webhooks section
documenting the outbound SHOC feed; phase-2 write endpoints x-planned
(router answers 501). Self-contained /docs page, no CDN.
- Auth: AWS_IAM on data routes + resource policy scoped to exactly
arn:aws:iam::396287094661:role/shoc-backend-dev on GET/*; /docs and
/openapi.json carve-out is token-gated in the Lambda via shared
web_ui_auth (fail-closed, INFRA-74 posture).
- KMS: explicit Decrypt/DescribeKey on the DynamoDB CMK from SSM
(name-imported table drops the key association - INFRA-104 class).
- Alarms: errors/throttles/duration(p99>=22.5s) + gateway 5xx, ALARM-only
to site-alerts. No access logging in v1 (docs ?token= shim stays out of
logs); cloud_watch_role=False.
- Tests: handler auth-seam + routing + Decimal round-trip; moto cursor
pagination incl. hostile cursors; spec<->router drift gate; bundle
AST pins for the api command; pytest.ini --cov + loader siblings.
- Deploy role: third stack DescribeStacks ARN + procurement-api smoke
invoke ARN (re-run create-deploy-role.sh before merge).
* harden(api): apply sh-security-review findings to procurement-api
Fan-out (6 detectors) + review findings resolved:
Correctness / DoS:
- pagination: require EXACT key-set match (was subset) so a partial/foreign
composite cursor can't reach DynamoDB as an inconsistent ExclusiveStartKey
-> ValidationException -> 500; comments Query now pins the cursor's
work_order_id to the path entity.
- handler: map botocore ValidationException to 400 (defense in depth) so a
crafted cursor can't drive the zero-threshold 5xx alarm.
- web_ui_auth: compare tokens as bytes; a non-ASCII presented token now fails
closed (401) instead of crashing hmac.compare_digest into a 500. Resolves the
pre-existing xfail(strict) follow-up test; hardens the web UIs too.
Docs page:
- typeStr() now escapes the one spec-derived string that reached innerHTML.
- spec inlined into the docs <script> block escapes "<" -> < (</script>
breakout guard); /openapi.json still served byte-faithful.
- Cache-Control: no-store + Referrer-Policy: no-referrer on docs responses so
the ?token= URL stays out of caches/Referer.
- spec-drift test asserts the committed spec carries no "</" / "<!--".
IAM / IaC:
- resource policy enumerates the 7 data GET resources instead of GET/* so a
future GET route can't silently inherit SHOC cross-account reach.
- kms:Decrypt grant gains a kms:ViaService=dynamodb condition.
- stage throttling (50 rps / 100 burst) bounds the unauthenticated /docs blast
radius below the 10k account default.
- corrected the PATCH/POST comment (same-account callers aren't blocked by the
resource policy; 501 handler + absent write grant are the gate).
- documented the RETAIN log-group first-deploy rollback trap and the
resource-policy-needs-redeploy gotcha in-stack.
Mandatory GPT-4.1 cross-family review of the full policy surface: no BLOCK/FIX.
675 tests pass, ruff clean, cdk synth green.
