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feat: implement token source, key store, verifier, snapshot client and event receiver - #1
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…d event receiver Replaces the scaffolded stubs with the RFC v3 §5, §6 and §14.1 implementations: - serviceTokenSource: client credentials with private_key_jwt, cached, renewed in the background at half the lifetime, with failure backoff and timeouts. - createKeyStore: last-known-good JWKS with persistence, a 24 h maximum age and the contract's unknown-kid refetch rules. - verifyAccessToken / resolveActor: the §6.4 checks and X-PN-Actor handling. - accessSnapshot: ETag polling, single-flight refresh with one queued follow-up, validation before swap, persistence and MAX_STALE. - createAccessEventHandler: SET receiver with a bounded body. The not_implemented error code, used only by the stubs, is removed.
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Included review availability: This review used your included allowance. Your plan provides up to 1 included review per hour; 0 remain after this review. WalkthroughThe pull request implements service-token issuance, JWKS caching, access-token verification, actor resolution, snapshot access, and access-event handling. It adds public defaults, error handling, and tests for these flows. ChangesAuthentication and access snapshots
Sequence Diagram(s)sequenceDiagram
participant EventClient
participant createAccessEventHandler
participant verifyAccessToken
participant createKeyStore
participant accessSnapshot
EventClient->>createAccessEventHandler: POST signed event
createAccessEventHandler->>verifyAccessToken: verify event token
verifyAccessToken->>createKeyStore: resolve signing key
createKeyStore-->>verifyAccessToken: return signing key
verifyAccessToken-->>createAccessEventHandler: return verified claims
createAccessEventHandler->>accessSnapshot: refresh snapshot
accessSnapshot-->>createAccessEventHandler: return refresh result
createAccessEventHandler-->>EventClient: return HTTP response
Priority: ➖ Normal Change: Feature Merge Risk: ⚪ Minimal · up to No actionable issue remains in the reviewed changes; the PR is mergeable after normal checks. Pre-merge checks |
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| Check name | Status | Explanation | Resolution |
|---|---|---|---|
| Docstring Coverage |  |
Docstring coverage is 35.90% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 39 functions across 13 files. | Write docstrings for the functions missing them to satisfy the coverage threshold. |
✅ Passed checks (3 passed)
| Check name | Status | Explanation |
|---|---|---|
| Title check |  |
The title clearly summarizes the main change by identifying the implementation of the token source, key store, verifier, snapshot client, and event receiver. |
| Linked Issues check | |
Check skipped because no linked issues were found for this pull request. |
| Out of Scope Changes check | |
Check skipped because no linked issues were found for this pull request. |
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Inline comments:
Review comments at @src/snapshot/client.ts:
- Around line 105-109: Update the 304 response branch to require both an
existing snapshot and its ETag before updating lastSyncAt or persisting. Reject
304 responses when state.etag is absent, since the request was unconditional.
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📒 Files selected for processing (14)
README.mdsrc/errors.tssrc/index.tssrc/key-store.tssrc/snapshot/client.tssrc/snapshot/events.tssrc/token-source.tssrc/verify.tstests/events.test.tstests/idp.tstests/key-store.test.tstests/snapshot-client.test.tstests/token-source.test.tstests/verify.test.ts
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Implements the modules that were scaffolded as stubs, so the backend can start Phase 3 of the IdP–Telegram migration (RFC v3 §5, §6, §14.1; behavior per
docs/contract.md).Modules
serviceTokenSource: client credentials with aprivate_key_jwtassertion and exactly oneresource.createKeyStore: last-known-good JWKS.kid: refetches immediately for a token issued since the last fetch started (compared at second resolution, contract §4), otherwise at most once per 30 s. An unknownkidalways fails closed.verifyAccessToken/resolveActor: the §6.4 checks.typ: at+jwt, EdDSA only, the required claims includingjtiandpn_subject_type, 30 s clock tolerance and a 2 h maximum age.pn_subject_typemust agree withsubandclient_id.keys_unavailable, nottoken_invalid, so servers can answer 503.X-PN-Actor; anything else, including an empty or malformed header, isactor_forbidden.accessSnapshot:401the token is renewed and the pull retried once.lastSyncAtare stored, and a snapshot dated in the future is ignored.MAX_STALE: measured from the last200/304only. Past it,has()and the decision lookups deny;current()still serves non-decision lookups.createAccessEventHandler:typ: secevent+jwt, issuer, audience, event URI, projection) and never deduplicates byjti.Content-Length.Breaking change
The
not_implementederror code is removed; only the stubs used it.snapshot_unavailableis added.Release note
npm already has
1.0.0, so the next release from thisfeat:commit is1.1.0, not the0.xthatdocs/releasing.mddescribes.Verification
pnpm test) and Bun (pnpm test:bun);pnpm typecheck,pnpm checkandpnpm buildpass.