key_cache: Mutex<HashMap<AppId, Vec<u8>>> was populated on first read
and never evicted, bounded, or cleared on app deletion. Two problems:
(1) Once key rotation lands, every running process keeps accepting
tokens signed by the old key until restart.
(2) Dropping and re-creating an app (FK CASCADE removes app_secrets,
fresh row inserted) made the cache hand out the OLD key bytes.
- Wrap the cache value as `(Instant, Vec<u8>)`; entries expire after
KEY_CACHE_TTL = 5min.
- Stale reads fall through to the secrets repo (no error, just slower).
- New `invalidate_signing_key(app_id)` for explicit eviction once the
app-secrets rotation path lands.
AUDIT.md anchor: F-S-008.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Migration 0033 widens topics.auth_mode CHECK to include 'session'
alongside 'public' and 'token'.
TopicAuthMode enum gains a Session variant (as_str + from_db
extended uniformly).
RealtimeAuthorityImpl now takes Arc<dyn UsersService> as a third
constructor arg. The Session branch of authorize_subscribe
delegates to UsersService::verify_session_for_realtime(app_id,
token):
* Returns Some(user) → allow. The service bumps the sliding TTL
on success.
* Returns None → Unauthorized.
* Defense-in-depth: even though verify_session_for_realtime
already enforces cross-app isolation, the branch re-checks
user.app_id == app_id.
Tests added (4 new cases): valid session token allows; missing
token is Unauthorized; wrong token is Unauthorized; cross-app
session token is Unauthorized. All 12 realtime_authority tests
pass.
Dashboard: TopicAuthMode TypeScript union widened to include
'session'; the topic create + edit forms gain a third radio option
labeled "session — requires a per-app user session minted by
users::login (v1.1.8)".
picloud binary: construction order reshuffled so users is built
before realtime_authority. app_secrets_repo is now .clone()'d into
the pubsub realtime wiring so the original Arc can be re-used by
realtime_authority.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
