Validate presence room identifiers before subscribing
Malformed room names reach the broker and create unbounded keys. Parse a bounded typed room identifier.
- Focused work estimate
- 1h 15m + prerequisites
- Priority in the scenario
- High
- Engineering practice
- Input validation · Pub-sub
Estimated field mix
- Security50%
- Real-time systems50%
Field percentages are editorial estimates of the ticket's engineering focus. They total 100%; they are not measured time, proficiency scores, or ownership evidence.
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Project context
Fictional document team Pine shows collaboration presence for synthetic accounts. Build a loopback WebSocket server and injected clocks; no message content or activity surveillance is required.
Setup prerequisites
- Create synthetic memberships and session identifiers.
- Implement controllable sockets and an in-memory TTL adapter.
Preceding work
No earlier ticket is required. Complete the project setup above.
Acceptance criteria
- Valid room IDs subscribe
- Malformed IDs fail before broker access
- Error omits raw oversized input
Implementation constraints
- Room parsing does not replace membership checks.
Verification to include
- Subscribe valid fixture room
- Send oversized room identifier
Deliverables
- Room parser and rejection tests
Rollout and recovery
Reject new subscriptions if parsing fails.
Value of the work
For the engineer: Practice ephemeral state, ordering and reconnect semantics.
For the team: Inspect whether online indicators avoid stale or unauthorized claims.
Evidence boundaries
Outcome Evidence: Tests, patches, and runbooks are requested deliverables. They become Outcome Evidence only through a qualified Mission and immutable Evidence IDs.
Ownership Evidence: Independent adaptation must be observed under a declared verification policy and cite immutable Evidence IDs. Completing a planning ticket establishes no Ownership Evidence.