Authorize room subscription before replaying its history
A client changes the room ID in its subscribe message and receives a few private timeline entries before the gateway rejects membership. Move authority checks ahead of all history and live delivery.
- Focused work estimate
- 2h + prerequisites
- Priority in the scenario
- High
- Engineering practice
- Authorization · Tenant isolation · WebSocket security
Estimated field mix
- Security60%
- Real-time systems40%
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
The fictional Harbor operations team coordinates synthetic incidents in a shared room. Engineers post status notes and claim response tasks while connections come and go. Scope is one application gateway, a durable room event store, and fixture clients; alert paging and external chat delivery are excluded.
Setup prerequisites
- Room membership and command contracts
- Synthetic incident events and a controllable transport harness
Preceding work
Complete these dependencies, or supply their agreed outputs before taking this ticket.
Acceptance criteria
- Subscription derives tenant and user from the authenticated session.
- Current room membership is checked before replay queries and live listener registration.
- Denied subscriptions leave no active listener or partially delivered room data.
Implementation constraints
- Enforce room scope in repository methods as well as at the transport boundary.
Verification to include
- Subscribe as an authorized synthetic member and inspect permitted replay.
- Request a room in another organization and revoke membership before listener installation; deliver zero room events in both cases.
Deliverables
- Authorized subscription boundary and cross-room denial tests
Rollout and recovery
Require this before private-room pilots; disable subscriptions if membership authority is unavailable.
Value of the work
For the engineer: Practice event identity, ordering, replay, authorization, and bounded backpressure in one understandable system.
For the team: Inspect how an engineer keeps collaborative state trustworthy during failures without relying on optimistic success messages.
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.