Revoke export access when the subject loses the required session
A member signs out all sessions after an account concern, but a previously issued export link remains usable longer than the product policy allows.
- Focused work estimate
- 5h + prerequisites
- Priority in the scenario
- High
- Engineering practice
- Revocation · Security tradeoffs
Estimated field mix
- Security40%
- Privacy engineering40%
- System design20%
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
A fictional learning workspace offers a member a portable copy of their own profile, notes and activity settings. Shared documents contain contributions from other people. The product export policy specifies included fields and shared-record handling; this is an engineering exercise, not a legal portability claim.
Setup prerequisites
- Create synthetic members, private notes and shared-document contributions in a local database.
- Provide fake queue and object-storage adapters with controllable expiry and failure.
Preceding work
Complete these dependencies, or supply their agreed outputs before taking this ticket.
- REXPORT-101 · List exportable member fields before serializing database rows
- REXPORT-102 · Define how shared document contributions appear in a personal export
- REXPORT-103 · Bind export creation to the current authorized subject
- REXPORT-104 · Freeze the export selection without holding a long database transaction
- REXPORT-105 · Stream large note exports with bounded intermediate storage
- REXPORT-106 · Validate the export manifest before marking assembly complete
- REXPORT-107 · Issue a short-lived download capability only after subject authorization
Acceptance criteria
- Define the revocation guarantee and the limits of direct object-store capabilities.
- Choose a bounded retrieval design that meets the stated exercise policy and document its latency/availability tradeoff.
- Prevent new access after revocation and state how an already-started transfer is handled.
Implementation constraints
- Do not promise immediate revocation of an independently valid signed URL without a mechanism that can enforce it.
Verification to include
- Issue access, revoke the session and attempt a new download under the chosen design.
- Revoke during a paused transfer and verify the documented in-flight behavior and resource cleanup.
Deliverables
- Revocation design decision and enforced retrieval tests
Rollout and recovery
Roll out the chosen retrieval path under a new capability version; stop issuing the old form before claiming the new guarantee.
Value of the work
For the engineer: Practice export scoping, consistency, streaming and expiring access without leaking other members’ data.
For the team: Create a reviewable export contract and cross-subject regression suite for an approved product policy.
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.