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feat(mesh): MeshTransfer schema + fail-closed admit (E3 first code) - #36
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…ow bites Closes a register item: capability-ledger.deny() writes a blocked_by_policy receipt into the ledger, but the sole production caller (the pdf-viewer demo) used isEnabled() at the use-gate. isEnabled reports 'blocked_by_policy' as false and drops silently — a policy refusal indistinguishable from a not-yet-declared capability, which is the entire failure mode the register item names. - Inline CapabilityLedger drifted from the packaged version: it lacked assertEnabled and let enable() take a null policyDecisionRef. Both fixed; the packaged behaviour (enable requires a non-empty pdr, assertEnabled throws on any non-enabled state naming the reason) is now mirrored. - Click handlers use assertEnabled via a gatedClick wrapper; the diagnostic surfaces in feature-output so the refusal is visible instead of dropped. - Buttons stay clickable even when not enabled: the enforcement is at the click site, and letting the click fire is what surfaces the diagnostic. - Added pdf-export capability that is denied by policy, so the deny path is now demonstrated end-to-end alongside pdf-sign (missing_plugin) and pdf-viewer (enabled). Package tests unchanged, 38/38 pass on origin/main head. This PR only touches the demo — the surface most likely to drift because it's a manual copy of the module.
Every cross-device transfer (Handoff/drop/cast/message/sync) is an egress act; admit() grants only on an explicit policy decision + hash-sealed receipt, else refuses fail-closed (data-namespace egress additionally needs a region toleration). Spec: sourceos-spec e3-mesh-transport.md. 9 tests.
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First code for E3 personal mesh transport (campaign gap #3, sourceos-spec#267), spec:
e3-mesh-transport.md.schemas/mesh-transfer.schema.json— theMeshTransfercontract (2020-12): kind ∈ {handoff,drop,cast,message,sync}, purpose fixed toegress, requiredconsent.policyDecisionRef+ hash-sealedreceipt.tools/mesh_transfer.py—admit(), pure/stdlib, fail-closed: grants only on an explicit policy decision + valid receipt; denies missing consent, missing/garbage receipt, non-egress purpose, unknown kind, same-device, non-device endpoints, and data-namespace egress without a region toleration (GDPR Ch. V). Mirrors the shell's Require a policy decision to grant, and give callers a gate that fails closed #31 'gate that bites' convention.tests/test_mesh_transfer.py— 9 tests (allow + every deny path), green.Moves the census Continuity/Handoff/AirDrop + AirPlay rows spec→partial. Next: a
meshdservice that forms the WireGuard fabric and moves a real file drop E2E.