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| 1 | +-- SPDX-License-Identifier: MPL-2.0 |
| 2 | +-- Copyright (c) 2026 Jonathan D.A. Jewell (hyperpolymath) <j.d.a.jewell@open.ac.uk> |
| 3 | +-- |
| 4 | +||| Layer 5 — the ABI SOUNDNESS CERTIFICATE for Wokelangiser. |
| 5 | +||| |
| 6 | +||| This module proves NOTHING new about the domain. Its sole job is to ASSEMBLE |
| 7 | +||| the four prior proof layers into ONE inhabited value, so that the full ABI |
| 8 | +||| contract is demonstrably discharged *together*. The certificate ties: |
| 9 | +||| |
| 10 | +||| * the manifest (consent + accessibility intent) -> |
| 11 | +||| * the Layer-2 flagship semantic property |
| 12 | +||| (`Semantics.processPermitted` : a data action is `Permitted` only with |
| 13 | +||| Active recorded consent — the canonical positive control) -> |
| 14 | +||| * the Layer-3 deeper invariant |
| 15 | +||| (`Invariants.processNotPermittedAfterRevoke` : revocation monotonicity — |
| 16 | +||| once consent is withdrawn the same action can never be `Permitted`, |
| 17 | +||| even over a prior Active grant) -> |
| 18 | +||| * the Layer-4 FFI-seam soundness |
| 19 | +||| (`FfiSeam.resultToIntInjective` : distinct ABI outcomes never collide on |
| 20 | +||| the wire crossing into C) |
| 21 | +||| |
| 22 | +||| into a single end-to-end soundness statement. The record `ABISound` has one |
| 23 | +||| field per layer; `abiContractDischarged : ABISound` is the capstone witness. |
| 24 | +||| Crucially, this value can ONLY typecheck if every reused theorem is itself |
| 25 | +||| sound: if any prior layer were broken, this value would not exist. There is |
| 26 | +||| no `believe_me`, `postulate`, `assert_total`, `idris_crash`, `%hint` or any |
| 27 | +||| other escape hatch anywhere in the chain — it is genuine composition. |
| 28 | + |
| 29 | +module Wokelangiser.ABI.Capstone |
| 30 | + |
| 31 | +import Wokelangiser.ABI.Types |
| 32 | +import Wokelangiser.ABI.Semantics |
| 33 | +import Wokelangiser.ABI.Invariants |
| 34 | +import Wokelangiser.ABI.FfiSeam |
| 35 | + |
| 36 | +%default total |
| 37 | + |
| 38 | +-------------------------------------------------------------------------------- |
| 39 | +-- The ABI soundness certificate |
| 40 | +-------------------------------------------------------------------------------- |
| 41 | + |
| 42 | +||| `ABISound` is the end-to-end certificate type. Each field is a KEY proven |
| 43 | +||| fact of this ABI, taken verbatim from the layer that established it: |
| 44 | +||| |
| 45 | +||| * `flagship` — Layer 2: the canonical positive control showing that a |
| 46 | +||| data action (`Process`) IS `Permitted` exactly when the |
| 47 | +||| consent ledger records `Active` consent for it. |
| 48 | +||| * `invariant` — Layer 3: revocation monotonicity at the concrete override |
| 49 | +||| case — after withdrawing consent for `Process` (which was |
| 50 | +||| previously Active), it is NOT `Permitted`. |
| 51 | +||| * `seamSound` — Layer 4: the FFI result encoding is injective, so distinct |
| 52 | +||| ABI outcomes never alias on the C wire. |
| 53 | +||| |
| 54 | +||| Inhabiting this record is the act of certifying the whole contract at once. |
| 55 | +public export |
| 56 | +record ABISound where |
| 57 | + constructor MkABISound |
| 58 | + ||| Layer-2 flagship semantic property (positive control witness). |
| 59 | + flagship : Permitted Semantics.sampleLedger Process |
| 60 | + ||| Layer-3 deeper invariant (revocation monotonicity, override case). |
| 61 | + invariant : Not (Permitted (revoke Process Invariants.priorLedger) Process) |
| 62 | + ||| Layer-4 FFI-seam injectivity (no outcome collisions on the wire). |
| 63 | + seamSound : (a, b : Result) -> resultToInt a = resultToInt b -> a = b |
| 64 | + |
| 65 | +-------------------------------------------------------------------------------- |
| 66 | +-- The capstone: a single inhabited value built from the real theorems |
| 67 | +-------------------------------------------------------------------------------- |
| 68 | + |
| 69 | +||| THE CAPSTONE. One inhabited value of `ABISound`, constructed purely from the |
| 70 | +||| already-exported witnesses of the prior layers. Its mere existence is the |
| 71 | +||| end-to-end soundness claim: manifest -> flagship -> invariant -> FFI seam, |
| 72 | +||| all discharged simultaneously. Were any reused theorem unsound, this binding |
| 73 | +||| would fail to typecheck. |
| 74 | +public export |
| 75 | +abiContractDischarged : ABISound |
| 76 | +abiContractDischarged = |
| 77 | + MkABISound |
| 78 | + processPermitted -- Layer 2 (Semantics) |
| 79 | + processNotPermittedAfterRevoke -- Layer 3 (Invariants) |
| 80 | + resultToIntInjective -- Layer 4 (FfiSeam) |
| 81 | + |
| 82 | +-------------------------------------------------------------------------------- |
| 83 | +-- Field-level accessors as named theorems (so each layer is recoverable) |
| 84 | +-------------------------------------------------------------------------------- |
| 85 | + |
| 86 | +||| Recover the Layer-2 flagship fact from the certificate. |
| 87 | +public export |
| 88 | +certFlagship : Permitted Semantics.sampleLedger Process |
| 89 | +certFlagship = abiContractDischarged.flagship |
| 90 | + |
| 91 | +||| Recover the Layer-3 invariant from the certificate. |
| 92 | +public export |
| 93 | +certInvariant : Not (Permitted (revoke Process Invariants.priorLedger) Process) |
| 94 | +certInvariant = abiContractDischarged.invariant |
| 95 | + |
| 96 | +||| Recover the Layer-4 FFI-seam injectivity from the certificate. |
| 97 | +public export |
| 98 | +certSeamSound : (a, b : Result) -> resultToInt a = resultToInt b -> a = b |
| 99 | +certSeamSound = abiContractDischarged.seamSound |
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