Fix PlutusV4 script handling and scrambled ToPlutusScriptPurpose type family#1237
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Pull request overview
This PR corrects Plutus V4 handling across the API by properly mapping ledger PlutusV4 to PlutusScriptV4, implementing V4 script conversion for the Dijkstra era, and fixing a scrambled ToPlutusScriptPurpose type family used by the experimental legacy-script shim.
Changes:
- Fix
fromAlonzoLanguageto mapPlutusV4→PlutusScriptV4and implementtoShelleyScript/fromShelleyBasedScriptsupport for Plutus V4 in Dijkstra. - Remove an unconditional runtime error for V4 datums in experimental witness handling (
getPlutusDatum). - Correct the purpose mapping in
ToPlutusScriptPurpose(Cert/Mint and Voter/Proposal were swapped).
Reviewed changes
Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.
| File | Description |
|---|---|
cardano-api/src/Cardano/Api/Plutus/Internal/Script.hs |
Fixes Plutus V4 version mapping and adds Dijkstra-era V4 script conversion. |
cardano-api/src/Cardano/Api/Experimental/Tx/Internal/AnyWitness.hs |
Enables datum extraction for Plutus V4 instead of erroring. |
cardano-api/src/Cardano/Api/Experimental/Plutus/Internal/Shim/LegacyScripts.hs |
Fixes the ToPlutusScriptPurpose type family mapping for legacy witness conversion. |
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carbolymer
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| ToPlutusScriptPurpose VoterItem = ProposingScript | ||
| ToPlutusScriptPurpose ProposalItem = VotingScript | ||
| ToPlutusScriptPurpose VoterItem = VotingScript | ||
| ToPlutusScriptPurpose ProposalItem = ProposingScript |
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I'm 99% sure that this was not right.
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Jimbo4350
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One comment everything else LGTM
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|
||
| toPlutusScriptDatum | ||
| :: Witnessable TxInItem era | ||
| :: thing ~ TxInItem |
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This is a cosmetic change. Please revert it.
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I don't have a strong opinion about it, but it made me stop here for a moment and think why thing was set to TxInItem. I can revert it.
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| prop_roundtrip_GovernancePollAnswer_CBOR | ||
| ] | ||
| <> [ testProperty | ||
| ("decode only wrapped plutus script " <> show (pretty version) <> " CBOR") |
Jimbo4350
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Jun 24, 2026
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Context
Several PlutusV4/Dijkstra-era bugs in script conversion functions:
fromShelleyBasedScriptmislabelledDijkstraPlutusV4as V3, causing script hash mismatches andMissingScripterrors for V4 reference scriptstoShelleyScriptcrashed witherrorfor V4 scriptsfromAlonzoLanguagemappedPlutusV4toPlutusScriptV3getPlutusDatumcrashed witherrorfor V4 spending scriptsToPlutusScriptPurposetype family hadCertItem/MintItemandVoterItem/ProposalItemswapped (introduced scrambled in Introduce new witness api #763, never caught because only theTxInItembranch is currently evaluated)How to trust this PR
Each fix is mechanical - correcting a wrong constructor or removing an
errorstub.The
ToPlutusScriptPurposefix can be verified by comparing toPlutusScriptForin the same file (always had the correct mapping).All cardano-api tests pass (
nix build .#checks.x86_64-linux.cardano-api:test:cardano-api-test).Checklist
.changes/