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lnwallet: for PsbtIntent return the internal key in the POutput

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We also add a new assertion to the itests to ensure the field is being properly set.
This commit is contained in:
Olaoluwa Osuntokun 2024-04-16 16:25:57 -07:00 committed by Oliver Gugger
parent 0a7139c9ca
commit 39b1080166
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GPG Key ID: 8E4256593F177720
2 changed files with 25 additions and 1 deletions
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11
itest/lnd_psbt_test.go
View File

@ -177,6 +177,17 @@ func runPsbtChanFunding(ht *lntest.HarnessTest, carol, dave *node.HarnessNode,
},
)
// If this is a taproot channel, then we'll decode the PSBT to assert
// that an internal key is included.
if commitType == lnrpc.CommitmentType_SIMPLE_TAPROOT {
decodedPSBT, err := psbt.NewFromRawBytes(
bytes.NewReader(tempPsbt), false,
)
require.NoError(ht, err)
require.Len(ht, decodedPSBT.Outputs[0].TaprootInternalKey, 32)
}
// Let's add a second channel to the batch. This time between Carol and
// Alice. We will publish the batch TX once this channel funding is
// complete.

15
lnwallet/chanfunding/psbt_assembler.go
View File

@ -6,11 +6,13 @@ import (
"sync"
"github.com/btcsuite/btcd/btcec/v2"
"github.com/btcsuite/btcd/btcec/v2/schnorr"
"github.com/btcsuite/btcd/btcutil"
"github.com/btcsuite/btcd/btcutil/psbt"
"github.com/btcsuite/btcd/chaincfg"
"github.com/btcsuite/btcd/txscript"
"github.com/btcsuite/btcd/wire"
"github.com/lightningnetwork/lnd/fn"
"github.com/lightningnetwork/lnd/input"
"github.com/lightningnetwork/lnd/keychain"
)
@ -208,7 +210,18 @@ func (i *PsbtIntent) FundingParams() (btcutil.Address, int64, *psbt.Packet,
}
}
packet.UnsignedTx.TxOut = append(packet.UnsignedTx.TxOut, out)
packet.Outputs = append(packet.Outputs, psbt.POutput{})
var pOut psbt.POutput
// If this is a MuSig2 channel, we also need to communicate the internal
// key to the caller. Otherwise, they cannot verify the construction of
// the P2TR output script.
pOut.TaprootInternalKey = fn.MapOptionZ(
i.TaprootInternalKey(), schnorr.SerializePubKey,
)
packet.Outputs = append(packet.Outputs, pOut)
return addr, out.Value, packet, nil
}