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lnwallet: add TaprootInternalKey method to ShimIntent

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If this is a taproot channel, then we'll return the internal key which'll be useful to callers.
This commit is contained in:
Olaoluwa Osuntokun 2024-04-16 16:25:22 -07:00 committed by Oliver Gugger
parent bb71c496f4
commit a841a9be30
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1 changed files with 21 additions and 0 deletions
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21
lnwallet/chanfunding/canned_assembler.go
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@ -4,6 +4,7 @@ import (
"fmt"
"github.com/btcsuite/btcd/btcec/v2"
"github.com/btcsuite/btcd/btcec/v2/schnorr/musig2"
"github.com/btcsuite/btcd/btcutil"
"github.com/btcsuite/btcd/chaincfg/chainhash"
"github.com/btcsuite/btcd/wire"
@ -105,6 +106,26 @@ func (s *ShimIntent) FundingOutput() ([]byte, *wire.TxOut, error) {
)
}
// TaprootInternalKey may return the internal key for a MuSig2 funding output,
// but only if this is actually a MuSig2 channel.
func (s *ShimIntent) TaprootInternalKey() fn.Option[*btcec.PublicKey] {
if !s.musig2 {
return fn.None[*btcec.PublicKey]()
}
// Similar to the existing p2wsh script, we'll always ensure the keys
// are sorted before use. Since we're only interested in the internal
// key, we don't need to take into account any tapscript root.
//
// We ignore the error here as this is only called after FundingOutput
// is called.
combinedKey, _, _, _ := musig2.AggregateKeys(
[]*btcec.PublicKey{s.localKey.PubKey, s.remoteKey}, true,
)
return fn.Some(combinedKey.PreTweakedKey)
}
// Cancel allows the caller to cancel a funding Intent at any time. This will
// return any resources such as coins back to the eligible pool to be used in
// order channel fundings.