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463 changes: 463 additions & 0 deletions assets/actions.go

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522 changes: 522 additions & 0 deletions assets/client.go

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88 changes: 88 additions & 0 deletions assets/htlc/script.go
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package htlc

import (
"github.com/btcsuite/btcd/btcec/v2"
"github.com/btcsuite/btcd/btcec/v2/schnorr"
"github.com/btcsuite/btcd/txscript"
"github.com/decred/dcrd/dcrec/secp256k1/v4"
"github.com/lightninglabs/taproot-assets/asset"
"github.com/lightningnetwork/lnd/input"
"github.com/lightningnetwork/lnd/keychain"
"github.com/lightningnetwork/lnd/lntypes"
)

// GenSuccessPathScript constructs an HtlcScript for the success payment path.
func GenSuccessPathScript(receiverHtlcKey *btcec.PublicKey,
swapHash lntypes.Hash) ([]byte, error) {

builder := txscript.NewScriptBuilder()

builder.AddData(schnorr.SerializePubKey(receiverHtlcKey))
builder.AddOp(txscript.OP_CHECKSIGVERIFY)
builder.AddOp(txscript.OP_SIZE)
builder.AddInt64(32)
builder.AddOp(txscript.OP_EQUALVERIFY)
builder.AddOp(txscript.OP_HASH160)
builder.AddData(input.Ripemd160H(swapHash[:]))
builder.AddOp(txscript.OP_EQUALVERIFY)
builder.AddInt64(1)
builder.AddOp(txscript.OP_CHECKSEQUENCEVERIFY)

return builder.Script()
}

// GenTimeoutPathScript constructs an HtlcScript for the timeout payment path.
func GenTimeoutPathScript(senderHtlcKey *btcec.PublicKey, csvExpiry int64) (
[]byte, error) {

builder := txscript.NewScriptBuilder()
builder.AddData(schnorr.SerializePubKey(senderHtlcKey))
builder.AddOp(txscript.OP_CHECKSIGVERIFY)
builder.AddInt64(csvExpiry)
builder.AddOp(txscript.OP_CHECKSEQUENCEVERIFY)
return builder.Script()
}

// GetOpTrueScript returns a script that always evaluates to true.
func GetOpTrueScript() ([]byte, error) {
return txscript.NewScriptBuilder().AddOp(txscript.OP_TRUE).Script()
}

// CreateOpTrueLeaf creates a taproot leaf that always evaluates to true.
func CreateOpTrueLeaf() (asset.ScriptKey, txscript.TapLeaf,
*txscript.IndexedTapScriptTree, *txscript.ControlBlock, error) {

// Create the taproot OP_TRUE script.
tapScript, err := GetOpTrueScript()
if err != nil {
return asset.ScriptKey{}, txscript.TapLeaf{}, nil, nil, err
}

tapLeaf := txscript.NewBaseTapLeaf(tapScript)
tree := txscript.AssembleTaprootScriptTree(tapLeaf)
rootHash := tree.RootNode.TapHash()
tapKey := txscript.ComputeTaprootOutputKey(asset.NUMSPubKey, rootHash[:])

merkleRootHash := tree.RootNode.TapHash()

controlBlock := &txscript.ControlBlock{
LeafVersion: txscript.BaseLeafVersion,
InternalKey: asset.NUMSPubKey,
}
tapScriptKey := asset.ScriptKey{
PubKey: tapKey,
TweakedScriptKey: &asset.TweakedScriptKey{
RawKey: keychain.KeyDescriptor{
PubKey: asset.NUMSPubKey,
},
Tweak: merkleRootHash[:],
},
}
if tapKey.SerializeCompressed()[0] ==
secp256k1.PubKeyFormatCompressedOdd {

controlBlock.OutputKeyYIsOdd = true
}

return tapScriptKey, tapLeaf, tree, controlBlock, nil
}
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