Update project structure and build process

libwallet/submarineSwapV1.go

@@ -0,0 +1,62 @@
+package libwallet
+
+import (
+	"errors"
+	"fmt"
+
+	"github.com/btcsuite/btcd/chaincfg"
+	"github.com/btcsuite/btcd/wire"
+	"github.com/btcsuite/btcutil"
+	"github.com/muun/libwallet/swaps"
+)
+
+type coinSubmarineSwapV1 struct {
+	Network         *chaincfg.Params
+	OutPoint        wire.OutPoint
+	KeyPath         string
+	Amount          btcutil.Amount
+	RefundAddress   string
+	PaymentHash256  []byte
+	ServerPublicKey []byte
+	LockTime        int64
+}
+
+func (c *coinSubmarineSwapV1) SignInput(index int, tx *wire.MsgTx, userKey *HDPrivateKey,
+	_ *HDPublicKey) error {
+
+	userKey, err := userKey.DeriveTo(c.KeyPath)
+	if err != nil {
+		return fmt.Errorf("failed to derive user key: %w", err)
+	}
+
+	witnessScript, err := swaps.CreateWitnessScriptSubmarineSwapV1(
+		c.RefundAddress,
+		c.PaymentHash256,
+		c.ServerPublicKey,
+		c.LockTime,
+		userKey.Network.network,
+	)
+	if err != nil {
+		return err
+	}
+
+	redeemScript, err := createNonNativeSegwitRedeemScript(witnessScript)
+	if err != nil {
+		return fmt.Errorf("failed to build reedem script for signing: %w", err)
+	}
+
+	sig, err := signNonNativeSegwitInput(
+		index, tx, userKey, redeemScript, witnessScript, c.Amount)
+	if err != nil {
+		return err
+	}
+
+	txInput := tx.TxIn[index]
+	txInput.Witness = wire.TxWitness{sig, userKey.PublicKey().Raw(), witnessScript}
+
+	return nil
+}
+
+func (c *coinSubmarineSwapV1) FullySignInput(index int, tx *wire.MsgTx, userKey, muunKey *HDPrivateKey) error {
+	return errors.New("cannot fully sign submarine swap transactions")
+}