new command: scbforceclose

cmd/chantools/root.go

@@ -113,6 +113,7 @@ func main() {
 		newFilterBackupCommand(),
 		newFixOldBackupCommand(),
 		newForceCloseCommand(),
+		newScbForceCloseCommand(),
 		newGenImportScriptCommand(),
 		newMigrateDBCommand(),
 		newPullAnchorCommand(),

cmd/chantools/scbforceclose.go

@@ -0,0 +1,224 @@
+package main
+
+import (
+	"bytes"
+	"encoding/hex"
+	"errors"
+	"fmt"
+	"os"
+	"strings"
+
+	"github.com/lightninglabs/chantools/btc"
+	"github.com/lightninglabs/chantools/lnd"
+	"github.com/lightningnetwork/lnd/chanbackup"
+	"github.com/lightningnetwork/lnd/input"
+	"github.com/spf13/cobra"
+)
+
+type scbForceCloseCommand struct {
+	APIURL  string
+	Publish bool
+
+	// channel.backup.
+	SingleBackup string
+	SingleFile   string
+	MultiBackup  string
+	MultiFile    string
+
+	rootKey *rootKey
+	cmd     *cobra.Command
+}
+
+func newScbForceCloseCommand() *cobra.Command {
+	cc := &scbForceCloseCommand{}
+	cc.cmd = &cobra.Command{
+		Use: "scbforceclose",
+		Short: "Force-close the last state that is in the SCB " +
+			"provided",
+		Long:    forceCloseWarning,
+		Example: `chantools scbforceclose --multi_file channel.backup`,
+		RunE:    cc.Execute,
+	}
+	cc.cmd.Flags().StringVar(
+		&cc.APIURL, "apiurl", defaultAPIURL, "API URL to use (must "+
+			"be esplora compatible)",
+	)
+
+	cc.cmd.Flags().StringVar(
+		&cc.SingleBackup, "single_backup", "", "a hex encoded single "+
+			"channel backup obtained from exportchanbackup for "+
+			"force-closing channels",
+	)
+	cc.cmd.Flags().StringVar(
+		&cc.MultiBackup, "multi_backup", "", "a hex encoded "+
+			"multi-channel backup obtained from exportchanbackup "+
+			"for force-closing channels",
+	)
+	cc.cmd.Flags().StringVar(
+		&cc.SingleFile, "single_file", "", "the path to a "+
+			"single-channel backup file",
+	)
+	cc.cmd.Flags().StringVar(
+		&cc.MultiFile, "multi_file", "", "the path to a "+
+			"single-channel backup file (channel.backup)",
+	)
+
+	cc.cmd.Flags().BoolVar(
+		&cc.Publish, "publish", false, "publish force-closing TX to "+
+			"the chain API instead of just printing the TX",
+	)
+
+	cc.rootKey = newRootKey(cc.cmd, "decrypting the backup and signing tx")
+
+	return cc.cmd
+}
+
+func (c *scbForceCloseCommand) Execute(_ *cobra.Command, _ []string) error {
+	extendedKey, err := c.rootKey.read()
+	if err != nil {
+		return fmt.Errorf("error reading root key: %w", err)
+	}
+
+	api := &btc.ExplorerAPI{BaseURL: c.APIURL}
+
+	keyRing := &lnd.HDKeyRing{
+		ExtendedKey: extendedKey,
+		ChainParams: chainParams,
+	}
+
+	signer := &lnd.Signer{
+		ExtendedKey: extendedKey,
+		ChainParams: chainParams,
+	}
+	signer.MusigSessionManager = input.NewMusigSessionManager(
+		signer.FetchPrivateKey,
+	)
+
+	var backups []chanbackup.Single
+	if c.SingleBackup != "" || c.SingleFile != "" {
+		if c.SingleBackup != "" && c.SingleFile != "" {
+			return errors.New("must not pass --single_backup and " +
+				"--single_file together")
+		}
+		var singleBackupBytes []byte
+		if c.SingleBackup != "" {
+			singleBackupBytes, err = hex.DecodeString(
+				c.SingleBackup,
+			)
+		} else if c.SingleFile != "" {
+			singleBackupBytes, err = os.ReadFile(c.SingleFile)
+		}
+		if err != nil {
+			return fmt.Errorf("failed to get single backup: %w",
+				err)
+		}
+		var s chanbackup.Single
+		r := bytes.NewReader(singleBackupBytes)
+		if err := s.UnpackFromReader(r, keyRing); err != nil {
+			return fmt.Errorf("failed to unpack single backup: %w",
+				err)
+		}
+		backups = append(backups, s)
+	}
+	if c.MultiBackup != "" || c.MultiFile != "" {
+		if len(backups) != 0 {
+			return errors.New("must not pass single and multi " +
+				"backups together")
+		}
+		if c.MultiBackup != "" && c.MultiFile != "" {
+			return errors.New("must not pass --multi_backup and " +
+				"--multi_file together")
+		}
+		var multiBackupBytes []byte
+		if c.MultiBackup != "" {
+			multiBackupBytes, err = hex.DecodeString(c.MultiBackup)
+		} else if c.MultiFile != "" {
+			multiBackupBytes, err = os.ReadFile(c.MultiFile)
+		}
+		if err != nil {
+			return fmt.Errorf("failed to get multi backup: %w", err)
+		}
+		var m chanbackup.Multi
+		r := bytes.NewReader(multiBackupBytes)
+		if err := m.UnpackFromReader(r, keyRing); err != nil {
+			return fmt.Errorf("failed to unpack multi backup: %w",
+				err)
+		}
+		backups = append(backups, m.StaticBackups...)
+	}
+
+	backupsWithInputs := make([]chanbackup.Single, 0, len(backups))
+	for _, s := range backups {
+		if s.CloseTxInputs != nil {
+			backupsWithInputs = append(backupsWithInputs, s)
+		}
+	}
+
+	fmt.Println()
+	fmt.Printf("Found %d channel backups, %d of them have close tx.\n",
+		len(backups), len(backupsWithInputs))
+
+	if len(backupsWithInputs) == 0 {
+		fmt.Println("No channel backups that can be used for force " +
+			"close.")
+		return nil
+	}
+
+	fmt.Println()
+	fmt.Println("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@")
+	fmt.Println(strings.TrimSpace(forceCloseWarning))
+	fmt.Println("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@")
+	fmt.Println()
+
+	fmt.Printf("Type YES to proceed: ")
+	var userInput string
+	if _, err := fmt.Scan(&userInput); err != nil {
+		return errors.New("failed to read user input")
+	}
+	if strings.TrimSpace(userInput) != "YES" {
+		return errors.New("cancelled by user")
+	}
+
+	if c.Publish {
+		fmt.Println("Signed transactions will be broadcasted " +
+			"automatically.")
+		fmt.Printf("Type YES again to proceed: ")
+		if _, err := fmt.Scan(&userInput); err != nil {
+			return errors.New("failed to read user input")
+		}
+		if strings.TrimSpace(userInput) != "YES" {
+			return errors.New("cancelled by user")
+		}
+	}
+
+	for _, s := range backupsWithInputs {
+		signedTx, err := chanbackup.SignCloseTx(
+			s, keyRing, signer, signer,
+		)
+		if err != nil {
+			return fmt.Errorf("signCloseTx failed for %s: %w",
+				s.FundingOutpoint, err)
+		}
+		var buf bytes.Buffer
+		if err := signedTx.Serialize(&buf); err != nil {
+			return fmt.Errorf("failed to serialize signed %s: %w",
+				s.FundingOutpoint, err)
+		}
+		txHex := hex.EncodeToString(buf.Bytes())
+		fmt.Println(s.FundingOutpoint)
+		fmt.Println(txHex)
+		fmt.Println()
+
+		// Publish TX.
+		if c.Publish {
+			response, err := api.PublishTx(txHex)
+			if err != nil {
+				return err
+			}
+			log.Infof("Published TX %s, response: %s",
+				signedTx.TxHash(), response)
+		}
+	}
+
+	return nil
+}