feat: restore cashu wallet from seed

frontend/src/lib/backendType.ts

@@ -33,7 +33,7 @@ export const backendTypeConfigs: Record<BackendType, BackendTypeConfig> = {
     hasNodeBackup: false,
   },
   CASHU: {
-    hasMnemonic: false,
+    hasMnemonic: true,
     hasChannelManagement: false,
     hasNodeBackup: false,
   },

frontend/src/screens/settings/DebugTools.tsx

@@ -304,7 +304,7 @@ export default function DebugTools() {
               Get Network Graph
             </Button>
           </AlertDialogTrigger>
-          {info?.backendType === "LDK" && (
+          {(info?.backendType === "LDK" || info?.backendType === "CASHU") && (
             <AlertDialogTrigger asChild>
               <Button onClick={() => setDialog("resetRoutingData")}>
                 Clear Routing Data

go.mod

@@ -7,7 +7,7 @@ toolchain go1.23.3
 require (
 	github.com/adrg/xdg v0.5.3
 	github.com/breez/breez-sdk-go v0.5.2
-	github.com/elnosh/gonuts v0.3.1-0.20250107155549-ae74d5ac3a23
+	github.com/elnosh/gonuts v0.3.1-0.20250109171605-ee81d0d42b97
 	github.com/getAlby/glalby-go v0.0.0-20240621192717-95673c864d59
 	github.com/getAlby/ldk-node-go v0.0.0-20250106052504-d4191410486f
 	github.com/go-gormigrate/gormigrate/v2 v2.1.3

go.sum

@@ -180,8 +180,8 @@ github.com/ebitengine/purego v0.6.0-alpha.5 h1:EYID3JOAdmQ4SNZYJHu9V6IqOeRQDBYxq
 github.com/ebitengine/purego v0.6.0-alpha.5/go.mod h1:ah1In8AOtksoNK6yk5z1HTJeUkC1Ez4Wk2idgGslMwQ=
 github.com/elnosh/btc-docker-test v0.0.0-20241223164556-146e52a0433b h1:JbZVAqKBVRkvHuZZJsf8MvO+I7HGaVNCMQvp7WMFGqs=
 github.com/elnosh/btc-docker-test v0.0.0-20241223164556-146e52a0433b/go.mod h1:4PlP53czOHN+XvjyQZh+zgrzkI7BYFvJajxKK2zquyE=
-github.com/elnosh/gonuts v0.3.1-0.20250107155549-ae74d5ac3a23 h1:L74EHKPpS5PDMHc/yhP24S7KaxHQBfCHudYpNXFmPI8=
-github.com/elnosh/gonuts v0.3.1-0.20250107155549-ae74d5ac3a23/go.mod h1:s1lwjLf5HjrkgiMvdYPCz7HNAUjYS94C2WQcYaFbijc=
+github.com/elnosh/gonuts v0.3.1-0.20250109171605-ee81d0d42b97 h1:m+BmGO3iJuX9QFbk1ClOPUgo758w1SF/OxQNONe62ow=
+github.com/elnosh/gonuts v0.3.1-0.20250109171605-ee81d0d42b97/go.mod h1:s1lwjLf5HjrkgiMvdYPCz7HNAUjYS94C2WQcYaFbijc=
 github.com/envoyproxy/go-control-plane v0.9.0/go.mod h1:YTl/9mNaCwkRvm6d1a2C3ymFceY/DCBVvsKhRF0iEA4=
 github.com/envoyproxy/go-control-plane v0.9.1-0.20191026205805-5f8ba28d4473/go.mod h1:YTl/9mNaCwkRvm6d1a2C3ymFceY/DCBVvsKhRF0iEA4=
 github.com/envoyproxy/go-control-plane v0.9.4/go.mod h1:6rpuAdCZL397s3pYoYcLgu1mIlRU8Am5FuJP05cCM98=

lnclient/cashu/cashu.go

@@ -13,6 +13,7 @@ import (
 	"github.com/elnosh/gonuts/cashu/nuts/nut05"
 	"github.com/elnosh/gonuts/wallet"
 	"github.com/elnosh/gonuts/wallet/storage"
+	"github.com/getAlby/hub/config"
 	"github.com/getAlby/hub/constants"
 	"github.com/getAlby/hub/lnclient"
 	"github.com/getAlby/hub/logger"
@@ -21,10 +22,11 @@ import (
 )
 
 type CashuService struct {
-	wallet *wallet.Wallet
+	wallet  *wallet.Wallet
+	workDir string
 }
 
-func NewCashuService(workDir string, mintUrl string) (result lnclient.LNClient, err error) {
+func NewCashuService(cfg config.Config, workDir, encryptionKey, mintUrl string) (result lnclient.LNClient, err error) {
 	if workDir == "" {
 		return nil, errors.New("one or more required cashu configuration are missing")
 	}
@@ -43,21 +45,31 @@ func NewCashuService(workDir string, mintUrl string) (result lnclient.LNClient,
 	logger.Logger.WithField("mintUrl", mintUrl).Info("Setting up cashu wallet")
 	config := wallet.Config{WalletPath: newpath, CurrentMintURL: mintUrl}
 
-	wallet, err := wallet.LoadWallet(config)
+	cashuWallet, err := wallet.LoadWallet(config)
 	if err != nil {
 		logger.Logger.WithError(err).Error("Failed to load cashu wallet")
 		return nil, err
 	}
 
 	cs := CashuService{
-		wallet: wallet,
+		wallet:  cashuWallet,
+		workDir: workDir,
+	}
+
+	cashuWalletMnemonic := cashuWallet.Mnemonic()
+	mnemonic, _ := cfg.Get("Mnemonic", encryptionKey)
+	if mnemonic != cashuWalletMnemonic {
+		if err := cfg.SetUpdate("Mnemonic", cashuWalletMnemonic, encryptionKey); err != nil {
+			logger.Logger.WithError(err).Error("Failed to save mnemonic from cashu wallet")
+			return nil, err
+		}
 	}
 
 	return &cs, nil
 }
 
 func (cs *CashuService) Shutdown() error {
-	return nil
+	return cs.wallet.Shutdown()
 }
 
 func (cs *CashuService) SendPaymentSync(ctx context.Context, invoice string, amount *uint64) (response *lnclient.PayInvoiceResponse, err error) {
@@ -208,6 +220,25 @@ func (cs *CashuService) RedeemOnchainFunds(ctx context.Context, toAddress string
 }
 
 func (cs *CashuService) ResetRouter(key string) error {
+	mnemonic := cs.wallet.Mnemonic()
+	currentMint := cs.wallet.CurrentMint()
+
+	if err := cs.wallet.Shutdown(); err != nil {
+		return err
+	}
+
+	if err := os.RemoveAll(cs.workDir); err != nil {
+		logger.Logger.WithError(err).Error("Failed to remove wallet directory")
+		return err
+	}
+
+	amountRestored, err := wallet.Restore(cs.workDir, mnemonic, []string{currentMint})
+	if err != nil {
+		logger.Logger.WithError(err).Error("Failed restore cashu wallet")
+		return err
+	}
+
+	logger.Logger.WithField("amountRestored", amountRestored).Info("Successfully restored cashu wallet")
 	return nil
 }
 
@@ -286,9 +317,11 @@ func (cs *CashuService) cashuMintQuoteToTransaction(mintQuote *storage.MintQuote
 	descriptionHash := paymentRequest.DescriptionHash
 
 	return &lnclient.Transaction{
-		Type:            constants.TRANSACTION_TYPE_INCOMING,
-		Invoice:         mintQuote.PaymentRequest,
-		PaymentHash:     paymentRequest.PaymentHash,
+		Type:        constants.TRANSACTION_TYPE_INCOMING,
+		Invoice:     mintQuote.PaymentRequest,
+		PaymentHash: paymentRequest.PaymentHash,
+		// note: setting dummy preimage so that it gets marked as settled
+		Preimage:        paymentRequest.PaymentHash,
 		Amount:          paymentRequest.MSatoshi,
 		CreatedAt:       int64(paymentRequest.CreatedAt),
 		ExpiresAt:       expiresAt,

service/start.go

@@ -332,7 +332,7 @@ func (svc *service) launchLNBackend(ctx context.Context, encryptionKey string) e
 		cashuMintUrl, _ := svc.cfg.Get("CashuMintUrl", encryptionKey)
 		cashuWorkdir := path.Join(svc.cfg.GetEnv().Workdir, "cashu")
 
-		lnClient, err = cashu.NewCashuService(cashuWorkdir, cashuMintUrl)
+		lnClient, err = cashu.NewCashuService(svc.cfg, cashuWorkdir, encryptionKey, cashuMintUrl)
 	default:
 		logger.Logger.WithField("backend_type", lnBackend).Error("Unsupported LNBackendType")
 		return fmt.Errorf("unsupported backend type: %s", lnBackend)