fix: correct amounts in LSPS1 order summary

api/lsp.go

@@ -16,6 +16,7 @@ import (
 	"github.com/getAlby/nostr-wallet-connect/lnclient"
 	"github.com/getAlby/nostr-wallet-connect/logger"
 	"github.com/getAlby/nostr-wallet-connect/lsp"
+	decodepay "github.com/nbd-wtf/ln-decodepay"
 	"github.com/sirupsen/logrus"
 )
 
@@ -120,9 +121,30 @@ func (api *api) NewInstantChannelInvoice(ctx context.Context, request *NewInstan
 		return nil, err
 	}
 
+	paymentRequest, err := decodepay.Decodepay(invoice)
+	if err != nil {
+		logger.Logger.WithError(err).Error("Failed to decode bolt11 invoice")
+		return nil, err
+	}
+
+	invoiceAmount := uint64(paymentRequest.MSatoshi / 1000)
+	incomingLiquidity := uint64(0)
+	outgoingLiquidity := uint64(0)
+
+	if invoiceAmount < request.Amount {
+		// assume that the invoice is only the fee
+		// and that the user is requesting incoming liquidity (LSPS1)
+		incomingLiquidity = request.Amount
+	} else {
+		outgoingLiquidity = invoiceAmount - fee
+	}
+
 	newChannelResponse := &NewInstantChannelInvoiceResponse{
-		Invoice: invoice,
-		Fee:     fee,
+		Invoice:           invoice,
+		Fee:               fee,
+		InvoiceAmount:     invoiceAmount,
+		IncomingLiquidity: incomingLiquidity,
+		OutgoingLiquidity: outgoingLiquidity,
 	}
 
 	logger.Logger.WithFields(logrus.Fields{

api/models.go

@@ -236,6 +236,9 @@ type NewInstantChannelInvoiceRequest struct {
 }
 
 type NewInstantChannelInvoiceResponse struct {
-	Invoice string `json:"invoice"`
-	Fee     uint64 `json:"fee"`
+	Invoice           string `json:"invoice"`
+	Fee               uint64 `json:"fee"`
+	InvoiceAmount     uint64 `json:"invoiceAmount"`
+	IncomingLiquidity uint64 `json:"incomingLiquidity"`
+	OutgoingLiquidity uint64 `json:"outgoingLiquidity"`
 }

frontend/src/screens/channels/CurrentChannelOrder.tsx

@@ -616,6 +616,32 @@ function PayLightningChannelOrder({ order }: { order: NewChannelOrder }) {
             <div className="border rounded-lg">
               <Table>
                 <TableBody>
+                  {wrappedInvoiceResponse.outgoingLiquidity > 0 && (
+                    <TableRow>
+                      <TableCell className="font-medium p-3">
+                        Spending Balance
+                      </TableCell>
+                      <TableCell className="text-right p-3">
+                        {new Intl.NumberFormat().format(
+                          wrappedInvoiceResponse.outgoingLiquidity
+                        )}{" "}
+                        sats
+                      </TableCell>
+                    </TableRow>
+                  )}
+                  {wrappedInvoiceResponse.incomingLiquidity > 0 && (
+                    <TableRow>
+                      <TableCell className="font-medium p-3">
+                        Incoming Liquidity
+                      </TableCell>
+                      <TableCell className="text-right p-3">
+                        {new Intl.NumberFormat().format(
+                          wrappedInvoiceResponse.incomingLiquidity
+                        )}{" "}
+                        sats
+                      </TableCell>
+                    </TableRow>
+                  )}
                   <TableRow>
                     <TableCell className="font-medium p-3 flex flex-row gap-1.5 items-center">
                       Fee
@@ -632,7 +658,9 @@ function PayLightningChannelOrder({ order }: { order: NewChannelOrder }) {
                       Amount to pay
                     </TableCell>
                     <TableCell className="font-semibold text-right p-3">
-                      {new Intl.NumberFormat().format(parseInt(order.amount))}{" "}
+                      {new Intl.NumberFormat().format(
+                        wrappedInvoiceResponse.invoiceAmount
+                      )}{" "}
                       sats
                     </TableCell>
                   </TableRow>

frontend/src/types.ts

@@ -287,6 +287,9 @@ export type NewInstantChannelInvoiceRequest = {
 export type NewInstantChannelInvoiceResponse = {
   invoice: string;
   fee: number;
+  invoiceAmount: number;
+  incomingLiquidity: number;
+  outgoingLiquidity: number;
 };
 
 export type RedeemOnchainFundsResponse = {