cli: add optional last hop to the loop in quote

cmd/loop/loopin.go

@@ -109,11 +109,25 @@ func loopIn(ctx *cli.Context) error {
 		return err
 	}
 
-	quoteReq := &looprpc.QuoteRequest{
-		Amt:          int64(amt),
-		ConfTarget:   htlcConfTarget,
-		ExternalHtlc: external,
+	var lastHop []byte
+	if ctx.IsSet(lastHopFlag.Name) {
+		lastHopVertex, err := route.NewVertexFromStr(
+			ctx.String(lastHopFlag.Name),
+		)
+		if err != nil {
+			return err
+		}
+
+		lastHop = lastHopVertex[:]
 	}
+
+	quoteReq := &looprpc.QuoteRequest{
+		Amt:           int64(amt),
+		ConfTarget:    htlcConfTarget,
+		ExternalHtlc:  external,
+		LoopInLastHop: lastHop,
+	}
+
 	quote, err := client.GetLoopInQuote(context.Background(), quoteReq)
 	if err != nil {
 		return err
@@ -147,17 +161,7 @@ func loopIn(ctx *cli.Context) error {
 		HtlcConfTarget: htlcConfTarget,
 		Label:          label,
 		Initiator:      defaultInitiator,
-	}
-
-	if ctx.IsSet(lastHopFlag.Name) {
-		lastHop, err := route.NewVertexFromStr(
-			ctx.String(lastHopFlag.Name),
-		)
-		if err != nil {
-			return err
-		}
-
-		req.LastHop = lastHop[:]
+		LastHop:        lastHop,
 	}
 
 	resp, err := client.LoopIn(context.Background(), req)

cmd/loop/quote.go

@@ -8,6 +8,7 @@ import (
 
 	"github.com/lightninglabs/loop"
 	"github.com/lightninglabs/loop/looprpc"
+	"github.com/lightningnetwork/lnd/routing/route"
 	"github.com/urfave/cli"
 )
 
@@ -22,8 +23,16 @@ var quoteInCommand = cli.Command{
 	Usage:       "get a quote for the cost of a loop in swap",
 	ArgsUsage:   "amt",
 	Description: "Allows to determine the cost of a swap up front",
-	Flags:       []cli.Flag{confTargetFlag, verboseFlag},
-	Action:      quoteIn,
+	Flags: []cli.Flag{
+		cli.StringFlag{
+			Name: lastHopFlag.Name,
+			Usage: "the pubkey of the last hop to use for the " +
+				"quote",
+		},
+		confTargetFlag,
+		verboseFlag,
+	},
+	Action: quoteIn,
 }
 
 func quoteIn(ctx *cli.Context) error {
@@ -44,11 +53,23 @@ func quoteIn(ctx *cli.Context) error {
 	}
 	defer cleanup()
 
-	ctxb := context.Background()
 	quoteReq := &looprpc.QuoteRequest{
 		Amt:        int64(amt),
 		ConfTarget: int32(ctx.Uint64("conf_target")),
 	}
+
+	if ctx.IsSet(lastHopFlag.Name) {
+		lastHopVertex, err := route.NewVertexFromStr(
+			ctx.String(lastHopFlag.Name),
+		)
+		if err != nil {
+			return err
+		}
+
+		quoteReq.LoopInLastHop = lastHopVertex[:]
+	}
+
+	ctxb := context.Background()
 	quoteResp, err := client.GetLoopInQuote(ctxb, quoteReq)
 	if err != nil {
 		return err