routing+routerrpc+lncli: enable last hop restriction for payments

cmd/lncli/commands.go

@@ -24,6 +24,7 @@ import (
 	"github.com/golang/protobuf/proto"
 	"github.com/lightningnetwork/lnd/lnrpc"
 	"github.com/lightningnetwork/lnd/lnrpc/routerrpc"
+	"github.com/lightningnetwork/lnd/routing/route"
 	"github.com/lightningnetwork/lnd/walletunlocker"
 	"github.com/urfave/cli"
 	"golang.org/x/crypto/ssh/terminal"
@@ -2040,12 +2041,19 @@ func closedChannels(ctx *cli.Context) error {
 	return nil
 }
 
-var cltvLimitFlag = cli.UintFlag{
+var (
+	cltvLimitFlag = cli.UintFlag{
 		Name: "cltv_limit",
 		Usage: "the maximum time lock that may be used for " +
 			"this payment",
 	}
 
+	lastHopFlag = cli.StringFlag{
+		Name:  "last_hop",
+		Usage: "pubkey of the last hop to use for this payment",
+	}
+)
+
 // paymentFlags returns common flags for sendpayment and payinvoice.
 func paymentFlags() []cli.Flag {
 	return []cli.Flag{
@@ -2065,6 +2073,7 @@ func paymentFlags() []cli.Flag {
 				"payment",
 		},
 		cltvLimitFlag,
+		lastHopFlag,
 		cli.Uint64Flag{
 			Name: "outgoing_chan_id",
 			Usage: "short channel id of the outgoing channel to " +
@@ -2281,6 +2290,16 @@ func sendPaymentRequest(ctx *cli.Context, req *lnrpc.SendRequest) error {
 	req.FeeLimit = feeLimit
 
 	req.OutgoingChanId = ctx.Uint64("outgoing_chan_id")
+	if ctx.IsSet(lastHopFlag.Name) {
+		lastHop, err := route.NewVertexFromStr(
+			ctx.String(lastHopFlag.Name),
+		)
+		if err != nil {
+			return err
+		}
+		req.LastHopPubkey = lastHop[:]
+	}
+
 	req.CltvLimit = uint32(ctx.Int(cltvLimitFlag.Name))
 
 	amt := req.Amt

lnrpc/routerrpc/router.pb.go

@@ -231,6 +231,9 @@ type SendPaymentRequest struct {
 	//any channel may be used.
 	OutgoingChanId uint64 `protobuf:"varint,8,opt,name=outgoing_chan_id,json=outgoingChanId,proto3" json:"outgoing_chan_id,omitempty"`
 	//*
+	//The pubkey of the last hop of the route. If empty, any hop may be used.
+	LastHopPubkey []byte `protobuf:"bytes,14,opt,name=last_hop_pubkey,json=lastHopPubkey,proto3" json:"last_hop_pubkey,omitempty"`
+	//*
 	//An optional maximum total time lock for the route. This should not exceed
 	//lnd's `--max-cltv-expiry` setting. If zero, then the value of
 	//`--max-cltv-expiry` is enforced.
@@ -343,6 +346,13 @@ func (m *SendPaymentRequest) GetOutgoingChanId() uint64 {
 	return 0
 }
 
+func (m *SendPaymentRequest) GetLastHopPubkey() []byte {
+	if m != nil {
+		return m.LastHopPubkey
+	}
+	return nil
+}
+
 func (m *SendPaymentRequest) GetCltvLimit() int32 {
 	if m != nil {
 		return m.CltvLimit
@@ -1445,130 +1455,131 @@ func init() {
 func init() { proto.RegisterFile("routerrpc/router.proto", fileDescriptor_7a0613f69d37b0a5) }
 
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+	0xf5, 0xef, 0x4f, 0xae, 0x5d, 0x3e, 0x9a, 0x5e, 0x1e, 0x0f, 0x82, 0xf1, 0x89, 0x27, 0x86, 0x6a,
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+	0xdf, 0xf5, 0xaf, 0x7d, 0xc6, 0xff, 0x10, 0x84, 0x37, 0x27, 0x9e, 0x3f, 0x3c, 0x91, 0x5d, 0x77,
-	0xa5, 0x50, 0x11, 0x00, 0x00,
+	0x32, 0xb3, 0x72, 0xb9, 0x2e, 0xff, 0x91, 0xf2, 0x9b, 0xff, 0x05, 0x00, 0x00, 0xff, 0xff, 0x1f,
+	0xb3, 0x05, 0x24, 0x78, 0x11, 0x00, 0x00,
 }
 
 // Reference imports to suppress errors if they are not otherwise used.

lnrpc/routerrpc/router.proto

@@ -77,6 +77,11 @@ message SendPaymentRequest {
     */
     uint64 outgoing_chan_id = 8 [jstype = JS_STRING];
 
+    /**
+    The pubkey of the last hop of the route. If empty, any hop may be used.
+    */
+    bytes last_hop_pubkey = 14;
+
     /** 
     An optional maximum total time lock for the route. This should not exceed
     lnd's `--max-cltv-expiry` setting. If zero, then the value of

lnrpc/routerrpc/router_backend.go

@@ -497,6 +497,17 @@ func (r *RouterBackend) extractIntentFromSendRequest(
 		payIntent.OutgoingChannelID = &rpcPayReq.OutgoingChanId
 	}
 
+	// Pass along a last hop restriction if specified.
+	if len(rpcPayReq.LastHopPubkey) > 0 {
+		lastHop, err := route.NewVertexFromBytes(
+			rpcPayReq.LastHopPubkey,
+		)
+		if err != nil {
+			return nil, err
+		}
+		payIntent.LastHop = &lastHop
+	}
+
 	// Take the CLTV limit from the request if set, otherwise use the max.
 	cltvLimit, err := ValidateCLTVLimit(
 		uint32(rpcPayReq.CltvLimit), r.MaxTotalTimelock,

lnrpc/rpc.proto

@@ -937,6 +937,11 @@ message SendRequest {
     */
     uint64 outgoing_chan_id = 9 [jstype = JS_STRING];
 
+    /**
+    The pubkey of the last hop of the route. If empty, any hop may be used.
+    */
+    bytes last_hop_pubkey = 13;
+
     /** 
     An optional maximum total time lock for the route. This should not exceed
     lnd's `--max-cltv-expiry` setting. If zero, then the value of

lnrpc/rpc.swagger.json

@@ -3661,6 +3661,11 @@
           "format": "uint64",
           "description": "*\nThe channel id of the channel that must be taken to the first hop. If zero,\nany channel may be used."
         },
+        "last_hop_pubkey": {
+          "type": "string",
+          "format": "byte",
+          "description": "*\nThe pubkey of the last hop of the route. If empty, any hop may be used."
+        },
         "cltv_limit": {
           "type": "integer",
           "format": "int64",

routing/payment_session.go

@@ -89,6 +89,7 @@ func (p *paymentSession) RequestRoute(payment *LightningPayment,
 		ProbabilitySource: ss.MissionControl.GetProbability,
 		FeeLimit:          payment.FeeLimit,
 		OutgoingChannelID: payment.OutgoingChannelID,
+		LastHop:           payment.LastHop,
 		CltvLimit:         cltvLimit,
 	}
 

routing/router.go

@@ -1596,6 +1596,10 @@ type LightningPayment struct {
 	// hop. If nil, any channel may be used.
 	OutgoingChannelID *uint64
 
+	// LastHop is the pubkey of the last node before the final destination
+	// is reached. If nil, any node may be used.
+	LastHop *route.Vertex
+
 	// PaymentRequest is an optional payment request that this payment is
 	// attempting to complete.
 	PaymentRequest []byte

rpcserver.go

@@ -3017,6 +3017,7 @@ type rpcPaymentIntent struct {
 	cltvDelta         uint16
 	routeHints        [][]zpay32.HopHint
 	outgoingChannelID *uint64
+	lastHop           *route.Vertex
 	payReq            []byte
 
 	destTLV []tlv.Record
@@ -3058,6 +3059,17 @@ func extractPaymentIntent(rpcPayReq *rpcPaymentRequest) (rpcPaymentIntent, error
 		payIntent.outgoingChannelID = &rpcPayReq.OutgoingChanId
 	}
 
+	// Pass along a last hop restriction if specified.
+	if len(rpcPayReq.LastHopPubkey) > 0 {
+		lastHop, err := route.NewVertexFromBytes(
+			rpcPayReq.LastHopPubkey,
+		)
+		if err != nil {
+			return payIntent, err
+		}
+		payIntent.lastHop = &lastHop
+	}
+
 	// Take the CLTV limit from the request if set, otherwise use the max.
 	cltvLimit, err := routerrpc.ValidateCLTVLimit(
 		rpcPayReq.CltvLimit, cfg.MaxOutgoingCltvExpiry,
@@ -3237,6 +3249,7 @@ func (r *rpcServer) dispatchPaymentIntent(
 			PaymentHash:       payIntent.rHash,
 			RouteHints:        payIntent.routeHints,
 			OutgoingChannelID: payIntent.outgoingChannelID,
+			LastHop:           payIntent.lastHop,
 			PaymentRequest:    payIntent.payReq,
 			PayAttemptTimeout: routing.DefaultPayAttemptTimeout,
 			FinalDestRecords:  payIntent.destTLV,