From fdd24fc1d680dbad359776b11ed2af6af22ed4d0 Mon Sep 17 00:00:00 2001
From: Juan Pablo Civile <elementohb@gmail.com>
Date: Fri, 15 Jan 2021 14:56:16 -0300
Subject: [PATCH] routerrpc: limit max parts if the invoice doesn't declare MPP
 support

---
 lnrpc/routerrpc/router_backend.go | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/lnrpc/routerrpc/router_backend.go b/lnrpc/routerrpc/router_backend.go
index 74775fc5c..6bb5b8be9 100644
--- a/lnrpc/routerrpc/router_backend.go
+++ b/lnrpc/routerrpc/router_backend.go
@@ -648,6 +648,10 @@ func (r *RouterBackend) extractIntentFromSendRequest(
 			payIntent.Amount = *payReq.MilliSat
 		}
 
+		if !payReq.Features.HasFeature(lnwire.MPPOptional) {
+			payIntent.MaxParts = 1
+		}
+
 		copy(payIntent.PaymentHash[:], payReq.PaymentHash[:])
 		destKey := payReq.Destination.SerializeCompressed()
 		copy(payIntent.Target[:], destKey)