f - check that peer is announced

Author: jkczyz

lightning/src/onion_message/messenger.rs

@@ -342,7 +342,9 @@ where
 		&self, recipient: PublicKey, peers: Vec<PublicKey>, entropy_source: &ES,
 		secp_ctx: &Secp256k1<T>
 	) -> Result<Vec<BlindedPath>, ()> {
+		let network_graph = self.network_graph.deref().read_only();
 		peers.into_iter()
+			.filter(|pubkey| network_graph.node(&NodeId::from_pubkey(pubkey)).is_some())
 			.map(|hop| vec![hop, recipient])
 			.map(|node_pks| BlindedPath::new_for_message(&node_pks, entropy_source, secp_ctx))
 			.collect()