Test intro node failing blinded intercept HTLC.

Author: valentinewallace

lightning/src/ln/blinded_payment_tests.rs

@@ -376,3 +376,61 @@ fn do_forward_fail_in_process_pending_htlc_fwds(check: ProcessPendingHTLCsCheck)
 	expect_payment_failed_conditions(&nodes[0], payment_hash, false,
 		PaymentFailedConditions::new().expected_htlc_error_data(INVALID_ONION_BLINDING, &[0; 32]));
 }
+
+#[test]
+fn blinded_intercept_payment() {
+	let chanmon_cfgs = create_chanmon_cfgs(3);
+	let node_cfgs = create_node_cfgs(3, &chanmon_cfgs);
+	let mut intercept_forwards_config = test_default_channel_config();
+	intercept_forwards_config.accept_intercept_htlcs = true;
+	let node_chanmgrs = create_node_chanmgrs(3, &node_cfgs, &[None, Some(intercept_forwards_config), None]);
+	let nodes = create_network(3, &node_cfgs, &node_chanmgrs);
+	create_announced_chan_between_nodes_with_value(&nodes, 0, 1, 1_000_000, 0);
+	let chan_upd = create_announced_chan_between_nodes_with_value(&nodes, 1, 2, 1_000_000, 0).0.contents;
+
+	let amt_msat = 5000;
+	let (_, payment_hash, payment_secret) = get_payment_preimage_hash(&nodes[2], Some(amt_msat), None);
+	let intercept_scid = nodes[1].node.get_intercept_scid();
+	let mut intercept_chan_upd = chan_upd.clone();
+	intercept_chan_upd.short_channel_id = intercept_scid;
+	let route_params = get_blinded_route_parameters(amt_msat, payment_secret,
+		nodes.iter().skip(1).map(|n| n.node.get_our_node_id()).collect(), &[&intercept_chan_upd],
+		&chanmon_cfgs[2].keys_manager);
+
+	nodes[0].node.send_payment(payment_hash, RecipientOnionFields::spontaneous_empty(),
+	PaymentId(payment_hash.0), route_params, Retry::Attempts(0)).unwrap();
+	check_added_monitors(&nodes[0], 1);
+	let payment_event = {
+		let mut events = nodes[0].node.get_and_clear_pending_msg_events();
+		assert_eq!(events.len(), 1);
+		SendEvent::from_event(events.remove(0))
+	};
+	nodes[1].node.handle_update_add_htlc(&nodes[0].node.get_our_node_id(), &payment_event.msgs[0]);
+	commitment_signed_dance!(nodes[1], nodes[0], &payment_event.commitment_msg, false, true);
+
+	let events = nodes[1].node.get_and_clear_pending_events();
+	assert_eq!(events.len(), 1);
+	let intercept_id = match events[0] {
+		crate::events::Event::HTLCIntercepted {
+			intercept_id, payment_hash: pmt_hash,
+			requested_next_hop_scid: short_channel_id, ..
+		} => {
+			assert_eq!(pmt_hash, payment_hash);
+			assert_eq!(short_channel_id, intercept_scid);
+			intercept_id
+		},
+			_ => panic!()
+	};
+
+	nodes[1].node.fail_intercepted_htlc(intercept_id).unwrap();
+	expect_pending_htlcs_forwardable_and_htlc_handling_failed_ignore!(nodes[1], vec![HTLCDestination::UnknownNextHop { requested_forward_scid: intercept_scid }]);
+	nodes[1].node.process_pending_htlc_forwards();
+	let update_fail = get_htlc_update_msgs!(nodes[1], nodes[0].node.get_our_node_id());
+	check_added_monitors!(&nodes[1], 1);
+	assert!(update_fail.update_fail_htlcs.len() == 1);
+	let fail_msg = update_fail.update_fail_htlcs[0].clone();
+	nodes[0].node.handle_update_fail_htlc(&nodes[1].node.get_our_node_id(), &fail_msg);
+	commitment_signed_dance!(nodes[0], nodes[1], update_fail.commitment_signed, false);
+	expect_payment_failed_conditions(&nodes[0], payment_hash, false,
+		PaymentFailedConditions::new().expected_htlc_error_data(INVALID_ONION_BLINDING, &[0; 32]));
+}