From c9f52f43ea1e41af1d612f3a9bf657eed943fe71 Mon Sep 17 00:00:00 2001
From: shaavan <shaavan.github@gmail.com>
Date: Mon, 16 Sep 2024 16:11:07 +0530
Subject: [PATCH] Introduce test for check asynchronous Invoice Request
 Response

---
 lightning/src/ln/offers_tests.rs         | 72 ++++++++++++++++++++++++
 lightning/src/onion_message/messenger.rs |  2 +-
 2 files changed, 73 insertions(+), 1 deletion(-)

diff --git a/lightning/src/ln/offers_tests.rs b/lightning/src/ln/offers_tests.rs
index 44ba2cd7492..f4797a8b284 100644
--- a/lightning/src/ln/offers_tests.rs
+++ b/lightning/src/ln/offers_tests.rs
@@ -1226,6 +1226,78 @@ fn pays_bolt12_invoice_asynchronously() {
 	);
 }
 
+#[test]
+fn send_invoice_request_response_asynchronously() {
+	let mut manually_respond_cfg = test_default_channel_config();
+	manually_respond_cfg.manually_handle_bolt12_messages = true;
+
+	let chanmon_cfgs = create_chanmon_cfgs(2);
+	let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
+	let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[Some(manually_respond_cfg), None]);
+	let nodes = create_network(2, &node_cfgs, &node_chanmgrs);
+
+	create_announced_chan_between_nodes_with_value(&nodes, 0, 1, 10_000_000, 1_000_000_000);
+
+	let alice = &nodes[0];
+	let alice_id = alice.node.get_our_node_id();
+	let bob = &nodes[1];
+	let bob_id = bob.node.get_our_node_id();
+
+	let offer = alice.node
+		.create_offer_builder(None).unwrap()
+		.amount_msats(10_000_000)
+		.build().unwrap();
+
+	let payment_id = PaymentId([1; 32]);
+	bob.node.pay_for_offer(&offer, None, None, None, payment_id, Retry::Attempts(0), None).unwrap();
+	expect_recent_payment!(bob, RecentPaymentDetails::AwaitingInvoice, payment_id);
+
+	let onion_message = bob.onion_messenger.next_onion_message_for_peer(alice_id).unwrap();
+	alice.onion_messenger.handle_onion_message(bob_id, &onion_message);
+
+	let (invoice_request, context, responder) = match get_event!(alice, Event::InvoiceRequestReceived) {
+		Event::InvoiceRequestReceived { invoice_request, context, responder } => {
+			(invoice_request, context, responder)
+		}
+		_ => panic!("No Event::InvoiceReceived"),
+	};
+
+	let payment_context = PaymentContext::Bolt12Offer(Bolt12OfferContext {
+		offer_id: offer.id(),
+		invoice_request: InvoiceRequestFields {
+			payer_id: invoice_request.payer_id(),
+			quantity: None,
+			payer_note_truncated: None,
+		},
+	});
+
+	assert_eq!(invoice_request.amount_msats(), None);
+	assert_ne!(invoice_request.payer_id(), bob_id);
+	assert_eq!(responder.as_ref().unwrap().reply_path.introduction_node(), &IntroductionNode::NodeId(bob_id));
+
+	match alice.node.send_invoice_request_response(invoice_request, context, None, responder.unwrap()) {
+		Ok(()) => (),
+		Err(_) => panic!("Unexpected Error.")
+	}
+
+	let onion_message = alice.onion_messenger.next_onion_message_for_peer(bob_id).unwrap();
+	bob.onion_messenger.handle_onion_message(alice_id, &onion_message);
+
+	let (invoice, _) = extract_invoice(bob, &onion_message);
+	assert_eq!(invoice.amount_msats(), 10_000_000);
+	assert_ne!(invoice.signing_pubkey(), alice_id);
+	assert!(!invoice.payment_paths().is_empty());
+	for path in invoice.payment_paths() {
+		assert_eq!(path.introduction_node(), &IntroductionNode::NodeId(alice_id));
+	}
+
+	route_bolt12_payment(bob, &[alice], &invoice);
+	expect_recent_payment!(bob, RecentPaymentDetails::Pending, payment_id);
+
+	claim_bolt12_payment(bob, &[alice], payment_context);
+	expect_recent_payment!(bob, RecentPaymentDetails::Fulfilled, payment_id);
+}
+
 /// Checks that an offer can be created using an unannounced node as a blinded path's introduction
 /// node. This is only preferred if there are no other options which may indicated either the offer
 /// is intended for the unannounced node or that the node is actually announced (e.g., an LSP) but
diff --git a/lightning/src/onion_message/messenger.rs b/lightning/src/onion_message/messenger.rs
index 1c07042d8e8..5d33ab619ac 100644
--- a/lightning/src/onion_message/messenger.rs
+++ b/lightning/src/onion_message/messenger.rs
@@ -347,7 +347,7 @@ impl OnionMessageRecipient {
 #[derive(Clone, Debug, Eq, PartialEq)]
 pub struct Responder {
 	/// The path along which a response can be sent.
-	reply_path: BlindedMessagePath,
+	pub(crate) reply_path: BlindedMessagePath,
 }
 
 impl_writeable_tlv_based!(Responder, {