Pass full message context into ChanMan blinded path util.

Allows us to repurpose this util to create blinded paths in an async payments
message context while maintaining support for the offers context.

Author: valentinewallace

lightning/src/ln/channelmanager.rs

@@ -9131,7 +9131,9 @@ where
 		let invoice_request = builder.build_and_sign()?;
 
 		let hmac = payment_id.hmac_for_offer_payment(nonce, expanded_key);
-		let context = OffersContext::OutboundPayment { payment_id, nonce, hmac: Some(hmac) };
+		let context = MessageContext::Offers(
+			OffersContext::OutboundPayment { payment_id, nonce, hmac: Some(hmac) }
+		);
 		let reply_paths = self.create_blinded_paths(context)
 			.map_err(|_| Bolt12SemanticError::MissingPaths)?;
 
@@ -9251,9 +9253,9 @@ where
 
 				let nonce = Nonce::from_entropy_source(entropy);
 				let hmac = payment_hash.hmac_for_offer_payment(nonce, expanded_key);
-				let context = OffersContext::InboundPayment {
+				let context = MessageContext::Offers(OffersContext::InboundPayment {
 					payment_hash: invoice.payment_hash(), nonce, hmac
-				};
+				});
 				let reply_paths = self.create_blinded_paths(context)
 					.map_err(|_| Bolt12SemanticError::MissingPaths)?;
 
@@ -9401,7 +9403,7 @@ where
 		if absolute_expiry.unwrap_or(Duration::MAX) <= max_short_lived_absolute_expiry {
 			self.create_compact_blinded_paths(context)
 		} else {
-			self.create_blinded_paths(context)
+			self.create_blinded_paths(MessageContext::Offers(context))
 		}
 	}
 
@@ -9422,7 +9424,7 @@ where
 	/// [`MessageRouter::create_blinded_paths`].
 	///
 	/// Errors if the `MessageRouter` errors.
-	fn create_blinded_paths(&self, context: OffersContext) -> Result<Vec<BlindedMessagePath>, ()> {
+	fn create_blinded_paths(&self, context: MessageContext) -> Result<Vec<BlindedMessagePath>, ()> {
 		let recipient = self.get_our_node_id();
 		let secp_ctx = &self.secp_ctx;
 
@@ -9435,7 +9437,7 @@ where
 			.collect::<Vec<_>>();
 
 		self.router
-			.create_blinded_paths(recipient, MessageContext::Offers(context), peers, secp_ctx)
+			.create_blinded_paths(recipient, context, peers, secp_ctx)
 			.and_then(|paths| (!paths.is_empty()).then(|| paths).ok_or(()))
 	}
 
@@ -10839,11 +10841,11 @@ where
 		{
 			let RetryableInvoiceRequest { invoice_request, nonce } = retryable_invoice_request;
 			let hmac = payment_id.hmac_for_offer_payment(nonce, &self.inbound_payment_key);
-			let context = OffersContext::OutboundPayment {
+			let context = MessageContext::Offers(OffersContext::OutboundPayment {
 				payment_id,
 				nonce,
 				hmac: Some(hmac)
-			};
+			});
 			match self.create_blinded_paths(context) {
 				Ok(reply_paths) => match self.enqueue_invoice_request(invoice_request, reply_paths) {
 					Ok(_) => {}