f - create_invoice_request_builder

Author: jkczyz

lightning/src/ln/channelmanager.rs

@@ -56,7 +56,8 @@ use crate::ln::outbound_payment;
 use crate::ln::outbound_payment::{OutboundPayments, PaymentAttempts, PendingOutboundPayment, Retry};
 use crate::ln::wire::Encode;
 use crate::chain::keysinterface::{EntropySource, KeysManager, NodeSigner, Recipient, SignerProvider, ChannelSigner};
-use crate::offers::offer::OfferBuilder;
+use crate::offers::invoice_request::InvoiceRequestBuilder;
+use crate::offers::offer::{Offer, OfferBuilder};
 use crate::offers::parse::SemanticError;
 use crate::offers::refund::RefundBuilder;
 use crate::offers::signer::DerivedPubkey;
@@ -5352,6 +5353,21 @@ where
 		RefundBuilder::deriving_payer_id(description, payer_id, amount_msats)
 	}
 
+	/// Creates an [`InvoiceRequestBuilder`] such that the [`InvoiceRequest`] it builds is
+	/// recognized by the [`OnionMessenger`] when handling [`Invoice`] messages for the request.
+	///
+	/// [`OnionMessenger`]: crate::onion_message::OnionMessenger
+	/// [`InvoiceRequest`]: crate::offers::invoice_request::InvoiceRequest
+	/// [`Invoice`]: crate::offers::invoice::Invoice
+	pub fn create_invoice_request_builder<'a>(
+		&self, offer: &'a Offer
+	) -> Result<InvoiceRequestBuilder<'a>, SemanticError> {
+		let nonce = inbound_payment::Nonce::from_entropy_source(&*self.entropy_source);
+		let payer_id = DerivedPubkey::new(&self.inbound_payment_key, nonce);
+
+		offer.request_invoice_deriving_payer_id(payer_id)
+	}
+
 	/// Gets a payment secret and payment hash for use in an invoice given to a third party wishing
 	/// to pay us.
 	///