Offers builders for C-bindings

fuzz/src/invoice_request_deser.rs

@@ -9,7 +9,7 @@
 
 use bitcoin::secp256k1::{KeyPair, Parity, PublicKey, Secp256k1, SecretKey, self};
 use crate::utils::test_logger;
-use core::convert::{Infallible, TryFrom};
+use core::convert::TryFrom;
 use lightning::blinded_path::BlindedPath;
 use lightning::sign::EntropySource;
 use lightning::ln::PaymentHash;
@@ -37,16 +37,16 @@ pub fn do_test<Out: test_logger::Output>(data: &[u8], _out: Out) {
 			let even_pubkey = x_only_pubkey.public_key(Parity::Even);
 			if signing_pubkey == odd_pubkey || signing_pubkey == even_pubkey {
 				unsigned_invoice
-					.sign::<_, Infallible>(
-						|message| Ok(secp_ctx.sign_schnorr_no_aux_rand(message.as_ref().as_digest(), &keys))
+					.sign(|message: &UnsignedBolt12Invoice|
+						Ok(secp_ctx.sign_schnorr_no_aux_rand(message.as_ref().as_digest(), &keys))
 					)
 					.unwrap()
 					.write(&mut buffer)
 					.unwrap();
 			} else {
 				unsigned_invoice
-					.sign::<_, Infallible>(
-						|message| Ok(secp_ctx.sign_schnorr_no_aux_rand(message.as_ref().as_digest(), &keys))
+					.sign(|message: &UnsignedBolt12Invoice|
+						Ok(secp_ctx.sign_schnorr_no_aux_rand(message.as_ref().as_digest(), &keys))
 					)
 					.unwrap_err();
 			}

fuzz/src/offer_deser.rs

@@ -9,7 +9,7 @@
 
 use bitcoin::secp256k1::{KeyPair, PublicKey, Secp256k1, SecretKey};
 use crate::utils::test_logger;
-use core::convert::{Infallible, TryFrom};
+use core::convert::TryFrom;
 use lightning::offers::invoice_request::UnsignedInvoiceRequest;
 use lightning::offers::offer::{Amount, Offer, Quantity};
 use lightning::offers::parse::Bolt12SemanticError;
@@ -29,8 +29,8 @@ pub fn do_test<Out: test_logger::Output>(data: &[u8], _out: Out) {
 
 		if let Ok(invoice_request) = build_response(&offer, pubkey) {
 			invoice_request
-				.sign::<_, Infallible>(
-					|message| Ok(secp_ctx.sign_schnorr_no_aux_rand(message.as_ref().as_digest(), &keys))
+				.sign(|message: &UnsignedInvoiceRequest|
+					Ok(secp_ctx.sign_schnorr_no_aux_rand(message.as_ref().as_digest(), &keys))
 				)
 				.unwrap()
 				.write(&mut buffer)

fuzz/src/refund_deser.rs

@@ -9,7 +9,7 @@
 
 use bitcoin::secp256k1::{KeyPair, PublicKey, Secp256k1, SecretKey, self};
 use crate::utils::test_logger;
-use core::convert::{Infallible, TryFrom};
+use core::convert::TryFrom;
 use lightning::blinded_path::BlindedPath;
 use lightning::sign::EntropySource;
 use lightning::ln::PaymentHash;
@@ -33,8 +33,8 @@ pub fn do_test<Out: test_logger::Output>(data: &[u8], _out: Out) {
 
 		if let Ok(invoice) = build_response(&refund, pubkey, &secp_ctx) {
 			invoice
-				.sign::<_, Infallible>(
-					|message| Ok(secp_ctx.sign_schnorr_no_aux_rand(message.as_ref().as_digest(), &keys))
+				.sign(|message: &UnsignedBolt12Invoice|
+					Ok(secp_ctx.sign_schnorr_no_aux_rand(message.as_ref().as_digest(), &keys))
 				)
 				.unwrap()
 				.write(&mut buffer)

lightning/src/crypto/mod.rs

@@ -1,3 +1,4 @@
+#[cfg(not(fuzzing))]
 use bitcoin::hashes::cmp::fixed_time_eq;
 
 pub(crate) mod chacha20;

lightning/src/ln/channelmanager.rs

@@ -57,10 +57,11 @@ use crate::ln::msgs::{ChannelMessageHandler, DecodeError, LightningError};
 use crate::ln::outbound_payment;
 use crate::ln::outbound_payment::{Bolt12PaymentError, OutboundPayments, PaymentAttempts, PendingOutboundPayment, SendAlongPathArgs, StaleExpiration};
 use crate::ln::wire::Encode;
-use crate::offers::invoice::{BlindedPayInfo, Bolt12Invoice, DEFAULT_RELATIVE_EXPIRY, DerivedSigningPubkey, InvoiceBuilder};
+use crate::offers::invoice::{BlindedPayInfo, Bolt12Invoice, DEFAULT_RELATIVE_EXPIRY, DerivedSigningPubkey, ExplicitSigningPubkey, InvoiceBuilder, UnsignedBolt12Invoice};
 use crate::offers::invoice_error::InvoiceError;
+use crate::offers::invoice_request::{DerivedPayerId, InvoiceRequestBuilder};
 use crate::offers::merkle::SignError;
-use crate::offers::offer::{DerivedMetadata, Offer, OfferBuilder};
+use crate::offers::offer::{Offer, OfferBuilder};
 use crate::offers::parse::Bolt12SemanticError;
 use crate::offers::refund::{Refund, RefundBuilder};
 use crate::onion_message::messenger::{Destination, MessageRouter, PendingOnionMessage, new_pending_onion_message};
@@ -76,11 +77,17 @@ use crate::util::logger::{Level, Logger, WithContext};
 use crate::util::errors::APIError;
 #[cfg(not(c_bindings))]
 use {
+	crate::offers::offer::DerivedMetadata,
 	crate::routing::router::DefaultRouter,
 	crate::routing::gossip::NetworkGraph,
 	crate::routing::scoring::{ProbabilisticScorer, ProbabilisticScoringFeeParameters},
 	crate::sign::KeysManager,
 };
+#[cfg(c_bindings)]
+use {
+	crate::offers::offer::OfferWithDerivedMetadataBuilder,
+	crate::offers::refund::RefundMaybeWithDerivedMetadataBuilder,
+};
 
 use alloc::collections::{btree_map, BTreeMap};
 
@@ -7520,7 +7527,9 @@ where
 			self.finish_close_channel(failure);
 		}
 	}
+}
 
+macro_rules! create_offer_builder { ($self: ident, $builder: ty) => {
 	/// Creates an [`OfferBuilder`] such that the [`Offer`] it builds is recognized by the
 	/// [`ChannelManager`] when handling [`InvoiceRequest`] messages for the offer. The offer will
 	/// not have an expiration unless otherwise set on the builder.
@@ -7549,23 +7558,25 @@ where
 	/// [`Offer`]: crate::offers::offer::Offer
 	/// [`InvoiceRequest`]: crate::offers::invoice_request::InvoiceRequest
 	pub fn create_offer_builder(
-		&self, description: String
-	) -> Result<OfferBuilder<DerivedMetadata, secp256k1::All>, Bolt12SemanticError> {
-		let node_id = self.get_our_node_id();
-		let expanded_key = &self.inbound_payment_key;
-		let entropy = &*self.entropy_source;
-		let secp_ctx = &self.secp_ctx;
-
-		let path = self.create_blinded_path().map_err(|_| Bolt12SemanticError::MissingPaths)?;
+		&$self, description: String
+	) -> Result<$builder, Bolt12SemanticError> {
+		let node_id = $self.get_our_node_id();
+		let expanded_key = &$self.inbound_payment_key;
+		let entropy = &*$self.entropy_source;
+		let secp_ctx = &$self.secp_ctx;
+
+		let path = $self.create_blinded_path().map_err(|_| Bolt12SemanticError::MissingPaths)?;
 		let builder = OfferBuilder::deriving_signing_pubkey(
 			description, node_id, expanded_key, entropy, secp_ctx
 		)
-			.chain_hash(self.chain_hash)
+			.chain_hash($self.chain_hash)
 			.path(path);
 
-		Ok(builder)
+		Ok(builder.into())
 	}
+} }
 
+macro_rules! create_refund_builder { ($self: ident, $builder: ty) => {
 	/// Creates a [`RefundBuilder`] such that the [`Refund`] it builds is recognized by the
 	/// [`ChannelManager`] when handling [`Bolt12Invoice`] messages for the refund.
 	///
@@ -7615,31 +7626,53 @@ where
 	/// [`Bolt12Invoice::payment_paths`]: crate::offers::invoice::Bolt12Invoice::payment_paths
 	/// [Avoiding Duplicate Payments]: #avoiding-duplicate-payments
 	pub fn create_refund_builder(
-		&self, description: String, amount_msats: u64, absolute_expiry: Duration,
+		&$self, description: String, amount_msats: u64, absolute_expiry: Duration,
 		payment_id: PaymentId, retry_strategy: Retry, max_total_routing_fee_msat: Option<u64>
-	) -> Result<RefundBuilder<secp256k1::All>, Bolt12SemanticError> {
-		let node_id = self.get_our_node_id();
-		let expanded_key = &self.inbound_payment_key;
-		let entropy = &*self.entropy_source;
-		let secp_ctx = &self.secp_ctx;
+	) -> Result<$builder, Bolt12SemanticError> {
+		let node_id = $self.get_our_node_id();
+		let expanded_key = &$self.inbound_payment_key;
+		let entropy = &*$self.entropy_source;
+		let secp_ctx = &$self.secp_ctx;
 
-		let path = self.create_blinded_path().map_err(|_| Bolt12SemanticError::MissingPaths)?;
+		let path = $self.create_blinded_path().map_err(|_| Bolt12SemanticError::MissingPaths)?;
 		let builder = RefundBuilder::deriving_payer_id(
 			description, node_id, expanded_key, entropy, secp_ctx, amount_msats, payment_id
 		)?
-			.chain_hash(self.chain_hash)
+			.chain_hash($self.chain_hash)
 			.absolute_expiry(absolute_expiry)
 			.path(path);
 
 		let expiration = StaleExpiration::AbsoluteTimeout(absolute_expiry);
-		self.pending_outbound_payments
+		$self.pending_outbound_payments
 			.add_new_awaiting_invoice(
 				payment_id, expiration, retry_strategy, max_total_routing_fee_msat,
 			)
 			.map_err(|_| Bolt12SemanticError::DuplicatePaymentId)?;
 
-		Ok(builder)
+		Ok(builder.into())
 	}
+} }
+
+impl<M: Deref, T: Deref, ES: Deref, NS: Deref, SP: Deref, F: Deref, R: Deref, L: Deref> ChannelManager<M, T, ES, NS, SP, F, R, L>
+where
+	M::Target: chain::Watch<<SP::Target as SignerProvider>::EcdsaSigner>,
+	T::Target: BroadcasterInterface,
+	ES::Target: EntropySource,
+	NS::Target: NodeSigner,
+	SP::Target: SignerProvider,
+	F::Target: FeeEstimator,
+	R::Target: Router,
+	L::Target: Logger,
+{
+	#[cfg(not(c_bindings))]
+	create_offer_builder!(self, OfferBuilder<DerivedMetadata, secp256k1::All>);
+	#[cfg(not(c_bindings))]
+	create_refund_builder!(self, RefundBuilder<secp256k1::All>);
+
+	#[cfg(c_bindings)]
+	create_offer_builder!(self, OfferWithDerivedMetadataBuilder);
+	#[cfg(c_bindings)]
+	create_refund_builder!(self, RefundMaybeWithDerivedMetadataBuilder);
 
 	/// Pays for an [`Offer`] using the given parameters by creating an [`InvoiceRequest`] and
 	/// enqueuing it to be sent via an onion message. [`ChannelManager`] will pay the actual
@@ -7703,9 +7736,11 @@ where
 		let entropy = &*self.entropy_source;
 		let secp_ctx = &self.secp_ctx;
 
-		let builder = offer
+		let builder: InvoiceRequestBuilder<DerivedPayerId, secp256k1::All> = offer
 			.request_invoice_deriving_payer_id(expanded_key, entropy, secp_ctx, payment_id)?
-			.chain_hash(self.chain_hash)?;
+			.into();
+		let builder = builder.chain_hash(self.chain_hash)?;
+
 		let builder = match quantity {
 			None => builder,
 			Some(quantity) => builder.quantity(quantity)?,
@@ -7799,6 +7834,7 @@ where
 				let builder = refund.respond_using_derived_keys_no_std(
 					payment_paths, payment_hash, created_at, expanded_key, entropy
 				)?;
+				let builder: InvoiceBuilder<DerivedSigningPubkey> = builder.into();
 				let invoice = builder.allow_mpp().build_and_sign(secp_ctx)?;
 				let reply_path = self.create_blinded_path()
 					.map_err(|_| Bolt12SemanticError::MissingPaths)?;
@@ -9246,6 +9282,8 @@ where
 					let builder = invoice_request.respond_using_derived_keys_no_std(
 						payment_paths, payment_hash, created_at
 					);
+					let builder: Result<InvoiceBuilder<DerivedSigningPubkey>, _> =
+						builder.map(|b| b.into());
 					match builder.and_then(|b| b.allow_mpp().build_and_sign(secp_ctx)) {
 						Ok(invoice) => Some(OffersMessage::Invoice(invoice)),
 						Err(error) => Some(OffersMessage::InvoiceError(error.into())),
@@ -9257,18 +9295,25 @@ where
 					let builder = invoice_request.respond_with_no_std(
 						payment_paths, payment_hash, created_at
 					);
+					let builder: Result<InvoiceBuilder<ExplicitSigningPubkey>, _> =
+						builder.map(|b| b.into());
 					let response = builder.and_then(|builder| builder.allow_mpp().build())
 						.map_err(|e| OffersMessage::InvoiceError(e.into()))
-						.and_then(|invoice|
-							match invoice.sign(|invoice| self.node_signer.sign_bolt12_invoice(invoice)) {
+						.and_then(|invoice| {
+							#[cfg(c_bindings)]
+							let mut invoice = invoice;
+							match invoice.sign(|invoice: &UnsignedBolt12Invoice|
+								self.node_signer.sign_bolt12_invoice(invoice)
+							) {
 								Ok(invoice) => Ok(OffersMessage::Invoice(invoice)),
-								Err(SignError::Signing(())) => Err(OffersMessage::InvoiceError(
+								Err(SignError::Signing) => Err(OffersMessage::InvoiceError(
 										InvoiceError::from_string("Failed signing invoice".to_string())
 								)),
 								Err(SignError::Verification(_)) => Err(OffersMessage::InvoiceError(
 										InvoiceError::from_string("Failed invoice signature verification".to_string())
 								)),
-							});
+							}
+						});
 					match response {
 						Ok(invoice) => Some(invoice),
 						Err(error) => Some(error),