Rename Refund::payer_id

For consistency with Offer::issuer_signing_pubkey, rename
Refund::payer_id to use "signing_pubkey" instead of "id".

lightning/src/ln/channelmanager.rs

@@ -9115,7 +9115,7 @@ macro_rules! create_refund_builder { ($self: ident, $builder: ty) => {
 			.and_then(|paths| paths.into_iter().next().ok_or(()))
 			.map_err(|_| Bolt12SemanticError::MissingPaths)?;
 
-		let builder = RefundBuilder::deriving_payer_id(
+		let builder = RefundBuilder::deriving_signing_pubkey(
 			node_id, expanded_key, nonce, secp_ctx, amount_msats, payment_id
 		)?
 			.chain_hash($self.chain_hash)
@@ -9315,9 +9315,9 @@ where
 	/// # Limitations
 	///
 	/// Requires a direct connection to an introduction node in [`Refund::paths`] or to
-	/// [`Refund::payer_id`], if empty. This request is best effort; an invoice will be sent to each
-	/// node meeting the aforementioned criteria, but there's no guarantee that they will be
-	/// received and no retries will be made.
+	/// [`Refund::payer_signing_pubkey`], if empty. This request is best effort; an invoice will be
+	/// sent to each node meeting the aforementioned criteria, but there's no guarantee that they
+	/// will be received and no retries will be made.
 	///
 	/// # Errors
 	///
@@ -9378,7 +9378,7 @@ where
 				if refund.paths().is_empty() {
 					for reply_path in reply_paths {
 						let instructions = MessageSendInstructions::WithSpecifiedReplyPath {
-							destination: Destination::Node(refund.payer_id()),
+							destination: Destination::Node(refund.payer_signing_pubkey()),
 							reply_path,
 						};
 						let message = OffersMessage::Invoice(invoice.clone());

lightning/src/ln/offers_tests.rs

@@ -651,7 +651,7 @@ fn creates_and_pays_for_refund_using_two_hop_blinded_path() {
 		.build().unwrap();
 	assert_eq!(refund.amount_msats(), 10_000_000);
 	assert_eq!(refund.absolute_expiry(), Some(absolute_expiry));
-	assert_ne!(refund.payer_id(), david_id);
+	assert_ne!(refund.payer_signing_pubkey(), david_id);
 	assert!(!refund.paths().is_empty());
 	for path in refund.paths() {
 		assert_eq!(path.introduction_node(), &IntroductionNode::NodeId(charlie_id));
@@ -779,7 +779,7 @@ fn creates_and_pays_for_refund_using_one_hop_blinded_path() {
 		.build().unwrap();
 	assert_eq!(refund.amount_msats(), 10_000_000);
 	assert_eq!(refund.absolute_expiry(), Some(absolute_expiry));
-	assert_ne!(refund.payer_id(), bob_id);
+	assert_ne!(refund.payer_signing_pubkey(), bob_id);
 	assert!(!refund.paths().is_empty());
 	for path in refund.paths() {
 		assert_eq!(path.introduction_node(), &IntroductionNode::NodeId(bob_id));
@@ -886,7 +886,7 @@ fn pays_for_refund_without_blinded_paths() {
 		.unwrap()
 		.clear_paths()
 		.build().unwrap();
-	assert_eq!(refund.payer_id(), bob_id);
+	assert_eq!(refund.payer_signing_pubkey(), bob_id);
 	assert!(refund.paths().is_empty());
 	expect_recent_payment!(bob, RecentPaymentDetails::AwaitingInvoice, payment_id);
 
@@ -1040,7 +1040,7 @@ fn send_invoice_for_refund_with_distinct_reply_path() {
 		.create_refund_builder(10_000_000, absolute_expiry, payment_id, Retry::Attempts(0), None)
 		.unwrap()
 		.build().unwrap();
-	assert_ne!(refund.payer_id(), alice_id);
+	assert_ne!(refund.payer_signing_pubkey(), alice_id);
 	for path in refund.paths() {
 		assert_eq!(path.introduction_node(), &IntroductionNode::NodeId(bob_id));
 	}
@@ -1315,7 +1315,7 @@ fn creates_refund_with_blinded_path_using_unannounced_introduction_node() {
 		.create_refund_builder(10_000_000, absolute_expiry, payment_id, Retry::Attempts(0), None)
 		.unwrap()
 		.build().unwrap();
-	assert_ne!(refund.payer_id(), bob_id);
+	assert_ne!(refund.payer_signing_pubkey(), bob_id);
 	assert!(!refund.paths().is_empty());
 	for path in refund.paths() {
 		assert_eq!(path.introduction_node(), &IntroductionNode::NodeId(alice_id));
@@ -1598,7 +1598,7 @@ fn fails_authentication_when_handling_invoice_for_refund() {
 		.create_refund_builder(10_000_000, absolute_expiry, payment_id, Retry::Attempts(0), None)
 		.unwrap()
 		.build().unwrap();
-	assert_ne!(refund.payer_id(), david_id);
+	assert_ne!(refund.payer_signing_pubkey(), david_id);
 	assert!(!refund.paths().is_empty());
 	for path in refund.paths() {
 		assert_eq!(path.introduction_node(), &IntroductionNode::NodeId(charlie_id));
@@ -1632,7 +1632,7 @@ fn fails_authentication_when_handling_invoice_for_refund() {
 		.create_refund_builder(10_000_000, absolute_expiry, payment_id, Retry::Attempts(0), None)
 		.unwrap()
 		.build().unwrap();
-	assert_ne!(refund.payer_id(), david_id);
+	assert_ne!(refund.payer_signing_pubkey(), david_id);
 	assert!(!refund.paths().is_empty());
 	for path in refund.paths() {
 		assert_eq!(path.introduction_node(), &IntroductionNode::NodeId(charlie_id));

lightning/src/offers/invoice.rs

@@ -1019,8 +1019,8 @@ impl InvoiceContents {
 
 	fn payer_signing_pubkey(&self) -> PublicKey {
 		match self {
-			InvoiceContents::ForRefund { refund, .. } => refund.payer_id(),
 			InvoiceContents::ForOffer { invoice_request, .. } => invoice_request.payer_signing_pubkey(),
+			InvoiceContents::ForRefund { refund, .. } => refund.payer_signing_pubkey(),
 		}
 	}
 

lightning/src/offers/invoice_request.rs

@@ -1054,9 +1054,10 @@ impl Readable for InvoiceRequest {
 /// Valid type range for invoice_request TLV records.
 pub(super) const INVOICE_REQUEST_TYPES: core::ops::Range<u64> = 80..160;
 
-/// TLV record type for [`InvoiceRequest::payer_signing_pubkey`] and [`Refund::payer_id`].
+/// TLV record type for [`InvoiceRequest::payer_signing_pubkey`] and
+/// [`Refund::payer_signing_pubkey`].
 ///
-/// [`Refund::payer_id`]: crate::offers::refund::Refund::payer_id
+/// [`Refund::payer_signing_pubkey`]: crate::offers::refund::Refund::payer_signing_pubkey
 pub(super) const INVOICE_REQUEST_PAYER_ID_TYPE: u64 = 88;
 
 // This TLV stream is used for both InvoiceRequest and Refund, but not all TLV records are valid for

lightning/src/offers/payer.rs

@@ -16,9 +16,10 @@ use crate::util::ser::WithoutLength;
 use crate::prelude::*;
 
 /// An unpredictable sequence of bytes typically containing information needed to derive
-/// [`InvoiceRequest::payer_signing_pubkey`].
+/// [`InvoiceRequest::payer_signing_pubkey`] and [`Refund::payer_signing_pubkey`].
 ///
 /// [`InvoiceRequest::payer_signing_pubkey`]: crate::offers::invoice_request::InvoiceRequest::payer_signing_pubkey
+/// [`Refund::payer_signing_pubkey`]: crate::offers::refund::Refund::payer_signing_pubkey
 #[derive(Clone, Debug)]
 #[cfg_attr(test, derive(PartialEq))]
 pub(super) struct PayerContents(pub Metadata);

lightning/src/offers/refund.rs

@@ -150,8 +150,8 @@ pub struct RefundMaybeWithDerivedMetadataBuilder<'a> {
 }
 
 macro_rules! refund_explicit_metadata_builder_methods { () => {
-	/// Creates a new builder for a refund using the [`Refund::payer_id`] for the public node id to
-	/// send to if no [`Refund::paths`] are set. Otherwise, it may be a transient pubkey.
+	/// Creates a new builder for a refund using the `signing_pubkey` for the public node id to send
+	/// to if no [`Refund::paths`] are set. Otherwise, `signing_pubkey` may be a transient pubkey.
 	///
 	/// Additionally, sets the required (empty) [`Refund::description`], [`Refund::payer_metadata`],
 	/// and [`Refund::amount_msats`].
@@ -164,7 +164,7 @@ macro_rules! refund_explicit_metadata_builder_methods { () => {
 	/// [`ChannelManager`]: crate::ln::channelmanager::ChannelManager
 	/// [`ChannelManager::create_refund_builder`]: crate::ln::channelmanager::ChannelManager::create_refund_builder
 	pub fn new(
-		metadata: Vec<u8>, payer_id: PublicKey, amount_msats: u64
+		metadata: Vec<u8>, signing_pubkey: PublicKey, amount_msats: u64
 	) -> Result<Self, Bolt12SemanticError> {
 		if amount_msats > MAX_VALUE_MSAT {
 			return Err(Bolt12SemanticError::InvalidAmount);
@@ -175,7 +175,7 @@ macro_rules! refund_explicit_metadata_builder_methods { () => {
 			refund: RefundContents {
 				payer: PayerContents(metadata), description: String::new(), absolute_expiry: None,
 				issuer: None, chain: None, amount_msats, features: InvoiceRequestFeatures::empty(),
-				quantity: None, payer_id, payer_note: None, paths: None,
+				quantity: None, payer_signing_pubkey: signing_pubkey, payer_note: None, paths: None,
 			},
 			secp_ctx: None,
 		})
@@ -202,7 +202,7 @@ macro_rules! refund_builder_methods { (
 	/// [`Bolt12Invoice::verify_using_metadata`]: crate::offers::invoice::Bolt12Invoice::verify_using_metadata
 	/// [`Bolt12Invoice::verify_using_payer_data`]: crate::offers::invoice::Bolt12Invoice::verify_using_payer_data
 	/// [`ExpandedKey`]: crate::ln::inbound_payment::ExpandedKey
-	pub fn deriving_payer_id(
+	pub fn deriving_signing_pubkey(
 		node_id: PublicKey, expanded_key: &ExpandedKey, nonce: Nonce,
 		secp_ctx: &'a Secp256k1<$secp_context>, amount_msats: u64, payment_id: PaymentId
 	) -> Result<Self, Bolt12SemanticError> {
@@ -217,7 +217,7 @@ macro_rules! refund_builder_methods { (
 			refund: RefundContents {
 				payer: PayerContents(metadata), description: String::new(), absolute_expiry: None,
 				issuer: None, chain: None, amount_msats, features: InvoiceRequestFeatures::empty(),
-				quantity: None, payer_id: node_id, payer_note: None, paths: None,
+				quantity: None, payer_signing_pubkey: node_id, payer_note: None, paths: None,
 			},
 			secp_ctx: Some(secp_ctx),
 		})
@@ -249,7 +249,7 @@ macro_rules! refund_builder_methods { (
 	}
 
 	/// Adds a blinded path to [`Refund::paths`]. Must include at least one path if only connected
-	/// by private channels or if [`Refund::payer_id`] is not a public node id.
+	/// by private channels or if [`Refund::payer_signing_pubkey`] is not a public node id.
 	///
 	/// Successive calls to this method will add another blinded path. Caller is responsible for not
 	/// adding duplicate paths.
@@ -324,7 +324,7 @@ macro_rules! refund_builder_methods { (
 				metadata.derive_from(iv_bytes, tlv_stream, $self.secp_ctx);
 			metadata = derived_metadata;
 			if let Some(keys) = keys {
-				$self.refund.payer_id = keys.public_key();
+				$self.refund.payer_signing_pubkey = keys.public_key();
 			}
 
 			$self.refund.payer.0 = metadata;
@@ -434,7 +434,7 @@ pub(super) struct RefundContents {
 	amount_msats: u64,
 	features: InvoiceRequestFeatures,
 	quantity: Option<u64>,
-	payer_id: PublicKey,
+	payer_signing_pubkey: PublicKey,
 	payer_note: Option<String>,
 	paths: Option<Vec<BlindedMessagePath>>,
 }
@@ -477,9 +477,9 @@ impl Refund {
 	}
 
 	/// An unpredictable series of bytes, typically containing information about the derivation of
-	/// [`payer_id`].
+	/// [`payer_signing_pubkey`].
 	///
-	/// [`payer_id`]: Self::payer_id
+	/// [`payer_signing_pubkey`]: Self::payer_signing_pubkey
 	pub fn payer_metadata(&self) -> &[u8] {
 		self.contents.metadata()
 	}
@@ -510,8 +510,8 @@ impl Refund {
 	/// transient pubkey.
 	///
 	/// [`paths`]: Self::paths
-	pub fn payer_id(&self) -> PublicKey {
-		self.contents.payer_id()
+	pub fn payer_signing_pubkey(&self) -> PublicKey {
+		self.contents.payer_signing_pubkey()
 	}
 
 	/// Payer provided note to include in the invoice.
@@ -727,8 +727,8 @@ impl RefundContents {
 	/// transient pubkey.
 	///
 	/// [`paths`]: Self::paths
-	pub fn payer_id(&self) -> PublicKey {
-		self.payer_id
+	pub fn payer_signing_pubkey(&self) -> PublicKey {
+		self.payer_signing_pubkey
 	}
 
 	/// Payer provided note to include in the invoice.
@@ -765,7 +765,7 @@ impl RefundContents {
 			amount: Some(self.amount_msats),
 			features,
 			quantity: self.quantity,
-			payer_id: Some(&self.payer_id),
+			payer_id: Some(&self.payer_signing_pubkey),
 			payer_note: self.payer_note.as_ref(),
 			paths: self.paths.as_ref(),
 		};
@@ -901,14 +901,14 @@ impl TryFrom<RefundTlvStream> for RefundContents {
 
 		let features = features.unwrap_or_else(InvoiceRequestFeatures::empty);
 
-		let payer_id = match payer_id {
+		let payer_signing_pubkey = match payer_id {
 			None => return Err(Bolt12SemanticError::MissingPayerSigningPubkey),
 			Some(payer_id) => payer_id,
 		};
 
 		Ok(RefundContents {
 			payer, description, absolute_expiry, issuer, chain, amount_msats, features, quantity,
-			payer_id, payer_note, paths,
+			payer_signing_pubkey, payer_note, paths,
 		})
 	}
 }
@@ -985,7 +985,7 @@ mod tests {
 		assert_eq!(refund.chain(), ChainHash::using_genesis_block(Network::Bitcoin));
 		assert_eq!(refund.amount_msats(), 1000);
 		assert_eq!(refund.features(), &InvoiceRequestFeatures::empty());
-		assert_eq!(refund.payer_id(), payer_pubkey());
+		assert_eq!(refund.payer_signing_pubkey(), payer_pubkey());
 		assert_eq!(refund.payer_note(), None);
 
 		assert_eq!(
@@ -1040,10 +1040,10 @@ mod tests {
 		let payment_id = PaymentId([1; 32]);
 
 		let refund = RefundBuilder
-			::deriving_payer_id(node_id, &expanded_key, nonce, &secp_ctx, 1000, payment_id)
+			::deriving_signing_pubkey(node_id, &expanded_key, nonce, &secp_ctx, 1000, payment_id)
 			.unwrap()
 			.build().unwrap();
-		assert_eq!(refund.payer_id(), node_id);
+		assert_eq!(refund.payer_signing_pubkey(), node_id);
 
 		// Fails verification with altered fields
 		let invoice = refund
@@ -1089,7 +1089,7 @@ mod tests {
 	}
 
 	#[test]
-	fn builds_refund_with_derived_payer_id() {
+	fn builds_refund_with_derived_signing_pubkey() {
 		let node_id = payer_pubkey();
 		let expanded_key = ExpandedKey::new(&KeyMaterial([42; 32]));
 		let entropy = FixedEntropy {};
@@ -1106,11 +1106,11 @@ mod tests {
 		);
 
 		let refund = RefundBuilder
-			::deriving_payer_id(node_id, &expanded_key, nonce, &secp_ctx, 1000, payment_id)
+			::deriving_signing_pubkey(node_id, &expanded_key, nonce, &secp_ctx, 1000, payment_id)
 			.unwrap()
 			.path(blinded_path)
 			.build().unwrap();
-		assert_ne!(refund.payer_id(), node_id);
+		assert_ne!(refund.payer_signing_pubkey(), node_id);
 
 		let invoice = refund
 			.respond_with_no_std(payment_paths(), payment_hash(), recipient_pubkey(), now())
@@ -1211,7 +1211,7 @@ mod tests {
 			.build()
 			.unwrap();
 		let (_, _, invoice_request_tlv_stream) = refund.as_tlv_stream();
-		assert_eq!(refund.payer_id(), pubkey(42));
+		assert_eq!(refund.payer_signing_pubkey(), pubkey(42));
 		assert_eq!(refund.paths(), paths.as_slice());
 		assert_ne!(pubkey(42), pubkey(44));
 		assert_eq!(invoice_request_tlv_stream.payer_id, Some(&pubkey(42)));