Result from Bolt12Invoice::verify_using_payer_data

Use a Result return type instead of a bool when verifying a
Bolt12Invoice. This way ignoring the result will produce a compiler
warning.

Author: jkczyz

lightning/src/ln/channelmanager.rs

@@ -4223,10 +4223,7 @@ where
 				invoice.verify_using_metadata(expanded_key, secp_ctx)
 			},
 			OffersContext::OutboundPayment { payment_id, nonce } => {
-				invoice
-					.verify_using_payer_data(*payment_id, *nonce, expanded_key, secp_ctx)
-					.then(|| *payment_id)
-					.ok_or(())
+				invoice.verify_using_payer_data(*payment_id, *nonce, expanded_key, secp_ctx)
 			},
 			_ => Err(()),
 		}

lightning/src/offers/invoice.rs

@@ -790,12 +790,13 @@ impl Bolt12Invoice {
 	/// sent through.
 	pub fn verify_using_payer_data<T: secp256k1::Signing>(
 		&self, payment_id: PaymentId, nonce: Nonce, key: &ExpandedKey, secp_ctx: &Secp256k1<T>
-	) -> bool {
+	) -> Result<PaymentId, ()> {
 		let metadata = Metadata::payer_data(payment_id, nonce, key);
-		match self.contents.verify(TlvStream::new(&self.bytes), &metadata, key, secp_ctx) {
-			Ok(extracted_payment_id) => payment_id == extracted_payment_id,
-			Err(()) => false,
-		}
+		self.contents.verify(TlvStream::new(&self.bytes), &metadata, key, secp_ctx)
+			.and_then(|extracted_payment_id| (payment_id == extracted_payment_id)
+				.then(|| payment_id)
+				.ok_or(())
+			)
 	}
 
 	pub(crate) fn as_tlv_stream(&self) -> FullInvoiceTlvStreamRef {

lightning/src/offers/invoice_request.rs

@@ -1417,7 +1417,9 @@ mod tests {
 			Ok(payment_id) => assert_eq!(payment_id, PaymentId([1; 32])),
 			Err(()) => panic!("verification failed"),
 		}
-		assert!(!invoice.verify_using_payer_data(payment_id, nonce, &expanded_key, &secp_ctx));
+		assert!(
+			invoice.verify_using_payer_data(payment_id, nonce, &expanded_key, &secp_ctx).is_err()
+		);
 
 		// Fails verification with altered fields
 		let (
@@ -1488,7 +1490,9 @@ mod tests {
 			.build().unwrap()
 			.sign(recipient_sign).unwrap();
 		assert!(invoice.verify_using_metadata(&expanded_key, &secp_ctx).is_err());
-		assert!(invoice.verify_using_payer_data(payment_id, nonce, &expanded_key, &secp_ctx));
+		assert!(
+			invoice.verify_using_payer_data(payment_id, nonce, &expanded_key, &secp_ctx).is_ok()
+		);
 
 		// Fails verification with altered fields
 		let (
@@ -1511,7 +1515,9 @@ mod tests {
 		signature_tlv_stream.write(&mut encoded_invoice).unwrap();
 
 		let invoice = Bolt12Invoice::try_from(encoded_invoice).unwrap();
-		assert!(!invoice.verify_using_payer_data(payment_id, nonce, &expanded_key, &secp_ctx));
+		assert!(
+			invoice.verify_using_payer_data(payment_id, nonce, &expanded_key, &secp_ctx).is_err()
+		);
 
 		// Fails verification with altered payer id
 		let (
@@ -1534,7 +1540,9 @@ mod tests {
 		signature_tlv_stream.write(&mut encoded_invoice).unwrap();
 
 		let invoice = Bolt12Invoice::try_from(encoded_invoice).unwrap();
-		assert!(!invoice.verify_using_payer_data(payment_id, nonce, &expanded_key, &secp_ctx));
+		assert!(
+			invoice.verify_using_payer_data(payment_id, nonce, &expanded_key, &secp_ctx).is_err()
+		);
 	}
 
 	#[test]

lightning/src/offers/refund.rs

@@ -1049,7 +1049,9 @@ mod tests {
 			Ok(payment_id) => assert_eq!(payment_id, PaymentId([1; 32])),
 			Err(()) => panic!("verification failed"),
 		}
-		assert!(!invoice.verify_using_payer_data(payment_id, nonce, &expanded_key, &secp_ctx));
+		assert!(
+			invoice.verify_using_payer_data(payment_id, nonce, &expanded_key, &secp_ctx).is_err()
+		);
 
 		let mut tlv_stream = refund.as_tlv_stream();
 		tlv_stream.2.amount = Some(2000);
@@ -1111,7 +1113,9 @@ mod tests {
 			.build().unwrap()
 			.sign(recipient_sign).unwrap();
 		assert!(invoice.verify_using_metadata(&expanded_key, &secp_ctx).is_err());
-		assert!(invoice.verify_using_payer_data(payment_id, nonce, &expanded_key, &secp_ctx));
+		assert!(
+			invoice.verify_using_payer_data(payment_id, nonce, &expanded_key, &secp_ctx).is_ok()
+		);
 
 		// Fails verification with altered fields
 		let mut tlv_stream = refund.as_tlv_stream();
@@ -1125,7 +1129,9 @@ mod tests {
 			.unwrap()
 			.build().unwrap()
 			.sign(recipient_sign).unwrap();
-		assert!(!invoice.verify_using_payer_data(payment_id, nonce, &expanded_key, &secp_ctx));
+		assert!(
+			invoice.verify_using_payer_data(payment_id, nonce, &expanded_key, &secp_ctx).is_err()
+		);
 
 		// Fails verification with altered payer_id
 		let mut tlv_stream = refund.as_tlv_stream();
@@ -1140,7 +1146,9 @@ mod tests {
 			.unwrap()
 			.build().unwrap()
 			.sign(recipient_sign).unwrap();
-		assert!(!invoice.verify_using_payer_data(payment_id, nonce, &expanded_key, &secp_ctx));
+		assert!(
+			invoice.verify_using_payer_data(payment_id, nonce, &expanded_key, &secp_ctx).is_err()
+		);
 	}
 
 	#[test]