Fail Unified QR URI parsing if any known param fails

Previously, we decided to continue parsing any fields if we failed to
parse a known (i.e., `lightning` or `lno`) parameter failed to parse.
This however just hides the error and is a bit anti-idiomatic even
though allowing to use *some* URI fields even in the face of
incompatible formats for others.

Here we therefore opt to fail parsing the URI if any field fails.

src/payment/unified_qr.rs

@@ -256,22 +256,19 @@ impl<'a> bip21::de::DeserializationState<'a> for DeserializationState {
 			"lightning" => {
 				let bolt11_value =
 					String::try_from(value).map_err(|_| Error::UriParameterParsingFailed)?;
-				if let Ok(invoice) = bolt11_value.parse::<Bolt11Invoice>() {
-					self.bolt11_invoice = Some(invoice);
-					Ok(bip21::de::ParamKind::Known)
-				} else {
-					Ok(bip21::de::ParamKind::Unknown)
-				}
+				let invoice = bolt11_value
+					.parse::<Bolt11Invoice>()
+					.map_err(|_| Error::UriParameterParsingFailed)?;
+				self.bolt11_invoice = Some(invoice);
+				Ok(bip21::de::ParamKind::Known)
 			},
 			"lno" => {
 				let bolt12_value =
 					String::try_from(value).map_err(|_| Error::UriParameterParsingFailed)?;
-				if let Ok(offer) = bolt12_value.parse::<Offer>() {
-					self.bolt12_offer = Some(offer);
-					Ok(bip21::de::ParamKind::Known)
-				} else {
-					Ok(bip21::de::ParamKind::Unknown)
-				}
+				let offer =
+					bolt12_value.parse::<Offer>().map_err(|_| Error::UriParameterParsingFailed)?;
+				self.bolt12_offer = Some(offer);
+				Ok(bip21::de::ParamKind::Known)
 			},
 			_ => Ok(bip21::de::ParamKind::Unknown),
 		}

tests/integration_tests_rust.rs

@@ -868,11 +868,10 @@ fn unified_qr_send_receive() {
 
 	expect_payment_successful_event!(node_a, Some(offer_payment_id), None);
 
-	// Removed one character from the offer to fall back on to invoice.
-	// Still needs work
-	let uri_str_with_invalid_offer = &uri_str[..uri_str.len() - 1];
+	// Cut off the BOLT12 part to fallback to BOLT11.
+	let uri_str_without_offer = uri_str.split("&lno=").next().unwrap();
 	let invoice_payment_id: PaymentId =
-		match node_a.unified_qr_payment().send(uri_str_with_invalid_offer) {
+		match node_a.unified_qr_payment().send(uri_str_without_offer) {
 			Ok(QrPaymentResult::Bolt12 { payment_id: _ }) => {
 				panic!("Expected Bolt11 payment but got Bolt12");
 			},
@@ -893,11 +892,9 @@ fn unified_qr_send_receive() {
 	let onchain_uqr_payment =
 		node_b.unified_qr_payment().receive(expect_onchain_amount_sats, "asdf", 4_000).unwrap();
 
-	// Removed a character from the offer, so it would move on to the other parameters.
-	let txid = match node_a
-		.unified_qr_payment()
-		.send(&onchain_uqr_payment.as_str()[..onchain_uqr_payment.len() - 1])
-	{
+	// Cut off any lightning part to fallback to on-chain only.
+	let uri_str_without_lightning = onchain_uqr_payment.split("&lightning=").next().unwrap();
+	let txid = match node_a.unified_qr_payment().send(&uri_str_without_lightning) {
 		Ok(QrPaymentResult::Bolt12 { payment_id: _ }) => {
 			panic!("Expected on-chain payment but got Bolt12")
 		},