Add BOLT12 support to bLIP-51 / LSPS1

Previously, bLIP-51 / LSPS1 only supported BOLT11 and onchain payment
options. Here we add the necessary fields to allow to pay the LSP via
BOLT12 offers.

Author: tnull

lightning-liquidity/src/lsps0/ser.rs

@@ -677,6 +677,32 @@ pub(crate) mod string_amount_option {
 	}
 }
 
+pub(crate) mod string_offer {
+	use crate::prelude::{String, ToString};
+	use core::str::FromStr;
+	use lightning::offers::offer::Offer;
+	use serde::de::Unexpected;
+	use serde::{Deserialize, Deserializer, Serializer};
+
+	pub(crate) fn serialize<S>(x: &Offer, s: S) -> Result<S::Ok, S::Error>
+	where
+		S: Serializer,
+	{
+		s.serialize_str(&x.to_string())
+	}
+
+	pub(crate) fn deserialize<'de, D>(deserializer: D) -> Result<Offer, D::Error>
+	where
+		D: Deserializer<'de>,
+	{
+		let buf = String::deserialize(deserializer)?;
+
+		Offer::from_str(&buf).map_err(|_| {
+			serde::de::Error::invalid_value(Unexpected::Str(&buf), &"invalid offer string")
+		})
+	}
+}
+
 pub(crate) mod unchecked_address {
 	use crate::prelude::{String, ToString};
 	use bitcoin::Address;

lightning-liquidity/src/lsps1/msgs.rs

@@ -1,14 +1,15 @@
 //! Message, request, and other primitive types used to implement bLIP-51 / LSPS1.
 
 use crate::lsps0::ser::{
-	string_amount, u32_fee_rate, unchecked_address, unchecked_address_option, LSPSDateTime,
-	LSPSMessage, LSPSRequestId, LSPSResponseError,
+	string_amount, string_offer, u32_fee_rate, unchecked_address, unchecked_address_option,
+	LSPSDateTime, LSPSMessage, LSPSRequestId, LSPSResponseError,
 };
 
 use crate::prelude::String;
 
 use bitcoin::{Address, FeeRate, OutPoint};
 
+use lightning::offers::offer::Offer;
 use lightning_invoice::Bolt11Invoice;
 
 use serde::{Deserialize, Serialize};
@@ -172,6 +173,24 @@ pub struct LSPS1Bolt11PaymentInfo {
 	pub invoice: Bolt11Invoice,
 }
 
+/// A Lightning payment using BOLT 12.
+#[derive(Clone, Debug, PartialEq, Eq, Deserialize, Serialize)]
+pub struct LSPS1Bolt12PaymentInfo {
+	/// Indicates the current state of the payment.
+	pub state: LSPS1PaymentState,
+	/// The datetime when the payment option expires.
+	pub expires_at: LSPSDateTime,
+	/// The total fee the LSP will charge to open this channel in satoshi.
+	#[serde(with = "string_amount")]
+	pub fee_total_sat: u64,
+	/// The amount the client needs to pay to have the requested channel openend.
+	#[serde(with = "string_amount")]
+	pub order_total_sat: u64,
+	/// A BOLT12 offer the client can pay to have to channel opened.
+	#[serde(with = "string_offer")]
+	pub offer: Offer,
+}
+
 /// An onchain payment.
 #[derive(Clone, Debug, PartialEq, Eq, Deserialize, Serialize)]
 pub struct LSPS1OnchainPaymentInfo {
@@ -387,6 +406,15 @@ mod tests {
 		}"#;
 		let _bolt11_payment: LSPS1Bolt11PaymentInfo = serde_json::from_str(json_str).unwrap();
 
+		let json_str = r#"{
+			"state" : "EXPECT_PAYMENT",
+			"expires_at": "2025-01-01T00:00:00Z",
+			"fee_total_sat": "8888",
+			"order_total_sat": "200888",
+			"offer": "lno1qgsqvgnwgcg35z6ee2h3yczraddm72xrfua9uve2rlrm9deu7xyfzrcgqvp3pwq2q3shxerxzzfqyxdxxkjqxfpt9tz94zj79m4n99kwjddq92uqryuwsu4nt0t3lthfq02jzqla96dtkf4rew8edxw0p85swe89wd8ldekdl5j262n76qyl2qgzajm08clzr74z6ssy0qlvvp9f5kvrxf27yz4pcy99jge69kxu8ttsqt8gw8jsk5397zvvdf4lfd52paf73thcg6xf57xmvtdrwny5mn2r4jw2d5jzalqrq537mmt6u9qpqytzzql6zemrme07jqqwtza76lldcj9wgc0ccd4d2w584cdcx6szsuupvy"
+		}"#;
+		let _bolt11_payment: LSPS1Bolt12PaymentInfo = serde_json::from_str(json_str).unwrap();
+
 		let json_str = r#"{
 			"state": "EXPECT_PAYMENT",
 			"expires_at": "2025-01-01T00:00:00Z",
@@ -406,6 +434,13 @@ mod tests {
 				"order_total_sat": "200888",
 				"invoice": "lnbc252u1p3aht9ysp580g4633gd2x9lc5al0wd8wx0mpn9748jeyz46kqjrpxn52uhfpjqpp5qgf67tcqmuqehzgjm8mzya90h73deafvr4m5705l5u5l4r05l8cqdpud3h8ymm4w3jhytnpwpczqmt0de6xsmre2pkxzm3qydmkzdjrdev9s7zhgfaqxqyjw5qcqpjrzjqt6xptnd85lpqnu2lefq4cx070v5cdwzh2xlvmdgnu7gqp4zvkus5zapryqqx9qqqyqqqqqqqqqqqcsq9q9qyysgqen77vu8xqjelum24hgjpgfdgfgx4q0nehhalcmuggt32japhjuksq9jv6eksjfnppm4hrzsgyxt8y8xacxut9qv3fpyetz8t7tsymygq8yzn05"
 			},
+			"bolt12": {
+				"state" : "EXPECT_PAYMENT",
+				"expires_at": "2025-01-01T00:00:00Z",
+				"fee_total_sat": "8888",
+				"order_total_sat": "200888",
+				"offer": "lno1qgsqvgnwgcg35z6ee2h3yczraddm72xrfua9uve2rlrm9deu7xyfzrcgqvp3pwq2q3shxerxzzfqyxdxxkjqxfpt9tz94zj79m4n99kwjddq92uqryuwsu4nt0t3lthfq02jzqla96dtkf4rew8edxw0p85swe89wd8ldekdl5j262n76qyl2qgzajm08clzr74z6ssy0qlvvp9f5kvrxf27yz4pcy99jge69kxu8ttsqt8gw8jsk5397zvvdf4lfd52paf73thcg6xf57xmvtdrwny5mn2r4jw2d5jzalqrq537mmt6u9qpqytzzql6zemrme07jqqwtza76lldcj9wgc0ccd4d2w584cdcx6szsuupvy"
+			},
 			"onchain": {
 				"state": "EXPECT_PAYMENT",
 				"expires_at": "2025-01-01T00:00:00Z",
@@ -416,7 +451,10 @@ mod tests {
 				"min_fee_for_0conf": 253
 			}
 		}"#;
-		let _payment: LSPS1PaymentInfo = serde_json::from_str(json_str).unwrap();
+		let payment: LSPS1PaymentInfo = serde_json::from_str(json_str).unwrap();
+		assert!(payment.bolt11.is_some());
+		assert!(payment.bolt12.is_some());
+		assert!(payment.onchain.is_some());
 
 		let json_str = r#"{
 			"order_id": "bb4b5d0a-8334-49d8-9463-90a6d413af7c",
@@ -437,6 +475,13 @@ mod tests {
 					"order_total_sat": "2008888",
 					"invoice" : "lnbc252u1p3aht9ysp580g4633gd2x9lc5al0wd8wx0mpn9748jeyz46kqjrpxn52uhfpjqpp5qgf67tcqmuqehzgjm8mzya90h73deafvr4m5705l5u5l4r05l8cqdpud3h8ymm4w3jhytnpwpczqmt0de6xsmre2pkxzm3qydmkzdjrdev9s7zhgfaqxqyjw5qcqpjrzjqt6xptnd85lpqnu2lefq4cx070v5cdwzh2xlvmdgnu7gqp4zvkus5zapryqqx9qqqyqqqqqqqqqqqcsq9q9qyysgqen77vu8xqjelum24hgjpgfdgfgx4q0nehhalcmuggt32japhjuksq9jv6eksjfnppm4hrzsgyxt8y8xacxut9qv3fpyetz8t7tsymygq8yzn05"
 				},
+				"bolt12": {
+					"state" : "EXPECT_PAYMENT",
+					"expires_at": "2025-01-01T00:00:00Z",
+					"fee_total_sat": "8888",
+					"order_total_sat": "200888",
+					"offer": "lno1qgsqvgnwgcg35z6ee2h3yczraddm72xrfua9uve2rlrm9deu7xyfzrcgqvp3pwq2q3shxerxzzfqyxdxxkjqxfpt9tz94zj79m4n99kwjddq92uqryuwsu4nt0t3lthfq02jzqla96dtkf4rew8edxw0p85swe89wd8ldekdl5j262n76qyl2qgzajm08clzr74z6ssy0qlvvp9f5kvrxf27yz4pcy99jge69kxu8ttsqt8gw8jsk5397zvvdf4lfd52paf73thcg6xf57xmvtdrwny5mn2r4jw2d5jzalqrq537mmt6u9qpqytzzql6zemrme07jqqwtza76lldcj9wgc0ccd4d2w584cdcx6szsuupvy"
+				},
 				"onchain": {
 					"state": "EXPECT_PAYMENT",
 					"expires_at": "2015-01-25T19:29:44.612Z",
@@ -450,8 +495,11 @@ mod tests {
 			},
 			"channel": null
 		}"#;
-		let _create_order_response: LSPS1CreateOrderResponse =
+		let create_order_response: LSPS1CreateOrderResponse =
 			serde_json::from_str(json_str).unwrap();
+		assert!(create_order_response.payment.bolt11.is_some());
+		assert!(create_order_response.payment.bolt12.is_some());
+		assert!(create_order_response.payment.onchain.is_some());
 
 		let json_str = r#"{
 			"order_id": "bb4b5d0a-8334-49d8-9463-90a6d413af7c"