From 2d9b84477743c7d41ab2cb77d95579bc25b2b54c Mon Sep 17 00:00:00 2001
From: benthecarman <benthecarman@live.com>
Date: Tue, 26 Mar 2024 13:17:08 -0500
Subject: [PATCH] Pay to lnurls

---
 Cargo.lock       | 31 ++++---------------------------
 Cargo.toml       |  2 +-
 src/lightning.rs | 18 +++++++++++++++++-
 src/main.rs      |  5 ++++-
 4 files changed, 26 insertions(+), 30 deletions(-)

diff --git a/Cargo.lock b/Cargo.lock
index 57e2f52..8ed9373 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -369,8 +369,8 @@ dependencies = [
  "bip21",
  "bitcoin",
  "itertools 0.12.0",
- "lightning 0.0.119",
- "lightning-invoice 0.27.0",
+ "lightning",
+ "lightning-invoice",
  "lnurl-rs",
  "nostr 0.26.2",
  "url",
@@ -1250,16 +1250,6 @@ dependencies = [
  "hex-conservative",
 ]
 
-[[package]]
-name = "lightning"
-version = "0.0.121"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5b0c1f811ae288f86c6767055c55b5f7a721ca1e61bf1897a9ae2ec663e8aba1"
-dependencies = [
- "bitcoin",
- "hex-conservative",
-]
-
 [[package]]
 name = "lightning-invoice"
 version = "0.27.0"
@@ -1268,20 +1258,7 @@ checksum = "fd3421ccfaeac77763114f68f3fc5308f11a0e8a880618b4f84d1d22493aa465"
 dependencies = [
  "bech32",
  "bitcoin",
- "lightning 0.0.119",
- "num-traits",
- "secp256k1",
-]
-
-[[package]]
-name = "lightning-invoice"
-version = "0.29.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5b186aca4a605d4db3b85979922be287b9ebd5dedd8132963bb9dbeb8f7d2a04"
-dependencies = [
- "bech32",
- "bitcoin",
- "lightning 0.0.121",
+ "lightning",
  "num-traits",
  "secp256k1",
 ]
@@ -1425,7 +1402,7 @@ dependencies = [
  "bitcoincore-rpc",
  "dotenv",
  "hex",
- "lightning-invoice 0.29.0",
+ "lightning-invoice",
  "lnurl-rs",
  "log",
  "nostr 0.29.0",
diff --git a/Cargo.toml b/Cargo.toml
index 3db9bfb..1e0ddf8 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -18,7 +18,7 @@ lnurl-rs = "0.4.0"
 hex = "0.4.3"
 bitcoincore-rpc = "0.17.0"
 bitcoin = "0.30.2"
-lightning-invoice = "0.29.0"
+lightning-invoice = "0.27.0"
 tower-http = { version = "0.4.0", features = ["cors"] }
 log = "0.4.20"
 pretty_env_logger = "0.5.0"
diff --git a/src/lightning.rs b/src/lightning.rs
index 5a826ea..65cfe24 100644
--- a/src/lightning.rs
+++ b/src/lightning.rs
@@ -1,6 +1,8 @@
 use serde::{Deserialize, Serialize};
 
 use bitcoin_waila::PaymentParams;
+use lightning_invoice::Bolt11Invoice;
+use lnurl::LnUrlResponse;
 use std::str::FromStr;
 use tonic_openssl_lnd::lnrpc;
 
@@ -28,8 +30,22 @@ pub async fn pay_lightning(state: AppState, bolt11: &str) -> anyhow::Result<Stri
         } else {
             anyhow::bail!("bolt11 invoice should have an amount");
         }
+    } else if let Some(lnurl) = params.lnurl() {
+        match state.lnurl.make_request(&lnurl.url).await? {
+            LnUrlResponse::LnUrlPayResponse(pay) => {
+                if pay.min_sendable > MAX_SEND_AMOUNT {
+                    anyhow::bail!("max amount is 10,000,000");
+                }
+                let inv = state
+                    .lnurl
+                    .get_invoice(&pay, pay.min_sendable, None, None)
+                    .await?;
+                Bolt11Invoice::from_str(inv.invoice())?
+            }
+            _ => anyhow::bail!("invalid lnurl"),
+        }
     } else {
-        anyhow::bail!("invalid bolt11");
+        anyhow::bail!("invalid bolt11")
     };
 
     let payment_preimage = {
diff --git a/src/main.rs b/src/main.rs
index 62bcea6..8fa6446 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -8,7 +8,7 @@ use axum::{
 };
 use bitcoincore_rpc::Client;
 use lnurl::withdraw::WithdrawalResponse;
-use lnurl::Tag;
+use lnurl::{AsyncClient, Tag};
 use log::error;
 use nostr::key::Keys;
 use serde::Deserialize;
@@ -40,6 +40,7 @@ pub struct AppState {
     network: bitcoin::Network,
     lightning_client: LndLightningClient,
     bitcoin_client: Arc<Client>,
+    lnurl: AsyncClient,
 }
 
 impl AppState {
@@ -50,12 +51,14 @@ impl AppState {
         bitcoin_client: Client,
         network: bitcoin::Network,
     ) -> Self {
+        let lnurl = lnurl::Builder::default().build_async().unwrap();
         AppState {
             host,
             keys,
             network,
             lightning_client,
             bitcoin_client: Arc::new(bitcoin_client),
+            lnurl,
         }
     }
 }