Pay to lnurls

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"

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 = {

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,
         }
     }
 }