From 203f51012bfbeb8d9952aad77a11bc37062383c4 Mon Sep 17 00:00:00 2001
From: Roland Bewick <roland.bewick@gmail.com>
Date: Sun, 14 Jan 2024 21:53:30 +0700
Subject: [PATCH] doc: add nip47 pay_invoice example

---
 crates/nostr-sdk/examples/nip47.rs | 79 ++++++++++++++++++++++++++++++
 1 file changed, 79 insertions(+)
 create mode 100644 crates/nostr-sdk/examples/nip47.rs

diff --git a/crates/nostr-sdk/examples/nip47.rs b/crates/nostr-sdk/examples/nip47.rs
new file mode 100644
index 000000000..b23818514
--- /dev/null
+++ b/crates/nostr-sdk/examples/nip47.rs
@@ -0,0 +1,79 @@
+use std::str::FromStr;
+
+use nostr_sdk::prelude::*;
+
+#[tokio::main]
+async fn main() -> Result<()> {
+    let mut nwc_uri_string = String::new();
+    let mut invoice = String::new();
+
+    println!("Please enter a NWC string");
+    std::io::stdin()
+        .read_line(&mut nwc_uri_string)
+        .expect("Failed to read line");
+
+    println!("Please enter a BOLT 11 invoice");
+    std::io::stdin()
+        .read_line(&mut invoice)
+        .expect("Failed to read line");
+
+    invoice = String::from(invoice.trim());
+
+    let nwc_uri =
+        NostrWalletConnectURI::from_str(&nwc_uri_string).expect("Failed to parse NWC URI");
+
+    let my_keys = Keys::new(nwc_uri.secret);
+
+    let client = Client::new(&my_keys);
+    client.add_relay(nwc_uri.relay_url.clone()).await?;
+
+    client.connect().await;
+    println!("Connected to relay {}", nwc_uri.relay_url);
+
+    let req = nip47::Request {
+        method: Method::PayInvoice,
+        params: RequestParams::PayInvoice(PayInvoiceRequestParams { invoice }),
+    };
+
+    let encrypted = nip04::encrypt(&nwc_uri.secret, &nwc_uri.public_key, req.as_json()).unwrap();
+    let p_tag = Tag::PublicKey {
+        public_key: nwc_uri.public_key,
+        relay_url: None,
+        alias: None,
+    };
+
+    let req_event = EventBuilder::new(Kind::WalletConnectRequest, encrypted, [p_tag])
+        .to_event(&Keys::new(nwc_uri.secret))
+        .unwrap();
+
+    let subscription = Filter::new()
+        .author(nwc_uri.public_key)
+        .kind(Kind::WalletConnectResponse)
+        .event(req_event.id)
+        .since(Timestamp::now());
+
+    client.subscribe(vec![subscription]).await;
+
+    client.send_event(req_event).await.unwrap();
+
+    client
+        .handle_notifications(|notification| async {
+            if let RelayPoolNotification::Event { event, .. } = notification {
+                let decrypt_res =
+                    nip04::decrypt(&nwc_uri.secret, &nwc_uri.public_key, event.content).unwrap();
+                println!("{:?}", decrypt_res);
+
+                let nip47_res = nip47::Response::from_json(decrypt_res).unwrap();
+
+                if let Some(ResponseResult::PayInvoice(pay_invoice_result)) = nip47_res.result {
+                    println!("Payment sent. Preimage: {}", pay_invoice_result.preimage);
+                } else {
+                    println!("Unexpected result: {:?}", nip47_res.as_json());
+                }
+            }
+            Ok(true)
+        })
+        .await?;
+
+    Ok(())
+}