From 5a8c49ad031dcb175ff4a0dec71c818eeab0b491 Mon Sep 17 00:00:00 2001
From: Adam Soltys <adam@coinos.io>
Date: Mon, 2 Dec 2024 22:50:11 -0800
Subject: detect duplicate keysend

---
 lib/nwc.ts      | 5 +++--
 lib/payments.ts | 8 ++++++--
 2 files changed, 9 insertions(+), 4 deletions(-)

diff --git a/lib/nwc.ts b/lib/nwc.ts
index ef5e156e..6313e05d 100644
--- a/lib/nwc.ts
+++ b/lib/nwc.ts
@@ -56,7 +56,7 @@ export default () => {
       const user = await g(`user:${uid}`);
 
       try {
-        const result = await handle(method, params, user);
+        const result = await handle(method, params, user, ev);
         const payload = JSON.stringify({ result_type: method, ...result });
         content = await nip04.encrypt(sk, pubkey, payload);
 
@@ -88,7 +88,7 @@ export default () => {
   });
 };
 
-const handle = (method, params, user) =>
+const handle = (method, params, user, ev) =>
   ({
     async pay_invoice() {
       const { invoice: pr } = params;
@@ -145,6 +145,7 @@ const handle = (method, params, user) =>
       const { amount, pubkey } = params;
 
       const { payment_hash } = await sendKeysend({
+        hash: ev.id,
         amount,
         pubkey,
         user,
diff --git a/lib/payments.ts b/lib/payments.ts
index 7f0ab968..76a7d1fa 100644
--- a/lib/payments.ts
+++ b/lib/payments.ts
@@ -416,6 +416,7 @@ export const sendOnchain = async (params) => {
 };
 
 export const sendKeysend = async ({
+  hash,
   amount,
   pubkey,
   fee = undefined,
@@ -424,8 +425,11 @@ export const sendKeysend = async ({
 }) => {
   fee = Math.max(parseInt(fee || amount * 0.005), 5);
 
-  const p = await debit({
-    hash: v4(),
+  let p = await g(`payment:${hash}`);
+  if (p) fail("duplicate keysend");
+
+  p = await debit({
+    hash,
     amount,
     fee,
     memo,
-- 
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