From e471c897c4b57dd3d4d72ece7d8809a2d3d74b9c Mon Sep 17 00:00:00 2001
From: Roland Bewick <roland.bewick@gmail.com>
Date: Sun, 8 Dec 2024 13:16:28 +0700
Subject: [PATCH 1/2] fix: decode 0-amount invoices

---
 src/invoice.test.ts  | 8 ++++++++
 src/utils/invoice.ts | 9 +++++----
 2 files changed, 13 insertions(+), 4 deletions(-)

diff --git a/src/invoice.test.ts b/src/invoice.test.ts
index 9496dfa..931b016 100644
--- a/src/invoice.test.ts
+++ b/src/invoice.test.ts
@@ -13,6 +13,9 @@ const paymentRequestWithMemo =
 const signetPaymentRequest =
   "lntbs758310n1pnryklfpp59hmrqxpmanfm4sh4afnqs80yas294hvscr2lv0scp4hza7gpyf5sdyzgd5xzmnwv4kzqvpwxqcnqvpsxqcrqgr5dusryvpjxsknqdedxvc9gv338g6nyw35xyhrzd3ntgszscfnxdjrgvryvsukzd3n893njvf5x5mnvctzx9nrsv3hv9jrgvty9ycqzzsxqrrsssp5pq5nl5xw9hf4k7xl8d635kd60kgdm0jnwe3tvu7dp8zrfedcyzes9qyyssq8qcl3h6ptahwtc8k7q9qrz8v3r0fhp779wuhykxkmn0x6qegl4x4jga2ykcwf5vu89slhzka0w4n7a9n26qcxgzhg4mdymky8smdvvqpw9t93a";
 
+const zeroAmountPaymentRequest =
+  "lnbc1pn42dukpp5wzqdjf8cv7pxa3rpa5vur8804ud0ckt24jctkq6qlr7w25kuc2fsdp82pshjgr5dusyymrfde4jq4mpd3kx2apq24ek2uscqzpuxqr8pqsp5nkrvgqj37ztv2luy6sfg0fgsr4p4rrqw3s3z5g63f8fsxh86u0hq9p4gqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqpqysgqu68rgn4k22zlgzuylamdv6zaczf4rwwrrzlhvw672m8cphctk8shsamruj5ymh04jssy6x09fx99ahrsm7z4w840psu2u3nhtfjw50qpf8qku8";
+
 describe("Invoice", () => {
   test("decode invoice without description", () => {
     const decodedInvoice = new Invoice({ pr: paymentRequestWithoutMemo });
@@ -43,6 +46,11 @@ describe("Invoice", () => {
     expect(decodedInvoice.description).toBe("Test memo");
   });
 
+  test("decode invoice with zero amount", () => {
+    const decodedInvoice = new Invoice({ pr: zeroAmountPaymentRequest });
+    expect(decodedInvoice.satoshi).toBe(0);
+  });
+
   test("decode signet invoice", () => {
     const decodedInvoice = new Invoice({ pr: signetPaymentRequest });
     expect(decodedInvoice.satoshi).toBe(75831);
diff --git a/src/utils/invoice.ts b/src/utils/invoice.ts
index a5ca6b8..58e39c0 100644
--- a/src/utils/invoice.ts
+++ b/src/utils/invoice.ts
@@ -25,12 +25,13 @@ export const decodeInvoice = (
 
     const paymentHash = hashTag.value;
 
-    const amountTag = decoded.sections.find((value) => value.name === "amount");
+    let satoshi = 0;
 
-    if (amountTag?.name !== "amount" || amountTag.value === undefined)
-      return null;
+    const amountTag = decoded.sections.find((value) => value.name === "amount");
 
-    const satoshi = parseInt(amountTag.value) / 1000; // millisats
+    if (amountTag?.name === "amount" && amountTag.value) {
+      satoshi = parseInt(amountTag.value) / 1000; // millisats
+    }
 
     const timestampTag = decoded.sections.find(
       (value) => value.name === "timestamp",

From 7b5b9fef2d10265a2d4d31760f72ace0a441417f Mon Sep 17 00:00:00 2001
From: Roland Bewick <roland.bewick@gmail.com>
Date: Tue, 10 Dec 2024 14:59:26 +0700
Subject: [PATCH 2/2] chore: bump version

---
 package.json | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/package.json b/package.json
index f89dcfe..c993efa 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@getalby/lightning-tools",
-  "version": "5.1.1",
+  "version": "5.1.2",
   "description": "Collection of helpful building blocks and tools to develop Bitcoin Lightning web apps",
   "type": "module",
   "source": "src/index.ts",