From 59fe8d2e24085239b15ca282c182d5c7cd1ce4de Mon Sep 17 00:00:00 2001
From: Adam Soltys <adam@coinos.io>
Date: Sat, 19 Jul 2025 22:55:10 -0700
Subject: respect null tips

---
 index.ts        |  1 +
 lib/invoices.ts |  2 +-
 routes/lnurl.ts | 17 +++++++++++++++--
 3 files changed, 17 insertions(+), 3 deletions(-)

diff --git a/index.ts b/index.ts
index b8aaf5dd..c09e26b9 100644
--- a/index.ts
+++ b/index.ts
@@ -94,6 +94,7 @@ app.get("/lnurl/verify/:id", lnurl.verify);
 app.get("/lnurlp/:username", lnurl.lnurlp);
 app.get("/lnurl/:id", lnurl.lnurl);
 app.get("/pay/:username", lnurl.pay);
+app.get("/pay/:username/:amount", lnurl.pay);
 // app.get("/lnurlw", lnurl.withdraw);
 
 app.post("/freeze", payments.freeze);
diff --git a/lib/invoices.ts b/lib/invoices.ts
index d624ac6b..1e08140a 100644
--- a/lib/invoices.ts
+++ b/lib/invoices.ts
@@ -35,7 +35,7 @@ export const generate = async ({ invoice, user }) => {
   } = invoice;
 
   amount = parseInt(amount || 0);
-  tip = parseInt(tip) || null;
+  tip = tip == null ? null : parseInt(tip);
 
   if (user) user = await getUser(user.username);
   if (!user) fail("user not provided");
diff --git a/routes/lnurl.ts b/routes/lnurl.ts
index 4be33ef1..dc51e8fc 100644
--- a/routes/lnurl.ts
+++ b/routes/lnurl.ts
@@ -160,12 +160,13 @@ export default {
   },
 
   async pay(req, res) {
-    const { username } = req.params;
+    const { amount, username } = req.params;
     try {
       const user = await getUser(username);
 
       const invoices = await db.lRange(`${user.id}:invoices`, 0, 10);
       let invoice;
+
       for (const iid of invoices) {
         const i = await getInvoice(iid);
         const paid = i.amount > 0 && i.received >= i.amount;
@@ -177,9 +178,21 @@ export default {
         }
       }
 
-      if (!invoice) {
+      if (invoice) {
+        if (amount?.startsWith("+")) {
+          const tip = invoice.amount * amount.split("+")[1];
+          invoice = await generate({
+            invoice: {
+              ...invoice,
+              tip,
+            },
+            user,
+          });
+        }
+      } else {
         invoice = await generate({
           invoice: {
+            amount,
             prompt: user.prompt,
             type: PaymentType.lightning,
           },
-- 
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