From 414f8faba5374bcbc06f695db77b304f771cab7a Mon Sep 17 00:00:00 2001
From: Adam Soltys <adam@coinos.io>
Date: Tue, 6 May 2025 13:16:47 -0700
Subject: lnurl pay endpoint for latest invoice

---
 index.ts        |  1 +
 routes/lnurl.ts | 42 +++++++++++++++++++++++++++++++++++++++++-
 2 files changed, 42 insertions(+), 1 deletion(-)

diff --git a/index.ts b/index.ts
index 27decf34..10c2b314 100644
--- a/index.ts
+++ b/index.ts
@@ -87,6 +87,7 @@ app.get("/decode", lnurl.decode);
 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("/lnurlw", lnurl.withdraw);
 
 app.post("/freeze", payments.freeze);
diff --git a/routes/lnurl.ts b/routes/lnurl.ts
index 9f247267..e5b3e60c 100644
--- a/routes/lnurl.ts
+++ b/routes/lnurl.ts
@@ -20,7 +20,9 @@ export default {
       query: { address },
     } = req;
     const [name, domain] = address.split("@");
-    const url = `https://${domain}/.well-known/lnurlp/${name.toLowerCase().replace(/\s/g,"")}`;
+    const url = `https://${domain}/.well-known/lnurlp/${name
+      .toLowerCase()
+      .replace(/\s/g, "")}`;
 
     try {
       const r = await got(url).json();
@@ -149,6 +151,44 @@ export default {
     res.send({ pr: hash, status: "OK", settled, preimage: preimage || null });
   },
 
+  async pay(req, res) {
+    const { username } = req.params;
+    try {
+      const user = await getUser(username);
+      const iid = await db.lIndex(`${user.id}:invoices`, 0);
+      const invoice = await getInvoice(iid);
+      const fiveMinutes = 1000 * 60 * 5;
+      const paid = invoice.received >= invoice.amount;
+      const expired = Date.now() - invoice.created > fiveMinutes;
+      if (paid || expired) fail("No active invoice");
+
+      const { id: uid } = user;
+
+      const metadata = JSON.stringify([
+        ["text/plain", `Paying ${username}@${host}`],
+        ["text/identifier", `${username}@${host}`],
+      ]);
+
+      const id = v4();
+      await s(`lnurl:${id}`, uid);
+
+      res.send({
+        allowsNostr: true,
+        minSendable: invoice.amount * 1000,
+        maxSendable: invoice.amount * 1000,
+        metadata,
+        nostrPubkey: serverPubkey,
+        commentAllowed: 512,
+        callback: `${URL}/api/lnurl/${id}`,
+        tag: "payRequest",
+      });
+    } catch (e) {
+      if (!e.message.includes("found"))
+        warn("problem generating lnurlp request", username, e.message);
+      bail(res, e.message);
+    }
+  },
+
   // async withdraw(req, res) {
   //   try {
   //     const { pr, k1: id } = req.query;
-- 
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