From ef3679051214a9b3047b68f236eac656edcf8d38 Mon Sep 17 00:00:00 2001
From: Adam Soltys <asoltys@gmail.com>
Date: Wed, 18 Jan 2023 23:14:48 -0800
Subject: bitcoin invoices

---
 index.js           |  1 +
 lib/bitcoin.js     |  2 +-
 lib/rpc.js         | 26 ++++++++++++++++++++++++++
 lib/utils.js       |  9 +++++++++
 routes/invoices.js | 38 ++++++++++++++++++++++++--------------
 routes/payments.js |  7 ++++++-
 6 files changed, 67 insertions(+), 16 deletions(-)
 create mode 100644 lib/rpc.js

diff --git a/index.js b/index.js
index 1ade59d8..6a34f543 100644
--- a/index.js
+++ b/index.js
@@ -50,6 +50,7 @@ app.get("/payments/:hash", auth, payments.get);
 app.post("/lightning/send", auth, payments.sendLightning);
 app.get("/pot/:name", payments.pot);
 app.post("/withdraw", auth, payments.withdraw);
+app.post("/bitcoin", payments.bitcoin);
 
 app.get("/voucher/:id", payments.voucher);
 app.post("/redeem", optional, payments.redeem);
diff --git a/lib/bitcoin.js b/lib/bitcoin.js
index eda8b4b0..a811dc14 100644
--- a/lib/bitcoin.js
+++ b/lib/bitcoin.js
@@ -1,3 +1,3 @@
 import config from "$config";
-import rpc from "./rpc";
+import rpc from "$lib/rpc";
 export default rpc(config.bitcoin);
diff --git a/lib/rpc.js b/lib/rpc.js
new file mode 100644
index 00000000..b8a2d0dd
--- /dev/null
+++ b/lib/rpc.js
@@ -0,0 +1,26 @@
+import got from "got";
+
+export default ({ host, port, wallet, username, password }) =>
+  new Proxy(
+    {},
+    {
+      get: (target, prop) => (...params) =>
+        ((method, ...params) => {
+          let url = `http://${host}:${port}/wallet/${wallet}`;
+          return got
+            .post(url, {
+              json: {
+                method,
+                params
+              },
+              headers: {
+                authorization: `Basic ${Buffer.from(
+                  `${username}:${password}`
+                ).toString("base64")}`
+              }
+            })
+            .json()
+            .then(({ result }) => result);
+        })(prop.toLowerCase(), ...params)
+    }
+  );
diff --git a/lib/utils.js b/lib/utils.js
index 92b34be5..e653f235 100644
--- a/lib/utils.js
+++ b/lib/utils.js
@@ -28,3 +28,12 @@ export const toSats = n => Math.round(n * SATS);
 export const uniq = (a, k) => [...new Map(a.map(x => [k(x), x])).values()];
 export const pick = (O, K) =>
   K.reduce((o, k) => (typeof O[k] !== "undefined" && (o[k] = O[k]), o), {});
+
+export const bip21 = (address, { amount, memo, tip }) => {
+  let url = amount || memo ? `bitcoin:${address}?` : address;
+  if (amount)
+    url += `amount=${((amount + tip) / SATS).toFixed(8)}${memo ? "&" : ""}`;
+  if (memo) url += `message=${memo}`;
+
+  return url;
+};
diff --git a/routes/invoices.js b/routes/invoices.js
index acd9457e..1287de88 100644
--- a/routes/invoices.js
+++ b/routes/invoices.js
@@ -2,6 +2,8 @@ import store from "$lib/store";
 import { l } from "$lib/logging";
 import { emit } from "$lib/sockets";
 import { db, g, s } from "$lib/db";
+import { bip21, fail } from "$lib/utils";
+import bc from "$lib/bitcoin";
 import ln from "$lib/ln";
 
 export default {
@@ -12,49 +14,57 @@ export default {
   },
 
   async create({ body: { invoice, user }, user: me }, res) {
-    let { currency, tip, amount, rate, request_id } = invoice;
+    let { currency, tip, amount, rate, request_id, type } = invoice;
 
-    if (amount < 0) throw new Error("amount out of range");
-    if (tip > 5 * amount || tip < 0) throw new Error("tip amount out of range");
+    if (amount < 0) fail("amount out of range");
+    if (tip > 5 * amount || tip < 0) fail("tip amount out of range");
     tip = tip || 0;
 
     if (!user) user = me;
     let uid = await g(`user:${user.username}`);
     user = await g(`user:${uid}`);
 
-    if (!user) throw new Error("user not provided");
+    if (!user) fail("user not provided");
 
     if (!currency) currency = user.currency;
     if (!rate) rate = store.rates[currency];
-    if (amount < 0) throw new Error("invalid amount");
+    if (amount < 0) fail("invalid amount");
 
-    let { payment_hash: hash, bolt11: text } = await ln.invoice(
-      amount ? `${amount + tip}sat` : "any",
-      new Date(),
-      "",
-      3600
-    );
+    let hash, text;
+    if (type === "lightning") {
+      let amt = amount ? `${amount + tip}sat` : "any";
+      let r = await ln.invoice(amt, new Date(), "", 3600);
+
+      hash = r.payment_hash;
+      text = r.bolt11;
+    } else if (type === "bitcoin") {
+      hash = await bc.getNewAddress();
+      text = bip21(hash, invoice);
+    } else {
+      fail("unrecognized type");
+    }
 
     invoice = {
       ...invoice,
-      hash,
       amount,
+      hash,
+      text,
       currency,
       rate,
       tip,
       uid,
-      text,
       received: 0,
       created: Date.now()
     };
 
+
     l(
       "creating invoice",
       user.username,
       amount,
       tip,
       currency,
-      `${text.substr(0, 8)}..${text.substr(-6)}`
+      invoice.hash
     );
 
     await s(`invoice:${hash}`, invoice);
diff --git a/routes/payments.js b/routes/payments.js
index ba701bef..fc506685 100644
--- a/routes/payments.js
+++ b/routes/payments.js
@@ -265,7 +265,7 @@ export default {
   },
 
   async withdraw({ body: { name, amount }, user }, res) {
-    amount = parseInt(amount)
+    amount = parseInt(amount);
     await t(`pot:${name}`, async balance => {
       await new Promise(r => setTimeout(r, 100));
       if (balance < amount) fail("Insufficient funds");
@@ -282,5 +282,10 @@ export default {
     await db.lPush(`pot:${name}:payments`, hash);
 
     res.send({ payment });
+  },
+
+  async bitcoin({ body }, res) {
+    console.log(body);
+    res.send({});
   }
 };
-- 
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