lnurl

1 files changed, 73 insertions, 0 deletions

diff --git a/lib/invoices.js b/lib/invoices.js
new file mode 100644
index 00000000..7a45b1c0
--- /dev/null
+++ b/lib/invoices.js
@@ -0,0 +1,73 @@
+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 "$lib/utils";
+import { types } from "$lib/payments";
+import { v4 } from "uuid";
+
+import bc from "$lib/bitcoin";
+import ln from "$lib/ln";
+
+export let invoice = async ({ invoice, user, sender }) => {
+  let { currency, tip, amount, rate, request_id, type } = invoice;
+
+  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 = sender;
+  let uid = await g(`user:${user.username}`);
+  user = await g(`user:${uid}`);
+
+  if (!user) fail("user not provided");
+
+  if (!currency) currency = user.currency;
+  if (!rate) rate = store.rates[currency];
+  if (amount < 0) fail("invalid amount");
+
+  let hash, text;
+  if (type === types.lightning) {
+    let amt = amount ? `${amount + tip}sat` : "any";
+    let r = await ln.invoice(amt, new Date(), "", 3600);
+
+    hash = r.payment_hash;
+    text = r.bolt11;
+  } else if (type === types.bitcoin) {
+    hash = await bc.getNewAddress();
+    text = bip21(hash, invoice);
+  } else if (type === types.internal) {
+    hash = v4();
+  } else {
+    fail("unrecognized type");
+  }
+
+  invoice = {
+    ...invoice,
+    amount,
+    hash,
+    text,
+    currency,
+    rate,
+    tip,
+    uid,
+    received: 0,
+    created: Date.now()
+  };
+
+  l("creating invoice", user.username, amount, tip, currency, invoice.hash);
+
+  await s(`invoice:${hash}`, invoice);
+  await db.lPush(`${uid}:invoices`, hash);
+
+  if (request_id) {
+    let request = await g(`request:${request_id}`);
+    let { invoice_id: prev } = request;
+    request.invoice_id = invoice.id;
+    await s(`request:${request_id}`, request);
+
+    if (!prev) emit(request.requester.username, "invoice", invoice);
+  }
+
+  return invoice;
+};