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import config from "$config";
import { err } from "$lib/logging";
import { g } from "$lib/db";
import { Relay } from "nostr";
import { getInvoice, sleep } from "$lib/utils";
import { sendInternal, sendLightning } from "$lib/payments";
import { handleZap, serverPubkey } from "$lib/nostr";
import { nip04, nip19, finalizeEvent } from "nostr-tools";
import type { UnsignedEvent } from "nostr-tools";
import { generate } from "$lib/invoices";
import ln from "$lib/ln";
const result = (result) => ({ result });
const error = (error) => ({ error });
const methods = ["pay_invoice", "get_balance", "get_info", "make_invoice"];
export default () => {
const r = new Relay("ws://strfry:7777");
r.on("open", (_) => {
r.subscribe("nwc", { kinds: [23194], "#p": [serverPubkey] });
});
r.on("event", async (sub, ev) => {
try {
if (sub !== "nwc") return;
let { content, pubkey } = ev;
const sk = nip19.decode(config.nostrKey).data as Uint8Array;
const { params, method } = JSON.parse(
await nip04.decrypt(sk, pubkey, content),
);
if (!methods.includes(method)) return;
const uid = await g(pubkey);
const user = await g(`user:${uid}`);
const result = await handle(method, params, user);
const payload = JSON.stringify({ result_type: method, ...result });
content = await nip04.encrypt(sk, pubkey, payload);
let response: UnsignedEvent = {
created_at: Math.floor(Date.now() / 1000),
kind: 23195,
pubkey: serverPubkey,
tags: [
["p", pubkey],
["e", ev.id],
],
content,
};
response = await finalizeEvent(response, sk);
r.send(["EVENT", response]);
} catch (e) {
err("problem with nwc", e.message);
}
});
};
const handle = (method, params, user) =>
({
async pay_invoice() {
const { invoice: pr } = params;
const { amount_msat, payee } = await ln.decode(pr);
const { id } = await ln.getinfo();
const amount = Math.round(amount_msat / 1000);
if (payee === id) {
const invoice = await getInvoice(pr);
const recipient = await g(`user:${invoice.uid}`);
const { id: preimage } = await sendInternal({
amount,
invoice,
recipient,
sender: user,
});
if (invoice.memo.includes("9734")) {
const { invoices } = await ln.listinvoices({ invstring: pr });
const inv = invoices[0];
inv.payment_preimage = preimage;
inv.paid_at = Math.floor(Date.now() / 1000);
try {
await handleZap(inv);
} catch (e) {
console.log("zap receipt failed", e);
}
}
return result({ preimage });
}
await sendLightning({
amount,
user,
pr,
maxfee: 50,
});
for (let i = 0; i < 10; i++) {
const { pays } = await ln.listpays(pr);
const p = pays.find((p) => p.status === "complete");
if (p) {
const { preimage } = p;
return result({ preimage });
}
await sleep(2000);
}
return error({ code: "INTERNAL", message: "Payment timed out" });
},
async get_info() {
const { alias, blockheight, color } = await ln.getinfo();
return result({
alias,
color,
pubkey: serverPubkey,
network: "mainnet",
block_height: blockheight,
methods,
});
},
async get_balance() {
let balance = await g(`balance:${user.id}`);
balance *= 1000;
return result({ balance });
},
async make_invoice() {
const { amount, description, description_hash, expiry } = params;
const invoice = {
amount: Math.round(amount / 1000),
type: "lightning",
memo: description,
expiry,
};
const { hash, created: created_at } = await generate({ invoice, user });
return result({
type: "incoming",
invoice: hash,
description,
description_hash,
amount,
created_at,
expires_at: created_at + expiry,
metadata: {},
});
},
})[method](params);
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