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import config from "$config";
import store from "$lib/store";
import jwt from "jsonwebtoken";
import { v4 } from "uuid";
import { err, warn } from "$lib/logging";
import { fail, getUser } from "$lib/utils";
// Verify the token's signature — never trust jwt.decode() here. A decode-only
// gate let anyone forge {id: <victim uid>} (alg:none or any key) and register
// their socket under the victim's uid, receiving every emit for that account.
const verifyToken = (token) => {
try {
return jwt.verify(token, config.jwt);
} catch (e) {
return null;
}
};
const code = 1000;
const all = {};
const subscriptions = [];
const users = {};
export const emit = (uid, type, data) => {
if (type === "payment" && data.amount > 0) {
for (let i = subscriptions.length - 1; i >= 0; i--) {
const s = subscriptions[i];
if (s.invoice && s.invoice.id === data.iid) {
s.ws.send(JSON.stringify({ type, data }));
}
}
}
if (!store.sockets[uid]) return;
for (const id in store.sockets[uid]) {
const ws = store.sockets[uid][id];
// Read-only sockets (POS terminals logged in with a "-ro" token) only
// get payment notifications, mirroring the HTTP read-only whitelist.
if (ws.readonly && type !== "payment") continue;
ws.send(JSON.stringify({ type, data }));
}
};
export const broadcast = (type, data) => {
const sent = [];
for (const uid in store.sockets) {
for (const id in store.sockets[uid]) {
const ws = store.sockets[uid][id];
ws.send(JSON.stringify({ type, data }));
sent.push(ws.id);
}
}
Object.values(all).map((ws: any) => {
if (!sent.includes(ws.id)) ws.send(JSON.stringify({ type, data }));
});
};
const track = async (ws, token) => {
const { id } = ws;
let { id: uid } = verifyToken(token) || {};
if (!uid) fail("Invalid JWT token");
// Read-only tokens (see users.ro) carry "<uid>-ro". The HTTP auth layer
// strips the suffix for whitelisted routes; do the same here so a POS
// device can log in and receive payment events, but nothing else.
const readonly = uid.endsWith("-ro");
if (readonly) uid = uid.slice(0, -3);
const user = await getUser(uid);
if (!user) fail(`User not found ${uid}`);
if (!store.sockets[uid]) store.sockets[uid] = {};
const existing = Object.keys(store.sockets[uid]);
if (existing.length > 4) {
const p = existing.find((sid) => sid !== uid);
store.sockets[uid][p].close(code, "too many sockets");
}
store.sockets[uid][id] = ws;
users[id] = uid;
ws.user = user;
ws.readonly = readonly;
};
Bun.serve({
hostname: "0.0.0.0",
port: 3120,
fetch(req, server) {
// upgrade the request to a WebSocket
if (server.upgrade(req)) {
return; // do not return a Response
}
return new Response("Upgrade failed", { status: 500 });
},
websocket: {
async message(ws: any, message: string) {
let type;
let data;
try {
({ type, data } = JSON.parse(message));
} catch (e) {
err("coudn't parse socket message");
}
switch (type) {
case "heartbeat":
ws.beats = 0;
try {
if (data) await track(ws, data);
ws.send(JSON.stringify({ type: "id", data: ws.id }));
} catch (e) {
// err("Failed to send heartbeat", e.message);
}
break;
case "login":
try {
if (!data || data === "null" || !verifyToken(data))
return ws.close(code, `bad token ${data}`);
await track(ws, data);
} catch (e) {
if (e.message.includes("not found"))
ws.send(JSON.stringify({ type: "logout" }));
setTimeout(
() => ws?.close(code, `closing due to error ${e.message}`),
1000,
);
}
break;
case "token":
if (!ws.user) return;
ws.token = data;
break;
case "lnurl":
store.sessions[data] = ws;
break;
case "subscribe":
subscriptions.push({ invoice: data, ws });
break;
default:
// warn("received socket message of unknown type", type, data);
}
},
open(ws: any) {
const id = v4();
ws.id = id;
ws.beats = 0;
ws.send(JSON.stringify({ type: "connected", data: id }));
all[id] = ws;
},
close(ws: any) {
const { id } = ws;
try {
const uid = users[id];
if (store.sockets[uid]?.[id]) {
delete store.sockets[uid][id];
}
let i;
~(i = subscriptions.findIndex((s) => s.ws.id === id)) &&
subscriptions.splice(i, 1);
if (all[id]) delete all[id];
} catch (e) {
err("problem closing socket", e.message);
}
},
},
});
export const sendHeartbeat = () => {
for (const uid in store.sockets) {
for (const id in store.sockets[uid]) {
const ws = store.sockets[uid][id];
ws.beats++;
if (ws.beats > 10) ws.close(code, `${uid} ${id} lost heartbeat`);
}
}
};
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