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import config from "$config";
import store from "$lib/store";
import jwt from "jsonwebtoken";
import { v4 } from "uuid";
import whitelist from "./whitelist";
import { l, err, warn } from "$lib/logging";
import { g } from "$lib/db";
import { pick } from "$lib/utils";
const code = 1000;
const all = {};
const subscriptions = [];
const lastSeen = {};
const users = {};
export const emit = (uid, type, data) => {
if (type === "payment" && data.amount > 0) {
for (let i = subscriptions.length - 1; i >= 0; i--) {
let s = subscriptions[i];
if (s.hash === data.hash) {
s.ws.send(JSON.stringify({ type, data }));
}
}
}
if (!store.sockets[uid]) return;
for (let id in store.sockets[uid]) {
const ws = store.sockets[uid][id];
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 => {
if (!sent.includes(ws.id)) ws.send(JSON.stringify({ type, data }));
});
};
export async function socketServer(app) {
let seconds = (n, d = new Date()) => d.setSeconds(d.getSeconds() - n) && d;
app.get("/ws", { websocket: true }, ({ socket: ws }, req) => {
const id = v4();
ws.id = id;
ws.beats = 0;
ws.send(JSON.stringify({ type: "connected", data: id }));
all[id] = ws;
ws.on("message", async message => {
let type, data;
try {
({ type, data } = JSON.parse(message));
} catch (e) {
err("coudn't parse socket message");
}
switch (type) {
case "heartbeat":
ws.beats = 0;
ws.send(JSON.stringify({ type: "id", data: ws.id }));
break;
case "login":
let token = data;
if (lastSeen[token] > seconds(5)) return;
lastSeen[token] = new Date();
try {
if (!token || token === "null" || !jwt.decode(token))
return ws.close(code, `bad token ${token}`);
let { id: uid } = jwt.decode(token);
if (!uid) throw new Error("Invalid JWT token");
let user = await g(`user:${uid}`);
if (!user) throw new Error("User not found");
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].send(JSON.stringify({ type: "logout" }));
setTimeout(() => {
if (store.sockets[uid][p])
store.sockets[uid][p].close(code, "too many sockets");
}, 5000);
}
store.sockets[uid][id] = ws;
users[id] = uid;
ws.user = user;
ws.send(
JSON.stringify({ type: "login", data: pick(user, whitelist) })
);
ws.send(
JSON.stringify({ type: "version", data: config.clientVersion })
);
} catch (e) {
console.log(e);
err("caught socket error", e.message);
if (e.message.includes("not found"))
ws.send(JSON.stringify({ type: "logout" }));
setTimeout(
() => ws && ws.close(code, `closing due to error ${e.message}`),
1000
);
}
break;
case "token":
if (!ws.user) return;
ws.token = data;
break;
case "lnurl":
store.sessions[data] = ws;
break;
case "subscribe":
subscriptions.push({ invoice: data, ws });
break;
default:
warn("received socket message of unknown type", type, data);
}
});
ws.on("close", function(code, reason) {
try {
const uid = users[id];
if (store.sockets[uid] && store.sockets[uid][id]) {
delete store.sockets[uid][id];
}
if (all[id]) delete all[id];
} catch (e) {
err("problem closing socket", e.message);
}
});
});
}
export let sendHeartbeat = () => {
for (const uid in store.sockets) {
for (const id in store.sockets[uid]) {
let ws = store.sockets[uid][id];
ws.beats++;
if (ws.beats > 10) ws.close(code, `${uid} ${id} lost heartbeat`);
}
}
};
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