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const jwt = require("jsonwebtoken");
const uuidv4 = require("uuid/v4");
const WebSocket = require("ws");
const { differenceInSeconds, subSeconds } = require("date-fns");
wss = new WebSocket.Server({ clientTracking: false, noServer: true });
/* eslint-disable-next-line */
const pick = (O, ...K) => K.reduce((o, k) => ((o[k] = O[k]), o), {});
const all = {};
const subscriptions = [];
const lastSeen = {};
emit = (username, type, data) => {
if (data.username !== undefined) data = pick(data, ...whitelist);
if (type === "payment" && data.amount > 0) {
for (let i = subscriptions.length - 1; i >= 0; i--) {
let s = subscriptions[i];
if (
s.invoice.amount === data.amount ||
s.invoice.address === data.address ||
s.invoice.unconfidential === data.address
) {
s.ws.send(JSON.stringify({ type, data }));
subscriptions.splice(i, 1);
}
}
}
if (!sockets[username]) return;
for (id in sockets[username]) {
const ws = sockets[username][id];
ws.send(JSON.stringify({ type, data }));
}
};
broadcast = (type, data) => {
const sent = [];
for (const username in sockets) {
for (const id in sockets[username]) {
const ws = sockets[username][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 }));
});
};
server.on("upgrade", function(req, socket, head) {
wss.handleUpgrade(req, socket, head, function(ws) {
wss.emit("connection", ws, req);
});
});
const names = {};
setInterval(() => {
for (const username in sockets) {
for (const id in sockets[username]) {
let ws = sockets[username][id];
ws.beats++;
if (ws.beats > 10) ws.close();
}
}
}, 2000);
wss.on("connection", function(ws, req) {
const id = uuidv4();
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) {
l.error("coudn't parse socket message");
}
switch (type) {
case "heartbeat":
ws.beats = 0;
break;
case "login":
let token = data;
if (differenceInSeconds(new Date(), lastSeen[token]) < 5) return;
lastSeen[token] = new Date();
try {
if (!token || token === "null" || !jwt.decode(token)) return ws.close();
const username = jwt.decode(token).username;
if (!username) throw new Error("Invalid JWT token");
if (!sockets[username]) sockets[username] = {};
const existing = Object.keys(sockets[username]);
if (existing.length > 4) {
const p = existing.find(sid => sid !== id);
sockets[username][p].send(JSON.stringify({ type: "logout" }));
setTimeout(() => {
if (sockets[username][p]) sockets[username][p].close();
}, 5000);
}
sockets[username][id] = ws;
names[id] = username;
let user = await getUser(username);
if (user.locked) throw new Error("Account is locked");
let payments = await user.getPayments({
where: {
account_id: user.account_id
},
order: [["id", "DESC"]],
limit: 12,
include: {
model: db.Account,
as: "account"
}
});
let accounts = await user.getAccounts();
let keys = await user.getKeys();
user = user.get({ plain: true });
user.accounts = accounts;
user.keys = keys;
user.payments = payments;
ws.user = user;
ws.send(JSON.stringify({ type: "login", data: user }));
ws.send(
JSON.stringify({ type: "version", data: config.clientVersion })
);
} catch (e) {
l.error("caught socket error", e.message);
if (e.message.includes("locked")) {
ws.send(JSON.stringify({ type: "locked" }));
ws.send(JSON.stringify({ type: "logout" }));
}
if (e.message.includes("not found"))
ws.send(JSON.stringify({ type: "logout" }));
setTimeout(() => ws && ws.close(), 1000);
}
break;
case "token":
if (!ws.user) return;
ws.token = data;
break;
case "lnurl":
sessions[data] = ws;
break;
case "updateMemo":
const payment = await db.Payment.findOne({
where: {
user_id: ws.user.id,
id: data.id
},
include: {
model: db.Account,
as: "account"
}
});
if (payment) {
payment.memo = data.memo;
await payment.save();
emit(ws.user.username, "payment", payment);
}
break;
case "subscribe":
subscriptions.push({ invoice: data, ws });
break;
default:
l.warn("received socket message of unknown type", type, data);
}
});
ws.on("close", function() {
try {
const username = names[id];
if (sockets[username] && sockets[username][id]) {
delete sockets[username][id];
}
if (all[id]) delete all[id];
} catch (e) {
l.error("problem closing socket", e.message);
}
});
});
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