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const bolt11 = require("bolt11");
const config = require("./config");
const l = console.log;
module.exports = (app, db, emit, seen, lna, lnb) => async (req, res) => {
let hash = req.body.payreq;
let payreq = bolt11.decode(hash);
let { route } = req.body;
let { user } = req;
l("sending lightning", user.username, payreq.satoshis);
if (seen.includes(hash)) {
return res.status(500).send("Invoice has been paid, can't pay again");
}
try {
await db.transaction(async transaction => {
let { balance } = await db.User.findOne(
{
where: {
username: user.username
}
},
{ transaction }
);
if (balance < payreq.satoshis) {
throw new Error();
}
user.balance -= payreq.satoshis;
await user.save({ transaction });
});
} catch (e) {
return res.status(500).send("Not enough satoshis");
}
let m;
try {
let paymentHash = payreq.tags.find(t => t.tagName === 'payment_hash').data;
m = await lna.sendToRouteSync({
"payment_hash": Buffer.from(paymentHash, 'hex'),
route
});
if (seen.includes(m.payment_preimage)) return;
seen.push(m.payment_preimage);
let total = parseInt(m.payment_route.total_amt);
let fee = m.payment_route.total_fees;
user.balance -= total - payreq.satoshis;
await db.transaction(async transaction => {
await user.save({ transaction });
const payment = await db.Payment.create(
{
amount: -total,
fee,
user_id: user.id,
hash,
rate: app.get("rates")[user.currency],
currency: user.currency,
confirmed: true,
asset: 'LNBTC',
},
{ transaction }
);
emit(user.username, "payment", payment);
emit(user.username, "user", user);
if (payreq.payeeNodeKey === config.lnb.id) {
let invoice = await lna.addInvoice({ value: payreq.satoshis });
let payback = lnb.sendPayment(lnb.meta, {});
/* eslint-disable-next-line */
let { payment_request } = invoice;
/* eslint-disable-next-line */
payback.write({ payment_request });
}
seen.push(hash);
res.send(payment);
});
} catch (e) {
l(e);
return res.status(500).send(e);
}
};
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