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const bitcoin = require("bitcoinjs-lib");
const config = require("./config");
const reverse = require("buffer-reverse");
const BitcoinCore = require("bitcoin-core");
const l = require("pino")();
const SATS = 100000000;
const bc = new BitcoinCore(config.liquid);
module.exports = (app, db, emit) => async (req, res) => {
let { address, amount } = req.body;
let rawtx, hex, fee, total;
let { user } = req;
try {
amount = parseInt(amount);
rawtx = await bc.createRawTransaction([], {
[address]: (amount / SATS).toFixed(8)
});
rawtx = await bc.fundRawTransaction(rawtx, {
subtractFeeFromOutputs: amount === user.balance ? [0] : []
});
hex = await bc.blindRawTransaction(rawtx.hex);
({ fee } = rawtx);
fee = parseInt(fee * SATS);
total = amount + fee;
} catch (e) {
l.error("funding failed", e);
return res.status(500).send(e.message);
}
try {
await db.transaction(async transaction => {
let { balance } = await db.User.findOne({
where: {
username: user.username
},
lock: transaction.LOCK.UPDATE,
transaction
});
if (amount !== balance && total > balance) {
l.error("amount exceeds balance", amount, fee, balance);
throw new Error("insufficient funds");
}
req.user.balance -= total;
await user.save({ transaction });
});
} catch (e) {
l.error("balance check failed", e);
return res.status(500).send("Not enough satoshis");
}
try {
if (config.liquid.walletpass)
await bc.walletPassphrase(config.liquid.walletpass, 300);
rawtx = (await bc.signRawTransactionWithWallet(hex)).hex;
let txid = await bc.sendRawTransaction(rawtx);
await db.transaction(async transaction => {
await user.save({ transaction });
emit(user.username, "user", user);
const payment = await db.Payment.create(
{
amount: -total,
fee,
user_id: user.id,
hash: txid,
rate: app.get("rates")[user.currency],
currency: user.currency,
address,
confirmed: true,
received: false,
asset: 'LBTC'
},
{ transaction }
);
emit(user.username, "payment", payment);
res.send(payment);
});
} catch (e) {
l.error("liquid send failed", e);
return res.status(500).send(e.message);
}
};
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