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const btc = config.liquid.btcasset;
const lcad = config.liquid.cadasset;
const { Transaction } = require("@asoltys/liquidjs-lib");
sendLiquid = async ({ asset, amount, user, address, memo, tx, limit }) => {
l.info("sending liquid", amount, address);
if (!tx) {
({ tx } = await liquidTx({
address,
asset,
amount,
feeRate: 100,
replaceable: false,
user
}));
}
const isChange = async address =>
(await lq.getAddressInfo(address)).ismine &&
!Object.keys(addresses).includes(address);
let totals = {};
let change = {};
let fee = 0;
let { vout } = await lq.decodeRawTransaction(tx.hex);
for (let i = 0; i < vout.length; i++) {
let {
asset,
value,
scriptPubKey: { type, addresses }
} = vout[i];
if (type === "fee") fee = toSats(value);
else {
if (!totals[asset]) totals[asset] = change[asset] = 0;
totals[asset] += toSats(value);
if (addresses) {
if (await isChange(addresses[0])) {
change[asset] += toSats(value);
}
}
}
}
const assets = Object.keys(totals);
const payments = [];
let main, signed;
await db.transaction(async transaction => {
for (let i = 0; i < assets.length; i++) {
let asset = assets[i];
let amount = totals[asset];
if (change[asset]) amount -= change[asset];
let total = amount;
if (asset === btc) {
let covered = 0;
let nonbtc = assets.filter(a => a !== btc);
if (nonbtc.length === 1) {
let faucet = await db.Account.findOne({
where: {
asset: nonbtc[0],
user_id: null
},
lock: transaction.LOCK.UPDATE,
transaction
});
if (faucet) {
covered = faucet.balance;
if (covered > fee) covered = fee;
await faucet.decrement({ balance: covered }, { transaction });
await faucet.reload({ transaction });
await faucet.save({ transaction });
}
}
total += fee - covered;
}
if (limit && total > limit + fee)
throw new Error("Tx amount exceeds authorized amount");
if (asset !== btc || total) {
l.info("creating liquid payment", user.username, asset, total, fee);
let account = await db.Account.findOne({
where: {
user_id: user.id,
asset,
pubkey: null
},
lock: transaction.LOCK.UPDATE,
order: [["balance", "DESC"]],
transaction
});
if (total > account.balance) {
l.warn("amount exceeds balance", {
total,
fee,
balance: account.balance
});
throw new Error(
`Insufficient funds, need ${total} ${
account.ticker === "BTC" ? "SAT" : account.ticker
}, have ${account.balance}`
);
}
await account.decrement({ balance: total }, { transaction });
await account.reload({ transaction });
let payment = {
amount: -amount,
account_id: account.id,
fee,
memo,
user_id: user.id,
rate: app.get("rates")[user.currency],
currency: user.currency,
address,
confirmed: true,
received: false,
network: "liquid"
};
payment.account = account;
payments.push(payment);
}
}
signed = await lq.signRawTransactionWithWallet(
await lq.blindRawTransaction(tx.hex)
);
let txid = Transaction.fromHex(signed.hex).getId();
for (let i = 0; i < assets.length; i++) {
p = payments[i];
if (p) {
let { account } = p;
p.hash = txid;
p = await db.Payment.create(p, { transaction });
if (account.ticker !== "BTC" || !main) {
main = p.get({ plain: true });
main.account = account.get({ plain: true });
}
}
}
emit(user.username, "account", main.account);
emit(user.username, "payment", main);
});
if (config.liquid.walletpass)
await lq.walletPassphrase(config.liquid.walletpass, 300);
let txid = await lq.sendRawTransaction(signed.hex);
l.info("sent liquid tx", txid, address);
return main;
};
module.exports = ah(async (req, res) => {
let { user } = req;
try {
res.send(await sendLiquid({ ...req.body, user }));
} catch (e) {
l.error("problem sending liquid", user.username, e.message);
return res.status(500).send(e);
}
});
|
