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const btc = config.liquid.btcasset;
const withdrawalFeeMultiplier = 0.01; // 1% withdrawal fee
const withdrawalFeeReceiver = "coinosfees"; // account that receives the fees
module.exports = ah(async (req, res) => {
let { user } = req;
let { address, memo, tx } = req.body;
let { hex } = tx;
let fee = toSats(tx.fee);
if (fee < 0) throw new Error("fee cannot be negative");
const isChange = async ({ address }) =>
(await bc.getAddressInfo(address)).ismine &&
!Object.keys(addresses).includes(address);
tx = await bc.decodeRawTransaction(hex);
let total = 0;
let change = 0;
for (let i = 0; i < tx.vout.length; i++) {
let o = tx.vout[i];
total += toSats(o.value);
if (await isChange(o.scriptPubKey)) {
change += toSats(o.value);
}
}
total = total - change + fee;
let amount = total - fee;
// get withdrawal fee
// 'total' refers to the total before the withdrawal fee
// (i.e. the total bitcoin that leaves this server)
let withdrawalFee = amount * withdrawalFeeMultiplier;
try {
// withdraw bitcoin
await db.transaction(async transaction => {
let account = await db.Account.findOne({
where: {
id: user.account_id
},
lock: transaction.LOCK.UPDATE,
transaction
});
if (account.asset !== btc) {
account = await db.Account.findOne({
where: {
user_id: user.id,
asset: btc,
pubkey: null
},
lock: transaction.LOCK.UPDATE,
transaction
});
}
if (total > account.balance) {
l.error("amount exceeds balance", amount, fee, account.balance);
throw new Error("low balance");
} else if (total + withdrawalFee > account.balance) {
l.error("total (after withdrawal fee) exceeds balance", amount, fee, account.balance);
throw new Error("low balance (after withdrawal fee)");
}
await account.decrement({ balance: (total + withdrawalFee) }, { transaction });
await account.reload({ transaction });
let receiverAccount = await db.Account.findOne({
where: {
"$user.username$": withdrawalFeeReceiver
},
include: [
{
model: db.User,
as: "user"
},
],
lock: transaction.LOCK.UPDATE,
transaction
});
await receiverAccount.increment({ balance: withdrawalFee }, { transaction });
await receiverAccount.reload({ transaction });
let fee_payment = await db.Payment.create({
amount: withdrawalFee,
fee: 0,
memo: "Bitcoin withdrawal fee",
account_id: receiverAccount.id,
user_id: receiverAccount.user_id,
rate: app.get("rates")[receiverAccount.user.currency],
currency: receiverAccount.user.currency,
confirmed: true,
received: true,
network: "COINOS"
},
{ transaction }
);
// record the external bitcoin transaction
// no need to record the withdrawal fee - since that is internal only
let params = {
amount: -amount,
fee,
memo,
account_id: account.id,
user_id: user.id,
rate: app.get("rates")[user.currency],
currency: user.currency,
address,
confirmed: true,
received: false,
network: "bitcoin",
fee_payment_id: fee_payment.id
};
if (config.bitcoin.walletpass)
await bc.walletPassphrase(config.bitcoin.walletpass, 300);
hex = (await bc.signRawTransactionWithWallet(hex)).hex;
params.hash = await bc.sendRawTransaction(hex);
let payment = await db.Payment.create(params, { transaction });
payment = payment.get({ plain: true });
payment.account = account.get({ plain: true });
emit(user.username, "payment", payment);
res.send(payment);
payments.push(params.hash);
l.info("sent bitcoin", user.username, total);
});
} catch (e) {
if (e.message.includes("Insufficient")) e.message = "The coinos server hot wallet has insufficient funds to complete the payment, try again later";
l.error("error sending bitcoin", e.message);
console.log(e);
return res.status(500).send(e.message);
}
});
|
