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import bc from "$lib/bitcoin";
import { emit } from "$lib/sockets";
import db from "$db";
import { toSats } from "$lib/utils";
import store from "$lib/store";
import config from "$config";
import { l, warn, err } from "$lib/logging";
import { requirePin } from "$lib/utils";
const btc = config.liquid.btcasset;
import {
computeConversionFee,
conversionFeeReceiver,
} from "./conversionFee.js";
export default async (req, res) => {
try {
await requirePin(req);
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(store.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 conversion fee
// 'total' refers to the total before the conversion fee
// (i.e. the total bitcoin that leaves this server)
let conversionFee = computeConversionFee(amount);
// withdraw bitcoin
await db.transaction(async (transaction) => {
let { account } = user;
if (account.asset !== btc) {
account = await db.Account.findOne({
where: {
user_id: user.id,
asset: btc,
pubkey: null,
},
lock: transaction.LOCK.UPDATE,
transaction,
});
}
// use user's credits to reduce fee, if available
let conversionFeeDeduction = Math.min(account.btc_credits, conversionFee);
if (conversionFeeDeduction) {
await account.decrement(
{ btc_credits: conversionFeeDeduction },
{ transaction }
);
await account.reload({ transaction });
conversionFee -= conversionFeeDeduction;
}
l(
"attempting to send bitcoin",
user.username,
account.id,
address,
total,
conversionFee,
conversionFeeDeduction
);
if (total > account.balance) {
err("amount exceeds balance", amount, fee, account.balance);
throw new Error("low");
} else if (total + conversionFee > account.balance) {
err(
"total (after conversion fee) exceeds balance",
amount,
fee,
account.balance
);
throw new Error("low");
}
await account.decrement(
{ balance: total + conversionFee },
{ transaction }
);
await account.reload({ transaction });
let receiverAccount = await db.Account.findOne({
where: {
"$user.username$": conversionFeeReceiver,
},
include: [
{
model: db.User,
as: "user",
},
],
lock: transaction.LOCK.UPDATE,
transaction,
});
let fee_payment;
let fee_payment_id = null;
if (conversionFee) {
await receiverAccount.increment(
{ balance: conversionFee },
{ transaction }
);
await receiverAccount.reload({ transaction });
fee_payment = await db.Payment.create(
{
amount: conversionFee,
fee: 0,
memo: "Bitcoin conversion fee",
account_id: receiverAccount.id,
user_id: receiverAccount.user_id,
rate: store.rates[receiverAccount.user.currency],
currency: receiverAccount.user.currency,
confirmed: true,
received: true,
network: "COINOS",
},
{ transaction }
);
fee_payment_id = fee_payment.id;
}
// record the external bitcoin transaction
let params = {
amount: -amount,
fee,
memo,
account_id: account.id,
user_id: user.id,
rate: store.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 });
payment.fee_payment = fee_payment && fee_payment.get({ plain: true });
emit(user.username, "payment", payment);
res.send(payment);
store.payments.push(params.hash);
l("sent bitcoin", user.username, total);
});
} catch (e) {
if (e.message.includes("Insufficient"))
e.message =
"Our server has insufficient funds, try again later";
if (e.message === "low") e.message = "Insufficient funds in account"
err("error sending bitcoin", e.message);
return res.code(500).send(e.message);
}
};
|
