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const bitcoin = require("bitcoinjs-lib");
const config = require("./config");
const reverse = require("buffer-reverse");
const l = console.log;
module.exports = (app, bc, db, emit) => async (req, res) => {
const MINFEE = 3000;
let { address, amount } = req.body;
l("sending coins", req.user.username, amount, address);
if (amount === req.user.balance) {
amount = req.user.balance - MINFEE;
}
try {
await db.transaction(async transaction => {
let { balance } = await db.User.findOne(
{
where: {
username: req.user.username
}
},
{ transaction }
);
if (amount > balance) {
l("amount exceeds balance", amount, balance);
throw new Error("insufficient funds");
}
req.user.balance -= parseInt(amount) + 10000;
await req.user.save({ transaction });
});
} catch (e) {
return res.status(500).send("Not enough satoshis");
}
try {
if (config.bitcoin.walletpass)
await bc.walletPassphrase(config.bitcoin.walletpass, 300);
let txid = await bc.sendToAddress(address, (amount / 100000000).toFixed(8));
let txhex = await bc.getRawTransaction(txid);
let tx = bitcoin.Transaction.fromHex(txhex);
let inputTotal = await tx.ins.reduce(async (a, input) => {
let h = await bc.getRawTransaction(reverse(input.hash).toString("hex"));
return a + bitcoin.Transaction.fromHex(h).outs[input.index].value;
}, 0);
let outputTotal = tx.outs.reduce((a, b) => a + b.value, 0);
let fees = inputTotal - outputTotal;
let total = Math.min(parseInt(amount) + fees, req.user.balance);
req.user.balance += 10000 - fees;
if (req.user.balance < 0) req.user.balance = 0;
await db.transaction(async transaction => {
await req.user.save({ transaction });
emit(req.user.username, "user", req.user);
await db.Payment.create(
{
amount: -total,
user_id: req.user.id,
hash: txid,
rate: app.get("rates").ask,
currency: "CAD"
},
{ transaction }
);
});
res.send({ txid, tx, amount, fees });
} catch (e) {
l(e);
res.status(500).send(e.message);
}
};
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