btcOperator v1.0.7a
- Adding auto fee calculation - Optimized the code - Fixed minor bugs
This commit is contained in:
sairajzero
parent
4244774635
commit
bc44405102
133
btcOperator.js
133
btcOperator.js
@ -1,4 +1,4 @@
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(function(EXPORTS) { //btcOperator v1.0.7
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(function(EXPORTS) { //btcOperator v1.0.7a
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/* BTC Crypto and API Operator */
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const btcOperator = EXPORTS;
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@ -16,6 +16,21 @@
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})
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};
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const SIGN_SIZE = 73;
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function get_fee_rate() {
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return new Promise((resolve, reject) => {
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fetch('https://api.blockchain.info/mempool/fees').then(response => {
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if (response.ok)
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response.json()
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.then(result => resolve(result.regular))
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.catch(error => reject(error));
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else
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reject(response);
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}).catch(error => reject(error))
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})
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}
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const broadcast = btcOperator.broadcast = rawtx => new Promise((resolve, reject) => {
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$.ajax({
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type: "POST",
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@ -229,7 +244,7 @@
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if (parameters.change_addr && !validateAddress(parameters.change_addr))
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throw "Invalid change_address:" + parameters.change_addr;
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//fee and amounts
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if (typeof parameters.fee !== "number" || parameters.fee <= 0)
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if ((typeof parameters.fee !== "number" || parameters.fee <= 0) && parameters.fee !== null) //fee = null (auto calc)
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throw "Invalid fee:" + parameters.fee;
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if (!Array.isArray(parameters.amounts))
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parameters.amounts = [parameters.amounts];
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@ -242,6 +257,32 @@
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return parameters;
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}
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const TMP_FEE = 0.00001;
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function createTransaction(senders, redeemScripts, receivers, amounts, fee, change_addr) {
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let auto_fee = false,
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total_amount = parseFloat(amounts.reduce((t, a) => t + a, 0).toFixed(8));
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if (fee === null) {
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auto_fee = true;
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fee = TMP_FEE;
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}
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const tx = coinjs.transaction();
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addUTXOs(tx, senders, redeemScripts, total_amount + fee).then(result => {
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if (result > 0)
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return reject("Insufficient Balance");
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let change = addOutputs(tx, receivers, amounts, Math.abs(result), change_addr);
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if (!auto_fee)
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return resolve(tx);
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autoFeeCalc(tx).then(fee_calc => {
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fee = Math.round((fee * 1) * 1e8); //satoshi convertion
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if (!change)
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tx.addoutput(change_addr, 0);
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editFee(tx, fee, fee_calc);
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resolve(tx);
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}).catch(error => reject(error))
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})
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}
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function addUTXOs(tx, senders, redeemScripts, required_amount, n = 0) {
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return new Promise((resolve, reject) => {
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required_amount = parseFloat(required_amount.toFixed(8));
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@ -277,8 +318,47 @@
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function addOutputs(tx, receivers, amounts, change, change_addr) {
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for (let i in receivers)
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tx.addoutput(receivers[i], amounts[i]);
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if (parseFloat(change.toFixed(8)) > 0)
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tx.addoutput(change_addr || senders[0], change);
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if (parseFloat(change.toFixed(8)) > 0) {
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tx.addoutput(change_addr, change);
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return true;
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} else
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return false;
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}
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function autoFeeCalc(tx) {
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return new Promise((resolve, reject) => {
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get_fee_rate().then(fee_rate => {
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let tx_size = tx.size();
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for (var i = 0; i < this.ins.length; i++)
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switch (tx.extractScriptKey(i).type) {
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case 'scriptpubkey':
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tx_size += SIGN_SIZE;
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break;
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case 'segwit':
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case 'multisig':
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tx_size += SIGN_SIZE * 0.25;
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break;
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default:
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console.warn('Unknown script-type');
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tx_size += SIGN_SIZE;
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}
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resolve(tx_size * fee_rate);
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}).catch(error => reject(error))
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})
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}
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function editFee(tx, current_fee, target_fee, index = -1) {
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//values are in satoshi
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index = parseInt(index >= 0 ? index : tx.out.length - index);
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if (index < 0 || index >= tx.out.length)
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throw "Invalid index";
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let edit_value = parseInt(current_fee - target_fee), //rip of any decimal places
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current_value = tx.out[index].value; //could be BigInterger
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if (edit_value < 0 && edit_value > current_value)
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throw "Insufficient value at vout";
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tx.out[index].value = current_value instanceof BigInteger ?
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current_value.add(new BigInteger('' + edit_value)) : parseInt(current_value + edit_value);
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}
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btcOperator.sendTx = function(senders, privkeys, receivers, amounts, fee, change_addr = null) {
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@ -299,8 +379,7 @@
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} catch (e) {
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return reject(e)
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}
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let total_amount = parseFloat(amounts.reduce((t, a) => t + a, 0).toFixed(8)),
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redeemScripts = [],
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let redeemScripts = [],
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wif_keys = [];
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for (let i in senders) {
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let rs = _redeemScript(senders[i], privkeys[i]); //get redeem-script (segwit/bech32)
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@ -309,26 +388,20 @@
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}
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if (redeemScripts.includes(null)) //TODO: segwit
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return reject("Unable to get redeem-script");
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//create transaction
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const tx = coinjs.transaction();
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addUTXOs(tx, senders, redeemScripts, total_amount + fee).then(result => {
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if (result > 0)
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return reject("Insufficient Balance");
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addOutputs(tx, receivers, amounts, Math.abs(result), change_addr || senders[0])
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createTransaction(senders, redeemScripts, receivers, amounts, fee, change_addr || senders[0]).then(tx => {
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console.debug("Unsigned:", tx.serialize());
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new Set(wif_keys).forEach(key => console.debug("Signing key:", key, tx.sign(key, 1 /*sighashtype*/ ))); //Sign the tx using private key WIF
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console.debug("Signed:", tx.serialize());
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debugger;
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broadcast(tx.serialize())
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.then(result => resolve(result))
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.catch(error => reject(error));
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});
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}).catch(error => reject(error));
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})
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}
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btcOperator.createTx = function(senders, receivers, amounts, fee, change_addr = null) {
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btcOperator.createTx = function(senders, receivers, amounts, fee = null, change_addr = null) {
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return new Promise((resolve, reject) => {
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try {
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({
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@ -345,25 +418,18 @@
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} catch (e) {
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return reject(e)
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}
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let total_amount = parseFloat(amounts.reduce((t, a) => t + a, 0).toFixed(8)),
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redeemScripts = senders.map(id => _redeemScript(id));
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let redeemScripts = senders.map(id => _redeemScript(id));
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if (redeemScripts.includes(null)) //TODO: segwit
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return reject("Unable to get redeem-script");
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//create transaction
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const tx = coinjs.transaction();
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addUTXOs(tx, senders, redeemScripts, total_amount + fee).then(result => {
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if (result > 0)
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return reject("Insufficient Balance");
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addOutputs(tx, receivers, amounts, Math.abs(result), change_addr || senders[0])
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resolve(tx.serialize());
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})
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createTransaction(senders, redeemScripts, receivers, amounts, fee, change_addr || senders[0])
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.then(tx => resolve(tx.serialize()))
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.catch(error => reject(error))
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})
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}
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btcOperator.createMultiSigTx = function(sender, redeemScript, receivers, amounts, fee) {
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return new Promise((resolve, reject) => {
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//validate tx parameters
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if (validateAddress(sender) !== "multisig")
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return reject("Invalid sender (multisig):" + sender);
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@ -380,22 +446,15 @@
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} = validateTxParameters({
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receivers,
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amounts,
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fee,
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change_addr
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fee
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}));
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} catch (e) {
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return reject(e)
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}
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let total_amount = parseFloat(amounts.reduce((t, a) => t + a, 0).toFixed(8))
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//create transaction
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const tx = coinjs.transaction();
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addUTXOs(tx, senders, redeemScript, total_amount + fee).then(result => {
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if (result > 0)
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return reject("Insufficient Balance");
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addOutputs(tx, receivers, amounts, Math.abs(result), sender);
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resolve(tx.serialize());
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})
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createTransaction([sender], [redeemScript], receivers, amounts, fee, sender)
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.then(tx => resolve(tx.serialize()))
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.catch(error => reject(error))
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})
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}
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