forked from sairajzero/flo-standard-operations
/
btcOperator.js
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/
btcOperator.js
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(function (EXPORTS) { //btcOperator v1.2.10
/* BTC Crypto and API Operator */
const btcOperator = EXPORTS;
const SATOSHI_IN_BTC = 1e8;
const util = btcOperator.util = {};
util.Sat_to_BTC = value => parseFloat((value / SATOSHI_IN_BTC).toFixed(8));
util.BTC_to_Sat = value => parseInt(value * SATOSHI_IN_BTC);
const checkIfTor = btcOperator.checkIfTor = () => {
return fetch('https://check.torproject.org/api/ip')
.then(res => res.json())
.then(res => {
return res.IsTor
}).catch(e => {
console.error(e)
return false
})
}
let isTor = false;
checkIfTor().then(result => isTor = result);
async function post(url, data, { asText = false } = {}) {
try {
const response = await fetch(url, {
method: 'POST',
mode: 'no-cors',
headers: {
'Content-Type': 'application/json'
},
body: JSON.stringify(data)
})
if (response.ok) {
return asText ? await response.text() : await response.json()
} else {
throw response
}
} catch (e) {
throw e
}
}
// NOTE: some APIs may not support all functions properly hence they are omitted
const APIs = btcOperator.APIs = [
{
url: 'https://api.blockcypher.com/v1/btc/main/',
name: 'Blockcypher',
balance({ addr }) {
return fetch_api(`addrs/${addr}/balance`, { url: this.url })
.then(result => util.Sat_to_BTC(result.balance))
},
async block({ id }) {
try {
let block = await fetch_api(`blocks/${id}`, { url: this.url })
return formatBlock(block)
} catch (e) {
console.log(e)
}
},
async broadcast({ rawTxHex, url }) {
try {
const result = await post(`${url || this.url}pushtx`, { tx: rawTxHex })
return result.hash
} catch (e) {
throw e
}
}
},
{
url: 'https://blockstream.info/api/',
name: 'Blockstream',
hasOnion: true,
onionUrl: `http://explorerzydxu5ecjrkwceayqybizmpjjznk5izmitf2modhcusuqlid.onion/api/`,
balance({ addr, url }) {
return fetch_api(`address/${addr}/utxo`, { url: url || this.url })
.then(result => {
const balance = result.reduce((t, u) => t + u.value, 0)
return util.Sat_to_BTC(balance)
})
},
latestBlock() {
return fetch_api(`blocks/tip/height`, { url: this.url })
},
tx({ txid, url }) {
return fetch_api(`tx/${txid}`, { url: url || this.url })
.then(result => formatTx(result))
},
txHex({ txid, url }) {
return fetch_api(`tx/${txid}/hex`, { url: url || this.url, asText: true })
},
txs({ addr, url, ...args }) {
let queryParams = Object.entries(args).map(([key, value]) => `${key}=${value}`).join('&')
if (queryParams)
queryParams = '?' + queryParams
return fetch_api(`address/${addr}/txs${queryParams}`, { url: url || this.url })
},
async block({ id, url }) {
// if id is hex string then it is block hash
try {
let blockHash = id
if (!/^[0-9a-f]{64}$/i.test(id))
blockHash = await fetch_api(`block-height/${id}`, { url: url || this.url, asText: true })
const block = await fetch_api(`block/${blockHash}`, { url: url || this.url })
return formatBlock(block)
} catch (e) {
throw e
}
},
async broadcast({ rawTxHex, url }) {
return post(`${url || this.url}tx`, { tx: rawTxHex }, { asText: true })
}
},
{
url: 'https://mempool.space/api/',
name: 'Mempool',
balance({ addr }) {
return fetch_api(`address/${addr}`, { url: this.url })
.then(result => util.Sat_to_BTC(result.chain_stats.funded_txo_sum - result.chain_stats.spent_txo_sum))
},
latestBlock() {
return fetch_api(`blocks/tip/height`, { url: this.url })
},
tx({ txid }) {
return fetch_api(`tx/${txid}`, { url: this.url })
.then(result => formatTx(result))
},
txHex({ txid }) {
return fetch_api(`tx/${txid}/hex`, { url: this.url, asText: true })
},
txs({ addr, ...args }) {
let queryParams = Object.entries(args).map(([key, value]) => `${key}=${value}`).join('&')
if (queryParams)
queryParams = '?' + queryParams
return fetch_api(`address/${addr}/txs${queryParams}`, { url: this.url })
},
async block({ id }) {
// if id is hex string then it is block hash
try {
let blockHash = id
if (!/^[0-9a-f]{64}$/i.test(id))
blockHash = await fetch_api(`block-height/${id}`, { url: this.url, asText: true })
const block = await fetch_api(`block/${blockHash}`, { url: this.url })
return formatBlock(block)
} catch (e) {
throw e
}
},
async broadcast({ rawTxHex, url }) {
return post(`${url || this.url}tx`, { tx: rawTxHex }, { asText: true })
}
},
{
url: 'https://blockchain.info/',
name: 'Blockchain',
balance({ addr }) {
return fetch_api(`q/addressbalance/${addr}`, { url: this.url })
.then(result => util.Sat_to_BTC(result))
},
unspent({ addr, allowUnconfirmedUtxos = false }) {
return fetch_api(`unspent?active=${addr}`, { url: this.url })
.then(result => formatUtxos(result.unspent_outputs, allowUnconfirmedUtxos))
},
tx({ txid }) {
return fetch_api(`rawtx/${txid}`, { url: this.url })
.then(result => formatTx(result))
},
txHex({ txid }) {
return fetch_api(`rawtx/${txid}?format=hex`, { url: this.url, asText: true })
},
txs({ addr, ...args }) {
let queryParams = Object.entries(args).map(([key, value]) => `${key}=${value}`).join('&')
if (queryParams)
queryParams = '?' + queryParams
return fetch_api(`rawaddr/${addr}${queryParams}`, { url: this.url })
.then(result => result.txs)
},
latestBlock() {
return fetch_api(`q/getblockcount`, { url: this.url })
},
async block({ id }) {
try {
let block
// if id is hex string then it is block hash
if (/^[0-9a-f]{64}$/i.test(id))
block = await fetch_api(`rawblock/${id}`, { url: this.url })
else {
const result = await fetch_api(`block-height/${id}?format=json`, { url: this.url })
block = result.blocks[0]
}
return formatBlock(block)
} catch (e) {
throw e
}
},
async blockTxs({ id }) {
try {
let block
// if id is hex string then it is block hash
if (/^[0-9a-f]{64}$/i.test(id))
block = await fetch_api(`rawblock/${id}`, { url: this.url })
else {
const result = await fetch_api(`block-height/${id}?format=json`, { url: this.url })
block = result.blocks[0]
}
return block.tx
} catch (e) {
}
}
},
{
url: 'https://coinb.in/api/?uid=1&key=12345678901234567890123456789012&setmodule=bitcoin&request=sendrawtransaction',
name: 'Coinb.in',
broadcast({ rawTxHex }) {
return new Promise((resolve, reject) => {
fetch(this.url, {
method: 'POST',
headers: {
'Content-Type': 'application/x-www-form-urlencoded'
},
body: "rawtx=" + rawTxHex
}).then(response => {
console.log(response)
response.text().then(resultText => {
let r = resultText.match(/<result>.*<\/result>/);
if (!r)
reject(resultText);
else {
r = r.pop().replace('<result>', '').replace('</result>', '');
if (r == '1') {
let txid = resultText.match(/<txid>.*<\/txid>/).pop().replace('<txid>', '').replace('</txid>', '');
resolve(txid);
} else if (r == '0') {
let error
if (resultText.includes('<message>')) {
error = resultText.match(/<message>.*<\/message>/).pop().replace('<message>', '').replace('</message>', '');
} else {
error = resultText.match(/<response>.*<\/response>/).pop().replace('<response>', '').replace('</response>', '');
}
reject(decodeURIComponent(error.replace(/\+/g, " ")));
} else reject(resultText);
}
}).catch(error => reject(error))
}).catch(error => reject(error))
});
}
}
]
btcOperator.util.format = {} // functions to homogenize API results
const formatBlock = btcOperator.util.format.block = async (block) => {
try {
const { height, hash, id, time, timestamp, mrkl_root, merkle_root, prev_block, next_block, size } = block;
const details = {
height,
hash: hash || id,
time: (time || timestamp) * 1000,
merkle_root: merkle_root || mrkl_root,
size,
}
if (prev_block)
details.prev_block = prev_block
if (next_block)
details.next_block = next_block[0]
return details
} catch (e) {
throw e
}
}
const formatUtxos = btcOperator.util.format.utxos = async (utxos, allowUnconfirmedUtxos = false) => {
try {
if (!allowUnconfirmedUtxos && !utxos || !Array.isArray(utxos))
throw {
message: "No utxos found",
code: 1000 //error code for when issue is not from API but situational (like no utxos found)
}
return utxos.map(utxo => {
const { tx_hash, tx_hash_big_endian, txid, tx_output_n, vout, value, script, confirmations, status: { confirmed } = {} } = utxo;
return {
confirmations: confirmations || confirmed,
tx_hash_big_endian: tx_hash_big_endian || tx_hash || txid,
tx_output_n: tx_output_n || vout,
value,
script
}
})
} catch (e) {
throw e
}
}
const formatTx = btcOperator.util.format.tx = async (tx) => {
try {
let { txid, hash, time, block_height, fee, fees, received,
confirmed, size, double_spend, block_hash, confirmations,
status: { block_height: statusBlockHeight, block_hash: statusBlockHash, block_time } = {}
} = tx;
if ((block_height || statusBlockHeight) && confirmations === undefined || confirmations === null) {
const latestBlock = await multiApi('latestBlock');
confirmations = latestBlock - (block_height || statusBlockHeight);
}
const inputs = tx.vin || tx.inputs;
const outputs = tx.vout || tx.outputs || tx.out;
return {
hash: hash || txid,
size: size,
fee: fee || fees,
double_spend,
time: (time * 1000) || new Date(confirmed || received).getTime() || block_time * 1000 || Date.now(),
block_height: block_height || statusBlockHeight,
block_hash: block_hash || statusBlockHash,
confirmations,
inputs: inputs.map(input => {
return {
index: input.n || input.output_index || input.vout,
prev_out: {
addr: input.prev_out?.addr || input.addresses?.[0] || input.prev_out?.address || input.addr || input.prevout.scriptpubkey_address,
value: input.prev_out?.value || input.output_value || input.prevout.value,
},
}
}),
out: outputs.map(output => {
return {
addr: output.scriptpubkey_address || output.addresses?.[0] || output.scriptpubkey_address || output.addr,
value: output.value || output.scriptpubkey_value,
}
})
}
} catch (e) {
throw e
}
}
const multiApi = btcOperator.multiApi = async (fnName, { index = 0, ...args } = {}) => {
try {
let triedOnion = false;
while (index < APIs.length) {
if (!APIs[index][fnName] || (APIs[index].coolDownTime && APIs[index].coolDownTime > new Date().getTime())) {
index += 1;
continue;
}
return await APIs[index][fnName](args);
}
if (isTor && !triedOnion) {
triedOnion = true;
index = 0;
while (index < APIs.length) {
if (!APIs[index].hasOnion || (APIs[index].coolDownTime && APIs[index].coolDownTime > new Date().getTime())) {
index += 1;
continue;
}
return await multiApi(fnName, { index: index + 1, ...args, url: APIs[index].onionUrl });
}
}
throw "No API available"
} catch (error) {
console.error(error)
APIs[index].coolDownTime = new Date().getTime() + 1000 * 60 * 10; // 10 minutes
return multiApi(fnName, { index: index + 1, ...args });
}
};
function parseTx(tx, addressOfTx) {
const { txid, hash, time, block_height, inputs, outputs, out, vin, vout, fee, fees, received, confirmed, status: { block_height: statusBlockHeight, block_time } = {} } = tx;
let parsedTx = {
txid: hash || txid,
time: (time * 1000) || new Date(confirmed || received).getTime() || block_time * 1000 || Date.now(),
block: block_height || statusBlockHeight,
}
//sender list
parsedTx.tx_senders = {};
(inputs || vin).forEach(i => {
const address = i.prev_out?.addr || i.addresses?.[0] || i.prev_out?.address || i.addr || i.prevout.scriptpubkey_address;
const value = i.prev_out?.value || i.output_value || i.value || i.prevout.value;
if (address in parsedTx.tx_senders)
parsedTx.tx_senders[address] += value;
else parsedTx.tx_senders[address] = value;
});
parsedTx.tx_input_value = 0;
for (let senderAddr in parsedTx.tx_senders) {
let val = parsedTx.tx_senders[senderAddr];
parsedTx.tx_senders[senderAddr] = util.Sat_to_BTC(val);
parsedTx.tx_input_value += val;
}
parsedTx.tx_input_value = util.Sat_to_BTC(parsedTx.tx_input_value);
//receiver list
parsedTx.tx_receivers = {};
(outputs || out || vout).forEach(o => {
const address = o.scriptpubkey_address || o.addresses?.[0] || o.scriptpubkey_address || o.addr;
const value = o.value || o.scriptpubkey_value;
if (address in parsedTx.tx_receivers)
parsedTx.tx_receivers[address] += value;
else parsedTx.tx_receivers[address] = value;
});
parsedTx.tx_output_value = 0;
for (let receiverAddr in parsedTx.tx_receivers) {
let val = parsedTx.tx_receivers[receiverAddr];
parsedTx.tx_receivers[receiverAddr] = util.Sat_to_BTC(val);
parsedTx.tx_output_value += val;
}
parsedTx.tx_output_value = util.Sat_to_BTC(parsedTx.tx_output_value);
// tx fee
parsedTx.tx_fee = util.Sat_to_BTC(fee || fees || (parsedTx.tx_input_value - parsedTx.tx_output_value));
//detect tx type (in, out, self)
if (Object.keys(parsedTx.tx_receivers).length === 1 && Object.keys(parsedTx.tx_senders).length === 1 && Object.keys(parsedTx.tx_senders)[0] === Object.keys(parsedTx.tx_receivers)[0]) {
parsedTx.type = 'self';
parsedTx.amount = parsedTx.tx_receivers[addressOfTx];
parsedTx.address = addressOfTx;
} else if (addressOfTx in parsedTx.tx_senders && Object.keys(parsedTx.tx_receivers).some(addr => addr !== addressOfTx)) {
parsedTx.type = 'out';
parsedTx.receiver = Object.keys(parsedTx.tx_receivers).filter(addr => addr != addressOfTx);
parsedTx.amount = parsedTx.receiver.reduce((t, addr) => t + parsedTx.tx_receivers[addr], 0) + parsedTx.tx_fee;
} else {
parsedTx.type = 'in';
parsedTx.sender = Object.keys(parsedTx.tx_senders).filter(addr => addr != addressOfTx);
parsedTx.amount = parsedTx.tx_receivers[addressOfTx];
}
return parsedTx;
}
const DUST_AMT = 546,
MIN_FEE_UPDATE = 219;
const fetch_api = btcOperator.fetch = function (api, { asText = false, url = 'https://blockchain.info/' } = {}) {
return new Promise((resolve, reject) => {
console.debug(url + api);
fetch(url + api).then(response => {
if (response.ok) {
(asText ? response.text() : response.json())
.then(result => resolve(result))
.catch(error => reject(error))
} else {
response.json()
.then(result => reject(result))
.catch(error => reject(error))
}
}).catch(error => reject(error))
})
};
function get_fee_rate() {
return new Promise((resolve, reject) => {
fetch('https://api.blockchain.info/mempool/fees').then(response => {
if (response.ok)
response.json()
.then(result => resolve(util.Sat_to_BTC(result.regular)))
.catch(error => reject(error));
else
reject(response);
}).catch(error => reject(error))
})
}
const broadcastTx = btcOperator.broadcastTx = rawTxHex => new Promise((resolve, reject) => {
console.log('txHex:', rawTxHex)
// return multiApi('broadcast', { rawTxHex })
// .then(result => {
// resolve(result)
// })
// .catch(error => {
// reject(error)
// })
let url = 'https://coinb.in/api/?uid=1&key=12345678901234567890123456789012&setmodule=bitcoin&request=sendrawtransaction';
fetch(url, {
method: 'POST',
headers: {
'Content-Type': 'application/x-www-form-urlencoded'
},
body: "rawtx=" + rawTxHex
}).then(response => {
console.log(response)
response.text().then(resultText => {
let r = resultText.match(/<result>.*<\/result>/);
if (!r)
reject(resultText);
else {
r = r.pop().replace('<result>', '').replace('</result>', '');
if (r == '1') {
let txid = resultText.match(/<txid>.*<\/txid>/).pop().replace('<txid>', '').replace('</txid>', '');
resolve(txid);
} else if (r == '0') {
let error
if (resultText.includes('<message>')) {
error = resultText.match(/<message>.*<\/message>/).pop().replace('<message>', '').replace('</message>', '');
} else {
error = resultText.match(/<response>.*<\/response>/).pop().replace('<response>', '').replace('</response>', '');
}
reject(decodeURIComponent(error.replace(/\+/g, " ")));
} else reject(resultText);
}
}).catch(error => reject(error))
}).catch(error => reject(error))
});
Object.defineProperties(btcOperator, {
newKeys: {
get: () => {
let r = coinjs.newKeys();
r.segwitAddress = coinjs.segwitAddress(r.pubkey).address;
r.bech32Address = coinjs.bech32Address(r.pubkey).address;
return r;
}
},
pubkey: {
value: key => key.length >= 66 ? key : (key.length == 64 ? coinjs.newPubkey(key) : coinjs.wif2pubkey(key).pubkey)
},
address: {
value: (key, prefix = undefined) => coinjs.pubkey2address(btcOperator.pubkey(key), prefix)
},
segwitAddress: {
value: key => coinjs.segwitAddress(btcOperator.pubkey(key)).address
},
bech32Address: {
value: key => coinjs.bech32Address(btcOperator.pubkey(key)).address
},
bech32mAddress: {
value: key => segwit_addr.encode("bc", 1, key)
}
});
coinjs.compressed = true;
const verifyKey = btcOperator.verifyKey = function (addr, key) {
if (!addr || !key)
return undefined;
switch (coinjs.addressDecode(addr).type) {
case "standard":
return btcOperator.address(key) === addr;
case "multisig":
return btcOperator.segwitAddress(key) === addr;
case "bech32":
return btcOperator.bech32Address(key) === addr;
case "bech32m":
return btcOperator.bech32mAddress(key) === addr; // Key is a byte array of 32 bytes
default:
return null;
}
}
const validateAddress = btcOperator.validateAddress = function (addr) {
if (!addr)
return undefined;
let type = coinjs.addressDecode(addr).type;
if (["standard", "multisig", "bech32", "multisigBech32", "bech32m"].includes(type))
return type;
else
return false;
}
btcOperator.multiSigAddress = function (pubKeys, minRequired, bech32 = true) {
if (!Array.isArray(pubKeys))
throw "pubKeys must be an array of public keys";
else if (pubKeys.length < minRequired)
throw "minimum required should be less than the number of pubKeys";
if (bech32)
return coinjs.pubkeys2MultisigAddressBech32(pubKeys, minRequired);
else
return coinjs.pubkeys2MultisigAddress(pubKeys, minRequired);
}
btcOperator.decodeRedeemScript = function (redeemScript, bech32 = true) {
let script = coinjs.script();
let decoded = (bech32) ?
script.decodeRedeemScriptBech32(redeemScript) :
script.decodeRedeemScript(redeemScript);
if (!decoded)
return null;
return {
address: decoded.address,
pubKeys: decoded.pubkeys,
redeemScript: decoded.redeemscript,
required: decoded.signaturesRequired
}
}
//convert from one blockchain to another blockchain (target version)
btcOperator.convert = {};
btcOperator.convert.wif = function (source_wif, target_version = coinjs.priv) {
let keyHex = util.decodeLegacy(source_wif).hex;
if (!keyHex || keyHex.length < 66 || !/01$/.test(keyHex))
return null;
else
return util.encodeLegacy(keyHex, target_version);
}
btcOperator.convert.legacy2legacy = function (source_addr, target_version = coinjs.pub) {
let rawHex = util.decodeLegacy(source_addr).hex;
if (!rawHex)
return null;
else
return util.encodeLegacy(rawHex, target_version);
}
btcOperator.convert.legacy2bech = function (source_addr, target_version = coinjs.bech32.version, target_hrp = coinjs.bech32.hrp) {
let rawHex = util.decodeLegacy(source_addr).hex;
if (!rawHex)
return null;
else
return util.encodeBech32(rawHex, target_version, target_hrp);
}
btcOperator.convert.bech2bech = function (source_addr, target_version = coinjs.bech32.version, target_hrp = coinjs.bech32.hrp) {
let rawHex = util.decodeBech32(source_addr).hex;
if (!rawHex)
return null;
else
return util.encodeBech32(rawHex, target_version, target_hrp);
}
btcOperator.convert.bech2legacy = function (source_addr, target_version = coinjs.pub) {
let rawHex = util.decodeBech32(source_addr).hex;
if (!rawHex)
return null;
else
return util.encodeLegacy(rawHex, target_version);
}
btcOperator.convert.multisig2multisig = function (source_addr, target_version = coinjs.multisig) {
let rawHex = util.decodeLegacy(source_addr).hex;
if (!rawHex)
return null;
else
return util.encodeLegacy(rawHex, target_version);
}
btcOperator.convert.bech2multisig = function (source_addr, target_version = coinjs.multisig) {
let rawHex = util.decodeBech32(source_addr).hex;
if (!rawHex)
return null;
else {
rawHex = Crypto.util.bytesToHex(ripemd160(Crypto.util.hexToBytes(rawHex), { asBytes: true }));
return util.encodeLegacy(rawHex, target_version);
}
}
util.decodeLegacy = function (source) {
var decode = coinjs.base58decode(source);
var raw = decode.slice(0, decode.length - 4),
checksum = decode.slice(decode.length - 4);
var hash = Crypto.SHA256(Crypto.SHA256(raw, {
asBytes: true
}), {
asBytes: true
});
if (hash[0] != checksum[0] || hash[1] != checksum[1] || hash[2] != checksum[2] || hash[3] != checksum[3])
return false;
let version = raw.shift();
return {
version: version,
hex: Crypto.util.bytesToHex(raw)
}
}
util.encodeLegacy = function (hex, version) {
var bytes = Crypto.util.hexToBytes(hex);
bytes.unshift(version);
var hash = Crypto.SHA256(Crypto.SHA256(bytes, {
asBytes: true
}), {
asBytes: true
});
var checksum = hash.slice(0, 4);
return coinjs.base58encode(bytes.concat(checksum));
}
util.decodeBech32 = function (source) {
let decode = coinjs.bech32_decode(source);
if (!decode)
return false;
var raw = decode.data;
let version = raw.shift();
raw = coinjs.bech32_convert(raw, 5, 8, false);
return {
hrp: decode.hrp,
version: version,
hex: Crypto.util.bytesToHex(raw)
}
}
util.encodeBech32 = function (hex, version, hrp) {
var bytes = Crypto.util.hexToBytes(hex);
bytes = coinjs.bech32_convert(bytes, 8, 5, true);
bytes.unshift(version)
return coinjs.bech32_encode(hrp, bytes);
}
//BTC blockchain APIs
btcOperator.getBalance = addr => new Promise((resolve, reject) => {
if (!validateAddress(addr))
return reject("Invalid address");
multiApi('balance', { addr })
.then(result => resolve(result))
.catch(error => reject(error))
});
const BASE_TX_SIZE = 12,
BASE_INPUT_SIZE = 41,
LEGACY_INPUT_SIZE = 107,
BECH32_INPUT_SIZE = 27,
BECH32_MULTISIG_INPUT_SIZE = 35,
SEGWIT_INPUT_SIZE = 59,
MULTISIG_INPUT_SIZE_ES = 351,
BASE_OUTPUT_SIZE = 9,
LEGACY_OUTPUT_SIZE = 25,
BECH32_OUTPUT_SIZE = 23,
BECH32_MULTISIG_OUTPUT_SIZE = 34,
SEGWIT_OUTPUT_SIZE = 23;
BECH32M_OUTPUT_SIZE = 35; // Check this later
function _redeemScript(addr, key) {
let decode = coinjs.addressDecode(addr);
switch (decode.type) {
case "standard":
return false;
case "multisig":
return key ? coinjs.segwitAddress(btcOperator.pubkey(key)).redeemscript : null;
case "bech32":
return decode.redeemscript;
case "'multisigBech32":
return decode.redeemscript; //Multisig-edit-fee-change1
case "bech32m":
return decode.outstring; //Maybe the redeemscript will come when input processing happens for bech32m
default:
return null;
}
}
btcOperator._redeemScript = _redeemScript;
function _sizePerInput(addr, rs) {
switch (coinjs.addressDecode(addr).type) {
case "standard":
return BASE_INPUT_SIZE + LEGACY_INPUT_SIZE;
case "bech32":
return BASE_INPUT_SIZE + BECH32_INPUT_SIZE;
case "multisigBech32":
return BASE_INPUT_SIZE + BECH32_MULTISIG_INPUT_SIZE;
case "multisig":
switch (coinjs.script().decodeRedeemScript(rs).type) {
case "segwit__":
return BASE_INPUT_SIZE + SEGWIT_INPUT_SIZE;
case "multisig__":
return BASE_INPUT_SIZE + MULTISIG_INPUT_SIZE_ES;
default:
return null;
};
default:
return null;
}
}
function _sizePerOutput(addr) {
switch (coinjs.addressDecode(addr).type) {
case "standard":
return BASE_OUTPUT_SIZE + LEGACY_OUTPUT_SIZE;
case "bech32":
return BASE_OUTPUT_SIZE + BECH32_OUTPUT_SIZE;
case "multisigBech32":
return BASE_OUTPUT_SIZE + BECH32_MULTISIG_OUTPUT_SIZE;
case "multisig":
return BASE_OUTPUT_SIZE + SEGWIT_OUTPUT_SIZE;
case "bech32m":
return BASE_OUTPUT_SIZE + BECH32M_OUTPUT_SIZE;
default:
return null;
}
}
function validateTxParameters(parameters) {
let invalids = [];
//sender-ids
if (parameters.senders) {
if (!Array.isArray(parameters.senders))
parameters.senders = [parameters.senders];
parameters.senders.forEach(id => !validateAddress(id) ? invalids.push(id) : null);
if (invalids.length)
throw "Invalid senders:" + invalids;
}
if (parameters.privkeys) {
if (!Array.isArray(parameters.privkeys))
parameters.privkeys = [parameters.privkeys];
if (parameters.senders.length != parameters.privkeys.length)
throw "Array length for senders and privkeys should be equal";
parameters.senders.forEach((id, i) => {
let key = parameters.privkeys[i];
if (!verifyKey(id, key)) //verify private-key
invalids.push(id);
if (key.length === 64) //convert Hex to WIF if needed
parameters.privkeys[i] = coinjs.privkey2wif(key);
});
if (invalids.length)
throw "Invalid private key for address:" + invalids;
}
//receiver-ids (and change-id)
if (!Array.isArray(parameters.receivers))
parameters.receivers = [parameters.receivers];
parameters.receivers.forEach(id => !validateAddress(id) ? invalids.push(id) : null);
if (invalids.length)
throw "Invalid receivers:" + invalids;
if (parameters.change_address && !validateAddress(parameters.change_address))
throw "Invalid change_address:" + parameters.change_address;
//fee and amounts
if ((typeof parameters.fee !== "number" || parameters.fee <= 0) && parameters.fee !== null) //fee = null (auto calc)
throw "Invalid fee:" + parameters.fee;
if (!Array.isArray(parameters.amounts))
parameters.amounts = [parameters.amounts];
if (parameters.receivers.length != parameters.amounts.length)
throw "Array length for receivers and amounts should be equal";
parameters.amounts.forEach(a => typeof a !== "number" || a <= 0 ? invalids.push(a) : null);
if (invalids.length)
throw "Invalid amounts:" + invalids;
//return
return parameters;
}
btcOperator.validateTxParameters = validateTxParameters;
const createTransaction = btcOperator.createTransaction = ({
senders, redeemScripts, receivers, amounts, fee, change_address,
fee_from_receiver, allowUnconfirmedUtxos = false, sendingTx = false,
hasInsufficientBalance = false
}) => {
return new Promise((resolve, reject) => {
let total_amount = parseFloat(amounts.reduce((t, a) => t + a, 0).toFixed(8));
const tx = coinjs.transaction();
let output_size = addOutputs(tx, receivers, amounts, change_address);
addInputs(tx, senders, redeemScripts, total_amount, fee, output_size, fee_from_receiver, allowUnconfirmedUtxos).then(result => {
if (result.change_amount > 0 && result.change_amount > result.fee) //add change amount if any (ignore dust change)
tx.outs[tx.outs.length - 1].value = util.BTC_to_Sat(result.change_amount); //values are in satoshi
if (fee_from_receiver) { //deduce fee from receivers if fee_from_receiver
let fee_remaining = util.BTC_to_Sat(result.fee);
for (let i = 0; i < tx.outs.length - 1 && fee_remaining > 0; i++) {
if (fee_remaining < tx.outs[i].value) {
tx.outs[i].value -= fee_remaining;
fee_remaining = 0;
} else {
fee_remaining -= tx.outs[i].value;
tx.outs[i].value = 0;
}
}
if (fee_remaining > 0)
return reject("Send amount is less than fee");
}
//remove all output with value less than DUST amount
let filtered_outputs = [], dust_value = 0;
tx.outs.forEach(o => o.value >= DUST_AMT ? filtered_outputs.push(o) : dust_value += o.value);
tx.outs = filtered_outputs;
//update result values
result.fee += util.Sat_to_BTC(dust_value);
result.output_size = output_size;
result.output_amount = total_amount - (fee_from_receiver ? result.fee : 0);
result.total_size = BASE_TX_SIZE + output_size + result.input_size;
result.transaction = tx;
if (sendingTx && result.hasOwnProperty('hasInsufficientBalance') && result.hasInsufficientBalance)
reject({
message: "Insufficient balance",
...result
});
else
resolve(result);
}).catch(error => reject(error))
})
}
function addInputs(tx, senders, redeemScripts, total_amount, fee, output_size, fee_from_receiver, allowUnconfirmedUtxos = false) {
return new Promise((resolve, reject) => {
if (fee !== null) {
addUTXOs(tx, senders, redeemScripts, fee_from_receiver ? total_amount : total_amount + fee, false, { allowUnconfirmedUtxos }).then(result => {
result.fee = fee;
resolve(result);
}).catch(error => reject(error))
} else {
get_fee_rate().then(fee_rate => {
let net_fee = BASE_TX_SIZE * fee_rate;
net_fee += (output_size * fee_rate);
(fee_from_receiver ?
addUTXOs(tx, senders, redeemScripts, total_amount, false, { allowUnconfirmedUtxos }) :
addUTXOs(tx, senders, redeemScripts, total_amount + net_fee, fee_rate, { allowUnconfirmedUtxos })
).then(result => {
result.fee = parseFloat((net_fee + (result.input_size * fee_rate)).toFixed(8));
result.fee_rate = fee_rate;
resolve(result);
}).catch(error => reject(error))
}).catch(error => reject(error))
}
})
}
btcOperator.addInputs = addInputs;
function addUTXOs(tx, senders, redeemScripts, required_amount, fee_rate, rec_args = { allowUnconfirmedUtxos: false }) {
return new Promise((resolve, reject) => {
required_amount = parseFloat(required_amount.toFixed(8));
if (typeof rec_args.n === "undefined") {
rec_args.n = 0;
rec_args.input_size = 0;
rec_args.input_amount = 0;
}
if (required_amount <= 0)
return resolve({
input_size: rec_args.input_size,
input_amount: rec_args.input_amount,
change_amount: required_amount * -1 //required_amount will be -ve of change_amount
});
else if (rec_args.n >= senders.length) {
return resolve({
hasInsufficientBalance: true,
input_size: rec_args.input_size,
input_amount: rec_args.input_amount,
change_amount: required_amount * -1
});
}
let addr = senders[rec_args.n],
rs = redeemScripts[rec_args.n];
let addr_type = coinjs.addressDecode(addr).type;
let size_per_input = _sizePerInput(addr, rs);
multiApi('unspent', { addr, allowUnconfirmedUtxos: rec_args.allowUnconfirmedUtxos }).then(utxos => {
//console.debug("add-utxo", addr, rs, required_amount, utxos);
for (let i = 0; i < utxos.length && required_amount > 0; i++) {
if (utxos.length === 1 && rec_args.allowUnconfirmedUtxos) {
console.log('allowing unconfirmed utxos')
} else if (!utxos[i].confirmations) //ignore unconfirmed utxo
continue;
var script;
if (!rs || !rs.length) //legacy script
script = utxos[i].script;
else if (((rs.match(/^00/) && rs.length == 44)) || (rs.length == 40 && rs.match(/^[a-f0-9]+$/gi)) || addr_type === 'multisigBech32') {
//redeemScript for segwit/bech32 and multisig (bech32)
let s = coinjs.script();
s.writeBytes(Crypto.util.hexToBytes(rs));
s.writeOp(0);
s.writeBytes(coinjs.numToBytes(utxos[i].value.toFixed(0), 8));
script = Crypto.util.bytesToHex(s.buffer);
} else //redeemScript for multisig (segwit)
script = rs;
tx.addinput(utxos[i].tx_hash_big_endian, utxos[i].tx_output_n, script, 0xfffffffd /*sequence*/); //0xfffffffd for Replace-by-fee
//update track values
rec_args.input_size += size_per_input;
rec_args.input_amount += util.Sat_to_BTC(utxos[i].value);
required_amount -= util.Sat_to_BTC(utxos[i].value);
if (fee_rate) //automatic fee calculation (dynamic)
required_amount += size_per_input * fee_rate;
}
rec_args.n += 1;
addUTXOs(tx, senders, redeemScripts, required_amount, fee_rate, rec_args)
.then(result => resolve(result))
.catch(error => reject(error))
}).catch(error => reject(error))
})
}
btcOperator.addUTXOs = addUTXOs;
function addOutputs(tx, receivers, amounts, change_address) {
let size = 0;
for (let i in receivers) {
tx.addoutput(receivers[i], amounts[i]);
size += _sizePerOutput(receivers[i]);
}
tx.addoutput(change_address, 0);
size += _sizePerOutput(change_address);
return size;
}
btcOperator.addOutputs = addOutputs;
function tx_fetch_for_editing(tx) {
return new Promise((resolve, reject) => {
if (typeof tx == 'string' && /^[0-9a-f]{64}$/i.test(tx)) { //tx is txid
getTx.hex(tx)
.then(txhex => resolve(deserializeTx(txhex)))
.catch(error => reject(error))
} else resolve(deserializeTx(tx));
})
}
btcOperator.tx_fetch_for_editing = tx_fetch_for_editing;
const extractLastHexStrings = btcOperator.extractLastHexStrings = function (arr) {
const result = [];
for (let i = 0; i < arr.length; i++) {
const innerArray = arr[i];
if (innerArray.length > 0) {
const lastHexString = innerArray[innerArray.length - 1];
result.push(lastHexString);
}
}
return result;
}
btcOperator.editFee = function (tx_hex, new_fee, private_keys, change_only = true) {
return new Promise((resolve, reject) => {
if (!Array.isArray(private_keys))
private_keys = [private_keys];
tx_fetch_for_editing(tx_hex).then(tx => {
parseTransaction(tx).then(tx_parsed => {
if (tx_parsed.fee >= new_fee)
return reject("Fees can only be increased");
//editable addresses in output values (for fee increase)