send-crypto
Version:
A minimal JavaScript library / wallet for sending crypto assets
124 lines • 15.8 kB
JavaScript
import BigNumber from "bignumber.js";
import * as bitcoin from "bitgo-utxo-lib";
import { List } from "immutable";
import { Blockchain, BlockchainNetwork } from "../../common/apis/blockchain";
import { Blockchair } from "../../common/apis/blockchair";
import { Blockstream } from "../../common/apis/blockstream";
import { ElectrumX } from "../../common/apis/electrumx";
import { JSONRPC, MULTICHAIN_URLS } from "../../common/apis/jsonrpc";
import { Sochain } from "../../common/apis/sochain";
import { BitgoUTXOLib } from "../../common/libraries/bitgoUtxoLib";
import { subscribeToConfirmations } from "../../lib/confirmations";
import { newPromiEvent } from "../../lib/promiEvent";
import { fallback, retryNTimes } from "../../lib/retry";
import { shuffleArray } from "../../lib/utils";
export const _apiFallbacks = {
fetchUTXO: (testnet, txHash, vOut) => [
...shuffleArray(() => Blockstream.fetchUTXO(testnet)(txHash, vOut), () => Blockchair.fetchUTXO(testnet
? Blockchair.networks.BITCOIN_TESTNET
: Blockchair.networks.BITCOIN)(txHash, vOut)),
() => Blockchain.fetchUTXO(testnet
? BlockchainNetwork.BitcoinTestnet
: BlockchainNetwork.Bitcoin)(txHash, vOut),
],
fetchUTXOs: (testnet, address, confirmations, scriptHash) => [
...shuffleArray(() => Blockstream.fetchUTXOs(testnet)(address, confirmations), () => Blockchair.fetchUTXOs(testnet
? Blockchair.networks.BITCOIN_TESTNET
: Blockchair.networks.BITCOIN)(address, confirmations)),
() => Sochain.fetchUTXOs(testnet ? "BTCTEST" : "BTC")(address, confirmations),
() => Blockchain.fetchUTXOs(testnet
? BlockchainNetwork.BitcoinTestnet
: BlockchainNetwork.Bitcoin)(address, confirmations),
() => ElectrumX.fetchUTXOs("bitcoin", testnet)(address, confirmations, scriptHash),
],
fetchTXs: (testnet, address, confirmations = 0, scriptHash) => [
...shuffleArray(() => Blockstream.fetchTXs(testnet)(address), () => Blockchair.fetchTXs(testnet
? Blockchair.networks.BITCOIN_TESTNET
: Blockchair.networks.BITCOIN)(address, confirmations), () => Sochain.fetchTXs(testnet ? "BTCTEST" : "BTC")(address, confirmations), () => Blockchain.fetchUTXOs(testnet
? BlockchainNetwork.BitcoinTestnet
: BlockchainNetwork.Bitcoin)(address, confirmations)),
],
broadcastTransaction: (testnet, hex) => [
...shuffleArray(() => Blockstream.broadcastTransaction(testnet)(hex), () => Blockchair.broadcastTransaction(testnet
? Blockchair.networks.BITCOIN_TESTNET
: Blockchair.networks.BITCOIN)(hex)),
() => Sochain.broadcastTransaction(testnet ? "BTCTEST" : "BTC")(hex),
() => JSONRPC.broadcastTransaction(testnet ? MULTICHAIN_URLS.BTCTEST : MULTICHAIN_URLS.BTC)(hex),
testnet
? undefined
: () => Blockchain.broadcastTransaction(BlockchainNetwork.Bitcoin)(hex),
],
};
export class BTCHandler {
privateKey;
testnet;
decimals = 8;
static getUTXOs = async (testnet, options) => {
const confirmations = options && options.confirmations !== undefined
? options.confirmations
: 0;
const endpoints = _apiFallbacks.fetchUTXOs(testnet, options.address, confirmations, options.scriptHash);
return fallback(endpoints);
};
static getUTXO = async (testnet, txHash, vOut) => {
const endpoints = _apiFallbacks.fetchUTXO(testnet, txHash, vOut);
return fallback(endpoints);
};
static getTransactions = async (testnet, options) => {
const confirmations = options && options.confirmations !== undefined
? options.confirmations
: 0;
const endpoints = _apiFallbacks.fetchTXs(testnet, options.address, confirmations, options.scriptHash);
return fallback(endpoints);
};
constructor(privateKey, network) {
this.testnet = network !== "mainnet";
this.privateKey = BitgoUTXOLib.loadPrivateKey(this.testnet ? bitcoin.networks.testnet : bitcoin.networks.bitcoin, privateKey);
}
// Returns whether or not this can handle the asset
handlesAsset = (asset) => typeof asset === "string" &&
["BTC", "BITCOIN"].indexOf(asset.toUpperCase()) !== -1;
address = async (asset, options) => this.privateKey.getAddress();
// Balance
getBalance = async (asset, options) => (await this.getBalanceInSats(asset, options)).dividedBy(new BigNumber(10).exponentiatedBy(this.decimals));
getBalanceInSats = async (asset, options) => {
const utxos = await BTCHandler.getUTXOs(this.testnet, {
...options,
address: (options && options.address) || (await this.address(asset)),
});
return utxos.reduce((sum, utxo) => sum.plus(utxo.amount), new BigNumber(0));
};
// Transfer
send = (to, value, asset, options) => this.sendSats(to, value.times(new BigNumber(10).exponentiatedBy(this.decimals)), asset, options);
sendSats = (to, valueIn, asset, options) => {
const promiEvent = newPromiEvent();
let txHash;
let errored;
(async () => {
const fromAddress = await this.address(asset);
const changeAddress = fromAddress;
const utxos = List(await BTCHandler.getUTXOs(this.testnet, {
...options,
address: fromAddress,
}))
.sortBy((utxo) => utxo.amount)
.reverse()
.toArray();
const built = await BitgoUTXOLib.buildUTXO(this.testnet
? bitcoin.networks.testnet
: bitcoin.networks.bitcoin, this.privateKey, changeAddress, to, valueIn, utxos, options);
txHash = await retryNTimes(() => fallback(_apiFallbacks.broadcastTransaction(this.testnet, built.toHex())), 3);
promiEvent.emit("transactionHash", txHash);
promiEvent.resolve(txHash);
})().catch((error) => {
errored = true;
promiEvent.reject(error);
});
subscribeToConfirmations(promiEvent, () => errored, async () => (txHash ? this._getConfirmations(txHash) : 0));
return promiEvent;
};
_getConfirmations = async (txHash) => (await fallback(
// Fetch confirmations for first output of transaction.
_apiFallbacks.fetchUTXO(this.testnet, txHash, 0))).confirmations;
}
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