send-crypto
Version:
A minimal JavaScript library / wallet for sending crypto assets
146 lines • 16.5 kB
JavaScript
import { toCashAddress, toLegacyAddress } from "bchaddrjs";
import BigNumber from "bignumber.js";
import * as bitcoin from "bitgo-utxo-lib";
import { List } from "immutable";
import { BitcoinDotCom } from "../../common/apis/bitcoinDotCom";
import { Blockchain, BlockchainNetwork } from "../../common/apis/blockchain";
import { Blockchair } from "../../common/apis/blockchair";
import { Insight } from "../../common/apis/insight";
import { JSONRPC, MULTICHAIN_URLS } from "../../common/apis/jsonrpc";
import { BitgoUTXOLib } from "../../common/libraries/bitgoUtxoLib";
import { subscribeToConfirmations } from "../../lib/confirmations";
import { newPromiEvent } from "../../lib/promiEvent";
import { fallback, retryNTimes } from "../../lib/retry";
const testnetInsight = "https://api.bitcore.io/api/BCH/testnet/";
const mainnetInsight = "https://api.bitcore.io/api/BCH/mainnet/";
const toCashAddr = (legacyAddress) => {
try {
return toCashAddress(legacyAddress);
}
catch (error) {
return legacyAddress;
}
};
export const _apiFallbacks = {
fetchUTXO: (testnet, txHash, vOut) => [
() => Blockchain.fetchUTXO(testnet
? BlockchainNetwork.BitcoinCashTestnet
: BlockchainNetwork.BitcoinCash)(txHash, vOut),
() => Insight.fetchUTXO(testnet ? testnetInsight : mainnetInsight)(txHash, vOut),
() => BitcoinDotCom.fetchUTXO(testnet)(txHash, vOut),
testnet
? undefined
: () => Blockchair.fetchUTXO(Blockchair.networks.BITCOIN_CASH)(txHash, vOut),
],
fetchUTXOs: (testnet, address, confirmations) => [
() => Blockchain.fetchUTXOs(testnet
? BlockchainNetwork.BitcoinCashTestnet
: BlockchainNetwork.BitcoinCash)(address, confirmations),
() => Insight.fetchUTXOs(testnet ? testnetInsight : mainnetInsight)(address, confirmations),
() => BitcoinDotCom.fetchUTXOs(testnet)(address, confirmations),
testnet
? undefined
: () => Blockchair.fetchUTXOs(Blockchair.networks.BITCOIN_CASH)(address, confirmations),
],
fetchTXs: (testnet, address, confirmations = 0) => [
() => Blockchain.fetchTXs(testnet
? BlockchainNetwork.BitcoinCashTestnet
: BlockchainNetwork.BitcoinCash)(address, confirmations),
() => Insight.fetchTXs(testnet ? testnetInsight : mainnetInsight)(address, confirmations),
// () => BitcoinDotCom.fetchTXs(testnet)(address, confirmations),
testnet
? undefined
: () => Blockchair.fetchTXs(Blockchair.networks.BITCOIN_CASH)(address, confirmations),
],
broadcastTransaction: (testnet, hex) => [
() => JSONRPC.broadcastTransaction(testnet ? MULTICHAIN_URLS.BCHTEST : MULTICHAIN_URLS.BCH)(hex),
() => Insight.broadcastTransaction(testnet ? testnetInsight : mainnetInsight)(hex),
() => BitcoinDotCom.broadcastTransaction(testnet)(hex),
testnet
? undefined
: () => Blockchair.broadcastTransaction(Blockchair.networks.BITCOIN_CASH)(hex),
],
};
export class BCHHandler {
privateKey;
testnet;
decimals = 8;
static getUTXOs = async (testnet, options) => {
const address = toCashAddr(options.address);
const confirmations = options.confirmations || 0;
const endpoints = _apiFallbacks.fetchUTXOs(testnet, address, confirmations);
const utxos = await fallback(endpoints);
return utxos;
};
static getUTXO = async (testnet, txHash, vOut) => {
const endpoints = _apiFallbacks.fetchUTXO(testnet, txHash, vOut);
return fallback(endpoints);
};
static getTransactions = async (testnet, options) => {
const address = toCashAddr(options.address);
const confirmations = options && options.confirmations !== undefined
? options.confirmations
: 0;
const endpoints = _apiFallbacks.fetchTXs(testnet, address, confirmations);
return fallback(endpoints);
};
constructor(privateKey, network) {
this.testnet = network !== "mainnet";
this.privateKey = BitgoUTXOLib.loadPrivateKey(this._bitgoNetwork(), privateKey);
}
// Returns whether or not this can handle the asset
handlesAsset = (asset) => typeof asset === "string" &&
["BCH", "BITCOIN CASH", "BCASH", "BITCOINCASH", "BITCOIN-CASH"].indexOf(asset.toUpperCase()) !== -1;
address = async (asset, options) => toCashAddr(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 BCHHandler.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 = toLegacyAddress(await this.address(asset));
const toAddress = toLegacyAddress(to);
const changeAddress = fromAddress;
const utxos = List(await BCHHandler.getUTXOs(this.testnet, {
...options,
address: fromAddress,
}))
.sortBy((utxo) => utxo.amount)
.reverse()
.toArray();
const built = await BitgoUTXOLib.buildUTXO(this._bitgoNetwork(), this.privateKey, changeAddress, toAddress, valueIn, utxos, {
...options,
signFlag:
// bitcoin.Transaction.SIGHASH_ALL |
// tslint:disable-next-line: no-bitwise
bitcoin.Transaction.SIGHASH_SINGLE |
bitcoin.Transaction.SIGHASH_BITCOINCASHBIP143,
});
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;
_bitgoNetwork = () => this.testnet
? bitcoin.networks.bitcoincashTestnet
: bitcoin.networks.bitcoincash;
}
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