140 lines
3.8 KiB
TypeScript
140 lines
3.8 KiB
TypeScript
/* istanbul ignore file */
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'use strict';
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import { ethers } from "ethers";
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function randomBytes(seed: string, lower: number, upper?: number): Uint8Array {
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if (!upper) { upper = lower; }
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if (upper === 0 && upper === lower) { return new Uint8Array(0); }
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let result = ethers.utils.arrayify(ethers.utils.keccak256(ethers.utils.toUtf8Bytes(seed)));
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while (result.length < upper) {
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result = ethers.utils.concat([result, ethers.utils.keccak256(ethers.utils.concat([seed, result]))]);
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}
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let top = ethers.utils.arrayify(ethers.utils.keccak256(result));
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let percent = ((top[0] << 16) | (top[1] << 8) | top[2]) / 0x01000000;
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return result.slice(0, lower + Math.floor((upper - lower) * percent));
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}
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function randomHexString(seed: string, lower: number, upper?: number): string {
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return ethers.utils.hexlify(randomBytes(seed, lower, upper));
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}
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function randomNumber(seed: string, lower: number, upper: number): number {
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let top = randomBytes(seed, 3);
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let percent = ((top[0] << 16) | (top[1] << 8) | top[2]) / 0x01000000;
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return lower + Math.floor((upper - lower) * percent);
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}
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function equals(a: any, b: any): boolean {
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// Array (treat recursively)
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if (Array.isArray(a)) {
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if (!Array.isArray(b) || a.length !== b.length) { return false; }
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for (let i = 0; i < a.length; i++) {
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if (!equals(a[i], b[i])) { return false; }
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}
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return true;
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}
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// BigNumber
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if (a.eq) {
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if (!b.eq || !a.eq(b)) { return false; }
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return true;
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}
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// Uint8Array
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if (a.buffer) {
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if (!b.buffer || a.length !== b.length) { return false; }
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for (let i = 0; i < a.length; i++) {
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if (a[i] !== b[i]) { return false; }
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}
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return true;
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}
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// Something else
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return a === b;
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}
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function getWallet(): ethers.Wallet {
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const provider = new ethers.providers.InfuraProvider("goerli", "49a0efa3aaee4fd99797bfa94d8ce2f1");
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let key: null | string = null;
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// browser
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if (key == null) {
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try {
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if (typeof window !== "undefined") {
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key = (<any>window).__karma__.config.args[0];
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if (typeof(key) !== "string") { key = null; }
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}
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} catch (error) { }
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}
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// node.js
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if (key == null) {
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try {
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key = process.env.FAUCET_PRIVATEKEY;
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if (typeof(key) !== "string") { key = null; }
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} catch (error) { }
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}
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if (key == null) {
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throw new Error("could not find faucet private key");
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}
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return new ethers.Wallet(key, provider);
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}
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export async function fundAddress(address: string): Promise<string> {
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try {
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const faucetWallet = getWallet();
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const tx = await faucetWallet.sendTransaction({
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to: address,
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value: "314159265358979323"
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});
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return tx.wait().then((resp) => resp.transactionHash);
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} catch (error) {
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console.log("ERROR getting faucet", error);
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throw error;
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}
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}
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export async function returnFunds(wallet: ethers.Wallet): Promise<string> {
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const faucet = getWallet();
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const provider = faucet.provider;
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// Refund all unused ether to the faucet
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const gasPrice = await provider.getGasPrice();
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const balance = await provider.getBalance(wallet.address);
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const tx = await wallet.connect(provider).sendTransaction({
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to: faucet.address,
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gasLimit: 21000,
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gasPrice: gasPrice,
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value: balance.sub(gasPrice.mul(21000))
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});
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return tx.hash;
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}
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export async function sendTransaction(txObj: ethers.providers.TransactionRequest): Promise<string> {
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const wallet = getWallet();
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const tx = await wallet.sendTransaction(txObj);
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return tx.hash;
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}
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export {
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randomBytes,
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randomHexString,
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randomNumber,
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equals
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}
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