hardhat.config.js

require('dotenv').config();
const { utils } = require('ethers');
const fs = require('fs');
require('@nomiclabs/hardhat-waffle');
const { isAddress, getAddress, formatUnits, parseUnits } = utils;
const { network } = require('./constants');

const defaultNetwork = network;

function mnemonic() {
  try {
    return fs.readFileSync('./mnemonic.txt').toString().trim();
  } catch (e) {
    if (defaultNetwork !== 'localhost') {
      console.log(
        '☢️ WARNING: No mnemonic file created for a deploy account. Try `npm run generate` and then `npm run account`.'
      );
    }
  }
  return '';
}

module.exports = {
  defaultNetwork,
  networks: {
    localhost: {
      url: 'http://localhost:8545',
    },
    mainnet: {
      url: `https://mainnet.infura.io/v3/${process.env.INFURA_API_KEY}`,
      accounts: {
        mnemonic: mnemonic(),
      },
    },
    rinkeby: {
      url: `https://rinkeby.infura.io/v3/${process.env.INFURA_API_KEY}`,
      accounts: {
        mnemonic: mnemonic(),
      },
    },
    kovan: {
      url: `https://kovan.infura.io/v3/${process.env.INFURA_API_KEY}`,
      accounts: {
        mnemonic: mnemonic(),
      },
    },
    ropsten: {
      url: `https://ropsten.infura.io/v3/${process.env.INFURA_API_KEY}`,
      accounts: {
        mnemonic: mnemonic(),
      },
    },
  },
  solidity: {
    compilers: [
      {
        version: '0.4.26',
        settings: {
          optimizer: {
            enabled: true,
            runs: 200,
          },
        },
      },
      {
        version: '0.7.0',
        settings: {
          optimizer: {
            enabled: true,
            runs: 200,
          },
        },
      },
    ],
  },
};

const DEBUG = false;

function debug(text) {
  if (DEBUG) {
    console.log(text);
  }
}

task('wallet', 'Create a wallet (pk) link', async (_, { ethers }) => {
  const randomWallet = ethers.Wallet.createRandom();
  const privateKey = randomWallet._signingKey().privateKey;

  console.log('🔐 WALLET Generated as ' + randomWallet.address + '');
  console.log('🔗 http://localhost:3000/pk#' + privateKey);
});

task('fundedwallet', 'Create a wallet (pk) link and fund it with deployer?')
  .addOptionalParam('amount', 'Amount of ETH to send to wallet after generating')
  .addOptionalParam('url', 'URL to add pk to')
  .setAction(async (taskArgs, { network, ethers }) => {
    const randomWallet = ethers.Wallet.createRandom();
    const privateKey = randomWallet._signingKey().privateKey;

    console.log('🔐 WALLET Generated as ' + randomWallet.address + '');

    let url = taskArgs.url ? taskArgs.url : 'http://localhost:3000';

    let localDeployerMnemonic;

    try {
      localDeployerMnemonic = fs.readFileSync('./mnemonic.txt');
      localDeployerMnemonic = localDeployerMnemonic.toString().trim();
    } catch (e) {
      // do nothing - this file isn't always there
    }

    let amount = taskArgs.amount ? taskArgs.amount : '0.01';

    const tx = {
      to: randomWallet.address,
      value: ethers.utils.parseEther(amount),
    };

    // send using local deployer mnemonic if there is one, if not send using local hardhat node
    if (localDeployerMnemonic) {
      let deployerWallet = new ethers.Wallet.fromMnemonic(localDeployerMnemonic);

      deployerWallet = deployerWallet.connect(ethers.provider);

      console.log('💵 Sending ' + amount + ' ETH to ' + randomWallet.address + ' using deployer account');

      let sendresult = await deployerWallet.sendTransaction(tx);

      console.log('\n' + url + '/pk#' + privateKey + '\n');

      return;
    } else {
      console.log('💵 Sending ' + amount + ' ETH to ' + randomWallet.address + ' using local node');
      console.log('\n' + url + '/pk#' + privateKey + '\n');

      return send(ethers.provider.getSigner(), tx);
    }
  });

task('generate', 'Create a mnemonic for builder deploys', async (_, { ethers }) => {
  const bip39 = require('bip39');
  const hdkey = require('ethereumjs-wallet/hdkey');
  const mnemonic = bip39.generateMnemonic();

  if (DEBUG) console.log('mnemonic', mnemonic);

  const seed = await bip39.mnemonicToSeed(mnemonic);

  if (DEBUG) console.log('seed', seed);

  const hdwallet = hdkey.fromMasterSeed(seed);
  const wallet_hdpath = "m/44'/60'/0'/0/";
  const account_index = 0;

  let fullPath = wallet_hdpath + account_index;

  if (DEBUG) console.log('fullPath', fullPath);

  const wallet = hdwallet.derivePath(fullPath).getWallet();
  const privateKey = '0x' + wallet._privKey.toString('hex');

  if (DEBUG) console.log('privateKey', privateKey);

  var EthUtil = require('ethereumjs-util');

  const address = '0x' + EthUtil.privateToAddress(wallet._privKey).toString('hex');

  console.log('🔐 Account Generated as ' + address + ' and set as mnemonic in packages/hardhat');
  console.log("💬 Use 'npm run account' to get more information about the deployment account.");

  fs.writeFileSync('./' + address + '.txt', mnemonic.toString());
  fs.writeFileSync('./mnemonic.txt', mnemonic.toString());
});

task('account', 'Get balance informations for the deployment account.', async (_, { ethers }) => {
  const hdkey = require('ethereumjs-wallet/hdkey');
  const bip39 = require('bip39');

  let mnemonic = fs.readFileSync('./mnemonic.txt').toString().trim();

  if (DEBUG) console.log('mnemonic', mnemonic);

  const seed = await bip39.mnemonicToSeed(mnemonic);

  if (DEBUG) console.log('seed', seed);

  const hdwallet = hdkey.fromMasterSeed(seed);
  const wallet_hdpath = "m/44'/60'/0'/0/";
  const account_index = 0;

  let fullPath = wallet_hdpath + account_index;

  if (DEBUG) console.log('fullPath', fullPath);

  const wallet = hdwallet.derivePath(fullPath).getWallet();
  const privateKey = '0x' + wallet._privKey.toString('hex');

  if (DEBUG) console.log('privateKey', privateKey);

  var EthUtil = require('ethereumjs-util');

  const address = '0x' + EthUtil.privateToAddress(wallet._privKey).toString('hex');

  var qrcode = require('qrcode-terminal');

  qrcode.generate(address);

  console.log('‍📬 Deployer Account is ' + address);

  for (let n in config.networks) {
    try {
      let provider = new ethers.providers.JsonRpcProvider(config.networks[n].url);
      let balance = await provider.getBalance(address);

      console.log(' -- ' + n + ' --  -- -- 📡 ');
      console.log('   balance: ' + ethers.utils.formatEther(balance));
      console.log('   nonce: ' + (await provider.getTransactionCount(address)));
    } catch (e) {
      if (DEBUG) {
        console.log(e);
      }
    }
  }
});

async function addr(ethers, addr) {
  if (isAddress(addr)) {
    return getAddress(addr);
  }

  const accounts = await ethers.provider.listAccounts();

  if (accounts[addr] !== undefined) {
    return accounts[addr];
  }

  throw `Could not normalize address: ${addr}`;
}

task('accounts', 'Prints the list of accounts', async (_, { ethers }) => {
  const accounts = await ethers.provider.listAccounts();

  accounts.forEach((account) => console.log(account));
});

task('blockNumber', 'Prints the block number', async (_, { ethers }) => {
  const blockNumber = await ethers.provider.getBlockNumber();

  console.log(blockNumber);
});

task('balance', "Prints an account's balance")
  .addPositionalParam('account', "The account's address")
  .setAction(async (taskArgs, { ethers }) => {
    const balance = await ethers.provider.getBalance(await addr(ethers, taskArgs.account));

    console.log(formatUnits(balance, 'ether'), 'ETH');
  });

function send(signer, txparams) {
  return signer.sendTransaction(txparams, (error, transactionHash) => {
    if (error) {
      debug(`Error: ${error}`);
    }

    debug(`transactionHash: ${transactionHash}`);
  });
}

task('send', 'Send ETH')
  .addParam('from', 'From address or account index')
  .addOptionalParam('to', 'To address or account index')
  .addOptionalParam('amount', 'Amount to send in ether')
  .addOptionalParam('data', 'Data included in transaction')
  .addOptionalParam('gasPrice', 'Price you are willing to pay in gwei')
  .addOptionalParam('gasLimit', 'Limit of how much gas to spend')

  .setAction(async (taskArgs, { network, ethers }) => {
    const from = await addr(ethers, taskArgs.from);

    debug(`Normalized from address: ${from}`);

    const fromSigner = await ethers.provider.getSigner(from);

    let to;

    if (taskArgs.to) {
      to = await addr(ethers, taskArgs.to);

      debug(`Normalized to address: ${to}`);
    }

    const txRequest = {
      from: await fromSigner.getAddress(),
      to,
      value: parseUnits(taskArgs.amount ? taskArgs.amount : '0', 'ether').toHexString(),
      nonce: await fromSigner.getTransactionCount(),
      gasPrice: parseUnits(taskArgs.gasPrice ? taskArgs.gasPrice : '1.001', 'gwei').toHexString(),
      gasLimit: taskArgs.gasLimit ? taskArgs.gasLimit : 24000,
      chainId: network.config.chainId,
    };

    if (taskArgs.data !== undefined) {
      txRequest.data = taskArgs.data;

      debug(`Adding data to payload: ${txRequest.data}`);
    }

    debug(txRequest.gasPrice / 1000000000 + ' gwei');
    debug(JSON.stringify(txRequest, null, 2));

    return send(fromSigner, txRequest);
  });