@faast/ethereum-payments/dist/lib/erc20/deriveAddress.js

Library to assist in processing ethereum payments, such as deriving addresses and sweeping funds

const Web3 = require('web3');
const web3 = new Web3({});
import { TOKEN_PROXY_DATA } from '../constants';
export function deriveAddress(creatorAddress, salt, hashed = false) {
    const address = creatorAddress.replace(/0x/, '').toLowerCase();
    const proxy = web3.utils.sha3(TOKEN_PROXY_DATA.replace(/<address to proxy>/g, address))
        .replace(/0x/, '').toLowerCase();
    let saltHash = (hashed ? salt : web3.utils.sha3(`0x${salt}`)).replace(/0x/, '').toLowerCase();
    while (saltHash.length < 64) {
        saltHash = `0${saltHash}`;
    }
    return `0x${web3.utils.sha3(`0xff${address}${saltHash}${proxy}`).slice(-40)}`.toLowerCase();
}
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