@lodestar/types/lib/utils/executionAddress.js

Typescript types required for lodestar

import { ByteVectorType } from "@chainsafe/ssz";
import { keccak256 } from "ethereum-cryptography/keccak.js";
export class ExecutionAddressType extends ByteVectorType {
    constructor() {
        super(20, { typeName: "ExecutionAddress" });
    }
    toJson(value) {
        const str = super.toJson(value);
        return toChecksumAddress(str);
    }
}
function isAddressValid(address) {
    return /^(0x)?[0-9a-f]{40}$/i.test(address);
}
/**
 * Formats an address according to [ERC55](https://eips.ethereum.org/EIPS/eip-55)
 */
export function toChecksumAddress(address) {
    if (!isAddressValid(address)) {
        throw Error(`Invalid address: ${address}`);
    }
    const rawAddress = (address.startsWith("0x") ? address.slice(2) : address).toLowerCase();
    const chars = rawAddress.split("");
    // Inspired by https://github.com/ethers-io/ethers.js/blob/cac1da1f912c2ae9ba20f25aa51a91766673cd76/src.ts/address/address.ts#L8
    const expanded = new Uint8Array(chars.length);
    for (let i = 0; i < expanded.length; i++) {
        expanded[i] = rawAddress[i].charCodeAt(0);
    }
    const hashed = keccak256(expanded);
    for (let i = 0; i < chars.length; i += 2) {
        if (hashed[i >> 1] >> 4 >= 8) {
            chars[i] = chars[i].toUpperCase();
        }
        if ((hashed[i >> 1] & 0x0f) >= 8) {
            chars[i + 1] = chars[i + 1].toUpperCase();
        }
    }
    return "0x" + chars.join("");
}
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