viem/_esm/utils/address/getAddress.js

TypeScript Interface for Ethereum

import { InvalidAddressError } from '../../errors/address.js';
import { stringToBytes, } from '../encoding/toBytes.js';
import { keccak256 } from '../hash/keccak256.js';
import { isAddress } from './isAddress.js';
export function checksumAddress(address_, chainId) {
    const hexAddress = chainId
        ? `${chainId}${address_.toLowerCase()}`
        : address_.substring(2).toLowerCase();
    const hash = keccak256(stringToBytes(hexAddress), 'bytes');
    const address = (chainId ? hexAddress.substring(`${chainId}0x`.length) : hexAddress).split('');
    for (let i = 0; i < 40; i += 2) {
        if (hash[i >> 1] >> 4 >= 8 && address[i]) {
            address[i] = address[i].toUpperCase();
        }
        if ((hash[i >> 1] & 0x0f) >= 8 && address[i + 1]) {
            address[i + 1] = address[i + 1].toUpperCase();
        }
    }
    return `0x${address.join('')}`;
}
export function getAddress(address, chainId) {
    if (!isAddress(address))
        throw new InvalidAddressError({ address });
    return checksumAddress(address, chainId);
}
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