viem
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JavaScript
import { InvalidAddressError } from '../../errors/address.js';
import { stringToBytes, } from '../encoding/toBytes.js';
import { keccak256 } from '../hash/keccak256.js';
import { LruMap } from '../lru.js';
import { isAddress } from './isAddress.js';
const checksumAddressCache = /*#__PURE__*/ new LruMap(8192);
export function checksumAddress(address_,
/**
* Warning: EIP-1191 checksum addresses are generally not backwards compatible with the
* wider Ethereum ecosystem, meaning it will break when validated against an application/tool
* that relies on EIP-55 checksum encoding (checksum without chainId).
*
* It is highly recommended to not use this feature unless you
* know what you are doing.
*
* See more: https://github.com/ethereum/EIPs/issues/1121
*/
chainId) {
if (checksumAddressCache.has(`${address_}.${chainId}`))
return checksumAddressCache.get(`${address_}.${chainId}`);
const hexAddress = chainId
? `${chainId}${address_.toLowerCase()}`
: address_.substring(2).toLowerCase();
const hash = keccak256(stringToBytes(hexAddress), 'bytes');
const address = (chainId ? hexAddress.substring(`${chainId}0x`.length) : hexAddress).split('');
for (let i = 0; i < 40; i += 2) {
if (hash[i >> 1] >> 4 >= 8 && address[i]) {
address[i] = address[i].toUpperCase();
}
if ((hash[i >> 1] & 0x0f) >= 8 && address[i + 1]) {
address[i + 1] = address[i + 1].toUpperCase();
}
}
const result = `0x${address.join('')}`;
checksumAddressCache.set(`${address_}.${chainId}`, result);
return result;
}
export function getAddress(address,
/**
* Warning: EIP-1191 checksum addresses are generally not backwards compatible with the
* wider Ethereum ecosystem, meaning it will break when validated against an application/tool
* that relies on EIP-55 checksum encoding (checksum without chainId).
*
* It is highly recommended to not use this feature unless you
* know what you are doing.
*
* See more: https://github.com/ethereum/EIPs/issues/1121
*/
chainId) {
if (!isAddress(address, { strict: false }))
throw new InvalidAddressError({ address });
return checksumAddress(address, chainId);
}
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