@polkadot/util-crypto/address/derive.js

// Copyright 2017-2022 @polkadot/util-crypto authors & contributors
// SPDX-License-Identifier: Apache-2.0
import { assert } from '@polkadot/util';
import { keyExtractPath } from "../key/index.js";
import { sr25519DerivePublic } from "../sr25519/index.js";
import { decodeAddress } from "./decode.js";
import { encodeAddress } from "./encode.js";

function filterHard({
  isHard
}) {
  return isHard;
}
/**
 * @name deriveAddress
 * @summary Creates a sr25519 derived address from the supplied and path.
 * @description
 * Creates a sr25519 derived address based on the input address/publicKey and the uri supplied.
 */


export function deriveAddress(who, suri, ss58Format) {
  const {
    path
  } = keyExtractPath(suri);
  assert(path.length && !path.every(filterHard), 'Expected suri to contain a combination of non-hard paths');
  let publicKey = decodeAddress(who);

  for (const {
    chainCode
  } of path) {
    publicKey = sr25519DerivePublic(publicKey, chainCode);
  }

  return encodeAddress(publicKey, ss58Format);
}