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import ethUtil = require('ethereumjs-util');
import HDNode = require('hdkey');
import * as _ from 'lodash';
import { DerivedHDKey, WalletSubproviderErrors } from '../types';
const DEFAULT_ADDRESS_SEARCH_OFFSET = 0;
const BATCH_SIZE = 10;
export const walletUtils = {
DEFAULT_NUM_ADDRESSES_TO_FETCH: 10,
DEFAULT_ADDRESS_SEARCH_LIMIT: 1000,
calculateDerivedHDKeys(
initialDerivedKey: DerivedHDKey,
searchLimit: number,
offset: number = DEFAULT_ADDRESS_SEARCH_OFFSET,
): DerivedHDKey[] {
const derivedKeys: DerivedHDKey[] = [];
_.times(searchLimit, i => {
const derivationPath = initialDerivedKey.derivationPath;
const derivationIndex = offset + i;
// If the DerivedHDKey is a child then we walk relative, if not we walk the full derivation path
const path = initialDerivedKey.isChildKey
? `m/${derivationIndex}`
: `m/${derivationPath}/${derivationIndex}`;
const hdKey = initialDerivedKey.hdKey.derive(path);
const address = walletUtils.addressOfHDKey(hdKey);
const derivedKey: DerivedHDKey = {
address,
hdKey,
derivationPath,
derivationIndex,
isChildKey: initialDerivedKey.isChildKey,
};
derivedKeys.push(derivedKey);
});
return derivedKeys;
},
addressOfHDKey(hdKey: HDNode): string {
const shouldSanitizePublicKey = true;
const derivedPublicKey = hdKey.publicKey;
const ethereumAddressUnprefixed = ethUtil
.publicToAddress(derivedPublicKey, shouldSanitizePublicKey)
.toString('hex');
const address = ethUtil.addHexPrefix(ethereumAddressUnprefixed);
return address;
},
findDerivedKeyByAddress(
address: string,
initialDerivedKey: DerivedHDKey,
searchLimit: number,
): DerivedHDKey | undefined {
let matchedKey: DerivedHDKey | undefined;
for (let index = 0; index < searchLimit; index = index + BATCH_SIZE) {
const derivedKeys = walletUtils.calculateDerivedHDKeys(initialDerivedKey, BATCH_SIZE, index);
matchedKey = _.find(derivedKeys, derivedKey => derivedKey.address === address);
if (matchedKey) {
break;
}
}
return matchedKey;
},
_firstDerivedKey(initialDerivedKey: DerivedHDKey): DerivedHDKey {
const derivedKeys = walletUtils.calculateDerivedHDKeys(initialDerivedKey, 1, 0);
const firstDerivedKey = derivedKeys[0];
return firstDerivedKey;
},
};
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