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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 = {
_calculateDerivedHDKeys(
initialHDKey: HDNode,
derivationPath: string,
searchLimit: number,
offset: number = DEFAULT_ADDRESS_SEARCH_OFFSET,
isChildKey: boolean = false,
): DerivedHDKey[] {
const derivedKeys: DerivedHDKey[] = [];
_.times(searchLimit, i => {
const derivationIndex = offset + i;
// Normally we need to set the full derivation path to walk the tree from the root
// as the initial key is at the root.
// But with ledger the initial key is a child so we walk the tree relative to that child
const path = isChildKey ? `m/${derivationIndex}` : `m/${derivationPath}/${derivationIndex}`;
const hdKey = initialHDKey.derive(path);
const derivedPublicKey = hdKey.publicKey;
const shouldSanitizePublicKey = true;
const ethereumAddressUnprefixed = ethUtil
.publicToAddress(derivedPublicKey, shouldSanitizePublicKey)
.toString('hex');
const address = ethUtil.addHexPrefix(ethereumAddressUnprefixed);
const derivedKey: DerivedHDKey = {
derivationPath,
hdKey,
address,
derivationIndex,
};
derivedKeys.push(derivedKey);
});
return derivedKeys;
},
_findDerivedKeyByAddress(
address: string,
initialHDKey: HDNode,
derivationPath: string,
searchLimit: number,
isChild: boolean = false,
): DerivedHDKey | undefined {
let matchedKey: DerivedHDKey | undefined;
for (let index = 0; index < searchLimit; index = index + BATCH_SIZE) {
const derivedKeys = walletUtils._calculateDerivedHDKeys(
initialHDKey,
derivationPath,
BATCH_SIZE,
index,
isChild,
);
matchedKey = _.find(derivedKeys, derivedKey => derivedKey.address === address);
if (matchedKey) {
break;
}
}
return matchedKey;
},
_firstDerivedKey(initialHDKey: HDNode, derivationPath: string, isChild: boolean = false): DerivedHDKey {
const derivedKeys = walletUtils._calculateDerivedHDKeys(initialHDKey, derivationPath, 1, 0, isChild);
const firstDerivedKey = derivedKeys[0];
return firstDerivedKey;
},
};
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