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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;
const DEFAULT_ADDRESS_SEARCH_LIMIT = 1000;
class DerivedHDKeyIterator implements IterableIterator<DerivedHDKey> {
private _initialDerivedKey: DerivedHDKey;
private _searchLimit: number;
private _index: number;
constructor(initialDerivedKey: DerivedHDKey, searchLimit: number = DEFAULT_ADDRESS_SEARCH_OFFSET) {
this._searchLimit = searchLimit;
this._initialDerivedKey = initialDerivedKey;
this._index = 0;
}
public next(): IteratorResult<DerivedHDKey> {
const derivationBasePath = this._initialDerivedKey.derivationBasePath;
const derivationIndex = this._index;
// If the DerivedHDKey is a child then we walk relative, if not we walk the full derivation path
const fullDerivationPath = `m/${derivationBasePath}/${derivationIndex}`;
const relativeDerivationPath = `m/${derivationIndex}`;
const path = this._initialDerivedKey.isChildKey ? relativeDerivationPath : fullDerivationPath;
const hdKey = this._initialDerivedKey.hdKey.derive(path);
const address = walletUtils.addressOfHDKey(hdKey);
const derivedKey: DerivedHDKey = {
address,
hdKey,
derivationPath: fullDerivationPath,
derivationBasePath: this._initialDerivedKey.derivationBasePath,
derivationIndex,
isChildKey: this._initialDerivedKey.isChildKey,
};
const done = this._index === this._searchLimit;
this._index++;
return {
done,
value: derivedKey,
};
}
public [Symbol.iterator](): IterableIterator<DerivedHDKey> {
return this;
}
}
export const walletUtils = {
DEFAULT_ADDRESS_SEARCH_LIMIT,
DEFAULT_NUM_ADDRESSES_TO_FETCH: 10,
calculateDerivedHDKeys(initialDerivedKey: DerivedHDKey, numberOfKeys: number): DerivedHDKey[] {
const derivedKeys: DerivedHDKey[] = [];
const derivedKeyIterator = new DerivedHDKeyIterator(initialDerivedKey, numberOfKeys);
for (const key of derivedKeyIterator) {
derivedKeys.push(key);
}
return derivedKeys;
},
findDerivedKeyByAddress(
address: string,
initialDerivedKey: DerivedHDKey,
searchLimit: number,
): DerivedHDKey | undefined {
let matchedKey: DerivedHDKey | undefined;
const derivedKeyIterator = new DerivedHDKeyIterator(initialDerivedKey, searchLimit);
for (const key of derivedKeyIterator) {
if (key.address === address) {
matchedKey = key;
break;
}
}
return matchedKey;
},
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;
},
};
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