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import ethUtil = require('ethereumjs-util');
import HDNode = require('hdkey');
import * as _ from 'lodash';
import { DerivedHDKeyInfo, WalletSubproviderErrors } from '../types';
const DEFAULT_ADDRESS_SEARCH_LIMIT = 1000;
class DerivedHDKeyInfoIterator implements IterableIterator<DerivedHDKeyInfo> {
private _initialDerivedKey: DerivedHDKeyInfo;
private _searchLimit: number;
private _index: number;
constructor(initialDerivedKey: DerivedHDKeyInfo, searchLimit: number = DEFAULT_ADDRESS_SEARCH_LIMIT) {
this._searchLimit = searchLimit;
this._initialDerivedKey = initialDerivedKey;
this._index = 0;
}
public next(): IteratorResult<DerivedHDKeyInfo> {
const baseDerivationPath = this._initialDerivedKey.baseDerivationPath;
const derivationIndex = this._index;
const isChildKey = this._initialDerivedKey.isChildKey;
// If the DerivedHDKey is a child then we walk relative, if not we walk the full derivation path
const fullDerivationPath = `m/${baseDerivationPath}/${derivationIndex}`;
const relativeDerivationPath = `m/${derivationIndex}`;
const path = isChildKey ? relativeDerivationPath : fullDerivationPath;
const hdKey = this._initialDerivedKey.hdKey.derive(path);
const address = walletUtils.addressOfHDKey(hdKey);
const derivedKey: DerivedHDKeyInfo = {
address,
hdKey,
baseDerivationPath,
derivationIndex,
derivationPath: fullDerivationPath,
isChildKey,
};
const done = this._index === this._searchLimit;
this._index++;
return {
done,
value: derivedKey,
};
}
public [Symbol.iterator](): IterableIterator<DerivedHDKeyInfo> {
return this;
}
}
export const walletUtils = {
calculateDerivedHDKeyInfos(initialDerivedKey: DerivedHDKeyInfo, numberOfKeys: number): DerivedHDKeyInfo[] {
const derivedKeys: DerivedHDKeyInfo[] = [];
const derivedKeyIterator = new DerivedHDKeyInfoIterator(initialDerivedKey, numberOfKeys);
for (const key of derivedKeyIterator) {
derivedKeys.push(key);
}
return derivedKeys;
},
findDerivedKeyInfoForAddressIfExists(
address: string,
initialDerivedKey: DerivedHDKeyInfo,
searchLimit: number,
): DerivedHDKeyInfo | undefined {
let matchedKey: DerivedHDKeyInfo | undefined;
const derivedKeyIterator = new DerivedHDKeyInfoIterator(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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