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import ethUtil = require('ethereumjs-util');
import HDNode = require('hdkey');
import { DerivedHDKeyInfo } from '../types';
const DEFAULT_ADDRESS_SEARCH_LIMIT = 1000;
class DerivedHDKeyInfoIterator implements IterableIterator<DerivedHDKeyInfo> {
private readonly _parentDerivedKeyInfo: DerivedHDKeyInfo;
private readonly _searchLimit: number;
private _index: number;
constructor(initialDerivedKey: DerivedHDKeyInfo, searchLimit: number = DEFAULT_ADDRESS_SEARCH_LIMIT) {
this._searchLimit = searchLimit;
this._parentDerivedKeyInfo = initialDerivedKey;
this._index = 0;
}
public next(): IteratorResult<DerivedHDKeyInfo> {
const baseDerivationPath = this._parentDerivedKeyInfo.baseDerivationPath;
const derivationIndex = this._index;
const fullDerivationPath = `m/${baseDerivationPath}/${derivationIndex}`;
const path = `m/${derivationIndex}`;
const hdKey = this._parentDerivedKeyInfo.hdKey.derive(path);
const address = walletUtils.addressOfHDKey(hdKey);
const derivedKey: DerivedHDKeyInfo = {
address,
hdKey,
baseDerivationPath,
derivationPath: fullDerivationPath,
};
const isDone = this._index === this._searchLimit;
this._index++;
return {
done: isDone,
value: derivedKey,
};
}
public [Symbol.iterator](): IterableIterator<DerivedHDKeyInfo> {
return this;
}
}
export const walletUtils = {
calculateDerivedHDKeyInfos(parentDerivedKeyInfo: DerivedHDKeyInfo, numberOfKeys: number): DerivedHDKeyInfo[] {
const derivedKeys: DerivedHDKeyInfo[] = [];
const derivedKeyIterator = new DerivedHDKeyInfoIterator(parentDerivedKeyInfo, numberOfKeys);
for (const key of derivedKeyIterator) {
derivedKeys.push(key);
}
return derivedKeys;
},
findDerivedKeyInfoForAddressIfExists(
address: string,
parentDerivedKeyInfo: DerivedHDKeyInfo,
searchLimit: number,
): DerivedHDKeyInfo | undefined {
const lowercaseAddress = address.toLowerCase();
let matchedKey: DerivedHDKeyInfo | undefined;
const derivedKeyIterator = new DerivedHDKeyInfoIterator(parentDerivedKeyInfo, searchLimit);
for (const key of derivedKeyIterator) {
if (key.address === lowercaseAddress) {
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).toLowerCase();
return address;
},
};
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