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import { assert } from '@0xproject/assert';
import { addressUtils } from '@0xproject/utils';
import * as lightwallet from 'eth-lightwallet';
import EthereumTx = require('ethereumjs-tx');
import * as ethUtil from 'ethereumjs-util';
import * as _ from 'lodash';
import { PartialTxParams, WalletSubproviderErrors } from '../types';
import { BaseWalletSubprovider } from './base_wallet_subprovider';
import { PrivateKeyWalletSubprovider } from './private_key_wallet';
/*
* This class implements the web3-provider-engine subprovider interface and forwards
* requests involving user accounts and signing operations to eth-lightwallet
*
* Source: https://github.com/MetaMask/provider-engine/blob/master/subproviders/subprovider.js
*/
export class EthLightwalletSubprovider extends BaseWalletSubprovider {
private _keystore: lightwallet.keystore;
private _pwDerivedKey: Uint8Array;
constructor(keystore: lightwallet.keystore, pwDerivedKey: Uint8Array) {
super();
this._keystore = keystore;
this._pwDerivedKey = pwDerivedKey;
}
/**
* Retrieve the accounts associated with the eth-lightwallet instance.
* This method is implicitly called when issuing a `eth_accounts` JSON RPC request
* via your providerEngine instance.
*
* @return An array of accounts
*/
public async getAccountsAsync(): Promise<string[]> {
const accounts = this._keystore.getAddresses();
return accounts;
}
/**
* Signs a transaction with the account specificed by the `from` field in txParams.
* If you've added this Subprovider to your app's provider, you can simply send
* an `eth_sendTransaction` JSON RPC request, and this method will be called auto-magically.
* If you are not using this via a ProviderEngine instance, you can call it directly.
* @param txParams Parameters of the transaction to sign
* @return Signed transaction hex string
*/
public async signTransactionAsync(txParams: PartialTxParams): Promise<string> {
// Lightwallet loses the chain id information when hex encoding the transaction
// this results in a different signature on certain networks. PrivateKeyWallet
// respects this as it uses the parameters passed in
let privKey = this._keystore.exportPrivateKey(txParams.from, this._pwDerivedKey);
const privKeyWallet = new PrivateKeyWalletSubprovider(privKey);
privKey = '';
const privKeySignature = await privKeyWallet.signTransactionAsync(txParams);
return privKeySignature;
}
/**
* Sign a personal Ethereum signed message. The signing account will be the account
* associated with the provided address.
* If you've added the MnemonicWalletSubprovider to your app's provider, you can simply send an `eth_sign`
* or `personal_sign` JSON RPC request, and this method will be called auto-magically.
* If you are not using this via a ProviderEngine instance, you can call it directly.
* @param data Hex string message to sign
* @param address Address of the account to sign with
* @return Signature hex string (order: rsv)
*/
public async signPersonalMessageAsync(data: string, address: string): Promise<string> {
let privKey = this._keystore.exportPrivateKey(address, this._pwDerivedKey);
const privKeyWallet = new PrivateKeyWalletSubprovider(privKey);
privKey = '';
const result = privKeyWallet.signPersonalMessageAsync(data, address);
return result;
}
}
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