Formatting and standards updates

3 files changed, 272 insertions, 0 deletions

diff --git a/packages/subproviders/src/index.ts b/packages/subproviders/src/index.ts
index 6cc650a4d..0e1579706 100644
--- a/packages/subproviders/src/index.ts
+++ b/packages/subproviders/src/index.ts
@@ -15,6 +15,7 @@ export { Subprovider } from './subproviders/subprovider';
 export { NonceTrackerSubprovider } from './subproviders/nonce_tracker';
 export { PrivateKeyWalletSubprovider } from './subproviders/private_key_wallet';
 export { MnemonicWalletSubprovider } from './subproviders/mnemonic_wallet';
+export { EthLightwalletSubprovider } from './subproviders/eth_lightwallet';
 export {
     Callback,
     ErrorCallback,
diff --git a/packages/subproviders/src/subproviders/eth_lightwallet.ts b/packages/subproviders/src/subproviders/eth_lightwallet.ts
new file mode 100644
index 000000000..af4ea77e9
--- /dev/null
+++ b/packages/subproviders/src/subproviders/eth_lightwallet.ts
@@ -0,0 +1,88 @@
+import { assert } from '@0xproject/assert';
+import { ECSignatureBuffer } from '@0xproject/types';
+import { addressUtils } from '@0xproject/utils';
+import * as lightwallet from 'eth-lightwallet';
+import EthereumTx = require('ethereumjs-tx');
+import * as _ from 'lodash';
+
+import { PartialTxParams, WalletSubproviderErrors } from '../types';
+
+import { BaseWalletSubprovider } from './base_wallet_subprovider';
+
+/*
+ * This class implements the [web3-provider-engine](https://github.com/MetaMask/provider-engine) subprovider interface.
+ * This subprovider intercepts all account related RPC requests (e.g message/transaction signing, etc...) and
+ * re-routes them to [eth-lightwallet](https://github.com/ConsenSys/eth-lightwallet).
+ */
+export class EthLightwalletSubprovider extends BaseWalletSubprovider {
+    private _signing: lightwallet.signing;
+    private _keystore: lightwallet.keystore;
+    private _pwDerivedKey: Uint8Array;
+    /**
+     * Instantiates a EthLightwalletSubprovider
+     * @param signing The lightwallet module containing signing functions
+     * @param keystore An instance of the lightwallet keystore
+     * @param pwDerivedKey The users password derived key
+     */
+    constructor(signing: lightwallet.signing, keystore: lightwallet.keystore, pwDerivedKey: Uint8Array) {
+        super();
+
+        this._signing = signing;
+        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> {
+        if (_.isUndefined(txParams.from) || !addressUtils.isAddress(txParams.from)) {
+            throw new Error(WalletSubproviderErrors.FromAddressMissingOrInvalid);
+        }
+
+        const tx = new EthereumTx(txParams);
+        const txHex = tx.serialize().toString('hex');
+        let signedTxHex: string = this._signing.signTx(this._keystore, this._pwDerivedKey, txHex, txParams.from);
+
+        signedTxHex = `0x${signedTxHex}`;
+
+        return signedTxHex;
+    }
+    /**
+     * Sign a personal Ethereum signed message. The signing account will be the account
+     * associated with the provided address.
+     * If you've added the EthLightwalletSubprovider 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> {
+        if (_.isUndefined(data)) {
+            throw new Error(WalletSubproviderErrors.DataMissingForSignPersonalMessage);
+        }
+        assert.isHexString('data', data);
+        assert.isETHAddressHex('address', address);
+        const result: ECSignatureBuffer = this._signing.signMsgHash(this._keystore, this._pwDerivedKey, data, address);
+
+        const signature = this._signing.concatSig(result);
+
+        return signature;
+    }
+}
diff --git a/packages/subproviders/test/unit/eth_lightwallet_subprovider_test.ts b/packages/subproviders/test/unit/eth_lightwallet_subprovider_test.ts
new file mode 100644
index 000000000..762163338
--- /dev/null
+++ b/packages/subproviders/test/unit/eth_lightwallet_subprovider_test.ts
@@ -0,0 +1,183 @@
+import { JSONRPCResponsePayload } from '@0xproject/types';
+import * as chai from 'chai';
+import * as lightwallet from 'eth-lightwallet';
+import Web3ProviderEngine = require('web3-provider-engine');
+import RpcSubprovider = require('web3-provider-engine/subproviders/rpc');
+
+import { EthLightwalletSubprovider } from '../../src';
+import { DoneCallback } from '../../src/types';
+import { chaiSetup } from '../chai_setup';
+import { ganacheSubprovider } from '../utils/ganache_subprovider';
+import { reportCallbackErrors } from '../utils/report_callback_errors';
+
+chaiSetup.configure();
+const expect = chai.expect;
+const FAKE_ADDRESS = '0x44be42fd88e22387c43ba9b75941aa3e680dae25';
+const NUM_GENERATED_ADDRESSES = 10;
+const PASSWORD = 'supersecretpassword99';
+const SEED_PHRASE = 'dilemma hollow outer pony cube season start stereo surprise when edit blast';
+const SALT = 'kvODghzs7Ff1uqHyI0P3wI4Hso4w4iWT2e9qmrWz0y4';
+const HD_PATH_STRING = `m/44'/60'/0'`;
+
+describe('EthLightwalletSubprovider', () => {
+    let ethLightwalletSubprovider: EthLightwalletSubprovider;
+    before(async () => {
+        const options = {
+            password: PASSWORD,
+            seedPhrase: SEED_PHRASE,
+            salt: SALT,
+            hdPathString: HD_PATH_STRING,
+        };
+
+        const createVaultAsync = async (vaultOptions: lightwallet.VaultOptions) => {
+            return new Promise<lightwallet.keystore>(resolve => {
+                // Create Vault
+                lightwallet.keystore.createVault(vaultOptions, (err: Error, vaultKeystore) => {
+                    resolve(vaultKeystore);
+                });
+            });
+        };
+
+        const deriveKeyFromPasswordAsync = async (vaultKeystore: lightwallet.keystore) => {
+            return new Promise<Uint8Array>(resolve => {
+                vaultKeystore.keyFromPassword(PASSWORD, (err: Error, passwordDerivedKey: Uint8Array) => {
+                    resolve(passwordDerivedKey);
+                });
+            });
+        };
+
+        const keystore: lightwallet.keystore = await createVaultAsync(options);
+        const pwDerivedKey: Uint8Array = await deriveKeyFromPasswordAsync(keystore);
+
+        // Generate 10 addresses
+        keystore.generateNewAddress(pwDerivedKey, NUM_GENERATED_ADDRESSES);
+
+        // Initialize Subprovider
+        ethLightwalletSubprovider = new EthLightwalletSubprovider(lightwallet.signing, keystore, pwDerivedKey);
+    });
+    describe('direct method calls', () => {
+        describe('success cases', () => {
+            it('returns a list of accounts', async () => {
+                const accounts = await ethLightwalletSubprovider.getAccountsAsync();
+                expect(accounts[0]).to.be.equal(FAKE_ADDRESS);
+                expect(accounts.length).to.be.equal(NUM_GENERATED_ADDRESSES);
+            });
+            it('signs a personal message hash', async () => {
+                const signingAccount = (await ethLightwalletSubprovider.getAccountsAsync())[0];
+
+                // Keccak-256 hash of 'hello world'
+                const messageHash = '0x47173285a8d7341e5e972fc677286384f802f8ef42a5ec5f03bbfa254cb01fad';
+                const ecSignatureHex = await ethLightwalletSubprovider.signPersonalMessageAsync(
+                    messageHash,
+                    signingAccount,
+                );
+                expect(ecSignatureHex).to.be.equal(
+                    // tslint:disable-next-line:max-line-length
+                    '0xa46b696c1aa8f91dbb33d1a66f6440bf3cf334c9dc45dc389668c1e60e2db31e259400b41f31632fa994837054c5345c88dc455c13931332489029adee6fd24d1b',
+                );
+            });
+        });
+    });
+    describe('calls through a provider', () => {
+        let provider: Web3ProviderEngine;
+        before(() => {
+            provider = new Web3ProviderEngine();
+            provider.addProvider(ethLightwalletSubprovider);
+            provider.addProvider(ganacheSubprovider);
+            provider.start();
+        });
+        describe('success cases', () => {
+            it('returns a list of accounts', (done: DoneCallback) => {
+                const payload = {
+                    jsonrpc: '2.0',
+                    method: 'eth_accounts',
+                    params: [],
+                    id: 1,
+                };
+                const callback = reportCallbackErrors(done)((err: Error, response: JSONRPCResponsePayload) => {
+                    expect(err).to.be.a('null');
+                    expect(response.result.length).to.be.equal(NUM_GENERATED_ADDRESSES);
+                    expect(response.result[0]).to.be.equal(FAKE_ADDRESS);
+                    done();
+                });
+                provider.sendAsync(payload, callback);
+            });
+            it('signs a personal message hash with eth_sign', (done: DoneCallback) => {
+                // Keccak-256 hash of 'hello world'
+                const messageHash = '0x47173285a8d7341e5e972fc677286384f802f8ef42a5ec5f03bbfa254cb01fad';
+                const payload = {
+                    jsonrpc: '2.0',
+                    method: 'eth_sign',
+                    params: ['0x44be42fd88e22387c43ba9b75941aa3e680dae25', messageHash],
+                    id: 1,
+                };
+                const callback = reportCallbackErrors(done)((err: Error, response: JSONRPCResponsePayload) => {
+                    expect(err).to.be.a('null');
+                    expect(response.result).to.be.equal(
+                        // tslint:disable-next-line:max-line-length
+                        '0xa46b696c1aa8f91dbb33d1a66f6440bf3cf334c9dc45dc389668c1e60e2db31e259400b41f31632fa994837054c5345c88dc455c13931332489029adee6fd24d1b',
+                    );
+                    done();
+                });
+                provider.sendAsync(payload, callback);
+            });
+            it('signs a transaction', (done: DoneCallback) => {
+                const tx = {
+                    to: '0xafa3f8684e54059998bc3a7b0d2b0da075154d66',
+                    value: '0x00',
+                    gasPrice: '0x00',
+                    nonce: '0x00',
+                    gas: '0x00',
+                    from: '0x44be42fd88e22387c43ba9b75941aa3e680dae25',
+                };
+                const payload = {
+                    jsonrpc: '2.0',
+                    method: 'eth_signTransaction',
+                    params: [tx],
+                    id: 1,
+                };
+                const callback = reportCallbackErrors(done)((err: Error, response: JSONRPCResponsePayload) => {
+                    const expectedResponseLength = 192;
+
+                    expect(err).to.be.a('null');
+                    expect(response.result.raw.length).to.be.equal(expectedResponseLength);
+                    expect(response.result.raw.substr(0, 2)).to.be.equal('0x');
+                    done();
+                });
+                provider.sendAsync(payload, callback);
+            });
+        });
+        describe('failure cases', () => {
+            it('should throw if `data` param not hex when calling eth_sign', (done: DoneCallback) => {
+                const nonHexMessage = 'hello world';
+                const payload = {
+                    jsonrpc: '2.0',
+                    method: 'eth_sign',
+                    params: ['0x0000000000000000000000000000000000000000', nonHexMessage],
+                    id: 1,
+                };
+                const callback = reportCallbackErrors(done)((err: Error, response: JSONRPCResponsePayload) => {
+                    expect(err).to.not.be.a('null');
+                    expect(err.message).to.be.equal('Expected data to be of type HexString, encountered: hello world');
+                    done();
+                });
+                provider.sendAsync(payload, callback);
+            });
+            it('should throw if `data` param not hex when calling personal_sign', (done: DoneCallback) => {
+                const nonHexMessage = 'hello world';
+                const payload = {
+                    jsonrpc: '2.0',
+                    method: 'personal_sign',
+                    params: [nonHexMessage, '0x0000000000000000000000000000000000000000'],
+                    id: 1,
+                };
+                const callback = reportCallbackErrors(done)((err: Error, response: JSONRPCResponsePayload) => {
+                    expect(err).to.not.be.a('null');
+                    expect(err.message).to.be.equal('Expected data to be of type HexString, encountered: hello world');
+                    done();
+                });
+                provider.sendAsync(payload, callback);
+            });
+        });
+    });
+});