Merge pull request #775 from RadarRelay/eth-lightwallet-subprovider-final

Eth lightwallet subprovider (replaces #660)

3 files changed, 69 insertions, 5 deletions

diff --git a/packages/subproviders/src/globals.d.ts b/packages/subproviders/src/globals.d.ts
index c00dc4099..94e63a32d 100644
--- a/packages/subproviders/src/globals.d.ts
+++ b/packages/subproviders/src/globals.d.ts
@@ -1,8 +1,3 @@
-// tslint:disable:max-classes-per-file
-// tslint:disable:class-name
-// tslint:disable:async-suffix
-// tslint:disable:completed-docs
-
 declare module '*.json' {
     const json: any;
     /* tslint:disable */
diff --git a/packages/subproviders/src/index.ts b/packages/subproviders/src/index.ts
index 9194c1341..802a27cb1 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_subprovider';
 export {
     Callback,
     ErrorCallback,
diff --git a/packages/subproviders/src/subproviders/eth_lightwallet_subprovider.ts b/packages/subproviders/src/subproviders/eth_lightwallet_subprovider.ts
new file mode 100644
index 000000000..a9ebbb790
--- /dev/null
+++ b/packages/subproviders/src/subproviders/eth_lightwallet_subprovider.ts
@@ -0,0 +1,68 @@
+import * as lightwallet from 'eth-lightwallet';
+
+import { PartialTxParams } 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;
+    }
+}