From adcfaa2e80389f69e196b602955cee858a1eb40f Mon Sep 17 00:00:00 2001
From: Jacob Evans <jacob@dekz.net>
Date: Mon, 1 Oct 2018 20:37:13 +1000
Subject: Expose eth_signTypedData functionality for order signing

---
 packages/order-utils/src/eip712_utils.ts    |  6 ++--
 packages/order-utils/src/order_hash.ts      |  2 +-
 packages/order-utils/src/signature_utils.ts | 50 ++++++++++++++++++++++++++++-
 3 files changed, 53 insertions(+), 5 deletions(-)

(limited to 'packages/order-utils/src')

diff --git a/packages/order-utils/src/eip712_utils.ts b/packages/order-utils/src/eip712_utils.ts
index b303c93dc..01f1e930e 100644
--- a/packages/order-utils/src/eip712_utils.ts
+++ b/packages/order-utils/src/eip712_utils.ts
@@ -5,11 +5,11 @@ import { crypto } from './crypto';
 import { EIP712Schema, EIP712Types } from './types';
 
 const EIP191_PREFIX = '\x19\x01';
-const EIP712_DOMAIN_NAME = '0x Protocol';
-const EIP712_DOMAIN_VERSION = '2';
 const EIP712_VALUE_LENGTH = 32;
+export const EIP712_DOMAIN_NAME = '0x Protocol';
+export const EIP712_DOMAIN_VERSION = '2';
 
-const EIP712_DOMAIN_SCHEMA: EIP712Schema = {
+export const EIP712_DOMAIN_SCHEMA: EIP712Schema = {
     name: 'EIP712Domain',
     parameters: [
         { name: 'name', type: EIP712Types.String },
diff --git a/packages/order-utils/src/order_hash.ts b/packages/order-utils/src/order_hash.ts
index 8e98f8767..151c1f801 100644
--- a/packages/order-utils/src/order_hash.ts
+++ b/packages/order-utils/src/order_hash.ts
@@ -8,7 +8,7 @@ import { EIP712Schema, EIP712Types } from './types';
 
 const INVALID_TAKER_FORMAT = 'instance.takerAddress is not of a type(s) string';
 
-const EIP712_ORDER_SCHEMA: EIP712Schema = {
+export const EIP712_ORDER_SCHEMA: EIP712Schema = {
     name: 'Order',
     parameters: [
         { name: 'makerAddress', type: EIP712Types.Address },
diff --git a/packages/order-utils/src/signature_utils.ts b/packages/order-utils/src/signature_utils.ts
index 3b656d3fc..05c673ae2 100644
--- a/packages/order-utils/src/signature_utils.ts
+++ b/packages/order-utils/src/signature_utils.ts
@@ -1,5 +1,5 @@
 import { schemas } from '@0xproject/json-schemas';
-import { ECSignature, SignatureType, SignerType, ValidatorSignature } from '@0xproject/types';
+import { ECSignature, Order, SignatureType, SignerType, ValidatorSignature } from '@0xproject/types';
 import { Web3Wrapper } from '@0xproject/web3-wrapper';
 import { Provider } from 'ethereum-types';
 import * as ethUtil from 'ethereumjs-util';
@@ -7,9 +7,11 @@ import * as _ from 'lodash';
 
 import { artifacts } from './artifacts';
 import { assert } from './assert';
+import { EIP712_DOMAIN_NAME, EIP712_DOMAIN_SCHEMA, EIP712_DOMAIN_VERSION } from './eip712_utils';
 import { ExchangeContract } from './generated_contract_wrappers/exchange';
 import { IValidatorContract } from './generated_contract_wrappers/i_validator';
 import { IWalletContract } from './generated_contract_wrappers/i_wallet';
+import { EIP712_ORDER_SCHEMA } from './order_hash';
 import { OrderError } from './types';
 import { utils } from './utils';
 
@@ -191,6 +193,52 @@ export const signatureUtils = {
             return false;
         }
     },
+    /**
+     * Signs an order using `eth_signTypedData` and returns it's elliptic curve signature and signature type.
+     * This method currently supports Ganache.
+     * @param   order The Order to sign.
+     * @param   signerAddress   The hex encoded Ethereum address you wish to sign it with. This address
+     *          must be available via the Provider supplied to 0x.js.
+     * @return  A hex encoded string containing the Elliptic curve signature generated by signing the orderHash and the Signature Type.
+     */
+    async ecSignOrderAsync(provider: Provider, order: Order, signerAddress: string): Promise<string> {
+        assert.isWeb3Provider('provider', provider);
+        assert.isETHAddressHex('signerAddress', signerAddress);
+        const web3Wrapper = new Web3Wrapper(provider);
+        await assert.isSenderAddressAsync('signerAddress', signerAddress, web3Wrapper);
+        const normalizedSignerAddress = signerAddress.toLowerCase();
+        const typedData = {
+            types: {
+                EIP712Domain: EIP712_DOMAIN_SCHEMA.parameters,
+                Order: EIP712_ORDER_SCHEMA.parameters,
+            },
+            domain: {
+                name: EIP712_DOMAIN_NAME,
+                version: EIP712_DOMAIN_VERSION,
+                verifyingContract: order.exchangeAddress,
+            },
+            message: {
+                ...order,
+                salt: order.salt.toString(),
+                makerFee: order.makerFee.toString(),
+                takerFee: order.takerFee.toString(),
+                makerAssetAmount: order.makerAssetAmount.toString(),
+                takerAssetAmount: order.takerAssetAmount.toString(),
+                expirationTimeSeconds: order.expirationTimeSeconds.toString(),
+            },
+            primaryType: 'Order',
+        };
+        const signature = await web3Wrapper.signTypedDataAsync(normalizedSignerAddress, typedData);
+        const ecSignatureRSV = parseSignatureHexAsRSV(signature);
+        const signatureBuffer = Buffer.concat([
+            ethUtil.toBuffer(ecSignatureRSV.v),
+            ethUtil.toBuffer(ecSignatureRSV.r),
+            ethUtil.toBuffer(ecSignatureRSV.s),
+            ethUtil.toBuffer(SignatureType.EIP712),
+        ]);
+        const signatureHex = `0x${signatureBuffer.toString('hex')}`;
+        return signatureHex;
+    },
     /**
      * Signs an orderHash and returns it's elliptic curve signature and signature type.
      * This method currently supports TestRPC, Geth and Parity above and below V1.6.6
-- 
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