1 files changed, 37 insertions, 0 deletions
diff --git a/packages/contracts/src/utils/order_factory.ts b/packages/contracts/src/utils/order_factory.ts
new file mode 100644
index 000000000..8ba5df24a
--- /dev/null
+++ b/packages/contracts/src/utils/order_factory.ts
@@ -0,0 +1,37 @@
+import { Order, SignedOrder, ZeroEx } from '0x.js';
+import { BigNumber } from '@0xproject/utils';
+import { Web3Wrapper } from '@0xproject/web3-wrapper';
+import * as _ from 'lodash';
+
+import { DefaultOrderParams } from './types';
+
+export class OrderFactory {
+    private _defaultOrderParams: Partial<Order>;
+    private _zeroEx: ZeroEx;
+    constructor(zeroEx: ZeroEx, defaultOrderParams: Partial<Order>) {
+        this._defaultOrderParams = defaultOrderParams;
+        this._zeroEx = zeroEx;
+    }
+    public async newSignedOrderAsync(customOrderParams: Partial<Order> = {}): Promise<SignedOrder> {
+        const randomExpiration = new BigNumber(Math.floor((Date.now() + Math.random() * 100000000000) / 1000));
+        const order = ({
+            expirationUnixTimestampSec: randomExpiration,
+            salt: ZeroEx.generatePseudoRandomSalt(),
+            taker: ZeroEx.NULL_ADDRESS,
+            ...this._defaultOrderParams,
+            ...customOrderParams,
+        } as any) as Order;
+        const orderHashHex = ZeroEx.getOrderHashHex(order);
+        const shouldAddPersonalMessagePrefix = false;
+        const ecSignature = await this._zeroEx.signOrderHashAsync(
+            orderHashHex,
+            order.maker,
+            shouldAddPersonalMessagePrefix,
+        );
+        const signedOrder = {
+            ...order,
+            ecSignature,
+        };
+        return signedOrder;
+    }
+}