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..044e9b865
--- /dev/null
+++ b/packages/contracts/src/utils/order_factory.ts
@@ -0,0 +1,37 @@
+import { ZeroEx } from '0x.js';
+import { BigNumber } from '@0xproject/utils';
+import * as _ from 'lodash';
+
+import { orderUtils } from './order_utils';
+import { signingUtils } from './signing_utils';
+import { SignatureType, SignedOrder, UnsignedOrder } from './types';
+
+export class OrderFactory {
+    private _defaultOrderParams: Partial<UnsignedOrder>;
+    private _privateKey: Buffer;
+    constructor(privateKey: Buffer, defaultOrderParams: Partial<UnsignedOrder>) {
+        this._defaultOrderParams = defaultOrderParams;
+        this._privateKey = privateKey;
+    }
+    public newSignedOrder(
+        customOrderParams: Partial<UnsignedOrder> = {},
+        signatureType: SignatureType = SignatureType.Ecrecover,
+    ): SignedOrder {
+        const randomExpiration = new BigNumber(Math.floor((Date.now() + Math.random() * 100000000000) / 1000));
+        const order = ({
+            senderAddress: ZeroEx.NULL_ADDRESS,
+            expirationTimeSeconds: randomExpiration,
+            salt: ZeroEx.generatePseudoRandomSalt(),
+            takerAddress: ZeroEx.NULL_ADDRESS,
+            ...this._defaultOrderParams,
+            ...customOrderParams,
+        } as any) as UnsignedOrder;
+        const orderHashBuff = orderUtils.getOrderHashBuff(order);
+        const signature = signingUtils.signMessage(orderHashBuff, this._privateKey, signatureType);
+        const signedOrder = {
+            ...order,
+            signature: `0x${signature.toString('hex')}`,
+        };
+        return signedOrder;
+    }
+}