1 files changed, 83 insertions, 0 deletions
diff --git a/packages/contracts/src/utils/order_utils.ts b/packages/contracts/src/utils/order_utils.ts
new file mode 100644
index 000000000..10bbf4f7c
--- /dev/null
+++ b/packages/contracts/src/utils/order_utils.ts
@@ -0,0 +1,83 @@
+import { BigNumber } from '@0xproject/utils';
+import { Web3Wrapper } from '@0xproject/web3-wrapper';
+import ethUtil = require('ethereumjs-util');
+import * as _ from 'lodash';
+
+import { crypto } from './crypto';
+import { OrderStruct, SignatureType, SignedOrder, UnsignedOrder } from './types';
+
+export const orderUtils = {
+    createFill: (signedOrder: SignedOrder, takerAssetFillAmount?: BigNumber) => {
+        const fill = {
+            order: orderUtils.getOrderStruct(signedOrder),
+            takerAssetFillAmount: takerAssetFillAmount || signedOrder.takerAssetAmount,
+            signature: signedOrder.signature,
+        };
+        return fill;
+    },
+    createCancel(signedOrder: SignedOrder, takerAssetCancelAmount?: BigNumber) {
+        const cancel = {
+            order: orderUtils.getOrderStruct(signedOrder),
+            takerAssetCancelAmount: takerAssetCancelAmount || signedOrder.takerAssetAmount,
+        };
+        return cancel;
+    },
+    getOrderStruct(signedOrder: SignedOrder): OrderStruct {
+        const orderStruct = {
+            senderAddress: signedOrder.senderAddress,
+            makerAddress: signedOrder.makerAddress,
+            takerAddress: signedOrder.takerAddress,
+            feeRecipientAddress: signedOrder.feeRecipientAddress,
+            makerAssetAmount: signedOrder.makerAssetAmount,
+            takerAssetAmount: signedOrder.takerAssetAmount,
+            makerFee: signedOrder.makerFee,
+            takerFee: signedOrder.takerFee,
+            expirationTimeSeconds: signedOrder.expirationTimeSeconds,
+            salt: signedOrder.salt,
+            makerAssetData: signedOrder.makerAssetData,
+            takerAssetData: signedOrder.takerAssetData,
+        };
+        return orderStruct;
+    },
+    getOrderHashBuff(order: SignedOrder | UnsignedOrder): Buffer {
+        const orderSchemaHashBuff = crypto.solSHA3([
+            'address exchangeAddress',
+            'address makerAddress',
+            'address takerAddress',
+            'address feeRecipientAddress',
+            'address senderAddress',
+            'uint256 makerAssetAmount',
+            'uint256 takerAssetAmount',
+            'uint256 makerFee',
+            'uint256 takerFee',
+            'uint256 expirationTimeSeconds',
+            'uint256 salt',
+            'bytes makerAssetData',
+            'bytes takerAssetData',
+        ]);
+        const orderParamsHashBuff = crypto.solSHA3([
+            order.exchangeAddress,
+            order.makerAddress,
+            order.takerAddress,
+            order.feeRecipientAddress,
+            order.senderAddress,
+            order.makerAssetAmount,
+            order.takerAssetAmount,
+            order.makerFee,
+            order.takerFee,
+            order.expirationTimeSeconds,
+            order.salt,
+            ethUtil.toBuffer(order.makerAssetData),
+            ethUtil.toBuffer(order.takerAssetData),
+        ]);
+        const orderSchemaHashHex = `0x${orderSchemaHashBuff.toString('hex')}`;
+        const orderParamsHashHex = `0x${orderParamsHashBuff.toString('hex')}`;
+        const orderHashBuff = crypto.solSHA3([new BigNumber(orderSchemaHashHex), new BigNumber(orderParamsHashHex)]);
+        return orderHashBuff;
+    },
+    getOrderHashHex(order: SignedOrder | UnsignedOrder): string {
+        const orderHashBuff = orderUtils.getOrderHashBuff(order);
+        const orderHashHex = `0x${orderHashBuff.toString('hex')}`;
+        return orderHashHex;
+    },
+};