1 files changed, 80 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..513d0087e
--- /dev/null
+++ b/packages/contracts/src/utils/order_utils.ts
@@ -0,0 +1,80 @@
+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, takerTokenFillAmount?: BigNumber) => {
+        const fill = {
+            order: orderUtils.getOrderStruct(signedOrder),
+            takerTokenFillAmount: takerTokenFillAmount || signedOrder.takerTokenAmount,
+            signature: signedOrder.signature,
+        };
+        return fill;
+    },
+    createCancel(signedOrder: SignedOrder, takerTokenCancelAmount?: BigNumber) {
+        const cancel = {
+            order: orderUtils.getOrderStruct(signedOrder),
+            takerTokenCancelAmount: takerTokenCancelAmount || signedOrder.takerTokenAmount,
+        };
+        return cancel;
+    },
+    getOrderStruct(signedOrder: SignedOrder): OrderStruct {
+        const orderStruct = {
+            makerAddress: signedOrder.makerAddress,
+            takerAddress: signedOrder.takerAddress,
+            makerTokenAddress: signedOrder.makerTokenAddress,
+            takerTokenAddress: signedOrder.takerTokenAddress,
+            feeRecipientAddress: signedOrder.feeRecipientAddress,
+            makerTokenAmount: signedOrder.makerTokenAmount,
+            takerTokenAmount: signedOrder.takerTokenAmount,
+            makerFeeAmount: signedOrder.makerFeeAmount,
+            takerFeeAmount: signedOrder.takerFeeAmount,
+            expirationTimeSeconds: signedOrder.expirationTimeSeconds,
+            salt: signedOrder.salt,
+        };
+        return orderStruct;
+    },
+    getOrderHashBuff(order: SignedOrder | UnsignedOrder): Buffer {
+        const orderSchemaHashBuff = crypto.solSHA3([
+            'address exchangeAddress',
+            'address makerAddress',
+            'address takerAddress',
+            'address makerTokenAddress',
+            'address takerTokenAddress',
+            'address feeRecipientAddress',
+            'uint256 makerTokenAmount',
+            'uint256 takerTokenAmount',
+            'uint256 makerFeeAmount',
+            'uint256 takerFeeAmount',
+            'uint256 expirationTimeSeconds',
+            'uint256 salt',
+        ]);
+        const orderSchemaHashHex = `0x${orderSchemaHashBuff.toString('hex')}`;
+        const orderHashBuff = crypto.solSHA3([
+            order.exchangeAddress,
+            order.makerAddress,
+            order.takerAddress,
+            order.makerTokenAddress,
+            order.takerTokenAddress,
+            order.feeRecipientAddress,
+            order.makerTokenAmount,
+            order.takerTokenAmount,
+            order.makerFeeAmount,
+            order.takerFeeAmount,
+            order.expirationTimeSeconds,
+            order.salt,
+        ]);
+        const orderHashHex = `0x${orderHashBuff.toString('hex')}`;
+        const prefixedOrderHashBuff = crypto.solSHA3([new BigNumber(orderSchemaHashHex), new BigNumber(orderHashHex)]);
+        return prefixedOrderHashBuff;
+    },
+    getOrderHashHex(order: SignedOrder | UnsignedOrder): string {
+        const orderHashBuff = orderUtils.getOrderHashBuff(order);
+        const orderHashHex = `0x${orderHashBuff.toString('hex')}`;
+        return orderHashHex;
+    },
+};