Initial refactor of order-utils. Move many utils from contracts into this package.

10 files changed, 25 insertions, 316 deletions

diff --git a/packages/contracts/src/utils/address_utils.ts b/packages/contracts/src/utils/address_utils.ts
index dc63459f9..a9fb6921a 100644
--- a/packages/contracts/src/utils/address_utils.ts
+++ b/packages/contracts/src/utils/address_utils.ts
@@ -1,6 +1,4 @@
-import { generatePseudoRandomSalt } from '@0xproject/order-utils';
-
-import { crypto } from './crypto';
+import { crypto, generatePseudoRandomSalt } from '@0xproject/order-utils';
 
 export const addressUtils = {
     generatePseudoRandomAddress(): string {
diff --git a/packages/contracts/src/utils/asset_proxy_utils.ts b/packages/contracts/src/utils/asset_proxy_utils.ts
deleted file mode 100644
index c042da5d0..000000000
--- a/packages/contracts/src/utils/asset_proxy_utils.ts
+++ /dev/null
@@ -1,144 +0,0 @@
-import { BigNumber } from '@0xproject/utils';
-import BN = require('bn.js');
-import ethUtil = require('ethereumjs-util');
-
-import { AssetProxyId, ERC20ProxyData, ERC721ProxyData, ProxyData } from './types';
-
-export const assetProxyUtils = {
-    encodeAssetProxyId(assetProxyId: AssetProxyId): Buffer {
-        return ethUtil.toBuffer(assetProxyId);
-    },
-    decodeAssetProxyId(encodedAssetProxyId: Buffer): AssetProxyId {
-        return ethUtil.bufferToInt(encodedAssetProxyId);
-    },
-    encodeAddress(address: string): Buffer {
-        if (!ethUtil.isValidAddress(address)) {
-            throw new Error(`Invalid Address: ${address}`);
-        }
-        const encodedAddress = ethUtil.toBuffer(address);
-        return encodedAddress;
-    },
-    decodeAddress(encodedAddress: Buffer): string {
-        const address = ethUtil.bufferToHex(encodedAddress);
-        if (!ethUtil.isValidAddress(address)) {
-            throw new Error(`Invalid Address: ${address}`);
-        }
-        return address;
-    },
-    encodeUint256(value: BigNumber): Buffer {
-        const formattedValue = new BN(value.toString(10));
-        const encodedValue = ethUtil.toBuffer(formattedValue);
-        const paddedValue = ethUtil.setLengthLeft(encodedValue, 32);
-        return paddedValue;
-    },
-    decodeUint256(encodedValue: Buffer): BigNumber {
-        const formattedValue = ethUtil.bufferToHex(encodedValue);
-        const value = new BigNumber(formattedValue, 16);
-        return value;
-    },
-    encodeERC20ProxyData(tokenAddress: string): string {
-        const encodedAssetProxyId = assetProxyUtils.encodeAssetProxyId(AssetProxyId.ERC20);
-        const encodedAddress = assetProxyUtils.encodeAddress(tokenAddress);
-        const encodedMetadata = Buffer.concat([encodedAssetProxyId, encodedAddress]);
-        const encodedMetadataHex = ethUtil.bufferToHex(encodedMetadata);
-        return encodedMetadataHex;
-    },
-    decodeERC20ProxyData(proxyData: string): ERC20ProxyData {
-        const encodedProxyMetadata = ethUtil.toBuffer(proxyData);
-        if (encodedProxyMetadata.byteLength !== 21) {
-            throw new Error(
-                `Could not decode ERC20 Proxy Data. Expected length of encoded data to be 21. Got ${
-                    encodedProxyMetadata.byteLength
-                }`,
-            );
-        }
-        const encodedAssetProxyId = encodedProxyMetadata.slice(0, 1);
-        const assetProxyId = assetProxyUtils.decodeAssetProxyId(encodedAssetProxyId);
-        if (assetProxyId !== AssetProxyId.ERC20) {
-            throw new Error(
-                `Could not decode ERC20 Proxy Data. Expected Asset Proxy Id to be ERC20 (${
-                    AssetProxyId.ERC20
-                }), but got ${assetProxyId}`,
-            );
-        }
-        const encodedTokenAddress = encodedProxyMetadata.slice(1, 21);
-        const tokenAddress = assetProxyUtils.decodeAddress(encodedTokenAddress);
-        const erc20ProxyData = {
-            assetProxyId,
-            tokenAddress,
-        };
-        return erc20ProxyData;
-    },
-    encodeERC721ProxyData(tokenAddress: string, tokenId: BigNumber): string {
-        const encodedAssetProxyId = assetProxyUtils.encodeAssetProxyId(AssetProxyId.ERC721);
-        const encodedAddress = assetProxyUtils.encodeAddress(tokenAddress);
-        const encodedTokenId = assetProxyUtils.encodeUint256(tokenId);
-        const encodedMetadata = Buffer.concat([encodedAssetProxyId, encodedAddress, encodedTokenId]);
-        const encodedMetadataHex = ethUtil.bufferToHex(encodedMetadata);
-        return encodedMetadataHex;
-    },
-    decodeERC721ProxyData(proxyData: string): ERC721ProxyData {
-        const encodedProxyMetadata = ethUtil.toBuffer(proxyData);
-        if (encodedProxyMetadata.byteLength !== 53) {
-            throw new Error(
-                `Could not decode ERC20 Proxy Data. Expected length of encoded data to be 53. Got ${
-                    encodedProxyMetadata.byteLength
-                }`,
-            );
-        }
-        const encodedAssetProxyId = encodedProxyMetadata.slice(0, 1);
-        const assetProxyId = assetProxyUtils.decodeAssetProxyId(encodedAssetProxyId);
-        if (assetProxyId !== AssetProxyId.ERC721) {
-            throw new Error(
-                `Could not decode ERC721 Proxy Data. Expected Asset Proxy Id to be ERC721 (${
-                    AssetProxyId.ERC721
-                }), but got ${assetProxyId}`,
-            );
-        }
-        const encodedTokenAddress = encodedProxyMetadata.slice(1, 21);
-        const tokenAddress = assetProxyUtils.decodeAddress(encodedTokenAddress);
-        const encodedTokenId = encodedProxyMetadata.slice(21, 53);
-        const tokenId = assetProxyUtils.decodeUint256(encodedTokenId);
-        const erc721ProxyData = {
-            assetProxyId,
-            tokenAddress,
-            tokenId,
-        };
-        return erc721ProxyData;
-    },
-    decodeProxyDataId(proxyData: string): AssetProxyId {
-        const encodedProxyMetadata = ethUtil.toBuffer(proxyData);
-        if (encodedProxyMetadata.byteLength < 1) {
-            throw new Error(
-                `Could not decode Proxy Data. Expected length of encoded data to be at least 1. Got ${
-                    encodedProxyMetadata.byteLength
-                }`,
-            );
-        }
-        const encodedAssetProxyId = encodedProxyMetadata.slice(0, 1);
-        const assetProxyId = assetProxyUtils.decodeAssetProxyId(encodedAssetProxyId);
-        return assetProxyId;
-    },
-    decodeProxyData(proxyData: string): ProxyData {
-        const assetProxyId = assetProxyUtils.decodeProxyDataId(proxyData);
-        switch (assetProxyId) {
-            case AssetProxyId.ERC20:
-                const erc20ProxyData = assetProxyUtils.decodeERC20ProxyData(proxyData);
-                const generalizedERC20ProxyData = {
-                    assetProxyId,
-                    tokenAddress: erc20ProxyData.tokenAddress,
-                };
-                return generalizedERC20ProxyData;
-            case AssetProxyId.ERC721:
-                const erc721ProxyData = assetProxyUtils.decodeERC721ProxyData(proxyData);
-                const generaliedERC721ProxyData = {
-                    assetProxyId,
-                    tokenAddress: erc721ProxyData.tokenAddress,
-                    data: erc721ProxyData.tokenId,
-                };
-                return generaliedERC721ProxyData;
-            default:
-                throw new Error(`Unrecognized asset proxy id: ${assetProxyId}`);
-        }
-    },
-};
diff --git a/packages/contracts/src/utils/crypto.ts b/packages/contracts/src/utils/crypto.ts
deleted file mode 100644
index 80c5f30a5..000000000
--- a/packages/contracts/src/utils/crypto.ts
+++ /dev/null
@@ -1,45 +0,0 @@
-import BN = require('bn.js');
-import ABI = require('ethereumjs-abi');
-import ethUtil = require('ethereumjs-util');
-import * as _ from 'lodash';
-
-export const crypto = {
-    /**
-     * We convert types from JS to Solidity as follows:
-     * BigNumber -> uint256
-     * number -> uint8
-     * string -> string
-     * boolean -> bool
-     * valid Ethereum address -> address
-     */
-    solSHA3(args: any[]): Buffer {
-        return crypto._solHash(args, ABI.soliditySHA3);
-    },
-    solSHA256(args: any[]): Buffer {
-        return crypto._solHash(args, ABI.soliditySHA256);
-    },
-    _solHash(args: any[], hashFunction: (types: string[], values: any[]) => Buffer): Buffer {
-        const argTypes: string[] = [];
-        _.each(args, (arg, i) => {
-            const isNumber = _.isFinite(arg);
-            if (isNumber) {
-                argTypes.push('uint8');
-            } else if (arg.isBigNumber) {
-                argTypes.push('uint256');
-                args[i] = new BN(arg.toString(10), 10);
-            } else if (ethUtil.isValidAddress(arg)) {
-                argTypes.push('address');
-            } else if (_.isString(arg)) {
-                argTypes.push('string');
-            } else if (_.isBuffer(arg)) {
-                argTypes.push('bytes');
-            } else if (_.isBoolean(arg)) {
-                argTypes.push('bool');
-            } else {
-                throw new Error(`Unable to guess arg type: ${arg}`);
-            }
-        });
-        const hash = hashFunction(argTypes, args);
-        return hash;
-    },
-};
diff --git a/packages/contracts/src/utils/exchange_wrapper.ts b/packages/contracts/src/utils/exchange_wrapper.ts
index 0446f35d1..f7bd207a4 100644
--- a/packages/contracts/src/utils/exchange_wrapper.ts
+++ b/packages/contracts/src/utils/exchange_wrapper.ts
@@ -1,4 +1,4 @@
-import { Provider, SignedOrder, TransactionReceiptWithDecodedLogs } from '@0xproject/types';
+import { AssetProxyId, Provider, SignedOrder, TransactionReceiptWithDecodedLogs } from '@0xproject/types';
 import { BigNumber } from '@0xproject/utils';
 import { Web3Wrapper } from '@0xproject/web3-wrapper';
 import * as _ from 'lodash';
@@ -9,7 +9,7 @@ import { constants } from './constants';
 import { formatters } from './formatters';
 import { logDecoder } from './log_decoder';
 import { orderUtils } from './order_utils';
-import { AssetProxyId, OrderInfo, SignedTransaction } from './types';
+import { OrderInfo, SignedTransaction } from './types';
 
 export class ExchangeWrapper {
     private _exchange: ExchangeContract;
diff --git a/packages/contracts/src/utils/match_order_tester.ts b/packages/contracts/src/utils/match_order_tester.ts
index 87399b9f6..85348b14d 100644
--- a/packages/contracts/src/utils/match_order_tester.ts
+++ b/packages/contracts/src/utils/match_order_tester.ts
@@ -1,5 +1,6 @@
 import { BlockchainLifecycle } from '@0xproject/dev-utils';
-import { LogWithDecodedArgs, SignedOrder } from '@0xproject/types';
+import { assetProxyUtils, crypto, orderHashUtils } from '@0xproject/order-utils';
+import { AssetProxyId, LogWithDecodedArgs, SignedOrder } from '@0xproject/types';
 import { BigNumber } from '@0xproject/utils';
 import * as chai from 'chai';
 import ethUtil = require('ethereumjs-util');
@@ -14,17 +15,13 @@ import {
     ExchangeContract,
     FillContractEventArgs,
 } from '../contract_wrappers/generated/exchange';
-import { assetProxyUtils } from '../utils/asset_proxy_utils';
 import { chaiSetup } from '../utils/chai_setup';
 import { constants } from '../utils/constants';
-import { crypto } from '../utils/crypto';
 import { ERC20Wrapper } from '../utils/erc20_wrapper';
 import { ERC721Wrapper } from '../utils/erc721_wrapper';
 import { ExchangeWrapper } from '../utils/exchange_wrapper';
 import { OrderFactory } from '../utils/order_factory';
-import { orderUtils } from '../utils/order_utils';
 import {
-    AssetProxyId,
     ContractName,
     ERC20BalancesByOwner,
     ERC721TokenIdsByOwner,
@@ -122,7 +119,7 @@ export class MatchOrderTester {
         const feeRecipientAddressRight = signedOrderRight.feeRecipientAddress;
         // Verify Left order preconditions
         const orderTakerAssetFilledAmountLeft = await this._exchangeWrapper.getTakerAssetFilledAmountAsync(
-            orderUtils.getOrderHashHex(signedOrderLeft),
+            orderHashUtils.getOrderHashHex(signedOrderLeft),
         );
         const expectedOrderFilledAmountLeft = initialTakerAssetFilledAmountLeft
             ? initialTakerAssetFilledAmountLeft
@@ -130,7 +127,7 @@ export class MatchOrderTester {
         expect(expectedOrderFilledAmountLeft).to.be.bignumber.equal(orderTakerAssetFilledAmountLeft);
         // Verify Right order preconditions
         const orderTakerAssetFilledAmountRight = await this._exchangeWrapper.getTakerAssetFilledAmountAsync(
-            orderUtils.getOrderHashHex(signedOrderRight),
+            orderHashUtils.getOrderHashHex(signedOrderRight),
         );
         const expectedOrderFilledAmountRight = initialTakerAssetFilledAmountRight
             ? initialTakerAssetFilledAmountRight
@@ -181,7 +178,7 @@ export class MatchOrderTester {
         orderTakerAssetFilledAmountRight: BigNumber,
     ): Promise<TransferAmounts> {
         let amountBoughtByLeftMaker = await this._exchangeWrapper.getTakerAssetFilledAmountAsync(
-            orderUtils.getOrderHashHex(signedOrderLeft),
+            orderHashUtils.getOrderHashHex(signedOrderLeft),
         );
         amountBoughtByLeftMaker = amountBoughtByLeftMaker.minus(orderTakerAssetFilledAmountLeft);
         const amountSoldByLeftMaker = amountBoughtByLeftMaker
@@ -192,7 +189,7 @@ export class MatchOrderTester {
             .dividedToIntegerBy(signedOrderRight.makerAssetAmount);
         const amountReceivedByTaker = amountSoldByLeftMaker.minus(amountReceivedByRightMaker);
         let amountBoughtByRightMaker = await this._exchangeWrapper.getTakerAssetFilledAmountAsync(
-            orderUtils.getOrderHashHex(signedOrderRight),
+            orderHashUtils.getOrderHashHex(signedOrderRight),
         );
         amountBoughtByRightMaker = amountBoughtByRightMaker.minus(orderTakerAssetFilledAmountRight);
         const amountSoldByRightMaker = amountBoughtByRightMaker
diff --git a/packages/contracts/src/utils/order_factory.ts b/packages/contracts/src/utils/order_factory.ts
index f704c26ec..59fc663f4 100644
--- a/packages/contracts/src/utils/order_factory.ts
+++ b/packages/contracts/src/utils/order_factory.ts
@@ -1,22 +1,21 @@
 import { generatePseudoRandomSalt } from '@0xproject/order-utils';
-import { SignedOrder, UnsignedOrder } from '@0xproject/types';
+import { orderHashUtils } from '@0xproject/order-utils';
+import { Order, SignatureType, SignedOrder } from '@0xproject/types';
 import { BigNumber } from '@0xproject/utils';
 import * as _ from 'lodash';
 
 import { constants } from './constants';
-import { orderUtils } from './order_utils';
 import { signingUtils } from './signing_utils';
-import { SignatureType } from './types';
 
 export class OrderFactory {
-    private _defaultOrderParams: Partial<UnsignedOrder>;
+    private _defaultOrderParams: Partial<Order>;
     private _privateKey: Buffer;
-    constructor(privateKey: Buffer, defaultOrderParams: Partial<UnsignedOrder>) {
+    constructor(privateKey: Buffer, defaultOrderParams: Partial<Order>) {
         this._defaultOrderParams = defaultOrderParams;
         this._privateKey = privateKey;
     }
     public newSignedOrder(
-        customOrderParams: Partial<UnsignedOrder> = {},
+        customOrderParams: Partial<Order> = {},
         signatureType: SignatureType = SignatureType.Ecrecover,
     ): SignedOrder {
         const randomExpiration = new BigNumber(Math.floor((Date.now() + Math.random() * 100000000000) / 1000));
@@ -27,8 +26,8 @@ export class OrderFactory {
             takerAddress: constants.NULL_ADDRESS,
             ...this._defaultOrderParams,
             ...customOrderParams,
-        } as any) as UnsignedOrder;
-        const orderHashBuff = orderUtils.getOrderHashBuff(order);
+        } as any) as Order;
+        const orderHashBuff = orderHashUtils.getOrderHashBuff(order);
         const signature = signingUtils.signMessage(orderHashBuff, this._privateKey, signatureType);
         const signedOrder = {
             ...order,
diff --git a/packages/contracts/src/utils/order_utils.ts b/packages/contracts/src/utils/order_utils.ts
index 6d1aaa06b..dd7a04cb6 100644
--- a/packages/contracts/src/utils/order_utils.ts
+++ b/packages/contracts/src/utils/order_utils.ts
@@ -1,8 +1,7 @@
-import { Order, SignedOrder, UnsignedOrder } from '@0xproject/types';
+import { Order, SignedOrder } from '@0xproject/types';
 import { BigNumber } from '@0xproject/utils';
 import ethUtil = require('ethereumjs-util');
 
-import { crypto } from './crypto';
 import { CancelOrder, MatchOrder } from './types';
 
 export const orderUtils = {
@@ -21,6 +20,9 @@ export const orderUtils = {
         };
         return cancel;
     },
+    // TODO: This seems redundant... it currently returns a deep copy w/o signature.
+    // Question: Should we still have a separate OrderStruct type that simply doesn't
+    // include the exchangeAddress? Seems like we need to for batch ops...
     getOrderStruct(signedOrder: SignedOrder): Order {
         const orderStruct = {
             senderAddress: signedOrder.senderAddress,
@@ -35,74 +37,10 @@ export const orderUtils = {
             salt: signedOrder.salt,
             makerAssetData: signedOrder.makerAssetData,
             takerAssetData: signedOrder.takerAssetData,
+            exchangeAddress: signedOrder.exchangeAddress,
         };
         return orderStruct;
     },
-    getDomainSeparatorSchemaHex(): string {
-        const domainSeparatorSchemaHashBuff = crypto.solSHA3(['DomainSeparator(address contract)']);
-        const schemaHashHex = `0x${domainSeparatorSchemaHashBuff.toString('hex')}`;
-        return schemaHashHex;
-    },
-    getDomainSeparatorHashHex(exchangeAddress: string): string {
-        const domainSeparatorHashBuff = crypto.solSHA3([exchangeAddress]);
-        const domainSeparatorHashHex = `0x${domainSeparatorHashBuff.toString('hex')}`;
-        return domainSeparatorHashHex;
-    },
-    getOrderSchemaHex(): string {
-        const orderSchemaHashBuff = crypto.solSHA3([
-            'Order(',
-            '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 schemaHashHex = `0x${orderSchemaHashBuff.toString('hex')}`;
-        return schemaHashHex;
-    },
-    getOrderHashBuff(order: SignedOrder | UnsignedOrder): Buffer {
-        const makerAssetDataHash = crypto.solSHA3([ethUtil.toBuffer(order.makerAssetData)]);
-        const takerAssetDataHash = crypto.solSHA3([ethUtil.toBuffer(order.takerAssetData)]);
-
-        const orderParamsHashBuff = crypto.solSHA3([
-            order.makerAddress,
-            order.takerAddress,
-            order.feeRecipientAddress,
-            order.senderAddress,
-            order.makerAssetAmount,
-            order.takerAssetAmount,
-            order.makerFee,
-            order.takerFee,
-            order.expirationTimeSeconds,
-            order.salt,
-            makerAssetDataHash,
-            takerAssetDataHash,
-        ]);
-        const orderParamsHashHex = `0x${orderParamsHashBuff.toString('hex')}`;
-        const orderSchemaHashHex = orderUtils.getOrderSchemaHex();
-        const domainSeparatorHashHex = this.getDomainSeparatorHashHex(order.exchangeAddress);
-        const domainSeparatorSchemaHex = this.getDomainSeparatorSchemaHex();
-        const orderHashBuff = crypto.solSHA3([
-            new BigNumber(domainSeparatorSchemaHex),
-            new BigNumber(domainSeparatorHashHex),
-            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;
-    },
     createMatchOrders(signedOrderLeft: SignedOrder, signedOrderRight: SignedOrder): MatchOrder {
         const fill = {
             left: orderUtils.getOrderStruct(signedOrderLeft),
diff --git a/packages/contracts/src/utils/signing_utils.ts b/packages/contracts/src/utils/signing_utils.ts
index 61ab1f138..41d63832e 100644
--- a/packages/contracts/src/utils/signing_utils.ts
+++ b/packages/contracts/src/utils/signing_utils.ts
@@ -1,7 +1,6 @@
+import { SignatureType } from '@0xproject/types';
 import * as ethUtil from 'ethereumjs-util';
 
-import { SignatureType } from './types';
-
 export const signingUtils = {
     signMessage(message: Buffer, privateKey: Buffer, signatureType: SignatureType): Buffer {
         if (signatureType === SignatureType.Ecrecover) {
diff --git a/packages/contracts/src/utils/transaction_factory.ts b/packages/contracts/src/utils/transaction_factory.ts
index 941bff96d..41907132a 100644
--- a/packages/contracts/src/utils/transaction_factory.ts
+++ b/packages/contracts/src/utils/transaction_factory.ts
@@ -1,10 +1,10 @@
-import { generatePseudoRandomSalt } from '@0xproject/order-utils';
+import { crypto, generatePseudoRandomSalt } from '@0xproject/order-utils';
+import { SignatureType } from '@0xproject/types';
 import { BigNumber } from '@0xproject/utils';
 import * as ethUtil from 'ethereumjs-util';
 
-import { crypto } from './crypto';
 import { signingUtils } from './signing_utils';
-import { SignatureType, SignedTransaction } from './types';
+import { SignedTransaction } from './types';
 
 export class TransactionFactory {
     private _signer: string;
diff --git a/packages/contracts/src/utils/types.ts b/packages/contracts/src/utils/types.ts
index 90f90ec27..e4401bd92 100644
--- a/packages/contracts/src/utils/types.ts
+++ b/packages/contracts/src/utils/types.ts
@@ -43,12 +43,6 @@ export interface CancelOrdersBefore {
     salt: BigNumber;
 }
 
-export enum AssetProxyId {
-    INVALID,
-    ERC20,
-    ERC721,
-}
-
 export interface TransactionDataParams {
     name: string;
     abi: AbiDefinition[];
@@ -113,16 +107,6 @@ export enum ContractName {
     Authorizable = 'Authorizable',
 }
 
-export enum SignatureType {
-    Illegal,
-    Invalid,
-    Caller,
-    Ecrecover,
-    EIP712,
-    Trezor,
-    Contract,
-}
-
 export interface SignedTransaction {
     exchangeAddress: string;
     salt: BigNumber;
@@ -158,23 +142,6 @@ export interface OrderInfo {
     orderTakerAssetFilledAmount: BigNumber;
 }
 
-export interface ERC20ProxyData {
-    assetProxyId: AssetProxyId;
-    tokenAddress: string;
-}
-
-export interface ERC721ProxyData {
-    assetProxyId: AssetProxyId;
-    tokenAddress: string;
-    tokenId: BigNumber;
-}
-
-export interface ProxyData {
-    assetProxyId: AssetProxyId;
-    tokenAddress?: string;
-    data?: any;
-}
-
 export interface CancelOrder {
     order: Order;
     takerAssetCancelAmount: BigNumber;