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import { Order, SignedOrder, UnsignedOrder } 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 = {
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): CancelOrder {
const cancel = {
order: orderUtils.getOrderStruct(signedOrder),
takerAssetCancelAmount: takerAssetCancelAmount || signedOrder.takerAssetAmount,
};
return cancel;
},
getOrderStruct(signedOrder: SignedOrder): Order {
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;
},
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),
right: orderUtils.getOrderStruct(signedOrderRight),
leftSignature: signedOrderLeft.signature,
rightSignature: signedOrderRight.signature,
};
return fill;
},
};
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