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import { ECSignature, Order, SignedOrder } from '@0xproject/types';
import { BigNumber } from '@0xproject/utils';
import { Provider } from 'ethereum-types';
import * as ethUtil from 'ethereumjs-util';
import * as _ from 'lodash';
import { constants } from './constants';
import { orderHashUtils } from './order_hash';
import { generatePseudoRandomSalt } from './salt';
import { ecSignOrderHashAsync } from './signature_utils';
import { CreateOrderOpts, MessagePrefixType } from './types';
export const orderFactory = {
createOrder(
makerAddress: string,
makerAssetAmount: BigNumber,
makerAssetData: string,
takerAssetAmount: BigNumber,
takerAssetData: string,
exchangeAddress: string,
createOrderOpts: CreateOrderOpts = generateDefaultCreateOrderOpts(),
): Order {
const defaultCreateOrderOpts = generateDefaultCreateOrderOpts();
const order = {
makerAddress,
makerAssetAmount,
takerAssetAmount,
makerAssetData,
takerAssetData,
exchangeAddress,
takerAddress: createOrderOpts.takerAddress || defaultCreateOrderOpts.takerAddress,
senderAddress: createOrderOpts.senderAddress || defaultCreateOrderOpts.senderAddress,
makerFee: createOrderOpts.makerFee || defaultCreateOrderOpts.makerFee,
takerFee: createOrderOpts.takerFee || defaultCreateOrderOpts.takerFee,
feeRecipientAddress: createOrderOpts.feeRecipientAddress || defaultCreateOrderOpts.feeRecipientAddress,
salt: createOrderOpts.salt || defaultCreateOrderOpts.salt,
expirationTimeSeconds:
createOrderOpts.expirationTimeSeconds || defaultCreateOrderOpts.expirationTimeSeconds,
};
return order;
},
async createSignedOrderAsync(
provider: Provider,
makerAddress: string,
makerAssetAmount: BigNumber,
makerAssetData: string,
takerAssetAmount: BigNumber,
takerAssetData: string,
exchangeAddress: string,
createOrderOpts?: CreateOrderOpts,
): Promise<SignedOrder> {
const order = orderFactory.createOrder(
makerAddress,
makerAssetAmount,
makerAssetData,
takerAssetAmount,
takerAssetData,
exchangeAddress,
createOrderOpts,
);
const orderHash = orderHashUtils.getOrderHashHex(order);
const messagePrefixOpts = {
prefixType: MessagePrefixType.EthSign,
shouldAddPrefixBeforeCallingEthSign: false,
};
const ecSignature = await ecSignOrderHashAsync(provider, orderHash, makerAddress, messagePrefixOpts);
const signature = getVRSHexString(ecSignature);
const signedOrder: SignedOrder = _.assign(order, { signature });
return signedOrder;
},
};
function generateDefaultCreateOrderOpts(): {
takerAddress: string;
senderAddress: string;
makerFee: BigNumber;
takerFee: BigNumber;
feeRecipientAddress: string;
salt: BigNumber;
expirationTimeSeconds: BigNumber;
} {
return {
takerAddress: constants.NULL_ADDRESS,
senderAddress: constants.NULL_ADDRESS,
makerFee: constants.ZERO_AMOUNT,
takerFee: constants.ZERO_AMOUNT,
feeRecipientAddress: constants.NULL_ADDRESS,
salt: generatePseudoRandomSalt(),
expirationTimeSeconds: constants.INFINITE_TIMESTAMP_SEC,
};
}
function getVRSHexString(ecSignature: ECSignature): string {
const ETH_SIGN_SIGNATURE_TYPE = '03';
const vrs = `${intToHex(ecSignature.v)}${ethUtil.stripHexPrefix(ecSignature.r)}${ethUtil.stripHexPrefix(
ecSignature.s,
)}${ETH_SIGN_SIGNATURE_TYPE}`;
return vrs;
}
function intToHex(i: number): string {
const hex = ethUtil.bufferToHex(ethUtil.toBuffer(i));
return hex;
}
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