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import { ECSignature, 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 { orderHashUtils } from './order_hash';
import { generatePseudoRandomSalt } from './salt';
import { signatureUtils } from './signature_utils';
import { MessagePrefixType } from './types';
export const orderFactory = {
async createSignedOrderAsync(
provider: Provider,
makerAddress: string,
takerAddress: string,
senderAddress: string,
makerFee: BigNumber,
takerFee: BigNumber,
makerAssetAmount: BigNumber,
makerAssetData: string,
takerAssetAmount: BigNumber,
takerAssetData: string,
exchangeAddress: string,
feeRecipientAddress: string,
expirationTimeSecondsIfExists?: BigNumber,
): Promise<SignedOrder> {
const defaultExpirationUnixTimestampSec = new BigNumber(2524604400); // Close to infinite
const expirationTimeSeconds = _.isUndefined(expirationTimeSecondsIfExists)
? defaultExpirationUnixTimestampSec
: expirationTimeSecondsIfExists;
const order = {
makerAddress,
takerAddress,
senderAddress,
makerFee,
takerFee,
makerAssetAmount,
takerAssetAmount,
makerAssetData,
takerAssetData,
salt: generatePseudoRandomSalt(),
exchangeAddress,
feeRecipientAddress,
expirationTimeSeconds,
};
const orderHash = orderHashUtils.getOrderHashHex(order);
const messagePrefixOpts = {
prefixType: MessagePrefixType.EthSign,
shouldAddPrefixBeforeCallingEthSign: false,
};
const ecSignature = await signatureUtils.ecSignOrderHashAsync(
provider,
orderHash,
makerAddress,
messagePrefixOpts,
);
const signature = getVRSHexString(ecSignature);
const signedOrder: SignedOrder = _.assign(order, { signature });
return signedOrder;
},
};
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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