42 lines
1.7 KiB
TypeScript
42 lines
1.7 KiB
TypeScript
import { generatePseudoRandomSalt } from '@0x/order-utils';
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import { Order, SignatureType, SignedOrder } from '@0x/types';
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import { BigNumber } from '@0x/utils';
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import { getLatestBlockTimestampAsync } from './block_timestamp';
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import { constants } from './constants';
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import { orderHashUtils } from './order_hash';
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import { signingUtils } from './signing_utils';
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export class OrderFactory {
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private readonly _defaultOrderParams: Partial<Order>;
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private readonly _privateKey: Buffer;
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constructor(privateKey: Buffer, defaultOrderParams: Partial<Order>) {
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this._defaultOrderParams = defaultOrderParams;
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this._privateKey = privateKey;
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}
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public async newSignedOrderAsync(
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customOrderParams: Partial<Order> = {},
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signatureType: SignatureType = SignatureType.EthSign,
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): Promise<SignedOrder> {
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const fifteenMinutesInSeconds = 15 * 60;
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const currentBlockTimestamp = await getLatestBlockTimestampAsync();
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const order = {
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takerAddress: constants.NULL_ADDRESS,
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senderAddress: constants.NULL_ADDRESS,
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expirationTimeSeconds: new BigNumber(currentBlockTimestamp).plus(fifteenMinutesInSeconds),
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salt: generatePseudoRandomSalt(),
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...this._defaultOrderParams,
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...customOrderParams,
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} as Order; // tslint:disable-line:no-object-literal-type-assertion
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const orderHashBuff = orderHashUtils.getOrderHashBuffer(order);
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const signature = signingUtils.signMessage(orderHashBuff, this._privateKey, signatureType);
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const signedOrder = {
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...order,
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signature: `0x${signature.toString('hex')}`,
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};
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return signedOrder;
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}
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}
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