39 lines
1.5 KiB
TypeScript
39 lines
1.5 KiB
TypeScript
import { SignedZeroExTransaction } from '@0x/types';
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import { BigNumber } from '@0x/utils';
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import * as ethUtil from 'ethereumjs-util';
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import { CoordinatorSignatureType, hashUtils, SignedCoordinatorApproval, signingUtils } from './index';
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export class ApprovalFactory {
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private readonly _privateKey: Buffer;
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private readonly _verifyingContractAddress: string;
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constructor(privateKey: Buffer, verifyingContractAddress: string) {
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this._privateKey = privateKey;
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this._verifyingContractAddress = verifyingContractAddress;
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}
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public newSignedApproval(
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transaction: SignedZeroExTransaction,
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txOrigin: string,
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approvalExpirationTimeSeconds: BigNumber,
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signatureType: CoordinatorSignatureType = CoordinatorSignatureType.EthSign,
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): SignedCoordinatorApproval {
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const coordinatorTransaction = {
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...transaction,
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verifyingContractAddress: this._verifyingContractAddress,
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};
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const approvalHashBuff = hashUtils.getApprovalHashBuffer(
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coordinatorTransaction,
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txOrigin,
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approvalExpirationTimeSeconds,
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);
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const signatureBuff = signingUtils.signMessage(approvalHashBuff, this._privateKey, signatureType);
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const signedApproval = {
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txOrigin,
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transaction: coordinatorTransaction,
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approvalExpirationTimeSeconds,
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signature: ethUtil.addHexPrefix(signatureBuff.toString('hex')),
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};
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return signedApproval;
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}
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}
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