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