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Diffstat (limited to 'contracts/test-utils/src/transaction_factory.ts')
-rw-r--r-- | contracts/test-utils/src/transaction_factory.ts | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/contracts/test-utils/src/transaction_factory.ts b/contracts/test-utils/src/transaction_factory.ts new file mode 100644 index 000000000..dbab3ade4 --- /dev/null +++ b/contracts/test-utils/src/transaction_factory.ts @@ -0,0 +1,37 @@ +import { eip712Utils, generatePseudoRandomSalt } from '@0x/order-utils'; +import { SignatureType } from '@0x/types'; +import { signTypedDataUtils } from '@0x/utils'; +import * as ethUtil from 'ethereumjs-util'; + +import { signingUtils } from './signing_utils'; +import { SignedTransaction } from './types'; + +export class TransactionFactory { + private readonly _signerBuff: Buffer; + private readonly _exchangeAddress: string; + private readonly _privateKey: Buffer; + constructor(privateKey: Buffer, exchangeAddress: string) { + this._privateKey = privateKey; + this._exchangeAddress = exchangeAddress; + this._signerBuff = ethUtil.privateToAddress(this._privateKey); + } + public newSignedTransaction(data: string, signatureType: SignatureType = SignatureType.EthSign): SignedTransaction { + const salt = generatePseudoRandomSalt(); + const signerAddress = `0x${this._signerBuff.toString('hex')}`; + const executeTransactionData = { + salt, + signerAddress, + data, + }; + + const typedData = eip712Utils.createZeroExTransactionTypedData(executeTransactionData, this._exchangeAddress); + const eip712MessageBuffer = signTypedDataUtils.generateTypedDataHash(typedData); + const signature = signingUtils.signMessage(eip712MessageBuffer, this._privateKey, signatureType); + const signedTx = { + exchangeAddress: this._exchangeAddress, + signature: `0x${signature.toString('hex')}`, + ...executeTransactionData, + }; + return signedTx; + } +} |