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+import { schemas } from '@0xproject/json-schemas';
+import { EIP712Schema, EIP712Types, EIP712Utils } from '@0xproject/order-utils';
+import { Order, SignedOrder } from '@0xproject/types';
+import { BigNumber } from '@0xproject/utils';
+import _ = require('lodash');
+
+import { ExchangeContract } from '../contract_wrappers/generated/exchange';
+
+import { assert } from './assert';
+
+const EIP712_ZEROEX_TRANSACTION_SCHEMA: EIP712Schema = {
+ name: 'ZeroExTransaction',
+ parameters: [
+ { name: 'salt', type: EIP712Types.Uint256 },
+ { name: 'signerAddress', type: EIP712Types.Address },
+ { name: 'data', type: EIP712Types.Bytes },
+ ],
+};
+
+/**
+ * Transaction Encoder. Transaction messages exist for the purpose of calling methods on the Exchange contract
+ * in the context of another address. For example, UserA can encode and sign a fillOrder transaction and UserB
+ * can submit this to the blockchain. The Exchange context executes as if UserA had directly submitted this transaction.
+ */
+export class TransactionEncoder {
+ private _exchangeInstance: ExchangeContract;
+ constructor(exchangeInstance: ExchangeContract) {
+ this._exchangeInstance = exchangeInstance;
+ }
+ /**
+ * Encodes the transaction data for use with the Exchange contract.
+ * @param data The ABI Encoded 0x Exchange method. I.e fillOrder
+ * @param salt A random value to provide uniqueness and prevent replay attacks.
+ * @param signerAddress The address which will sign this transaction.
+ * @return An unsigned hex encoded transaction for use in 0x Exchange executeTransaction.
+ */
+ public getTransactionHex(data: string, salt: BigNumber, signerAddress: string): string {
+ const exchangeAddress = this._getExchangeContract().address;
+ const executeTransactionData = {
+ salt,
+ signerAddress,
+ data,
+ };
+ const executeTransactionHashBuff = EIP712Utils.structHash(
+ EIP712_ZEROEX_TRANSACTION_SCHEMA,
+ executeTransactionData,
+ );
+ const eip721MessageBuffer = EIP712Utils.createEIP712Message(executeTransactionHashBuff, exchangeAddress);
+ const messageHex = `0x${eip721MessageBuffer.toString('hex')}`;
+ return messageHex;
+ }
+ /**
+ * Encodes a fillOrder transaction.
+ * @param signedOrder An object that conforms to the SignedOrder interface.
+ * @param takerAssetFillAmount The amount of the order (in taker asset baseUnits) that you wish to fill.
+ * @return Hex encoded abi of the function call.
+ */
+ public fillOrderTx(signedOrder: SignedOrder, takerAssetFillAmount: BigNumber): string {
+ assert.doesConformToSchema('signedOrder', signedOrder, schemas.signedOrderSchema);
+ assert.isValidBaseUnitAmount('takerAssetFillAmount', takerAssetFillAmount);
+ const abiEncodedData = this._getExchangeContract().fillOrder.getABIEncodedTransactionData(
+ signedOrder,
+ takerAssetFillAmount,
+ signedOrder.signature,
+ );
+ return abiEncodedData;
+ }
+ /**
+ * Encodes a fillOrderNoThrow transaction.
+ * @param signedOrder An object that conforms to the SignedOrder interface.
+ * @param takerAssetFillAmount The amount of the order (in taker asset baseUnits) that you wish to fill.
+ * @return Hex encoded abi of the function call.
+ */
+ public fillOrderNoThrowTx(signedOrder: SignedOrder, takerAssetFillAmount: BigNumber): string {
+ assert.doesConformToSchema('signedOrder', signedOrder, schemas.signedOrderSchema);
+ assert.isValidBaseUnitAmount('takerAssetFillAmount', takerAssetFillAmount);
+ const abiEncodedData = this._getExchangeContract().fillOrderNoThrow.getABIEncodedTransactionData(
+ signedOrder,
+ takerAssetFillAmount,
+ signedOrder.signature,
+ );
+ return abiEncodedData;
+ }
+ /**
+ * Encodes a fillOrKillOrder transaction.
+ * @param signedOrder An object that conforms to the SignedOrder interface.
+ * @param takerAssetFillAmount The amount of the order (in taker asset baseUnits) that you wish to fill.
+ * @return Hex encoded abi of the function call.
+ */
+ public fillOrKillOrderTx(signedOrder: SignedOrder, takerAssetFillAmount: BigNumber): string {
+ assert.doesConformToSchema('signedOrder', signedOrder, schemas.signedOrderSchema);
+ assert.isValidBaseUnitAmount('takerAssetFillAmount', takerAssetFillAmount);
+ const abiEncodedData = this._getExchangeContract().fillOrKillOrder.getABIEncodedTransactionData(
+ signedOrder,
+ takerAssetFillAmount,
+ signedOrder.signature,
+ );
+ return abiEncodedData;
+ }
+ /**
+ * Encodes a batchFillOrders transaction.
+ * @param signedOrders An array of signed orders to fill.
+ * @param takerAssetFillAmounts The amounts of the orders (in taker asset baseUnits) that you wish to fill.
+ * @return Hex encoded abi of the function call.
+ */
+ public batchFillOrdersTx(signedOrders: SignedOrder[], takerAssetFillAmounts: BigNumber[]): string {
+ assert.doesConformToSchema('signedOrders', signedOrders, schemas.signedOrdersSchema);
+ _.forEach(takerAssetFillAmounts, takerAssetFillAmount =>
+ assert.isBigNumber('takerAssetFillAmount', takerAssetFillAmount),
+ );
+ const signatures = _.map(signedOrders, signedOrder => signedOrder.signature);
+ const abiEncodedData = this._getExchangeContract().batchFillOrders.getABIEncodedTransactionData(
+ signedOrders,
+ takerAssetFillAmounts,
+ signatures,
+ );
+ return abiEncodedData;
+ }
+ /**
+ * Encodes a batchFillOrKillOrders transaction.
+ * @param signedOrders An array of signed orders to fill.
+ * @param takerAssetFillAmounts The amounts of the orders (in taker asset baseUnits) that you wish to fill.
+ * @return Hex encoded abi of the function call.
+ */
+ public batchFillOrKillOrdersTx(signedOrders: SignedOrder[], takerAssetFillAmounts: BigNumber[]): string {
+ assert.doesConformToSchema('signedOrders', signedOrders, schemas.signedOrdersSchema);
+ _.forEach(takerAssetFillAmounts, takerAssetFillAmount =>
+ assert.isBigNumber('takerAssetFillAmount', takerAssetFillAmount),
+ );
+ const signatures = _.map(signedOrders, signedOrder => signedOrder.signature);
+ const abiEncodedData = this._getExchangeContract().batchFillOrKillOrders.getABIEncodedTransactionData(
+ signedOrders,
+ takerAssetFillAmounts,
+ signatures,
+ );
+ return abiEncodedData;
+ }
+ /**
+ * Encodes a batchFillOrdersNoThrow transaction.
+ * @param signedOrders An array of signed orders to fill.
+ * @param takerAssetFillAmounts The amounts of the orders (in taker asset baseUnits) that you wish to fill.
+ * @return Hex encoded abi of the function call.
+ */
+ public batchFillOrdersNoThrowTx(signedOrders: SignedOrder[], takerAssetFillAmounts: BigNumber[]): string {
+ assert.doesConformToSchema('signedOrders', signedOrders, schemas.signedOrdersSchema);
+ _.forEach(takerAssetFillAmounts, takerAssetFillAmount =>
+ assert.isBigNumber('takerAssetFillAmount', takerAssetFillAmount),
+ );
+ const signatures = _.map(signedOrders, signedOrder => signedOrder.signature);
+ const abiEncodedData = this._getExchangeContract().batchFillOrdersNoThrow.getABIEncodedTransactionData(
+ signedOrders,
+ takerAssetFillAmounts,
+ signatures,
+ );
+ return abiEncodedData;
+ }
+ /**
+ * Encodes a batchCancelOrders transaction.
+ * @param signedOrders An array of orders to cancel.
+ * @return Hex encoded abi of the function call.
+ */
+ public batchCancelOrdersTx(signedOrders: SignedOrder[]): string {
+ assert.doesConformToSchema('signedOrders', signedOrders, schemas.signedOrdersSchema);
+ const abiEncodedData = this._getExchangeContract().batchCancelOrders.getABIEncodedTransactionData(signedOrders);
+ return abiEncodedData;
+ }
+ /**
+ * Encodes a cancelOrdersUpTo transaction.
+ * @param targetOrderEpoch Target order epoch.
+ * @return Hex encoded abi of the function call.
+ */
+ public cancelOrdersUpToTx(targetOrderEpoch: BigNumber): string {
+ assert.isBigNumber('targetOrderEpoch', targetOrderEpoch);
+ const abiEncodedData = this._getExchangeContract().cancelOrdersUpTo.getABIEncodedTransactionData(
+ targetOrderEpoch,
+ );
+ return abiEncodedData;
+ }
+ /**
+ * Encodes a cancelOrder transaction.
+ * @param order An object that conforms to the Order or SignedOrder interface. The order you would like to cancel.
+ * @return Hex encoded abi of the function call.
+ */
+ public cancelOrderTx(order: Order | SignedOrder): string {
+ assert.doesConformToSchema('order', order, schemas.orderSchema);
+ const abiEncodedData = this._getExchangeContract().cancelOrder.getABIEncodedTransactionData(order);
+ return abiEncodedData;
+ }
+ /**
+ * Encodes a marketSellOrders transaction.
+ * @param signedOrders An array of signed orders to fill.
+ * @param takerAssetFillAmount Taker asset fill amount.
+ * @return Hex encoded abi of the function call.
+ */
+ public marketSellOrdersTx(signedOrders: SignedOrder[], takerAssetFillAmount: BigNumber): string {
+ assert.doesConformToSchema('signedOrders', signedOrders, schemas.signedOrdersSchema);
+ assert.isBigNumber('takerAssetFillAmount', takerAssetFillAmount);
+ const signatures = _.map(signedOrders, signedOrder => signedOrder.signature);
+ const abiEncodedData = this._getExchangeContract().marketSellOrders.getABIEncodedTransactionData(
+ signedOrders,
+ takerAssetFillAmount,
+ signatures,
+ );
+ return abiEncodedData;
+ }
+ /**
+ * Encodes a marketSellOrdersNoThrow transaction.
+ * @param signedOrders An array of signed orders to fill.
+ * @param takerAssetFillAmount Taker asset fill amount.
+ * @return Hex encoded abi of the function call.
+ */
+ public marketSellOrdersNoThrowTx(signedOrders: SignedOrder[], takerAssetFillAmount: BigNumber): string {
+ assert.doesConformToSchema('signedOrders', signedOrders, schemas.signedOrdersSchema);
+ assert.isBigNumber('takerAssetFillAmount', takerAssetFillAmount);
+ const signatures = _.map(signedOrders, signedOrder => signedOrder.signature);
+ const abiEncodedData = this._getExchangeContract().marketSellOrdersNoThrow.getABIEncodedTransactionData(
+ signedOrders,
+ takerAssetFillAmount,
+ signatures,
+ );
+ return abiEncodedData;
+ }
+ /**
+ * Encodes a maketBuyOrders transaction.
+ * @param signedOrders An array of signed orders to fill.
+ * @param makerAssetFillAmount Maker asset fill amount.
+ * @return Hex encoded abi of the function call.
+ */
+ public marketBuyOrdersTx(signedOrders: SignedOrder[], makerAssetFillAmount: BigNumber): string {
+ assert.doesConformToSchema('signedOrders', signedOrders, schemas.signedOrdersSchema);
+ assert.isBigNumber('makerAssetFillAmount', makerAssetFillAmount);
+ const signatures = _.map(signedOrders, signedOrder => signedOrder.signature);
+ const abiEncodedData = this._getExchangeContract().marketBuyOrders.getABIEncodedTransactionData(
+ signedOrders,
+ makerAssetFillAmount,
+ signatures,
+ );
+ return abiEncodedData;
+ }
+ /**
+ * Encodes a maketBuyOrdersNoThrow transaction.
+ * @param signedOrders An array of signed orders to fill.
+ * @param makerAssetFillAmount Maker asset fill amount.
+ * @return Hex encoded abi of the function call.
+ */
+ public marketBuyOrdersNoThrowTx(signedOrders: SignedOrder[], makerAssetFillAmount: BigNumber): string {
+ assert.doesConformToSchema('signedOrders', signedOrders, schemas.signedOrdersSchema);
+ assert.isBigNumber('makerAssetFillAmount', makerAssetFillAmount);
+ const signatures = _.map(signedOrders, signedOrder => signedOrder.signature);
+ const abiEncodedData = this._getExchangeContract().marketBuyOrdersNoThrow.getABIEncodedTransactionData(
+ signedOrders,
+ makerAssetFillAmount,
+ signatures,
+ );
+ return abiEncodedData;
+ }
+ /**
+ * Encodes a preSign transaction.
+ * @param hash Hash to pre-sign
+ * @param signerAddress Address that should have signed the given hash.
+ * @param signature Proof that the hash has been signed by signer.
+ * @return Hex encoded abi of the function call.
+ */
+ public preSignTx(hash: string, signerAddress: string, signature: string): string {
+ assert.isHexString('hash', hash);
+ assert.isETHAddressHex('signerAddress', signerAddress);
+ assert.isHexString('signature', signature);
+ const abiEncodedData = this._getExchangeContract().preSign.getABIEncodedTransactionData(
+ hash,
+ signerAddress,
+ signature,
+ );
+ return abiEncodedData;
+ }
+ /**
+ * Encodes a setSignatureValidatorApproval transaction.
+ * @param validatorAddress Validator contract address.
+ * @param isApproved Boolean value to set approval to.
+ * @return Hex encoded abi of the function call.
+ */
+ public setSignatureValidatorApprovalTx(validatorAddress: string, isApproved: boolean): string {
+ assert.isETHAddressHex('validatorAddress', validatorAddress);
+ assert.isBoolean('isApproved', isApproved);
+ const abiEncodedData = this._getExchangeContract().setSignatureValidatorApproval.getABIEncodedTransactionData(
+ validatorAddress,
+ isApproved,
+ );
+ return abiEncodedData;
+ }
+ private _getExchangeContract(): ExchangeContract {
+ return this._exchangeInstance;
+ }
+}