Merge development branch

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diff --git a/packages/contract-wrappers/src/utils/transaction_encoder.ts b/packages/contract-wrappers/src/utils/transaction_encoder.ts
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+++ b/packages/contract-wrappers/src/utils/transaction_encoder.ts
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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;
+    }
+}