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diff --git a/contracts/extensions/contracts/Forwarder/MixinForwarderCore.sol b/contracts/extensions/contracts/Forwarder/MixinForwarderCore.sol
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--- a/contracts/extensions/contracts/Forwarder/MixinForwarderCore.sol
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-/*
-
- Copyright 2018 ZeroEx Intl.
-
- Licensed under the Apache License, Version 2.0 (the "License");
- you may not use this file except in compliance with the License.
- You may obtain a copy of the License at
-
- http://www.apache.org/licenses/LICENSE-2.0
-
- Unless required by applicable law or agreed to in writing, software
- distributed under the License is distributed on an "AS IS" BASIS,
- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- See the License for the specific language governing permissions and
- limitations under the License.
-
-*/
-
-pragma solidity ^0.4.24;
-pragma experimental ABIEncoderV2;
-
-import "./libs/LibConstants.sol";
-import "./mixins/MWeth.sol";
-import "./mixins/MAssets.sol";
-import "./mixins/MExchangeWrapper.sol";
-import "./interfaces/IForwarderCore.sol";
-import "@0x/contracts-utils/contracts/utils/LibBytes/LibBytes.sol";
-import "@0x/contracts-libs/contracts/libs/LibOrder.sol";
-import "@0x/contracts-libs/contracts/libs/LibFillResults.sol";
-import "@0x/contracts-libs/contracts/libs/LibMath.sol";
-
-
-contract MixinForwarderCore is
- LibFillResults,
- LibMath,
- LibConstants,
- MWeth,
- MAssets,
- MExchangeWrapper,
- IForwarderCore
-{
- using LibBytes for bytes;
-
- /// @dev Constructor approves ERC20 proxy to transfer ZRX and WETH on this contract's behalf.
- constructor ()
- public
- {
- address proxyAddress = EXCHANGE.getAssetProxy(ERC20_DATA_ID);
- require(
- proxyAddress != address(0),
- "UNREGISTERED_ASSET_PROXY"
- );
- ETHER_TOKEN.approve(proxyAddress, MAX_UINT);
- ZRX_TOKEN.approve(proxyAddress, MAX_UINT);
- }
-
- /// @dev Purchases as much of orders' makerAssets as possible by selling up to 95% of transaction's ETH value.
- /// Any ZRX required to pay fees for primary orders will automatically be purchased by this contract.
- /// 5% of ETH value is reserved for paying fees to order feeRecipients (in ZRX) and forwarding contract feeRecipient (in ETH).
- /// Any ETH not spent will be refunded to sender.
- /// @param orders Array of order specifications used containing desired makerAsset and WETH as takerAsset.
- /// @param signatures Proofs that orders have been created by makers.
- /// @param feeOrders Array of order specifications containing ZRX as makerAsset and WETH as takerAsset. Used to purchase ZRX for primary order fees.
- /// @param feeSignatures Proofs that feeOrders have been created by makers.
- /// @param feePercentage Percentage of WETH sold that will payed as fee to forwarding contract feeRecipient.
- /// @param feeRecipient Address that will receive ETH when orders are filled.
- /// @return Amounts filled and fees paid by maker and taker for both sets of orders.
- function marketSellOrdersWithEth(
- LibOrder.Order[] memory orders,
- bytes[] memory signatures,
- LibOrder.Order[] memory feeOrders,
- bytes[] memory feeSignatures,
- uint256 feePercentage,
- address feeRecipient
- )
- public
- payable
- returns (
- FillResults memory orderFillResults,
- FillResults memory feeOrderFillResults
- )
- {
- // Convert ETH to WETH.
- convertEthToWeth();
-
- uint256 wethSellAmount;
- uint256 zrxBuyAmount;
- uint256 makerAssetAmountPurchased;
- if (orders[0].makerAssetData.equals(ZRX_ASSET_DATA)) {
- // Calculate amount of WETH that won't be spent on ETH fees.
- wethSellAmount = getPartialAmountFloor(
- PERCENTAGE_DENOMINATOR,
- safeAdd(PERCENTAGE_DENOMINATOR, feePercentage),
- msg.value
- );
- // Market sell available WETH.
- // ZRX fees are paid with this contract's balance.
- orderFillResults = marketSellWeth(
- orders,
- wethSellAmount,
- signatures
- );
- // The fee amount must be deducted from the amount transfered back to sender.
- makerAssetAmountPurchased = safeSub(orderFillResults.makerAssetFilledAmount, orderFillResults.takerFeePaid);
- } else {
- // 5% of WETH is reserved for filling feeOrders and paying feeRecipient.
- wethSellAmount = getPartialAmountFloor(
- MAX_WETH_FILL_PERCENTAGE,
- PERCENTAGE_DENOMINATOR,
- msg.value
- );
- // Market sell 95% of WETH.
- // ZRX fees are payed with this contract's balance.
- orderFillResults = marketSellWeth(
- orders,
- wethSellAmount,
- signatures
- );
- // Buy back all ZRX spent on fees.
- zrxBuyAmount = orderFillResults.takerFeePaid;
- feeOrderFillResults = marketBuyExactZrxWithWeth(
- feeOrders,
- zrxBuyAmount,
- feeSignatures
- );
- makerAssetAmountPurchased = orderFillResults.makerAssetFilledAmount;
- }
-
- // Transfer feePercentage of total ETH spent on primary orders to feeRecipient.
- // Refund remaining ETH to msg.sender.
- transferEthFeeAndRefund(
- orderFillResults.takerAssetFilledAmount,
- feeOrderFillResults.takerAssetFilledAmount,
- feePercentage,
- feeRecipient
- );
-
- // Transfer purchased assets to msg.sender.
- transferAssetToSender(orders[0].makerAssetData, makerAssetAmountPurchased);
- }
-
- /// @dev Attempt to purchase makerAssetFillAmount of makerAsset by selling ETH provided with transaction.
- /// Any ZRX required to pay fees for primary orders will automatically be purchased by this contract.
- /// Any ETH not spent will be refunded to sender.
- /// @param orders Array of order specifications used containing desired makerAsset and WETH as takerAsset.
- /// @param makerAssetFillAmount Desired amount of makerAsset to purchase.
- /// @param signatures Proofs that orders have been created by makers.
- /// @param feeOrders Array of order specifications containing ZRX as makerAsset and WETH as takerAsset. Used to purchase ZRX for primary order fees.
- /// @param feeSignatures Proofs that feeOrders have been created by makers.
- /// @param feePercentage Percentage of WETH sold that will payed as fee to forwarding contract feeRecipient.
- /// @param feeRecipient Address that will receive ETH when orders are filled.
- /// @return Amounts filled and fees paid by maker and taker for both sets of orders.
- function marketBuyOrdersWithEth(
- LibOrder.Order[] memory orders,
- uint256 makerAssetFillAmount,
- bytes[] memory signatures,
- LibOrder.Order[] memory feeOrders,
- bytes[] memory feeSignatures,
- uint256 feePercentage,
- address feeRecipient
- )
- public
- payable
- returns (
- FillResults memory orderFillResults,
- FillResults memory feeOrderFillResults
- )
- {
- // Convert ETH to WETH.
- convertEthToWeth();
-
- uint256 zrxBuyAmount;
- uint256 makerAssetAmountPurchased;
- if (orders[0].makerAssetData.equals(ZRX_ASSET_DATA)) {
- // If the makerAsset is ZRX, it is not necessary to pay fees out of this
- // contracts's ZRX balance because fees are factored into the price of the order.
- orderFillResults = marketBuyExactZrxWithWeth(
- orders,
- makerAssetFillAmount,
- signatures
- );
- // The fee amount must be deducted from the amount transfered back to sender.
- makerAssetAmountPurchased = safeSub(orderFillResults.makerAssetFilledAmount, orderFillResults.takerFeePaid);
- } else {
- // Attemp to purchase desired amount of makerAsset.
- // ZRX fees are payed with this contract's balance.
- orderFillResults = marketBuyExactAmountWithWeth(
- orders,
- makerAssetFillAmount,
- signatures
- );
- // Buy back all ZRX spent on fees.
- zrxBuyAmount = orderFillResults.takerFeePaid;
- feeOrderFillResults = marketBuyExactZrxWithWeth(
- feeOrders,
- zrxBuyAmount,
- feeSignatures
- );
- makerAssetAmountPurchased = orderFillResults.makerAssetFilledAmount;
- }
-
- // Transfer feePercentage of total ETH spent on primary orders to feeRecipient.
- // Refund remaining ETH to msg.sender.
- transferEthFeeAndRefund(
- orderFillResults.takerAssetFilledAmount,
- feeOrderFillResults.takerAssetFilledAmount,
- feePercentage,
- feeRecipient
- );
-
- // Transfer purchased assets to msg.sender.
- transferAssetToSender(orders[0].makerAssetData, makerAssetAmountPurchased);
- }
-}
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