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author | Amir Bandeali <abandeali1@gmail.com> | 2018-07-07 06:08:14 +0800 |
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committer | Amir Bandeali <abandeali1@gmail.com> | 2018-07-08 13:11:36 +0800 |
commit | 462f1f00d8151ad17f8909f2c07dbc807a0df87d (patch) | |
tree | cd4a7dece270466472d744b758047f3b3bd36510 /packages/contracts/src/2.0.0/forwarder/MixinForwarderCore.sol | |
parent | 1c80bba4ddcb01cb8e3694f86d3f81e7164b8991 (diff) | |
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Combine mixins
Diffstat (limited to 'packages/contracts/src/2.0.0/forwarder/MixinForwarderCore.sol')
-rw-r--r-- | packages/contracts/src/2.0.0/forwarder/MixinForwarderCore.sol | 416 |
1 files changed, 416 insertions, 0 deletions
diff --git a/packages/contracts/src/2.0.0/forwarder/MixinForwarderCore.sol b/packages/contracts/src/2.0.0/forwarder/MixinForwarderCore.sol new file mode 100644 index 000000000..fcc82b705 --- /dev/null +++ b/packages/contracts/src/2.0.0/forwarder/MixinForwarderCore.sol @@ -0,0 +1,416 @@ +/* + + 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 "../utils/LibBytes/LibBytes.sol"; +import "./MixinFees.sol"; +import "./MixinMarketBuyZrx.sol"; +import "./MixinExpectedResults.sol"; +import "./MixinTransfer.sol"; +import "./MixinConstants.sol"; +import "../protocol/Exchange/libs/LibOrder.sol"; + + +contract MixinForwarderCore is + MixinConstants, + MixinExpectedResults, + MixinFees, + MixinMarketBuyZrx, + MixinTransfer +{ + bytes4 public constant ERC20_DATA_ID = bytes4(keccak256("ERC20Token(address)")); + bytes4 public constant ERC721_DATA_ID = bytes4(keccak256("ERC721Token(address,uint256,bytes)")); + + /// @dev Market sells ETH for ERC20 tokens, performing fee abstraction if required. This does not support ERC721 tokens. This function is payable + /// and will convert all incoming ETH into WETH and perform the trade on behalf of the caller. + /// This function allows for a deduction of a proportion of incoming ETH sent to the feeRecipient. + /// The caller is sent all tokens from the operation. + /// If the purchased token amount does not meet an acceptable threshold then this function reverts. + /// @param orders An array of Order struct containing order specifications. + /// @param signatures An array of Proof that order has been created by maker. + /// @param feeOrders An array of Order struct containing order specifications for fees. + /// @param feeSignatures An array of Proof that order has been created by maker for the fee orders. + /// @param feeProportion A proportion deducted off the incoming ETH and sent to feeRecipient. The maximum value for this + /// is 1000, aka 10%. Supports up to 2 decimal places. I.e 0.59% is 59. + /// @param feeRecipient An address of the fee recipient whom receives feeProportion of ETH. + /// @return FillResults amounts filled and fees paid by maker and taker. + function marketSellEthForERC20( + LibOrder.Order[] memory orders, + bytes[] memory signatures, + LibOrder.Order[] memory feeOrders, + bytes[] memory feeSignatures, + uint16 feeProportion, + address feeRecipient + ) + public + payable + returns (FillResults memory totalFillResults) + { + uint256 takerEthAmount = msg.value; + require( + takerEthAmount > 0, + "VALUE_GREATER_THAN_ZERO" + ); + // Deduct the fee from the total amount of ETH sent in + uint256 ethFeeAmount = payEthFee( + takerEthAmount, + feeProportion, + feeRecipient + ); + uint256 wethSellAmount = safeSub(takerEthAmount, ethFeeAmount); + + // Deposit the remaining to be used for trading + ETHER_TOKEN.deposit.value(wethSellAmount)(); + // Populate the known assetData, as it is always WETH the caller can provide null bytes to save gas + // marketSellOrders fills the remaining + address makerTokenAddress = LibBytes.readAddress(orders[0].makerAssetData, 16); + orders[0].takerAssetData = WETH_ASSET_DATA; + if (makerTokenAddress == address(ZRX_TOKEN)) { + // If this is ZRX then we market sell from the orders, rather than a 2 step of buying ZRX fees from feeOrders + // then buying ZRX from orders + totalFillResults = marketSellEthForZRXInternal( + orders, + signatures, + wethSellAmount + ); + } else { + totalFillResults = marketSellEthForERC20Internal( + orders, + signatures, + feeOrders, + feeSignatures, + wethSellAmount + ); + } + // Prevent accidental WETH owned by this contract and it being spent + require( + takerEthAmount >= totalFillResults.takerAssetFilledAmount, + "INVALID_MSG_VALUE" + ); + // Ensure no WETH is left in this contract + require( + wethSellAmount == totalFillResults.takerAssetFilledAmount, + "UNACCEPTABLE_THRESHOLD" + ); + // Transfer all tokens to msg.sender + transferERC20Token( + makerTokenAddress, + msg.sender, + totalFillResults.makerAssetFilledAmount + ); + return totalFillResults; + } + + /// @dev Buys the exact amount of assets (ERC20 and ERC721), performing fee abstraction if required. + /// All order assets must be of the same type. Deducts a proportional fee to fee recipient. + /// This function is payable and will convert all incoming ETH into WETH and perform the trade on behalf of the caller. + /// The caller is sent all assets from the fill of orders. This function will revert unless the requested amount of assets are purchased. + /// Any excess ETH sent will be returned to the caller + /// @param orders An array of Order struct containing order specifications. + /// @param signatures An array of Proof that order has been created by maker. + /// @param feeOrders An array of Order struct containing order specifications for fees. + /// @param makerTokenFillAmount The amount of maker asset to buy. + /// @param feeSignatures An array of Proof that order has been created by maker for the fee orders. + /// @param feeProportion A proportion deducted off the ETH spent and sent to feeRecipient. The maximum value for this + /// is 1000, aka 10%. Supports up to 2 decimal places. I.e 0.59% is 59. + /// @param feeRecipient An address of the fee recipient whom receives feeProportion of ETH. + /// @return FillResults amounts filled and fees paid by maker and taker. + function marketBuyTokensWithEth( + LibOrder.Order[] memory orders, + bytes[] memory signatures, + LibOrder.Order[] memory feeOrders, + bytes[] memory feeSignatures, + uint256 makerTokenFillAmount, + uint16 feeProportion, + address feeRecipient + ) + public + payable + returns (FillResults memory totalFillResults) + { + uint256 takerEthAmount = msg.value; + require( + takerEthAmount > 0, + "VALUE_GREATER_THAN_ZERO" + ); + require( + makerTokenFillAmount > 0, + "VALUE_GREATER_THAN_ZERO" + ); + bytes4 assetDataId = LibBytes.readBytes4(orders[0].makerAssetData, 0); + require( + assetDataId == ERC20_DATA_ID || assetDataId == ERC721_DATA_ID, + "UNSUPPORTED_TOKEN_PROXY" + ); + + ETHER_TOKEN.deposit.value(takerEthAmount)(); + if (assetDataId == ERC20_DATA_ID) { + totalFillResults = marketBuyERC20TokensInternal( + orders, + signatures, + feeOrders, + feeSignatures, + makerTokenFillAmount + ); + } else if (assetDataId == ERC721_DATA_ID) { + totalFillResults = batchBuyERC721TokensInternal( + orders, + signatures, + feeOrders, + feeSignatures + ); + } + // Prevent accidental WETH owned by this contract and it being spent + require( + takerEthAmount >= totalFillResults.takerAssetFilledAmount, + "INVALID_MSG_VALUE" + ); + withdrawPayAndDeductEthFee( + safeSub(takerEthAmount, totalFillResults.takerAssetFilledAmount), + totalFillResults.takerAssetFilledAmount, + feeProportion, + feeRecipient + ); + return totalFillResults; + } + + /// @dev Market sells WETH for ERC20 tokens. + /// @param orders An array of Order struct containing order specifications. + /// @param signatures An array of Proof that order has been created by maker. + /// @param feeOrders An array of Order struct containing order specifications for fees. + /// @param feeSignatures An array of Proof that order has been created by maker for the fee orders. + /// @param wethSellAmount The amount of WETH to sell. + /// @return FillResults amounts filled and fees paid by maker and taker. + function marketSellEthForERC20Internal( + LibOrder.Order[] memory orders, + bytes[] memory signatures, + LibOrder.Order[] memory feeOrders, + bytes[] memory feeSignatures, + uint256 wethSellAmount + ) + internal + returns (FillResults memory totalFillResults) + { + uint256 remainingWethSellAmount = wethSellAmount; + FillResults memory calculatedMarketSellResults = calculateMarketSellResults(orders, wethSellAmount); + if (calculatedMarketSellResults.takerFeePaid > 0) { + // Fees are required for these orders. Buy enough ZRX to cover the future market buy + FillResults memory feeTokensResults = marketBuyZrxInternal( + feeOrders, + feeSignatures, + calculatedMarketSellResults.takerFeePaid + ); + // Ensure the token abstraction was fair if fees were proportionally too high, we fail + require( + isAcceptableThreshold( + wethSellAmount, + safeSub(wethSellAmount, feeTokensResults.takerAssetFilledAmount) + ), + "UNACCEPTABLE_THRESHOLD" + ); + remainingWethSellAmount = safeSub(remainingWethSellAmount, feeTokensResults.takerAssetFilledAmount); + totalFillResults.takerFeePaid = feeTokensResults.takerFeePaid; + totalFillResults.takerAssetFilledAmount = feeTokensResults.takerAssetFilledAmount; + } + // Make our market sell to buy the requested tokens with the remaining balance + FillResults memory requestedTokensResults = EXCHANGE.marketSellOrders( + orders, + remainingWethSellAmount, + signatures + ); + // Update our return FillResult with the market sell + addFillResults(totalFillResults, requestedTokensResults); + return totalFillResults; + } + + /// @dev Market sells WETH for ZRX tokens. + /// @param orders An array of Order struct containing order specifications. + /// @param signatures An array of Proof that order has been created by maker. + /// @param wethSellAmount The amount of WETH to sell. + /// @return FillResults amounts filled and fees paid by maker and taker. + function marketSellEthForZRXInternal( + LibOrder.Order[] memory orders, + bytes[] memory signatures, + uint256 wethSellAmount + ) + internal + returns (FillResults memory totalFillResults) + { + // Make our market sell to buy the requested tokens with the remaining balance + totalFillResults = EXCHANGE.marketSellOrders( + orders, + wethSellAmount, + signatures + ); + // Exchange does not special case ZRX in the makerAssetFilledAmount, if fees were deducted then using this amount + // for future transfers is invalid. + uint256 zrxAmountBought = safeSub(totalFillResults.makerAssetFilledAmount, totalFillResults.takerFeePaid); + require( + isAcceptableThreshold(totalFillResults.makerAssetFilledAmount, zrxAmountBought), + "UNACCEPTABLE_THRESHOLD" + ); + totalFillResults.makerAssetFilledAmount = zrxAmountBought; + return totalFillResults; + } + + /// @dev Buys an exact amount of an ERC20 token using WETH. + /// @param orders Orders to fill. The maker asset is the ERC20 token to buy. The taker asset is WETH. + /// @param signatures Proof that the orders were created by their respective makers. + /// @param feeOrders to fill. The maker asset is ZRX and the taker asset is WETH. + /// @param feeSignatures Proof that the feeOrders were created by their respective makers. + /// @param makerTokenFillAmount Amount of the ERC20 token to buy. + /// @return totalFillResults Aggregated fill results of buying the ERC20 and ZRX tokens. + function marketBuyERC20TokensInternal( + LibOrder.Order[] memory orders, + bytes[] memory signatures, + LibOrder.Order[] memory feeOrders, + bytes[] memory feeSignatures, + uint256 makerTokenFillAmount + ) + private + returns (FillResults memory totalFillResults) + { + // We read the maker token address to check if it is ZRX and later use it for transfer + address makerTokenAddress = LibBytes.readAddress(orders[0].makerAssetData, 16); + // We assume that asset being bought by taker is the same for each order. + // Rather than passing this in as calldata, we copy the makerAssetData from the first order onto all later orders. + orders[0].takerAssetData = WETH_ASSET_DATA; + // We can short cut here for effeciency and use buyFeeTokensInternal if maker asset token is ZRX + // this buys us exactly that amount taking into account the fees. This saves gas and calculates the rate correctly + FillResults memory marketBuyResults; + if (makerTokenAddress == address(ZRX_TOKEN)) { + marketBuyResults = marketBuyZrxInternal( + orders, + signatures, + makerTokenFillAmount + ); + // When buying ZRX we round up which can result in a small margin excess + require( + marketBuyResults.makerAssetFilledAmount >= makerTokenFillAmount, + "UNACCEPTABLE_THRESHOLD" + ); + addFillResults(totalFillResults, marketBuyResults); + require( + isAcceptableThreshold( + safeAdd(totalFillResults.makerAssetFilledAmount, totalFillResults.takerFeePaid), // Total ZRX + totalFillResults.makerAssetFilledAmount // amount going to msg.sender + ), + "UNACCEPTABLE_THRESHOLD" + ); + } else { + FillResults memory calculatedMarketBuyResults = calculateMarketBuyResults(orders, makerTokenFillAmount); + if (calculatedMarketBuyResults.takerFeePaid > 0) { + // Fees are required for these orders. Buy enough ZRX to cover the future market buy + FillResults memory zrxMarketBuyResults = marketBuyZrxInternal( + feeOrders, + feeSignatures, + calculatedMarketBuyResults.takerFeePaid + ); + totalFillResults.takerAssetFilledAmount = zrxMarketBuyResults.takerAssetFilledAmount; + totalFillResults.takerFeePaid = zrxMarketBuyResults.takerFeePaid; + } + // Make our market buy of the requested tokens with the remaining balance + marketBuyResults = EXCHANGE.marketBuyOrders( + orders, + makerTokenFillAmount, + signatures + ); + require( + marketBuyResults.makerAssetFilledAmount == makerTokenFillAmount, + "UNACCEPTABLE_THRESHOLD" + ); + addFillResults(totalFillResults, marketBuyResults); + require( + isAcceptableThreshold( + totalFillResults.takerAssetFilledAmount, + marketBuyResults.takerAssetFilledAmount + ), + "UNACCEPTABLE_THRESHOLD" + ); + } + // Transfer all purchased tokens to msg.sender + transferERC20Token( + makerTokenAddress, + msg.sender, + marketBuyResults.makerAssetFilledAmount + ); + return totalFillResults; + } + + /// @dev Buys an all of the ERC721 tokens in the orders. + /// @param orders Orders to fill. The maker asset is the ERC721 token to buy. The taker asset is WETH. + /// @param signatures Proof that the orders were created by their respective makers. + /// @param feeOrders to fill. The maker asset is ZRX and the taker asset is WETH. + /// @param feeSignatures Proof that the feeOrders were created by their respective makers. + /// @return totalFillResults Aggregated fill results of buying the ERC721 tokens and ZRX tokens. + function batchBuyERC721TokensInternal( + LibOrder.Order[] memory orders, + bytes[] memory signatures, + LibOrder.Order[] memory feeOrders, + bytes[] memory feeSignatures + ) + private + returns (FillResults memory totalFillResults) + { + uint256 totalZrxFeeAmount; + uint256 ordersLength = orders.length; + uint256[] memory takerAssetFillAmounts = new uint256[](ordersLength); + for (uint256 i = 0; i < ordersLength; i++) { + // Total up the fees + totalZrxFeeAmount = safeAdd(totalZrxFeeAmount, orders[i].takerFee); + // We assume that asset being bought by taker is the same for each order. + // Rather than passing this in as calldata, we set the takerAssetData as WETH asset data + orders[i].takerAssetData = WETH_ASSET_DATA; + // Populate takerAssetFillAmounts for later batchFill + takerAssetFillAmounts[i] = orders[i].takerAssetAmount; + } + if (totalZrxFeeAmount > 0) { + // Fees are required for these orders. Buy enough ZRX to cover the future fill + FillResults memory zrxMarketBuyResults = marketBuyZrxInternal( + feeOrders, + feeSignatures, + totalZrxFeeAmount + ); + totalFillResults.takerFeePaid = zrxMarketBuyResults.takerFeePaid; + totalFillResults.takerAssetFilledAmount = zrxMarketBuyResults.takerAssetFilledAmount; + } + FillResults memory batchFillResults = EXCHANGE.batchFillOrKillOrders( + orders, + takerAssetFillAmounts, + signatures + ); + addFillResults(totalFillResults, batchFillResults); + require( + isAcceptableThreshold( + totalFillResults.takerAssetFilledAmount, + batchFillResults.takerAssetFilledAmount + ), + "UNACCEPTABLE_THRESHOLD" + ); + // Transfer all of the tokens filled from the batchFill + for (i = 0; i < ordersLength; i++) { + transferERC721Token( + orders[i].makerAssetData, + msg.sender + ); + } + return totalFillResults; + } +} |