diff options
Diffstat (limited to 'packages/contracts/src/2.0.0/extensions/OrderValidator')
-rw-r--r-- | packages/contracts/src/2.0.0/extensions/OrderValidator/OrderValidator.sol | 140 |
1 files changed, 140 insertions, 0 deletions
diff --git a/packages/contracts/src/2.0.0/extensions/OrderValidator/OrderValidator.sol b/packages/contracts/src/2.0.0/extensions/OrderValidator/OrderValidator.sol new file mode 100644 index 000000000..dcbbd7fa5 --- /dev/null +++ b/packages/contracts/src/2.0.0/extensions/OrderValidator/OrderValidator.sol @@ -0,0 +1,140 @@ +/* + + 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 "../../protocol/Exchange/interfaces/IExchange.sol"; +import "../../protocol/Exchange/libs/LibOrder.sol"; +import "../../tokens/ERC20Token/IERC20Token.sol"; +import "../../tokens/ERC721Token/IERC721Token.sol"; +import "../../utils/LibBytes/LibBytes.sol"; + + +contract OrderValidator { + + bytes4 constant internal ERC20_DATA_ID = bytes4(keccak256("ERC20Token(address)")); + bytes4 constant internal ERC721_DATA_ID = bytes4(keccak256("ERC721Token(address,uint256)")); + + using LibBytes for bytes; + + struct TraderInfo { + uint256 makerBalance; // Maker's balance of makerAsset + uint256 makerAllowance; // Maker's allowance to corresponding AssetProxy + uint256 takerBalance; // Taker's balance of takerAsset + uint256 takerAllowance; // Taker's allowance to corresponding AssetProxy + } + + // Exchange contract. + // solhint-disable-next-line var-name-mixedcase + IExchange internal EXCHANGE; + + constructor (address _exchange) + public + { + EXCHANGE = IExchange(_exchange); + } + + /// @dev Fetches information for order and maker/taker of order. + /// @param order The order structure. + /// @param takerAddress Address that will be filling the order. + /// @return OrderInfo and TraderInfo instances for given order. + function getOrderAndTraderInfo(LibOrder.Order memory order, address takerAddress) + public + view + returns (LibOrder.OrderInfo memory orderInfo, TraderInfo memory traderInfo) + { + orderInfo = EXCHANGE.getOrderInfo(order); + traderInfo = getTraderInfo(order, takerAddress); + return (orderInfo, traderInfo); + } + + /// @dev Fetches information for all passed in orders and the makers/takers of each order. + /// @param orders Array of order specifications. + /// @param takerAddresses Array of taker addresses corresponding to each order. + /// @return Arrays of OrderInfo and TraderInfo instances that correspond to each order. + function getOrdersAndTradersInfo(LibOrder.Order[] memory orders, address[] memory takerAddresses) + public + view + returns (LibOrder.OrderInfo[] memory ordersInfo, TraderInfo[] memory tradersInfo) + { + ordersInfo = EXCHANGE.getOrdersInfo(orders); + tradersInfo = getTradersInfo(orders, takerAddresses); + return (ordersInfo, tradersInfo); + } + + /// @dev Fetches balance and allowances for maker and taker of order. + /// @param order The order structure. + /// @param takerAddress Address that will be filling the order. + /// @return Balances and allowances of maker and taker of order. + function getTraderInfo(LibOrder.Order memory order, address takerAddress) + public + view + returns (TraderInfo memory traderInfo) + { + (traderInfo.makerBalance, traderInfo.makerAllowance) = getBalanceAndAllowance(order.makerAddress, order.makerAssetData); + (traderInfo.takerBalance, traderInfo.takerAllowance) = getBalanceAndAllowance(takerAddress, order.takerAssetData); + return traderInfo; + } + + /// @dev Fetches balances and allowances of maker and taker for each provided order. + /// @param orders Array of order specifications. + /// @param takerAddresses Array of taker addresses corresponding to each order. + /// @return Array of balances and allowances for maker and taker of each order. + function getTradersInfo(LibOrder.Order[] memory orders, address[] memory takerAddresses) + public + view + returns (TraderInfo[] memory) + { + uint256 ordersLength = orders.length; + TraderInfo[] memory tradersInfo = new TraderInfo[](ordersLength); + for (uint256 i = 0; i != ordersLength; i++) { + tradersInfo[i] = getTraderInfo(orders[i], takerAddresses[i]); + } + return tradersInfo; + } + + /// @dev Fetches token balances and allowances of an address to given assetProxy. Supports ERC20 and ERC721. + /// @param target Address to fetch balances and allowances of. + /// @param assetData Encoded data that can be decoded by a specified proxy contract when transferring asset. + /// @return Balance of asset and allowance set to given proxy of asset. + /// For ERC721 tokens, these values will always be 1 or 0. + function getBalanceAndAllowance(address target, bytes memory assetData) + public + view + returns (uint256 balance, uint256 allowance) + { + bytes4 assetProxyId = assetData.readBytes4(0); + address token = assetData.readAddress(16); + address assetProxy = EXCHANGE.getAssetProxy(assetProxyId); + + if (assetProxyId == ERC20_DATA_ID) { + balance = IERC20Token(token).balanceOf(target); + allowance = IERC20Token(token).allowance(target, assetProxy); + } else if (assetProxyId == ERC721_DATA_ID) { + uint256 tokenId = assetData.readUint256(36); + address owner = IERC721Token(token).ownerOf(tokenId); + balance = target == owner ? 1 : 0; + bool isApproved = IERC721Token(token).isApprovedForAll(target, assetProxy) || IERC721Token(token).getApproved(tokenId) == assetProxy; + allowance = isApproved ? 1 : 0; + } else { + revert("UNSUPPORTED_ASSET_PROXY"); + } + return (balance, allowance); + } +} |