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Diffstat (limited to 'contracts/extensions/contracts/src/BalanceThresholdFilter/MixinBalanceThresholdFilterCore.sol')
| -rw-r--r-- | contracts/extensions/contracts/src/BalanceThresholdFilter/MixinBalanceThresholdFilterCore.sol | 135 |
1 files changed, 135 insertions, 0 deletions
diff --git a/contracts/extensions/contracts/src/BalanceThresholdFilter/MixinBalanceThresholdFilterCore.sol b/contracts/extensions/contracts/src/BalanceThresholdFilter/MixinBalanceThresholdFilterCore.sol new file mode 100644 index 000000000..68dabafeb --- /dev/null +++ b/contracts/extensions/contracts/src/BalanceThresholdFilter/MixinBalanceThresholdFilterCore.sol @@ -0,0 +1,135 @@ +/* + + 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/LICENSE2.0 + + 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; + +import "@0x/contracts-exchange-libs/contracts/src/LibExchangeSelectors.sol"; +import "@0x/contracts-exchange-libs/contracts/src/LibOrder.sol"; +import "./mixins/MBalanceThresholdFilterCore.sol"; +import "./MixinExchangeCalldata.sol"; + + +contract MixinBalanceThresholdFilterCore is + MBalanceThresholdFilterCore, + MixinExchangeCalldata, + LibOrder, + LibExchangeSelectors +{ + + /// @dev Executes an Exchange transaction iff the maker and taker meet + /// the hold at least `BALANCE_THRESHOLD` of the asset `THRESHOLD_ASSET` OR + /// the exchange function is a cancellation. + /// Supported Exchange functions: + /// batchFillOrders + /// batchFillOrdersNoThrow + /// batchFillOrKillOrders + /// fillOrder + /// fillOrderNoThrow + /// fillOrKillOrder + /// marketBuyOrders + /// marketBuyOrdersNoThrow + /// marketSellOrders + /// marketSellOrdersNoThrow + /// matchOrders + /// cancelOrder + /// batchCancelOrders + /// cancelOrdersUpTo + /// Trying to call any other exchange function will throw. + /// @param salt Arbitrary number to ensure uniqueness of transaction hash. + /// @param signerAddress Address of transaction signer. + /// @param signedExchangeTransaction AbiV2 encoded calldata. + /// @param signature Proof of signer transaction by signer. + function executeTransaction( + uint256 salt, + address signerAddress, + bytes signedExchangeTransaction, + bytes signature + ) + external + { + // Get accounts whose balances must be validated + address[] memory addressesToValidate = getAddressesToValidate(signerAddress); + + // Validate account balances + uint256 balanceThreshold = BALANCE_THRESHOLD; + IThresholdAsset thresholdAsset = THRESHOLD_ASSET; + for (uint256 i = 0; i < addressesToValidate.length; ++i) { + uint256 addressBalance = thresholdAsset.balanceOf(addressesToValidate[i]); + require( + addressBalance >= balanceThreshold, + "AT_LEAST_ONE_ADDRESS_DOES_NOT_MEET_BALANCE_THRESHOLD" + ); + } + emit ValidatedAddresses(addressesToValidate); + + // All addresses are valid. Execute exchange function. + EXCHANGE.executeTransaction( + salt, + signerAddress, + signedExchangeTransaction, + signature + ); + } + + /// @dev Constructs an array of addresses to be validated. + /// Addresses depend on which Exchange function is to be called + /// (defined by `signedExchangeTransaction` above). + /// @param signerAddress Address of transaction signer. + /// @return addressesToValidate Array of addresses to validate. + function getAddressesToValidate(address signerAddress) + internal pure + returns (address[] memory addressesToValidate) + { + bytes4 exchangeFunctionSelector = bytes4(exchangeCalldataload(0)); + // solhint-disable expression-indent + if ( + exchangeFunctionSelector == BATCH_FILL_ORDERS_SELECTOR || + exchangeFunctionSelector == BATCH_FILL_ORDERS_NO_THROW_SELECTOR || + exchangeFunctionSelector == BATCH_FILL_OR_KILL_ORDERS_SELECTOR || + exchangeFunctionSelector == MARKET_BUY_ORDERS_SELECTOR || + exchangeFunctionSelector == MARKET_BUY_ORDERS_NO_THROW_SELECTOR || + exchangeFunctionSelector == MARKET_SELL_ORDERS_SELECTOR || + exchangeFunctionSelector == MARKET_SELL_ORDERS_NO_THROW_SELECTOR + ) { + addressesToValidate = loadMakerAddressesFromOrderArray(0); + addressesToValidate = addressesToValidate.append(signerAddress); + } else if ( + exchangeFunctionSelector == FILL_ORDER_SELECTOR || + exchangeFunctionSelector == FILL_ORDER_NO_THROW_SELECTOR || + exchangeFunctionSelector == FILL_OR_KILL_ORDER_SELECTOR + ) { + address makerAddress = loadMakerAddressFromOrder(0); + addressesToValidate = addressesToValidate.append(makerAddress); + addressesToValidate = addressesToValidate.append(signerAddress); + } else if (exchangeFunctionSelector == MATCH_ORDERS_SELECTOR) { + address leftMakerAddress = loadMakerAddressFromOrder(0); + addressesToValidate = addressesToValidate.append(leftMakerAddress); + address rightMakerAddress = loadMakerAddressFromOrder(1); + addressesToValidate = addressesToValidate.append(rightMakerAddress); + addressesToValidate = addressesToValidate.append(signerAddress); + } else if ( + exchangeFunctionSelector != CANCEL_ORDER_SELECTOR && + exchangeFunctionSelector != BATCH_CANCEL_ORDERS_SELECTOR && + exchangeFunctionSelector != CANCEL_ORDERS_UP_TO_SELECTOR + ) { + revert("INVALID_OR_BLOCKED_EXCHANGE_SELECTOR"); + } + // solhint-enable expression-indent + return addressesToValidate; + } +} |