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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 0.4.14;
+
+import "./TokenTransferProxy.sol";
+import "/base/Token.sol";
+import "/base/SafeMath.sol";
+
+/// @title Exchange - Facilitates exchange of ERC20 tokens.
+/// @author Amir Bandeali - <amir@0xProject.com>, Will Warren - <will@0xProject.com>
+contract Exchange is SafeMath {
+
+ // Error Codes
+ enum Errors {
+ ORDER_EXPIRED, // Order has already expired
+ ORDER_FULLY_FILLED_OR_CANCELLED, // Order has already been fully filled or cancelled
+ ROUNDING_ERROR_TOO_LARGE, // Rounding error too large
+ INSUFFICIENT_BALANCE_OR_ALLOWANCE // Insufficient balance or allowance for token transfer
+ }
+
+ string constant public VERSION = "1.0.0";
+ uint16 constant public EXTERNAL_QUERY_GAS_LIMIT = 4999; // Changes to state require at least 5000 gas
+
+ address public ZRX_TOKEN_CONTRACT;
+ address public TOKEN_TRANSFER_PROXY_CONTRACT;
+
+ // Mappings of orderHash => amounts of takerTokenAmount filled or cancelled.
+ mapping (bytes32 => uint) public filled;
+ mapping (bytes32 => uint) public cancelled;
+
+ event LogFill(
+ address indexed maker,
+ address taker,
+ address indexed feeRecipient,
+ address makerToken,
+ address takerToken,
+ uint filledMakerTokenAmount,
+ uint filledTakerTokenAmount,
+ uint paidMakerFee,
+ uint paidTakerFee,
+ bytes32 indexed tokens, // keccak256(makerToken, takerToken), allows subscribing to a token pair
+ bytes32 orderHash
+ );
+
+ event LogCancel(
+ address indexed maker,
+ address indexed feeRecipient,
+ address makerToken,
+ address takerToken,
+ uint cancelledMakerTokenAmount,
+ uint cancelledTakerTokenAmount,
+ bytes32 indexed tokens,
+ bytes32 orderHash
+ );
+
+ event LogError(uint8 indexed errorId, bytes32 indexed orderHash);
+
+ struct Order {
+ address maker;
+ address taker;
+ address makerToken;
+ address takerToken;
+ address feeRecipient;
+ uint makerTokenAmount;
+ uint takerTokenAmount;
+ uint makerFee;
+ uint takerFee;
+ uint expirationTimestampInSec;
+ bytes32 orderHash;
+ }
+
+ function Exchange(address _zrxToken, address _tokenTransferProxy) {
+ ZRX_TOKEN_CONTRACT = _zrxToken;
+ TOKEN_TRANSFER_PROXY_CONTRACT = _tokenTransferProxy;
+ }
+
+ /*
+ * Core exchange functions
+ */
+
+ /// @dev Fills the input order.
+ /// @param orderAddresses Array of order's maker, taker, makerToken, takerToken, and feeRecipient.
+ /// @param orderValues Array of order's makerTokenAmount, takerTokenAmount, makerFee, takerFee, expirationTimestampInSec, and salt.
+ /// @param fillTakerTokenAmount Desired amount of takerToken to fill.
+ /// @param shouldThrowOnInsufficientBalanceOrAllowance Test if transfer will fail before attempting.
+ /// @param v ECDSA signature parameter v.
+ /// @param r ECDSA signature parameters r.
+ /// @param s ECDSA signature parameters s.
+ /// @return Total amount of takerToken filled in trade.
+ function fillOrder(
+ address[5] orderAddresses,
+ uint[6] orderValues,
+ uint fillTakerTokenAmount,
+ bool shouldThrowOnInsufficientBalanceOrAllowance,
+ uint8 v,
+ bytes32 r,
+ bytes32 s)
+ public
+ returns (uint filledTakerTokenAmount)
+ {
+ Order memory order = Order({
+ maker: orderAddresses[0],
+ taker: orderAddresses[1],
+ makerToken: orderAddresses[2],
+ takerToken: orderAddresses[3],
+ feeRecipient: orderAddresses[4],
+ makerTokenAmount: orderValues[0],
+ takerTokenAmount: orderValues[1],
+ makerFee: orderValues[2],
+ takerFee: orderValues[3],
+ expirationTimestampInSec: orderValues[4],
+ orderHash: getOrderHash(orderAddresses, orderValues)
+ });
+
+ require(order.taker == address(0) || order.taker == msg.sender);
+ require(order.makerTokenAmount > 0 && order.takerTokenAmount > 0 && fillTakerTokenAmount > 0);
+ require(isValidSignature(
+ order.maker,
+ order.orderHash,
+ v,
+ r,
+ s
+ ));
+
+ if (block.timestamp >= order.expirationTimestampInSec) {
+ LogError(uint8(Errors.ORDER_EXPIRED), order.orderHash);
+ return 0;
+ }
+
+ uint remainingTakerTokenAmount = safeSub(order.takerTokenAmount, getUnavailableTakerTokenAmount(order.orderHash));
+ filledTakerTokenAmount = min256(fillTakerTokenAmount, remainingTakerTokenAmount);
+ if (filledTakerTokenAmount == 0) {
+ LogError(uint8(Errors.ORDER_FULLY_FILLED_OR_CANCELLED), order.orderHash);
+ return 0;
+ }
+
+ if (isRoundingError(filledTakerTokenAmount, order.takerTokenAmount, order.makerTokenAmount)) {
+ LogError(uint8(Errors.ROUNDING_ERROR_TOO_LARGE), order.orderHash);
+ return 0;
+ }
+
+ if (!shouldThrowOnInsufficientBalanceOrAllowance && !isTransferable(order, filledTakerTokenAmount)) {
+ LogError(uint8(Errors.INSUFFICIENT_BALANCE_OR_ALLOWANCE), order.orderHash);
+ return 0;
+ }
+
+ uint filledMakerTokenAmount = getPartialAmount(filledTakerTokenAmount, order.takerTokenAmount, order.makerTokenAmount);
+ uint paidMakerFee;
+ uint paidTakerFee;
+ filled[order.orderHash] = safeAdd(filled[order.orderHash], filledTakerTokenAmount);
+ require(transferViaTokenTransferProxy(
+ order.makerToken,
+ order.maker,
+ msg.sender,
+ filledMakerTokenAmount
+ ));
+ require(transferViaTokenTransferProxy(
+ order.takerToken,
+ msg.sender,
+ order.maker,
+ filledTakerTokenAmount
+ ));
+ if (order.feeRecipient != address(0)) {
+ if (order.makerFee > 0) {
+ paidMakerFee = getPartialAmount(filledTakerTokenAmount, order.takerTokenAmount, order.makerFee);
+ require(transferViaTokenTransferProxy(
+ ZRX_TOKEN_CONTRACT,
+ order.maker,
+ order.feeRecipient,
+ paidMakerFee
+ ));
+ }
+ if (order.takerFee > 0) {
+ paidTakerFee = getPartialAmount(filledTakerTokenAmount, order.takerTokenAmount, order.takerFee);
+ require(transferViaTokenTransferProxy(
+ ZRX_TOKEN_CONTRACT,
+ msg.sender,
+ order.feeRecipient,
+ paidTakerFee
+ ));
+ }
+ }
+
+ LogFill(
+ order.maker,
+ msg.sender,
+ order.feeRecipient,
+ order.makerToken,
+ order.takerToken,
+ filledMakerTokenAmount,
+ filledTakerTokenAmount,
+ paidMakerFee,
+ paidTakerFee,
+ keccak256(order.makerToken, order.takerToken),
+ order.orderHash
+ );
+ return filledTakerTokenAmount;
+ }
+
+ /// @dev Cancels the input order.
+ /// @param orderAddresses Array of order's maker, taker, makerToken, takerToken, and feeRecipient.
+ /// @param orderValues Array of order's makerTokenAmount, takerTokenAmount, makerFee, takerFee, expirationTimestampInSec, and salt.
+ /// @param cancelTakerTokenAmount Desired amount of takerToken to cancel in order.
+ /// @return Amount of takerToken cancelled.
+ function cancelOrder(
+ address[5] orderAddresses,
+ uint[6] orderValues,
+ uint cancelTakerTokenAmount)
+ public
+ returns (uint)
+ {
+ Order memory order = Order({
+ maker: orderAddresses[0],
+ taker: orderAddresses[1],
+ makerToken: orderAddresses[2],
+ takerToken: orderAddresses[3],
+ feeRecipient: orderAddresses[4],
+ makerTokenAmount: orderValues[0],
+ takerTokenAmount: orderValues[1],
+ makerFee: orderValues[2],
+ takerFee: orderValues[3],
+ expirationTimestampInSec: orderValues[4],
+ orderHash: getOrderHash(orderAddresses, orderValues)
+ });
+
+ require(order.maker == msg.sender);
+ require(order.makerTokenAmount > 0 && order.takerTokenAmount > 0 && cancelTakerTokenAmount > 0);
+
+ if (block.timestamp >= order.expirationTimestampInSec) {
+ LogError(uint8(Errors.ORDER_EXPIRED), order.orderHash);
+ return 0;
+ }
+
+ uint remainingTakerTokenAmount = safeSub(order.takerTokenAmount, getUnavailableTakerTokenAmount(order.orderHash));
+ uint cancelledTakerTokenAmount = min256(cancelTakerTokenAmount, remainingTakerTokenAmount);
+ if (cancelledTakerTokenAmount == 0) {
+ LogError(uint8(Errors.ORDER_FULLY_FILLED_OR_CANCELLED), order.orderHash);
+ return 0;
+ }
+
+ cancelled[order.orderHash] = safeAdd(cancelled[order.orderHash], cancelledTakerTokenAmount);
+
+ LogCancel(
+ order.maker,
+ order.feeRecipient,
+ order.makerToken,
+ order.takerToken,
+ getPartialAmount(cancelledTakerTokenAmount, order.takerTokenAmount, order.makerTokenAmount),
+ cancelledTakerTokenAmount,
+ keccak256(order.makerToken, order.takerToken),
+ order.orderHash
+ );
+ return cancelledTakerTokenAmount;
+ }
+
+ /*
+ * Wrapper functions
+ */
+
+ /// @dev Fills an order with specified parameters and ECDSA signature, throws if specified amount not filled entirely.
+ /// @param orderAddresses Array of order's maker, taker, makerToken, takerToken, and feeRecipient.
+ /// @param orderValues Array of order's makerTokenAmount, takerTokenAmount, makerFee, takerFee, expirationTimestampInSec, and salt.
+ /// @param fillTakerTokenAmount Desired amount of takerToken to fill.
+ /// @param v ECDSA signature parameter v.
+ /// @param r ECDSA signature parameters r.
+ /// @param s ECDSA signature parameters s.
+ function fillOrKillOrder(
+ address[5] orderAddresses,
+ uint[6] orderValues,
+ uint fillTakerTokenAmount,
+ uint8 v,
+ bytes32 r,
+ bytes32 s)
+ public
+ {
+ require(fillOrder(
+ orderAddresses,
+ orderValues,
+ fillTakerTokenAmount,
+ false,
+ v,
+ r,
+ s
+ ) == fillTakerTokenAmount);
+ }
+
+ /// @dev Synchronously executes multiple fill orders in a single transaction.
+ /// @param orderAddresses Array of address arrays containing individual order addresses.
+ /// @param orderValues Array of uint arrays containing individual order values.
+ /// @param fillTakerTokenAmounts Array of desired amounts of takerToken to fill in orders.
+ /// @param shouldThrowOnInsufficientBalanceOrAllowance Test if transfers will fail before attempting.
+ /// @param v Array ECDSA signature v parameters.
+ /// @param r Array of ECDSA signature r parameters.
+ /// @param s Array of ECDSA signature s parameters.
+ function batchFillOrders(
+ address[5][] orderAddresses,
+ uint[6][] orderValues,
+ uint[] fillTakerTokenAmounts,
+ bool shouldThrowOnInsufficientBalanceOrAllowance,
+ uint8[] v,
+ bytes32[] r,
+ bytes32[] s)
+ public
+ {
+ for (uint i = 0; i < orderAddresses.length; i++) {
+ fillOrder(
+ orderAddresses[i],
+ orderValues[i],
+ fillTakerTokenAmounts[i],
+ shouldThrowOnInsufficientBalanceOrAllowance,
+ v[i],
+ r[i],
+ s[i]
+ );
+ }
+ }
+
+ /// @dev Synchronously executes multiple fillOrKill orders in a single transaction.
+ /// @param orderAddresses Array of address arrays containing individual order addresses.
+ /// @param orderValues Array of uint arrays containing individual order values.
+ /// @param fillTakerTokenAmounts Array of desired amounts of takerToken to fill in orders.
+ /// @param v Array ECDSA signature v parameters.
+ /// @param r Array of ECDSA signature r parameters.
+ /// @param s Array of ECDSA signature s parameters.
+ function batchFillOrKillOrders(
+ address[5][] orderAddresses,
+ uint[6][] orderValues,
+ uint[] fillTakerTokenAmounts,
+ uint8[] v,
+ bytes32[] r,
+ bytes32[] s)
+ public
+ {
+ for (uint i = 0; i < orderAddresses.length; i++) {
+ fillOrKillOrder(
+ orderAddresses[i],
+ orderValues[i],
+ fillTakerTokenAmounts[i],
+ v[i],
+ r[i],
+ s[i]
+ );
+ }
+ }
+
+ /// @dev Synchronously executes multiple fill orders in a single transaction until total fillTakerTokenAmount filled.
+ /// @param orderAddresses Array of address arrays containing individual order addresses.
+ /// @param orderValues Array of uint arrays containing individual order values.
+ /// @param fillTakerTokenAmount Desired total amount of takerToken to fill in orders.
+ /// @param shouldThrowOnInsufficientBalanceOrAllowance Test if transfers will fail before attempting.
+ /// @param v Array ECDSA signature v parameters.
+ /// @param r Array of ECDSA signature r parameters.
+ /// @param s Array of ECDSA signature s parameters.
+ /// @return Total amount of fillTakerTokenAmount filled in orders.
+ function fillOrdersUpTo(
+ address[5][] orderAddresses,
+ uint[6][] orderValues,
+ uint fillTakerTokenAmount,
+ bool shouldThrowOnInsufficientBalanceOrAllowance,
+ uint8[] v,
+ bytes32[] r,
+ bytes32[] s)
+ public
+ returns (uint)
+ {
+ uint filledTakerTokenAmount = 0;
+ for (uint i = 0; i < orderAddresses.length; i++) {
+ require(orderAddresses[i][3] == orderAddresses[0][3]); // takerToken must be the same for each order
+ filledTakerTokenAmount = safeAdd(filledTakerTokenAmount, fillOrder(
+ orderAddresses[i],
+ orderValues[i],
+ safeSub(fillTakerTokenAmount, filledTakerTokenAmount),
+ shouldThrowOnInsufficientBalanceOrAllowance,
+ v[i],
+ r[i],
+ s[i]
+ ));
+ if (filledTakerTokenAmount == fillTakerTokenAmount) break;
+ }
+ return filledTakerTokenAmount;
+ }
+
+ /// @dev Synchronously cancels multiple orders in a single transaction.
+ /// @param orderAddresses Array of address arrays containing individual order addresses.
+ /// @param orderValues Array of uint arrays containing individual order values.
+ /// @param cancelTakerTokenAmounts Array of desired amounts of takerToken to cancel in orders.
+ function batchCancelOrders(
+ address[5][] orderAddresses,
+ uint[6][] orderValues,
+ uint[] cancelTakerTokenAmounts)
+ public
+ {
+ for (uint i = 0; i < orderAddresses.length; i++) {
+ cancelOrder(
+ orderAddresses[i],
+ orderValues[i],
+ cancelTakerTokenAmounts[i]
+ );
+ }
+ }
+
+ /*
+ * Constant public functions
+ */
+
+ /// @dev Calculates Keccak-256 hash of order with specified parameters.
+ /// @param orderAddresses Array of order's maker, taker, makerToken, takerToken, and feeRecipient.
+ /// @param orderValues Array of order's makerTokenAmount, takerTokenAmount, makerFee, takerFee, expirationTimestampInSec, and salt.
+ /// @return Keccak-256 hash of order.
+ function getOrderHash(address[5] orderAddresses, uint[6] orderValues)
+ public
+ constant
+ returns (bytes32)
+ {
+ return keccak256(
+ address(this),
+ orderAddresses[0], // maker
+ orderAddresses[1], // taker
+ orderAddresses[2], // makerToken
+ orderAddresses[3], // takerToken
+ orderAddresses[4], // feeRecipient
+ orderValues[0], // makerTokenAmount
+ orderValues[1], // takerTokenAmount
+ orderValues[2], // makerFee
+ orderValues[3], // takerFee
+ orderValues[4], // expirationTimestampInSec
+ orderValues[5] // salt
+ );
+ }
+
+ /// @dev Verifies that an order signature is valid.
+ /// @param signer address of signer.
+ /// @param hash Signed Keccak-256 hash.
+ /// @param v ECDSA signature parameter v.
+ /// @param r ECDSA signature parameters r.
+ /// @param s ECDSA signature parameters s.
+ /// @return Validity of order signature.
+ function isValidSignature(
+ address signer,
+ bytes32 hash,
+ uint8 v,
+ bytes32 r,
+ bytes32 s)
+ public
+ constant
+ returns (bool)
+ {
+ return signer == ecrecover(
+ keccak256("\x19Ethereum Signed Message:\n32", hash),
+ v,
+ r,
+ s
+ );
+ }
+
+ /// @dev Checks if rounding error > 0.1%.
+ /// @param numerator Numerator.
+ /// @param denominator Denominator.
+ /// @param target Value to multiply with numerator/denominator.
+ /// @return Rounding error is present.
+ function isRoundingError(uint numerator, uint denominator, uint target)
+ public
+ constant
+ returns (bool)
+ {
+ uint remainder = mulmod(target, numerator, denominator);
+ if (remainder == 0) return false; // No rounding error.
+
+ uint errPercentageTimes1000000 = safeDiv(
+ safeMul(remainder, 1000000),
+ safeMul(numerator, target)
+ );
+ return errPercentageTimes1000000 > 1000;
+ }
+
+ /// @dev Calculates partial value given a numerator and denominator.
+ /// @param numerator Numerator.
+ /// @param denominator Denominator.
+ /// @param target Value to calculate partial of.
+ /// @return Partial value of target.
+ function getPartialAmount(uint numerator, uint denominator, uint target)
+ public
+ constant
+ returns (uint)
+ {
+ return safeDiv(safeMul(numerator, target), denominator);
+ }
+
+ /// @dev Calculates the sum of values already filled and cancelled for a given order.
+ /// @param orderHash The Keccak-256 hash of the given order.
+ /// @return Sum of values already filled and cancelled.
+ function getUnavailableTakerTokenAmount(bytes32 orderHash)
+ public
+ constant
+ returns (uint)
+ {
+ return safeAdd(filled[orderHash], cancelled[orderHash]);
+ }
+
+
+ /*
+ * Internal functions
+ */
+
+ /// @dev Transfers a token using TokenTransferProxy transferFrom function.
+ /// @param token Address of token to transferFrom.
+ /// @param from Address transfering token.
+ /// @param to Address receiving token.
+ /// @param value Amount of token to transfer.
+ /// @return Success of token transfer.
+ function transferViaTokenTransferProxy(
+ address token,
+ address from,
+ address to,
+ uint value)
+ internal
+ returns (bool)
+ {
+ return TokenTransferProxy(TOKEN_TRANSFER_PROXY_CONTRACT).transferFrom(token, from, to, value);
+ }
+
+ /// @dev Checks if any order transfers will fail.
+ /// @param order Order struct of params that will be checked.
+ /// @param fillTakerTokenAmount Desired amount of takerToken to fill.
+ /// @return Predicted result of transfers.
+ function isTransferable(Order order, uint fillTakerTokenAmount)
+ internal
+ constant // The called token contracts may attempt to change state, but will not be able to due to gas limits on getBalance and getAllowance.
+ returns (bool)
+ {
+ address taker = msg.sender;
+ uint fillMakerTokenAmount = getPartialAmount(fillTakerTokenAmount, order.takerTokenAmount, order.makerTokenAmount);
+
+ if (order.feeRecipient != address(0)) {
+ bool isMakerTokenZRX = order.makerToken == ZRX_TOKEN_CONTRACT;
+ bool isTakerTokenZRX = order.takerToken == ZRX_TOKEN_CONTRACT;
+ uint paidMakerFee = getPartialAmount(fillTakerTokenAmount, order.takerTokenAmount, order.makerFee);
+ uint paidTakerFee = getPartialAmount(fillTakerTokenAmount, order.takerTokenAmount, order.takerFee);
+ uint requiredMakerZRX = isMakerTokenZRX ? safeAdd(fillMakerTokenAmount, paidMakerFee) : paidMakerFee;
+ uint requiredTakerZRX = isTakerTokenZRX ? safeAdd(fillTakerTokenAmount, paidTakerFee) : paidTakerFee;
+
+ if ( getBalance(ZRX_TOKEN_CONTRACT, order.maker) < requiredMakerZRX
+ || getAllowance(ZRX_TOKEN_CONTRACT, order.maker) < requiredMakerZRX
+ || getBalance(ZRX_TOKEN_CONTRACT, taker) < requiredTakerZRX
+ || getAllowance(ZRX_TOKEN_CONTRACT, taker) < requiredTakerZRX
+ ) return false;
+
+ if (!isMakerTokenZRX && ( getBalance(order.makerToken, order.maker) < fillMakerTokenAmount // Don't double check makerToken if ZRX
+ || getAllowance(order.makerToken, order.maker) < fillMakerTokenAmount)
+ ) return false;
+ if (!isTakerTokenZRX && ( getBalance(order.takerToken, taker) < fillTakerTokenAmount // Don't double check takerToken if ZRX
+ || getAllowance(order.takerToken, taker) < fillTakerTokenAmount)
+ ) return false;
+ } else if ( getBalance(order.makerToken, order.maker) < fillMakerTokenAmount
+ || getAllowance(order.makerToken, order.maker) < fillMakerTokenAmount
+ || getBalance(order.takerToken, taker) < fillTakerTokenAmount
+ || getAllowance(order.takerToken, taker) < fillTakerTokenAmount
+ ) return false;
+
+ return true;
+ }
+
+ /// @dev Get token balance of an address.
+ /// @param token Address of token.
+ /// @param owner Address of owner.
+ /// @return Token balance of owner.
+ function getBalance(address token, address owner)
+ internal
+ constant // The called token contract may attempt to change state, but will not be able to due to an added gas limit.
+ returns (uint)
+ {
+ return Token(token).balanceOf.gas(EXTERNAL_QUERY_GAS_LIMIT)(owner); // Limit gas to prevent reentrancy
+ }
+
+ /// @dev Get allowance of token given to TokenTransferProxy by an address.
+ /// @param token Address of token.
+ /// @param owner Address of owner.
+ /// @return Allowance of token given to TokenTransferProxy by owner.
+ function getAllowance(address token, address owner)
+ internal
+ constant // The called token contract may attempt to change state, but will not be able to due to an added gas limit.
+ returns (uint)
+ {
+ return Token(token).allowance.gas(EXTERNAL_QUERY_GAS_LIMIT)(owner, TOKEN_TRANSFER_PROXY_CONTRACT); // Limit gas to prevent reentrancy
+ }
+}