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OneSplit.sol
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pragma solidity ^0.5.0;
import "./IOneSplit.sol";
import "./OneSplitBase.sol";
import "./OneSplitMultiPath.sol";
import "./OneSplitCompound.sol";
import "./OneSplitFulcrum.sol";
import "./OneSplitChai.sol";
import "./OneSplitBdai.sol";
import "./OneSplitIearn.sol";
import "./OneSplitIdle.sol";
import "./OneSplitAave.sol";
import "./OneSplitWeth.sol";
import "./OneSplitUniswapPoolToken.sol";
import "./OneSplitBalancerPoolToken.sol";
import "./OneSplitCurveSusdPoolToken.sol";
//import "./OneSplitSmartToken.sol";
contract OneSplitView is
IOneSplitView,
OneSplitBaseView,
OneSplitMultiPathView,
OneSplitChaiView,
OneSplitBdaiView,
OneSplitAaveView,
OneSplitFulcrumView,
OneSplitCompoundView,
OneSplitIearnView,
OneSplitIdleView(0x23E4D1536c449e4D79E5903B4A9ddc3655be8609),
OneSplitWethView,
OneSplitUniswapPoolTokenView,
OneSplitBalancerPoolTokenView,
OneSplitCurveSusdPoolTokenView
//OneSplitSmartTokenView
{
function() external {
if (msg.sig == IOneSplit(0).getExpectedReturn.selector) {
(
,
IERC20 fromToken,
IERC20 toToken,
uint256 amount,
uint256 parts,
uint256 disableFlags
) = abi.decode(
abi.encodePacked(bytes28(0), msg.data),
(uint256,IERC20,IERC20,uint256,uint256,uint256)
);
(
uint256 returnAmount,
uint256[] memory distribution
) = getExpectedReturn(
fromToken,
toToken,
amount,
parts,
disableFlags
);
bytes memory result = abi.encodePacked(returnAmount, distribution);
assembly {
return(add(result, 32), sload(result))
}
}
}
function getExpectedReturn(
IERC20 fromToken,
IERC20 toToken,
uint256 amount,
uint256 parts,
uint256 disableFlags
)
internal
returns(
uint256 returnAmount,
uint256[] memory distribution
)
{
if (fromToken == toToken) {
return (amount, new uint256[](DEXES_COUNT));
}
super.getExpectedReturn(
fromToken,
toToken,
amount,
parts,
disableFlags
);
}
}
contract OneSplit is
OneSplitBase,
OneSplitMultiPath,
OneSplitChai,
OneSplitBdai,
OneSplitAave,
OneSplitFulcrum,
OneSplitCompound,
OneSplitIearn,
OneSplitIdle(0x23E4D1536c449e4D79E5903B4A9ddc3655be8609),
OneSplitWeth,
OneSplitUniswapPoolToken,
OneSplitBalancerPoolToken,
OneSplitCurveSusdPoolToken
//OneSplitSmartToken
{
IOneSplitView public oneSplitView;
constructor(IOneSplitView _oneSplitView) public {
oneSplitView = _oneSplitView;
}
function getExpectedReturn(
IERC20 fromToken,
IERC20 toToken,
uint256 amount,
uint256 parts,
uint256 disableFlags // 1 - Uniswap, 2 - Kyber, 4 - Bancor, 8 - Oasis, 16 - Compound, 32 - Fulcrum, 64 - Chai, 128 - Aave, 256 - SmartToken, 1024 - bDAI
)
public
view
returns(
uint256 /*returnAmount*/,
uint256[] memory /*distribution*/
)
{
(bool success, bytes memory data) = address(oneSplitView).staticcall(
abi.encodeWithSelector(
this.getExpectedReturn.selector,
fromToken,
toToken,
amount,
parts,
disableFlags
)
);
assembly {
switch success
// delegatecall returns 0 on error.
case 0 { revert(add(data, 32), returndatasize) }
default { return(add(data, 32), returndatasize) }
}
}
function swap(
IERC20 fromToken,
IERC20 toToken,
uint256 amount,
uint256 minReturn,
uint256[] memory distribution, // [Uniswap, Kyber, Bancor, Oasis]
uint256 disableFlags // 16 - Compound, 32 - Fulcrum, 64 - Chai, 128 - Aave, 256 - SmartToken, 1024 - bDAI
) public payable {
fromToken.universalTransferFrom(msg.sender, address(this), amount);
_swap(fromToken, toToken, amount, distribution, disableFlags);
uint256 returnAmount = toToken.universalBalanceOf(address(this));
require(returnAmount >= minReturn, "OneSplit: actual return amount is less than minReturn");
toToken.universalTransfer(msg.sender, returnAmount);
fromToken.universalTransfer(msg.sender, fromToken.universalBalanceOf(address(this)));
}
function _swap(
IERC20 fromToken,
IERC20 toToken,
uint256 amount,
uint256[] memory distribution, // [Uniswap, Kyber, Bancor, Oasis]
uint256 disableFlags // 16 - Compound, 32 - Fulcrum, 64 - Chai, 128 - Aave, 256 - SmartToken, 1024 - bDAI
) internal {
if (fromToken == toToken) {
return;
}
return super._swap(
fromToken,
toToken,
amount,
distribution,
disableFlags
);
}
}