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fixing takeProtocolFee on honeyswap #8

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fixing takeProtocolFee on honeyswap #8

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fd0c610
fixing takeProtocolFee on honeyswap
Luigy-Lemon Dec 12, 2022
ec9ca2f
Fixing for the cases in which the token is a proxy address and the ca…
Luigy-Lemon Dec 15, 2022
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90 changes: 69 additions & 21 deletions contracts/DXswapFeeReceiver.sol
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Original file line number Diff line number Diff line change
Expand Up @@ -114,29 +114,77 @@ contract DXswapFeeReceiver {
_swapTokens(amount, token, address(honeyToken));
}

function bytes2addr(bytes memory data) internal returns (address addr) {
assembly {
mstore(0, mload(add(add(data, 32), 0)))
addr := mload(0)
}
}

// Take what was charged as protocol fee from the DXswap pair liquidity
function takeProtocolFee(IDXswapPair[] calldata pairs) external {
for (uint i = 0; i < pairs.length; i++) {
address token0 = pairs[i].token0();
address token1 = pairs[i].token1();
pairs[i].transfer(address(pairs[i]), pairs[i].balanceOf(address(this)));
(uint amount0, uint amount1) = pairs[i].burn(address(this));

if (amount0 > 0 && token0 != address(honeyToken))
_swapForHoney(token0, amount0);
if (amount1 > 0 && token1 != address(honeyToken))
_swapForHoney(token1, amount1);

uint256 honeyBalance = honeyToken.balanceOf(address(this));
uint256 honeyEarned = (honeyBalance.mul(splitHoneyProportion)) / ONE_HUNDRED_PERCENT;
TransferHelper.safeTransfer(address(honeyToken), honeyReceiver, honeyEarned);

uint256 honeyToConvertToHsf = honeyBalance.sub(honeyEarned);
uint256 hsfEarned = _swapTokens(honeyToConvertToHsf, address(honeyToken), address(hsfToken));
uint256 halfHsfEarned = hsfEarned / 2;
TransferHelper.safeTransfer(address(hsfToken), BURN_ADDRESS, halfHsfEarned);
TransferHelper.safeTransfer(address(hsfToken), address(hsfReceiver), halfHsfEarned);
hsfReceiver.rebalance();
for (uint256 i = 0; i < pairs.length; i++) {
uint256 pairBalance = pairs[i].balanceOf(address(this));
// skip if there's no balance rather than revert later
if ( pairBalance > 0) {
address token0 = pairs[i].token0();
address token1 = pairs[i].token1();
bytes memory data0;
bytes memory data1;
(, data0) = token0.staticcall.gas(5000)(
abi.encodeWithSignature("factory()")
);
(, data1) = token1.staticcall.gas(5000)(
abi.encodeWithSignature("factory()")
);
// if one of the Tokens is an honeyswap LP token this function reverts.
require(
bytes2addr(data0) != address(factory) &&
bytes2addr(data1) != address(factory),
"Honeyswap LP token in pair"
);

pairs[i].transfer(
address(pairs[i]),
pairBalance
);
(uint256 amount0, uint256 amount1) = pairs[i].burn(
address(this)
);

if (amount0 > 0 && token0 != address(honeyToken))
_swapForHoney(token0, amount0);
if (amount1 > 0 && token1 != address(honeyToken))
_swapForHoney(token1, amount1);

uint256 honeyBalance = honeyToken.balanceOf(address(this));
uint256 honeyEarned = (honeyBalance.mul(splitHoneyProportion)) /
ONE_HUNDRED_PERCENT;
TransferHelper.safeTransfer(
address(honeyToken),
honeyReceiver,
honeyEarned
);

uint256 honeyToConvertToHsf = honeyBalance.sub(honeyEarned);
uint256 hsfEarned = _swapTokens(
honeyToConvertToHsf,
address(honeyToken),
address(hsfToken)
);
uint256 halfHsfEarned = hsfEarned / 2;
TransferHelper.safeTransfer(
address(hsfToken),
BURN_ADDRESS,
halfHsfEarned
);
TransferHelper.safeTransfer(
address(hsfToken),
address(hsfReceiver),
halfHsfEarned
);
hsfReceiver.rebalance();
}
}
}
}