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Updated WETHGateway for withdrawETHWithPermit

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This commit is contained in:
Hadrien Charlanes 2021-04-06 15:08:19 +02:00
parent 3a6948ce2c
commit 1316cf48e4
1 changed files with 31 additions and 0 deletions
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31
contracts/misc/WETHGateway.sol
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@ -131,6 +131,37 @@ contract WETHGateway is IWETHGateway, Ownable {
_safeTransferETH(msg.sender, amount);
}
/**
* @dev withdraws the WETH _reserves of msg.sender.
* @param lendingPool address of the targeted underlying lending pool
* @param amount amount of aWETH to withdraw and receive native ETH
* @param to address of the user who will receive native ETH
*/
function withdrawETHWithPermit(
address lendingPool,
uint256 amount,
address to,
uint256 deadline,
uint8 permitV,
bytes32 permitR,
bytes32 permitS
) external override {
IAToken aWETH = IAToken(ILendingPool(lendingPool).getReserveData(address(WETH)).aTokenAddress);
uint256 userBalance = aWETH.balanceOf(msg.sender);
uint256 amountToWithdraw = amount;
// if amount is equal to uint(-1), the user wants to redeem everything
if (amount == type(uint256).max) {
amountToWithdraw = userBalance;
}
// chosing to permit `amount`and not `amountToWithdraw`, easier for frontends, intregrators.
aWETH.permit(msg.sender, address(this), amount, deadline, permitV, permitR, permitS);
aWETH.transferFrom(msg.sender, address(this), amountToWithdraw);
ILendingPool(lendingPool).withdraw(address(WETH), amountToWithdraw, address(this));
WETH.withdraw(amountToWithdraw);
_safeTransferETH(to, amountToWithdraw);
}
/**
* @dev transfer ETH to an address, revert if it fails.
* @param to recipient of the transfer