aDaiGateway4.sol

pragma solidity ^0.4.24;

contract Ownable {
    address public owner;

    event OwnershipTransferred(
        address indexed previousOwner,
        address indexed newOwner
    );
    /**
     * @dev The Ownable constructor sets the original `owner` of the contract to the sender
     * account.
     */
    constructor() public {
        owner = msg.sender;
    }
    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(msg.sender == owner);
        _;
    }
    /**
    * @dev Allows the current owner to transfer control of the contract to a newOwner.
    * @param newOwner The address to transfer ownership to.
    */
    function transferOwnership(address newOwner) public onlyOwner {
        require(newOwner != address(0));
        emit OwnershipTransferred(owner, newOwner);
        owner = newOwner;
    }
}

contract Erc20 {
    function balanceOf(address _owner) public view returns (uint256);
    function transfer(address _to, uint256 _value) public returns (bool);
    function approve(address _spender, uint256 _value) public returns (bool);
}

contract Exchange {
    function sellAllAmountPayEth(
        address otc,
        address wethToken,
        address buyToken,
        uint256 minBuyAmt
    ) public payable returns (uint256 buyAmt);
}

contract LendingPool {
    function deposit( address _reserve, uint256 _amount, uint16 _referralCode) external payable;
}

contract aDaiGateway is Ownable {
    Exchange constant DaiEx = Exchange(0x793EbBe21607e4F04788F89c7a9b97320773Ec59);
    LendingPool constant lendingPool = LendingPool(0x398eC7346DcD622eDc5ae82352F02bE94C62d119);

    Erc20 constant  dai = Erc20(0x6B175474E89094C44Da98b954EedeAC495271d0F);
    Erc20 constant aDai = Erc20(0xfC1E690f61EFd961294b3e1Ce3313fBD8aa4f85d);

    uint16 constant referral = 47;

    constructor() public {
        dai.approve(0x3dfd23A6c5E8BbcFc9581d2E864a68feb6a076d3, uint256(-1)); //lendingPoolCore
    }

    function() external payable {
        etherToaDai(msg.sender);
    }

    function etherToaDai(address to)
        public
        payable
        returns (uint256 outAmount)
    {
        uint256 amount = DaiEx.sellAllAmountPayEth.value(
            (msg.value * 994) / 1000
        )(
            0x794e6e91555438aFc3ccF1c5076A74F42133d08D,
            0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2,
            0x6B175474E89094C44Da98b954EedeAC495271d0F,
            1
        );
        lendingPool.deposit(address(dai), amount, referral);
        outAmount = aDai.balanceOf(address(this));
        aDai.transfer(to, outAmount);
    }

    function makeprofit() public {
        owner.transfer(address(this).balance);
    }

}