pragma solidity ^0.6.0;
pragma experimental ABIEncoderV2;



 contract DefisaverLogger {
    event LogEvent(
        address indexed contractAddress,
        address indexed caller,
        string indexed logName,
        bytes data
    );

    // solhint-disable-next-line func-name-mixedcase
    function Log(address _contract, address _caller, string memory _logName, bytes memory _data)
        public
    {
        emit LogEvent(_contract, _caller, _logName, _data);
    }
} contract Discount {
    address public owner;
    mapping(address => CustomServiceFee) public serviceFees;

    uint256 constant MAX_SERVICE_FEE = 400;

    struct CustomServiceFee {
        bool active;
        uint256 amount;
    }

    constructor() public {
        owner = msg.sender;
    }

    function isCustomFeeSet(address _user) public view returns (bool) {
        return serviceFees[_user].active;
    }

    function getCustomServiceFee(address _user) public view returns (uint256) {
        return serviceFees[_user].amount;
    }

    function setServiceFee(address _user, uint256 _fee) public {
        require(msg.sender == owner, "Only owner");
        require(_fee >= MAX_SERVICE_FEE || _fee == 0);

        serviceFees[_user] = CustomServiceFee({active: true, amount: _fee});
    }

    function disableServiceFee(address _user) public {
        require(msg.sender == owner, "Only owner");

        serviceFees[_user] = CustomServiceFee({active: false, amount: 0});
    }
} abstract contract PipInterface {
    function read() public virtual returns (bytes32);
} abstract contract Spotter {
    struct Ilk {
        PipInterface pip;
        uint256 mat;
    }

    mapping (bytes32 => Ilk) public ilks;

    uint256 public par;

} abstract contract Jug {
    struct Ilk {
        uint256 duty;
        uint256  rho;
    }

    mapping (bytes32 => Ilk) public ilks;

    function drip(bytes32) public virtual returns (uint);
} abstract contract Vat {

    struct Urn {
        uint256 ink;   // Locked Collateral  [wad]
        uint256 art;   // Normalised Debt    [wad]
    }

    struct Ilk {
        uint256 Art;   // Total Normalised Debt     [wad]
        uint256 rate;  // Accumulated Rates         [ray]
        uint256 spot;  // Price with Safety Margin  [ray]
        uint256 line;  // Debt Ceiling              [rad]
        uint256 dust;  // Urn Debt Floor            [rad]
    }

    mapping (bytes32 => mapping (address => Urn )) public urns;
    mapping (bytes32 => Ilk)                       public ilks;
    mapping (bytes32 => mapping (address => uint)) public gem;  // [wad]

    function can(address, address) virtual public view returns (uint);
    function dai(address) virtual public view returns (uint);
    function frob(bytes32, address, address, address, int, int) virtual public;
    function hope(address) virtual public;
    function move(address, address, uint) virtual public;
    function fork(bytes32, address, address, int, int) virtual public;
} abstract contract Gem {
    function dec() virtual public returns (uint);
    function gem() virtual public returns (Gem);
    function join(address, uint) virtual public payable;
    function exit(address, uint) virtual public;

    function approve(address, uint) virtual public;
    function transfer(address, uint) virtual public returns (bool);
    function transferFrom(address, address, uint) virtual public returns (bool);
    function deposit() virtual public payable;
    function withdraw(uint) virtual public;
    function allowance(address, address) virtual public returns (uint);
} abstract contract DaiJoin {
    function vat() public virtual returns (Vat);
    function dai() public virtual returns (Gem);
    function join(address, uint) public virtual payable;
    function exit(address, uint) public virtual;
} abstract contract Join {
    bytes32 public ilk;

    function dec() virtual public view returns (uint);
    function gem() virtual public view returns (Gem);
    function join(address, uint) virtual public payable;
    function exit(address, uint) virtual public;
} contract DSMath {
    function add(uint256 x, uint256 y) internal pure returns (uint256 z) {
        require((z = x + y) >= x);
    }

    function sub(uint256 x, uint256 y) internal pure returns (uint256 z) {
        require((z = x - y) <= x);
    }

    function mul(uint256 x, uint256 y) internal pure returns (uint256 z) {
        require(y == 0 || (z = x * y) / y == x);
    }

    function div(uint256 x, uint256 y) internal pure returns (uint256 z) {
        return x / y;
    }

    function min(uint256 x, uint256 y) internal pure returns (uint256 z) {
        return x <= y ? x : y;
    }

    function max(uint256 x, uint256 y) internal pure returns (uint256 z) {
        return x >= y ? x : y;
    }

    function imin(int256 x, int256 y) internal pure returns (int256 z) {
        return x <= y ? x : y;
    }

    function imax(int256 x, int256 y) internal pure returns (int256 z) {
        return x >= y ? x : y;
    }

    uint256 constant WAD = 10**18;
    uint256 constant RAY = 10**27;

    function wmul(uint256 x, uint256 y) internal pure returns (uint256 z) {
        z = add(mul(x, y), WAD / 2) / WAD;
    }

    function rmul(uint256 x, uint256 y) internal pure returns (uint256 z) {
        z = add(mul(x, y), RAY / 2) / RAY;
    }

    function wdiv(uint256 x, uint256 y) internal pure returns (uint256 z) {
        z = add(mul(x, WAD), y / 2) / y;
    }

    function rdiv(uint256 x, uint256 y) internal pure returns (uint256 z) {
        z = add(mul(x, RAY), y / 2) / y;
    }

    // This famous algorithm is called "exponentiation by squaring"
    // and calculates x^n with x as fixed-point and n as regular unsigned.
    //
    // It's O(log n), instead of O(n) for naive repeated multiplication.
    //
    // These facts are why it works:
    //
    //  If n is even, then x^n = (x^2)^(n/2).
    //  If n is odd,  then x^n = x * x^(n-1),
    //   and applying the equation for even x gives
    //    x^n = x * (x^2)^((n-1) / 2).
    //
    //  Also, EVM division is flooring and
    //    floor[(n-1) / 2] = floor[n / 2].
    //
    function rpow(uint256 x, uint256 n) internal pure returns (uint256 z) {
        z = n % 2 != 0 ? x : RAY;

        for (n /= 2; n != 0; n /= 2) {
            x = rmul(x, x);

            if (n % 2 != 0) {
                z = rmul(z, x);
            }
        }
    }
} abstract contract DSAuthority {
    function canCall(address src, address dst, bytes4 sig) public virtual view returns (bool);
} contract DSAuthEvents {
    event LogSetAuthority(address indexed authority);
    event LogSetOwner(address indexed owner);
}


contract DSAuth is DSAuthEvents {
    DSAuthority public authority;
    address public owner;

    constructor() public {
        owner = msg.sender;
        emit LogSetOwner(msg.sender);
    }

    function setOwner(address owner_) public auth {
        owner = owner_;
        emit LogSetOwner(owner);
    }

    function setAuthority(DSAuthority authority_) public auth {
        authority = authority_;
        emit LogSetAuthority(address(authority));
    }

    modifier auth {
        require(isAuthorized(msg.sender, msg.sig));
        _;
    }

    function isAuthorized(address src, bytes4 sig) internal view returns (bool) {
        if (src == address(this)) {
            return true;
        } else if (src == owner) {
            return true;
        } else if (authority == DSAuthority(0)) {
            return false;
        } else {
            return authority.canCall(src, address(this), sig);
        }
    }
} contract DSNote {
    event LogNote(
        bytes4 indexed sig,
        address indexed guy,
        bytes32 indexed foo,
        bytes32 indexed bar,
        uint256 wad,
        bytes fax
    ) anonymous;

    modifier note {
        bytes32 foo;
        bytes32 bar;

        assembly {
            foo := calldataload(4)
            bar := calldataload(36)
        }

        emit LogNote(msg.sig, msg.sender, foo, bar, msg.value, msg.data);

        _;
    }
} abstract contract DSProxy is DSAuth, DSNote {
    DSProxyCache public cache; // global cache for contracts

    constructor(address _cacheAddr) public {
        require(setCache(_cacheAddr));
    }

    // solhint-disable-next-line no-empty-blocks
    receive() external payable {}

    // use the proxy to execute calldata _data on contract _code
    // function execute(bytes memory _code, bytes memory _data)
    //     public
    //     payable
    //     virtual
    //     returns (address target, bytes32 response);

    function execute(address _target, bytes memory _data)
        public
        payable
        virtual
        returns (bytes32 response);

    //set new cache
    function setCache(address _cacheAddr) public virtual payable returns (bool);
}


contract DSProxyCache {
    mapping(bytes32 => address) cache;

    function read(bytes memory _code) public view returns (address) {
        bytes32 hash = keccak256(_code);
        return cache[hash];
    }

    function write(bytes memory _code) public returns (address target) {
        assembly {
            target := create(0, add(_code, 0x20), mload(_code))
            switch iszero(extcodesize(target))
                case 1 {
                    // throw if contract failed to deploy
                    revert(0, 0)
                }
        }
        bytes32 hash = keccak256(_code);
        cache[hash] = target;
    }
} abstract contract Manager {
    function last(address) virtual public returns (uint);
    function cdpCan(address, uint, address) virtual public view returns (uint);
    function ilks(uint) virtual public view returns (bytes32);
    function owns(uint) virtual public view returns (address);
    function urns(uint) virtual public view returns (address);
    function vat() virtual public view returns (address);
    function open(bytes32, address) virtual public returns (uint);
    function give(uint, address) virtual public;
    function cdpAllow(uint, address, uint) virtual public;
    function urnAllow(address, uint) virtual public;
    function frob(uint, int, int) virtual public;
    function flux(uint, address, uint) virtual public;
    function move(uint, address, uint) virtual public;
    function exit(address, uint, address, uint) virtual public;
    function quit(uint, address) virtual public;
    function enter(address, uint) virtual public;
    function shift(uint, uint) virtual public;
} /// @title Helper methods for MCDSaverProxy
contract MCDSaverProxyHelper is DSMath {

    enum ManagerType { MCD, BPROTOCOL }

    /// @notice Returns a normalized debt _amount based on the current rate
    /// @param _amount Amount of dai to be normalized
    /// @param _rate Current rate of the stability fee
    /// @param _daiVatBalance Balance od Dai in the Vat for that CDP
    function normalizeDrawAmount(uint _amount, uint _rate, uint _daiVatBalance) internal pure returns (int dart) {
        if (_daiVatBalance < mul(_amount, RAY)) {
            dart = toPositiveInt(sub(mul(_amount, RAY), _daiVatBalance) / _rate);
            dart = mul(uint(dart), _rate) < mul(_amount, RAY) ? dart + 1 : dart;
        }
    }

    /// @notice Converts a number to Rad percision
    /// @param _wad The input number in wad percision
    function toRad(uint _wad) internal pure returns (uint) {
        return mul(_wad, 10 ** 27);
    }

    /// @notice Converts a number to 18 decimal percision
    /// @param _joinAddr Join address of the collateral
    /// @param _amount Number to be converted
    function convertTo18(address _joinAddr, uint256 _amount) internal view returns (uint256) {
        return mul(_amount, 10 ** (18 - Join(_joinAddr).dec()));
    }

    /// @notice Converts a uint to int and checks if positive
    /// @param _x Number to be converted
    function toPositiveInt(uint _x) internal pure returns (int y) {
        y = int(_x);
        require(y >= 0, "int-overflow");
    }

    /// @notice Gets Dai amount in Vat which can be added to Cdp
    /// @param _vat Address of Vat contract
    /// @param _urn Urn of the Cdp
    /// @param _ilk Ilk of the Cdp
    function normalizePaybackAmount(address _vat, address _urn, bytes32 _ilk) internal view returns (int amount) {
        uint dai = Vat(_vat).dai(_urn);

        (, uint rate,,,) = Vat(_vat).ilks(_ilk);
        (, uint art) = Vat(_vat).urns(_ilk, _urn);

        amount = toPositiveInt(dai / rate);
        amount = uint(amount) <= art ? - amount : - toPositiveInt(art);
    }

    /// @notice Gets the whole debt of the CDP
    /// @param _vat Address of Vat contract
    /// @param _usr Address of the Dai holder
    /// @param _urn Urn of the Cdp
    /// @param _ilk Ilk of the Cdp
    function getAllDebt(address _vat, address _usr, address _urn, bytes32 _ilk) internal view returns (uint daiAmount) {
        (, uint rate,,,) = Vat(_vat).ilks(_ilk);
        (, uint art) = Vat(_vat).urns(_ilk, _urn);
        uint dai = Vat(_vat).dai(_usr);

        uint rad = sub(mul(art, rate), dai);
        daiAmount = rad / RAY;

        daiAmount = mul(daiAmount, RAY) < rad ? daiAmount + 1 : daiAmount;
    }

    /// @notice Gets the token address from the Join contract
    /// @param _joinAddr Address of the Join contract
    function getCollateralAddr(address _joinAddr) internal view returns (address) {
        return address(Join(_joinAddr).gem());
    }

    /// @notice Checks if the join address is one of the Ether coll. types
    /// @param _joinAddr Join address to check
    function isEthJoinAddr(address _joinAddr) internal view returns (bool) {
        // if it's dai_join_addr don't check gem() it will fail
        if (_joinAddr == 0x9759A6Ac90977b93B58547b4A71c78317f391A28) return false;

        // if coll is weth it's and eth type coll
        if (address(Join(_joinAddr).gem()) == 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2) {
            return true;
        }

        return false;
    }

    /// @notice Gets CDP info (collateral, debt)
    /// @param _manager Manager contract
    /// @param _cdpId Id of the CDP
    /// @param _ilk Ilk of the CDP
    function getCdpInfo(Manager _manager, uint _cdpId, bytes32 _ilk) public view returns (uint, uint) {
        address vat = _manager.vat();
        address urn = _manager.urns(_cdpId);

        (uint collateral, uint debt) = Vat(vat).urns(_ilk, urn);
        (,uint rate,,,) = Vat(vat).ilks(_ilk);

        return (collateral, rmul(debt, rate));
    }

    /// @notice Address that owns the DSProxy that owns the CDP
    /// @param _manager Manager contract
    /// @param _cdpId Id of the CDP
    function getOwner(Manager _manager, uint _cdpId) public view returns (address) {
        DSProxy proxy = DSProxy(uint160(_manager.owns(_cdpId)));

        return proxy.owner();
    }

    /// @notice Based on the manager type returns the address
    /// @param _managerType Type of vault manager to use
    function getManagerAddr(ManagerType _managerType) public pure returns (address) {
        if (_managerType == ManagerType.MCD) {
            return 0x5ef30b9986345249bc32d8928B7ee64DE9435E39;
        } else if (_managerType == ManagerType.BPROTOCOL) {
            return 0x3f30c2381CD8B917Dd96EB2f1A4F96D91324BBed;
        }
    }
} interface ERC20 {
    function totalSupply() external view returns (uint256 supply);

    function balanceOf(address _owner) external view returns (uint256 balance);

    function transfer(address _to, uint256 _value) external returns (bool success);

    function transferFrom(address _from, address _to, uint256 _value)
        external
        returns (bool success);

    function approve(address _spender, uint256 _value) external returns (bool success);

    function allowance(address _owner, address _spender) external view returns (uint256 remaining);

    function decimals() external view returns (uint256 digits);

    event Approval(address indexed _owner, address indexed _spender, uint256 _value);
} library Address {
    function isContract(address account) internal view returns (bool) {
        // According to EIP-1052, 0x0 is the value returned for not-yet created accounts
        // and 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470 is returned
        // for accounts without code, i.e. `keccak256('')`
        bytes32 codehash;
        bytes32 accountHash = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470;
        // solhint-disable-next-line no-inline-assembly
        assembly { codehash := extcodehash(account) }
        return (codehash != accountHash && codehash != 0x0);
    }

    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value
        (bool success, ) = recipient.call{ value: amount }("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
      return functionCall(target, data, "Address: low-level call failed");
    }

    function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
        return _functionCallWithValue(target, data, 0, errorMessage);
    }

    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    function functionCallWithValue(address target, bytes memory data, uint256 value, string memory errorMessage) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        return _functionCallWithValue(target, data, value, errorMessage);
    }

    function _functionCallWithValue(address target, bytes memory data, uint256 weiValue, string memory errorMessage) private returns (bytes memory) {
        require(isContract(target), "Address: call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.call{ value: weiValue }(data);
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly

                // solhint-disable-next-line no-inline-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
} library SafeMath {
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");

        return c;
    }

    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return sub(a, b, "SafeMath: subtraction overflow");
    }

    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        uint256 c = a - b;

        return c;
    }

    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
        // benefit is lost if 'b' is also tested.
        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
        if (a == 0) {
            return 0;
        }

        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");

        return c;
    }

    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return div(a, b, "SafeMath: division by zero");
    }

    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        uint256 c = a / b;
        // assert(a == b * c + a % b); // There is no case in which this doesn't hold

        return c;
    }

    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        return mod(a, b, "SafeMath: modulo by zero");
    }

    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b != 0, errorMessage);
        return a % b;
    }
} library SafeERC20 {
    using SafeMath for uint256;
    using Address for address;

    function safeTransfer(ERC20 token, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    function safeTransferFrom(ERC20 token, address from, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

    /**
     * @dev Deprecated. This function has issues similar to the ones found in
     * {IERC20-approve}, and its usage is discouraged.
     */
    function safeApprove(ERC20 token, address spender, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, 0));
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }

    function safeIncreaseAllowance(ERC20 token, address spender, uint256 value) internal {
        uint256 newAllowance = token.allowance(address(this), spender).add(value);
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    function safeDecreaseAllowance(ERC20 token, address spender, uint256 value) internal {
        uint256 newAllowance = token.allowance(address(this), spender).sub(value, "SafeERC20: decreased allowance below zero");
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    function _callOptionalReturn(ERC20 token, bytes memory data) private {

        bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
        if (returndata.length > 0) { // Return data is optional
            // solhint-disable-next-line max-line-length
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
} contract AdminAuth {

    using SafeERC20 for ERC20;

    address public owner;
    address public admin;

    modifier onlyOwner() {
        require(owner == msg.sender);
        _;
    }

    modifier onlyAdmin() {
        require(admin == msg.sender);
        _;
    }

    constructor() public {
        owner = 0xBc841B0dE0b93205e912CFBBd1D0c160A1ec6F00;
        admin = 0x25eFA336886C74eA8E282ac466BdCd0199f85BB9;
    }

    /// @notice Admin is set by owner first time, after that admin is super role and has permission to change owner
    /// @param _admin Address of multisig that becomes admin
    function setAdminByOwner(address _admin) public {
        require(msg.sender == owner);
        require(admin == address(0));

        admin = _admin;
    }

    /// @notice Admin is able to set new admin
    /// @param _admin Address of multisig that becomes new admin
    function setAdminByAdmin(address _admin) public {
        require(msg.sender == admin);

        admin = _admin;
    }

    /// @notice Admin is able to change owner
    /// @param _owner Address of new owner
    function setOwnerByAdmin(address _owner) public {
        require(msg.sender == admin);

        owner = _owner;
    }

    /// @notice Destroy the contract
    function kill() public onlyOwner {
        selfdestruct(payable(owner));
    }

    /// @notice  withdraw stuck funds
    function withdrawStuckFunds(address _token, uint _amount) public onlyOwner {
        if (_token == 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE) {
            payable(owner).transfer(_amount);
        } else {
            ERC20(_token).safeTransfer(owner, _amount);
        }
    }
} contract BotRegistry is AdminAuth {

    mapping (address => bool) public botList;

    constructor() public {
        botList[0x776B4a13093e30B05781F97F6A4565B6aa8BE330] = true;

        botList[0xAED662abcC4FA3314985E67Ea993CAD064a7F5cF] = true;
        botList[0xa5d330F6619d6bF892A5B87D80272e1607b3e34D] = true;
        botList[0x5feB4DeE5150B589a7f567EA7CADa2759794A90A] = true;
        botList[0x7ca06417c1d6f480d3bB195B80692F95A6B66158] = true;
    }

    function setBot(address _botAddr, bool _state) public onlyOwner {
        botList[_botAddr] = _state;
    }

} abstract contract TokenInterface {
	address public constant WETH_ADDRESS = 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2;
    
    function allowance(address, address) public virtual returns (uint256);

    function balanceOf(address) public virtual returns (uint256);

    function approve(address, uint256) public virtual;

    function transfer(address, uint256) public virtual returns (bool);

    function transferFrom(address, address, uint256) public virtual returns (bool);

    function deposit() public virtual payable;

    function withdraw(uint256) public virtual;
} interface ExchangeInterfaceV3 {
    function sell(address _srcAddr, address _destAddr, uint _srcAmount, bytes memory _additionalData) external payable returns (uint);

    function buy(address _srcAddr, address _destAddr, uint _destAmount, bytes memory _additionalData) external payable returns(uint);

    function getSellRate(address _srcAddr, address _destAddr, uint _srcAmount, bytes memory _additionalData) external returns (uint);

    function getBuyRate(address _srcAddr, address _destAddr, uint _srcAmount, bytes memory _additionalData) external returns (uint);
} contract ZrxAllowlist is AdminAuth {

    mapping (address => bool) public zrxAllowlist;
    mapping(address => bool) private nonPayableAddrs;

    constructor() public {
        zrxAllowlist[0x6958F5e95332D93D21af0D7B9Ca85B8212fEE0A5] = true;
        zrxAllowlist[0x61935CbDd02287B511119DDb11Aeb42F1593b7Ef] = true;
        zrxAllowlist[0xDef1C0ded9bec7F1a1670819833240f027b25EfF] = true;
        zrxAllowlist[0x080bf510FCbF18b91105470639e9561022937712] = true;

        nonPayableAddrs[0x080bf510FCbF18b91105470639e9561022937712] = true;
    }

    function setAllowlistAddr(address _zrxAddr, bool _state) public onlyOwner {
        zrxAllowlist[_zrxAddr] = _state;
    }

    function isZrxAddr(address _zrxAddr) public view returns (bool) {
        return zrxAllowlist[_zrxAddr];
    }

    function addNonPayableAddr(address _nonPayableAddr) public onlyOwner {
		nonPayableAddrs[_nonPayableAddr] = true;
	}

	function removeNonPayableAddr(address _nonPayableAddr) public onlyOwner {
		nonPayableAddrs[_nonPayableAddr] = false;
	}

	function isNonPayableAddr(address _addr) public view returns(bool) {
		return nonPayableAddrs[_addr];
	}
}

contract DFSExchangeData {

    // first is empty to keep the legacy order in place
    enum ExchangeType { _, OASIS, KYBER, UNISWAP, ZEROX }

    enum ActionType { SELL, BUY }

    struct OffchainData {
        address wrapper;
        address exchangeAddr;
        address allowanceTarget;
        uint256 price;
        uint256 protocolFee;
        bytes callData;
    }

    struct ExchangeData {
        address srcAddr;
        address destAddr;
        uint256 srcAmount;
        uint256 destAmount;
        uint256 minPrice;
        uint256 dfsFeeDivider; // service fee divider
        address user; // user to check special fee
        address wrapper;
        bytes wrapperData;
        OffchainData offchainData;
    }

    function packExchangeData(ExchangeData memory _exData) public pure returns(bytes memory) {
        return abi.encode(_exData);
    }

    function unpackExchangeData(bytes memory _data) public pure returns(ExchangeData memory _exData) {
        _exData = abi.decode(_data, (ExchangeData));
    }
}



abstract contract IFeeRecipient {
    function getFeeAddr() public view virtual returns (address);
    function changeWalletAddr(address _newWallet) public virtual;
} contract DFSExchangeHelper {

    string public constant ERR_OFFCHAIN_DATA_INVALID = "Offchain data invalid";

    using SafeERC20 for ERC20;

    address public constant KYBER_ETH_ADDRESS = 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE;
    address public constant EXCHANGE_WETH_ADDRESS = 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2;

    IFeeRecipient public constant _feeRecipient = IFeeRecipient(0x39C4a92Dc506300c3Ea4c67ca4CA611102ee6F2A);

    address public constant DISCOUNT_ADDRESS = 0x1b14E8D511c9A4395425314f849bD737BAF8208F;
    address public constant SAVER_EXCHANGE_REGISTRY = 0x25dd3F51e0C3c3Ff164DDC02A8E4D65Bb9cBB12D;

    address public constant ZRX_ALLOWLIST_ADDR = 0x4BA1f38427b33B8ab7Bb0490200dAE1F1C36823F;


    function getDecimals(address _token) internal view returns (uint256) {
        if (_token == KYBER_ETH_ADDRESS) return 18;

        return ERC20(_token).decimals();
    }

    function getBalance(address _tokenAddr) internal view returns (uint balance) {
        if (_tokenAddr == KYBER_ETH_ADDRESS) {
            balance = address(this).balance;
        } else {
            balance = ERC20(_tokenAddr).balanceOf(address(this));
        }
    }

    function sendLeftover(address _srcAddr, address _destAddr, address payable _to) internal {
        // send back any leftover ether or tokens
        if (address(this).balance > 0) {
            _to.transfer(address(this).balance);
        }

        if (getBalance(_srcAddr) > 0) {
            ERC20(_srcAddr).safeTransfer(_to, getBalance(_srcAddr));
        }

        if (getBalance(_destAddr) > 0) {
            ERC20(_destAddr).safeTransfer(_to, getBalance(_destAddr));
        }
    }

    /// @notice Takes a feePercentage and sends it to wallet
    /// @param _amount Dai amount of the whole trade
    /// @param _user Address of the user
    /// @param _token Address of the token
    /// @param _dfsFeeDivider Dfs fee divider
    /// @return feeAmount Amount in Dai owner earned on the fee
    function getFee(uint256 _amount, address _user, address _token, uint256 _dfsFeeDivider) internal returns (uint256 feeAmount) {
        if (_dfsFeeDivider != 0 && Discount(DISCOUNT_ADDRESS).isCustomFeeSet(_user)) {
            _dfsFeeDivider = Discount(DISCOUNT_ADDRESS).getCustomServiceFee(_user);
        }

        if (_dfsFeeDivider == 0) {
            feeAmount = 0;
        } else {
            feeAmount = _amount / _dfsFeeDivider;

            // fee can't go over 10% of the whole amount
            if (feeAmount > (_amount / 10)) {
                feeAmount = _amount / 10;
            }

            address walletAddr = _feeRecipient.getFeeAddr();

            if (_token == KYBER_ETH_ADDRESS) {
                payable(walletAddr).transfer(feeAmount);
            } else {
                ERC20(_token).safeTransfer(walletAddr, feeAmount);
            }
        }
    }

    function sliceUint(bytes memory bs, uint256 start) internal pure returns (uint256) {
        require(bs.length >= start + 32, "slicing out of range");

        uint256 x;
        assembly {
            x := mload(add(bs, add(0x20, start)))
        }

        return x;
    }

        function writeUint256(bytes memory _b, uint256 _index, uint _input) internal pure {
        if (_b.length < _index + 32) {
            revert(ERR_OFFCHAIN_DATA_INVALID);
        }

        bytes32 input = bytes32(_input);

        _index += 32;

        // Read the bytes32 from array memory
        assembly {
            mstore(add(_b, _index), input)
        }
    }

    /// @notice Converts Kybers Eth address -> Weth
    /// @param _src Input address
    function ethToWethAddr(address _src) internal pure returns (address) {
        return _src == KYBER_ETH_ADDRESS ? EXCHANGE_WETH_ADDRESS : _src;
    }
} contract SaverExchangeRegistry is AdminAuth {

	mapping(address => bool) private wrappers;

	constructor() public {
		wrappers[0x880A845A85F843a5c67DB2061623c6Fc3bB4c511] = true;
		wrappers[0x4c9B55f2083629A1F7aDa257ae984E03096eCD25] = true;
		wrappers[0x42A9237b872368E1bec4Ca8D26A928D7d39d338C] = true;
	}

	function addWrapper(address _wrapper) public onlyOwner {
		wrappers[_wrapper] = true;
	}

	function removeWrapper(address _wrapper) public onlyOwner {
		wrappers[_wrapper] = false;
	}

	function isWrapper(address _wrapper) public view returns(bool) {
		return wrappers[_wrapper];
	}
} 



abstract contract OffchainWrapperInterface is DFSExchangeData {
    function takeOrder(
        ExchangeData memory _exData,
        ActionType _type
    ) virtual public payable returns (bool success, uint256);
}









contract DFSExchangeCore is DFSExchangeHelper, DSMath, DFSExchangeData {

    string public constant ERR_SLIPPAGE_HIT = "Slippage hit";
    string public constant ERR_DEST_AMOUNT_MISSING = "Dest amount missing";
    string public constant ERR_WRAPPER_INVALID = "Wrapper invalid";
    string public constant ERR_NOT_ZEROX_EXCHANGE = "Zerox exchange invalid";

    /// @notice Internal method that preforms a sell on 0x/on-chain
    /// @dev Usefull for other DFS contract to integrate for exchanging
    /// @param exData Exchange data struct
    /// @return (address, uint) Address of the wrapper used and destAmount
    function _sell(ExchangeData memory exData) internal returns (address, uint) {

        address wrapper;
        uint swapedTokens;
        bool success;

        // if selling eth, convert to weth
        if (exData.srcAddr == KYBER_ETH_ADDRESS) {
            exData.srcAddr = ethToWethAddr(exData.srcAddr);
            TokenInterface(EXCHANGE_WETH_ADDRESS).deposit{value: exData.srcAmount}();
        }

        exData.srcAmount -= getFee(exData.srcAmount, exData.user, exData.srcAddr, exData.dfsFeeDivider);

        // Try 0x first and then fallback on specific wrapper
        if (exData.offchainData.price > 0) {
            (success, swapedTokens) = takeOrder(exData, ActionType.SELL);

            if (success) {
                wrapper = exData.offchainData.exchangeAddr;
            }
        }

        // fallback to desired wrapper if 0x failed
        if (!success) {
            swapedTokens = saverSwap(exData, ActionType.SELL);
            wrapper = exData.wrapper;
        }

        // if anything is left in weth, pull it to user as eth
        if (getBalance(EXCHANGE_WETH_ADDRESS) > 0) {
            TokenInterface(EXCHANGE_WETH_ADDRESS).withdraw(
                TokenInterface(EXCHANGE_WETH_ADDRESS).balanceOf(address(this))
            );
        }

        if (exData.destAddr == EXCHANGE_WETH_ADDRESS) {
            require(getBalance(KYBER_ETH_ADDRESS) >= wmul(exData.minPrice, exData.srcAmount), ERR_SLIPPAGE_HIT);
        } else {
            require(getBalance(exData.destAddr) >= wmul(exData.minPrice, exData.srcAmount), ERR_SLIPPAGE_HIT);
        }

        return (wrapper, swapedTokens);
    }

    /// @notice Internal method that preforms a buy on 0x/on-chain
    /// @dev Usefull for other DFS contract to integrate for exchanging
    /// @param exData Exchange data struct
    /// @return (address, uint) Address of the wrapper used and srcAmount
    function _buy(ExchangeData memory exData) internal returns (address, uint) {

        address wrapper;
        uint swapedTokens;
        bool success;

        require(exData.destAmount != 0, ERR_DEST_AMOUNT_MISSING);

        exData.srcAmount -= getFee(exData.srcAmount, exData.user, exData.srcAddr, exData.dfsFeeDivider);

        // if selling eth, convert to weth
        if (exData.srcAddr == KYBER_ETH_ADDRESS) {
            exData.srcAddr = ethToWethAddr(exData.srcAddr);
            TokenInterface(EXCHANGE_WETH_ADDRESS).deposit{value: exData.srcAmount}();
        }

        if (exData.offchainData.price > 0) {
            (success, swapedTokens) = takeOrder(exData, ActionType.BUY);

            if (success) {
                wrapper = exData.offchainData.exchangeAddr;
            }
        }

        // fallback to desired wrapper if 0x failed
        if (!success) {
            swapedTokens = saverSwap(exData, ActionType.BUY);
            wrapper = exData.wrapper;
        }

        // if anything is left in weth, pull it to user as eth
        if (getBalance(EXCHANGE_WETH_ADDRESS) > 0) {
            TokenInterface(EXCHANGE_WETH_ADDRESS).withdraw(
                TokenInterface(EXCHANGE_WETH_ADDRESS).balanceOf(address(this))
            );
        }

        if (exData.destAddr == EXCHANGE_WETH_ADDRESS) {
            require(getBalance(KYBER_ETH_ADDRESS) >= exData.destAmount, ERR_SLIPPAGE_HIT);
        } else {
            require(getBalance(exData.destAddr) >= exData.destAmount, ERR_SLIPPAGE_HIT);
        }

        return (wrapper, getBalance(exData.destAddr));
    }

    /// @notice Takes order from 0x and returns bool indicating if it is successful
    /// @param _exData Exchange data
    function takeOrder(
        ExchangeData memory _exData,
        ActionType _type
    ) private returns (bool success, uint256) {
        if (!ZrxAllowlist(ZRX_ALLOWLIST_ADDR).isZrxAddr(_exData.offchainData.exchangeAddr)) {
            return (false, 0);
        }

        if (!SaverExchangeRegistry(SAVER_EXCHANGE_REGISTRY).isWrapper(_exData.offchainData.wrapper)) {
            return (false, 0);
        }

        // send src amount
        ERC20(_exData.srcAddr).safeTransfer(_exData.offchainData.wrapper, _exData.srcAmount);

        return OffchainWrapperInterface(_exData.offchainData.wrapper).takeOrder{value: _exData.offchainData.protocolFee}(_exData, _type);
    }

    /// @notice Calls wraper contract for exchage to preform an on-chain swap
    /// @param _exData Exchange data struct
    /// @param _type Type of action SELL|BUY
    /// @return swapedTokens For Sell that the destAmount, for Buy thats the srcAmount
    function saverSwap(ExchangeData memory _exData, ActionType _type) internal returns (uint swapedTokens) {
        require(SaverExchangeRegistry(SAVER_EXCHANGE_REGISTRY).isWrapper(_exData.wrapper), ERR_WRAPPER_INVALID);

        ERC20(_exData.srcAddr).safeTransfer(_exData.wrapper, _exData.srcAmount);

        if (_type == ActionType.SELL) {
            swapedTokens = ExchangeInterfaceV3(_exData.wrapper).
                    sell(_exData.srcAddr, _exData.destAddr, _exData.srcAmount, _exData.wrapperData);
        } else {
            swapedTokens = ExchangeInterfaceV3(_exData.wrapper).
                    buy(_exData.srcAddr, _exData.destAddr, _exData.destAmount, _exData.wrapperData);
        }
    }

    // solhint-disable-next-line no-empty-blocks
    receive() external virtual payable {}
}













/// @title Implements Boost and Repay for MCD CDPs
contract MCDSaverProxy is DFSExchangeCore, MCDSaverProxyHelper {
    uint256 public constant MANUAL_SERVICE_FEE = 400; // 0.25% Fee
    uint256 public constant AUTOMATIC_SERVICE_FEE = 333; // 0.3% Fee

    bytes32 public constant ETH_ILK =
        0x4554482d41000000000000000000000000000000000000000000000000000000;

    address public constant VAT_ADDRESS = 0x35D1b3F3D7966A1DFe207aa4514C12a259A0492B;
    address public constant SPOTTER_ADDRESS = 0x65C79fcB50Ca1594B025960e539eD7A9a6D434A3;
    address public constant DAI_JOIN_ADDRESS = 0x9759A6Ac90977b93B58547b4A71c78317f391A28;
    address public constant JUG_ADDRESS = 0x19c0976f590D67707E62397C87829d896Dc0f1F1;
    address public constant DAI_ADDRESS = 0x6B175474E89094C44Da98b954EedeAC495271d0F;

    address public constant BOT_REGISTRY_ADDRESS = 0x637726f8b08a7ABE3aE3aCaB01A80E2d8ddeF77B;

    Vat public constant vat = Vat(VAT_ADDRESS);
    DaiJoin public constant daiJoin = DaiJoin(DAI_JOIN_ADDRESS);
    Spotter public constant spotter = Spotter(SPOTTER_ADDRESS);

    DefisaverLogger public constant logger =
        DefisaverLogger(0x5c55B921f590a89C1Ebe84dF170E655a82b62126);

    /// @notice Repay - draws collateral, converts to Dai and repays the debt
    /// @dev Must be called by the DSProxy contract that owns the CDP
    function repay(
        ExchangeData memory _exchangeData,
        uint256 _cdpId,
        uint256 _gasCost,
        address _joinAddr,
        ManagerType _managerType
    ) public payable {
        address managerAddr = getManagerAddr(_managerType);

        address user = getOwner(Manager(managerAddr), _cdpId);
        bytes32 ilk = Manager(managerAddr).ilks(_cdpId);

        drawCollateral(managerAddr, _cdpId, _joinAddr, _exchangeData.srcAmount, true);

        _exchangeData.user = user;
        _exchangeData.dfsFeeDivider = isAutomation() ? AUTOMATIC_SERVICE_FEE : MANUAL_SERVICE_FEE;
        (, uint256 daiAmount) = _sell(_exchangeData);

        daiAmount = sub(daiAmount, takeFee(_gasCost, daiAmount));

        paybackDebt(managerAddr, _cdpId, ilk, daiAmount, user);

        // if there is some eth left (0x fee), return it to user
        if (address(this).balance > 0) {
            tx.origin.transfer(address(this).balance);
        }

        logger.Log(
            address(this),
            msg.sender,
            "MCDRepay",
            abi.encode(_cdpId, user, _exchangeData.srcAmount, daiAmount)
        );
    }

    /// @notice Boost - draws Dai, converts to collateral and adds to CDP
    /// @dev Must be called by the DSProxy contract that owns the CDP
    function boost(
        ExchangeData memory _exchangeData,
        uint256 _cdpId,
        uint256 _gasCost,
        address _joinAddr,
        ManagerType _managerType
    ) public payable {
        address managerAddr = getManagerAddr(_managerType);

        address user = getOwner(Manager(managerAddr), _cdpId);
        bytes32 ilk = Manager(managerAddr).ilks(_cdpId);

        uint256 daiDrawn = drawDai(managerAddr, _cdpId, ilk, _exchangeData.srcAmount);

        _exchangeData.user = user;
        _exchangeData.dfsFeeDivider = isAutomation() ? AUTOMATIC_SERVICE_FEE : MANUAL_SERVICE_FEE;
        _exchangeData.srcAmount = sub(daiDrawn, takeFee(_gasCost, daiDrawn));
        (, uint256 swapedColl) = _sell(_exchangeData);

        addCollateral(managerAddr, _cdpId, _joinAddr, swapedColl);

        // if there is some eth left (0x fee), return it to the caller
        if (address(this).balance > 0) {
            tx.origin.transfer(address(this).balance);
        }

        logger.Log(
            address(this),
            msg.sender,
            "MCDBoost",
            abi.encode(_cdpId, user, _exchangeData.srcAmount, swapedColl)
        );
    }

    /// @notice Draws Dai from the CDP
    /// @dev If _daiAmount is bigger than max available we'll draw max
    /// @param _managerAddr Address of the CDP Manager
    /// @param _cdpId Id of the CDP
    /// @param _ilk Ilk of the CDP
    /// @param _daiAmount Amount of Dai to draw
    function drawDai(
        address _managerAddr,
        uint256 _cdpId,
        bytes32 _ilk,
        uint256 _daiAmount
    ) internal returns (uint256) {
        uint256 rate = Jug(JUG_ADDRESS).drip(_ilk);
        uint256 daiVatBalance = vat.dai(Manager(_managerAddr).urns(_cdpId));

        uint256 maxAmount = getMaxDebt(_managerAddr, _cdpId, _ilk);

        if (_daiAmount >= maxAmount) {
            _daiAmount = sub(maxAmount, 1);
        }

        Manager(_managerAddr).frob(
            _cdpId,
            int256(0),
            normalizeDrawAmount(_daiAmount, rate, daiVatBalance)
        );
        Manager(_managerAddr).move(_cdpId, address(this), toRad(_daiAmount));

        if (vat.can(address(this), address(DAI_JOIN_ADDRESS)) == 0) {
            vat.hope(DAI_JOIN_ADDRESS);
        }

        DaiJoin(DAI_JOIN_ADDRESS).exit(address(this), _daiAmount);

        return _daiAmount;
    }

    /// @notice Adds collateral to the CDP
    /// @param _managerAddr Address of the CDP Manager
    /// @param _cdpId Id of the CDP
    /// @param _joinAddr Address of the join contract for the CDP collateral
    /// @param _amount Amount of collateral to add
    function addCollateral(
        address _managerAddr,
        uint256 _cdpId,
        address _joinAddr,
        uint256 _amount
    ) internal {
        int256 convertAmount = 0;

        if (isEthJoinAddr(_joinAddr)) {
            Join(_joinAddr).gem().deposit{value: _amount}();
            convertAmount = toPositiveInt(_amount);
        } else {
            convertAmount = toPositiveInt(convertTo18(_joinAddr, _amount));
        }

        ERC20(address(Join(_joinAddr).gem())).safeApprove(_joinAddr, _amount);

        Join(_joinAddr).join(address(this), _amount);

        vat.frob(
            Manager(_managerAddr).ilks(_cdpId),
            Manager(_managerAddr).urns(_cdpId),
            address(this),
            address(this),
            convertAmount,
            0
        );
    }

    /// @notice Draws collateral and returns it to DSProxy
    /// @param _managerAddr Address of the CDP Manager
    /// @dev If _amount is bigger than max available we'll draw max
    /// @param _cdpId Id of the CDP
    /// @param _joinAddr Address of the join contract for the CDP collateral
    /// @param _amount Amount of collateral to draw
    /// @param _toEth If we want wrapped or plain eth to be returned
    function drawCollateral(
        address _managerAddr,
        uint256 _cdpId,
        address _joinAddr,
        uint256 _amount,
        bool _toEth
    ) internal returns (uint256) {
        uint256 frobAmount = _amount;

        uint256 tokenDecimal = Join(_joinAddr).dec();

        require(tokenDecimal <= 18, "Token decimals too big");

        if (tokenDecimal != 18) {
            frobAmount = _amount * (10**(18 - tokenDecimal));
        }

        Manager(_managerAddr).frob(_cdpId, -toPositiveInt(frobAmount), 0);
        Manager(_managerAddr).flux(_cdpId, address(this), frobAmount);

        Join(_joinAddr).exit(address(this), _amount);

        if (isEthJoinAddr(_joinAddr) && _toEth) {
            Join(_joinAddr).gem().withdraw(_amount); // Weth -> Eth
        }

        return _amount;
    }

    /// @notice Paybacks Dai debt
    /// @param _managerAddr Address of the CDP Manager
    /// @dev If the _daiAmount is bigger than the whole debt, returns extra Dai
    /// @param _cdpId Id of the CDP
    /// @param _ilk Ilk of the CDP
    /// @param _daiAmount Amount of Dai to payback
    /// @param _owner Address that owns the DSProxy that owns the CDP
    function paybackDebt(
        address _managerAddr,
        uint256 _cdpId,
        bytes32 _ilk,
        uint256 _daiAmount,
        address _owner
    ) internal {
        address urn = Manager(_managerAddr).urns(_cdpId);

        uint256 wholeDebt = getAllDebt(VAT_ADDRESS, urn, urn, _ilk);

        if (_daiAmount > wholeDebt) {
            ERC20(DAI_ADDRESS).transfer(_owner, sub(_daiAmount, wholeDebt));
            _daiAmount = wholeDebt;
        }

        if (ERC20(DAI_ADDRESS).allowance(address(this), DAI_JOIN_ADDRESS) == 0) {
            ERC20(DAI_ADDRESS).approve(DAI_JOIN_ADDRESS, uint256(-1));
        }

        daiJoin.join(urn, _daiAmount);

        Manager(_managerAddr).frob(_cdpId, 0, normalizePaybackAmount(VAT_ADDRESS, urn, _ilk));
    }

    /// @notice Gets the maximum amount of collateral available to draw
    /// @param _managerAddr Address of the CDP Manager
    /// @param _cdpId Id of the CDP
    /// @param _ilk Ilk of the CDP
    /// @param _joinAddr Joind address of collateral
    /// @dev Substracts 10 wei to aviod rounding error later on
    function getMaxCollateral(
        address _managerAddr,
        uint256 _cdpId,
        bytes32 _ilk,
        address _joinAddr
    ) public view returns (uint256) {
        uint256 price = getPrice(_ilk);

        (uint256 collateral, uint256 debt) = getCdpInfo(Manager(_managerAddr), _cdpId, _ilk);

        (, uint256 mat) = Spotter(SPOTTER_ADDRESS).ilks(_ilk);

        uint256 maxCollateral = sub(collateral, (div(mul(mat, debt), price)));

        uint256 tokenDecimal = Join(_joinAddr).dec();

        require(tokenDecimal <= 18, "Token decimals too big");

        uint256 normalizeMaxCollateral = maxCollateral / (10**(18 - tokenDecimal));

        // take one percent due to precision issues
        return (normalizeMaxCollateral * 99) / 100;
    }

    /// @notice Gets the maximum amount of debt available to generate
    /// @param _managerAddr Address of the CDP Manager
    /// @param _cdpId Id of the CDP
    /// @param _ilk Ilk of the CDP
    /// @dev Substracts 10 wei to aviod rounding error later on
    function getMaxDebt(
        address _managerAddr,
        uint256 _cdpId,
        bytes32 _ilk
    ) public view virtual returns (uint256) {
        uint256 price = getPrice(_ilk);

        (, uint256 mat) = spotter.ilks(_ilk);
        (uint256 collateral, uint256 debt) = getCdpInfo(Manager(_managerAddr), _cdpId, _ilk);

        return sub(sub(div(mul(collateral, price), mat), debt), 10);
    }

    /// @notice Gets a price of the asset
    /// @param _ilk Ilk of the CDP
    function getPrice(bytes32 _ilk) public view returns (uint256) {
        (, uint256 mat) = spotter.ilks(_ilk);
        (, , uint256 spot, , ) = vat.ilks(_ilk);

        return rmul(rmul(spot, spotter.par()), mat);
    }

    function isAutomation() internal view returns (bool) {
        return BotRegistry(BOT_REGISTRY_ADDRESS).botList(tx.origin);
    }

    function takeFee(uint256 _gasCost, uint256 _amount) internal returns (uint256) {
        if (_gasCost > 0) {
            uint256 ethDaiPrice = getPrice(ETH_ILK);
            uint256 feeAmount = rmul(_gasCost, ethDaiPrice);

            if (feeAmount > _amount / 5) {
                feeAmount = _amount / 5;
            }

            address walletAddr = _feeRecipient.getFeeAddr();

            ERC20(DAI_ADDRESS).safeTransfer(walletAddr, feeAmount);

            return feeAmount;
        }

        return 0;
    }
}

interface ILendingPoolAddressesProviderV2 {
  event LendingPoolUpdated(address indexed newAddress);
  event ConfigurationAdminUpdated(address indexed newAddress);
  event EmergencyAdminUpdated(address indexed newAddress);
  event LendingPoolConfiguratorUpdated(address indexed newAddress);
  event LendingPoolCollateralManagerUpdated(address indexed newAddress);
  event PriceOracleUpdated(address indexed newAddress);
  event LendingRateOracleUpdated(address indexed newAddress);
  event ProxyCreated(bytes32 id, address indexed newAddress);
  event AddressSet(bytes32 id, address indexed newAddress, bool hasProxy);

  function setAddress(bytes32 id, address newAddress) external;

  function setAddressAsProxy(bytes32 id, address impl) external;

  function getAddress(bytes32 id) external view returns (address);

  function getLendingPool() external view returns (address);

  function setLendingPoolImpl(address pool) external;

  function getLendingPoolConfigurator() external view returns (address);

  function setLendingPoolConfiguratorImpl(address configurator) external;

  function getLendingPoolCollateralManager() external view returns (address);

  function setLendingPoolCollateralManager(address manager) external;

  function getPoolAdmin() external view returns (address);

  function setPoolAdmin(address admin) external;

  function getEmergencyAdmin() external view returns (address);

  function setEmergencyAdmin(address admin) external;

  function getPriceOracle() external view returns (address);

  function setPriceOracle(address priceOracle) external;

  function getLendingRateOracle() external view returns (address);

  function setLendingRateOracle(address lendingRateOracle) external;
}





/// @title Receiver of Aave flash loan and performs the fl repay/boost logic
contract MCDSaverFlashLoan is MCDSaverProxy, AdminAuth {

    address internal constant AAVE_MARKET_ADDR = 0xB53C1a33016B2DC2fF3653530bfF1848a515c8c5;
    address internal constant BALANCER_VAULT_ADDR = 0xBA12222222228d8Ba445958a75a0704d566BF2C8;

    struct SaverData {
        uint256 cdpId;
        uint256 gasCost;
        uint256 loanAmount;
        uint256 fee;
        address joinAddr;
        ManagerType managerType;
    }

    // Balancer fl callback
     function receiveFlashLoan(
        address[] memory _tokens,
        uint256[] memory _amounts,
        uint256[] memory _fees,
        bytes memory _params
    ) external {
         require(msg.sender == BALANCER_VAULT_ADDR, "Only balancer can call");

        _receiveFl(_tokens[0], _amounts[0], _fees[0], _params);

        ERC20(_tokens[0]).safeTransfer(address(BALANCER_VAULT_ADDR), add(_amounts[0], _fees[0]));
    }

    // AaveV2 fl callback
     function executeOperation(
        address[] memory _assets,
        uint256[] memory _amounts,
        uint256[] memory _fees,
        address,
        bytes memory _params
    ) public returns (bool) {
        address lendingPool = ILendingPoolAddressesProviderV2(AAVE_MARKET_ADDR).getLendingPool();
        require(msg.sender == lendingPool, "Only aave pool can call");

        _receiveFl(_assets[0], _amounts[0], _fees[0], _params);

        ERC20(_assets[0]).safeApprove(lendingPool, add(_amounts[0], _fees[0]));

        return true;
    }

    /// @notice Gets called by fl entry point functions
    function _receiveFl(
        address _tokenAddr,
        uint256 _amount,
        uint256 _fee,
        bytes memory _params
    ) internal {
        (
            bytes memory exDataBytes,
            uint256 cdpId,
            uint256 gasCost,
            address joinAddr,
            bool isRepay,
            uint8 managerType
        ) = abi.decode(_params, (bytes, uint256, uint256, address, bool, uint8));

        ExchangeData memory exchangeData = unpackExchangeData(exDataBytes);

        // we get weth from FL, withdraw it to weth
        if (_tokenAddr == EXCHANGE_WETH_ADDRESS) {
            TokenInterface(EXCHANGE_WETH_ADDRESS).withdraw(_amount);
        }

        SaverData memory saverData = SaverData({
            cdpId: cdpId,
            gasCost: gasCost,
            loanAmount: _amount,
            fee: _fee,
            joinAddr: joinAddr,
            managerType: ManagerType(managerType)
        });

        if (isRepay) {
            repayWithLoan(exchangeData, saverData);
        } else {
            boostWithLoan(exchangeData, saverData);
        }

        // if there is some eth left (0x fee), return it to user
        if (address(this).balance > 0) {
            tx.origin.transfer(address(this).balance);
        }
    }

    function boostWithLoan(ExchangeData memory _exchangeData, SaverData memory _saverData)
        internal
    {
        address managerAddr = getManagerAddr(_saverData.managerType);
        address user = getOwner(Manager(managerAddr), _saverData.cdpId);

        // Draw users Dai
        uint256 maxDebt = getMaxDebt(
            managerAddr,
            _saverData.cdpId,
            Manager(managerAddr).ilks(_saverData.cdpId)
        );
        uint256 daiDrawn = drawDai(
            managerAddr,
            _saverData.cdpId,
            Manager(managerAddr).ilks(_saverData.cdpId),
            maxDebt
        );

        // Swap
        _exchangeData.srcAmount = sub(
            add(daiDrawn, _saverData.loanAmount),
            takeFee(_saverData.gasCost, add(daiDrawn, _saverData.loanAmount))
        );

        _exchangeData.user = user;
        _exchangeData.dfsFeeDivider = isAutomation() ? AUTOMATIC_SERVICE_FEE : MANUAL_SERVICE_FEE;
        (, uint256 swapedAmount) = _sell(_exchangeData);

        // Return collateral
        addCollateral(managerAddr, _saverData.cdpId, _saverData.joinAddr, swapedAmount);

        // Draw Dai to repay the flash loan
        drawDai(
            managerAddr,
            _saverData.cdpId,
            Manager(managerAddr).ilks(_saverData.cdpId),
            add(_saverData.loanAmount, _saverData.fee)
        );


        logger.Log(
            address(this),
            msg.sender,
            "MCDFlashBoost",
            abi.encode(_saverData.cdpId, user, _exchangeData.srcAmount, swapedAmount)
        );
    }

    function repayWithLoan(ExchangeData memory _exchangeData, SaverData memory _saverData)
        internal
    {
        address managerAddr = getManagerAddr(_saverData.managerType);

        address user = getOwner(Manager(managerAddr), _saverData.cdpId);
        bytes32 ilk = Manager(managerAddr).ilks(_saverData.cdpId);

        // Draw collateral
        uint256 maxColl = getMaxCollateral(managerAddr, _saverData.cdpId, ilk, _saverData.joinAddr);
        uint256 collDrawn = drawCollateral(
            managerAddr,
            _saverData.cdpId,
            _saverData.joinAddr,
            maxColl,
            true
        );

        // Swap
        _exchangeData.srcAmount = add(_saverData.loanAmount, collDrawn);
        _exchangeData.user = user;
        _exchangeData.dfsFeeDivider = isAutomation() ? AUTOMATIC_SERVICE_FEE : MANUAL_SERVICE_FEE;
        (, uint256 paybackAmount) = _sell(_exchangeData);

        paybackAmount = sub(paybackAmount, takeFee(_saverData.gasCost, paybackAmount));

        // Payback the debt
        paybackDebt(managerAddr, _saverData.cdpId, ilk, paybackAmount, user);

        // Draw collateral to repay the flash loan
        drawCollateral(
            managerAddr,
            _saverData.cdpId,
            _saverData.joinAddr,
            add(_saverData.loanAmount, _saverData.fee),
            false
        );


        logger.Log(
            address(this),
            msg.sender,
            "MCDFlashRepay",
            abi.encode(_saverData.cdpId, user, _exchangeData.srcAmount, paybackAmount)
        );
    }

    receive() external payable override(DFSExchangeCore) {}
}

{
  "compilationTarget": {
    "MCDSaverFlashLoan.sol": "MCDSaverFlashLoan"
  },
  "evmVersion": "istanbul",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "ipfs"
  },
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "remappings": []
}