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•  contract MainnetAuthAddresses
•  contract AuthHelper is MainnetAuth ...
•  contract AdminVault is AuthHelper
•    - function changeOwner(address _owner)
•    - function changeAdmin(address _admin)
• interface IERC20
•    - function name()
•    - function symbol()
•    - function decimals()
•    - function totalSupply()
•    - function balanceOf(address _owner)
•    - function transfer(address _to, uint25 ...
•    - function transferFrom(
•    - function approve(address _spender, ui ...
•    - function allowance(address _owner, ad ...
• library Address
•    - function isContract(address account)
•    - function sendValue(address payable re ...
•    - function functionCall(address target, ...
•    - function functionCall(
•    - function functionCallWithValue(
• functionCallWithValue(target, data, v ...
•    - function functionCallWithValue(
•    - function _functionCallWithValue(
• library SafeERC20
•    - function safeTransfer(IERC20 token, a ...
•    - function safeTransferFrom(IERC20 toke ...
•    - function safeApprove(IERC20 token, ad ...
•    - function _callOptionalReturn(IERC20 t ...
•    - function _callOptionalReturnBool(IERC ...
•  contract AdminAuth is AuthHelper
•    - function withdrawStuckFunds(address _ ...
•    - function kill()
•  contract Discount is AdminAuth
•    - function reenableServiceFee(address _ ...
•    - function disableServiceFee(address _w ...
•    - function allowance(address, address)
•    - function balanceOf(address)
•    - function approve(address, uint256)
•    - function transfer(address, uint256)
•    - function transferFrom(
•    - function deposit()
•    - function withdraw(uint256)
• library TokenUtils
•    - function approveToken(
•    - function pullTokensIfNeeded(
•    - function withdrawTokens(
•    - function depositWeth(uint256 _amount)
•    - function withdrawWeth(uint256 _amount ...
•    - function getBalance(address _tokenAdd ...
•    - function getTokenDecimals(address _to ...
•  contract DFSExchangeHelper
•    - function sendLeftover(
•    - function sliceUint(bytes memory bs, u ...
•    - function writeUint256(
•  contract DFSExchangeData
•    - function takeOrder(
•  contract ParaswapWrapper is IOffch ... *
•    - function takeOrder(

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/**
 *Submitted for verification at Etherscan.io on 2024-03-14
*/

// SPDX-License-Identifier: MIT
pragma solidity =0.8.10;










contract MainnetAuthAddresses {
    address internal constant ADMIN_VAULT_ADDR = 0xCCf3d848e08b94478Ed8f46fFead3008faF581fD;
    address internal constant DSGUARD_FACTORY_ADDRESS = 0x5a15566417e6C1c9546523066500bDDBc53F88C7;
    address internal constant ADMIN_ADDR = 0x25eFA336886C74eA8E282ac466BdCd0199f85BB9; // USED IN ADMIN VAULT CONSTRUCTOR
    address internal constant PROXY_AUTH_ADDRESS = 0x149667b6FAe2c63D1B4317C716b0D0e4d3E2bD70;
    address internal constant MODULE_AUTH_ADDRESS = 0x7407974DDBF539e552F1d051e44573090912CC3D;
}







contract AuthHelper is MainnetAuthAddresses {
}








contract AdminVault is AuthHelper {
    address public owner;
    address public admin;

    error SenderNotAdmin();

    constructor() {
        owner = msg.sender;
        admin = ADMIN_ADDR;
    }

    /// @notice Admin is able to change owner
    /// @param _owner Address of new owner
    function changeOwner(address _owner) public {
        if (admin != msg.sender){
            revert SenderNotAdmin();
        }
        owner = _owner;
    }

    /// @notice Admin is able to set new admin
    /// @param _admin Address of multisig that becomes new admin
    function changeAdmin(address _admin) public {
        if (admin != msg.sender){
            revert SenderNotAdmin();
        }
        admin = _admin;
    }

}







interface IERC20 {
    function name() external view returns (string memory);
    function symbol() external view returns (string memory);
    function decimals() external view returns (uint256 digits);
    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);

    event Approval(address indexed _owner, address indexed _spender, uint256 _value);
}







library Address {
    //insufficient balance
    error InsufficientBalance(uint256 available, uint256 required);
    //unable to send value, recipient may have reverted
    error SendingValueFail();
    //insufficient balance for call
    error InsufficientBalanceForCall(uint256 available, uint256 required);
    //call to non-contract
    error NonContractCall();
    
    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 {
        uint256 balance = address(this).balance;
        if (balance < amount){
            revert InsufficientBalance(balance, amount);
        }

        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value
        (bool success, ) = recipient.call{value: amount}("");
        if (!(success)){
            revert SendingValueFail();
        }
    }

    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) {
        uint256 balance = address(this).balance;
        if (balance < value){
            revert InsufficientBalanceForCall(balance, value);
        }
        return _functionCallWithValue(target, data, value, errorMessage);
    }

    function _functionCallWithValue(
        address target,
        bytes memory data,
        uint256 weiValue,
        string memory errorMessage
    ) private returns (bytes memory) {
        if (!(isContract(target))){
            revert NonContractCall();
        }

        // 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 SafeERC20 {
    using Address for address;

    /**
     * @dev Transfer `value` amount of `token` from the calling contract to `to`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeTransfer(IERC20 token, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    /**
     * @dev Transfer `value` amount of `token` from `from` to `to`, spending the approval given by `from` to the
     * calling contract. If `token` returns no value, non-reverting calls are assumed to be successful.
     */
    function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

    /**
     * @dev Set the calling contract's allowance toward `spender` to `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful. Compatible with tokens that require the approval to be set to
     * 0 before setting it to a non-zero value.
     */
    function safeApprove(IERC20 token, address spender, uint256 value) internal {
        bytes memory approvalCall = abi.encodeWithSelector(token.approve.selector, spender, value);

        if (!_callOptionalReturnBool(token, approvalCall)) {
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, 0));
            _callOptionalReturn(token, approvalCall);
        }
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We use {Address-functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.

        bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
        require(returndata.length == 0 || abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     *
     * This is a variant of {_callOptionalReturn} that silents catches all reverts and returns a bool instead.
     */
    function _callOptionalReturnBool(IERC20 token, bytes memory data) private returns (bool) {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We cannot use {Address-functionCall} here since this should return false
        // and not revert is the subcall reverts.

        (bool success, bytes memory returndata) = address(token).call(data);
        return success && (returndata.length == 0 || abi.decode(returndata, (bool))) && address(token).code.length > 0;
    }
}










contract AdminAuth is AuthHelper {
    using SafeERC20 for IERC20;

    AdminVault public constant adminVault = AdminVault(ADMIN_VAULT_ADDR);

    error SenderNotOwner();
    error SenderNotAdmin();

    modifier onlyOwner() {
        if (adminVault.owner() != msg.sender){
            revert SenderNotOwner();
        }
        _;
    }

    modifier onlyAdmin() {
        if (adminVault.admin() != msg.sender){
            revert SenderNotAdmin();
        }
        _;
    }

    /// @notice withdraw stuck funds
    function withdrawStuckFunds(address _token, address _receiver, uint256 _amount) public onlyOwner {
        if (_token == 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE) {
            payable(_receiver).transfer(_amount);
        } else {
            IERC20(_token).safeTransfer(_receiver, _amount);
        }
    }

    /// @notice Destroy the contract
    /// @dev Deprecated method, selfdestruct will soon just send eth
    function kill() public onlyAdmin {
        selfdestruct(payable(msg.sender));
    }
}







contract Discount is AdminAuth{
    mapping(address => bool) public serviceFeesDisabled;

    function reenableServiceFee(address _wallet) public onlyOwner{
        serviceFeesDisabled[_wallet] = false;
    }

    function disableServiceFee(address _wallet) public onlyOwner{
        serviceFeesDisabled[_wallet] = true;
    }
}







abstract contract IWETH {
    function allowance(address, address) public virtual view returns (uint256);

    function balanceOf(address) public virtual view 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 payable virtual;

    function withdraw(uint256) public virtual;
}








library TokenUtils {
    using SafeERC20 for IERC20;

    address public constant WETH_ADDR = 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2;
    address public constant ETH_ADDR = 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE;

    /// @dev Only approves the amount if allowance is lower than amount, does not decrease allowance
    function approveToken(
        address _tokenAddr,
        address _to,
        uint256 _amount
    ) internal {
        if (_tokenAddr == ETH_ADDR) return;

        if (IERC20(_tokenAddr).allowance(address(this), _to) < _amount) {
            IERC20(_tokenAddr).safeApprove(_to, _amount);
        }
    }

    function pullTokensIfNeeded(
        address _token,
        address _from,
        uint256 _amount
    ) internal returns (uint256) {
        // handle max uint amount
        if (_amount == type(uint256).max) {
            _amount = getBalance(_token, _from);
        }

        if (_from != address(0) && _from != address(this) && _token != ETH_ADDR && _amount != 0) {
            IERC20(_token).safeTransferFrom(_from, address(this), _amount);
        }

        return _amount;
    }

    function withdrawTokens(
        address _token,
        address _to,
        uint256 _amount
    ) internal returns (uint256) {
        if (_amount == type(uint256).max) {
            _amount = getBalance(_token, address(this));
        }

        if (_to != address(0) && _to != address(this) && _amount != 0) {
            if (_token != ETH_ADDR) {
                IERC20(_token).safeTransfer(_to, _amount);
            } else {
                (bool success, ) = _to.call{value: _amount}("");
                require(success, "Eth send fail");
            }
        }

        return _amount;
    }

    function depositWeth(uint256 _amount) internal {
        IWETH(WETH_ADDR).deposit{value: _amount}();
    }

    function withdrawWeth(uint256 _amount) internal {
        IWETH(WETH_ADDR).withdraw(_amount);
    }

    function getBalance(address _tokenAddr, address _acc) internal view returns (uint256) {
        if (_tokenAddr == ETH_ADDR) {
            return _acc.balance;
        } else {
            return IERC20(_tokenAddr).balanceOf(_acc);
        }
    }

    function getTokenDecimals(address _token) internal view returns (uint256) {
        if (_token == ETH_ADDR) return 18;

        return IERC20(_token).decimals();
    }
}








contract DFSExchangeHelper {
    
    using TokenUtils for address;
    
    error InvalidOffchainData();
    error OutOfRangeSlicingError();
    //Order success but amount 0
    error ZeroTokensSwapped();

    using SafeERC20 for IERC20;

    function sendLeftover(
        address _srcAddr,
        address _destAddr,
        address payable _to
    ) internal {
        // clean out any eth leftover
        TokenUtils.ETH_ADDR.withdrawTokens(_to, type(uint256).max);

        _srcAddr.withdrawTokens(_to, type(uint256).max);
        _destAddr.withdrawTokens(_to, type(uint256).max);
    }

    function sliceUint(bytes memory bs, uint256 start) internal pure returns (uint256) {
        if (bs.length < start + 32){
            revert OutOfRangeSlicingError();
        }

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

        return x;
    }

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

        bytes32 input = bytes32(_input);

        _index += 32;

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






contract DFSExchangeData {

    struct OffchainData {
        address wrapper; // dfs wrapper address for the aggregator (must be in WrapperExchangeRegistry)
        address exchangeAddr; // exchange address we are calling to execute the order (must be in ExchangeAggregatorRegistry)
        address allowanceTarget; // exchange aggregator contract we give allowance to
        uint256 price; // expected price that the aggregator sent us
        uint256 protocolFee; // deprecated (used as a separate fee amount for 0x v1)
        bytes callData; // 0ff-chain calldata the aggregator gives to perform the swap
    }

    struct ExchangeData {
        address srcAddr; // source token address (which we're selling)
        address destAddr; // destination token address (which we're buying)
        uint256 srcAmount; // amount of source token in token decimals
        uint256 destAmount; // amount of bought token in token decimals
        uint256 minPrice; // minPrice we are expecting (checked in DFSExchangeCore)
        uint256 dfsFeeDivider; // service fee divider
        address user; // currently deprecated (used to check custom fees for the user)
        address wrapper; // on-chain wrapper address (must be in WrapperExchangeRegistry)
        bytes wrapperData; // on-chain additional data for on-chain (uniswap route for example)
        OffchainData offchainData; // offchain aggregator order
    }
}







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










contract ParaswapWrapper is IOffchainWrapper, DFSExchangeHelper, AdminAuth {

    using TokenUtils for address;
    using SafeERC20 for IERC20;

    /// @notice offchainData.callData should be this struct encoded
    struct ParaswapCalldata{
        bytes realCalldata;
        uint256 offset;
    }

    /// @notice Takes order from Paraswap and returns bool indicating if it is successful
    /// @param _exData Exchange data
    function takeOrder(
        ExchangeData memory _exData
    ) override public payable returns (bool success, uint256) {
        ParaswapCalldata memory paraswapCalldata = abi.decode(_exData.offchainData.callData, (ParaswapCalldata));

        // approve paraswap allowance contract
        IERC20(_exData.srcAddr).safeApprove(_exData.offchainData.allowanceTarget, _exData.srcAmount);

        // write in the exact amount we are selling/buying in an order
        writeUint256(paraswapCalldata.realCalldata, paraswapCalldata.offset, _exData.srcAmount);

        uint256 tokensBefore = _exData.destAddr.getBalance(address(this));

        /// @dev the amount of tokens received is checked in DFSExchangeCore
        /// @dev Exchange wrapper contracts should not be used on their own
        (success, ) = _exData.offchainData.exchangeAddr.call(paraswapCalldata.realCalldata);
        uint256 tokensSwapped = 0;

        if (success) {
            // get the current balance of the swapped tokens
            tokensSwapped = _exData.destAddr.getBalance(address(this)) - tokensBefore;
            if (tokensSwapped == 0){
                revert ZeroTokensSwapped();
            }
        }

        // returns all funds from src addr, dest addr and eth funds (protocol fee leftovers)
        sendLeftover(_exData.srcAddr, _exData.destAddr, payable(msg.sender));

        return (success, tokensSwapped);
    }

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

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[{"inputs":[],"name":"InvalidOffchainData","type":"error"},{"inputs":[],"name":"NonContractCall","type":"error"},{"inputs":[],"name":"OutOfRangeSlicingError","type":"error"},{"inputs":[],"name":"SenderNotAdmin","type":"error"},{"inputs":[],"name":"SenderNotOwner","type":"error"},{"inputs":[],"name":"ZeroTokensSwapped","type":"error"},{"inputs":[],"name":"adminVault","outputs":[{"internalType":"contract AdminVault","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"kill","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"components":[{"internalType":"address","name":"srcAddr","type":"address"},{"internalType":"address","name":"destAddr","type":"address"},{"internalType":"uint256","name":"srcAmount","type":"uint256"},{"internalType":"uint256","name":"destAmount","type":"uint256"},{"internalType":"uint256","name":"minPrice","type":"uint256"},{"internalType":"uint256","name":"dfsFeeDivider","type":"uint256"},{"internalType":"address","name":"user","type":"address"},{"internalType":"address","name":"wrapper","type":"address"},{"internalType":"bytes","name":"wrapperData","type":"bytes"},{"components":[{"internalType":"address","name":"wrapper","type":"address"},{"internalType":"address","name":"exchangeAddr","type":"address"},{"internalType":"address","name":"allowanceTarget","type":"address"},{"internalType":"uint256","name":"price","type":"uint256"},{"internalType":"uint256","name":"protocolFee","type":"uint256"},{"internalType":"bytes","name":"callData","type":"bytes"}],"internalType":"struct DFSExchangeData.OffchainData","name":"offchainData","type":"tuple"}],"internalType":"struct DFSExchangeData.ExchangeData","name":"_exData","type":"tuple"}],"name":"takeOrder","outputs":[{"internalType":"bool","name":"success","type":"bool"},{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"address","name":"_token","type":"address"},{"internalType":"address","name":"_receiver","type":"address"},{"internalType":"uint256","name":"_amount","type":"uint256"}],"name":"withdrawStuckFunds","outputs":[],"stateMutability":"nonpayable","type":"function"},{"stateMutability":"payable","type":"receive"}]

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