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// ╚════██║██╔══██╗██╔══██╗██╔══██╗██╔════╝██╔══██╗░░░██╔════╝██║
// ░░███╔═╝███████║██████╔╝██████╔╝█████╗░░██████╔╝░░░█████╗░░██║
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// ╚══════╝╚═╝░░╚═╝╚═╝░░░░░╚═╝░░░░░╚══════╝╚═╝░░╚═╝╚═╝╚═╝░░░░░╚═╝
// Copyright (C) 2021 zapper

// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 2 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Affero General Public License for more details.
//

///@author Zapper
///@notice This contract removes liquidity from yEarn Vaults to ETH or ERC20 Tokens.
// SPDX-License-Identifier: GPLv2

// File: oz/GSN/Context.sol

pragma solidity ^0.5.0;

/*
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with GSN meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
contract Context {
    // Empty internal constructor, to prevent people from mistakenly deploying
    // an instance of this contract, which should be used via inheritance.
    constructor() internal {}

    // solhint-disable-previous-line no-empty-blocks

    function _msgSender() internal view returns (address payable) {
        return msg.sender;
    }

    function _msgData() internal view returns (bytes memory) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}

// File: oz/ownership/Ownable.sol

pragma solidity ^0.5.0;

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
contract Ownable is Context {
    address private _owner;

    event OwnershipTransferred(
        address indexed previousOwner,
        address indexed newOwner
    );

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor() internal {
        address msgSender = _msgSender();
        _owner = msgSender;
        emit OwnershipTransferred(address(0), msgSender);
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(isOwner(), "Ownable: caller is not the owner");
        _;
    }

    /**
     * @dev Returns true if the caller is the current owner.
     */
    function isOwner() public view returns (bool) {
        return _msgSender() == _owner;
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public onlyOwner {
        emit OwnershipTransferred(_owner, address(0));
        _owner = address(0);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public onlyOwner {
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     */
    function _transferOwnership(address newOwner) internal {
        require(
            newOwner != address(0),
            "Ownable: new owner is the zero address"
        );
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}

// File: oz/token/ERC20/IERC20.sol

pragma solidity ^0.5.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP. Does not include
 * the optional functions; to access them see {ERC20Detailed}.
 */
interface IERC20 {
    function decimals() external view returns (uint8);

    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address recipient, uint256 amount)
        external
        returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender)
        external
        view
        returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `sender` to `recipient` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) external returns (bool);

    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(
        address indexed owner,
        address indexed spender,
        uint256 value
    );
}

// File: oz/math/SafeMath.sol

pragma solidity ^0.5.0;

/**
 * @dev Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * Arithmetic operations in Solidity wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");

        return c;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return sub(a, b, "SafeMath: subtraction overflow");
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     * - Subtraction cannot overflow.
     *
     * _Available since v2.4.0._
     */
    function sub(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        uint256 c = a - b;

        return c;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     * - Multiplication cannot overflow.
     */
    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;
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return div(a, b, "SafeMath: division by zero");
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     * - The divisor cannot be zero.
     *
     * _Available since v2.4.0._
     */
    function div(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        // Solidity only automatically asserts when dividing by 0
        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;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        return mod(a, b, "SafeMath: modulo by zero");
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts with custom message when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     * - The divisor cannot be zero.
     *
     * _Available since v2.4.0._
     */
    function mod(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        require(b != 0, errorMessage);
        return a % b;
    }
}

// File: oz/utils/Address.sol

pragma solidity ^0.5.5;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     */
    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);
    }

    /**
     * @dev Converts an `address` into `address payable`. Note that this is
     * simply a type cast: the actual underlying value is not changed.
     *
     * _Available since v2.4.0._
     */
    function toPayable(address account)
        internal
        pure
        returns (address payable)
    {
        return address(uint160(account));
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     *
     * _Available since v2.4.0._
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(
            address(this).balance >= amount,
            "Address: insufficient balance"
        );

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

// File: oz/token/ERC20/SafeERC20.sol

pragma solidity ^0.5.0;

/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeERC20 for ERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20 {
    using SafeMath for uint256;
    using Address for address;

    function safeTransfer(
        IERC20 token,
        address to,
        uint256 value
    ) internal {
        callOptionalReturn(
            token,
            abi.encodeWithSelector(token.transfer.selector, to, value)
        );
    }

    function safeTransferFrom(
        IERC20 token,
        address from,
        address to,
        uint256 value
    ) internal {
        callOptionalReturn(
            token,
            abi.encodeWithSelector(token.transferFrom.selector, from, to, value)
        );
    }

    function safeApprove(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        // safeApprove should only be called when setting an initial allowance,
        // or when resetting it to zero. To increase and decrease it, use
        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
        // solhint-disable-next-line max-line-length
        require(
            (value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        callOptionalReturn(
            token,
            abi.encodeWithSelector(token.approve.selector, spender, value)
        );
    }

    function safeIncreaseAllowance(
        IERC20 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(
        IERC20 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
            )
        );
    }

    /**
     * @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.

        // A Solidity high level call has three parts:
        //  1. The target address is checked to verify it contains contract code
        //  2. The call itself is made, and success asserted
        //  3. The return value is decoded, which in turn checks the size of the returned data.
        // solhint-disable-next-line max-line-length
        require(address(token).isContract(), "SafeERC20: call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = address(token).call(data);
        require(success, "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"
            );
        }
    }
}

// File: contracts/_base/ZapBaseV1.sol

pragma solidity ^0.5.7;

contract ZapBaseV1 is Ownable {
    using SafeMath for uint256;
    using SafeERC20 for IERC20;
    bool public stopped = false;

    // if true, goodwill is not deducted
    mapping(address => bool) public feeWhitelist;

    uint256 public goodwill;
    // % share of goodwill (0-100 %)
    uint256 affiliateSplit;
    // restrict affiliates
    mapping(address => bool) public affiliates;
    // affiliate => token => amount
    mapping(address => mapping(address => uint256)) public affiliateBalance;
    // token => amount
    mapping(address => uint256) public totalAffiliateBalance;

    address internal constant ETHAddress =
        0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE;

    constructor(uint256 _goodwill, uint256 _affiliateSplit) public {
        goodwill = _goodwill;
        affiliateSplit = _affiliateSplit;
    }

    // circuit breaker modifiers
    modifier stopInEmergency {
        if (stopped) {
            revert("Temporarily Paused");
        } else {
            _;
        }
    }

    function _getBalance(address token)
        internal
        view
        returns (uint256 balance)
    {
        if (token == address(0)) {
            balance = address(this).balance;
        } else {
            balance = IERC20(token).balanceOf(address(this));
        }
    }

    function _approveToken(address token, address spender) internal {
        IERC20 _token = IERC20(token);
        if (_token.allowance(address(this), spender) > 0) return;
        else {
            _token.safeApprove(spender, uint256(-1));
        }
    }

    function _approveToken(
        address token,
        address spender,
        uint256 amount
    ) internal {
        IERC20 _token = IERC20(token);
        _token.safeApprove(spender, 0);
        _token.safeApprove(spender, amount);
    }

    // - to Pause the contract
    function toggleContractActive() public onlyOwner {
        stopped = !stopped;
    }

    function set_feeWhitelist(address zapAddress, bool status)
        external
        onlyOwner
    {
        feeWhitelist[zapAddress] = status;
    }

    function set_new_goodwill(uint256 _new_goodwill) public onlyOwner {
        require(
            _new_goodwill >= 0 && _new_goodwill <= 100,
            "GoodWill Value not allowed"
        );
        goodwill = _new_goodwill;
    }

    function set_new_affiliateSplit(uint256 _new_affiliateSplit)
        external
        onlyOwner
    {
        require(
            _new_affiliateSplit <= 100,
            "Affiliate Split Value not allowed"
        );
        affiliateSplit = _new_affiliateSplit;
    }

    function set_affiliate(address _affiliate, bool _status)
        external
        onlyOwner
    {
        affiliates[_affiliate] = _status;
    }

    ///@notice Withdraw goodwill share, retaining affilliate share
    function withdrawTokens(address[] calldata tokens) external onlyOwner {
        for (uint256 i = 0; i < tokens.length; i++) {
            uint256 qty;

            if (tokens[i] == ETHAddress) {
                qty = address(this).balance.sub(
                    totalAffiliateBalance[tokens[i]]
                );
                Address.sendValue(Address.toPayable(owner()), qty);
            } else {
                qty = IERC20(tokens[i]).balanceOf(address(this)).sub(
                    totalAffiliateBalance[tokens[i]]
                );
                IERC20(tokens[i]).safeTransfer(owner(), qty);
            }
        }
    }

    ///@notice Withdraw affilliate share, retaining goodwill share
    function affilliateWithdraw(address[] calldata tokens) external {
        uint256 tokenBal;
        for (uint256 i = 0; i < tokens.length; i++) {
            tokenBal = affiliateBalance[msg.sender][tokens[i]];
            affiliateBalance[msg.sender][tokens[i]] = 0;
            totalAffiliateBalance[tokens[i]] = totalAffiliateBalance[tokens[i]]
                .sub(tokenBal);

            if (tokens[i] == ETHAddress) {
                Address.sendValue(msg.sender, tokenBal);
            } else {
                IERC20(tokens[i]).safeTransfer(msg.sender, tokenBal);
            }
        }
    }

    function() external payable {
        require(msg.sender != tx.origin, "Do not send ETH directly");
    }
}

// File: contracts/_base/ZapOutBaseV1.sol

pragma solidity ^0.5.7;

contract ZapOutBaseV1 is ZapBaseV1 {
    function _subtractGoodwill(
        address token,
        uint256 amount,
        address affiliate,
        bool enableGoodwill
    ) internal returns (uint256 totalGoodwillPortion) {
        bool whitelisted = feeWhitelist[msg.sender];
        if (enableGoodwill && !whitelisted && goodwill > 0) {
            totalGoodwillPortion = SafeMath.div(
                SafeMath.mul(amount, goodwill),
                10000
            );

            if (affiliates[affiliate]) {
                if (token == address(0)) {
                    token = ETHAddress;
                }

                uint256 affiliatePortion =
                    totalGoodwillPortion.mul(affiliateSplit).div(100);
                affiliateBalance[affiliate][token] = affiliateBalance[
                    affiliate
                ][token]
                    .add(affiliatePortion);
                totalAffiliateBalance[token] = totalAffiliateBalance[token].add(
                    affiliatePortion
                );
            }
        }
    }
}

// File: contracts/yEarn/yVault_ZapOut_V2.sol

pragma solidity ^0.5.7;

interface IYVault {
    function deposit(uint256) external;

    function withdraw(uint256) external;

    function getPricePerFullShare() external view returns (uint256);

    function token() external view returns (address);

    function decimals() external view returns (uint256);

    // V2
    function pricePerShare() external view returns (uint256);
}

interface IYVaultV1Registry {
    function getVaults() external view returns (address[] memory);

    function getVaultsLength() external view returns (uint256);
}

// -- Aave --
interface IAaveLendingPoolAddressesProvider {
    function getLendingPool() external view returns (address);

    function getLendingPoolCore() external view returns (address payable);
}

interface IAToken {
    function redeem(uint256 _amount) external;

    function underlyingAssetAddress() external returns (address);
}

contract yVault_ZapOut_V2 is ZapOutBaseV1 {
    // calldata only accepted for approved zap contracts
    mapping(address => bool) public approvedTargets;

    IAaveLendingPoolAddressesProvider
        private constant lendingPoolAddressProvider =
        IAaveLendingPoolAddressesProvider(
            0x24a42fD28C976A61Df5D00D0599C34c4f90748c8
        );

    IYVaultV1Registry V1Registry =
        IYVaultV1Registry(0x3eE41C098f9666ed2eA246f4D2558010e59d63A0);

    event Zapout(
        address _toWhomToIssue,
        address _fromYVaultAddress,
        address _toTokenAddress,
        uint256 _tokensRecieved
    );

    constructor(uint256 _goodwill, uint256 _affiliateSplit)
        public
        ZapBaseV1(_goodwill, _affiliateSplit)
    {}

    /**
    @notice Zap out in to a single token with permit
    @param fromVault Vault from which to remove liquidity
    @param amountIn Quantity of vault tokens to remove
    @param toToken Address of desired token
    @param isAaveUnderlying True if vault contains aave token
    @param minToTokens Minimum quantity of tokens to receive, reverts otherwise
    @param permitData Encoded permit data, which contains owner, spender, value, deadline, r,s,v values
    @param swapTarget Execution targets for swap or Zap
    @param swapData DEX or Zap data
    @param affiliate Affiliate address
    @return Quantity of tokens or ETH received
    */
    function ZapOutWithPermit(
        address fromVault,
        uint256 amountIn,
        address toToken,
        bool isAaveUnderlying,
        uint256 minToTokens,
        bytes calldata permitData,
        address swapTarget,
        bytes calldata swapData,
        address affiliate
    ) external returns (uint256 tokensReceived) {
        // permit
        (bool success, ) = fromVault.call(permitData);
        require(success, "Could Not Permit");

        return
            ZapOut(
                fromVault,
                amountIn,
                toToken,
                isAaveUnderlying,
                minToTokens,
                swapTarget,
                swapData,
                affiliate
            );
    }

    /**
    @notice Zap out in to a single token with permit
    @param fromVault Vault from which to remove liquidity
    @param amountIn Quantity of vault tokens to remove
    @param toToken Address of desired token
    @param isAaveUnderlying True if vault contains aave token
    @param minToTokens Minimum quantity of tokens to receive, reverts otherwise
    @param swapTarget Execution targets for swap or Zap
    @param swapData DEX or Zap data
    @param affiliate Affiliate address
    @return Quantity of tokens or ETH received
    */
    function ZapOut(
        address fromVault,
        uint256 amountIn,
        address toToken,
        bool isAaveUnderlying,
        uint256 minToTokens,
        address swapTarget,
        bytes memory swapData,
        address affiliate
    ) public stopInEmergency returns (uint256 tokensReceived) {
        require(
            approvedTargets[swapTarget] || swapTarget == address(0),
            "Target not Authorized"
        );

        IERC20(fromVault).safeTransferFrom(msg.sender, address(this), amountIn);

        // get underlying token from vault
        address underlyingToken = IYVault(fromVault).token();
        uint256 underlyingTokenReceived =
            _vaultWithdraw(fromVault, amountIn, underlyingToken);

        // swap to toToken
        uint256 toTokenAmt;

        if (isAaveUnderlying) {
            address underlyingAsset =
                IAToken(underlyingToken).underlyingAssetAddress();
            // unwrap atoken
            IAToken(underlyingToken).redeem(underlyingTokenReceived);

            // aTokens are 1:1
            if (underlyingAsset == toToken) {
                toTokenAmt = underlyingTokenReceived;
            } else {
                toTokenAmt = _fillQuote(
                    underlyingAsset,
                    toToken,
                    underlyingTokenReceived,
                    swapTarget,
                    swapData
                );
            }
        } else {
            toTokenAmt = _fillQuote(
                underlyingToken,
                toToken,
                underlyingTokenReceived,
                swapTarget,
                swapData
            );
        }
        require(toTokenAmt >= minToTokens, "Err: High Slippage");

        uint256 totalGoodwillPortion =
            _subtractGoodwill(toToken, toTokenAmt, affiliate, true);
        tokensReceived = toTokenAmt.sub(totalGoodwillPortion);

        // send toTokens
        if (toToken == address(0)) {
            Address.sendValue(msg.sender, tokensReceived);
        } else {
            IERC20(toToken).safeTransfer(msg.sender, tokensReceived);
        }
    }

    function _vaultWithdraw(
        address fromVault,
        uint256 amount,
        address underlyingVaultToken
    ) internal returns (uint256 underlyingReceived) {
        uint256 iniUnderlyingBal = _getBalance(underlyingVaultToken);

        IYVault(fromVault).withdraw(amount);

        underlyingReceived = _getBalance(underlyingVaultToken).sub(
            iniUnderlyingBal
        );
    }

    function _fillQuote(
        address _fromTokenAddress,
        address toToken,
        uint256 _amount,
        address _swapTarget,
        bytes memory swapCallData
    ) internal returns (uint256 amtBought) {
        uint256 valueToSend;

        if (_fromTokenAddress == toToken) {
            return _amount;
        }

        if (_fromTokenAddress == address(0)) {
            valueToSend = _amount;
        } else {
            _approveToken(_fromTokenAddress, _swapTarget, _amount);
        }

        uint256 iniBal = _getBalance(toToken);

        (bool success, ) = _swapTarget.call.value(valueToSend)(swapCallData);
        require(success, "Error Swapping Tokens 1");

        uint256 finalBal = _getBalance(toToken);

        require(finalBal > 0, "ERR: Swapped to wrong token");

        amtBought = finalBal.sub(iniBal);
    }

    /**
    @notice Utility function to determine the quantity of underlying tokens removed from vault
    @param fromVault Yearn vault from which to remove liquidity
    @param liquidity Quantity of vault tokens to remove
    @return Quantity of underlying LP or token removed
    */
    function removeLiquidityReturn(address fromVault, uint256 liquidity)
        external
        view
        returns (uint256)
    {
        IYVault vault = IYVault(fromVault);

        address[] memory V1Vaults = V1Registry.getVaults();

        for (uint256 i = 0; i < V1Registry.getVaultsLength(); i++) {
            if (V1Vaults[i] == fromVault)
                return
                    (liquidity.mul(vault.getPricePerFullShare())).div(10**18);
        }
        return (liquidity.mul(vault.pricePerShare())).div(10**vault.decimals());
    }

    function setApprovedTargets(
        address[] calldata targets,
        bool[] calldata isApproved
    ) external onlyOwner {
        require(targets.length == isApproved.length, "Invalid Input length");

        for (uint256 i = 0; i < targets.length; i++) {
            approvedTargets[targets[i]] = isApproved[i];
        }
    }
}

{
  "compilationTarget": {
    "yVault_ZapOut_V2.sol": "yVault_ZapOut_V2"
  },
  "evmVersion": "istanbul",
  "libraries": {},
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "remappings": []
}