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// SPDX-License-Identifier: MIT
pragma solidity 0.6.12;

import "./Interfaces.sol";
import "@openzeppelin/contracts-0.6/math/SafeMath.sol";
import "@openzeppelin/contracts-0.6/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts-0.6/utils/Address.sol";
import "@openzeppelin/contracts-0.6/token/ERC20/SafeERC20.sol";

/**
 * @title   VoterProxy
 * @author  ConvexFinance
 * @notice  VoterProxy whitelisted in the curve SmartWalletWhitelist that
 *          participates in Curve governance. Also handles all deposits since this is 
 *          the address that has the voting power.
 */
contract VoterProxy {
    using SafeERC20 for IERC20;
    using Address for address;
    using SafeMath for uint256;

    address public mintr;
    address public immutable crv;
    address public immutable crvBpt;

    address public immutable escrow;
    address public gaugeController;
    address public rewardDeposit;
    address public withdrawer;

    address public owner;
    address public operator;
    address public depositor;
    
    mapping (address => bool) private stashPool;
    mapping (address => bool) private protectedTokens;
    mapping (bytes32 => bool) private votes;

    bytes4 constant internal EIP1271_MAGIC_VALUE = 0x1626ba7e;

    event VoteSet(bytes32 hash, bool valid);

    /**
     * @param _mintr            CRV minter
     * @param _crv              CRV Token address
     * @param _crvBpt           CRV:ETH 80-20 BPT Token address
     * @param _escrow           Curve Voting escrow contract
     * @param _gaugeController  Curve Gauge Controller
     *                          Controls liquidity gauges and the issuance of coins through the gauges
     */
    constructor(
        address _mintr,
        address _crv,
        address _crvBpt,
        address _escrow,
        address _gaugeController
    ) public {
        mintr = _mintr; 
        crv = _crv;
        crvBpt = _crvBpt;
        escrow = _escrow;
        gaugeController = _gaugeController;
        owner = msg.sender;

        protectedTokens[_crv] = true;
        protectedTokens[_crvBpt] = true;
    }

    function getName() external pure returns (string memory) {
        return "BunniVoterProxy";
    }

    function setOwner(address _owner) external {
        require(msg.sender == owner, "!auth");
        owner = _owner;
    }

    /**
     * @notice Allows dao to set the reward withdrawal address
     * @param _withdrawer Whitelisted withdrawer
     * @param _rewardDeposit Distributor address
     */
    function setRewardDeposit(address _withdrawer, address _rewardDeposit) external {
        require(msg.sender == owner, "!auth");
        withdrawer = _withdrawer;
        rewardDeposit = _rewardDeposit;
    }

    /**
     * @notice Allows dao to set the external system config, should it change in the future
     * @param _gaugeController External gauge controller address
     * @param _mintr Token minter address for claiming rewards
     */
    function setSystemConfig(address _gaugeController, address _mintr) external returns (bool) {
        require(msg.sender == owner, "!auth");
        gaugeController = _gaugeController;
        mintr = _mintr;
        return true;
    }

    /**
     * @notice Set the operator of the VoterProxy
     * @param _operator Address of the operator (Booster)
     */
    function setOperator(address _operator) external {
        require(msg.sender == owner, "!auth");
        require(operator == address(0) || IDeposit(operator).isShutdown() == true, "needs shutdown");
        
        operator = _operator;
    }

    /**
     * @notice Set the depositor of the VoterProxy
     * @param _depositor Address of the depositor (CrvDepositor)
     */
    function setDepositor(address _depositor) external {
        require(msg.sender == owner, "!auth");

        depositor = _depositor;
    }

    function setStashAccess(address _stash, bool _status) external returns(bool){
        require(msg.sender == operator, "!auth");
        if(_stash != address(0)){
            stashPool[_stash] = _status;
        }
        return true;
    }

    /**
     * @notice Save a vote hash so when snapshot.org asks this contract if 
     *          a vote signature is valid we are able to check for a valid hash
     *          and return the appropriate response inline with EIP 1721
     * @param _hash  Hash of vote signature that was sent to snapshot.org
     * @param _valid Is the hash valid
     */
    function setVote(bytes32 _hash, bool _valid) external {
        require(msg.sender == operator, "!auth");
        votes[_hash] = _valid;
        emit VoteSet(_hash, _valid);
    }

    /**
     * @notice  Verifies that the hash is valid
     * @dev     Snapshot Hub will call this function when a vote is submitted using
     *          snapshot.js on behalf of this contract. Snapshot Hub will call this
     *          function with the hash and the signature of the vote that was cast.
     * @param _hash Hash of the message that was sent to Snapshot Hub to cast a vote
     * @return EIP1271 magic value if the signature is value 
     */
    function isValidSignature(bytes32 _hash, bytes memory) public view returns (bytes4) {
        if(votes[_hash]) {
            return EIP1271_MAGIC_VALUE;
        } else {
            return 0xffffffff;
        }  
    }

    /**
     * @notice  Deposit tokens into the Curve Gauge
     * @dev     Only can be called by the operator (Booster) once this contract has been
     *          whitelisted by the Curve DAO
     * @param _token  Deposit LP token address
     * @param _gauge  Gauge contract to deposit to 
     */ 
    function deposit(address _token, address _gauge) external returns(bool){
        require(msg.sender == operator, "!auth");
        if(protectedTokens[_token] == false){
            protectedTokens[_token] = true;
        }
        if(protectedTokens[_gauge] == false){
            protectedTokens[_gauge] = true;
        }
        uint256 balance = IERC20(_token).balanceOf(address(this));
        if (balance > 0) {
            IERC20(_token).safeApprove(_gauge, 0);
            IERC20(_token).safeApprove(_gauge, balance);
            ICurveGauge(_gauge).deposit(balance);
        }
        return true;
    }

    /**
     * @notice  Withdraw ERC20 tokens that have been distributed as extra rewards
     * @dev     Tokens shouldn't end up here if they can help it. However, dao can
     *          set a withdrawer that can process these to some ExtraRewardDistribution.
     */
    function withdraw(IERC20 _asset) external returns (uint256 balance) {
        require(msg.sender == withdrawer, "!auth");
        require(protectedTokens[address(_asset)] == false, "protected");

        balance = _asset.balanceOf(address(this));
        _asset.safeApprove(rewardDeposit, 0);
        _asset.safeApprove(rewardDeposit, balance);
        IRewardDeposit(rewardDeposit).addReward(address(_asset), balance);
        return balance;
    }

    /**
     * @notice  Withdraw LP tokens from a gauge 
     * @dev     Only callable by the operator 
     * @param _token    LP token address
     * @param _gauge    Gauge for this LP token
     * @param _amount   Amount of LP token to withdraw
     */
    function withdraw(address _token, address _gauge, uint256 _amount) public returns(bool){
        require(msg.sender == operator, "!auth");
        uint256 _balance = IERC20(_token).balanceOf(address(this));
        if (_balance < _amount) {
            _amount = _withdrawSome(_gauge, _amount.sub(_balance));
            _amount = _amount.add(_balance);
        }
        IERC20(_token).safeTransfer(msg.sender, _amount);
        return true;
    }

    /**
     * @notice  Withdraw all LP tokens from a gauge 
     * @dev     Only callable by the operator 
     * @param _token  LP token address
     * @param _gauge  Gauge for this LP token
     */
    function withdrawAll(address _token, address _gauge) external returns(bool){
        require(msg.sender == operator, "!auth");
        uint256 amount = balanceOfPool(_gauge).add(IERC20(_token).balanceOf(address(this)));
        withdraw(_token, _gauge, amount);
        return true;
    }

    function _withdrawSome(address _gauge, uint256 _amount) internal returns (uint256) {
        ICurveGauge(_gauge).withdraw(_amount);
        return _amount;
    }
    
    
    /**
     * @notice  Lock CRV in Curve's voting escrow contract
     * @dev     Called by the CrvDepositor contract
     * @param _value      Amount of crv to lock
     * @param _unlockTime Timestamp to unlock (max is 4 years)
     */
    function createLock(uint256 _value, uint256 _unlockTime) external returns(bool){
        require(msg.sender == depositor, "!auth");
        IERC20(crvBpt).safeApprove(escrow, 0);
        IERC20(crvBpt).safeApprove(escrow, _value);
        ICurveVoteEscrow(escrow).create_lock(_value, _unlockTime);
        return true;
    }
  
    /**
     * @notice Called by the CrvDepositor to increase amount of locked curve
     */
    function increaseAmount(uint256 _value) external returns(bool){
        require(msg.sender == depositor, "!auth");
        IERC20(crvBpt).safeApprove(escrow, 0);
        IERC20(crvBpt).safeApprove(escrow, _value);
        ICurveVoteEscrow(escrow).increase_amount(_value);
        return true;
    }

    /**
     * @notice Called by the CrvDepositor to increase unlocked time of curve
     * @param _value Timestamp to increase locking to
     */
    function increaseTime(uint256 _value) external returns(bool){
        require(msg.sender == depositor, "!auth");
        ICurveVoteEscrow(escrow).increase_unlock_time(_value);
        return true;
    }

    /**
     * @notice  Withdraw all CRV from Curve's voting escrow contract
     * @dev     Only callable by CrvDepositor and can only withdraw if lock has expired
     */
    function release() external returns(bool){
        require(msg.sender == depositor, "!auth");
        ICurveVoteEscrow(escrow).withdraw();
        return true;
    }

    /**
     * @notice Vote on CRV DAO for proposal
     */
    function vote(uint256 _voteId, address _votingAddress, bool _support) external returns(bool){
        require(msg.sender == operator, "!auth");
        IVoting(_votingAddress).vote(_voteId,_support,false);
        return true;
    }

    /**
     * @notice Vote for a single gauge weight via the controller
     */
    function voteGaugeWeight(address _gauge, uint256 _weight) external returns(bool){
        require(msg.sender == operator, "!auth");

        //vote
        IVoting(gaugeController).vote_for_gauge_weights(_gauge, _weight);
        return true;
    }

    /**
     * @notice  Claim CRV from Curve
     * @dev     Claim CRV for LP token staking from the CRV minter contract
     */
    function claimCrv(address _gauge) external returns (uint256){
        require(msg.sender == operator, "!auth");
        
        uint256 _balance = 0;
        try IMinter(mintr).mint(_gauge){
            _balance = IERC20(crv).balanceOf(address(this));
            IERC20(crv).safeTransfer(operator, _balance);
        }catch{}

        return _balance;
    }

    /**
     * @notice  Claim extra rewards from gauge
     * @dev     Called by operator (Booster) to claim extra rewards 
     */
    function claimRewards(address _gauge) external returns(bool){
        require(msg.sender == operator, "!auth");
        ICurveGauge(_gauge).claim_rewards();
        return true;
    }

    /**
     * @notice  Claim fees (3crv) from staking lp tokens
     * @dev     Only callable by the operator Booster
     * @param _distroContract   Fee distribution contract
     * @param _token            LP token to claim fees for
     */
    function claimFees(address _distroContract, address _token) external returns (uint256){
        require(msg.sender == operator, "!auth");
        IFeeDistributor(_distroContract).claimToken(address(this), _token);
        uint256 _balance = IERC20(_token).balanceOf(address(this));
        IERC20(_token).safeTransfer(operator, _balance);
        return _balance;
    }    

    function balanceOfPool(address _gauge) public view returns (uint256) {
        return ICurveGauge(_gauge).balanceOf(address(this));
    }

    function execute(
        address _to,
        uint256 _value,
        bytes calldata _data
    ) external returns (bool, bytes memory) {
        require(msg.sender == operator,"!auth");

        (bool success, bytes memory result) = _to.call{value:_value}(_data);
        require(success, "!success");

        return (success, result);
    }

}

// SPDX-License-Identifier: MIT
pragma solidity 0.6.12;



interface ICurveGauge {
    function deposit(uint256) external;
    function balanceOf(address) external view returns (uint256);
    function withdraw(uint256) external;
    function claim_rewards() external;
    function reward_tokens(uint256) external view returns(address);//v2
    function rewarded_token() external view returns(address);//v1
    function lp_token() external view returns(address);
}

interface ICurveVoteEscrow {
    function create_lock(uint256, uint256) external;
    function increase_amount(uint256) external;
    function increase_unlock_time(uint256) external;
    function withdraw() external;
    function smart_wallet_checker() external view returns (address);
    function commit_smart_wallet_checker(address) external;
    function apply_smart_wallet_checker() external;
}

interface IWalletChecker {
    function check(address) external view returns (bool);
    function approveWallet(address) external;
    function dao() external view returns (address);
}

interface IVoting{
    function vote(uint256, bool, bool) external; //voteId, support, executeIfDecided
    function getVote(uint256) external view returns(bool,bool,uint64,uint64,uint64,uint64,uint256,uint256,uint256,bytes memory); 
    function vote_for_gauge_weights(address,uint256) external;
}

interface IMinter{
    function mint(address) external;
}

interface IStaker{
    function deposit(address, address) external returns (bool);
    function withdraw(address) external returns (uint256);
    function withdraw(address, address, uint256) external returns (bool);
    function withdrawAll(address, address) external returns (bool);
    function createLock(uint256, uint256) external returns(bool);
    function increaseAmount(uint256) external returns(bool);
    function increaseTime(uint256) external returns(bool);
    function release() external returns(bool);
    function claimCrv(address) external returns (uint256);
    function claimRewards(address) external returns(bool);
    function claimFees(address,address) external returns (uint256);
    function setStashAccess(address, bool) external returns (bool);
    function vote(uint256,address,bool) external returns(bool);
    function voteGaugeWeight(address,uint256) external returns(bool);
    function balanceOfPool(address) external view returns (uint256);
    function operator() external view returns (address);
    function execute(address _to, uint256 _value, bytes calldata _data) external returns (bool, bytes memory);
    function setVote(bytes32 hash, bool valid) external;
    function migrate(address to) external;
}

interface IRewards{
    function stake(address, uint256) external;
    function stakeFor(address, uint256) external;
    function withdraw(address, uint256) external;
    function exit(address) external;
    function getReward(address) external;
    function queueNewRewards(uint256) external;
    function notifyRewardAmount(uint256) external;
    function addExtraReward(address) external;
    function extraRewardsLength() external view returns (uint256);
    function stakingToken() external view returns (address);
    function rewardToken() external view returns(address);
    function earned(address account) external view returns (uint256);
}

interface IStash{
    function stashRewards() external returns (bool);
    function processStash() external returns (bool);
    function claimRewards() external returns (bool);
    function initialize(uint256 _pid, address _operator, address _staker, address _gauge, address _rewardFactory) external;
    function setExtraReward(address) external;
}

interface IFeeDistributor {
    function claimToken(address user, address token) external returns (uint256);
    function claimTokens(address user, address[] calldata tokens) external returns (uint256[] memory);
    function getTokenTimeCursor(address token) external view returns (uint256);
}

interface ITokenMinter{
    function mint(address,uint256) external;
    function burn(address,uint256) external;
}

interface IDeposit{
    function isShutdown() external view returns(bool);
    function balanceOf(address _account) external view returns(uint256);
    function totalSupply() external view returns(uint256);
    function poolInfo(uint256) external view returns(address,address,address,address,address, bool);
    function rewardClaimed(uint256,address,uint256) external;
    function withdrawTo(uint256,uint256,address) external;
    function claimRewards(uint256,address) external returns(bool);
    function rewardArbitrator() external returns(address);
    function setGaugeRedirect(uint256 _pid) external returns(bool);
    function owner() external returns(address);
    function deposit(uint256 _pid, uint256 _amount, bool _stake) external returns(bool);
}

interface ICrvDeposit{
    function deposit(uint256, bool) external;
    function lockIncentive() external view returns(uint256);
}

interface IRewardFactory{
    function setAccess(address,bool) external;
    function CreateCrvRewards(uint256,address,address) external returns(address);
    function CreateTokenRewards(address,address,address) external returns(address);
    function activeRewardCount(address) external view returns(uint256);
    function addActiveReward(address,uint256) external returns(bool);
    function removeActiveReward(address,uint256) external returns(bool);
}

interface IStashFactory{
    function CreateStash(uint256,address,address,uint256) external returns(address);
    function setImplementation(address, address, address) external;
}

interface ITokenFactory{
    function CreateDepositToken(address) external returns(address);
}

interface IPools{
    function addPool(address _lptoken, address _gauge, uint256 _stashVersion) external returns(bool);
    function forceAddPool(address _lptoken, address _gauge, uint256 _stashVersion) external returns(bool);
    function shutdownPool(uint256 _pid) external returns(bool);
    function poolInfo(uint256) external view returns(address,address,address,address,address,bool);
    function poolLength() external view returns (uint256);
    function gaugeMap(address) external view returns(bool);
    function setPoolManager(address _poolM) external;
    function shutdownSystem() external;
    function setUsedAddress(address[] memory) external;
}

interface IVestedEscrow{
    function fund(address[] calldata _recipient, uint256[] calldata _amount) external returns(bool);
}

interface IRewardDeposit {
    function addReward(address, uint256) external;
}

interface ILocker {
    function lock(address _account, uint256 _amount) external;
    function checkpointEpoch() external;
    function epochCount() external view returns (uint256);
    function balanceAtEpochOf(uint256 _epoch, address _user) external view returns (uint256 amount);
    function totalSupplyAtEpoch(uint256 _epoch) external view returns (uint256 supply);
    function queueNewRewards(address _rewardsToken, uint256 reward) external;
    function getReward(address _account, bool _stake) external;
    function getReward(address _account) external;
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

/**
 * @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, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        uint256 c = a + b;
        if (c < a) return (false, 0);
        return (true, c);
    }

    /**
     * @dev Returns the substraction of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b > a) return (false, 0);
        return (true, a - b);
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryMul(uint256 a, uint256 b) internal pure returns (bool, 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 (true, 0);
        uint256 c = a * b;
        if (c / a != b) return (false, 0);
        return (true, c);
    }

    /**
     * @dev Returns the division of two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b == 0) return (false, 0);
        return (true, a / b);
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b == 0) return (false, 0);
        return (true, a % b);
    }

    /**
     * @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) {
        require(b <= a, "SafeMath: subtraction overflow");
        return a - b;
    }

    /**
     * @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) {
        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, reverting 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) {
        require(b > 0, "SafeMath: division by zero");
        return a / b;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting 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) {
        require(b > 0, "SafeMath: modulo by zero");
        return a % b;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {trySub}.
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        return a - b;
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryDiv}.
     *
     * 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, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        return a / b;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting with custom message when dividing by zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryMod}.
     *
     * 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, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        return a % b;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @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);
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.2 <0.8.0;

/**
 * @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) {
        // This method relies on extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.

        uint256 size;
        // solhint-disable-next-line no-inline-assembly
        assembly { size := extcodesize(account) }
        return size > 0;
    }

    /**
     * @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].
     */
    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");
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain`call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
      return functionCall(target, data, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    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");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    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");
        require(isContract(target), "Address: call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.call{ value: value }(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data, string memory errorMessage) internal view returns (bytes memory) {
        require(isContract(target), "Address: static call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.staticcall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
        require(isContract(target), "Address: delegate call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    function _verifyCallResult(bool success, bytes memory returndata, string memory errorMessage) private pure returns(bytes memory) {
        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);
            }
        }
    }
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

import "./IERC20.sol";
import "../../math/SafeMath.sol";
import "../../utils/Address.sol";

/**
 * @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 IERC20;` 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));
    }

    /**
     * @dev Deprecated. This function has issues similar to the ones found in
     * {IERC20-approve}, and its usage is discouraged.
     *
     * Whenever possible, use {safeIncreaseAllowance} and
     * {safeDecreaseAllowance} instead.
     */
    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. 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");
        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");
        }
    }
}

{
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "metadata": {
    "useLiteralContent": true
  },
  "libraries": {}
}

• No Contract Security Audit Submitted- Submit Audit Here

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000000000000000000000000f087521ffca0fa8a43f5c445773ab37c5f574da0000000000000000000000000627fee87d0d9d2c55098a06ac805db8f98b158aa0000000000000000000000009232a548dd9e81bac65500b5e0d918f8ba93675c000000000000000000000000f17d23136b4fead139f54fb766c8795faae09660000000000000000000000000901c8aa6a61f74ac95e7f397e22a0ac7c1242218

-----Decoded View---------------
Arg [0] : _mintr (address): 0xF087521Ffca0Fa8A43F5C445773aB37C5f574DA0
Arg [1] : _crv (address): 0x627fee87d0D9D2c55098A06ac805Db8F98B158Aa
Arg [2] : _crvBpt (address): 0x9232a548DD9E81BaC65500b5e0d918F8Ba93675C
Arg [3] : _escrow (address): 0xf17d23136B4FeAd139f54fB766c8795faae09660
Arg [4] : _gaugeController (address): 0x901c8aA6A61f74aC95E7f397E22A0Ac7c1242218

-----Encoded View---------------
5 Constructor Arguments found :
Arg [0] : 000000000000000000000000f087521ffca0fa8a43f5c445773ab37c5f574da0
Arg [1] : 000000000000000000000000627fee87d0d9d2c55098a06ac805db8f98b158aa
Arg [2] : 0000000000000000000000009232a548dd9e81bac65500b5e0d918f8ba93675c
Arg [3] : 000000000000000000000000f17d23136b4fead139f54fb766c8795faae09660
Arg [4] : 000000000000000000000000901c8aa6a61f74ac95e7f397e22a0ac7c1242218