Token

/**
 *Submitted for verification at Etherscan.io on 2024-03-17
*/

// SPDX-License-Identifier: MIT
pragma solidity <0.8.0 =0.6.12 >=0.6.0 >=0.6.2;
pragma experimental ABIEncoderV2;

// contracts/contracts/interfaces/IBooster.sol

interface IBooster {
    function owner() external view returns(address);
    function feeToken() external view returns(address);
    function feeDistro() external view returns(address);
    function lockFees() external view returns(address);
    function stakerRewards() external view returns(address);
    function lockRewards() external view returns(address);
    function setVoteDelegate(address _voteDelegate) external;
    function vote(uint256 _voteId, address _votingAddress, bool _support) external returns(bool);
    function voteGaugeWeight(address[] calldata _gauge, uint256[] calldata _weight ) external returns(bool);
    function poolInfo(uint256 _pid) external view returns(address _lptoken, address _token, address _gauge, address _crvRewards, address _stash, bool _shutdown);
    function earmarkRewards(uint256 _pid) external returns(bool);
    function earmarkFees() external returns(bool);
    function isShutdown() external view returns(bool);
    function poolLength() external view returns (uint256);
}

// contracts/contracts/interfaces/IConvexDeposits.sol

interface IConvexDeposits {
    function deposit(uint256 _pid, uint256 _amount, bool _stake) external returns(bool);
    function deposit(uint256 _amount, bool _lock, address _stakeAddress) external;
}

// contracts/contracts/interfaces/ICvx.sol

interface ICvx {
    function reductionPerCliff() external view returns(uint256);
    function totalSupply() external view returns(uint256);
    function totalCliffs() external view returns(uint256);
    function maxSupply() external view returns(uint256);
}

// contracts/contracts/interfaces/IMorpho.sol

interface IMorpho {
    struct MarketParams {
        address loanToken;
        address collateralToken;
        address oracle;
        address irm;
        uint256 lltv;
    }

    struct Position {
        uint256 supplyShares;
        uint128 borrowShares;
        uint128 collateral;
    }

    function supplyCollateral(MarketParams memory marketParams, uint256 assets, address onBehalf, bytes memory data) external;
    function position(bytes32 id, address account) external view returns(Position memory p);
    function idToMarketParams(bytes32 id) external view returns(MarketParams memory mp);
    function owner() external view returns(address);
}

// contracts/contracts/interfaces/IOwner.sol

interface IOwner {
    function setPendingOwner(address _powner) external;
    function acceptPendingOwner() external;
    function owner() external view returns(address);
    function pendingOwner() external view returns(address);
}

// contracts/contracts/interfaces/IRewardHook.sol

interface IRewardHook {
    function onRewardClaim() external;
}

// contracts/contracts/interfaces/IRewardStaking.sol

interface IRewardStaking {
    function stakeFor(address, uint256) external;
    function stake( uint256) external;
    function withdraw(uint256 amount, bool claim) external;
    function withdrawAndUnwrap(uint256 amount, bool claim) external;
    function earned(address account) external view returns (uint256);
    function getReward() external;
    function getReward(address _account, bool _claimExtras) external;
    function extraRewardsLength() external view returns (uint256);
    function extraRewards(uint256 _pid) external view returns (address);
    function rewardToken() external view returns (address);
    function balanceOf(address _account) external view returns (uint256);
    function rewardRate() external view returns(uint256);
    function totalSupply() external view returns(uint256);
    function periodFinish() external view returns(uint256);
}

// contracts/contracts/interfaces/ITokenWrapper.sol

interface ITokenWrapper {
   function token() external view returns (address);
}

// lib/openzeppelin-contracts/contracts/math/SafeMath.sol

/**
 * @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;
    }
}

// lib/openzeppelin-contracts/contracts/token/ERC20/IERC20.sol

/**
 * @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);
}

// lib/openzeppelin-contracts/contracts/utils/Address.sol

/**
 * @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);
            }
        }
    }
}

// lib/openzeppelin-contracts/contracts/utils/Context.sol

/*
 * @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.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address payable) {
        return msg.sender;
    }

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

// lib/openzeppelin-contracts/contracts/utils/ReentrancyGuard.sol

/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
 * available, which can be applied to functions to make sure there are no nested
 * (reentrant) calls to them.
 *
 * Note that because there is a single `nonReentrant` guard, functions marked as
 * `nonReentrant` may not call one another. This can be worked around by making
 * those functions `private`, and then adding `external` `nonReentrant` entry
 * points to them.
 *
 * TIP: If you would like to learn more about reentrancy and alternative ways
 * to protect against it, check out our blog post
 * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
 */
abstract contract ReentrancyGuard {
    // Booleans are more expensive than uint256 or any type that takes up a full
    // word because each write operation emits an extra SLOAD to first read the
    // slot's contents, replace the bits taken up by the boolean, and then write
    // back. This is the compiler's defense against contract upgrades and
    // pointer aliasing, and it cannot be disabled.

    // The values being non-zero value makes deployment a bit more expensive,
    // but in exchange the refund on every call to nonReentrant will be lower in
    // amount. Since refunds are capped to a percentage of the total
    // transaction's gas, it is best to keep them low in cases like this one, to
    // increase the likelihood of the full refund coming into effect.
    uint256 private constant _NOT_ENTERED = 1;
    uint256 private constant _ENTERED = 2;

    uint256 private _status;

    constructor () internal {
        _status = _NOT_ENTERED;
    }

    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and make it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        // On the first call to nonReentrant, _notEntered will be true
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

        // Any calls to nonReentrant after this point will fail
        _status = _ENTERED;

        _;

        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = _NOT_ENTERED;
    }
}

// contracts/contracts/interfaces/CvxMining.sol

library CvxMining{
    ICvx public constant cvx = ICvx(0x4e3FBD56CD56c3e72c1403e103b45Db9da5B9D2B);

    function ConvertCrvToCvx(uint256 _amount) external view returns(uint256){
        uint256 supply = cvx.totalSupply();
        uint256 reductionPerCliff = cvx.reductionPerCliff();
        uint256 totalCliffs = cvx.totalCliffs();
        uint256 maxSupply = cvx.maxSupply();

        uint256 cliff = supply / reductionPerCliff;
        //mint if below total cliffs
        if(cliff < totalCliffs){
            //for reduction% take inverse of current cliff
            uint256 reduction = totalCliffs - cliff;
            //reduce
            _amount = _amount * reduction / totalCliffs;

            //supply cap check
            uint256 amtTillMax = maxSupply - supply;
            if(_amount > amtTillMax){
                _amount = amtTillMax;
            }

            //mint
            return _amount;
        }
        return 0;
    }
}

// lib/openzeppelin-contracts/contracts/token/ERC20/ERC20.sol

/**
 * @dev Implementation of the {IERC20} interface.
 *
 * This implementation is agnostic to the way tokens are created. This means
 * that a supply mechanism has to be added in a derived contract using {_mint}.
 * For a generic mechanism see {ERC20PresetMinterPauser}.
 *
 * TIP: For a detailed writeup see our guide
 * https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How
 * to implement supply mechanisms].
 *
 * We have followed general OpenZeppelin guidelines: functions revert instead
 * of returning `false` on failure. This behavior is nonetheless conventional
 * and does not conflict with the expectations of ERC20 applications.
 *
 * Additionally, an {Approval} event is emitted on calls to {transferFrom}.
 * This allows applications to reconstruct the allowance for all accounts just
 * by listening to said events. Other implementations of the EIP may not emit
 * these events, as it isn't required by the specification.
 *
 * Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
 * functions have been added to mitigate the well-known issues around setting
 * allowances. See {IERC20-approve}.
 */
contract ERC20 is Context, IERC20 {
    using SafeMath for uint256;

    mapping (address => uint256) private _balances;

    mapping (address => mapping (address => uint256)) private _allowances;

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;
    uint8 private _decimals;

    /**
     * @dev Sets the values for {name} and {symbol}, initializes {decimals} with
     * a default value of 18.
     *
     * To select a different value for {decimals}, use {_setupDecimals}.
     *
     * All three of these values are immutable: they can only be set once during
     * construction.
     */
    constructor (string memory name_, string memory symbol_) public {
        _name = name_;
        _symbol = symbol_;
        _decimals = 18;
    }

    /**
     * @dev Returns the name of the token.
     */
    function name() public view virtual returns (string memory) {
        return _name;
    }

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view virtual returns (string memory) {
        return _symbol;
    }

    /**
     * @dev Returns the number of decimals used to get its user representation.
     * For example, if `decimals` equals `2`, a balance of `505` tokens should
     * be displayed to a user as `5,05` (`505 / 10 ** 2`).
     *
     * Tokens usually opt for a value of 18, imitating the relationship between
     * Ether and Wei. This is the value {ERC20} uses, unless {_setupDecimals} is
     * called.
     *
     * NOTE: This information is only used for _display_ purposes: it in
     * no way affects any of the arithmetic of the contract, including
     * {IERC20-balanceOf} and {IERC20-transfer}.
     */
    function decimals() public view virtual returns (uint8) {
        return _decimals;
    }

    /**
     * @dev See {IERC20-totalSupply}.
     */
    function totalSupply() public view virtual override returns (uint256) {
        return _totalSupply;
    }

    /**
     * @dev See {IERC20-balanceOf}.
     */
    function balanceOf(address account) public view virtual override returns (uint256) {
        return _balances[account];
    }

    /**
     * @dev See {IERC20-transfer}.
     *
     * Requirements:
     *
     * - `recipient` cannot be the zero address.
     * - the caller must have a balance of at least `amount`.
     */
    function transfer(address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(_msgSender(), recipient, amount);
        return true;
    }

    /**
     * @dev See {IERC20-allowance}.
     */
    function allowance(address owner, address spender) public view virtual override returns (uint256) {
        return _allowances[owner][spender];
    }

    /**
     * @dev See {IERC20-approve}.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        _approve(_msgSender(), spender, amount);
        return true;
    }

    /**
     * @dev See {IERC20-transferFrom}.
     *
     * Emits an {Approval} event indicating the updated allowance. This is not
     * required by the EIP. See the note at the beginning of {ERC20}.
     *
     * Requirements:
     *
     * - `sender` and `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     * - the caller must have allowance for ``sender``'s tokens of at least
     * `amount`.
     */
    function transferFrom(address sender, address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(sender, recipient, amount);
        _approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, "ERC20: transfer amount exceeds allowance"));
        return true;
    }

    /**
     * @dev Atomically increases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].add(addedValue));
        return true;
    }

    /**
     * @dev Atomically decreases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `spender` must have allowance for the caller of at least
     * `subtractedValue`.
     */
    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].sub(subtractedValue, "ERC20: decreased allowance below zero"));
        return true;
    }

    /**
     * @dev Moves tokens `amount` from `sender` to `recipient`.
     *
     * This is internal function is equivalent to {transfer}, and can be used to
     * e.g. implement automatic token fees, slashing mechanisms, etc.
     *
     * Emits a {Transfer} event.
     *
     * Requirements:
     *
     * - `sender` cannot be the zero address.
     * - `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     */
    function _transfer(address sender, address recipient, uint256 amount) internal virtual {
        require(sender != address(0), "ERC20: transfer from the zero address");
        require(recipient != address(0), "ERC20: transfer to the zero address");

        _beforeTokenTransfer(sender, recipient, amount);

        _balances[sender] = _balances[sender].sub(amount, "ERC20: transfer amount exceeds balance");
        _balances[recipient] = _balances[recipient].add(amount);
        emit Transfer(sender, recipient, amount);
    }

    /** @dev Creates `amount` tokens and assigns them to `account`, increasing
     * the total supply.
     *
     * Emits a {Transfer} event with `from` set to the zero address.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     */
    function _mint(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: mint to the zero address");

        _beforeTokenTransfer(address(0), account, amount);

        _totalSupply = _totalSupply.add(amount);
        _balances[account] = _balances[account].add(amount);
        emit Transfer(address(0), account, amount);
    }

    /**
     * @dev Destroys `amount` tokens from `account`, reducing the
     * total supply.
     *
     * Emits a {Transfer} event with `to` set to the zero address.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     * - `account` must have at least `amount` tokens.
     */
    function _burn(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: burn from the zero address");

        _beforeTokenTransfer(account, address(0), amount);

        _balances[account] = _balances[account].sub(amount, "ERC20: burn amount exceeds balance");
        _totalSupply = _totalSupply.sub(amount);
        emit Transfer(account, address(0), amount);
    }

    /**
     * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens.
     *
     * This internal function is equivalent to `approve`, and can be used to
     * e.g. set automatic allowances for certain subsystems, etc.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `owner` cannot be the zero address.
     * - `spender` cannot be the zero address.
     */
    function _approve(address owner, address spender, uint256 amount) internal virtual {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");

        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }

    /**
     * @dev Sets {decimals} to a value other than the default one of 18.
     *
     * WARNING: This function should only be called from the constructor. Most
     * applications that interact with token contracts will not expect
     * {decimals} to ever change, and may work incorrectly if it does.
     */
    function _setupDecimals(uint8 decimals_) internal virtual {
        _decimals = decimals_;
    }

    /**
     * @dev Hook that is called before any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * will be to transferred to `to`.
     * - when `from` is zero, `amount` tokens will be minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens will be burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual { }
}

// lib/openzeppelin-contracts/contracts/token/ERC20/SafeERC20.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");
        }
    }
}

// contracts/contracts/wrappers/ConvexStakingWrapper.sol

//Example of a tokenize a convex staked position.
//if used as collateral some modifications will be needed to fit the specific platform

//Based on Curve.fi's gauge wrapper implementations at https://github.com/curvefi/curve-dao-contracts/tree/master/contracts/gauges/wrappers
contract ConvexStakingWrapper is ERC20, ReentrancyGuard {
    using SafeERC20
    for IERC20;
    using SafeMath
    for uint256;

    struct EarnedData {
        address token;
        uint256 amount;
    }

    struct RewardType {
        address reward_token;
        address reward_pool;
        uint256 reward_integral;
        uint256 reward_remaining;
        mapping(address => uint256) reward_integral_for;
        mapping(address => uint256) claimable_reward;
    }

    //constants/immutables
    address public constant convexBooster = address(0xF403C135812408BFbE8713b5A23a04b3D48AAE31);
    address public constant crv = address(0xD533a949740bb3306d119CC777fa900bA034cd52);
    address public constant cvx = address(0x4e3FBD56CD56c3e72c1403e103b45Db9da5B9D2B);
    address public curveToken;
    address public convexToken;
    address public convexPool;
    uint256 public convexPoolId;
    address public collateralVault;
    uint256 private constant CRV_INDEX = 0;
    uint256 private constant CVX_INDEX = 1;

    //rewards
    RewardType[] public rewards;
    mapping(address => uint256) public registeredRewards;
    address public rewardHook;
    mapping(address => address) public rewardRedirect;

    //management
    bool public isShutdown;
    bool public isInit;
    address internal _owner;

    string internal _tokenname;
    string internal _tokensymbol;

    event Deposited(address indexed _user, address indexed _account, uint256 _amount, bool _wrapped);
    event Withdrawn(address indexed _user, uint256 _amount, bool _unwrapped);
    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
    event RewardInvalidated(address _rewardToken);
    event RewardRedirected(address indexed _account, address _forward);
    event RewardAdded(address _token);
    event Shutdown();
    event HookSet(address _hook);
    event UserCheckpoint(address _userA, address _userB);

    constructor() public
        ERC20(
            "StakedConvexToken",
            "stkCvx"
        ){
    }

    function initialize(uint256 _poolId)
    virtual external {
        require(!isInit,"already init");
        _owner = msg.sender;
        emit OwnershipTransferred(address(0), _owner);

        (address _lptoken, address _token, , address _rewards, , ) = IBooster(convexBooster).poolInfo(_poolId);
        curveToken = _lptoken;
        convexToken = _token;
        convexPool = _rewards;
        convexPoolId = _poolId;

        _tokenname = string(abi.encodePacked("Staked ", ERC20(_token).name() ));
        _tokensymbol = string(abi.encodePacked("stk", ERC20(_token).symbol()));
        isShutdown = false;
        isInit = true;

        // collateralVault = _vault;

        //add rewards
        addRewards();
        setApprovals();
    }

    function owner() public view virtual returns(address) {
        return _owner;
    }

    function name() public view override returns (string memory) {
        return _tokenname;
    }

    function symbol() public view override returns (string memory) {
        return _tokensymbol;
    }

    function decimals() public view override returns (uint8) {
        return 18;
    }

    modifier onlyOwner() virtual{
        require(_owner == msg.sender, "Ownable: caller is not the owner");
        _;
    }

    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }

    function renounceOwnership() public virtual onlyOwner {
        emit OwnershipTransferred(_owner, address(0));
        _owner = address(0);
    }

    function shutdown() external onlyOwner {
        isShutdown = true;
        emit Shutdown();
    }

    function setApprovals() public {
        IERC20(curveToken).safeApprove(convexBooster, 0);
        IERC20(curveToken).safeApprove(convexBooster, uint256(-1));
        IERC20(convexToken).safeApprove(convexPool, 0);
        IERC20(convexToken).safeApprove(convexPool, uint256(-1));
    }

    function addRewards() public {
        address mainPool = convexPool;

        if (rewards.length == 0) {
            rewards.push(
                RewardType({
                    reward_token: crv,
                    reward_pool: mainPool,
                    reward_integral: 0,
                    reward_remaining: 0
                })
            );
            rewards.push(
                RewardType({
                    reward_token: cvx,
                    reward_pool: address(0),
                    reward_integral: 0,
                    reward_remaining: 0
                })
            );
            registeredRewards[crv] = CRV_INDEX+1; //mark registered at index+1
            registeredRewards[cvx] = CVX_INDEX+1; //mark registered at index+1
            //send to self to warmup state
            IERC20(crv).transfer(address(this),0);
            //send to self to warmup state
            IERC20(cvx).transfer(address(this),0);
            emit RewardAdded(crv);
            emit RewardAdded(cvx);
        }

        uint256 extraCount = IRewardStaking(mainPool).extraRewardsLength();
        for (uint256 i = 0; i < extraCount; i++) {
            address extraPool = IRewardStaking(mainPool).extraRewards(i);
            address extraToken = IRewardStaking(extraPool).rewardToken();
            //from pool 151, extra reward tokens are wrapped
            if(convexPoolId >= 151){
                extraToken = ITokenWrapper(extraToken).token();
            }
            if(extraToken == cvx){
                //update cvx reward pool address
                rewards[CVX_INDEX].reward_pool = extraPool;
            }else if(registeredRewards[extraToken] == 0){
                //add new token to list
                rewards.push(
                    RewardType({
                        reward_token: extraToken,
                        reward_pool: extraPool,
                        reward_integral: 0,
                        reward_remaining: 0
                    })
                );
                registeredRewards[extraToken] = rewards.length; //mark registered at index+1
                emit RewardAdded(extraToken);
            }
        }
    }

    function addTokenReward(address _token) public virtual onlyOwner {

        //check if not registered yet
        if(registeredRewards[_token] == 0){
            //add new token to list
            rewards.push(
                RewardType({
                    reward_token: _token,
                    reward_pool: address(0),
                    reward_integral: 0,
                    reward_remaining: 0
                })
            );
            //add to registered map
            registeredRewards[_token] = rewards.length; //mark registered at index+1
            //send to self to warmup state
            IERC20(_token).transfer(address(this),0);
            emit RewardAdded(_token);
        }else{
            //get previous used index of given token
            //this ensures that reviving can only be done on the previous used slot
            uint256 index = registeredRewards[_token];
            if(index > 0){
                //index is registeredRewards minus one
                RewardType storage reward = rewards[index-1];
                //check if it was invalidated
                if(reward.reward_token == address(0)){
                    //revive
                    reward.reward_token = _token;
                    emit RewardAdded(_token);
                }
            }
        }
    }

    //allow invalidating a reward if the token causes trouble in calcRewardIntegral
    function invalidateReward(address _token) public onlyOwner {
        uint256 index = registeredRewards[_token];
        if(index > 0){
            //index is registered rewards minus one
            RewardType storage reward = rewards[index-1];
            require(reward.reward_token == _token, "!mismatch");
            //set reward token address to 0, integral calc will now skip
            reward.reward_token = address(0);
            emit RewardInvalidated(_token);
        }
    }

    function setHook(address _hook) external onlyOwner{
        rewardHook = _hook;
        emit HookSet(_hook);
    }

    function rewardLength() external view returns(uint256) {
        return rewards.length;
    }

    function _getDepositedBalance(address _account) internal virtual view returns(uint256) {
        if (_account == address(0) || _account == collateralVault) {
            return 0;
        }
        //get balance from collateralVault

        return balanceOf(_account);
    }

    function _getTotalSupply() internal virtual view returns(uint256){

        //override and add any supply needed (interest based growth)

        return totalSupply();
    }

    //internal transfer function to transfer rewards out on claim
    function _transferReward(address _token, address _to, uint256 _amount) internal virtual{
        IERC20(_token).safeTransfer(_to, _amount);
    }

    function _calcRewardIntegral(uint256 _index, address[2] memory _accounts, uint256[2] memory _balances, uint256 _supply, bool _isClaim) internal{
         RewardType storage reward = rewards[_index];
         if(reward.reward_token == address(0)){
            return;
         }

        //get difference in balance and remaining rewards
        //getReward is unguarded so we use reward_remaining to keep track of how much was actually claimed
        uint256 bal = IERC20(reward.reward_token).balanceOf(address(this));

        //check that balance increased and update integral
        if (_supply > 0 && bal > reward.reward_remaining) {
            reward.reward_integral = reward.reward_integral + (bal.sub(reward.reward_remaining).mul(1e20).div(_supply));
        }

        //update user integrals
        for (uint256 u = 0; u < _accounts.length; u++) {
            //do not give rewards to address 0
            if (_accounts[u] == address(0)) continue;
            if (_accounts[u] == collateralVault) continue;
            if(_isClaim && u != 0) continue; //only update/claim for first address and use second as forwarding

            uint userI = reward.reward_integral_for[_accounts[u]];
            if(_isClaim || userI < reward.reward_integral){
                if(_isClaim){
                    uint256 receiveable = reward.claimable_reward[_accounts[u]].add(_balances[u].mul( reward.reward_integral.sub(userI)).div(1e20));
                    if(receiveable > 0){
                        reward.claimable_reward[_accounts[u]] = 0;
                        //cheat for gas savings by transfering to the second index in accounts list
                        //if claiming only the 0 index will update so 1 index can hold forwarding info
                        //guaranteed to have an address in u+1 so no need to check
                        _transferReward(reward.reward_token, _accounts[u+1], receiveable);
                        bal = bal.sub(receiveable);
                    }
                }else{
                    reward.claimable_reward[_accounts[u]] = reward.claimable_reward[_accounts[u]].add(_balances[u].mul( reward.reward_integral.sub(userI)).div(1e20));
                }
                reward.reward_integral_for[_accounts[u]] = reward.reward_integral;
            }
        }

        //update remaining reward here since balance could have changed if claiming
        if(bal != reward.reward_remaining){
            reward.reward_remaining = bal;
        }
    }

    function _checkpoint(address[2] memory _accounts) internal virtual nonReentrant{
        uint256 supply = _getTotalSupply();
        uint256[2] memory depositedBalance;
        depositedBalance[0] = _getDepositedBalance(_accounts[0]);
        depositedBalance[1] = _getDepositedBalance(_accounts[1]);

        //just in case, dont claim rewards directly if shutdown
        //can still technically claim via unguarded calls but skipping here
        //protects against outside calls reverting
        if(!isShutdown){
            IRewardStaking(convexPool).getReward(address(this), true);
        }
        _claimExtras(false);

        uint256 rewardCount = rewards.length;
        for (uint256 i = 0; i < rewardCount; i++) {
           _calcRewardIntegral(i,_accounts,depositedBalance,supply,false);
        }
        emit UserCheckpoint(_accounts[0],_accounts[1]);
    }

    function _checkpointAndClaim(address[2] memory _accounts) internal virtual nonReentrant{
        uint256 supply = _getTotalSupply();
        uint256[2] memory depositedBalance;
        depositedBalance[0] = _getDepositedBalance(_accounts[0]); //only do first slot

        //just in case, dont claim rewards directly if shutdown
        //can still technically claim via unguarded calls but skipping here
        //protects against outside calls reverting
        if(!isShutdown){
            IRewardStaking(convexPool).getReward(address(this), true);
        }
        _claimExtras(true);

        uint256 rewardCount = rewards.length;
        for (uint256 i = 0; i < rewardCount; i++) {
           _calcRewardIntegral(i,_accounts,depositedBalance,supply,true);
        }
        emit UserCheckpoint(_accounts[0],_accounts[1]);
    }

    //claim any rewards not part of the convex pool
    function _claimExtras(bool /*_isClaim*/) internal virtual{
        //override and add any external reward claiming
        if(rewardHook != address(0)){
            try IRewardHook(rewardHook).onRewardClaim(){
            }catch{}
        }
    }

    function user_checkpoint(address _account) external returns(bool) {
        _checkpoint([_account, address(0)]);
        return true;
    }

    function totalBalanceOf(address _account) external view returns(uint256){
        return _getDepositedBalance(_account);
    }

    //run earned as a mutable function to claim everything before calculating earned rewards
    function earned(address _account) external returns(EarnedData[] memory claimable) {
        //checkpoint to pull in and tally new rewards
        _checkpoint([_account, address(0)]);
        return _earned(_account);
    }

    function _earned(address _account) internal view returns(EarnedData[] memory claimable) {

        uint256 rewardCount = rewards.length;
        claimable = new EarnedData[](rewardCount);

        for (uint256 i = 0; i < rewardCount; i++) {
            RewardType storage reward = rewards[i];
            if(reward.reward_token == address(0)){
                continue;
            }

            claimable[i].amount = reward.claimable_reward[_account];
            claimable[i].token = reward.reward_token;
        }
        return claimable;
    }

    //set any claimed rewards to automatically go to a different address
    //set address to zero to disable
    function setRewardRedirect(address _to) external nonReentrant{
        rewardRedirect[msg.sender] = _to;
        emit RewardRedirected(msg.sender, _to);
    }

    function getReward(address _account) external {
        //check if there is a redirect address
        if(rewardRedirect[_account] != address(0)){
            _checkpointAndClaim([_account, rewardRedirect[_account]]);
        }else{
            //claim directly in checkpoint logic to save a bit of gas
            _checkpointAndClaim([_account, _account]);
        }
    }

    function getReward(address _account, address _forwardTo) external {
        require(msg.sender == _account, "!self");
        //claim directly in checkpoint logic to save a bit of gas
        //pack forwardTo into account array to save gas so that a proxy etc doesnt have to double transfer
        _checkpointAndClaim([_account,_forwardTo]);
    }

    //deposit a curve token
    function deposit(uint256 _amount, address _to) external virtual{
        require(!isShutdown, "shutdown");

        //dont need to call checkpoint since _mint() will

        if (_amount > 0) {
            _mint(_to, _amount);
            IERC20(curveToken).safeTransferFrom(msg.sender, address(this), _amount);
            IConvexDeposits(convexBooster).deposit(convexPoolId, _amount, true);
        }

        emit Deposited(msg.sender, _to, _amount, true);
    }

    //stake a convex token
    function stake(uint256 _amount, address _to) external virtual{
        require(!isShutdown, "shutdown");

        //dont need to call checkpoint since _mint() will

        if (_amount > 0) {
            _mint(_to, _amount);
            IERC20(convexToken).safeTransferFrom(msg.sender, address(this), _amount);
            IRewardStaking(convexPool).stake(_amount);
        }

        emit Deposited(msg.sender, _to, _amount, false);
    }

    //withdraw to convex deposit token
    function withdraw(uint256 _amount) external virtual{

        //dont need to call checkpoint since _burn() will

        if (_amount > 0) {
            _burn(msg.sender, _amount);
            IRewardStaking(convexPool).withdraw(_amount, false);
            IERC20(convexToken).safeTransfer(msg.sender, _amount);
        }

        emit Withdrawn(msg.sender, _amount, false);
    }

    //withdraw to underlying curve lp token
    function withdrawAndUnwrap(uint256 _amount) external virtual{

        //dont need to call checkpoint since _burn() will

        if (_amount > 0) {
            _burn(msg.sender, _amount);
            IRewardStaking(convexPool).withdrawAndUnwrap(_amount, false);
            IERC20(curveToken).safeTransfer(msg.sender, _amount);
        }

        //events
        emit Withdrawn(msg.sender, _amount, true);
    }

    function _beforeTokenTransfer(address _from, address _to, uint256 /*_amount*/) internal virtual override {
        _checkpoint([_from, _to]);
    }

    //helper function
    function earmarkRewards() external returns(bool){
        return IBooster(convexBooster).earmarkRewards(convexPoolId);
    }
}

// contracts/contracts/wrappers/ConvexStakingWrapperMorpho.sol

/*
Staking wrapper for Morpho
Use convex LP positions as collateral while still receiving rewards

This is a non standard token which only mints itself to the morpho vault and disallows all transfers.
Because morpho does state changes before token transfer, the wrapper itself must be the only
entry to morpho to ensure it gets to act first by checkpointing user balances before state changes.

By disabling typical transfers we can reduce gas costs of wrapping when depositing.
Only allow "transfers" out of morpho for withdraws or liquidations.
Override the normal transfer logic for a burn+unwrap to the target address.

The downside of this design is that withdraws and liquidations could cause uncheckpointed rewards to be lost.
As the wrapper has no information on who was liquidated and when, it can not keep track.
For normal withdraws, users will need to claim rewards or checkpoint before removing collateral from Morpho.
*/
contract ConvexStakingWrapperMorpho is ConvexStakingWrapper {
    using SafeERC20
    for IERC20;
    using SafeMath
    for uint256;

    address public immutable morpho;
    bytes32 morphoId;

    constructor(address _morpho) public{
        morpho = _morpho;
    }

    modifier onlyOwner() override{
        require(owner() == msg.sender, "Ownable: caller is not the owner");
        _;
    }

    function owner() public view override returns(address) {
        return IOwner(morpho).owner();
    }

    function initialize(uint256 _poolId)
    override external {
        require(!isInit,"already init");
        emit OwnershipTransferred(address(0), owner());

        (address _lptoken, address _token, , address _rewards, , ) = IBooster(convexBooster).poolInfo(_poolId);
        curveToken = _lptoken;
        convexToken = _token;
        convexPool = _rewards;
        convexPoolId = _poolId;

        _tokenname = string(abi.encodePacked("Staked ", ERC20(_token).name(), " Morpho" ));
        _tokensymbol = string(abi.encodePacked("stk", ERC20(_token).symbol(), "-morpho"));
        isShutdown = false;
        isInit = true;

        //add rewards
        addRewards();
        setApprovals();
        IERC20(address(this)).safeApprove(morpho, uint256(-1));
    }

    function setMorphoId(bytes32 _id) external{
        require(morphoId == bytes32(0), "already set");
        IMorpho.MarketParams memory mp = IMorpho(morpho).idToMarketParams(_id);
        require(mp.collateralToken == address(this),"invalid id");
        morphoId = _id;
    }

    //4626 interface
    function asset() external view returns(address){
        return curveToken;
    }

    //wrapped erc20 interface
    function underlying() external view returns(address){
        return curveToken;
    }

    //deposit a curve token, wrap, and supply collateral to morpho
    function _depositToMorpho(IMorpho.MarketParams memory marketParams, uint256 assets, address onBehalf, bytes memory data) internal returns (bool){
        require(!isShutdown, "shutdown");

        //call checkpoint on onBehalf
        _checkpoint([onBehalf, address(0)]);

        if (assets > 0) {
            //mint directly on morpho
            //this is gas trickery as we can skip transfer logic when supplying
            //so that we're not paying an extra transfer
            _mint(morpho, assets);
            IERC20(curveToken).safeTransferFrom(msg.sender, address(this), assets);
            IConvexDeposits(convexBooster).deposit(convexPoolId, assets, true);

            //supply to morpho
            //checkpointed above so safe to change morpho state of onBehalf
            IMorpho(morpho).supplyCollateral(marketParams, assets, onBehalf, data);
        }

        emit Deposited(msg.sender, onBehalf, assets, true);
        return true;
    }

    //normal deposit
    function deposit(uint256 _amount, address _to) external override{
        //gracefully do nothing
    }

    //wrapped erc20 interface
    function depositFor(address _to, uint256 _amount) external returns (bool){
        return _depositToMorpho(IMorpho(morpho).idToMarketParams(morphoId), _amount, _to, new bytes(0));
    }

    function stake(uint256 _amount, address _to) external override{
        //gracefully do nothing
    }

    function withdraw(uint256 _amount) external override{
        //gracefully do nothing
    }

    function withdrawAndUnwrap(uint256 _amount) external override{
        //gracefully do nothing
    }

    function _getDepositedBalance(address _account) internal override view returns(uint256) {
        if (_account == address(0) || _account == morpho) {
            return 0;
        }

        //return morpho collateral balance (can ignore wrapper token balance)
        return IMorpho(morpho).position(morphoId, _account).collateral;
    }

    function _beforeTokenTransfer(address /*_from*/, address /*_to*/, uint256 /*_amount*/) internal override {
        //dont need to checkpoint as we already are doing so directly in deposit
    }

    function _transfer(address _from, address _to, uint256 _amount) internal override {
        //Only legit transfer is from morpho
        //which doesnt even transfer but just burns+unwraps to the target.
        //Let other transfers fail without error.
        if(_from == morpho){

            //normally we would do a checkpoint before burning...
            //however since a liquidation will cause a
            //user to lose their uncheckedpointed rewards, a checkpoint here would brick those rewards.
            //if we dont checkpoint now then those rewards could be at least distributed
            //to the remaining users
            // _checkpoint([address(0),address(0)]);

            //unwrap to curve lp token and transfer that instead
            if (_amount > 0) {
                _burn(_from, _amount);
                IRewardStaking(convexPool).withdrawAndUnwrap(_amount, false);
                IERC20(curveToken).safeTransfer(_to, _amount);
                emit Withdrawn(_from, _amount, true);
                emit Transfer(_from, _to, _amount);
            }
        }else if(_from != address(this)){
            require(_to != morpho, "!invalid transfer");
            //any other call to transfer just act as a checkpoint instead of actually transferring
            //..just checkpoint to as this is more of a workaround to get a checkpoint in to a specific address
            //   and we dont have to pay for check pointing 2 addresses
            _checkpoint([_to, address(0)]);
        }
    }
}

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