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/**
 *Submitted for verification at fraxscan.com on 2024-05-24
*/

// SPDX-License-Identifier: AGPL-3.0-only
pragma solidity 0.8.19;

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

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

/**
 * @dev Interface of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in
 * https://eips.ethereum.org/EIPS/eip-2612[EIP-2612].
 *
 * Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by
 * presenting a message signed by the account. By not relying on {IERC20-approve}, the token holder account doesn't
 * need to send a transaction, and thus is not required to hold Ether at all.
 */
interface IERC20Permit {
    /**
     * @dev Sets `value` as the allowance of `spender` over ``owner``'s tokens,
     * given ``owner``'s signed approval.
     *
     * IMPORTANT: The same issues {IERC20-approve} has related to transaction
     * ordering also apply here.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `deadline` must be a timestamp in the future.
     * - `v`, `r` and `s` must be a valid `secp256k1` signature from `owner`
     * over the EIP712-formatted function arguments.
     * - the signature must use ``owner``'s current nonce (see {nonces}).
     *
     * For more information on the signature format, see the
     * https://eips.ethereum.org/EIPS/eip-2612#specification[relevant EIP
     * section].
     */
    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;

    /**
     * @dev Returns the current nonce for `owner`. This value must be
     * included whenever a signature is generated for {permit}.
     *
     * Every successful call to {permit} increases ``owner``'s nonce by one. This
     * prevents a signature from being used multiple times.
     */
    function nonces(address owner) external view returns (uint256);

    /**
     * @dev Returns the domain separator used in the encoding of the signature for {permit}, as defined by {EIP712}.
     */
    // solhint-disable-next-line func-name-mixedcase
    function DOMAIN_SEPARATOR() external view returns (bytes32);
}

/**
 * @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
     *
     * Furthermore, `isContract` will also return true if the target contract within
     * the same transaction is already scheduled for destruction by `SELFDESTRUCT`,
     * which only has an effect at the end of a transaction.
     * ====
     *
     * [IMPORTANT]
     * ====
     * You shouldn't rely on `isContract` to protect against flash loan attacks!
     *
     * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
     * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
     * constructor.
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize/address.code.length, which returns 0
        // for contracts in construction, since the code is only stored at the end
        // of the constructor execution.

        return account.code.length > 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://consensys.net/diligence/blog/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/v0.8.0/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");

        (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 functionCallWithValue(target, data, 0, "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");
        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResultFromTarget(target, 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) {
        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResultFromTarget(target, 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) {
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verify that a low level call to smart-contract was successful, and revert (either by bubbling
     * the revert reason or using the provided one) in case of unsuccessful call or if target was not a contract.
     *
     * _Available since v4.8._
     */
    function verifyCallResultFromTarget(
        address target,
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        if (success) {
            if (returndata.length == 0) {
                // only check isContract if the call was successful and the return data is empty
                // otherwise we already know that it was a contract
                require(isContract(target), "Address: call to non-contract");
            }
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }

    /**
     * @dev Tool to verify that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason or using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }

    function _revert(bytes memory returndata, string memory errorMessage) private pure {
        // 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
            /// @solidity memory-safe-assembly
            assembly {
                let returndata_size := mload(returndata)
                revert(add(32, returndata), returndata_size)
            }
        } else {
            revert(errorMessage);
        }
    }
}

interface IFeeDistributor {
    function claim() external returns (uint256);

    function token() external view returns (address);

    function checkpoint_token() external;

    function checkpoint_total_supply() external;

    function recover_balance(address token) external;

    function kill_me() external;

    function emergency_return() external returns (address);

    function admin() external returns (address);
}

interface IVeToken {
    struct LockedBalance {
        int128 amount;
        uint256 end;
    }

    function create_lock(uint256 _value, uint256 _unlock_time) external;

    function increase_amount(uint256 _value) external;

    function increase_unlock_time(uint256 _unlock_time) external;

    function withdraw() external;

    function locked__end(address) external view returns (uint256);

    function balanceOf(address) external view returns (uint256);
}

interface IVestedFXS {
    function balanceOf(address _addr) external view returns (uint256);

    function createLock(address _addr, uint256 _value, uint128 _unlockTime)
        external
        returns (uint128 index_, uint256 newLockId_);

    function increaseAmount(uint256 _value, uint128 _lockIndex) external;

    function increaseUnlockTime(uint128 _unlockTime, uint128 _lockIndex) external;

    function lockedEnd(address _addr, uint128 _lockIndex) external view returns (uint256);

    function nextId(address _addr) external view returns (uint256);

    function withdraw(uint128 _lockIndex) external;
}

interface IYieldDistributor {
    function getYield() external returns (uint256);

    function checkpoint() external;

    function userVeFXSCheckpointed(address _user) external view returns (uint256);
}

/**
 * @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 Address for address;

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

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

    /**
     * @dev 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'
        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));
    }

    /**
     * @dev Increase the calling contract's allowance toward `spender` by `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 oldAllowance = token.allowance(address(this), spender);
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, oldAllowance + value));
    }

    /**
     * @dev Decrease the calling contract's allowance toward `spender` by `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        unchecked {
            uint256 oldAllowance = token.allowance(address(this), spender);
            require(oldAllowance >= value, "SafeERC20: decreased allowance below zero");
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, oldAllowance - value));
        }
    }

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

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

    /**
     * @dev Use a ERC-2612 signature to set the `owner` approval toward `spender` on `token`.
     * Revert on invalid signature.
     */
    function safePermit(
        IERC20Permit token,
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal {
        uint256 nonceBefore = token.nonces(owner);
        token.permit(owner, spender, value, deadline, v, r, s);
        uint256 nonceAfter = token.nonces(owner);
        require(nonceAfter == nonceBefore + 1, "SafeERC20: permit did not succeed");
    }

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

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

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

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

/// @title  VeCRVLocker
/// @notice Locker contract for locking tokens for a period of time compatible with the Voting Escrow contract from Curve
/// @author Stake DAO
/// @custom:contact [email protected]
abstract contract VeCRVLocker {
    using SafeERC20 for IERC20;

    /// @notice Address of the depositor which will mint sdTokens.
    address public depositor;

    /// @notice Address of the accumulator which will accumulate rewards.
    address public accumulator;

    /// @notice Address of the governance contract.
    address public governance;

    /// @notice Address of the future governance contract.
    address public futureGovernance;

    /// @notice Address of the token being locked.
    address public immutable token;

    /// @notice Address of the Voting Escrow contract.
    address public immutable veToken;

    ////////////////////////////////////////////////////////////////
    /// --- EVENTS & ERRORS
    ///////////////////////////////////////////////////////////////

    /// @notice Event emitted when tokens are released from the locker.
    /// @param user Address who released the tokens.
    /// @param value Amount of tokens released.
    event Released(address indexed user, uint256 value);

    /// @notice Event emitted when a lock is created.
    /// @param value Amount of tokens locked.
    /// @param duration Duration of the lock.
    event LockCreated(uint256 value, uint256 duration);

    /// @notice Event emitted when a lock is increased.
    /// @param value Amount of tokens locked.
    /// @param duration Duration of the lock.
    event LockIncreased(uint256 value, uint256 duration);

    /// @notice Event emitted when the depositor is changed.
    /// @param newDepositor Address of the new depositor.
    event DepositorChanged(address indexed newDepositor);

    /// @notice Event emitted when the accumulator is changed.
    /// @param newAccumulator Address of the new accumulator.
    event AccumulatorChanged(address indexed newAccumulator);

    /// @notice Event emitted when a new governance is proposed.
    event GovernanceProposed(address indexed newGovernance);

    /// @notice Event emitted when the governance is changed.
    event GovernanceChanged(address indexed newGovernance);

    /// @notice Throws if caller is not the governance.
    error GOVERNANCE();

    /// @notice Throws if caller is not the governance or depositor.
    error GOVERNANCE_OR_DEPOSITOR();

    /// @notice Throws if caller is not the governance or depositor.
    error GOVERNANCE_OR_ACCUMULATOR();

    ////////////////////////////////////////////////////////////////
    /// --- MODIFIERS
    ///////////////////////////////////////////////////////////////

    modifier onlyGovernance() {
        if (msg.sender != governance) revert GOVERNANCE();
        _;
    }

    modifier onlyGovernanceOrDepositor() {
        if (msg.sender != governance && msg.sender != depositor) revert GOVERNANCE_OR_DEPOSITOR();
        _;
    }

    modifier onlyGovernanceOrAccumulator() {
        if (msg.sender != governance && msg.sender != accumulator) revert GOVERNANCE_OR_ACCUMULATOR();
        _;
    }

    constructor(address _governance, address _token, address _veToken) {
        token = _token;
        veToken = _veToken;
        governance = _governance;
    }

    /// @dev Returns the name of the locker.
    function name() public pure virtual returns (string memory) {
        return "VeCRV Locker";
    }

    ////////////////////////////////////////////////////////////////
    /// --- LOCKER MANAGEMENT
    ///////////////////////////////////////////////////////////////

    /// @notice Create a lock for the contract on the Voting Escrow contract.
    /// @param _value Amount of tokens to lock
    /// @param _unlockTime Duration of the lock
    function createLock(uint256 _value, uint256 _unlockTime) external virtual onlyGovernanceOrDepositor {
        IERC20(token).safeApprove(veToken, type(uint256).max);
        IVeToken(veToken).create_lock(_value, _unlockTime);

        emit LockCreated(_value, _unlockTime);
    }

    /// @notice Increase the lock amount or duration for the contract on the Voting Escrow contract.
    /// @param _value Amount of tokens to lock
    /// @param _unlockTime Duration of the lock
    function increaseLock(uint256 _value, uint256 _unlockTime) external virtual onlyGovernanceOrDepositor {
        if (_value > 0) {
            IVeToken(veToken).increase_amount(_value);
        }

        if (_unlockTime > 0) {
            bool _canIncrease = (_unlockTime / 1 weeks * 1 weeks) > (IVeToken(veToken).locked__end(address(this)));

            if (_canIncrease) {
                IVeToken(veToken).increase_unlock_time(_unlockTime);
            }
        }

        emit LockIncreased(_value, _unlockTime);
    }

    /// @notice Claim the rewards from the fee distributor.
    /// @param _feeDistributor Address of the fee distributor.
    /// @param _token Address of the token to claim.
    /// @param _recipient Address to send the tokens to.
    function claimRewards(address _feeDistributor, address _token, address _recipient)
        external
        virtual
        onlyGovernanceOrAccumulator
    {
        uint256 claimed = IFeeDistributor(_feeDistributor).claim();

        if (_recipient != address(0)) {
            IERC20(_token).safeTransfer(_recipient, claimed);
        }
    }

    /// @notice Release the tokens from the Voting Escrow contract when the lock expires.
    /// @param _recipient Address to send the tokens to
    function release(address _recipient) external virtual onlyGovernance {
        IVeToken(veToken).withdraw();

        uint256 _balance = IERC20(token).balanceOf(address(this));
        IERC20(token).safeTransfer(_recipient, _balance);

        emit Released(msg.sender, _balance);
    }

    ////////////////////////////////////////////////////////////////
    /// --- GOVERNANCE PARAMETERS
    ///////////////////////////////////////////////////////////////

    /// @notice Transfer the governance to a new address.
    /// @param _governance Address of the new governance.
    function transferGovernance(address _governance) external onlyGovernance {
        emit GovernanceProposed(futureGovernance = _governance);
    }

    /// @notice Accept the governance transfer.
    function acceptGovernance() external {
        if (msg.sender != futureGovernance) revert GOVERNANCE();
        emit GovernanceChanged(governance = msg.sender);
    }

    /// @notice Change the depositor address.
    /// @param _depositor Address of the new depositor.
    function setDepositor(address _depositor) external onlyGovernance {
        emit DepositorChanged(depositor = _depositor);
    }

    function setAccumulator(address _accumulator) external onlyGovernance {
        emit AccumulatorChanged(accumulator = _accumulator);
    }

    /// @notice Execute an arbitrary transaction as the governance.
    /// @param to Address to send the transaction to.
    /// @param value Amount of ETH to send with the transaction.
    /// @param data Encoded data of the transaction.
    function execute(address to, uint256 value, bytes calldata data)
        external
        payable
        virtual
        onlyGovernance
        returns (bool, bytes memory)
    {
        (bool success, bytes memory result) = to.call{value: value}(data);
        return (success, result);
    }

    receive() external payable {}
}

/// @title Locker
/// @notice Locks the FXS tokens to veFXS contract
/// @author StakeDAO
/// @custom:contact [email protected]
contract FxsLockerFraxtal is VeCRVLocker {
    using SafeERC20 for IERC20;

    /// @notice Throws if a low leve call failed.
    error CallFailed();

    /// @notice Throws if the lock is already created.
    error LockAlreadyCreated();

    //////////////////////////////////////////////////////
    /// --- CONSTRUCTOR
    //////////////////////////////////////////////////////

    /// @notice Constructor
    /// @param _governance Address of the governance
    /// @param _token Address of the token to lock
    /// @param _veToken Address of the veToken
    /// @param _delegationRegistry Address of the fraxtal delegation registry
    /// @param _initialDelegate Address of the delegate that receives network reward
    constructor(
        address _governance,
        address _token,
        address _veToken,
        address _delegationRegistry,
        address _initialDelegate
    ) VeCRVLocker(_governance, _token, _veToken) {
        // Custom code for Fraxtal
        // set _initialDelegate as delegate
        (bool success,) =
            _delegationRegistry.call(abi.encodeWithSignature("setDelegationForSelf(address)", _initialDelegate));
        if (!success) revert CallFailed();
        // disable self managing delegation
        (success,) = _delegationRegistry.call(abi.encodeWithSignature("disableSelfManagingDelegations()"));
        if (!success) revert CallFailed();
    }

    /// @dev Returns the name of the locker.
    function name() public pure override returns (string memory) {
        return "FXS Locker";
    }

    /* ========== MUTATIVE FUNCTIONS ========== */
    /// @notice Creates a lock by locking FXS token in the veFXS contract for the specified time
    /// @dev Can only be called by governance or depositor
    /// @param _value The amount of token to be locked
    /// @param _unlockTime The duration for which the token is to be locked
    function createLock(uint256 _value, uint256 _unlockTime) external override onlyGovernanceOrDepositor {
        // constrain the locker to create at most one lock
        if (IVestedFXS(veToken).nextId(address(this)) != 0) revert LockAlreadyCreated();

        IERC20(token).safeApprove(veToken, type(uint256).max);
        IVestedFXS(veToken).createLock(address(this), _value, uint128(_unlockTime));

        emit LockCreated(_value, _unlockTime);
    }

    /// @notice Increase the lock amount or duration for the contract on the Voting Escrow contract.
    /// @param _value Amount of tokens to lock
    /// @param _unlockTime Duration of the lock
    function increaseLock(uint256 _value, uint256 _unlockTime) external override onlyGovernanceOrDepositor {
        if (_value != 0) {
            IVestedFXS(veToken).increaseAmount(_value, 0); // lock index = 0
        }

        if (_unlockTime != 0) {
            bool _canIncrease = (_unlockTime / 1 weeks * 1 weeks) > (IVestedFXS(veToken).lockedEnd(address(this), 0));

            if (_canIncrease) {
                IVestedFXS(veToken).increaseUnlockTime(uint128(_unlockTime), 0); // lock index = 0
            }
        }

        emit LockIncreased(_value, _unlockTime);
    }

    /// @notice Withdraw the FXS from veFXS
    /// @dev call only after lock time expires
    /// @param _recipient The address which will receive the released FXS
    function release(address _recipient) external override onlyGovernance {
        IVestedFXS(veToken).withdraw(0); // lock index = 0

        uint256 _balance = IERC20(token).balanceOf(address(this));
        IERC20(token).safeTransfer(_recipient, _balance);

        emit Released(msg.sender, _balance);
    }

    /// @notice Claim the rewards from the yield distributor.
    /// @param _yieldDistributor Address of the yield distributor.
    /// @param _token Address of the token to claim and transfer.
    /// @param _recipient Address to send the tokens to.
    function claimRewards(address _yieldDistributor, address _token, address _recipient)
        external
        override
        onlyGovernanceOrAccumulator
    {
        uint256 snapshotBalance = IERC20(_token).balanceOf(address(this));

        IYieldDistributor(_yieldDistributor).getYield();

        uint256 yield = IERC20(_token).balanceOf(address(this)) - snapshotBalance;

        if (yield != 0) {
            IERC20(_token).transfer(_recipient, yield);
        }
    }
}

• No Contract Security Audit Submitted- Submit Audit Here

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000000000000000000000000000755fbe4a24d7478bfcfc1e561afce82d1ff62000000000000000000000000fc00000000000000000000000000000000000002000000000000000000000000007fd070a7e1b0fa1364044a373ac1339bad89cf000000000000000000000000f5ca906f05cafa944c27c6881bed3dfd3a785b6a000000000000000000000000b0552b6860ce5c0202976db056b5e3cc4f9cc765

-----Decoded View---------------
Arg [0] : _governance (address): 0x000755Fbe4A24d7478bfcFC1E561AfCE82d1ff62
Arg [1] : _token (address): 0xFc00000000000000000000000000000000000002
Arg [2] : _veToken (address): 0x007FD070a7E1B0fA1364044a373Ac1339bAD89CF
Arg [3] : _delegationRegistry (address): 0xF5cA906f05cafa944c27c6881bed3DFd3a785b6A
Arg [4] : _initialDelegate (address): 0xB0552b6860CE5C0202976Db056b5e3Cc4f9CC765

-----Encoded View---------------
5 Constructor Arguments found :
Arg [0] : 000000000000000000000000000755fbe4a24d7478bfcfc1e561afce82d1ff62
Arg [1] : 000000000000000000000000fc00000000000000000000000000000000000002
Arg [2] : 000000000000000000000000007fd070a7e1b0fa1364044a373ac1339bad89cf
Arg [3] : 000000000000000000000000f5ca906f05cafa944c27c6881bed3dfd3a785b6a
Arg [4] : 000000000000000000000000b0552b6860ce5c0202976db056b5e3cc4f9cc765

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