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•  contract StakingV3Proxy *
•    - function maintenance()
•    - function setMaintenance(bool _mainten ...
•    - function proxyOwner()
•    - function setUpgradeabilityOwner(addre ...
•    - function transferProxyOwnership(addre ...
•    - function upgradeTo(address newImpleme ...
•    - function upgradeToAndCall(address new ...
•    - function implementation()
•    - function setImplementation(address ne ...
•    - function _upgradeTo(address newImplem ...
•    - function _fallback()

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/**
 *Submitted for verification at Etherscan.io on 2023-06-27
*/

// SPDX-License-Identifier: Apache-2.0
pragma solidity =0.8.19; 


/**
 * @title OwnedUpgradeabilityProxy
 * @dev This contract combines an upgradeability proxy with basic authorization control functionalities
 */
 
contract StakingV3Proxy {
    /**
     * @dev Event to show ownership has been transferred
     * @param previousOwner representing the address of the previous owner
     * @param newOwner representing the address of the new owner
     */
    event ProxyOwnershipTransferred(address previousOwner, address newOwner);

    /**
     * @dev This event will be emitted every time the implementation gets upgraded
     * @param implementation representing the address of the upgraded implementation
     */
    event Upgraded(address indexed implementation);

    // Storage position of the address of the maintenance boolean
    bytes32 private constant maintenancePosition = keccak256("com.proxy.maintenance");
    // Storage position of the address of the current implementation
    bytes32 private constant implementationPosition = keccak256("com.proxy.implementation");
    // Storage position of the owner of the contract
    bytes32 private constant proxyOwnerPosition = keccak256("com.proxy.owner");

    /**
     * @dev the constructor sets the original owner of the contract to the sender account.
     */
    constructor() {
        setUpgradeabilityOwner(msg.sender);
    }

    /**
     * @dev Tells if contract is on maintenance
     * @return _maintenance if contract is on maintenance
     */
    function maintenance() public view returns (bool _maintenance) {
        bytes32 position = maintenancePosition;
        assembly {
            _maintenance := sload(position)
        }
    }

    /**
     * @dev Sets if contract is on maintenance
     */
    function setMaintenance(bool _maintenance) external onlyProxyOwner {
        bytes32 position = maintenancePosition;
        assembly {
            sstore(position, _maintenance)
        }
    }

    /**
     * @dev Tells the address of the owner
     * @return owner the address of the owner
     */
    function proxyOwner() public view returns (address owner) {
        bytes32 position = proxyOwnerPosition;
        assembly {
            owner := sload(position)
        }
    }

    /**
     * @dev Sets the address of the owner
     */
    function setUpgradeabilityOwner(address newProxyOwner) internal {
        bytes32 position = proxyOwnerPosition;
        assembly {
            sstore(position, newProxyOwner)
        }
    }

    /**
     * @dev Allows the current owner to transfer control of the contract to a newOwner.
     * @param newOwner The address to transfer ownership to.
     */
    function transferProxyOwnership(address newOwner) public onlyProxyOwner {
        require(newOwner != address(0), 'OwnedUpgradeabilityProxy: INVALID');
        emit ProxyOwnershipTransferred(proxyOwner(), newOwner);
        setUpgradeabilityOwner(newOwner);
    }

    /*
     * @dev Allows the proxy owner to upgrade the current version of the proxy.
     * @param implementation representing the address of the new implementation to be set.
     */
    function upgradeTo(address newImplementation) public onlyProxyOwner {
        _upgradeTo(newImplementation);
    }

    /*
     * @dev Allows the proxy owner to upgrade the current version of the proxy and call the new implementation
     * to initialize whatever is needed through a low level call.
     * @param implementation representing the address of the new implementation to be set.
     * @param data represents the msg.data to bet sent in the low level call. This parameter may include the function
     * signature of the implementation to be called with the needed payload
     */
    function upgradeToAndCall(address newImplementation, bytes memory data) payable public onlyProxyOwner {
        upgradeTo(newImplementation);
        (bool success, ) = address(this).call{ value: msg.value }(data);
        require(success, "OwnedUpgradeabilityProxy: INVALID");
    }

    /**
     * @dev Fallback function allowing to perform a delegatecall to the given implementation.
     * This function will return whatever the implementation call returns
     */
    fallback() external payable {
        _fallback();
    }

    receive () external payable {
        _fallback();
    }

    /**
     * @dev Tells the address of the current implementation
     * @return impl address of the current implementation
     */
    function implementation() public view returns (address impl) {
        bytes32 position = implementationPosition;
        assembly {
            impl := sload(position)
        }
    }

    /**
     * @dev Sets the address of the current implementation
     * @param newImplementation address representing the new implementation to be set
     */
    function setImplementation(address newImplementation) internal {
        bytes32 position = implementationPosition;
        assembly {
            sstore(position, newImplementation)
        }
    }

    /**
     * @dev Upgrades the implementation address
     * @param newImplementation representing the address of the new implementation to be set
     */
    function _upgradeTo(address newImplementation) internal {
        address currentImplementation = implementation();
        require(currentImplementation != newImplementation, 'OwnedUpgradeabilityProxy: INVALID');
        setImplementation(newImplementation);
        emit Upgraded(newImplementation);
    }

    function _fallback() internal {
        if (maintenance()) {
            require(msg.sender == proxyOwner(), 'OwnedUpgradeabilityProxy: FORBIDDEN');
        }
        address _impl = implementation();
        require(_impl != address(0), 'OwnedUpgradeabilityProxy: INVALID');
        assembly {
            let ptr := mload(0x40)
            calldatacopy(ptr, 0, calldatasize())
            let result := delegatecall(gas(), _impl, ptr, calldatasize(), 0, 0)
            let size := returndatasize()
            returndatacopy(ptr, 0, size)

            switch result
            case 0 { revert(ptr, size) }
            default { return(ptr, size) }
        }
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyProxyOwner() {
        require(msg.sender == proxyOwner(), 'OwnedUpgradeabilityProxy: FORBIDDEN');
        _;
    }
}

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[{"inputs":[],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":false,"internalType":"address","name":"newOwner","type":"address"}],"name":"ProxyOwnershipTransferred","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"implementation","type":"address"}],"name":"Upgraded","type":"event"},{"stateMutability":"payable","type":"fallback"},{"inputs":[],"name":"implementation","outputs":[{"internalType":"address","name":"impl","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"maintenance","outputs":[{"internalType":"bool","name":"_maintenance","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"proxyOwner","outputs":[{"internalType":"address","name":"owner","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bool","name":"_maintenance","type":"bool"}],"name":"setMaintenance","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferProxyOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newImplementation","type":"address"}],"name":"upgradeTo","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newImplementation","type":"address"},{"internalType":"bytes","name":"data","type":"bytes"}],"name":"upgradeToAndCall","outputs":[],"stateMutability":"payable","type":"function"},{"stateMutability":"payable","type":"receive"}]

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