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 contract HYProxy *    - function proxyOwner()    - function pendingProxyOwner()    - function _setUpgradeabilityOwner(addr ...    - function _setPendingUpgradeabilityOwn ...    - function transferProxyOwnership(addre ...    - function claimProxyOwnership()    - function upgradeTo(address _implement ...    - function implementation()    - function proxyCall()

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/**
 *Submitted for verification at BscScan.com on 2024-04-20
*/

// SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.8.17;

contract HYProxy {

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

    event NewPendingOwner(address currentOwner, address pendingOwner);

    bytes32 private constant proxyOwnerPosition = 0xf005ebe468325afe0f5219e39c3e5c78f6c18e3412a833feb9745970eb217225;
    bytes32 private constant pendingProxyOwnerPosition = 0xe67d95b0c1182ffbe33735d24cc48f2bd2200ee2e05231a79238e4efbba73712;
    bytes32 private constant implementationPosition = 0x68608d6f98cee99e6ef572e612d358e8697b1270a79f86c857431457b81f603e;

    event Upgraded(address indexed implementation);

    constructor()  {
        _setUpgradeabilityOwner(msg.sender);
    }

    modifier onlyProxyOwner() {
        require(msg.sender == proxyOwner(), "only Proxy Owner");
        _;
    }

    modifier onlyPendingProxyOwner() {
        require(msg.sender == pendingProxyOwner(), "only pending Proxy Owner");
        _;
    }

    function proxyOwner() public view returns (address owner) {
        bytes32 position = proxyOwnerPosition;
        assembly {
            owner := sload(position)
        }
    }

    function pendingProxyOwner() public view returns (address pendingOwner) {
        bytes32 position = pendingProxyOwnerPosition;
        assembly {
            pendingOwner := sload(position)
        }
    }

    function _setUpgradeabilityOwner(address newProxyOwner) internal {
        bytes32 position = proxyOwnerPosition;
        assembly {
            sstore(position, newProxyOwner)
        }
    }

    function _setPendingUpgradeabilityOwner(address newPendingProxyOwner) internal {
        bytes32 position = pendingProxyOwnerPosition;
        assembly {
            sstore(position, newPendingProxyOwner)
        }
    }

    function transferProxyOwnership(address newOwner) external onlyProxyOwner {
        require(newOwner != address(0));
        _setPendingUpgradeabilityOwner(newOwner);
        emit NewPendingOwner(proxyOwner(), newOwner);
    }

    function claimProxyOwnership() external onlyPendingProxyOwner {
        emit ProxyOwnershipTransferred(proxyOwner(), pendingProxyOwner());
        _setUpgradeabilityOwner(pendingProxyOwner());
        _setPendingUpgradeabilityOwner(address(0));
    }

    function upgradeTo(address _implementation) public virtual onlyProxyOwner {
        address currentImplementation;
        bytes32 position = implementationPosition;
        assembly {
            currentImplementation := sload(position)
        }
        require(currentImplementation != _implementation);
        assembly {
            sstore(position, _implementation)
        }
        emit Upgraded(_implementation);
    }

    function implementation() public view returns (address impl) {
        bytes32 position = implementationPosition;
        assembly {
            impl := sload(position)
        }
    }

    fallback() external payable {
        proxyCall();
    }

    receive() external payable {
        proxyCall();
    }

    function proxyCall() internal {
        bytes32 position = implementationPosition;

        assembly {
            let ptr := mload(0x40)
            calldatacopy(ptr, returndatasize(), calldatasize())
            let result := delegatecall(gas(), sload(position), ptr, calldatasize(), returndatasize(), returndatasize())
            returndatacopy(ptr, 0, returndatasize())

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

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[{"inputs":[],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"currentOwner","type":"address"},{"indexed":false,"internalType":"address","name":"pendingOwner","type":"address"}],"name":"NewPendingOwner","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"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":"claimProxyOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"implementation","outputs":[{"internalType":"address","name":"impl","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"pendingProxyOwner","outputs":[{"internalType":"address","name":"pendingOwner","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"proxyOwner","outputs":[{"internalType":"address","name":"owner","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferProxyOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_implementation","type":"address"}],"name":"upgradeTo","outputs":[],"stateMutability":"nonpayable","type":"function"},{"stateMutability":"payable","type":"receive"}]

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ipfs://a28dbb7ecc16984c967a6373fe5b6685c036131983c66f1ac406c9350497220a