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// SPDX-License-Identifier: Unlicense
pragma solidity ^0.8.0;

import "@openzeppelin/contracts/proxy/Proxy.sol";
import "./interface/IERC897Proxy.sol";

contract HSKProxy is Proxy, IERC897Proxy {
    bytes32 internal constant IMPLEMENTATION_SLOT = keccak256("hsk.proxy.implementation");

    bytes32 internal constant STATUS_SLOT = keccak256("hsk.proxy.status");

    bytes32 internal constant OWNER_SLOT = keccak256("hsk.proxy.owner");

    bytes32 internal constant UPGRADER_SLOT_TAG = keccak256("hsk.proxy.upgraderTag");

    bytes32 internal constant PAUSER_SLOT_TAG = keccak256("hsk.proxy.pauserTag");

    /// @dev Emitted when the administration has been transferred.
    event OwnerChanged(address indexed previousOwner, address indexed newOwner);

    /// @dev Emitted when the upgrader is updated.
    event SetUpgrader(address indexed account, bool enable);

    /// @dev Emitted when the pauser is updated.
    event SetPauser(address indexed account, bool enable);

    /// @dev Emitted when the implementation is upgraded.
    event Upgraded(address indexed implementation);

    /// @dev Proxy status is updated.
    event StatusUpdated(bool status);

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

    modifier canUpgrade() {
        require(msg.sender == _owner() || _isUpgrader(msg.sender), "Proxy: is not owner or upgrader");
        _;
    }

    modifier canPause() {
        require(msg.sender == _owner() || _isPauser(msg.sender), "Proxy: is not owner or pauser");
        _;
    }

    constructor(address _impl, address _implOwner, address _proxyOwner) {
        _upgradeToAndCall(_impl, abi.encodeWithSelector(bytes4(keccak256("init(address)")), _implOwner));
        _setOwner(_proxyOwner);
        _setStatus(true);
    }

    function _implementation() internal view override returns (address impl) {
        bytes32 slot = IMPLEMENTATION_SLOT;
        // solhint-disable-next-line no-inline-assembly
        assembly {
            impl := sload(slot)
        }
    }

    function _beforeFallback() internal view override {
        require(_status(), "Proxy: proxy is not active");
    }

    /// @dev Sets the implementation address of the proxy.
    /// @param _impl Address of the new implementation.
    function _setImplementation(address _impl) internal {
        require(_impl.code.length > 0, "Proxy: not a contract address");

        bytes32 slot = IMPLEMENTATION_SLOT;
        // solhint-disable-next-line no-inline-assembly
        assembly {
            sstore(slot, _impl)
        }
    }

    /**
    * @dev Upgrades the proxy to a new implementation.
    * @param newImplementation Address of the new implementation.
    */
    function _upgradeTo(address newImplementation) internal {
        _setImplementation(newImplementation);
        emit Upgraded(newImplementation);
    }

    /// @dev Upgrade the implementation of the proxy and call a function on the new implementation.
    /// @param _impl Address of the new implementation.
    /// @param data Data to send as msg.data in the low level call.
    function _upgradeToAndCall(address _impl, bytes memory data) internal {
        _upgradeTo(_impl);
        if (data.length > 0) {
            // solhint-disable-next-line avoid-low-level-calls
            (bool ok, ) = _impl.delegatecall(data);
            require(ok, "Proxy: delegateCall failed");
        }
    }

    /// @dev Return proxy status
    function _status() internal view returns (bool active) {
        bytes32 slot = STATUS_SLOT;
        // solhint-disable-next-line no-inline-assembly
        assembly {
            active := sload(slot)
        }
    }

    /// @dev Set proxy status
    function _setStatus(bool active) internal {
        bytes32 slot = STATUS_SLOT;
        // solhint-disable-next-line no-inline-assembly
        assembly {
            sstore(slot, active)
        }
    }

    /// @dev Return the owner slot.
    function _owner() internal view returns (address account) {
        bytes32 slot = OWNER_SLOT;
        // solhint-disable-next-line no-inline-assembly
        assembly {
            account := sload(slot)
        }
    }

    /// @dev Return the upgrader slot.
    function _isUpgrader(address account) internal view returns (bool enable) {
        bytes32 slot = keccak256(abi.encodePacked(UPGRADER_SLOT_TAG, account));
        // solhint-disable-next-line no-inline-assembly
        assembly {
            enable := sload(slot)
        }
    }

    /// @dev Return the pauser slot.
    function _isPauser(address account) internal view returns (bool enable) {
        bytes32 slot = keccak256(abi.encodePacked(PAUSER_SLOT_TAG, account));
        // solhint-disable-next-line no-inline-assembly
        assembly {
            enable := sload(slot)
        }
    }

    /// @dev Set new owner
    function _setOwner(address account) internal {
        require(account != address(0), "Proxy: account can not be zero");

        bytes32 slot = OWNER_SLOT;
        // solhint-disable-next-line no-inline-assembly
        assembly {
            sstore(slot, account)
        }
    }

    function _setUpgrader(address account, bool enable) internal {
        require(account != address(0), "Proxy: account can not be zero");

        bytes32 slot = keccak256(abi.encodePacked(UPGRADER_SLOT_TAG, account));
        // solhint-disable-next-line no-inline-assembly
        assembly {
            sstore(slot, enable)
        }
    }

    function _setPauser(address account, bool enable) internal {
        require(account != address(0), "Proxy: account can not be zero");

        bytes32 slot = keccak256(abi.encodePacked(PAUSER_SLOT_TAG, account));
        // solhint-disable-next-line no-inline-assembly
        assembly {
            sstore(slot, enable)
        }
    }

    /// @dev Perform implementation upgrade
    function upgradeTo(address _impl) external canUpgrade {
        _upgradeTo(_impl);
    }

    /// @dev Perform implementation upgrade with additional setup call.
    function upgradeToAndCall(address _impl, bytes memory data) external payable canUpgrade {
        _upgradeToAndCall(_impl, data);
    }

    /// @dev Get proxy status.
    function status() external view returns (bool) {
        return _status();
    }

    /// @dev Pause or unpause proxy.
    function setStatus(bool active) external canPause {
        _setStatus(active);
        emit StatusUpdated(active);
    }

    /// @dev Returns the current owner.
    function proxyOwner() external view returns (address) {
        return _owner();
    }

    /// @dev eturns if the current account is upgrader.
    function isUpgrader(address account) external view returns (bool) {
        return _isUpgrader(account);
    }

    /// @dev Returns if the current account is pauser.
    function isPauser(address account) external view returns (bool) {
        return _isPauser(account);
    }

    /// @dev Changes the owner of the proxy.
    function changeOwner(address _newOwner) external onlyOwner {
        address _oldOwner = _owner();
        _setOwner(_newOwner);
        emit OwnerChanged(_oldOwner, _newOwner);
    }

    /// @dev Set upgrader.
    function setUpgrader(address account, bool enable) external onlyOwner {
        _setUpgrader(account, enable);
        emit SetUpgrader(account, enable);
    }

    /// @dev Set pauser.
    function setPauser(address account, bool enable) external onlyOwner {
        _setPauser(account, enable);
        emit SetPauser(account, enable);
    }

    ///////////////////////// ERC897Proxy methods ////////////////////////
    
    /// @dev See in IERC897Proxy.
    function implementation() external view override returns (address) {
        return _implementation();
    }

    /// @dev See in IERC897Proxy.
    function proxyType() external pure override returns (uint256) {
        // upgradable
        return 2;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (proxy/Proxy.sol)

pragma solidity ^0.8.0;

/**
 * @dev This abstract contract provides a fallback function that delegates all calls to another contract using the EVM
 * instruction `delegatecall`. We refer to the second contract as the _implementation_ behind the proxy, and it has to
 * be specified by overriding the virtual {_implementation} function.
 *
 * Additionally, delegation to the implementation can be triggered manually through the {_fallback} function, or to a
 * different contract through the {_delegate} function.
 *
 * The success and return data of the delegated call will be returned back to the caller of the proxy.
 */
abstract contract Proxy {
    /**
     * @dev Delegates the current call to `implementation`.
     *
     * This function does not return to its internal call site, it will return directly to the external caller.
     */
    function _delegate(address implementation) internal virtual {
        assembly {
            // Copy msg.data. We take full control of memory in this inline assembly
            // block because it will not return to Solidity code. We overwrite the
            // Solidity scratch pad at memory position 0.
            calldatacopy(0, 0, calldatasize())

            // Call the implementation.
            // out and outsize are 0 because we don't know the size yet.
            let result := delegatecall(gas(), implementation, 0, calldatasize(), 0, 0)

            // Copy the returned data.
            returndatacopy(0, 0, returndatasize())

            switch result
            // delegatecall returns 0 on error.
            case 0 {
                revert(0, returndatasize())
            }
            default {
                return(0, returndatasize())
            }
        }
    }

    /**
     * @dev This is a virtual function that should be overridden so it returns the address to which the fallback function
     * and {_fallback} should delegate.
     */
    function _implementation() internal view virtual returns (address);

    /**
     * @dev Delegates the current call to the address returned by `_implementation()`.
     *
     * This function does not return to its internal call site, it will return directly to the external caller.
     */
    function _fallback() internal virtual {
        _beforeFallback();
        _delegate(_implementation());
    }

    /**
     * @dev Fallback function that delegates calls to the address returned by `_implementation()`. Will run if no other
     * function in the contract matches the call data.
     */
    fallback() external payable virtual {
        _fallback();
    }

    /**
     * @dev Fallback function that delegates calls to the address returned by `_implementation()`. Will run if call data
     * is empty.
     */
    receive() external payable virtual {
        _fallback();
    }

    /**
     * @dev Hook that is called before falling back to the implementation. Can happen as part of a manual `_fallback`
     * call, or as part of the Solidity `fallback` or `receive` functions.
     *
     * If overridden should call `super._beforeFallback()`.
     */
    function _beforeFallback() internal virtual {}
}

//SPDX-License-Identifier: Unlicense
pragma solidity ^0.8.0;

/// @dev Interface of EIP-897 delegate proxy. 
interface IERC897Proxy {
  /// @dev Checking the proxy type is the way to check whether a contract is a proxy at all.
  function proxyType() external pure returns (uint256 proxyTypeId);

  /// @dev The returned code address is the address the proxy would delegate calls to at that moment in time.
  function implementation() external view returns (address codeAddr);
}

{
  "optimizer": {
    "enabled": true,
    "runs": 10000
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  }
}

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[{"inputs":[{"internalType":"address","name":"_impl","type":"address"},{"internalType":"address","name":"_implOwner","type":"address"},{"internalType":"address","name":"_proxyOwner","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnerChanged","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"account","type":"address"},{"indexed":false,"internalType":"bool","name":"enable","type":"bool"}],"name":"SetPauser","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"account","type":"address"},{"indexed":false,"internalType":"bool","name":"enable","type":"bool"}],"name":"SetUpgrader","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"bool","name":"status","type":"bool"}],"name":"StatusUpdated","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"implementation","type":"address"}],"name":"Upgraded","type":"event"},{"stateMutability":"payable","type":"fallback"},{"inputs":[{"internalType":"address","name":"_newOwner","type":"address"}],"name":"changeOwner","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"implementation","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"account","type":"address"}],"name":"isPauser","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"account","type":"address"}],"name":"isUpgrader","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"proxyOwner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"proxyType","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"pure","type":"function"},{"inputs":[{"internalType":"address","name":"account","type":"address"},{"internalType":"bool","name":"enable","type":"bool"}],"name":"setPauser","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bool","name":"active","type":"bool"}],"name":"setStatus","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"account","type":"address"},{"internalType":"bool","name":"enable","type":"bool"}],"name":"setUpgrader","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"status","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_impl","type":"address"}],"name":"upgradeTo","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_impl","type":"address"},{"internalType":"bytes","name":"data","type":"bytes"}],"name":"upgradeToAndCall","outputs":[],"stateMutability":"payable","type":"function"},{"stateMutability":"payable","type":"receive"}]

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000000000000000000000000557683a5fa469d00516dee63fbf345c450cf647a0000000000000000000000000ec16ef9c827dd2e647557955811c4ef5e4a08f50000000000000000000000000ec16ef9c827dd2e647557955811c4ef5e4a08f5

-----Decoded View---------------
Arg [0] : _impl (address): 0x557683A5Fa469d00516dee63fbf345c450Cf647a
Arg [1] : _implOwner (address): 0x0eC16ef9C827dd2E647557955811c4ef5e4a08f5
Arg [2] : _proxyOwner (address): 0x0eC16ef9C827dd2E647557955811c4ef5e4a08f5

-----Encoded View---------------
3 Constructor Arguments found :
Arg [0] : 000000000000000000000000557683a5fa469d00516dee63fbf345c450cf647a
Arg [1] : 0000000000000000000000000ec16ef9c827dd2e647557955811c4ef5e4a08f5
Arg [2] : 0000000000000000000000000ec16ef9c827dd2e647557955811c4ef5e4a08f5