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// SPDX-License-Identifier: MIT
// Further information: https://eips.ethereum.org/EIPS/eip-1014

pragma solidity ^0.8.9;

import "@openzeppelin/contracts/utils/Create2.sol";
import "@openzeppelin/contracts/utils/introspection/ERC1820Implementer.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/security/Pausable.sol";
import {SphereXProtected} from "@spherex-xyz/contracts/src/SphereXProtected.sol";

interface Proxy {
    function upgradeTo(address) external;

    function initialize() external;

    function initialize(bytes memory) external;
}

contract Create2Deployer is Ownable, Pausable {
    /**
     * @dev Deploys a contract using `CREATE2`. The address where the
     * contract will be deployed can be known in advance via {computeAddress}.
     *
     * The bytecode for a contract can be obtained from Solidity with
     * `type(contractName).creationCode`.
     *
     * Requirements:
     * - `bytecode` must not be empty.
     * - `salt` must have not been used for `bytecode` already.
     * - the factory must have a balance of at least `value`.
     * - if `value` is non-zero, `bytecode` must have a `payable` constructor.
     * - `initializeData` must be a valid data to call `initialize` on the new implementation.
     */
    function deployProxy(
        uint256 value,
        bytes32 salt,
        bytes memory code,
        address newImplementation,
        bytes memory initializeData
    ) public whenNotPaused onlyOwner sphereXGuardPublic(13, 0x115d01c4) {
        address proxy = Create2.deploy(value, salt, code);
        Proxy(proxy).upgradeTo(newImplementation);
        Proxy(proxy).initialize(initializeData);
    }

    /**
     * @dev Deploys a contract using `CREATE2`. The address where the
     * contract will be deployed can be known in advance via {computeAddress}.
     *
     * The bytecode for a contract can be obtained from Solidity with
     * `type(contractName).creationCode`.
     *
     * Requirements:
     * - `bytecode` must not be empty.
     * - `salt` must have not been used for `bytecode` already.
     * - the factory must have a balance of at least `value`.
     * - if `value` is non-zero, `bytecode` must have a `payable` constructor.
     */
    function deploy(
        uint256 value,
        bytes32 salt,
        bytes memory code
    ) public whenNotPaused onlyOwner sphereXGuardPublic(11, 0x66cfa057) {
        Create2.deploy(value, salt, code);
    }

    /**
     * @dev Deployment of the {ERC1820Implementer}.
     * Further information: https://eips.ethereum.org/EIPS/eip-1820
     */
    function deployERC1820Implementer(
        uint256 value,
        bytes32 salt
    ) public whenNotPaused onlyOwner sphereXGuardPublic(12, 0x076c37b2) {
        Create2.deploy(value, salt, type(ERC1820Implementer).creationCode);
    }

    /**
     * @dev Returns the address where a contract will be stored if deployed via {deploy}.
     * Any change in the `bytecodeHash` or `salt` will result in a new destination address.
     */
    function computeAddress(bytes32 salt, bytes32 codeHash) public view returns (address) {
        return Create2.computeAddress(salt, codeHash);
    }

    /**
     * @dev Returns the address where a contract will be stored if deployed via {deploy} from a
     * contract located at `deployer`. If `deployer` is this contract's address, returns the
     * same value as {computeAddress}.
     */
    function computeAddressWithDeployer(
        bytes32 salt,
        bytes32 codeHash,
        address deployer
    ) public pure returns (address) {
        return Create2.computeAddress(salt, codeHash, deployer);
    }

    /**
     * @dev Contract can receive ether. However, the only way to transfer this ether is
     * to call the function `killCreate2Deployer`.
     */
    receive() external payable {}

    /**
     * @dev Triggers stopped state.
     * Requirements: The contract must not be paused.
     */
    function pause() public onlyOwner sphereXGuardPublic(15, 0x8456cb59) {
        _pause();
    }

    /**
     * @dev Returns to normal state.
     * Requirements: The contract must be paused.
     */
    function unpause() public onlyOwner sphereXGuardPublic(16, 0x3f4ba83a) {
        _unpause();
    }

    /**
     * @dev Destroys the Create2Deployer contract and transfers all ether to a pre-defined payout address.
     * @notice Using the `CREATE2` EVM opcode always allows to redeploy a new smart contract to a
     * previously seldestructed contract address. However, if a contract creation is attempted,
     * due to either a creation transaction or the `CREATE`/`CREATE2` EVM opcode, and the destination
     * address already has either nonzero nonce, or non-empty code, then the creation throws immediately,
     * with exactly the same behavior as would arise if the first byte in the init code were an invalid opcode.
     * This applies retroactively starting from genesis.
     */
    function killCreate2Deployer(address payable payoutAddress) public onlyOwner sphereXGuardPublic(14, 0x64470454) {
        payoutAddress.transfer(address(this).balance);
        selfdestruct(payoutAddress);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (access/Ownable.sol)

pragma solidity ^0.8.0;

import "../utils/Context.sol";
import {SphereXProtected} from "@spherex-xyz/contracts/src/SphereXProtected.sol";

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context, SphereXProtected {
    address private _owner;

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

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor() {
        _transferOwnership(_msgSender());
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        _checkOwner();
        _;
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal view virtual {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner sphereXGuardPublic(18, 0x715018a6) {
        _transferOwnership(address(0));
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner sphereXGuardPublic(19, 0xf2fde38b) {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual sphereXGuardInternal(17) {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (security/Pausable.sol)

pragma solidity ^0.8.0;

import "../utils/Context.sol";
import {SphereXProtected} from "@spherex-xyz/contracts/src/SphereXProtected.sol";

/**
 * @dev Contract module which allows children to implement an emergency stop
 * mechanism that can be triggered by an authorized account.
 *
 * This module is used through inheritance. It will make available the
 * modifiers `whenNotPaused` and `whenPaused`, which can be applied to
 * the functions of your contract. Note that they will not be pausable by
 * simply including this module, only once the modifiers are put in place.
 */
abstract contract Pausable is Context, SphereXProtected {
    /**
     * @dev Emitted when the pause is triggered by `account`.
     */
    event Paused(address account);

    /**
     * @dev Emitted when the pause is lifted by `account`.
     */
    event Unpaused(address account);

    bool private _paused;

    /**
     * @dev Initializes the contract in unpaused state.
     */
    constructor() {
        _paused = false;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is not paused.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    modifier whenNotPaused() {
        _requireNotPaused();
        _;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is paused.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    modifier whenPaused() {
        _requirePaused();
        _;
    }

    /**
     * @dev Returns true if the contract is paused, and false otherwise.
     */
    function paused() public view virtual returns (bool) {
        return _paused;
    }

    /**
     * @dev Throws if the contract is paused.
     */
    function _requireNotPaused() internal view virtual {
        require(!paused(), "Pausable: paused");
    }

    /**
     * @dev Throws if the contract is not paused.
     */
    function _requirePaused() internal view virtual {
        require(paused(), "Pausable: not paused");
    }

    /**
     * @dev Triggers stopped state.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    function _pause() internal virtual whenNotPaused sphereXGuardInternal(20) {
        _paused = true;
        emit Paused(_msgSender());
    }

    /**
     * @dev Returns to normal state.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    function _unpause() internal virtual whenPaused sphereXGuardInternal(21) {
        _paused = false;
        emit Unpaused(_msgSender());
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)

pragma solidity ^0.8.0;

/**
 * @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 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) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (utils/Create2.sol)

pragma solidity ^0.8.0;

/**
 * @dev Helper to make usage of the `CREATE2` EVM opcode easier and safer.
 * `CREATE2` can be used to compute in advance the address where a smart
 * contract will be deployed, which allows for interesting new mechanisms known
 * as 'counterfactual interactions'.
 *
 * See the https://eips.ethereum.org/EIPS/eip-1014#motivation[EIP] for more
 * information.
 */
library Create2 {
    /**
     * @dev Deploys a contract using `CREATE2`. The address where the contract
     * will be deployed can be known in advance via {computeAddress}.
     *
     * The bytecode for a contract can be obtained from Solidity with
     * `type(contractName).creationCode`.
     *
     * Requirements:
     *
     * - `bytecode` must not be empty.
     * - `salt` must have not been used for `bytecode` already.
     * - the factory must have a balance of at least `amount`.
     * - if `amount` is non-zero, `bytecode` must have a `payable` constructor.
     */
    function deploy(
        uint256 amount,
        bytes32 salt,
        bytes memory bytecode
    ) internal returns (address addr) {
        require(address(this).balance >= amount, "Create2: insufficient balance");
        require(bytecode.length != 0, "Create2: bytecode length is zero");
        /// @solidity memory-safe-assembly
        assembly {
            addr := create2(amount, add(bytecode, 0x20), mload(bytecode), salt)
        }
        require(addr != address(0), "Create2: Failed on deploy");
    }

    /**
     * @dev Returns the address where a contract will be stored if deployed via {deploy}. Any change in the
     * `bytecodeHash` or `salt` will result in a new destination address.
     */
    function computeAddress(bytes32 salt, bytes32 bytecodeHash) internal view returns (address) {
        return computeAddress(salt, bytecodeHash, address(this));
    }

    /**
     * @dev Returns the address where a contract will be stored if deployed via {deploy} from a contract located at
     * `deployer`. If `deployer` is this contract's address, returns the same value as {computeAddress}.
     */
    function computeAddress(
        bytes32 salt,
        bytes32 bytecodeHash,
        address deployer
    ) internal pure returns (address addr) {
        /// @solidity memory-safe-assembly
        assembly {
            let ptr := mload(0x40) // Get free memory pointer

            // |                   | ↓ ptr ...  ↓ ptr + 0x0B (start) ...  ↓ ptr + 0x20 ...  ↓ ptr + 0x40 ...   |
            // |-------------------|---------------------------------------------------------------------------|
            // | bytecodeHash      |                                                        CCCCCCCCCCCCC...CC |
            // | salt              |                                      BBBBBBBBBBBBB...BB                   |
            // | deployer          | 000000...0000AAAAAAAAAAAAAAAAAAA...AA                                     |
            // | 0xFF              |            FF                                                             |
            // |-------------------|---------------------------------------------------------------------------|
            // | memory            | 000000...00FFAAAAAAAAAAAAAAAAAAA...AABBBBBBBBBBBBB...BBCCCCCCCCCCCCC...CC |
            // | keccak(start, 85) |            ↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑ |

            mstore(add(ptr, 0x40), bytecodeHash)
            mstore(add(ptr, 0x20), salt)
            mstore(ptr, deployer) // Right-aligned with 12 preceding garbage bytes
            let start := add(ptr, 0x0b) // The hashed data starts at the final garbage byte which we will set to 0xff
            mstore8(start, 0xff)
            addr := keccak256(start, 85)
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/ERC1820Implementer.sol)

pragma solidity ^0.8.0;

import "./IERC1820Implementer.sol";

/**
 * @dev Implementation of the {IERC1820Implementer} interface.
 *
 * Contracts may inherit from this and call {_registerInterfaceForAddress} to
 * declare their willingness to be implementers.
 * {IERC1820Registry-setInterfaceImplementer} should then be called for the
 * registration to be complete.
 */
contract ERC1820Implementer is IERC1820Implementer {
    bytes32 private constant _ERC1820_ACCEPT_MAGIC = keccak256("ERC1820_ACCEPT_MAGIC");

    mapping(bytes32 => mapping(address => bool)) private _supportedInterfaces;

    /**
     * @dev See {IERC1820Implementer-canImplementInterfaceForAddress}.
     */
    function canImplementInterfaceForAddress(bytes32 interfaceHash, address account)
        public
        view
        virtual
        override
        returns (bytes32)
    {
        return _supportedInterfaces[interfaceHash][account] ? _ERC1820_ACCEPT_MAGIC : bytes32(0x00);
    }

    /**
     * @dev Declares the contract as willing to be an implementer of
     * `interfaceHash` for `account`.
     *
     * See {IERC1820Registry-setInterfaceImplementer} and
     * {IERC1820Registry-interfaceHash}.
     */
    function _registerInterfaceForAddress(bytes32 interfaceHash, address account) internal virtual {
        _supportedInterfaces[interfaceHash][account] = true;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/IERC1820Implementer.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface for an ERC1820 implementer, as defined in the
 * https://eips.ethereum.org/EIPS/eip-1820#interface-implementation-erc1820implementerinterface[EIP].
 * Used by contracts that will be registered as implementers in the
 * {IERC1820Registry}.
 */
interface IERC1820Implementer {
    /**
     * @dev Returns a special value (`ERC1820_ACCEPT_MAGIC`) if this contract
     * implements `interfaceHash` for `account`.
     *
     * See {IERC1820Registry-setInterfaceImplementer}.
     */
    function canImplementInterfaceForAddress(bytes32 interfaceHash, address account) external view returns (bytes32);
}

// SPDX-License-Identifier: UNLICENSED
// (c) SphereX 2023 Terms&Conditions

pragma solidity ^0.8.0;

/**
 * @title Interface for SphereXEngine - definitions of core functionality
 * @author SphereX Technologies ltd
 * @notice This interface is imported by SphereXProtected, so that SphereXProtected can call functions from SphereXEngine
 * @dev Full docs of these functions can be found in SphereXEngine
 */

interface ISphereXEngine {
    function sphereXValidatePre(int256 num, address sender, bytes calldata data) external returns (bytes32[] memory);
    function sphereXValidatePost(
        int256 num,
        uint256 gas,
        bytes32[] calldata valuesBefore,
        bytes32[] calldata valuesAfter
    ) external;
    function sphereXValidateInternalPre(int256 num) external returns (bytes32[] memory);
    function sphereXValidateInternalPost(
        int256 num,
        uint256 gas,
        bytes32[] calldata valuesBefore,
        bytes32[] calldata valuesAfter
    ) external;

    function addAllowedSenderOnChain(address sender) external;

    /**
     * This function is taken as is from OZ IERC165, we don't inherit from OZ
     * to avoid collisions with the customer OZ version.
     *
     * @dev Returns true if this contract implements the interface defined by
     * `interfaceId`. See the corresponding
     * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
     * to learn more about how these ids are created.
     *
     * This function call must use less than 30 000 gas.
     */
    function supportsInterface(bytes4 interfaceId) external view returns (bool);
}

/**
 * @dev this struct is used to reduce the stack usage of the modifiers.
 */
struct ModifierLocals {
    bytes32[] storageSlots;
    bytes32[] valuesBefore;
    uint256 gas;
}

// SPDX-License-Identifier: UNLICENSED
// (c) SphereX 2023 Terms&Conditions

pragma solidity ^0.8.0;

import {SphereXProtectedBase} from "./SphereXProtectedBase.sol";

/**
 * @title SphereX base Customer contract template
 * @dev notice this is an abstract
 */
abstract contract SphereXProtected is SphereXProtectedBase(tx.origin, address(0), address(0)) {}

// SPDX-License-Identifier: UNLICENSED
// (c) SphereX 2023 Terms&Conditions

pragma solidity ^0.8.0;

import {ISphereXEngine, ModifierLocals} from "./ISphereXEngine.sol";

/**
 * @title SphereX base Customer contract template
 */
abstract contract SphereXProtectedBase {
    /**
     * @dev we would like to avoid occupying storage slots
     * @dev to easily incorporate with existing contracts
     */
    bytes32 private constant SPHEREX_ADMIN_STORAGE_SLOT = bytes32(uint256(keccak256("eip1967.spherex.spherex")) - 1);
    bytes32 private constant SPHEREX_PENDING_ADMIN_STORAGE_SLOT =
        bytes32(uint256(keccak256("eip1967.spherex.pending")) - 1);
    bytes32 private constant SPHEREX_OPERATOR_STORAGE_SLOT = bytes32(uint256(keccak256("eip1967.spherex.operator")) - 1);
    bytes32 private constant SPHEREX_ENGINE_STORAGE_SLOT =
        bytes32(uint256(keccak256("eip1967.spherex.spherex_engine")) - 1);

    event ChangedSpherexOperator(address oldSphereXAdmin, address newSphereXAdmin);
    event ChangedSpherexEngineAddress(address oldEngineAddress, address newEngineAddress);
    event SpherexAdminTransferStarted(address currentAdmin, address pendingAdmin);
    event SpherexAdminTransferCompleted(address oldAdmin, address newAdmin);

    /**
     * @dev used when the client doesn't use a proxy
     * @notice constructor visibility is required to support all compiler versions
     */
    constructor(address admin, address operator, address engine) {
        __SphereXProtectedBase_init(admin, operator, engine);
    }

    /**
     * @dev used when the client uses a proxy - should be called by the inhereter initialization
     */
    function __SphereXProtectedBase_init(address admin, address operator, address engine) internal virtual {
        _setAddress(SPHEREX_ADMIN_STORAGE_SLOT, admin);
        emit SpherexAdminTransferCompleted(address(0), admin);

        _setAddress(SPHEREX_OPERATOR_STORAGE_SLOT, operator);
        emit ChangedSpherexOperator(address(0), operator);

        _checkSphereXEngine(engine);
        _setAddress(SPHEREX_ENGINE_STORAGE_SLOT, engine);
        emit ChangedSpherexEngineAddress(address(0), engine);
    }

    // ============ Helper functions ============

    function _sphereXEngine() private view returns (ISphereXEngine) {
        return ISphereXEngine(_getAddress(SPHEREX_ENGINE_STORAGE_SLOT));
    }

    /**
     * Stores a new address in an arbitrary slot
     * @param slot where to store the address
     * @param newAddress address to store in given slot
     */
    function _setAddress(bytes32 slot, address newAddress) internal {
        // solhint-disable-next-line no-inline-assembly
        // slither-disable-next-line assembly
        assembly {
            sstore(slot, newAddress)
        }
    }

    /**
     * Returns an address from an arbitrary slot.
     * @param slot to read an address from
     */
    function _getAddress(bytes32 slot) internal view returns (address addr) {
        // solhint-disable-next-line no-inline-assembly
        // slither-disable-next-line assembly
        assembly {
            addr := sload(slot)
        }
    }

    // ============ Local modifiers ============

    modifier onlySphereXAdmin() {
        require(msg.sender == _getAddress(SPHEREX_ADMIN_STORAGE_SLOT), "SphereX error: admin required");
        _;
    }

    modifier spherexOnlyOperator() {
        require(msg.sender == _getAddress(SPHEREX_OPERATOR_STORAGE_SLOT), "SphereX error: operator required");
        _;
    }

    modifier returnsIfNotActivated() {
        if (address(_sphereXEngine()) == address(0)) {
            return;
        }

        _;
    }

    // ============ Management ============

    /**
     * Returns the currently pending admin address, the one that can call acceptSphereXAdminRole to become the admin.
     * @dev Could not use OZ Ownable2Step because the client's contract might use it.
     */
    function pendingSphereXAdmin() public view returns (address) {
        return _getAddress(SPHEREX_PENDING_ADMIN_STORAGE_SLOT);
    }

    /**
     * Returns the current admin address, the one that can call acceptSphereXAdminRole to become the admin.
     * @dev Could not use OZ Ownable2Step because the client's contract might use it.
     */
    function sphereXAdmin() public view returns (address) {
        return _getAddress(SPHEREX_ADMIN_STORAGE_SLOT);
    }

    /**
     * Returns the current operator address.
     */
    function sphereXOperator() public view returns (address) {
        return _getAddress(SPHEREX_OPERATOR_STORAGE_SLOT);
    }

    /**
     * Returns the current engine address.
     */
    function sphereXEngine() public view returns (address) {
        return _getAddress(SPHEREX_ENGINE_STORAGE_SLOT);
    }

    /**
     * Setting the address of the next admin. this address will have to accept the role to become the new admin.
     * @dev Could not use OZ Ownable2Step because the client's contract might use it.
     */
    function transferSphereXAdminRole(address newAdmin) public virtual onlySphereXAdmin {
        _setAddress(SPHEREX_PENDING_ADMIN_STORAGE_SLOT, newAdmin);
        emit SpherexAdminTransferStarted(sphereXAdmin(), newAdmin);
    }

    /**
     * Accepting the admin role and completing the transfer.
     * @dev Could not use OZ Ownable2Step because the client's contract might use it.
     */
    function acceptSphereXAdminRole() public virtual {
        require(pendingSphereXAdmin() == msg.sender, "SphereX error: not the pending account");
        address oldAdmin = sphereXAdmin();
        _setAddress(SPHEREX_ADMIN_STORAGE_SLOT, msg.sender);
        _setAddress(SPHEREX_PENDING_ADMIN_STORAGE_SLOT, address(0));
        emit SpherexAdminTransferCompleted(oldAdmin, msg.sender);
    }

    /**
     *
     * @param newSphereXOperator new address of the new operator account
     */
    function changeSphereXOperator(address newSphereXOperator) external onlySphereXAdmin {
        address oldSphereXOperator = _getAddress(SPHEREX_OPERATOR_STORAGE_SLOT);
        _setAddress(SPHEREX_OPERATOR_STORAGE_SLOT, newSphereXOperator);
        emit ChangedSpherexOperator(oldSphereXOperator, newSphereXOperator);
    }

    /**
     * Checks the given address implements ISphereXEngine or is address(0)
     * @param newSphereXEngine new address of the spherex engine
     */
    function _checkSphereXEngine(address newSphereXEngine) private view {
        require(
            newSphereXEngine == address(0)
                || ISphereXEngine(newSphereXEngine).supportsInterface(type(ISphereXEngine).interfaceId),
            "SphereX error: not a SphereXEngine"
        );
    }

    /**
     *
     * @param newSphereXEngine new address of the spherex engine
     * @dev this is also used to actually enable the defense
     * (because as long is this address is 0, the protection is disabled).
     */
    function changeSphereXEngine(address newSphereXEngine) external spherexOnlyOperator {
        _checkSphereXEngine(newSphereXEngine);
        address oldEngine = _getAddress(SPHEREX_ENGINE_STORAGE_SLOT);
        _setAddress(SPHEREX_ENGINE_STORAGE_SLOT, newSphereXEngine);
        emit ChangedSpherexEngineAddress(oldEngine, newSphereXEngine);
    }
    // ============ Engine interaction ============

    function _addAllowedSenderOnChain(address newSender) internal {
        ISphereXEngine engine = _sphereXEngine();
        if (address(engine) != address(0)) {
            engine.addAllowedSenderOnChain(newSender);
        }
    }

    // ============ Hooks ============

    /**
     * @dev internal function for engine communication. We use it to reduce contract size.
     *  Should be called before the code of a function.
     * @param num function identifier
     * @param isExternalCall set to true if this was called externally
     *  or a 'public' function from another address
     */
    function _sphereXValidatePre(int256 num, bool isExternalCall)
        private
        returnsIfNotActivated
        returns (ModifierLocals memory locals)
    {
        ISphereXEngine sphereXEngine = _sphereXEngine();
        if (isExternalCall) {
            locals.storageSlots = sphereXEngine.sphereXValidatePre(num, msg.sender, msg.data);
        } else {
            locals.storageSlots = sphereXEngine.sphereXValidateInternalPre(num);
        }
        locals.valuesBefore = _readStorage(locals.storageSlots);
        locals.gas = gasleft();
        return locals;
    }

    /**
     * @dev internal function for engine communication. We use it to reduce contract size.
     *  Should be called after the code of a function.
     * @param num function identifier
     * @param isExternalCall set to true if this was called externally
     *  or a 'public' function from another address
     */
    function _sphereXValidatePost(int256 num, bool isExternalCall, ModifierLocals memory locals)
        private
        returnsIfNotActivated
    {
        uint256 gas = locals.gas - gasleft();

        ISphereXEngine sphereXEngine = _sphereXEngine();

        bytes32[] memory valuesAfter;
        valuesAfter = _readStorage(locals.storageSlots);

        if (isExternalCall) {
            sphereXEngine.sphereXValidatePost(num, gas, locals.valuesBefore, valuesAfter);
        } else {
            sphereXEngine.sphereXValidateInternalPost(num, gas, locals.valuesBefore, valuesAfter);
        }
    }

    /**
     * @dev internal function for engine communication. We use it to reduce contract size.
     *  Should be called before the code of a function.
     * @param num function identifier
     * @return locals ModifierLocals
     */
    function _sphereXValidateInternalPre(int256 num)
        internal
        returnsIfNotActivated
        returns (ModifierLocals memory locals)
    {
        locals.storageSlots = _sphereXEngine().sphereXValidateInternalPre(num);
        locals.valuesBefore = _readStorage(locals.storageSlots);
        locals.gas = gasleft();
        return locals;
    }

    /**
     * @dev internal function for engine communication. We use it to reduce contract size.
     *  Should be called after the code of a function.
     * @param num function identifier
     * @param locals ModifierLocals
     */
    function _sphereXValidateInternalPost(int256 num, ModifierLocals memory locals) internal returnsIfNotActivated {
        bytes32[] memory valuesAfter;
        valuesAfter = _readStorage(locals.storageSlots);
        _sphereXEngine().sphereXValidateInternalPost(num, locals.gas - gasleft(), locals.valuesBefore, valuesAfter);
    }

    /**
     *  @dev Modifier to be incorporated in all internal protected non-view functions
     */
    modifier sphereXGuardInternal(int256 num) {
        ModifierLocals memory locals = _sphereXValidateInternalPre(num);
        _;
        _sphereXValidateInternalPost(-num, locals);
    }

    /**
     *  @dev Modifier to be incorporated in all external protected non-view functions
     */
    modifier sphereXGuardExternal(int256 num) {
        ModifierLocals memory locals = _sphereXValidatePre(num, true);
        _;
        _sphereXValidatePost(-num, true, locals);
    }

    /**
     *  @dev Modifier to be incorporated in all public protected non-view functions
     */
    modifier sphereXGuardPublic(int256 num, bytes4 selector) {
        ModifierLocals memory locals = _sphereXValidatePre(num, msg.sig == selector);
        _;
        _sphereXValidatePost(-num, msg.sig == selector, locals);
    }

    // ============ Internal Storage logic ============

    /**
     * Internal function that reads values from given storage slots and returns them
     * @param storageSlots list of storage slots to read
     * @return list of values read from the various storage slots
     */
    function _readStorage(bytes32[] memory storageSlots) internal view returns (bytes32[] memory) {
        uint256 arrayLength = storageSlots.length;
        bytes32[] memory values = new bytes32[](arrayLength);
        // create the return array data

        for (uint256 i = 0; i < arrayLength; i++) {
            bytes32 slot = storageSlots[i];
            bytes32 temp_value;
            // solhint-disable-next-line no-inline-assembly
            // slither-disable-next-line assembly
            assembly {
                temp_value := sload(slot)
            }

            values[i] = temp_value;
        }
        return values;
    }
}

{
  "viaIR": true,
  "optimizer": {
    "enabled": true,
    "runs": 1,
    "details": {
      "peephole": true,
      "yulDetails": {
        "stackAllocation": true,
        "optimizerSteps": "dhfoD[xarrscLMcCTU]uljmul"
      }
    }
  },
  "evmVersion": "paris",
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

• No Contract Security Audit Submitted- Submit Audit Here

[{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"oldEngineAddress","type":"address"},{"indexed":false,"internalType":"address","name":"newEngineAddress","type":"address"}],"name":"ChangedSpherexEngineAddress","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"oldSphereXAdmin","type":"address"},{"indexed":false,"internalType":"address","name":"newSphereXAdmin","type":"address"}],"name":"ChangedSpherexOperator","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"account","type":"address"}],"name":"Paused","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"oldAdmin","type":"address"},{"indexed":false,"internalType":"address","name":"newAdmin","type":"address"}],"name":"SpherexAdminTransferCompleted","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"currentAdmin","type":"address"},{"indexed":false,"internalType":"address","name":"pendingAdmin","type":"address"}],"name":"SpherexAdminTransferStarted","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"account","type":"address"}],"name":"Unpaused","type":"event"},{"inputs":[],"name":"acceptSphereXAdminRole","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newSphereXEngine","type":"address"}],"name":"changeSphereXEngine","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newSphereXOperator","type":"address"}],"name":"changeSphereXOperator","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes32","name":"salt","type":"bytes32"},{"internalType":"bytes32","name":"codeHash","type":"bytes32"}],"name":"computeAddress","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes32","name":"salt","type":"bytes32"},{"internalType":"bytes32","name":"codeHash","type":"bytes32"},{"internalType":"address","name":"deployer","type":"address"}],"name":"computeAddressWithDeployer","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"pure","type":"function"},{"inputs":[{"internalType":"uint256","name":"value","type":"uint256"},{"internalType":"bytes32","name":"salt","type":"bytes32"},{"internalType":"bytes","name":"code","type":"bytes"}],"name":"deploy","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"value","type":"uint256"},{"internalType":"bytes32","name":"salt","type":"bytes32"}],"name":"deployERC1820Implementer","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"value","type":"uint256"},{"internalType":"bytes32","name":"salt","type":"bytes32"},{"internalType":"bytes","name":"code","type":"bytes"},{"internalType":"address","name":"newImplementation","type":"address"},{"internalType":"bytes","name":"initializeData","type":"bytes"}],"name":"deployProxy","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address payable","name":"payoutAddress","type":"address"}],"name":"killCreate2Deployer","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"pause","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"paused","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"pendingSphereXAdmin","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"sphereXAdmin","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"sphereXEngine","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"sphereXOperator","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newAdmin","type":"address"}],"name":"transferSphereXAdminRole","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"unpause","outputs":[],"stateMutability":"nonpayable","type":"function"},{"stateMutability":"payable","type":"receive"}]

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