Contract Address Details

// File: @openzeppelin/contracts/utils/Context.sol

// 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;
    }
}

// File: @openzeppelin/contracts/security/Pausable.sol

// OpenZeppelin Contracts v4.4.1 (security/Pausable.sol)

pragma solidity ^0.8.0;

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

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

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

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

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

// File: @openzeppelin/contracts/access/Ownable.sol

// OpenZeppelin Contracts v4.4.1 (access/Ownable.sol)

pragma solidity ^0.8.0;

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

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        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 {
        _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 {
        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 {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

// File: @openzeppelin/contracts/utils/introspection/IERC1820Implementer.sol

// 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);
}

// File: @openzeppelin/contracts/utils/introspection/ERC1820Implementer.sol

// OpenZeppelin Contracts v4.4.1 (utils/introspection/ERC1820Implementer.sol)

pragma solidity ^0.8.0;

/**
 * @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;
    }
}

// File: @openzeppelin/contracts/utils/Create2.sol

// OpenZeppelin Contracts v4.4.1 (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) {
        address addr;
        require(address(this).balance >= amount, "Create2: insufficient balance");
        require(bytecode.length != 0, "Create2: bytecode length is zero");
        assembly {
            addr := create2(amount, add(bytecode, 0x20), mload(bytecode), salt)
        }
        require(addr != address(0), "Create2: Failed on deploy");
        return addr;
    }

    /**
     * @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) {
        bytes32 _data = keccak256(abi.encodePacked(bytes1(0xff), deployer, salt, bytecodeHash));
        return address(uint160(uint256(_data)));
    }
}

// File: contracts/Create2Deployer.sol

// Further information: https://eips.ethereum.org/EIPS/eip-1014

pragma solidity ^0.8.9;

/**
 * @title CREATE2 Deployer Smart Contract
 * @author Pascal Marco Caversaccio, [email protected]
 * @dev Helper smart contract to make easier and safer usage of the
 * `CREATE2` EVM opcode. `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'.
 */

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.
     */
    function deploy(
        uint256 value,
        bytes32 salt,
        bytes memory code
    ) public whenNotPaused {
        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 {
        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 {
        _pause();
    }

    /**
     * @dev Returns to normal state.
     * Requirements: The contract must be paused.
     */
    function unpause() public onlyOwner {
        _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 {
        payoutAddress.transfer(address(this).balance);
        selfdestruct(payoutAddress);
    }
}