Contract

//SPDX-License-Identifier: MIT
pragma solidity =0.8.19;

import { BaseFreezeVoting, IBaseFreezeVoting } from "./BaseFreezeVoting.sol";
import { ISafe } from "./interfaces/ISafe.sol";

/**
 * A BaseFreezeVoting implementation which handles freezes on multi-sig (Safe) based DAOs.
 */
contract MultisigFreezeVoting is BaseFreezeVoting {
    ISafe public parentGnosisSafe;

    event MultisigFreezeVotingSetup(
        address indexed owner,
        address indexed parentGnosisSafe
    );

    error NotOwner();
    error AlreadyVoted();

    /**
     * Initialize function, will be triggered when a new instance is deployed.
     *
     * @param initializeParams encoded initialization parameters: `address _owner`,
     * `uint256 _freezeVotesThreshold`, `uint256 _freezeProposalPeriod`, `uint256 _freezePeriod`,
     * `address _parentGnosisSafe`
     */
    function setUp(bytes memory initializeParams) public override initializer {
        (
            address _owner,
            uint256 _freezeVotesThreshold,
            uint32 _freezeProposalPeriod,
            uint32 _freezePeriod,
            address _parentGnosisSafe
        ) = abi.decode(
                initializeParams,
                (address, uint256, uint32, uint32, address)
            );

        __Ownable_init();
        _transferOwnership(_owner);
        _updateFreezeVotesThreshold(_freezeVotesThreshold);
        _updateFreezeProposalPeriod(_freezeProposalPeriod);
        _updateFreezePeriod(_freezePeriod);
        parentGnosisSafe = ISafe(_parentGnosisSafe);

        emit MultisigFreezeVotingSetup(_owner, _parentGnosisSafe);
    }

    /** @inheritdoc IBaseFreezeVoting*/
    function castFreezeVote() external override {
        if (!parentGnosisSafe.isOwner(msg.sender)) revert NotOwner();

        if (block.number > freezeProposalCreatedBlock + freezeProposalPeriod) {
            // create a new freeze proposal and count the caller's vote

            freezeProposalCreatedBlock = uint32(block.number);

            freezeProposalVoteCount = 1;

            emit FreezeProposalCreated(msg.sender);
        } else {
            // there is an existing freeze proposal, count the caller's vote

            if (userHasFreezeVoted[msg.sender][freezeProposalCreatedBlock])
                revert AlreadyVoted();

            freezeProposalVoteCount++;
        }

        userHasFreezeVoted[msg.sender][freezeProposalCreatedBlock] = true;

        emit FreezeVoteCast(msg.sender, 1);
    }
}

//SPDX-License-Identifier: MIT
pragma solidity =0.8.19;

import { FactoryFriendly } from "@gnosis.pm/zodiac/contracts/factory/FactoryFriendly.sol";
import { IBaseFreezeVoting } from "./interfaces/IBaseFreezeVoting.sol";

/**
 * The base abstract contract which holds the state of a vote to freeze a childDAO.
 *
 * The freeze feature gives a way for parentDAOs to have a limited measure of control
 * over their created subDAOs.
 *
 * Normally a subDAO operates independently, and can vote on or sign transactions, 
 * however should the parent disagree with a decision made by the subDAO, any parent
 * token holder can initiate a vote to "freeze" it, making executing transactions impossible
 * for the time denoted by `freezePeriod`.
 *
 * This requires a number of votes equal to `freezeVotesThreshold`, within the `freezeProposalPeriod`
 * to be successful.
 *
 * Following a successful freeze vote, the childDAO will be unable to execute transactions, due to
 * a Safe Transaction Guard, until the `freezePeriod` has elapsed.
 */
abstract contract BaseFreezeVoting is FactoryFriendly, IBaseFreezeVoting {

    /** Block number the freeze proposal was created at. */
    uint32 public freezeProposalCreatedBlock;

    /** Number of blocks a freeze proposal has to succeed. */
    uint32 public freezeProposalPeriod;

    /** Number of blocks a freeze lasts, from time of freeze proposal creation. */
    uint32 public freezePeriod;

    /** Number of freeze votes required to activate a freeze. */
    uint256 public freezeVotesThreshold;

    /** Number of accrued freeze votes. */
    uint256 public freezeProposalVoteCount;

    /**
    * Mapping of address to the block the freeze vote was started to 
    * whether the address has voted yet on the freeze proposal.
    */
    mapping(address => mapping(uint256 => bool)) public userHasFreezeVoted;

    event FreezeVoteCast(address indexed voter, uint256 votesCast);
    event FreezeProposalCreated(address indexed creator);
    event FreezeVotesThresholdUpdated(uint256 freezeVotesThreshold);
    event FreezePeriodUpdated(uint32 freezePeriod);
    event FreezeProposalPeriodUpdated(uint32 freezeProposalPeriod);

    constructor() {
      _disableInitializers();
    }

    /**
     * Casts a positive vote to freeze the subDAO. This function is intended to be called
     * by the individual token holders themselves directly, and will allot their token
     * holdings a "yes" votes towards freezing.
     *
     * Additionally, if a vote to freeze is not already running, calling this will initiate
     * a new vote to freeze it.
     */
    function castFreezeVote() external virtual;

    /**
     * Returns true if the DAO is currently frozen, false otherwise.
     * 
     * @return bool whether the DAO is currently frozen
     */
    function isFrozen() external view returns (bool) {
        return freezeProposalVoteCount >= freezeVotesThreshold 
            && block.number < freezeProposalCreatedBlock + freezePeriod;
    }

    /**
     * Unfreezes the DAO, only callable by the owner (parentDAO).
     */
    function unfreeze() external onlyOwner {
        freezeProposalCreatedBlock = 0;
        freezeProposalVoteCount = 0;
    }

    /**
     * Updates the freeze votes threshold, the number of votes required to enact a freeze.
     *
     * @param _freezeVotesThreshold number of freeze votes required to activate a freeze
     */
    function updateFreezeVotesThreshold(uint256 _freezeVotesThreshold) external onlyOwner {
        _updateFreezeVotesThreshold(_freezeVotesThreshold);
    }

    /**
     * Updates the freeze proposal period, the time that parent token holders have to cast votes
     * after a freeze vote has been initiated.
     *
     * @param _freezeProposalPeriod number of blocks a freeze vote has to succeed to enact a freeze
     */
    function updateFreezeProposalPeriod(uint32 _freezeProposalPeriod) external onlyOwner {
        _updateFreezeProposalPeriod(_freezeProposalPeriod);
    }

    /**
     * Updates the freeze period, the time the DAO will be unable to execute transactions for,
     * should a freeze vote pass.
     *
     * @param _freezePeriod number of blocks a freeze lasts, from time of freeze proposal creation
     */
    function updateFreezePeriod(uint32 _freezePeriod) external onlyOwner {
        _updateFreezePeriod(_freezePeriod);
    }

    /** Internal implementation of `updateFreezeVotesThreshold`. */
    function _updateFreezeVotesThreshold(uint256 _freezeVotesThreshold) internal {
        freezeVotesThreshold = _freezeVotesThreshold;
        emit FreezeVotesThresholdUpdated(_freezeVotesThreshold);
    }

    /** Internal implementation of `updateFreezeProposalPeriod`. */
    function _updateFreezeProposalPeriod(uint32 _freezeProposalPeriod) internal {
        freezeProposalPeriod = _freezeProposalPeriod;
        emit FreezeProposalPeriodUpdated(_freezeProposalPeriod);
    }

    /** Internal implementation of `updateFreezePeriod`. */
    function _updateFreezePeriod(uint32 _freezePeriod) internal {
        freezePeriod = _freezePeriod;
        emit FreezePeriodUpdated(_freezePeriod);
    }
}

//SPDX-License-Identifier: MIT
pragma solidity =0.8.19;

import { Enum } from "@gnosis.pm/safe-contracts/contracts/common/Enum.sol";

/**
 * The specification of methods available on a Safe contract wallet.
 * 
 * This interface does not encompass every available function on a Safe,
 * only those which are used within the Azorius contracts.
 *
 * For the complete set of functions available on a Safe, see:
 * https://github.com/safe-global/safe-contracts/blob/main/contracts/Safe.sol
 */
interface ISafe {

    /**
     * Returns the current transaction nonce of the Safe.
     * Each transaction should has a different nonce to prevent replay attacks.
     *
     * @return uint256 current transaction nonce
     */
    function nonce() external view returns (uint256);

    /**
     * Set a guard contract that checks transactions before execution.
     * This can only be done via a Safe transaction.
     *
     * See https://docs.gnosis-safe.io/learn/safe-tools/guards.
     * See https://github.com/safe-global/safe-contracts/blob/main/contracts/base/GuardManager.sol.
     * 
     * @param _guard address of the guard to be used or the 0 address to disable a guard
     */
    function setGuard(address _guard) external;

    /**
     * Executes an arbitrary transaction on the Safe.
     *
     * @param _to destination address
     * @param _value ETH value
     * @param _data data payload
     * @param _operation Operation type, Call or DelegateCall
     * @param _safeTxGas gas that should be used for the safe transaction
     * @param _baseGas gas costs that are independent of the transaction execution
     * @param _gasPrice max gas price that should be used for this transaction
     * @param _gasToken token address (or 0 if ETH) that is used for the payment
     * @param _refundReceiver address of the receiver of gas payment (or 0 if tx.origin)
     * @param _signatures packed signature data
     * @return success bool whether the transaction was successful or not
     */
    function execTransaction(
        address _to,
        uint256 _value,
        bytes calldata _data,
        Enum.Operation _operation,
        uint256 _safeTxGas,
        uint256 _baseGas,
        uint256 _gasPrice,
        address _gasToken,
        address payable _refundReceiver,
        bytes memory _signatures
    ) external payable returns (bool success);

    /**
     * Checks whether the signature provided is valid for the provided data and hash. Reverts otherwise.
     *
     * @param _dataHash Hash of the data (could be either a message hash or transaction hash)
     * @param _data That should be signed (this is passed to an external validator contract)
     * @param _signatures Signature data that should be verified. Can be packed ECDSA signature 
     *      ({bytes32 r}{bytes32 s}{uint8 v}), contract signature (EIP-1271) or approved hash.
     */
    function checkSignatures(bytes32 _dataHash, bytes memory _data, bytes memory _signatures) external view;

    /**
     * Returns the pre-image of the transaction hash.
     *
     * @param _to destination address
     * @param _value ETH value
     * @param _data data payload
     * @param _operation Operation type, Call or DelegateCall
     * @param _safeTxGas gas that should be used for the safe transaction
     * @param _baseGas gas costs that are independent of the transaction execution
     * @param _gasPrice max gas price that should be used for this transaction
     * @param _gasToken token address (or 0 if ETH) that is used for the payment
     * @param _refundReceiver address of the receiver of gas payment (or 0 if tx.origin)
     * @param _nonce transaction nonce
     * @return bytes hash bytes
     */
    function encodeTransactionData(
        address _to,
        uint256 _value,
        bytes calldata _data,
        Enum.Operation _operation,
        uint256 _safeTxGas,
        uint256 _baseGas,
        uint256 _gasPrice,
        address _gasToken,
        address _refundReceiver,
        uint256 _nonce
    ) external view returns (bytes memory);

    /**
     * Returns if the given address is an owner of the Safe.
     *
     * See https://github.com/safe-global/safe-contracts/blob/main/contracts/base/OwnerManager.sol.
     *
     * @param _owner the address to check
     * @return bool whether _owner is an owner of the Safe
     */
    function isOwner(address _owner) external view returns (bool);
}

// SPDX-License-Identifier: LGPL-3.0-only

/// @title Zodiac FactoryFriendly - A contract that allows other contracts to be initializable and pass bytes as arguments to define contract state
pragma solidity >=0.7.0 <0.9.0;

import "@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol";

abstract contract FactoryFriendly is OwnableUpgradeable {
    function setUp(bytes memory initializeParams) public virtual;
}

//SPDX-License-Identifier: MIT
pragma solidity =0.8.19;

import { Enum } from "@gnosis.pm/safe-contracts/contracts/common/Enum.sol";

/**
 * A specification for a contract which manages the ability to call for and cast a vote
 * to freeze a subDAO.
 *
 * The participants of this vote are parent token holders or signers. The DAO should be
 * able to operate as normal throughout the freeze voting process, however if the vote
 * passes, further transaction executions on the subDAO should be blocked via a Safe guard
 * module (see [MultisigFreezeGuard](../MultisigFreezeGuard.md) / [AzoriusFreezeGuard](../AzoriusFreezeGuard.md)).
 */
interface IBaseFreezeVoting {

    /**
     * Allows an address to cast a "freeze vote", which is a vote to freeze the DAO
     * from executing transactions, even if they've already passed via a Proposal.
     *
     * If a vote to freeze has not already been initiated, a call to this function will do
     * so.
     *
     * This function should be publicly callable by any DAO token holder or signer.
     */
    function castFreezeVote() external;

    /**
     * Unfreezes the DAO.
     */
    function unfreeze() external;

    /**
     * Updates the freeze votes threshold for future freeze votes. This is the number of token
     * votes necessary to begin a freeze on the subDAO.
     *
     * @param _freezeVotesThreshold number of freeze votes required to activate a freeze
     */
    function updateFreezeVotesThreshold(uint256 _freezeVotesThreshold) external;

    /**
     * Updates the freeze proposal period for future freeze votes. This is the length of time
     * (in blocks) that a freeze vote is conducted for.
     *
     * @param _freezeProposalPeriod number of blocks a freeze proposal has to succeed
     */
    function updateFreezeProposalPeriod(uint32 _freezeProposalPeriod) external;

    /**
     * Updates the freeze period. This is the length of time (in blocks) the subDAO is actually
     * frozen for if a freeze vote passes.
     *
     * This period can be overridden by a call to `unfreeze()`, which would require a passed Proposal
     * from the parentDAO.
     *
     * @param _freezePeriod number of blocks a freeze lasts, from time of freeze proposal creation
     */
    function updateFreezePeriod(uint32 _freezePeriod) external;

    /**
     * Returns true if the DAO is currently frozen, false otherwise.
     *
     * @return bool whether the DAO is currently frozen
     */
    function isFrozen() external view returns (bool);
}

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

pragma solidity ^0.8.0;

import "../utils/ContextUpgradeable.sol";
import "../proxy/utils/Initializable.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 OwnableUpgradeable is Initializable, ContextUpgradeable {
    address private _owner;

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

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    function __Ownable_init() internal onlyInitializing {
        __Ownable_init_unchained();
    }

    function __Ownable_init_unchained() internal onlyInitializing {
        _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 {
        _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);
    }

    /**
     * @dev This empty reserved space is put in place to allow future versions to add new
     * variables without shifting down storage in the inheritance chain.
     * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
     */
    uint256[49] private __gap;
}

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

pragma solidity ^0.8.0;
import "../proxy/utils/Initializable.sol";

/**
 * @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 ContextUpgradeable is Initializable {
    function __Context_init() internal onlyInitializing {
    }

    function __Context_init_unchained() internal onlyInitializing {
    }
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

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

    /**
     * @dev This empty reserved space is put in place to allow future versions to add new
     * variables without shifting down storage in the inheritance chain.
     * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
     */
    uint256[50] private __gap;
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (proxy/utils/Initializable.sol)

pragma solidity ^0.8.2;

import "../../utils/AddressUpgradeable.sol";

/**
 * @dev This is a base contract to aid in writing upgradeable contracts, or any kind of contract that will be deployed
 * behind a proxy. Since proxied contracts do not make use of a constructor, it's common to move constructor logic to an
 * external initializer function, usually called `initialize`. It then becomes necessary to protect this initializer
 * function so it can only be called once. The {initializer} modifier provided by this contract will have this effect.
 *
 * The initialization functions use a version number. Once a version number is used, it is consumed and cannot be
 * reused. This mechanism prevents re-execution of each "step" but allows the creation of new initialization steps in
 * case an upgrade adds a module that needs to be initialized.
 *
 * For example:
 *
 * [.hljs-theme-light.nopadding]
 * ```
 * contract MyToken is ERC20Upgradeable {
 *     function initialize() initializer public {
 *         __ERC20_init("MyToken", "MTK");
 *     }
 * }
 * contract MyTokenV2 is MyToken, ERC20PermitUpgradeable {
 *     function initializeV2() reinitializer(2) public {
 *         __ERC20Permit_init("MyToken");
 *     }
 * }
 * ```
 *
 * TIP: To avoid leaving the proxy in an uninitialized state, the initializer function should be called as early as
 * possible by providing the encoded function call as the `_data` argument to {ERC1967Proxy-constructor}.
 *
 * CAUTION: When used with inheritance, manual care must be taken to not invoke a parent initializer twice, or to ensure
 * that all initializers are idempotent. This is not verified automatically as constructors are by Solidity.
 *
 * [CAUTION]
 * ====
 * Avoid leaving a contract uninitialized.
 *
 * An uninitialized contract can be taken over by an attacker. This applies to both a proxy and its implementation
 * contract, which may impact the proxy. To prevent the implementation contract from being used, you should invoke
 * the {_disableInitializers} function in the constructor to automatically lock it when it is deployed:
 *
 * [.hljs-theme-light.nopadding]
 * ```
 * /// @custom:oz-upgrades-unsafe-allow constructor
 * constructor() {
 *     _disableInitializers();
 * }
 * ```
 * ====
 */
abstract contract Initializable {
    /**
     * @dev Indicates that the contract has been initialized.
     * @custom:oz-retyped-from bool
     */
    uint8 private _initialized;

    /**
     * @dev Indicates that the contract is in the process of being initialized.
     */
    bool private _initializing;

    /**
     * @dev Triggered when the contract has been initialized or reinitialized.
     */
    event Initialized(uint8 version);

    /**
     * @dev A modifier that defines a protected initializer function that can be invoked at most once. In its scope,
     * `onlyInitializing` functions can be used to initialize parent contracts. Equivalent to `reinitializer(1)`.
     */
    modifier initializer() {
        bool isTopLevelCall = !_initializing;
        require(
            (isTopLevelCall && _initialized < 1) || (!AddressUpgradeable.isContract(address(this)) && _initialized == 1),
            "Initializable: contract is already initialized"
        );
        _initialized = 1;
        if (isTopLevelCall) {
            _initializing = true;
        }
        _;
        if (isTopLevelCall) {
            _initializing = false;
            emit Initialized(1);
        }
    }

    /**
     * @dev A modifier that defines a protected reinitializer function that can be invoked at most once, and only if the
     * contract hasn't been initialized to a greater version before. In its scope, `onlyInitializing` functions can be
     * used to initialize parent contracts.
     *
     * `initializer` is equivalent to `reinitializer(1)`, so a reinitializer may be used after the original
     * initialization step. This is essential to configure modules that are added through upgrades and that require
     * initialization.
     *
     * Note that versions can jump in increments greater than 1; this implies that if multiple reinitializers coexist in
     * a contract, executing them in the right order is up to the developer or operator.
     */
    modifier reinitializer(uint8 version) {
        require(!_initializing && _initialized < version, "Initializable: contract is already initialized");
        _initialized = version;
        _initializing = true;
        _;
        _initializing = false;
        emit Initialized(version);
    }

    /**
     * @dev Modifier to protect an initialization function so that it can only be invoked by functions with the
     * {initializer} and {reinitializer} modifiers, directly or indirectly.
     */
    modifier onlyInitializing() {
        require(_initializing, "Initializable: contract is not initializing");
        _;
    }

    /**
     * @dev Locks the contract, preventing any future reinitialization. This cannot be part of an initializer call.
     * Calling this in the constructor of a contract will prevent that contract from being initialized or reinitialized
     * to any version. It is recommended to use this to lock implementation contracts that are designed to be called
     * through proxies.
     */
    function _disableInitializers() internal virtual {
        require(!_initializing, "Initializable: contract is initializing");
        if (_initialized < type(uint8).max) {
            _initialized = type(uint8).max;
            emit Initialized(type(uint8).max);
        }
    }
}

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

pragma solidity ^0.8.1;

/**
 * @dev Collection of functions related to the address type
 */
library AddressUpgradeable {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     *
     * [IMPORTANT]
     * ====
     * You shouldn't rely on `isContract` to protect against flash loan attacks!
     *
     * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
     * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
     * constructor.
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize/address.code.length, which returns 0
        // for contracts in construction, since the code is only stored at the end
        // of the constructor execution.

        return account.code.length > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        (bool success, ) = recipient.call{value: amount}("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain `call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionCall(target, data, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        require(isContract(target), "Address: call to non-contract");

        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        require(isContract(target), "Address: static call to non-contract");

        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly
                /// @solidity memory-safe-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

// SPDX-License-Identifier: LGPL-3.0-only
pragma solidity >=0.7.0 <0.9.0;

/// @title Enum - Collection of enums
/// @author Richard Meissner - <[email protected]>
contract Enum {
    enum Operation {Call, DelegateCall}
}

{
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "metadata": {
    "useLiteralContent": true
  },
  "libraries": {}
}

[{"inputs":[],"name":"AlreadyVoted","type":"error"},{"inputs":[],"name":"NotOwner","type":"error"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint32","name":"freezePeriod","type":"uint32"}],"name":"FreezePeriodUpdated","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"creator","type":"address"}],"name":"FreezeProposalCreated","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint32","name":"freezeProposalPeriod","type":"uint32"}],"name":"FreezeProposalPeriodUpdated","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"voter","type":"address"},{"indexed":false,"internalType":"uint256","name":"votesCast","type":"uint256"}],"name":"FreezeVoteCast","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"freezeVotesThreshold","type":"uint256"}],"name":"FreezeVotesThresholdUpdated","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint8","name":"version","type":"uint8"}],"name":"Initialized","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"owner","type":"address"},{"indexed":true,"internalType":"address","name":"parentGnosisSafe","type":"address"}],"name":"MultisigFreezeVotingSetup","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"},{"inputs":[],"name":"castFreezeVote","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"freezePeriod","outputs":[{"internalType":"uint32","name":"","type":"uint32"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"freezeProposalCreatedBlock","outputs":[{"internalType":"uint32","name":"","type":"uint32"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"freezeProposalPeriod","outputs":[{"internalType":"uint32","name":"","type":"uint32"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"freezeProposalVoteCount","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"freezeVotesThreshold","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"isFrozen","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"parentGnosisSafe","outputs":[{"internalType":"contract ISafe","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes","name":"initializeParams","type":"bytes"}],"name":"setUp","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"unfreeze","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint32","name":"_freezePeriod","type":"uint32"}],"name":"updateFreezePeriod","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint32","name":"_freezeProposalPeriod","type":"uint32"}],"name":"updateFreezeProposalPeriod","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_freezeVotesThreshold","type":"uint256"}],"name":"updateFreezeVotesThreshold","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"},{"internalType":"uint256","name":"","type":"uint256"}],"name":"userHasFreezeVoted","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"}]