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// SPDX-License-Identifier: BUSL-1.1
pragma solidity 0.8.26;

import { PausableUpgradeable } from "../lib/evm-m-extensions/lib/common/lib/openzeppelin-contracts-upgradeable/contracts/utils/PausableUpgradeable.sol";

import { MYieldToOne } from "../lib/evm-m-extensions/src/projects/yieldToOne/MYieldToOne.sol";

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

/**

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██║ ╚═╝ ██║███████╗   ██║   ██║  ██║██║ ╚═╝ ██║██║  ██║███████║██║  ██╗    ╚██████╔╝███████║██████╔╝
╚═╝     ╚═╝╚══════╝   ╚═╝   ╚═╝  ╚═╝╚═╝     ╚═╝╚═╝  ╚═╝╚══════╝╚═╝  ╚═╝     ╚═════╝ ╚══════╝╚═════╝

*/

/**
 * @title  MUSD
 * @notice M extension for the MUSD token.
 * @author M0 Labs
 */
contract MUSD is IMUSD, MYieldToOne, PausableUpgradeable {
    /* ============ Variables ============ */

    /// @inheritdoc IMUSD
    bytes32 public constant PAUSER_ROLE = keccak256("PAUSER_ROLE");

    /// @inheritdoc IMUSD
    bytes32 public constant FORCED_TRANSFER_MANAGER_ROLE = keccak256("FORCED_TRANSFER_MANAGER_ROLE");

    /* ============ Constructor ============ */

    /**
     * @custom:oz-upgrades-unsafe-allow constructor
     * @notice Constructs MUSD Implementation contract
     * @dev    `_disableInitializers()` is called in the inherited MExtension's constructor.
     * @param  mToken       The address of the MToken
     * @param  swapFacility The address of the SwapFacility
     */
    constructor(address mToken, address swapFacility) MYieldToOne(mToken, swapFacility) {}

    /* ============ Initializer ============ */

    /**
     * @dev   Initializes the MUSD token.
     * @param yieldRecipient        The address of a yield destination.
     * @param admin                 The address of an admin.
     * @param freezeManager         The address of a freeze manager.
     * @param yieldRecipientManager The address of a yield recipient setter.
     * @param pauser                The address of a pauser.
     */
    function initialize(
        address yieldRecipient,
        address admin,
        address freezeManager,
        address yieldRecipientManager,
        address pauser,
        address forcedTransferManager
    ) external initializer {
        if (pauser == address(0)) revert ZeroPauser();
        if (forcedTransferManager == address(0)) revert ZeroForcedTransferManager();

        __MYieldToOne_init("MetaMask USD", "mUSD", yieldRecipient, admin, freezeManager, yieldRecipientManager);
        __Pausable_init();

        _grantRole(PAUSER_ROLE, pauser);
        _grantRole(FORCED_TRANSFER_MANAGER_ROLE, forcedTransferManager);
    }

    /* ============ Interactive Functions ============ */

    /// @inheritdoc IMUSD
    function pause() external onlyRole(PAUSER_ROLE) {
        _pause();
    }

    /// @inheritdoc IMUSD
    function unpause() external onlyRole(PAUSER_ROLE) {
        _unpause();
    }

    /// @inheritdoc IMUSD
    function forceTransfer(
        address frozenAccount,
        address recipient,
        uint256 amount
    ) external onlyRole(FORCED_TRANSFER_MANAGER_ROLE) {
        _forceTransfer(frozenAccount, recipient, amount);
    }

    /// @inheritdoc IMUSD
    function forceTransfers(
        address[] calldata frozenAccounts,
        address[] calldata recipients,
        uint256[] calldata amounts
    ) external onlyRole(FORCED_TRANSFER_MANAGER_ROLE) {
        if (frozenAccounts.length != recipients.length || frozenAccounts.length != amounts.length) {
            revert ArrayLengthMismatch();
        }

        for (uint256 i; i < frozenAccounts.length; ++i) {
            _forceTransfer(frozenAccounts[i], recipients[i], amounts[i]);
        }
    }

    /* ============ Hooks For Internal Interactive Functions ============ */

    /**
     * @dev   Hook called before wrapping M into mUSD.
     * @param account   The account from which M is deposited.
     * @param recipient The account receiving the minted mUSD.
     * @param amount    The amount of tokens to wrap.
     */
    function _beforeWrap(address account, address recipient, uint256 amount) internal view override {
        _requireNotPaused();

        super._beforeWrap(account, recipient, amount);
    }

    /**
     * @dev   Hook called before unwrapping mUSD.
     * @param account The account from which mUSD is burned.
     * @param amount  The amount of tokens to unwrap.
     */
    function _beforeUnwrap(address account, uint256 amount) internal view override {
        _requireNotPaused();

        super._beforeUnwrap(account, amount);
    }

    /**
     * @dev   Hook called before transferring mUSD.
     * @param sender    The address from which the tokens are being transferred.
     * @param recipient The address to which the tokens are being transferred.
     * @param amount    The amount of tokens to transfer.
     */
    function _beforeTransfer(address sender, address recipient, uint256 amount) internal view override {
        _requireNotPaused();

        super._beforeTransfer(sender, recipient, amount);
    }

    /**
     * @dev Hook called before claiming yield.
     * @dev MUST only be callable by the `YIELD_RECIPIENT_MANAGER_ROLE`.
     * @dev Addresses with the `YIELD_RECIPIENT_MANAGER_ROLE`
     *      are still able to claim yield when the contract is paused.
     */
    function _beforeClaimYield() internal view override onlyRole(YIELD_RECIPIENT_MANAGER_ROLE) {}

    /* ============ Internal Interactive Functions ============ */

    /**
     * @dev   Internal ERC20 force transfer function to seize funds from a frozen account.
     * @param frozenAccount The frozen account from which tokens are seized.
     * @param recipient     The recipient's address.
     * @param amount        The amount to be transferred.
     * @dev   Force transfer is only allowed for frozen accounts.
     * @dev   No `_beforeTransfer` checks apply to forced transfers; ignore checks for paused and frozen states.
     * @dev   Since this function can only be called by the `FORCED_TRANSFER_MANAGER_ROLE`,
     *        we do not check if the recipient is frozen.
     */
    function _forceTransfer(address frozenAccount, address recipient, uint256 amount) internal {
        _revertIfInvalidRecipient(recipient);
        _revertIfNotFrozen(frozenAccount);

        emit Transfer(frozenAccount, recipient, amount);
        emit ForcedTransfer(frozenAccount, recipient, msg.sender, amount);

        if (amount == 0) return;

        _revertIfInsufficientBalance(frozenAccount, amount);

        _update(frozenAccount, recipient, amount);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.3.0) (utils/Pausable.sol)

pragma solidity ^0.8.20;

import {ContextUpgradeable} from "../utils/ContextUpgradeable.sol";
import {Initializable} from "../proxy/utils/Initializable.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 PausableUpgradeable is Initializable, ContextUpgradeable {
    /// @custom:storage-location erc7201:openzeppelin.storage.Pausable
    struct PausableStorage {
        bool _paused;
    }

    // keccak256(abi.encode(uint256(keccak256("openzeppelin.storage.Pausable")) - 1)) & ~bytes32(uint256(0xff))
    bytes32 private constant PausableStorageLocation = 0xcd5ed15c6e187e77e9aee88184c21f4f2182ab5827cb3b7e07fbedcd63f03300;

    function _getPausableStorage() private pure returns (PausableStorage storage $) {
        assembly {
            $.slot := PausableStorageLocation
        }
    }

    /**
     * @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);

    /**
     * @dev The operation failed because the contract is paused.
     */
    error EnforcedPause();

    /**
     * @dev The operation failed because the contract is not paused.
     */
    error ExpectedPause();

    /**
     * @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();
        _;
    }

    function __Pausable_init() internal onlyInitializing {
    }

    function __Pausable_init_unchained() internal onlyInitializing {
    }
    /**
     * @dev Returns true if the contract is paused, and false otherwise.
     */
    function paused() public view virtual returns (bool) {
        PausableStorage storage $ = _getPausableStorage();
        return $._paused;
    }

    /**
     * @dev Throws if the contract is paused.
     */
    function _requireNotPaused() internal view virtual {
        if (paused()) {
            revert EnforcedPause();
        }
    }

    /**
     * @dev Throws if the contract is not paused.
     */
    function _requirePaused() internal view virtual {
        if (!paused()) {
            revert ExpectedPause();
        }
    }

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

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

// SPDX-License-Identifier: BUSL-1.1

pragma solidity 0.8.26;

import { IERC20 } from "../../../lib/common/src/interfaces/IERC20.sol";

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

import { Freezable } from "../../components/Freezable.sol";
import { MExtension } from "../../MExtension.sol";

abstract contract MYieldToOneStorageLayout {
    /// @custom:storage-location erc7201:M0.storage.MYieldToOne
    struct MYieldToOneStorageStruct {
        uint256 totalSupply;
        address yieldRecipient;
        mapping(address account => uint256 balance) balanceOf;
    }

    // keccak256(abi.encode(uint256(keccak256("M0.storage.MYieldToOne")) - 1)) & ~bytes32(uint256(0xff))
    bytes32 private constant _M_YIELD_TO_ONE_STORAGE_LOCATION =
        0xee2f6fc7e2e5879b17985791e0d12536cba689bda43c77b8911497248f4af100;

    function _getMYieldToOneStorageLocation() internal pure returns (MYieldToOneStorageStruct storage $) {
        assembly {
            $.slot := _M_YIELD_TO_ONE_STORAGE_LOCATION
        }
    }
}

/**
 * @title  MYieldToOne
 * @notice Upgradeable ERC20 Token contract for wrapping M into a non-rebasing token
 *         with yield claimable by a single recipient.
 * @author M0 Labs
 */
contract MYieldToOne is IMYieldToOne, MYieldToOneStorageLayout, MExtension, Freezable {
    /* ============ Variables ============ */

    /// @inheritdoc IMYieldToOne
    bytes32 public constant YIELD_RECIPIENT_MANAGER_ROLE = keccak256("YIELD_RECIPIENT_MANAGER_ROLE");

    /* ============ Constructor ============ */

    /**
     * @custom:oz-upgrades-unsafe-allow constructor
     * @notice Constructs MYieldToOne Implementation contract
     * @dev    Sets immutable storage.
     * @param  mToken       The address of $M token.
     * @param  swapFacility The address of Swap Facility.
     */
    constructor(address mToken, address swapFacility) MExtension(mToken, swapFacility) {}

    /* ============ Initializer ============ */

    /**
     * @dev   Initializes the M extension token with yield claimable by a single recipient.
     * @param name                  The name of the token (e.g. "M Yield to One").
     * @param symbol                The symbol of the token (e.g. "MYO").
     * @param yieldRecipient_       The address of a yield destination.
     * @param admin                 The address of an admin.
     * @param freezeManager         The address of a freeze manager.
     * @param yieldRecipientManager The address of a yield recipient setter.
     */
    function initialize(
        string memory name,
        string memory symbol,
        address yieldRecipient_,
        address admin,
        address freezeManager,
        address yieldRecipientManager
    ) public virtual initializer {
        __MYieldToOne_init(name, symbol, yieldRecipient_, admin, freezeManager, yieldRecipientManager);
    }

    /**
     * @notice Initializes the MYieldToOne token.
     * @param name                  The name of the token (e.g. "M Yield to One").
     * @param symbol                The symbol of the token (e.g. "MYO").
     * @param yieldRecipient_       The address of a yield destination.
     * @param admin                 The address of an admin.
     * @param freezeManager         The address of a freeze manager.
     * @param yieldRecipientManager The address of a yield recipient setter.
     */
    function __MYieldToOne_init(
        string memory name,
        string memory symbol,
        address yieldRecipient_,
        address admin,
        address freezeManager,
        address yieldRecipientManager
    ) internal onlyInitializing {
        if (yieldRecipientManager == address(0)) revert ZeroYieldRecipientManager();
        if (admin == address(0)) revert ZeroAdmin();

        __MExtension_init(name, symbol);
        __Freezable_init(freezeManager);

        _setYieldRecipient(yieldRecipient_);

        _grantRole(DEFAULT_ADMIN_ROLE, admin);
        _grantRole(YIELD_RECIPIENT_MANAGER_ROLE, yieldRecipientManager);
    }

    /* ============ Interactive Functions ============ */

    /// @inheritdoc IMYieldToOne
    function claimYield() public returns (uint256) {
        _beforeClaimYield();

        uint256 yield_ = yield();

        if (yield_ == 0) return 0;

        emit YieldClaimed(yield_);

        _mint(yieldRecipient(), yield_);

        return yield_;
    }

    /// @inheritdoc IMYieldToOne
    function setYieldRecipient(address account) external onlyRole(YIELD_RECIPIENT_MANAGER_ROLE) {
        // Claim yield for the previous yield recipient.
        claimYield();

        _setYieldRecipient(account);
    }

    /* ============ View/Pure Functions ============ */

    /// @inheritdoc IERC20
    function balanceOf(address account) public view override returns (uint256) {
        return _getMYieldToOneStorageLocation().balanceOf[account];
    }

    /// @inheritdoc IERC20
    function totalSupply() public view returns (uint256) {
        return _getMYieldToOneStorageLocation().totalSupply;
    }

    /// @inheritdoc IMYieldToOne
    function yield() public view returns (uint256) {
        unchecked {
            uint256 balance_ = _mBalanceOf(address(this));
            uint256 totalSupply_ = totalSupply();

            return balance_ > totalSupply_ ? balance_ - totalSupply_ : 0;
        }
    }

    /// @inheritdoc IMYieldToOne
    function yieldRecipient() public view returns (address) {
        return _getMYieldToOneStorageLocation().yieldRecipient;
    }

    /* ============ Hooks For Internal Interactive Functions ============ */

    /**
     * @dev    Hooks called before approval of M extension spend.
     * @param  account The account from which M is deposited.
     * @param  spender The account spending M Extension token.
     */
    function _beforeApprove(address account, address spender, uint256 /* amount */) internal view virtual override {
        FreezableStorageStruct storage $ = _getFreezableStorageLocation();

        _revertIfFrozen($, account);
        _revertIfFrozen($, spender);
    }

    /**
     * @dev    Hooks called before wrapping M into M Extension token.
     * @param  account   The account from which M is deposited.
     * @param  recipient The account receiving the minted M Extension token.
     */
    function _beforeWrap(address account, address recipient, uint256 /* amount */) internal view virtual override {
        FreezableStorageStruct storage $ = _getFreezableStorageLocation();

        _revertIfFrozen($, account);
        _revertIfFrozen($, recipient);
    }

    /**
     * @dev   Hook called before unwrapping M Extension token.
     * @param account The account from which M Extension token is burned.
     */
    function _beforeUnwrap(address account, uint256 /* amount */) internal view virtual override {
        _revertIfFrozen(_getFreezableStorageLocation(), account);
    }

    /**
     * @dev   Hook called before transferring M Extension token.
     * @param sender    The address from which the tokens are being transferred.
     * @param recipient The address to which the tokens are being transferred.
     */
    function _beforeTransfer(address sender, address recipient, uint256 /* amount */) internal view virtual override {
        FreezableStorageStruct storage $ = _getFreezableStorageLocation();

        _revertIfFrozen($, msg.sender);

        _revertIfFrozen($, sender);
        _revertIfFrozen($, recipient);
    }

    /**
     * @dev   Hook called before claiming yield from the M Extension token. To be overridden in derived extensions.
     */
    function _beforeClaimYield() internal view virtual {}

    /* ============ Internal Interactive Functions ============ */

    /**
     * @dev   Mints `amount` tokens to `recipient`.
     * @param recipient The address whose account balance will be incremented.
     * @param amount    The present amount of tokens to mint.`
     */
    function _mint(address recipient, uint256 amount) internal override {
        MYieldToOneStorageStruct storage $ = _getMYieldToOneStorageLocation();

        // NOTE: Can be `unchecked` because the max amount of $M is never greater than `type(uint240).max`.
        unchecked {
            $.balanceOf[recipient] += amount;
            $.totalSupply += amount;
        }

        emit Transfer(address(0), recipient, amount);
    }

    /**
     * @dev   Burns `amount` tokens from `account`.
     * @param account The address whose account balance will be decremented.
     * @param amount  The present amount of tokens to burn.
     */
    function _burn(address account, uint256 amount) internal override {
        MYieldToOneStorageStruct storage $ = _getMYieldToOneStorageLocation();

        // NOTE: Can be `unchecked` because `_revertIfInsufficientBalance` is used in MExtension.
        unchecked {
            $.balanceOf[account] -= amount;
            $.totalSupply -= amount;
        }

        emit Transfer(account, address(0), amount);
    }

    /**
     * @dev   Internal balance update function called on transfer.
     * @param sender    The sender's address.
     * @param recipient The recipient's address.
     * @param amount    The amount to be transferred.
     */
    function _update(address sender, address recipient, uint256 amount) internal override {
        MYieldToOneStorageStruct storage $ = _getMYieldToOneStorageLocation();

        // NOTE: Can be `unchecked` because `_revertIfInsufficientBalance` for `sender` is used in MExtension.
        unchecked {
            $.balanceOf[sender] -= amount;
            $.balanceOf[recipient] += amount;
        }
    }

    /**
     * @dev Sets the yield recipient.
     * @param yieldRecipient_ The address of the new yield recipient.
     */
    function _setYieldRecipient(address yieldRecipient_) internal {
        if (yieldRecipient_ == address(0)) revert ZeroYieldRecipient();

        MYieldToOneStorageStruct storage $ = _getMYieldToOneStorageLocation();

        if (yieldRecipient_ == $.yieldRecipient) return;

        $.yieldRecipient = yieldRecipient_;

        emit YieldRecipientSet(yieldRecipient_);
    }
}

// SPDX-License-Identifier: BUSL-1.1
pragma solidity 0.8.26;

/**
 * @title  MUSD Interface
 * @author M0 Labs
 *
 */
interface IMUSD {
    /* ============ Events ============ */

    /**
     * @notice Emitted when tokens are forcefully transferred from a frozen account.
     * @param  frozenAccount The address of the frozen account.
     * @param  recipient The address of the recipient.
     * @param  forcedTransferManager The address of the force transfer manager that triggered the event.
     * @param  amount The amount of tokens transferred.
     */
    event ForcedTransfer(
        address indexed frozenAccount,
        address indexed recipient,
        address indexed forcedTransferManager,
        uint256 amount
    );

    /* ============ Custom Errors ============ */

    /// @notice Emitted in constructor if Pauser is 0x0.
    error ZeroPauser();

    /// @notice Emitted in constructor if Force Transfer Manager is 0x0.
    error ZeroForcedTransferManager();

    /// @notice Emitted when the length of the input arrays do not match in `forceTransfer` method.
    error ArrayLengthMismatch();

    /* ============ Interactive Functions ============ */

    /**
     * @notice Pauses the contract.
     * @dev    Can only be called by an account with the PAUSER_ROLE.
     * @dev    When paused, wrap/unwrap and transfer of tokens are disabled.
     *         Approval is still enabled to allow users to change their allowances.
     *         Addresses with the FORCED_TRANSFER_MANAGER_ROLE can still transfer tokens from frozen accounts.
     *         Addresses with the FREEZE_MANAGER_ROLE can still freeze and unfreeze accounts.
     *         Addresses with the YIELD_RECIPIENT_MANAGER_ROLE can still claim yield.
     */
    function pause() external;

    /**
     * @notice Unpauses the contract.
     * @dev    Can only be called by an account with the PAUSER_ROLE.
     */
    function unpause() external;

    /**
     * @notice Forcefully transfers tokens from a frozen account to a recipient.
     * @dev    Can only be called by an account with the FORCED_TRANSFER_MANAGER_ROLE.
     * @param  frozenAccount The address of the frozen account.
     * @param  recipient The address of the recipient.
     * @param  amount The amount of tokens to transfer.
     */
    function forceTransfer(address frozenAccount, address recipient, uint256 amount) external;

    /**
     * @notice Forcefully transfers tokens from frozen accounts to recipients.
     * @dev    Can only be called by an account with the FORCED_TRANSFER_MANAGER_ROLE.
     * @param  frozenAccounts The addresses of the frozen accounts.
     * @param  recipients The addresses of the recipients.
     * @param  amounts The amounts of tokens to transfer.
     */
    function forceTransfers(
        address[] calldata frozenAccounts,
        address[] calldata recipients,
        uint256[] calldata amounts
    ) external;

    /* ============ View/Pure Functions ============ */

    /// @notice The role that can pause and unpause the contract.
    function PAUSER_ROLE() external view returns (bytes32);

    /// @notice The role that can force transfer tokens from frozen accounts.
    function FORCED_TRANSFER_MANAGER_ROLE() external view returns (bytes32);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.1) (utils/Context.sol)

pragma solidity ^0.8.20;
import {Initializable} from "../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;
    }

    function _contextSuffixLength() internal view virtual returns (uint256) {
        return 0;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.3.0) (proxy/utils/Initializable.sol)

pragma solidity ^0.8.20;

/**
 * @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]
 * ```solidity
 * 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 Storage of the initializable contract.
     *
     * It's implemented on a custom ERC-7201 namespace to reduce the risk of storage collisions
     * when using with upgradeable contracts.
     *
     * @custom:storage-location erc7201:openzeppelin.storage.Initializable
     */
    struct InitializableStorage {
        /**
         * @dev Indicates that the contract has been initialized.
         */
        uint64 _initialized;
        /**
         * @dev Indicates that the contract is in the process of being initialized.
         */
        bool _initializing;
    }

    // keccak256(abi.encode(uint256(keccak256("openzeppelin.storage.Initializable")) - 1)) & ~bytes32(uint256(0xff))
    bytes32 private constant INITIALIZABLE_STORAGE = 0xf0c57e16840df040f15088dc2f81fe391c3923bec73e23a9662efc9c229c6a00;

    /**
     * @dev The contract is already initialized.
     */
    error InvalidInitialization();

    /**
     * @dev The contract is not initializing.
     */
    error NotInitializing();

    /**
     * @dev Triggered when the contract has been initialized or reinitialized.
     */
    event Initialized(uint64 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.
     *
     * Similar to `reinitializer(1)`, except that in the context of a constructor an `initializer` may be invoked any
     * number of times. This behavior in the constructor can be useful during testing and is not expected to be used in
     * production.
     *
     * Emits an {Initialized} event.
     */
    modifier initializer() {
        // solhint-disable-next-line var-name-mixedcase
        InitializableStorage storage $ = _getInitializableStorage();

        // Cache values to avoid duplicated sloads
        bool isTopLevelCall = !$._initializing;
        uint64 initialized = $._initialized;

        // Allowed calls:
        // - initialSetup: the contract is not in the initializing state and no previous version was
        //                 initialized
        // - construction: the contract is initialized at version 1 (no reinitialization) and the
        //                 current contract is just being deployed
        bool initialSetup = initialized == 0 && isTopLevelCall;
        bool construction = initialized == 1 && address(this).code.length == 0;

        if (!initialSetup && !construction) {
            revert InvalidInitialization();
        }
        $._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.
     *
     * 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.
     *
     * When `version` is 1, this modifier is similar to `initializer`, except that functions marked with `reinitializer`
     * cannot be nested. If one is invoked in the context of another, execution will revert.
     *
     * 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.
     *
     * WARNING: Setting the version to 2**64 - 1 will prevent any future reinitialization.
     *
     * Emits an {Initialized} event.
     */
    modifier reinitializer(uint64 version) {
        // solhint-disable-next-line var-name-mixedcase
        InitializableStorage storage $ = _getInitializableStorage();

        if ($._initializing || $._initialized >= version) {
            revert InvalidInitialization();
        }
        $._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() {
        _checkInitializing();
        _;
    }

    /**
     * @dev Reverts if the contract is not in an initializing state. See {onlyInitializing}.
     */
    function _checkInitializing() internal view virtual {
        if (!_isInitializing()) {
            revert NotInitializing();
        }
    }

    /**
     * @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.
     *
     * Emits an {Initialized} event the first time it is successfully executed.
     */
    function _disableInitializers() internal virtual {
        // solhint-disable-next-line var-name-mixedcase
        InitializableStorage storage $ = _getInitializableStorage();

        if ($._initializing) {
            revert InvalidInitialization();
        }
        if ($._initialized != type(uint64).max) {
            $._initialized = type(uint64).max;
            emit Initialized(type(uint64).max);
        }
    }

    /**
     * @dev Returns the highest version that has been initialized. See {reinitializer}.
     */
    function _getInitializedVersion() internal view returns (uint64) {
        return _getInitializableStorage()._initialized;
    }

    /**
     * @dev Returns `true` if the contract is currently initializing. See {onlyInitializing}.
     */
    function _isInitializing() internal view returns (bool) {
        return _getInitializableStorage()._initializing;
    }

    /**
     * @dev Pointer to storage slot. Allows integrators to override it with a custom storage location.
     *
     * NOTE: Consider following the ERC-7201 formula to derive storage locations.
     */
    function _initializableStorageSlot() internal pure virtual returns (bytes32) {
        return INITIALIZABLE_STORAGE;
    }

    /**
     * @dev Returns a pointer to the storage namespace.
     */
    // solhint-disable-next-line var-name-mixedcase
    function _getInitializableStorage() private pure returns (InitializableStorage storage $) {
        bytes32 slot = _initializableStorageSlot();
        assembly {
            $.slot := slot
        }
    }
}

// SPDX-License-Identifier: GPL-3.0

pragma solidity >=0.8.20 <0.9.0;

/**
 * @title  ERC20 Token Standard.
 * @author M^0 Labs
 * @dev    The interface as defined by EIP-20: https://eips.ethereum.org/EIPS/eip-20
 */
interface IERC20 {
    /* ============ Events ============ */

    /**
     * @notice Emitted when `spender` has been approved for `amount` of the token balance of `account`.
     * @param  account The address of the account.
     * @param  spender The address of the spender being approved for the allowance.
     * @param  amount  The amount of the allowance being approved.
     */
    event Approval(address indexed account, address indexed spender, uint256 amount);

    /**
     * @notice Emitted when `amount` tokens is transferred from `sender` to `recipient`.
     * @param  sender    The address of the sender who's token balance is decremented.
     * @param  recipient The address of the recipient who's token balance is incremented.
     * @param  amount    The amount of tokens being transferred.
     */
    event Transfer(address indexed sender, address indexed recipient, uint256 amount);

    /* ============ Interactive Functions ============ */

    /**
     * @notice Allows a calling account to approve `spender` to spend up to `amount` of its token balance.
     * @dev    MUST emit an `Approval` event.
     * @param  spender The address of the account being allowed to spend up to the allowed amount.
     * @param  amount  The amount of the allowance being approved.
     * @return Whether or not the approval was successful.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @notice Allows a calling account to transfer `amount` tokens to `recipient`.
     * @param  recipient The address of the recipient who's token balance will be incremented.
     * @param  amount    The amount of tokens being transferred.
     * @return Whether or not the transfer was successful.
     */
    function transfer(address recipient, uint256 amount) external returns (bool);

    /**
     * @notice Allows a calling account to transfer `amount` tokens from `sender`, with allowance, to a `recipient`.
     * @param  sender    The address of the sender who's token balance will be decremented.
     * @param  recipient The address of the recipient who's token balance will be incremented.
     * @param  amount    The amount of tokens being transferred.
     * @return Whether or not the transfer was successful.
     */
    function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);

    /* ============ View/Pure Functions ============ */

    /**
     * @notice Returns the allowance `spender` is allowed to spend on behalf of `account`.
     * @param  account The address of the account who's token balance `spender` is allowed to spend.
     * @param  spender The address of an account allowed to spend on behalf of `account`.
     * @return The amount `spender` can spend on behalf of `account`.
     */
    function allowance(address account, address spender) external view returns (uint256);

    /**
     * @notice Returns the token balance of `account`.
     * @param  account The address of some account.
     * @return The token balance of `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /// @notice Returns the number of decimals UIs should assume all amounts have.
    function decimals() external view returns (uint8);

    /// @notice Returns the name of the contract/token.
    function name() external view returns (string memory);

    /// @notice Returns the symbol of the token.
    function symbol() external view returns (string memory);

    /// @notice Returns the current total supply of the token.
    function totalSupply() external view returns (uint256);
}

// SPDX-License-Identifier: BUSL-1.1

pragma solidity 0.8.26;

/**
 * @title M Extension where all yield is claimable by a single recipient.
 * @author M0 Labs
 */
interface IMYieldToOne {
    /* ============ Events ============ */

    /**
     * @notice Emitted when this contract's excess M is claimed.
     * @param  yield The amount of M yield claimed.
     */
    event YieldClaimed(uint256 yield);

    /**
     * @notice Emitted when the yield recipient is set.
     * @param  yieldRecipient The address of the new yield recipient.
     */
    event YieldRecipientSet(address indexed yieldRecipient);

    /* ============ Custom Errors ============ */

    /// @notice Emitted in constructor if Yield Recipient is 0x0.
    error ZeroYieldRecipient();

    /// @notice Emitted in constructor if Yield Recipient Manager is 0x0.
    error ZeroYieldRecipientManager();

    /// @notice Emitted in constructor if Admin is 0x0.
    error ZeroAdmin();

    /* ============ Interactive Functions ============ */

    /// @notice Claims accrued yield to yield recipient.
    function claimYield() external returns (uint256);

    /**
     * @notice Sets the yield recipient.
     * @dev    MUST only be callable by the YIELD_RECIPIENT_MANAGER_ROLE.
     * @dev    SHOULD revert if `yieldRecipient` is 0x0.
     * @dev    SHOULD return early if the `yieldRecipient` is already the actual yield recipient.
     * @param  yieldRecipient The address of the new yield recipient.
     */
    function setYieldRecipient(address yieldRecipient) external;

    /* ============ View/Pure Functions ============ */

    /// @notice The role that can manage the yield recipient.
    function YIELD_RECIPIENT_MANAGER_ROLE() external view returns (bytes32);

    /// @notice The amount of accrued yield.
    function yield() external view returns (uint256);

    /// @notice The address of the yield recipient.
    function yieldRecipient() external view returns (address);
}

// SPDX-License-Identifier: BUSL-1.1

pragma solidity 0.8.26;

import {
    AccessControlUpgradeable
} from "../../lib/common/lib/openzeppelin-contracts-upgradeable/contracts/access/AccessControlUpgradeable.sol";

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

abstract contract FreezableStorageLayout {
    /// @custom:storage-location erc7201:M0.storage.Freezable
    struct FreezableStorageStruct {
        mapping(address account => bool isFrozen) isFrozen;
    }

    // keccak256(abi.encode(uint256(keccak256("M0.storage.Freezable")) - 1)) & ~bytes32(uint256(0xff))
    bytes32 private constant _FREEZABLE_STORAGE_LOCATION =
        0x2fd5767309dce890c526ace85d7fe164825199d7dcd99c33588befc51b32ce00;

    function _getFreezableStorageLocation() internal pure returns (FreezableStorageStruct storage $) {
        assembly {
            $.slot := _FREEZABLE_STORAGE_LOCATION
        }
    }
}

/**
 * @title Freezable
 * @notice Upgradeable contract that allows for the freezing of accounts.
 * @dev This contract is used to prevent certain accounts from interacting with the contract.
 * @author M0 Labs
 */
abstract contract Freezable is IFreezable, FreezableStorageLayout, AccessControlUpgradeable {
    /* ============ Variables ============ */

    /// @inheritdoc IFreezable
    bytes32 public constant FREEZE_MANAGER_ROLE = keccak256("FREEZE_MANAGER_ROLE");

    /* ============ Initializer ============ */

    /**
     * @notice Initializes the contract with the given freeze manager.
     * @param freezeManager The address of a freeze manager.
     */
    function __Freezable_init(address freezeManager) internal onlyInitializing {
        if (freezeManager == address(0)) revert ZeroFreezeManager();
        _grantRole(FREEZE_MANAGER_ROLE, freezeManager);
    }

    /* ============ Interactive Functions ============ */

    /// @inheritdoc IFreezable
    function freeze(address account) external onlyRole(FREEZE_MANAGER_ROLE) {
        _freeze(_getFreezableStorageLocation(), account);
    }

    /// @inheritdoc IFreezable
    function freezeAccounts(address[] calldata accounts) external onlyRole(FREEZE_MANAGER_ROLE) {
        FreezableStorageStruct storage $ = _getFreezableStorageLocation();

        for (uint256 i; i < accounts.length; ++i) {
            _freeze($, accounts[i]);
        }
    }

    /// @inheritdoc IFreezable
    function unfreeze(address account) external onlyRole(FREEZE_MANAGER_ROLE) {
        _unfreeze(_getFreezableStorageLocation(), account);
    }

    /// @inheritdoc IFreezable
    function unfreezeAccounts(address[] calldata accounts) external onlyRole(FREEZE_MANAGER_ROLE) {
        FreezableStorageStruct storage $ = _getFreezableStorageLocation();

        for (uint256 i; i < accounts.length; ++i) {
            _unfreeze($, accounts[i]);
        }
    }

    /* ============ View/Pure Functions ============ */

    /// @inheritdoc IFreezable
    function isFrozen(address account) public view returns (bool) {
        return _getFreezableStorageLocation().isFrozen[account];
    }

    /* ============ Internal Interactive Functions ============ */

    /**
     * @notice Internal function that freezes an account.
     * @param $ The storage location of the freezable contract.
     * @param account The account to freeze.
     */
    function _freeze(FreezableStorageStruct storage $, address account) internal {
        _revertIfFrozen($, account);

        $.isFrozen[account] = true;

        emit Frozen(account, block.timestamp);
    }

    /**
     * @notice Internal function that unfreezes an account.
     * @param $ The storage location of the freezable contract.
     * @param account The account to unfreeze.
     */
    function _unfreeze(FreezableStorageStruct storage $, address account) internal {
        _revertIfNotFrozen($, account);

        $.isFrozen[account] = false;

        emit Unfrozen(account, block.timestamp);
    }

    /* ============ Internal View/Pure Functions ============ */

    /**
     * @notice Internal function that reverts if an account is frozen.
     * @param $ The storage location of the freezable contract.
     * @param account The account to check.
     */
    function _revertIfFrozen(FreezableStorageStruct storage $, address account) internal view {
        if ($.isFrozen[account]) revert AccountFrozen(account);
    }

    /**
     * @notice Internal function that reverts if an account is frozen.
     * @param account The account to check.
     */
    function _revertIfFrozen(address account) internal view {
        if (_getFreezableStorageLocation().isFrozen[account]) revert AccountFrozen(account);
    }

    /**
     * @notice Internal function that reverts if an account is not frozen.
     * @param $ The storage location of the freezable contract.
     * @param account The account to check.
     */
    function _revertIfNotFrozen(FreezableStorageStruct storage $, address account) internal view {
        if (!$.isFrozen[account]) revert AccountNotFrozen(account);
    }

    /**
     * @notice Internal function that reverts if an account is not frozen.
     * @param account The account to check.
     */
    function _revertIfNotFrozen(address account) internal view {
        if (!_getFreezableStorageLocation().isFrozen[account]) revert AccountNotFrozen(account);
    }
}

// SPDX-License-Identifier: BUSL-1.1

pragma solidity 0.8.26;

import { ERC20ExtendedUpgradeable } from "../lib/common/src/ERC20ExtendedUpgradeable.sol";

import { IERC20 } from "../lib/common/src/interfaces/IERC20.sol";

import { IMTokenLike } from "./interfaces/IMTokenLike.sol";
import { IMExtension } from "./interfaces/IMExtension.sol";
import { ISwapFacility } from "./swap/interfaces/ISwapFacility.sol";

/**
 * @title  MExtension
 * @notice Upgradeable ERC20 Token contract for wrapping M into a non-rebasing token.
 * @author M0 Labs
 */
abstract contract MExtension is IMExtension, ERC20ExtendedUpgradeable {
    /* ============ Variables ============ */

    /// @custom:oz-upgrades-unsafe-allow state-variable-immutable
    /// @inheritdoc IMExtension
    address public immutable mToken;

    /// @custom:oz-upgrades-unsafe-allow state-variable-immutable
    /// @inheritdoc IMExtension
    address public immutable swapFacility;

    /* ============ Modifiers ============ */

    /// @dev Modifier to check if caller is SwapFacility.
    modifier onlySwapFacility() {
        if (msg.sender != swapFacility) revert NotSwapFacility();
        _;
    }

    /* ============ Constructor ============ */

    /**
     * @custom:oz-upgrades-unsafe-allow constructor
     * @notice Constructs MExtension Implementation contract
     * @dev    Sets immutable storage.
     * @param  mToken_       The address of $M token.
     * @param  swapFacility_ The address of Swap Facility.
     */
    constructor(address mToken_, address swapFacility_) {
        _disableInitializers();

        if ((mToken = mToken_) == address(0)) revert ZeroMToken();
        if ((swapFacility = swapFacility_) == address(0)) revert ZeroSwapFacility();
    }

    /* ============ Initializer ============ */

    /**
     * @notice Initializes the generic M extension token.
     * @param name          The name of the token (e.g. "HALO USD").
     * @param symbol        The symbol of the token (e.g. "HUSD").
     */
    function __MExtension_init(string memory name, string memory symbol) internal onlyInitializing {
        __ERC20ExtendedUpgradeable_init(name, symbol, 6);
    }

    /* ============ Interactive Functions ============ */

    /// @inheritdoc IMExtension
    function wrap(address recipient, uint256 amount) external onlySwapFacility {
        // NOTE: `msg.sender` is always SwapFacility contract.
        //       `ISwapFacility.msgSender()` is used to ensure that the original caller is passed to `_beforeWrap`.
        _wrap(ISwapFacility(msg.sender).msgSender(), recipient, amount);
    }

    /// @inheritdoc IMExtension
    function unwrap(address /* recipient */, uint256 amount) external onlySwapFacility {
        // NOTE: `msg.sender` is always SwapFacility contract.
        //       `ISwapFacility.msgSender()` is used to ensure that the original caller is passed to `_beforeUnwrap`.
        // NOTE: `recipient` is not used in this function as the $M is always sent to SwapFacility contract.
        _unwrap(ISwapFacility(msg.sender).msgSender(), amount);
    }

    /// @inheritdoc IMExtension
    function enableEarning() external virtual {
        if (isEarningEnabled()) revert EarningIsEnabled();

        emit EarningEnabled(currentIndex());

        IMTokenLike(mToken).startEarning();
    }

    /// @inheritdoc IMExtension
    function disableEarning() external virtual {
        if (!isEarningEnabled()) revert EarningIsDisabled();

        emit EarningDisabled(currentIndex());

        IMTokenLike(mToken).stopEarning(address(this));
    }

    /* ============ View/Pure Functions ============ */

    /// @inheritdoc IMExtension
    function currentIndex() public view virtual returns (uint128) {
        return IMTokenLike(mToken).currentIndex();
    }

    /// @inheritdoc IMExtension
    function isEarningEnabled() public view virtual returns (bool) {
        return IMTokenLike(mToken).isEarning(address(this));
    }

    /// @inheritdoc IERC20
    function balanceOf(address account) public view virtual returns (uint256);

    /* ============ Hooks For Internal Interactive Functions ============ */

    /**
     * @dev   Hook called before approval of M Extension token.
     * @param account   The sender's address.
     * @param spender   The spender address.
     * @param amount    The amount to be approved.
     */
    function _beforeApprove(address account, address spender, uint256 amount) internal virtual {}

    /**
     * @dev    Hook called before wrapping M into M Extension token.
     * @param  account   The account from which M is deposited.
     * @param  recipient The account receiving the minted M Extension token.
     * @param  amount    The amount of M deposited.
     */
    function _beforeWrap(address account, address recipient, uint256 amount) internal virtual {}

    /**
     * @dev   Hook called before unwrapping M Extension token.
     * @param account   The account from which M Extension token is burned.
     * @param amount    The amount of M Extension token burned.
     */
    function _beforeUnwrap(address account, uint256 amount) internal virtual {}

    /**
     * @dev   Hook called before transferring M Extension token.
     * @param sender    The sender's address.
     * @param recipient The recipient's address.
     * @param amount    The amount to be transferred.
     */
    function _beforeTransfer(address sender, address recipient, uint256 amount) internal virtual {}

    /* ============ Internal Interactive Functions ============ */

    /**
     * @dev Approve `spender` to spend `amount` of tokens from `account`.
     * @param account The address approving the allowance.
     * @param spender The address approved to spend the tokens.
     * @param amount  The amount of tokens being approved for spending.
     */
    function _approve(address account, address spender, uint256 amount) internal override {
        // NOTE: Add extension-specific checks before approval.
        _beforeApprove(account, spender, amount);

        super._approve(account, spender, amount);
    }

    /**
     * @dev    Wraps `amount` M from `account` into M Extension for `recipient`.
     * @param  account   The original caller of SwapFacility functions.
     * @param  recipient The account receiving the minted M Extension token.
     * @param  amount    The amount of M deposited.
     */
    function _wrap(address account, address recipient, uint256 amount) internal {
        _revertIfInvalidRecipient(recipient);
        _revertIfInsufficientAmount(amount);

        // NOTE: Add extension-specific checks before wrapping.
        _beforeWrap(account, recipient, amount);

        // NOTE: `msg.sender` is always SwapFacility contract.
        // NOTE: The behavior of `IMTokenLike.transferFrom` is known, so its return can be ignored.
        IMTokenLike(mToken).transferFrom(msg.sender, address(this), amount);

        // NOTE: This method is overridden by the inheriting M Extension contract.
        // NOTE: Mints precise amount of $M Extension token to `recipient`.
        //       Option 1: $M transfer from an $M earner to another $M earner ($M Extension in earning state): rounds up → rounds up,
        //                 0, 1, or XX extra wei may be locked in M Extension compared to the minted amount of $M Extension token.
        //       Option 2: $M transfer from an $M non-earner to an $M earner ($M Extension in earning state): precise $M transfer → rounds down,
        //                 0, -1, or -XX wei may be locked in $M Extension compared to the minted amount of $M Extension token.
        //
        _mint(recipient, amount);
    }

    /**
     * @dev    Unwraps `amount` M Extension token from `account` into $M and transfers to SwapFacility.
     * @param  account   The original caller of SwapFacility functions.
     * @param  amount    The amount of M Extension token burned.
     */
    function _unwrap(address account, uint256 amount) internal {
        _revertIfInsufficientAmount(amount);

        // NOTE: Add extension-specific checks before unwrapping.
        _beforeUnwrap(account, amount);

        _revertIfInsufficientBalance(msg.sender, amount);

        // NOTE: This method will be overridden by the inheriting M Extension contract.
        // NOTE: Computes the actual decrease in the $M balance of the $M Extension contract.
        //       Option 1: $M transfer from an $M earner ($M Extension in earning state) to another $M earner: round up → rounds up.
        //       Option 2: $M transfer from an $M earner ($M Extension in earning state) to an $M non-earner: round up → precise $M transfer.
        //       In both cases, 0, 1, or XX extra wei may be deducted from the $M Extension contract's $M balance compared to the burned amount of $M Extension token.
        // NOTE: Always burn from SwapFacility as it is the only contract that can call this function.
        _burn(msg.sender, amount);

        // NOTE: The behavior of `IMTokenLike.transfer` is known, so its return can be ignored.
        // NOTE: `msg.sender` is always SwapFacility contract.
        IMTokenLike(mToken).transfer(msg.sender, amount);
    }

    /**
     * @dev   Mints `amount` tokens to `recipient`.
     * @param recipient The address to which the tokens will be minted.
     * @param amount    The amount of tokens to mint.
     */
    function _mint(address recipient, uint256 amount) internal virtual;

    /**
     * @dev   Burns `amount` tokens from `account`.
     * @param account The address from which the tokens will be burned.
     * @param amount  The amount of tokens to burn.
     */
    function _burn(address account, uint256 amount) internal virtual;

    /**
     * @dev   Internal balance update function that needs to be implemented by the inheriting contract.
     * @param sender    The sender's address.
     * @param recipient The recipient's address.
     * @param amount    The amount to be transferred.
     */
    function _update(address sender, address recipient, uint256 amount) internal virtual;

    /**
     * @dev   Internal ERC20 transfer function.
     * @param sender    The sender's address.
     * @param recipient The recipient's address.
     * @param amount    The amount to be transferred.
     */
    function _transfer(address sender, address recipient, uint256 amount) internal override {
        _revertIfInvalidRecipient(recipient);

        // NOTE: Add extension-specific checks before transfers.
        _beforeTransfer(sender, recipient, amount);

        emit Transfer(sender, recipient, amount);

        if (amount == 0) return;

        _revertIfInsufficientBalance(sender, amount);

        // NOTE: This method will be overridden by the inheriting M Extension contract.
        _update(sender, recipient, amount);
    }

    /* ============ Internal View/Pure Functions ============ */

    /**
     * @dev    Returns the M Token balance of `account`.
     * @param  account The account being queried.
     * @return balance The M Token balance of the account.
     */
    function _mBalanceOf(address account) internal view returns (uint256) {
        return IMTokenLike(mToken).balanceOf(account);
    }

    /**
     * @dev   Reverts if `recipient` is address(0).
     * @param recipient Address of a recipient.
     */
    function _revertIfInvalidRecipient(address recipient) internal pure {
        if (recipient == address(0)) revert InvalidRecipient(recipient);
    }

    /**
     * @dev   Reverts if `amount` is equal to 0.
     * @param amount Amount of token.
     */
    function _revertIfInsufficientAmount(uint256 amount) internal pure {
        if (amount == 0) revert InsufficientAmount(amount);
    }

    /**
     * @dev   Reverts if `account` balance is below `amount`.
     * @param account Address of an account.
     * @param amount  Amount to transfer or burn.
     */
    function _revertIfInsufficientBalance(address account, uint256 amount) internal view {
        uint256 balance = balanceOf(account);

        if (balance < amount) revert InsufficientBalance(account, balance, amount);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.3.0) (access/AccessControl.sol)

pragma solidity ^0.8.20;

import {IAccessControl} from "@openzeppelin/contracts/access/IAccessControl.sol";
import {ContextUpgradeable} from "../utils/ContextUpgradeable.sol";
import {ERC165Upgradeable} from "../utils/introspection/ERC165Upgradeable.sol";
import {Initializable} from "../proxy/utils/Initializable.sol";

/**
 * @dev Contract module that allows children to implement role-based access
 * control mechanisms. This is a lightweight version that doesn't allow enumerating role
 * members except through off-chain means by accessing the contract event logs. Some
 * applications may benefit from on-chain enumerability, for those cases see
 * {AccessControlEnumerable}.
 *
 * Roles are referred to by their `bytes32` identifier. These should be exposed
 * in the external API and be unique. The best way to achieve this is by
 * using `public constant` hash digests:
 *
 * ```solidity
 * bytes32 public constant MY_ROLE = keccak256("MY_ROLE");
 * ```
 *
 * Roles can be used to represent a set of permissions. To restrict access to a
 * function call, use {hasRole}:
 *
 * ```solidity
 * function foo() public {
 *     require(hasRole(MY_ROLE, msg.sender));
 *     ...
 * }
 * ```
 *
 * Roles can be granted and revoked dynamically via the {grantRole} and
 * {revokeRole} functions. Each role has an associated admin role, and only
 * accounts that have a role's admin role can call {grantRole} and {revokeRole}.
 *
 * By default, the admin role for all roles is `DEFAULT_ADMIN_ROLE`, which means
 * that only accounts with this role will be able to grant or revoke other
 * roles. More complex role relationships can be created by using
 * {_setRoleAdmin}.
 *
 * WARNING: The `DEFAULT_ADMIN_ROLE` is also its own admin: it has permission to
 * grant and revoke this role. Extra precautions should be taken to secure
 * accounts that have been granted it. We recommend using {AccessControlDefaultAdminRules}
 * to enforce additional security measures for this role.
 */
abstract contract AccessControlUpgradeable is Initializable, ContextUpgradeable, IAccessControl, ERC165Upgradeable {
    struct RoleData {
        mapping(address account => bool) hasRole;
        bytes32 adminRole;
    }

    bytes32 public constant DEFAULT_ADMIN_ROLE = 0x00;


    /// @custom:storage-location erc7201:openzeppelin.storage.AccessControl
    struct AccessControlStorage {
        mapping(bytes32 role => RoleData) _roles;
    }

    // keccak256(abi.encode(uint256(keccak256("openzeppelin.storage.AccessControl")) - 1)) & ~bytes32(uint256(0xff))
    bytes32 private constant AccessControlStorageLocation = 0x02dd7bc7dec4dceedda775e58dd541e08a116c6c53815c0bd028192f7b626800;

    function _getAccessControlStorage() private pure returns (AccessControlStorage storage $) {
        assembly {
            $.slot := AccessControlStorageLocation
        }
    }

    /**
     * @dev Modifier that checks that an account has a specific role. Reverts
     * with an {AccessControlUnauthorizedAccount} error including the required role.
     */
    modifier onlyRole(bytes32 role) {
        _checkRole(role);
        _;
    }

    function __AccessControl_init() internal onlyInitializing {
    }

    function __AccessControl_init_unchained() internal onlyInitializing {
    }
    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        return interfaceId == type(IAccessControl).interfaceId || super.supportsInterface(interfaceId);
    }

    /**
     * @dev Returns `true` if `account` has been granted `role`.
     */
    function hasRole(bytes32 role, address account) public view virtual returns (bool) {
        AccessControlStorage storage $ = _getAccessControlStorage();
        return $._roles[role].hasRole[account];
    }

    /**
     * @dev Reverts with an {AccessControlUnauthorizedAccount} error if `_msgSender()`
     * is missing `role`. Overriding this function changes the behavior of the {onlyRole} modifier.
     */
    function _checkRole(bytes32 role) internal view virtual {
        _checkRole(role, _msgSender());
    }

    /**
     * @dev Reverts with an {AccessControlUnauthorizedAccount} error if `account`
     * is missing `role`.
     */
    function _checkRole(bytes32 role, address account) internal view virtual {
        if (!hasRole(role, account)) {
            revert AccessControlUnauthorizedAccount(account, role);
        }
    }

    /**
     * @dev Returns the admin role that controls `role`. See {grantRole} and
     * {revokeRole}.
     *
     * To change a role's admin, use {_setRoleAdmin}.
     */
    function getRoleAdmin(bytes32 role) public view virtual returns (bytes32) {
        AccessControlStorage storage $ = _getAccessControlStorage();
        return $._roles[role].adminRole;
    }

    /**
     * @dev Grants `role` to `account`.
     *
     * If `account` had not been already granted `role`, emits a {RoleGranted}
     * event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     *
     * May emit a {RoleGranted} event.
     */
    function grantRole(bytes32 role, address account) public virtual onlyRole(getRoleAdmin(role)) {
        _grantRole(role, account);
    }

    /**
     * @dev Revokes `role` from `account`.
     *
     * If `account` had been granted `role`, emits a {RoleRevoked} event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     *
     * May emit a {RoleRevoked} event.
     */
    function revokeRole(bytes32 role, address account) public virtual onlyRole(getRoleAdmin(role)) {
        _revokeRole(role, account);
    }

    /**
     * @dev Revokes `role` from the calling account.
     *
     * Roles are often managed via {grantRole} and {revokeRole}: this function's
     * purpose is to provide a mechanism for accounts to lose their privileges
     * if they are compromised (such as when a trusted device is misplaced).
     *
     * If the calling account had been revoked `role`, emits a {RoleRevoked}
     * event.
     *
     * Requirements:
     *
     * - the caller must be `callerConfirmation`.
     *
     * May emit a {RoleRevoked} event.
     */
    function renounceRole(bytes32 role, address callerConfirmation) public virtual {
        if (callerConfirmation != _msgSender()) {
            revert AccessControlBadConfirmation();
        }

        _revokeRole(role, callerConfirmation);
    }

    /**
     * @dev Sets `adminRole` as ``role``'s admin role.
     *
     * Emits a {RoleAdminChanged} event.
     */
    function _setRoleAdmin(bytes32 role, bytes32 adminRole) internal virtual {
        AccessControlStorage storage $ = _getAccessControlStorage();
        bytes32 previousAdminRole = getRoleAdmin(role);
        $._roles[role].adminRole = adminRole;
        emit RoleAdminChanged(role, previousAdminRole, adminRole);
    }

    /**
     * @dev Attempts to grant `role` to `account` and returns a boolean indicating if `role` was granted.
     *
     * Internal function without access restriction.
     *
     * May emit a {RoleGranted} event.
     */
    function _grantRole(bytes32 role, address account) internal virtual returns (bool) {
        AccessControlStorage storage $ = _getAccessControlStorage();
        if (!hasRole(role, account)) {
            $._roles[role].hasRole[account] = true;
            emit RoleGranted(role, account, _msgSender());
            return true;
        } else {
            return false;
        }
    }

    /**
     * @dev Attempts to revoke `role` from `account` and returns a boolean indicating if `role` was revoked.
     *
     * Internal function without access restriction.
     *
     * May emit a {RoleRevoked} event.
     */
    function _revokeRole(bytes32 role, address account) internal virtual returns (bool) {
        AccessControlStorage storage $ = _getAccessControlStorage();
        if (hasRole(role, account)) {
            $._roles[role].hasRole[account] = false;
            emit RoleRevoked(role, account, _msgSender());
            return true;
        } else {
            return false;
        }
    }
}

// SPDX-License-Identifier: BUSL-1.1

pragma solidity 0.8.26;

/**
 * @title Freezable interface.
 * @author M0 Labs
 */
interface IFreezable {
    /* ============ Events ============ */

    /**
     * @notice Emitted when an account is frozen.
     * @param account The address of the frozen account.
     * @param timestamp The timestamp at which the account was frozen.
     */
    event Frozen(address indexed account, uint256 timestamp);

    /**
     * @notice Emitted when an account is unfrozen.
     * @param account The address of the unfrozen account.
     * @param timestamp The timestamp at which the account was unfrozen.
     */
    event Unfrozen(address indexed account, uint256 timestamp);

    /* ============ Errors ============ */

    /**
     * @notice Emitted when a frozen account attempts to interact with the contract.
     * @param account The address of the frozen account.
     */
    error AccountFrozen(address account);

    /**
     * @notice Emitted when trying to unfreeze a non-frozen account.
     * @param account The address of the account that is not frozen.
     */
    error AccountNotFrozen(address account);

    /// @notice Emitted if no freeze manager is set.
    error ZeroFreezeManager();

    /* ============ Interactive Functions ============ */

    /**
     * @notice Freezes an account.
     * @dev MUST only be callable by the FREEZE_MANAGER_ROLE.
     * @dev SHOULD revert if the account is already frozen.
     * @param account The address of the account to freeze.
     */
    function freeze(address account) external;

    /**
     * @notice Freezes multiple accounts.
     * @dev MUST only be callable by the FREEZE_MANAGER_ROLE.
     * @dev SHOULD revert if any of the accounts are already frozen.
     * @param accounts The list of addresses to freeze.
     */
    function freezeAccounts(address[] calldata accounts) external;

    /**
     * @notice Unfreezes an account.
     * @dev MUST only be callable by the FREEZE_MANAGER_ROLE.
     * @dev SHOULD revert if the account is not frozen.
     * @param account The address of the account to unfreeze.
     */
    function unfreeze(address account) external;

    /**
     * @notice Unfreezes multiple accounts.
     * @dev MUST only be callable by the FREEZE_MANAGER_ROLE.
     * @dev SHOULD revert if any of the accounts are not frozen.
     * @param accounts The list of addresses to unfreeze.
     */
    function unfreezeAccounts(address[] calldata accounts) external;

    /* ============ View/Pure Functions ============ */

    /// @notice The role that can manage the freezelist.
    function FREEZE_MANAGER_ROLE() external view returns (bytes32);

    /**
     * @notice Returns whether an account is frozen or not.
     * @param account The address of the account to check.
     * @return True if the account is frozen, false otherwise.
     */
    function isFrozen(address account) external view returns (bool);
}

// SPDX-License-Identifier: GPL-3.0

pragma solidity >=0.8.20 <0.9.0;

import { ERC3009Upgradeable } from "./ERC3009Upgradeable.sol";

import { IERC20 } from "./interfaces/IERC20.sol";
import { IERC20Extended } from "./interfaces/IERC20Extended.sol";

abstract contract ERC20ExtendedUpgradeableStorageLayout {
    /// @custom:storage-location erc7201:M0.storage.ERC20Extended
    struct ERC20ExtendedStorageStruct {
        mapping(address account => mapping(address spender => uint256 allowance)) allowance;
        uint8 decimals;
        string symbol;
    }

    // keccak256(abi.encode(uint256(keccak256("M0.storage.ERC20Extended")) - 1)) & ~bytes32(uint256(0xff))
    bytes32 private constant _ERC20_EXTENDED_STORAGE_LOCATION =
        0xcbbe23efb65c1eaba394256c463812c20abdb5376e247eba1d0e1e92054da100;

    function _getERC20ExtendedStorageLocation() internal pure returns (ERC20ExtendedStorageStruct storage $) {
        assembly {
            $.slot := _ERC20_EXTENDED_STORAGE_LOCATION
        }
    }
}

/**
 * @title  An upgradeable ERC20 token extended with EIP-2612 permits for signed approvals
 *         (via EIP-712 and with EIP-1271 and EIP-5267 compatibility).
 * @author M0 Labs
 */
abstract contract ERC20ExtendedUpgradeable is
    ERC20ExtendedUpgradeableStorageLayout,
    ERC3009Upgradeable,
    IERC20Extended
{
    /* ============ Variables ============ */

    /**
     * @inheritdoc IERC20Extended
     * @dev Keeping this constant, despite `permit` parameter name differences, to ensure max EIP-2612 compatibility.
     *      keccak256("Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)")
     */
    bytes32 public constant PERMIT_TYPEHASH = 0x6e71edae12b1b97f4d1f60370fef10105fa2faae0126114a169c64845d6126c9;

    /* ============ Initializer ============ */

    function __ERC20ExtendedUpgradeable_init(
        string memory name_,
        string memory symbol_,
        uint8 decimals_
    ) internal onlyInitializing {
        __ERC3009Upgradeable_init(name_);

        ERC20ExtendedStorageStruct storage $ = _getERC20ExtendedStorageLocation();

        $.decimals = decimals_;
        $.symbol = symbol_;
    }

    /* ============ Interactive Functions ============ */

    /// @inheritdoc IERC20
    function approve(address spender_, uint256 amount_) external returns (bool) {
        _approve(msg.sender, spender_, amount_);
        return true;
    }

    /// @inheritdoc IERC20Extended
    function permit(
        address owner_,
        address spender_,
        uint256 value_,
        uint256 deadline_,
        uint8 v_,
        bytes32 r_,
        bytes32 s_
    ) external {
        _revertIfInvalidSignature(owner_, _permitAndGetDigest(owner_, spender_, value_, deadline_), v_, r_, s_);
    }

    /// @inheritdoc IERC20Extended
    function permit(
        address owner_,
        address spender_,
        uint256 value_,
        uint256 deadline_,
        bytes memory signature_
    ) external {
        _revertIfInvalidSignature(owner_, _permitAndGetDigest(owner_, spender_, value_, deadline_), signature_);
    }

    /// @inheritdoc IERC20
    function transfer(address recipient_, uint256 amount_) external returns (bool) {
        _transfer(msg.sender, recipient_, amount_);
        return true;
    }

    /// @inheritdoc IERC20
    function transferFrom(address sender_, address recipient_, uint256 amount_) external returns (bool) {
        ERC20ExtendedStorageStruct storage $ = _getERC20ExtendedStorageLocation();
        uint256 spenderAllowance_ = $.allowance[sender_][msg.sender]; // Cache `spenderAllowance_` to stack.

        if (spenderAllowance_ != type(uint256).max) {
            if (spenderAllowance_ < amount_) revert InsufficientAllowance(msg.sender, spenderAllowance_, amount_);

            unchecked {
                _setAllowance($, sender_, msg.sender, spenderAllowance_ - amount_);
            }
        }

        _transfer(sender_, recipient_, amount_);

        return true;
    }

    /* ============ View/Pure Functions ============ */

    /// @inheritdoc IERC20
    function allowance(address account, address spender) public view returns (uint256) {
        return _getERC20ExtendedStorageLocation().allowance[account][spender];
    }

    /// @inheritdoc IERC20
    function decimals() external view virtual returns (uint8) {
        return _getERC20ExtendedStorageLocation().decimals;
    }

    /// @inheritdoc IERC20
    function name() external view virtual returns (string memory) {
        return _getERC712ExtendedStorageLocation().name;
    }

    /// @inheritdoc IERC20
    function symbol() external view virtual returns (string memory) {
        return _getERC20ExtendedStorageLocation().symbol;
    }

    /* ============ Internal Interactive Functions ============ */

    /**
     * @dev Approve `spender_` to spend `amount_` of tokens from `account_`.
     * @param  account_ The address approving the allowance.
     * @param  spender_ The address approved to spend the tokens.
     * @param  amount_  The amount of tokens being approved for spending.
     */
    function _approve(address account_, address spender_, uint256 amount_) internal virtual {
        _setAllowance(_getERC20ExtendedStorageLocation(), account_, spender_, amount_);
        emit Approval(account_, spender_, amount_);
    }

    /**
     * @dev Set the `amount_` of tokens `spender_` is allowed to spend from `account_`.
     * @param $         ERC20Extended storage location.
     * @param  account_ The address for which the allowance is set.
     * @param  spender_ The address allowed to spend the tokens.
     * @param  amount_  The amount of tokens being allowed for spending.
     */
    function _setAllowance(
        ERC20ExtendedStorageStruct storage $,
        address account_,
        address spender_,
        uint256 amount_
    ) internal virtual {
        $.allowance[account_][spender_] = amount_;
    }

    /**
     * @dev    Performs the approval based on the permit info, validates the deadline, and returns the digest.
     * @param  owner_    The address of the account approving the allowance.
     * @param  spender_  The address of the account being allowed to spend the tokens.
     * @param  amount_   The amount of tokens being approved for spending.
     * @param  deadline_ The deadline by which the signature must be used.
     * @return digest_   The EIP-712 digest of the permit.
     */
    function _permitAndGetDigest(
        address owner_,
        address spender_,
        uint256 amount_,
        uint256 deadline_
    ) internal virtual returns (bytes32) {
        _revertIfExpired(deadline_);

        _approve(owner_, spender_, amount_);

        unchecked {
            // Nonce realistically cannot overflow.
            return
                _getDigest(
                    keccak256(
                        abi.encode(
                            PERMIT_TYPEHASH,
                            owner_,
                            spender_,
                            amount_,
                            _getStatefulERC712ExtendedStorageLocation().nonces[owner_]++,
                            deadline_
                        )
                    )
                );
        }
    }
}

// SPDX-License-Identifier: BUSL-1.1

pragma solidity 0.8.26;

/**
 * @title  Subset of M Token interface required for source contracts.
 * @author M0 Labs
 */
interface IMTokenLike {
    /* ============ Custom Errors ============ */

    /// @notice Emitted when calling `stopEarning` for an account approved as earner by TTG.
    error IsApprovedEarner();

    /// @notice Emitted when calling `startEarning` for an account not approved as earner by TTG.
    error NotApprovedEarner();

    /* ============ Interactive Functions ============ */

    /**
     * @notice Allows a calling account to approve `spender` to spend up to `amount` of its token balance.
     * @dev    MUST emit an `Approval` event.
     * @param  spender The address of the account being allowed to spend up to the allowed amount.
     * @param  amount  The amount of the allowance being approved.
     * @return Whether or not the approval was successful.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @notice Approves `spender` to spend up to `amount` of the token balance of `owner`, via a signature.
     * @param  owner    The address of the account who's token balance is being approved to be spent by `spender`.
     * @param  spender  The address of an account allowed to spend on behalf of `owner`.
     * @param  value    The amount of the allowance being approved.
     * @param  deadline The last timestamp where the signature is still valid.
     * @param  v        An ECDSA secp256k1 signature parameter (EIP-2612 via EIP-712).
     * @param  r        An ECDSA secp256k1 signature parameter (EIP-2612 via EIP-712).
     * @param  s        An ECDSA secp256k1 signature parameter (EIP-2612 via EIP-712).
     */
    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;

    /**
     * @notice Approves `spender` to spend up to `amount` of the token balance of `owner`, via a signature.
     * @param  owner     The address of the account who's token balance is being approved to be spent by `spender`.
     * @param  spender   The address of an account allowed to spend on behalf of `owner`.
     * @param  value     The amount of the allowance being approved.
     * @param  deadline  The last timestamp where the signature is still valid.
     * @param  signature An arbitrary signature (EIP-712).
     */
    function permit(address owner, address spender, uint256 value, uint256 deadline, bytes memory signature) external;

    /**
     * @notice Allows a calling account to transfer `amount` tokens to `recipient`.
     * @param  recipient The address of the recipient who's token balance will be incremented.
     * @param  amount    The amount of tokens being transferred.
     * @return success   Whether or not the transfer was successful.
     */
    function transfer(address recipient, uint256 amount) external returns (bool);

    /**
     * @notice Allows a calling account to transfer `amount` tokens from `sender`, with allowance, to a `recipient`.
     * @param  sender    The address of the sender who's token balance will be decremented.
     * @param  recipient The address of the recipient who's token balance will be incremented.
     * @param  amount    The amount of tokens being transferred.
     * @return success   Whether or not the transfer was successful.
     */
    function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);

    /// @notice Starts earning for caller if allowed by the Registrar.
    function startEarning() external;

    /**
     * @notice Stops earning for `account`.
     * @dev    MUST revert if `account` is an approved earner in TTG Registrar.
     * @param  account The account to stop earning for.
     */
    function stopEarning(address account) external;

    /* ============ View/Pure Functions ============ */

    /**
     * @notice Checks if account is an earner.
     * @param  account The account to check.
     * @return earning True if account is an earner, false otherwise.
     */
    function isEarning(address account) external view returns (bool);

    /**
     * @notice Returns the token balance of `account`.
     * @param  account The address of some account.
     * @return balance The token balance of `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /// @notice The current index that would be written to storage if `updateIndex` is called.
    function currentIndex() external view returns (uint128);

    /// @notice The current value of earner rate in basis points.
    function earnerRate() external view returns (uint32);

    /// @notice Returns the EIP712 domain separator used in the encoding of a signed digest.
    function DOMAIN_SEPARATOR() external view returns (bytes32);

    /// @notice Returns the EIP712 typehash used in the encoding of the digest for the permit function.
    function PERMIT_TYPEHASH() external view returns (bytes32);
}

// SPDX-License-Identifier: BUSL-1.1

pragma solidity 0.8.26;

import { IERC20Extended } from "../../lib/common/src/interfaces/IERC20Extended.sol";

/**
 * @title  M Extension interface extending Extended ERC20,
 *         includes additional enable/disable earnings and index logic.
 * @author M0 Labs
 */
interface IMExtension is IERC20Extended {
    /* ============ Events ============ */

    /**
     * @notice Emitted when M extension earning is enabled.
     * @param  index The index at the moment earning is enabled.
     */
    event EarningEnabled(uint128 index);

    /**
     * @notice Emitted when M extension earning is disabled.
     * @param  index The index at the moment earning is disabled.
     */
    event EarningDisabled(uint128 index);

    /* ============ Custom Errors ============ */

    /// @notice Emitted when performing an operation that is not allowed when earning is disabled.
    error EarningIsDisabled();

    /// @notice Emitted when performing an operation that is not allowed when earning is enabled.
    error EarningIsEnabled();

    /**
     * @notice Emitted when there is insufficient balance to decrement from `account`.
     * @param  account The account with insufficient balance.
     * @param  balance The balance of the account.
     * @param  amount  The amount to decrement.
     */
    error InsufficientBalance(address account, uint256 balance, uint256 amount);

    /// @notice Emitted in constructor if M Token is 0x0.
    error ZeroMToken();

    /// @notice Emitted in constructor if Swap Facility is 0x0.
    error ZeroSwapFacility();

    /// @notice Emitted in `wrap` and `unwrap` functions if the caller is not the Swap Facility.
    error NotSwapFacility();

    /* ============ Interactive Functions ============ */

    /**
     * @notice Enables earning of extension token if allowed by the TTG Registrar and if it has never been done.
     * @dev SHOULD be virtual to allow extensions to override it.
     */
    function enableEarning() external;

    /**
     * @notice Disables earning of extension token if disallowed by the TTG Registrar and if it has never been done.
     * @dev SHOULD be virtual to allow extensions to override it.
     */
    function disableEarning() external;

    /**
     * @notice Wraps `amount` M from the caller into extension token for `recipient`.
     * @dev    Can only be called by the SwapFacility.
     * @param  recipient The account receiving the minted M extension token.
     * @param  amount    The amount of M extension token minted.
     */
    function wrap(address recipient, uint256 amount) external;

    /**
     * @notice Unwraps `amount` extension token from the caller into M for `recipient`.
     * @dev    Can only be called by the SwapFacility.
     * @param  recipient The account receiving the withdrawn M,
     *         it will always be the SwapFacility (keep `recipient` for backward compatibility).
     * @param  amount    The amount of M extension token burned.
     */
    function unwrap(address recipient, uint256 amount) external;

    /* ============ View/Pure Functions ============ */

    /// @notice The address of the M Token contract.
    function mToken() external view returns (address);

    /// @notice The address of the SwapFacility contract.
    function swapFacility() external view returns (address);

    /**
     * @notice Whether M extension earning is enabled.
     * @dev SHOULD be virtual to allow extensions to override it.
     */
    function isEarningEnabled() external view returns (bool);

    /**
     * @notice Returns the current index for M extension earnings.
     * @dev SHOULD be virtual to allow extensions to override it.
     */
    function currentIndex() external view returns (uint128);
}

// SPDX-License-Identifier: BUSL-1.1

pragma solidity 0.8.26;

/**
 * @title  Swap Facility interface.
 * @author M0 Labs
 */
interface ISwapFacility {
    /* ============ Events ============ */

    /**
     * @notice Emitted when $M Extension is swapped for another $M Extension.
     * @param extensionIn  The address of the input $M Extension.
     * @param extensionOut The address of the output $M Extension.
     * @param amount       The amount swapped.
     * @param recipient    The address to receive the output $M Extension token.
     */
    event Swapped(address indexed extensionIn, address indexed extensionOut, uint256 amount, address indexed recipient);

    /**
     * @notice Emitted when $M token is swapped for $M Extension.
     * @param extensionOut The address of the output $M Extension.
     * @param amount       The amount swapped.
     * @param recipient    The address to receive the output $M Extension token.
     */
    event SwappedInM(address indexed extensionOut, uint256 amount, address indexed recipient);

    /**
     * @notice Emitted when $M Extension is swapped for $M token.
     * @param extensionIn  The address of the input $M Extension.
     * @param amount       The amount swapped.
     * @param recipient    The address to receive the $M token.
     */
    event SwappedOutM(address indexed extensionIn, uint256 amount, address indexed recipient);

    /**
     * @notice Emitted when an $M Extension is set as permissioned or not.
     * @param  extension The address of an $M Extension.
     * @param  allowed   True if the extension is allowed, false otherwise.
     */
    event PermissionedExtensionSet(address indexed extension, bool allowed);

    /**
     * @notice Emitted when a `swapper` is allowed or not to swap the permissioned `extension` from/to M.
     * @param  extension The address of an $M extension.
     * @param  swapper   The address of the swapper.
     * @param  allowed   True if the swapper is allowed, false otherwise.
     */
    event PermissionedMSwapperSet(address indexed extension, address indexed swapper, bool allowed);

    /* ============ Custom Errors ============ */

    /// @notice Thrown in the constructor if $M Token is 0x0.
    error ZeroMToken();

    /// @notice Thrown in the constructor if Registrar is 0x0.
    error ZeroRegistrar();

    /// @notice Thrown in `setPermissionedMSwapper()` if the $M extension is 0x0.
    error ZeroExtension();

    /// @notice Thrown in `setPermissionedMSwapper()` if the swapper is 0x0.
    error ZeroSwapper();

    /// @notice Thrown in `swap` and `swapM` functions if the extension is not TTG approved earner.
    error NotApprovedExtension(address extension);

    /// @notice Thrown in `swapInM` and `swapOutM` functions if `swapper` is not approved to swap a permissioned `extension`.
    error NotApprovedPermissionedSwapper(address extension, address swapper);

    /// @notice Thrown in `swapInM` and `swapOutM` functions if `swapper` is not approved to swap the `extension`.
    error NotApprovedSwapper(address extension, address swapper);

    /// @notice Thrown in `swap` function if the extension is permissioned.
    error PermissionedExtension(address extension);

    /* ============ Interactive Functions ============ */

    /**
     * @notice Swaps one $M Extension to another.
     * @param  extensionIn  The address of the $M Extension to swap from.
     * @param  extensionOut The address of the $M Extension to swap to.
     * @param  amount       The amount to swap.
     * @param  recipient    The address to receive the swapped $M Extension tokens.
     */
    function swap(address extensionIn, address extensionOut, uint256 amount, address recipient) external;

    /**
     * @notice Swaps one $M Extension to another using permit.
     * @param  extensionIn  The address of the $M Extension to swap from.
     * @param  extensionOut The address of the $M Extension to swap to.
     * @param  amount       The amount to swap.
     * @param  recipient    The address to receive the swapped $M Extension tokens.
     * @param  deadline     The last timestamp where the signature is still valid.
     * @param  v            An ECDSA secp256k1 signature parameter (EIP-2612 via EIP-712).
     * @param  r            An ECDSA secp256k1 signature parameter (EIP-2612 via EIP-712).
     * @param  s            An ECDSA secp256k1 signature parameter (EIP-2612 via EIP-712).
     */
    function swapWithPermit(
        address extensionIn,
        address extensionOut,
        uint256 amount,
        address recipient,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;

    /**
     * @notice Swaps one $M Extension to another using permit.
     * @param  extensionIn  The address of the $M Extension to swap from.
     * @param  extensionOut The address of the $M Extension to swap to.
     * @param  amount       The amount to swap.
     * @param  recipient    The address to receive the swapped $M Extension tokens.
     * @param  deadline     The last timestamp where the signature is still valid.
     * @param  signature    An arbitrary signature (EIP-712).
     */
    function swapWithPermit(
        address extensionIn,
        address extensionOut,
        uint256 amount,
        address recipient,
        uint256 deadline,
        bytes calldata signature
    ) external;

    /**
     * @notice Swaps $M token to $M Extension.
     * @param  extensionOut The address of the M Extension to swap to.
     * @param  amount       The amount of $M token to swap.
     * @param  recipient    The address to receive the swapped $M Extension tokens.
     */
    function swapInM(address extensionOut, uint256 amount, address recipient) external;

    /**
     * @notice Swaps $M token to $M Extension using permit.
     * @param  extensionOut The address of the M Extension to swap to.
     * @param  amount       The amount of $M token to swap.
     * @param  recipient    The address to receive the swapped $M Extension tokens.
     * @param  deadline     The last timestamp where the signature is still valid.
     * @param  v            An ECDSA secp256k1 signature parameter (EIP-2612 via EIP-712).
     * @param  r            An ECDSA secp256k1 signature parameter (EIP-2612 via EIP-712).
     * @param  s            An ECDSA secp256k1 signature parameter (EIP-2612 via EIP-712).
     */
    function swapInMWithPermit(
        address extensionOut,
        uint256 amount,
        address recipient,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;

    /**
     * @notice Swaps $M token to $M Extension using permit.
     * @param  extensionOut The address of the M Extension to swap to.
     * @param  amount       The amount of $M token to swap.
     * @param  recipient    The address to receive the swapped $M Extension tokens.
     * @param  deadline     The last timestamp where the signature is still valid.
     * @param  signature    An arbitrary signature (EIP-712).
     */
    function swapInMWithPermit(
        address extensionOut,
        uint256 amount,
        address recipient,
        uint256 deadline,
        bytes calldata signature
    ) external;

    /**
     * @notice Swaps $M Extension to $M token.
     * @param  extensionIn The address of the $M Extension to swap from.
     * @param  amount      The amount of $M Extension tokens to swap.
     * @param  recipient   The address to receive $M tokens.
     */
    function swapOutM(address extensionIn, uint256 amount, address recipient) external;

    /**
     * @notice Swaps $M Extension to $M token using permit.
     * @param  extensionIn The address of the $M Extension to swap from.
     * @param  amount      The amount of $M Extension tokens to swap.
     * @param  recipient   The address to receive $M tokens.
     * @param  deadline    The last timestamp where the signature is still valid.
     * @param  v           An ECDSA secp256k1 signature parameter (EIP-2612 via EIP-712).
     * @param  r           An ECDSA secp256k1 signature parameter (EIP-2612 via EIP-712).
     * @param  s           An ECDSA secp256k1 signature parameter (EIP-2612 via EIP-712).
     */
    function swapOutMWithPermit(
        address extensionIn,
        uint256 amount,
        address recipient,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;

    /**
     * @notice Swaps $M Extension to $M token using permit.
     * @param  extensionIn The address of the $M Extension to swap from.
     * @param  amount      The amount of $M Extension tokens to swap.
     * @param  recipient   The address to receive $M tokens.
     * @param  deadline    The last timestamp where the signature is still valid.
     * @param  signature   An arbitrary signature (EIP-712).
     */
    function swapOutMWithPermit(
        address extensionIn,
        uint256 amount,
        address recipient,
        uint256 deadline,
        bytes calldata signature
    ) external;

    /**
     * @notice Sets whether the `extension` is permissioned.
     * @dev    MUST only be callable by an address with the `DEFAULT_ADMIN_ROLE` role.
     * @param  extension    The address of an $M Extension.
     * @param  permissioned True if the extension is permissioned, false otherwise.
     */
    function setPermissionedExtension(address extension, bool permissioned) external;

    /**
     * @notice Sets whether `swapper` is allowed to swap the permissioned `extension` from/to M.
     * @dev    MUST only be callable by an address with the `DEFAULT_ADMIN_ROLE` role.
     * @param  extension The address of an extension to set permission for.
     * @param  swapper   The address of the swapper to set permission for.
     * @param  allowed   True if the swapper is allowed, false otherwise.
     */
    function setPermissionedMSwapper(address extension, address swapper, bool allowed) external;

    /* ============ View/Pure Functions ============ */

    /// @notice The address of the $M Token contract.
    function mToken() external view returns (address mToken);

    /// @notice The address of the Registrar.
    function registrar() external view returns (address registrar);

    /**
     * @notice Returns the address that called `swap` or `swapM`
     * @dev    Must be used instead of `msg.sender` in $M Extensions contracts to get the original sender.
     */
    function msgSender() external view returns (address msgSender);

    /**
     * @notice Checks if the extension is permissioned.
     * @param  extension The extension address to check.
     * @return true if allowed, false otherwise.
     */
    function isPermissionedExtension(address extension) external view returns (bool);

    /**
     * @notice Checks if `swapper` is allowed to swap the permissioned extension from/to M.
     * @param  extension The $M extension address.
     * @param  swapper   The swapper address to check.
     * @return true if allowed, false otherwise.
     */
    function isPermissionedMSwapper(address extension, address swapper) external view returns (bool);

    /**
     * @notice Checks if `swapper` is allowed to swap the permissionless (common) extension from/to M.
     * @param  swapper   The swapper address to check.
     * @return true if allowed, false otherwise.
     */
    function isMSwapper(address swapper) external view returns (bool);

    /// @notice The parameter name in the Registrar that defines the earners list.
    function EARNERS_LIST_NAME() external pure returns (bytes32);

    /// @notice The parameter name in the Registrar that defines whether to ignore the earners list.
    function EARNERS_LIST_IGNORED_KEY() external pure returns (bytes32);

    /// @notice Swapper role for permissioned extensions.
    function M_SWAPPER_ROLE() external pure returns (bytes32);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.3.0) (access/IAccessControl.sol)

pragma solidity ^0.8.20;

/**
 * @dev External interface of AccessControl declared to support ERC-165 detection.
 */
interface IAccessControl {
    /**
     * @dev The `account` is missing a role.
     */
    error AccessControlUnauthorizedAccount(address account, bytes32 neededRole);

    /**
     * @dev The caller of a function is not the expected one.
     *
     * NOTE: Don't confuse with {AccessControlUnauthorizedAccount}.
     */
    error AccessControlBadConfirmation();

    /**
     * @dev Emitted when `newAdminRole` is set as ``role``'s admin role, replacing `previousAdminRole`
     *
     * `DEFAULT_ADMIN_ROLE` is the starting admin for all roles, despite
     * {RoleAdminChanged} not being emitted to signal this.
     */
    event RoleAdminChanged(bytes32 indexed role, bytes32 indexed previousAdminRole, bytes32 indexed newAdminRole);

    /**
     * @dev Emitted when `account` is granted `role`.
     *
     * `sender` is the account that originated the contract call. This account bears the admin role (for the granted role).
     * Expected in cases where the role was granted using the internal {AccessControl-_grantRole}.
     */
    event RoleGranted(bytes32 indexed role, address indexed account, address indexed sender);

    /**
     * @dev Emitted when `account` is revoked `role`.
     *
     * `sender` is the account that originated the contract call:
     *   - if using `revokeRole`, it is the admin role bearer
     *   - if using `renounceRole`, it is the role bearer (i.e. `account`)
     */
    event RoleRevoked(bytes32 indexed role, address indexed account, address indexed sender);

    /**
     * @dev Returns `true` if `account` has been granted `role`.
     */
    function hasRole(bytes32 role, address account) external view returns (bool);

    /**
     * @dev Returns the admin role that controls `role`. See {grantRole} and
     * {revokeRole}.
     *
     * To change a role's admin, use {AccessControl-_setRoleAdmin}.
     */
    function getRoleAdmin(bytes32 role) external view returns (bytes32);

    /**
     * @dev Grants `role` to `account`.
     *
     * If `account` had not been already granted `role`, emits a {RoleGranted}
     * event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     */
    function grantRole(bytes32 role, address account) external;

    /**
     * @dev Revokes `role` from `account`.
     *
     * If `account` had been granted `role`, emits a {RoleRevoked} event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     */
    function revokeRole(bytes32 role, address account) external;

    /**
     * @dev Revokes `role` from the calling account.
     *
     * Roles are often managed via {grantRole} and {revokeRole}: this function's
     * purpose is to provide a mechanism for accounts to lose their privileges
     * if they are compromised (such as when a trusted device is misplaced).
     *
     * If the calling account had been granted `role`, emits a {RoleRevoked}
     * event.
     *
     * Requirements:
     *
     * - the caller must be `callerConfirmation`.
     */
    function renounceRole(bytes32 role, address callerConfirmation) external;
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.1.0) (utils/introspection/ERC165.sol)

pragma solidity ^0.8.20;

import {IERC165} from "@openzeppelin/contracts/utils/introspection/IERC165.sol";
import {Initializable} from "../../proxy/utils/Initializable.sol";

/**
 * @dev Implementation of the {IERC165} interface.
 *
 * Contracts that want to implement ERC-165 should inherit from this contract and override {supportsInterface} to check
 * for the additional interface id that will be supported. For example:
 *
 * ```solidity
 * function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
 *     return interfaceId == type(MyInterface).interfaceId || super.supportsInterface(interfaceId);
 * }
 * ```
 */
abstract contract ERC165Upgradeable is Initializable, IERC165 {
    function __ERC165_init() internal onlyInitializing {
    }

    function __ERC165_init_unchained() internal onlyInitializing {
    }
    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual returns (bool) {
        return interfaceId == type(IERC165).interfaceId;
    }
}

// SPDX-License-Identifier: GPL-3.0

pragma solidity >=0.8.20 <0.9.0;

import { Initializable } from "../lib/openzeppelin-contracts-upgradeable/contracts/proxy/utils/Initializable.sol";
import { IERC3009 } from "./interfaces/IERC3009.sol";

import { StatefulERC712Upgradeable } from "./StatefulERC712Upgradeable.sol";

abstract contract ERC3009UpgradeableStorageLayout {
    /// @custom:storage-location erc7201:M0.storage.ERC3009
    struct ERC3009StorageStruct {
        mapping(address authorizer => mapping(bytes32 nonce => bool isNonceUsed)) authorizationState;
    }

    // keccak256(abi.encode(uint256(keccak256("M0.storage.ERC3009")) - 1)) & ~bytes32(uint256(0xff))
    bytes32 private constant _ERC3009_STORAGE_LOCATION =
        0x1116a1d33aa5fb91b2652b3b0fdb63704173742d6dbecaf4256ebe33a4888600;

    function _getERC3009StorageLocation() internal pure returns (ERC3009StorageStruct storage $) {
        assembly {
            $.slot := _ERC3009_STORAGE_LOCATION
        }
    }
}

/**
 * @title  ERC3009 implementation allowing the transfer of fungible assets via a signed authorization.
 * @author M0 Labs
 * @dev    Inherits from ERC712ExtendedUpgradeable and StatefulERC712Upgradeable.
 */
abstract contract ERC3009Upgradeable is IERC3009, ERC3009UpgradeableStorageLayout, StatefulERC712Upgradeable {
    /* ============ Variables ============ */

    // solhint-disable-next-line max-line-length
    /// @dev        keccak256("TransferWithAuthorization(address from,address to,uint256 value,uint256 validAfter,uint256 validBefore,bytes32 nonce)")
    /// @inheritdoc IERC3009
    bytes32 public constant TRANSFER_WITH_AUTHORIZATION_TYPEHASH =
        0x7c7c6cdb67a18743f49ec6fa9b35f50d52ed05cbed4cc592e13b44501c1a2267;

    // solhint-disable-next-line max-line-length
    /// @dev        keccak256("ReceiveWithAuthorization(address from,address to,uint256 value,uint256 validAfter,uint256 validBefore,bytes32 nonce)")
    /// @inheritdoc IERC3009
    bytes32 public constant RECEIVE_WITH_AUTHORIZATION_TYPEHASH =
        0xd099cc98ef71107a616c4f0f941f04c322d8e254fe26b3c6668db87aae413de8;

    /**
     * @inheritdoc IERC3009
     * @dev        keccak256("CancelAuthorization(address authorizer,bytes32 nonce)")
     */
    bytes32 public constant CANCEL_AUTHORIZATION_TYPEHASH =
        0x158b0a9edf7a828aad02f63cd515c68ef2f50ba807396f6d12842833a1597429;

    /* ============ Initializer ============ */

    /**
     * @notice Initializes the ERC3009Upgradeable contract.
     * @param  name_ The name of the contract.
     */
    function __ERC3009Upgradeable_init(string memory name_) internal onlyInitializing {
        __StatefulERC712ExtendedUpgradeable_init(name_);
    }

    /* ============ Interactive Functions ============ */

    /// @inheritdoc IERC3009
    function transferWithAuthorization(
        address from_,
        address to_,
        uint256 value_,
        uint256 validAfter_,
        uint256 validBefore_,
        bytes32 nonce_,
        bytes memory signature_
    ) external {
        _revertIfInvalidSignature(
            from_,
            _getTransferWithAuthorizationDigest(from_, to_, value_, validAfter_, validBefore_, nonce_),
            signature_
        );

        _transferWithAuthorization(from_, to_, value_, validAfter_, validBefore_, nonce_);
    }

    /// @inheritdoc IERC3009
    function transferWithAuthorization(
        address from_,
        address to_,
        uint256 value_,
        uint256 validAfter_,
        uint256 validBefore_,
        bytes32 nonce_,
        bytes32 r_,
        bytes32 vs_
    ) external {
        _revertIfInvalidSignature(
            from_,
            _getTransferWithAuthorizationDigest(from_, to_, value_, validAfter_, validBefore_, nonce_),
            r_,
            vs_
        );

        _transferWithAuthorization(from_, to_, value_, validAfter_, validBefore_, nonce_);
    }

    /// @inheritdoc IERC3009
    function transferWithAuthorization(
        address from_,
        address to_,
        uint256 value_,
        uint256 validAfter_,
        uint256 validBefore_,
        bytes32 nonce_,
        uint8 v_,
        bytes32 r_,
        bytes32 s_
    ) external {
        _revertIfInvalidSignature(
            from_,
            _getTransferWithAuthorizationDigest(from_, to_, value_, validAfter_, validBefore_, nonce_),
            v_,
            r_,
            s_
        );

        _transferWithAuthorization(from_, to_, value_, validAfter_, validBefore_, nonce_);
    }

    /// @inheritdoc IERC3009
    function receiveWithAuthorization(
        address from_,
        address to_,
        uint256 value_,
        uint256 validAfter_,
        uint256 validBefore_,
        bytes32 nonce_,
        bytes memory signature_
    ) external {
        _revertIfInvalidSignature(
            from_,
            _getReceiveWithAuthorizationDigest(from_, to_, value_, validAfter_, validBefore_, nonce_),
            signature_
        );

        _receiveWithAuthorization(from_, to_, value_, validAfter_, validBefore_, nonce_);
    }

    /// @inheritdoc IERC3009
    function receiveWithAuthorization(
        address from_,
        address to_,
        uint256 value_,
        uint256 validAfter_,
        uint256 validBefore_,
        bytes32 nonce_,
        bytes32 r_,
        bytes32 vs_
    ) external {
        _revertIfInvalidSignature(
            from_,
            _getReceiveWithAuthorizationDigest(from_, to_, value_, validAfter_, validBefore_, nonce_),
            r_,
            vs_
        );

        _receiveWithAuthorization(from_, to_, value_, validAfter_, validBefore_, nonce_);
    }

    /// @inheritdoc IERC3009
    function receiveWithAuthorization(
        address from_,
        address to_,
        uint256 value_,
        uint256 validAfter_,
        uint256 validBefore_,
        bytes32 nonce_,
        uint8 v_,
        bytes32 r_,
        bytes32 s_
    ) external {
        _revertIfInvalidSignature(
            from_,
            _getReceiveWithAuthorizationDigest(from_, to_, value_, validAfter_, validBefore_, nonce_),
            v_,
            r_,
            s_
        );

        _receiveWithAuthorization(from_, to_, value_, validAfter_, validBefore_, nonce_);
    }

    /// @inheritdoc IERC3009
    function cancelAuthorization(address authorizer_, bytes32 nonce_, bytes memory signature_) external {
        _revertIfInvalidSignature(authorizer_, _getCancelAuthorizationDigest(authorizer_, nonce_), signature_);
        _cancelAuthorization(authorizer_, nonce_);
    }

    /// @inheritdoc IERC3009
    function cancelAuthorization(address authorizer_, bytes32 nonce_, bytes32 r_, bytes32 vs_) external {
        _revertIfInvalidSignature(authorizer_, _getCancelAuthorizationDigest(authorizer_, nonce_), r_, vs_);
        _cancelAuthorization(authorizer_, nonce_);
    }

    /// @inheritdoc IERC3009
    function cancelAuthorization(address authorizer_, bytes32 nonce_, uint8 v_, bytes32 r_, bytes32 s_) external {
        _revertIfInvalidSignature(authorizer_, _getCancelAuthorizationDigest(authorizer_, nonce_), v_, r_, s_);
        _cancelAuthorization(authorizer_, nonce_);
    }

    /* ============ View/Pure Functions ============ */

    /// @inheritdoc IERC3009
    function authorizationState(address authorizer, bytes32 nonce) public view returns (bool) {
        return _getERC3009StorageLocation().authorizationState[authorizer][nonce];
    }

    /* ============ Internal Interactive Functions ============ */

    /**
     * @dev   Common transfer function used by `transferWithAuthorization` and `_receiveWithAuthorization`.
     * @param from_        Payer's address (Authorizer).
     * @param to_          Payee's address.
     * @param value_       Amount to be transferred.
     * @param validAfter_  The time after which this is valid (unix time).
     * @param validBefore_ The time before which this is valid (unix time).
     * @param nonce_       Unique nonce.
     */
    function _transferWithAuthorization(
        address from_,
        address to_,
        uint256 value_,
        uint256 validAfter_,
        uint256 validBefore_,
        bytes32 nonce_
    ) internal {
        if (block.timestamp <= validAfter_) revert AuthorizationNotYetValid(block.timestamp, validAfter_);
        if (block.timestamp >= validBefore_) revert AuthorizationExpired(block.timestamp, validBefore_);

        _revertIfAuthorizationAlreadyUsed(from_, nonce_);

        _getERC3009StorageLocation().authorizationState[from_][nonce_] = true;

        emit AuthorizationUsed(from_, nonce_);

        _transfer(from_, to_, value_);
    }

    /**
     * @dev   Common receive function used by `receiveWithAuthorization`.
     * @param from_        Payer's address (Authorizer).
     * @param to_          Payee's address.
     * @param value_       Amount to be transferred.
     * @param validAfter_  The time after which this is valid (unix time).
     * @param validBefore_ The time before which this is valid (unix time).
     * @param nonce_       Unique nonce.
     */
    function _receiveWithAuthorization(
        address from_,
        address to_,
        uint256 value_,
        uint256 validAfter_,
        uint256 validBefore_,
        bytes32 nonce_
    ) internal {
        if (msg.sender != to_) revert CallerMustBePayee(msg.sender, to_);

        _transferWithAuthorization(from_, to_, value_, validAfter_, validBefore_, nonce_);
    }

    /**
     * @dev   Common cancel function used by `cancelAuthorization`.
     * @param authorizer_ Authorizer's address.
     * @param nonce_      Nonce of the authorization.
     */
    function _cancelAuthorization(address authorizer_, bytes32 nonce_) internal {
        _revertIfAuthorizationAlreadyUsed(authorizer_, nonce_);

        _getERC3009StorageLocation().authorizationState[authorizer_][nonce_] = true;

        emit AuthorizationCanceled(authorizer_, nonce_);
    }

    /**
     * @dev   Internal ERC20 transfer function that needs to be implemented by the inheriting contract.
     * @param sender_    The sender's address.
     * @param recipient_ The recipient's address.
     * @param amount_    The amount to be transferred.
     */
    function _transfer(address sender_, address recipient_, uint256 amount_) internal virtual;

    /* ============ Internal View/Pure Functions ============ */

    /**
     * @dev    Returns the internal EIP-712 digest of a transferWithAuthorization call.
     * @param  from_        Payer's address (Authorizer).
     * @param  to_          Payee's address.
     * @param  value_       Amount to be transferred.
     * @param  validAfter_  The time after which this is valid (unix time).
     * @param  validBefore_ The time before which this is valid (unix time).
     * @param  nonce_       Unique nonce.
     * @return The internal EIP-712 digest.
     */
    function _getTransferWithAuthorizationDigest(
        address from_,
        address to_,
        uint256 value_,
        uint256 validAfter_,
        uint256 validBefore_,
        bytes32 nonce_
    ) internal view returns (bytes32) {
        return
            _getDigest(
                keccak256(
                    abi.encode(
                        TRANSFER_WITH_AUTHORIZATION_TYPEHASH,
                        from_,
                        to_,
                        value_,
                        validAfter_,
                        validBefore_,
                        nonce_
                    )
                )
            );
    }

    /**
     * @dev    Returns the internal EIP-712 digest of a receiveWithAuthorization call.
     * @param  from_        Payer's address (Authorizer).
     * @param  to_          Payee's address.
     * @param  value_       Amount to be transferred.
     * @param  validAfter_  The time after which this is valid (unix time).
     * @param  validBefore_ The time before which this is valid (unix time).
     * @param  nonce_       Unique nonce.
     * @return The internal EIP-712 digest.
     */
    function _getReceiveWithAuthorizationDigest(
        address from_,
        address to_,
        uint256 value_,
        uint256 validAfter_,
        uint256 validBefore_,
        bytes32 nonce_
    ) internal view returns (bytes32) {
        return
            _getDigest(
                keccak256(
                    abi.encode(
                        RECEIVE_WITH_AUTHORIZATION_TYPEHASH,
                        from_,
                        to_,
                        value_,
                        validAfter_,
                        validBefore_,
                        nonce_
                    )
                )
            );
    }

    /**
     * @dev    Returns the internal EIP-712 digest of a cancelAuthorization call.
     * @param  authorizer_ Authorizer's address.
     * @param  nonce_      Nonce of the authorization.
     * @return The internal EIP-712 digest.
     */
    function _getCancelAuthorizationDigest(address authorizer_, bytes32 nonce_) internal view returns (bytes32) {
        return _getDigest(keccak256(abi.encode(CANCEL_AUTHORIZATION_TYPEHASH, authorizer_, nonce_)));
    }

    /**
     * @dev   Reverts if the authorization is already used.
     * @param authorizer_ The authorizer's address.
     * @param nonce_      The nonce of the authorization.
     */
    function _revertIfAuthorizationAlreadyUsed(address authorizer_, bytes32 nonce_) internal view {
        if (authorizationState(authorizer_, nonce_)) revert AuthorizationAlreadyUsed(authorizer_, nonce_);
    }
}

// SPDX-License-Identifier: GPL-3.0

pragma solidity >=0.8.20 <0.9.0;

import { IERC20 } from "./IERC20.sol";
import { IERC3009 } from "./IERC3009.sol";

/**
 * @title  An ERC20 token extended with EIP-2612 permits for signed approvals (via EIP-712
 *         and with EIP-1271 compatibility), and extended with EIP-3009 transfer with authorization (via EIP-712).
 * @author M^0 Labs
 * @dev    The additional interface as defined by EIP-2612: https://eips.ethereum.org/EIPS/eip-2612
 */
interface IERC20Extended is IERC20, IERC3009 {
    /* ============ Custom Errors ============ */

    /**
     * @notice Revert message when spender's allowance is not sufficient.
     * @param  spender    Address that may be allowed to operate on tokens without being their owner.
     * @param  allowance  Amount of tokens a `spender` is allowed to operate with.
     * @param  needed     Minimum amount required to perform a transfer.
     */
    error InsufficientAllowance(address spender, uint256 allowance, uint256 needed);

    /**
     * @notice Revert message emitted when the transferred amount is insufficient.
     * @param  amount Amount transferred.
     */
    error InsufficientAmount(uint256 amount);

    /**
     * @notice Revert message emitted when the recipient of a token is invalid.
     * @param  recipient Address of the invalid recipient.
     */
    error InvalidRecipient(address recipient);

    /* ============ Interactive Functions ============ */

    /**
     * @notice Approves `spender` to spend up to `amount` of the token balance of `owner`, via a signature.
     * @param  owner    The address of the account who's token balance is being approved to be spent by `spender`.
     * @param  spender  The address of an account allowed to spend on behalf of `owner`.
     * @param  value    The amount of the allowance being approved.
     * @param  deadline The last timestamp where the signature is still valid.
     * @param  v        An ECDSA secp256k1 signature parameter (EIP-2612 via EIP-712).
     * @param  r        An ECDSA secp256k1 signature parameter (EIP-2612 via EIP-712).
     * @param  s        An ECDSA secp256k1 signature parameter (EIP-2612 via EIP-712).
     */
    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;

    /**
     * @notice Approves `spender` to spend up to `amount` of the token balance of `owner`, via a signature.
     * @param  owner     The address of the account who's token balance is being approved to be spent by `spender`.
     * @param  spender   The address of an account allowed to spend on behalf of `owner`.
     * @param  value     The amount of the allowance being approved.
     * @param  deadline  The last timestamp where the signature is still valid.
     * @param  signature An arbitrary signature (EIP-712).
     */
    function permit(address owner, address spender, uint256 value, uint256 deadline, bytes memory signature) external;

    /* ============ View/Pure Functions ============ */

    /// @notice Returns the EIP712 typehash used in the encoding of the digest for the permit function.
    function PERMIT_TYPEHASH() external view returns (bytes32);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.1.0) (utils/introspection/IERC165.sol)

pragma solidity ^0.8.20;

/**
 * @dev Interface of the ERC-165 standard, as defined in the
 * https://eips.ethereum.org/EIPS/eip-165[ERC].
 *
 * Implementers can declare support of contract interfaces, which can then be
 * queried by others ({ERC165Checker}).
 *
 * For an implementation, see {ERC165}.
 */
interface IERC165 {
    /**
     * @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[ERC 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);
}

// SPDX-License-Identifier: GPL-3.0

pragma solidity >=0.8.20 <0.9.0;

import { IStatefulERC712 } from "./IStatefulERC712.sol";

/**
 * @title  Transfer via signed authorization following EIP-3009 standard.
 * @author M^0 Labs
 * @dev    The interface as defined by EIP-3009: https://eips.ethereum.org/EIPS/eip-3009
 */
interface IERC3009 is IStatefulERC712 {
    /* ============ Events ============ */

    /**
     * @notice Emitted when an authorization has been canceled.
     * @param  authorizer Authorizer's address.
     * @param  nonce      Nonce of the canceled authorization.
     */
    event AuthorizationCanceled(address indexed authorizer, bytes32 indexed nonce);

    /**
     * @notice Emitted when an authorization has been used.
     * @param  authorizer Authorizer's address.
     * @param  nonce      Nonce of the used authorization.
     */
    event AuthorizationUsed(address indexed authorizer, bytes32 indexed nonce);

    /* ============ Custom Errors ============ */

    /**
     * @notice Emitted when an authorization has already been used.
     * @param  authorizer Authorizer's address.
     * @param  nonce      Nonce of the used authorization.
     */
    error AuthorizationAlreadyUsed(address authorizer, bytes32 nonce);

    /**
     * @notice Emitted when an authorization is expired.
     * @param  timestamp   Timestamp at which the transaction was submitted.
     * @param  validBefore Timestamp before which the authorization would have been valid.
     */
    error AuthorizationExpired(uint256 timestamp, uint256 validBefore);

    /**
     * @notice Emitted when an authorization is not yet valid.
     * @param  timestamp  Timestamp at which the transaction was submitted.
     * @param  validAfter Timestamp after which the authorization will be valid.
     */
    error AuthorizationNotYetValid(uint256 timestamp, uint256 validAfter);

    /**
     * @notice Emitted when the caller of `receiveWithAuthorization` is not the payee.
     * @param  caller Caller's address.
     * @param  payee  Payee's address.
     */
    error CallerMustBePayee(address caller, address payee);

    /* ============ Interactive Functions ============ */

    /**
     * @notice Execute a transfer with a signed authorization.
     * @param  from        Payer's address (Authorizer).
     * @param  to          Payee's address.
     * @param  value       Amount to be transferred.
     * @param  validAfter  The time after which this is valid (unix time).
     * @param  validBefore The time before which this is valid (unix time).
     * @param  nonce       Unique nonce.
     * @param  signature   A byte array ECDSA/secp256k1 signature (encoded r, s, v).
     */
    function transferWithAuthorization(
        address from,
        address to,
        uint256 value,
        uint256 validAfter,
        uint256 validBefore,
        bytes32 nonce,
        bytes memory signature
    ) external;

    /**
     * @notice Execute a transfer with a signed authorization.
     * @param  from        Payer's address (Authorizer).
     * @param  to          Payee's address.
     * @param  value       Amount to be transferred.
     * @param  validAfter  The time after which this is valid (unix time).
     * @param  validBefore The time before which this is valid (unix time).
     * @param  nonce       Unique nonce.
     * @param  r           An ECDSA/secp256k1 signature parameter.
     * @param  vs          An ECDSA/secp256k1 short signature parameter.
     */
    function transferWithAuthorization(
        address from,
        address to,
        uint256 value,
        uint256 validAfter,
        uint256 validBefore,
        bytes32 nonce,
        bytes32 r,
        bytes32 vs
    ) external;

    /**
     * @notice Execute a transfer with a signed authorization.
     * @param  from        Payer's address (Authorizer).
     * @param  to          Payee's address.
     * @param  value       Amount to be transferred.
     * @param  validAfter  The time after which this is valid (unix time).
     * @param  validBefore The time before which this is valid (unix time).
     * @param  nonce       Unique nonce.
     * @param  v           v of the signature.
     * @param  r           r of the signature.
     * @param  s           s of the signature.
     */
    function transferWithAuthorization(
        address from,
        address to,
        uint256 value,
        uint256 validAfter,
        uint256 validBefore,
        bytes32 nonce,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;

    /**
     * @notice Receive a transfer with a signed authorization from the payer.
     * @dev    This has an additional check to ensure that the payee's address matches
     *         the caller of this function to prevent front-running attacks.
     *         (See security considerations)
     * @param  from        Payer's address (Authorizer).
     * @param  to          Payee's address.
     * @param  value       Amount to be transferred.
     * @param  validAfter  The time after which this is valid (unix time).
     * @param  validBefore The time before which this is valid (unix time).
     * @param  nonce       Unique nonce.
     * @param  signature   A byte array ECDSA/secp256k1 signature (encoded r, s, v).
     */
    function receiveWithAuthorization(
        address from,
        address to,
        uint256 value,
        uint256 validAfter,
        uint256 validBefore,
        bytes32 nonce,
        bytes memory signature
    ) external;

    /**
     * @notice Receive a transfer with a signed authorization from the payer.
     * @dev    This has an additional check to ensure that the payee's address matches
     *         the caller of this function to prevent front-running attacks.
     *         (See security considerations)
     * @param  from        Payer's address (Authorizer).
     * @param  to          Payee's address.
     * @param  value       Amount to be transferred.
     * @param  validAfter  The time after which this is valid (unix time).
     * @param  validBefore The time before which this is valid (unix time).
     * @param  nonce       Unique nonce.
     * @param  r           An ECDSA/secp256k1 signature parameter.
     * @param  vs          An ECDSA/secp256k1 short signature parameter.
     */
    function receiveWithAuthorization(
        address from,
        address to,
        uint256 value,
        uint256 validAfter,
        uint256 validBefore,
        bytes32 nonce,
        bytes32 r,
        bytes32 vs
    ) external;

    /**
     * @notice Receive a transfer with a signed authorization from the payer.
     * @dev    This has an additional check to ensure that the payee's address matches
     *         the caller of this function to prevent front-running attacks.
     *         (See security considerations)
     * @param  from        Payer's address (Authorizer).
     * @param  to          Payee's address.
     * @param  value       Amount to be transferred.
     * @param  validAfter  The time after which this is valid (unix time).
     * @param  validBefore The time before which this is valid (unix time).
     * @param  nonce       Unique nonce.
     * @param  v           v of the signature.
     * @param  r           r of the signature.
     * @param  s           s of the signature.
     */
    function receiveWithAuthorization(
        address from,
        address to,
        uint256 value,
        uint256 validAfter,
        uint256 validBefore,
        bytes32 nonce,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;

    /**
     * @notice Attempt to cancel an authorization.
     * @param  authorizer Authorizer's address.
     * @param  nonce      Nonce of the authorization.
     * @param  signature  A byte array ECDSA/secp256k1 signature (encoded r, s, v).
     */
    function cancelAuthorization(address authorizer, bytes32 nonce, bytes memory signature) external;

    /**
     * @notice Attempt to cancel an authorization.
     * @param  authorizer Authorizer's address.
     * @param  nonce      Nonce of the authorization.
     * @param  r          An ECDSA/secp256k1 signature parameter.
     * @param  vs         An ECDSA/secp256k1 short signature parameter.
     */
    function cancelAuthorization(address authorizer, bytes32 nonce, bytes32 r, bytes32 vs) external;

    /**
     * @notice Attempt to cancel an authorization.
     * @param  authorizer Authorizer's address.
     * @param  nonce      Nonce of the authorization.
     * @param  v          v of the signature.
     * @param  r          r of the signature.
     * @param  s          s of the signature.
     */
    function cancelAuthorization(address authorizer, bytes32 nonce, uint8 v, bytes32 r, bytes32 s) external;

    /* ============ View/Pure Functions ============ */

    /**
     * @notice Returns the state of an authorization.
     * @dev    Nonces are randomly generated 32-byte data unique to the authorizer's address
     * @param  authorizer Authorizer's address.
     * @param  nonce      Nonce of the authorization.
     * @return True if the nonce is used.
     */
    function authorizationState(address authorizer, bytes32 nonce) external view returns (bool);

    /// @notice Returns `transferWithAuthorization` typehash.
    function TRANSFER_WITH_AUTHORIZATION_TYPEHASH() external view returns (bytes32);

    /// @notice Returns `receiveWithAuthorization` typehash.
    function RECEIVE_WITH_AUTHORIZATION_TYPEHASH() external view returns (bytes32);

    /// @notice Returns `cancelAuthorization` typehash.
    function CANCEL_AUTHORIZATION_TYPEHASH() external view returns (bytes32);
}

// SPDX-License-Identifier: GPL-3.0

pragma solidity >=0.8.20 <0.9.0;

import { IStatefulERC712 } from "./interfaces/IStatefulERC712.sol";

import { ERC712ExtendedUpgradeable } from "./ERC712ExtendedUpgradeable.sol";

abstract contract StatefulERC712ExtendedUpgradeableStorageLayout {
    /// @custom:storage-location erc7201:M0.storage.StatefulERC712Extended
    struct StatefulERC712ExtendedStorageStruct {
        mapping(address account => uint256 nonce) nonces; // Nonces for all signatures.
    }

    // keccak256(abi.encode(uint256(keccak256("M0.storage.StatefulERC712Extended")) - 1)) & ~bytes32(uint256(0xff))
    bytes32 private constant _STATEFUL_ERC712_EXTENDED_STORAGE_LOCATION =
        0x1b21ba3f0a2135d61c468900b54084f04af8111bce0f8bbb6ab8c46d11afbd00;

    function _getStatefulERC712ExtendedStorageLocation()
        internal
        pure
        returns (StatefulERC712ExtendedStorageStruct storage $)
    {
        assembly {
            $.slot := _STATEFUL_ERC712_EXTENDED_STORAGE_LOCATION
        }
    }
}

/**
 * @title  Stateful and upgradeable extension for EIP-712 typed structured data hashing and signing with nonces.
 * @author M0 Labs
 * @dev    An abstract implementation to satisfy stateful EIP-712 with nonces.
 */
abstract contract StatefulERC712Upgradeable is
    StatefulERC712ExtendedUpgradeableStorageLayout,
    IStatefulERC712,
    ERC712ExtendedUpgradeable
{
    /* ============ Initializer ============ */

    /**
     * @notice Initializes the StatefulERC712Upgradeable contract.
     * @param  name The name of the contract.
     */
    function __StatefulERC712ExtendedUpgradeable_init(string memory name) internal onlyInitializing {
        __ERC712ExtendedUpgradeable_init(name);
    }

    /* ============ View/Pure Functions ============ */

    /// @inheritdoc IStatefulERC712
    function nonces(address account) external view returns (uint256) {
        return _getStatefulERC712ExtendedStorageLocation().nonces[account];
    }
}

// SPDX-License-Identifier: GPL-3.0

pragma solidity >=0.8.20 <0.9.0;

import { IERC712Extended } from "./IERC712Extended.sol";

/**
 * @title  Stateful Extension for EIP-712 typed structured data hashing and signing with nonces.
 * @author M^0 Labs
 */
interface IStatefulERC712 is IERC712Extended {
    /* ============ Custom Errors ============ */

    /**
     * @notice Revert message when a signing account's nonce is not the expected current nonce.
     * @param  nonce         The nonce used in the signature.
     * @param  expectedNonce The expected nonce to be used in a signature by the signing account.
     */
    error InvalidAccountNonce(uint256 nonce, uint256 expectedNonce);

    /* ============ View/Pure Functions ============ */

    /**
     * @notice Returns the next nonce to be used in a signature by `account`.
     * @param  account The address of some account.
     * @return nonce   The next nonce to be used in a signature by `account`.
     */
    function nonces(address account) external view returns (uint256 nonce);
}

// SPDX-License-Identifier: GPL-3.0

pragma solidity >=0.8.20 <0.9.0;

import { Initializable } from "../lib/openzeppelin-contracts-upgradeable/contracts/proxy/utils/Initializable.sol";

import { IERC712 } from "./interfaces/IERC712.sol";
import { IERC712Extended } from "./interfaces/IERC712Extended.sol";

import { SignatureChecker } from "./libs/SignatureChecker.sol";

abstract contract ERC712ExtendedUpgradeableStorageLayout {
    /// @custom:storage-location erc7201:M0.storage.ERC712Extended
    struct ERC712ExtendedStorageStruct {
        uint256 initialChainId;
        bytes32 initialDomainSeparator;
        string name;
    }

    // keccak256(abi.encode(uint256(keccak256("M0.storage.ERC712Extended")) - 1)) & ~bytes32(uint256(0xff))
    bytes32 private constant _ERC712_EXTENDED_STORAGE_LOCATION =
        0x103ce0bed7138196cdb0d79ef04042681b16e7a2c58d74b78443c813042ea100;

    function _getERC712ExtendedStorageLocation() internal pure returns (ERC712ExtendedStorageStruct storage $) {
        assembly {
            $.slot := _ERC712_EXTENDED_STORAGE_LOCATION
        }
    }
}

/**
 * @title  Typed structured data hashing and signing via EIP-712, extended by EIP-5267.
 * @author M0 Labs
 * @dev    An abstract implementation to satisfy EIP-712: https://eips.ethereum.org/EIPS/eip-712
 */
abstract contract ERC712ExtendedUpgradeable is ERC712ExtendedUpgradeableStorageLayout, IERC712Extended, Initializable {
    /* ============ Variables ============ */

    /// @dev keccak256("EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)")
    bytes32 internal constant _EIP712_DOMAIN_HASH = 0x8b73c3c69bb8fe3d512ecc4cf759cc79239f7b179b0ffacaa9a75d522b39400f;

    /// @dev keccak256("1")
    bytes32 internal constant _EIP712_VERSION_HASH = 0xc89efdaa54c0f20c7adf612882df0950f5a951637e0307cdcb4c672f298b8bc6;

    /* ============ Initializer ============ */

    /**
     * @notice Initializes the ERC712ExtendedUpgradeable contract.
     * @param  name_ The name of the contract.
     */
    function __ERC712ExtendedUpgradeable_init(string memory name_) internal onlyInitializing {
        ERC712ExtendedStorageStruct storage $ = _getERC712ExtendedStorageLocation();

        $.name = name_;
        $.initialChainId = block.chainid;
        $.initialDomainSeparator = _getDomainSeparator();
    }

    /* ============ View/Pure Functions ============ */

    /// @inheritdoc IERC712Extended
    function eip712Domain()
        external
        view
        virtual
        returns (
            bytes1 fields_,
            string memory name_,
            string memory version_,
            uint256 chainId_,
            address verifyingContract_,
            bytes32 salt_,
            uint256[] memory extensions_
        )
    {
        return (
            hex"0f", // 01111
            _getERC712ExtendedStorageLocation().name,
            "1",
            block.chainid,
            address(this),
            bytes32(0),
            new uint256[](0)
        );
    }

    /// @inheritdoc IERC712
    function DOMAIN_SEPARATOR() public view virtual returns (bytes32) {
        ERC712ExtendedStorageStruct storage $ = _getERC712ExtendedStorageLocation();
        return block.chainid == $.initialChainId ? $.initialDomainSeparator : _getDomainSeparator();
    }

    /* ============ Internal View/Pure Functions ============ */

    /**
     * @dev    Computes the EIP-712 domain separator.
     * @return The EIP-712 domain separator.
     */
    function _getDomainSeparator() internal view returns (bytes32) {
        return
            keccak256(
                abi.encode(
                    _EIP712_DOMAIN_HASH,
                    keccak256(bytes(_getERC712ExtendedStorageLocation().name)),
                    _EIP712_VERSION_HASH,
                    block.chainid,
                    address(this)
                )
            );
    }

    /**
     * @dev    Returns the digest to be signed, via EIP-712, given an internal digest (i.e. hash struct).
     * @param  internalDigest_ The internal digest.
     * @return The digest to be signed.
     */
    function _getDigest(bytes32 internalDigest_) internal view returns (bytes32) {
        return keccak256(abi.encodePacked("\x19\x01", DOMAIN_SEPARATOR(), internalDigest_));
    }

    /**
     * @dev   Revert if the signature is expired.
     * @param expiry_ Timestamp at which the signature expires or max uint256 for no expiry.
     */
    function _revertIfExpired(uint256 expiry_) internal view {
        if (block.timestamp > expiry_) revert SignatureExpired(expiry_, block.timestamp);
    }

    /**
     * @dev   Revert if the signature is invalid.
     * @dev   We first validate if the signature is a valid ECDSA signature and return early if it is the case.
     *        Then, we validate if it is a valid ERC-1271 signature, and return early if it is the case.
     *        If not, we revert with the error from the ECDSA signature validation.
     * @param signer_    The signer of the signature.
     * @param digest_    The digest that was signed.
     * @param signature_ The signature.
     */
    function _revertIfInvalidSignature(address signer_, bytes32 digest_, bytes memory signature_) internal view {
        SignatureChecker.Error error_ = SignatureChecker.validateECDSASignature(signer_, digest_, signature_);

        if (error_ == SignatureChecker.Error.NoError) return;

        if (SignatureChecker.isValidERC1271Signature(signer_, digest_, signature_)) return;

        _revertIfError(error_);
    }

    /**
     * @dev    Returns the signer of a signed digest, via EIP-712, and reverts if the signature is invalid.
     * @param  digest_ The digest that was signed.
     * @param  v_      v of the signature.
     * @param  r_      r of the signature.
     * @param  s_      s of the signature.
     * @return signer_ The signer of the digest.
     */
    function _getSignerAndRevertIfInvalidSignature(
        bytes32 digest_,
        uint8 v_,
        bytes32 r_,
        bytes32 s_
    ) internal pure returns (address signer_) {
        SignatureChecker.Error error_;

        (error_, signer_) = SignatureChecker.recoverECDSASigner(digest_, v_, r_, s_);

        _revertIfError(error_);
    }

    /**
     * @dev   Revert if the signature is invalid.
     * @param signer_ The signer of the signature.
     * @param digest_ The digest that was signed.
     * @param r_      An ECDSA/secp256k1 signature parameter.
     * @param vs_     An ECDSA/secp256k1 short signature parameter.
     */
    function _revertIfInvalidSignature(address signer_, bytes32 digest_, bytes32 r_, bytes32 vs_) internal pure {
        _revertIfError(SignatureChecker.validateECDSASignature(signer_, digest_, r_, vs_));
    }

    /**
     * @dev   Revert if the signature is invalid.
     * @param signer_ The signer of the signature.
     * @param digest_ The digest that was signed.
     * @param v_      v of the signature.
     * @param r_      r of the signature.
     * @param s_      s of the signature.
     */
    function _revertIfInvalidSignature(
        address signer_,
        bytes32 digest_,
        uint8 v_,
        bytes32 r_,
        bytes32 s_
    ) internal pure {
        _revertIfError(SignatureChecker.validateECDSASignature(signer_, digest_, v_, r_, s_));
    }

    /**
     * @dev   Revert if error.
     * @param error_ The SignatureChecker Error enum.
     */
    function _revertIfError(SignatureChecker.Error error_) private pure {
        if (error_ == SignatureChecker.Error.NoError) return;
        if (error_ == SignatureChecker.Error.InvalidSignature) revert InvalidSignature();
        if (error_ == SignatureChecker.Error.InvalidSignatureLength) revert InvalidSignatureLength();
        if (error_ == SignatureChecker.Error.InvalidSignatureS) revert InvalidSignatureS();
        if (error_ == SignatureChecker.Error.InvalidSignatureV) revert InvalidSignatureV();
        if (error_ == SignatureChecker.Error.SignerMismatch) revert SignerMismatch();

        revert InvalidSignature();
    }
}

// SPDX-License-Identifier: GPL-3.0

pragma solidity >=0.8.20 <0.9.0;

import { IERC712 } from "./IERC712.sol";

/**
 * @title  EIP-712 extended by EIP-5267.
 * @author M^0 Labs
 * @dev    The additional interface as defined by EIP-5267: https://eips.ethereum.org/EIPS/eip-5267
 */
interface IERC712Extended is IERC712 {
    /* ============ Events ============ */

    /// @notice MAY be emitted to signal that the domain could have changed.
    event EIP712DomainChanged();

    /* ============ View/Pure Functions ============ */

    /// @notice Returns the fields and values that describe the domain separator used by this contract for EIP-712.
    function eip712Domain()
        external
        view
        returns (
            bytes1 fields,
            string memory name,
            string memory version,
            uint256 chainId,
            address verifyingContract,
            bytes32 salt,
            uint256[] memory extensions
        );
}

// SPDX-License-Identifier: GPL-3.0

pragma solidity >=0.8.20 <0.9.0;

/**
 * @title  Typed structured data hashing and signing via EIP-712.
 * @author M^0 Labs
 * @dev    The interface as defined by EIP-712: https://eips.ethereum.org/EIPS/eip-712
 */
interface IERC712 {
    /* ============ Custom Errors ============ */

    /// @notice Revert message when an invalid signature is detected.
    error InvalidSignature();

    /// @notice Revert message when a signature with invalid length is detected.
    error InvalidSignatureLength();

    /// @notice Revert message when the S portion of a signature is invalid.
    error InvalidSignatureS();

    /// @notice Revert message when the V portion of a signature is invalid.
    error InvalidSignatureV();

    /**
     * @notice Revert message when a signature is being used beyond its deadline (i.e. expiry).
     * @param  deadline  The last timestamp where the signature is still valid.
     * @param  timestamp The current timestamp.
     */
    error SignatureExpired(uint256 deadline, uint256 timestamp);

    /// @notice Revert message when a recovered signer does not match the account being purported to have signed.
    error SignerMismatch();

    /* ============ View/Pure Functions ============ */

    /// @notice Returns the EIP712 domain separator used in the encoding of a signed digest.
    function DOMAIN_SEPARATOR() external view returns (bytes32);
}

// SPDX-License-Identifier: GPL-3.0

pragma solidity >=0.8.20 <0.9.0;

import { IERC1271 } from "../interfaces/IERC1271.sol";

/**
 * @title  A library to handle ECDSA/secp256k1 and ERC1271 signatures, individually or in arbitrarily in combination.
 * @author M^0 Labs
 */
library SignatureChecker {
    /* ============ Enums ============ */

    /**
     * @notice An enum representing the possible errors that can be emitted during signature validation.
     * @param  NoError                No error occurred during signature validation.
     * @param  InvalidSignature       The signature is invalid.
     * @param  InvalidSignatureLength The signature length is invalid.
     * @param  InvalidSignatureS      The signature parameter S is invalid.
     * @param  InvalidSignatureV      The signature parameter V is invalid.
     * @param  SignerMismatch         The signer does not match the recovered signer.
     */
    enum Error {
        NoError,
        InvalidSignature,
        InvalidSignatureLength,
        InvalidSignatureS,
        InvalidSignatureV,
        SignerMismatch
    }

    /* ============ Internal View/Pure Functions ============ */

    /**
     * @dev    Returns whether a signature is valid (ECDSA/secp256k1 or ERC1271) for a signer and digest.
     * @dev    Signatures must not be used as unique identifiers since the `ecrecover` EVM opcode
     *         allows for malleable (non-unique) signatures.
     *         See https://github.com/OpenZeppelin/openzeppelin-contracts/security/advisories/GHSA-4h98-2769-gh6h
     * @param  signer    The address of the account purported to have signed.
     * @param  digest    The hash of the data that was signed.
     * @param  signature A byte array signature.
     * @return           Whether the signature is valid or not.
     */
    function isValidSignature(address signer, bytes32 digest, bytes memory signature) internal view returns (bool) {
        return isValidECDSASignature(signer, digest, signature) || isValidERC1271Signature(signer, digest, signature);
    }

    /**
     * @dev    Returns whether an ERC1271 signature is valid for a signer and digest.
     * @param  signer    The address of the account purported to have signed.
     * @param  digest    The hash of the data that was signed.
     * @param  signature A byte array ERC1271 signature.
     * @return           Whether the signature is valid or not.
     */
    function isValidERC1271Signature(
        address signer,
        bytes32 digest,
        bytes memory signature
    ) internal view returns (bool) {
        (bool success_, bytes memory result_) = signer.staticcall(
            abi.encodeCall(IERC1271.isValidSignature, (digest, signature))
        );

        return
            success_ &&
            result_.length >= 32 &&
            abi.decode(result_, (bytes32)) == bytes32(IERC1271.isValidSignature.selector);
    }

    /**
     * @dev    Decodes an ECDSA/secp256k1 signature from a byte array to standard v, r, and s parameters.
     * @param  signature A byte array ECDSA/secp256k1 signature.
     * @return v         An ECDSA/secp256k1 signature parameter.
     * @return r         An ECDSA/secp256k1 signature parameter.
     * @return s         An ECDSA/secp256k1 signature parameter.
     */
    function decodeECDSASignature(bytes memory signature) internal pure returns (uint8 v, bytes32 r, bytes32 s) {
        // ecrecover takes the signature parameters, and they can be decoded using assembly.
        /// @solidity memory-safe-assembly
        assembly {
            r := mload(add(signature, 0x20))
            s := mload(add(signature, 0x40))
            v := byte(0, mload(add(signature, 0x60)))
        }
    }

    /**
     * @dev    Decodes an ECDSA/secp256k1 short signature as defined by EIP2098
     *         from a byte array to standard v, r, and s parameters.
     * @param  signature A byte array ECDSA/secp256k1 short signature.
     * @return r         An ECDSA/secp256k1 signature parameter.
     * @return vs        An ECDSA/secp256k1 short signature parameter.
     */
    function decodeShortECDSASignature(bytes memory signature) internal pure returns (bytes32 r, bytes32 vs) {
        // ecrecover takes the signature parameters, and they can be decoded using assembly.
        /// @solidity memory-safe-assembly
        assembly {
            r := mload(add(signature, 0x20))
            vs := mload(add(signature, 0x40))
        }
    }

    /**
     * @dev    Returns whether an ECDSA/secp256k1 signature is valid for a signer and digest.
     * @param  signer    The address of the account purported to have signed.
     * @param  digest    The hash of the data that was signed.
     * @param  signature A byte array ECDSA/secp256k1 signature (encoded r, s, v).
     * @return           Whether the signature is valid or not.
     */
    function isValidECDSASignature(
        address signer,
        bytes32 digest,
        bytes memory signature
    ) internal pure returns (bool) {
        if (signature.length == 64) {
            (bytes32 r, bytes32 vs) = decodeShortECDSASignature(signature);
            return isValidECDSASignature(signer, digest, r, vs);
        }

        return validateECDSASignature(signer, digest, signature) == Error.NoError;
    }

    /**
     * @dev    Returns whether an ECDSA/secp256k1 short signature is valid for a signer and digest.
     * @param  signer The address of the account purported to have signed.
     * @param  digest The hash of the data that was signed.
     * @param  r      An ECDSA/secp256k1 signature parameter.
     * @param  vs     An ECDSA/secp256k1 short signature parameter.
     * @return        Whether the signature is valid or not.
     */
    function isValidECDSASignature(address signer, bytes32 digest, bytes32 r, bytes32 vs) internal pure returns (bool) {
        return validateECDSASignature(signer, digest, r, vs) == Error.NoError;
    }

    /**
     * @dev    Returns the signer of an ECDSA/secp256k1 signature for some digest.
     * @param  digest    The hash of the data that was signed.
     * @param  signature A byte array ECDSA/secp256k1 signature.
     * @return           An error, if any, that occurred during the signer recovery.
     * @return           The address of the account recovered form the signature (0 if error).
     */
    function recoverECDSASigner(bytes32 digest, bytes memory signature) internal pure returns (Error, address) {
        if (signature.length != 65) return (Error.InvalidSignatureLength, address(0));

        (uint8 v, bytes32 r, bytes32 s) = decodeECDSASignature(signature);

        return recoverECDSASigner(digest, v, r, s);
    }

    /**
     * @dev    Returns the signer of an ECDSA/secp256k1 short signature for some digest.
     * @dev    See https://eips.ethereum.org/EIPS/eip-2098
     * @param  digest The hash of the data that was signed.
     * @param  r      An ECDSA/secp256k1 signature parameter.
     * @param  vs     An ECDSA/secp256k1 short signature parameter.
     * @return        An error, if any, that occurred during the signer recovery.
     * @return        The address of the account recovered form the signature (0 if error).
     */
    function recoverECDSASigner(bytes32 digest, bytes32 r, bytes32 vs) internal pure returns (Error, address) {
        unchecked {
            // We do not check for an overflow here since the shift operation results in 0 or 1.
            uint8 v = uint8((uint256(vs) >> 255) + 27);
            bytes32 s = vs & bytes32(0x7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff);
            return recoverECDSASigner(digest, v, r, s);
        }
    }

    /**
     * @dev    Returns the signer of an ECDSA/secp256k1 signature for some digest.
     * @param  digest The hash of the data that was signed.
     * @param  v      An ECDSA/secp256k1 signature parameter.
     * @param  r      An ECDSA/secp256k1 signature parameter.
     * @param  s      An ECDSA/secp256k1 signature parameter.
     * @return        An error, if any, that occurred during the signer recovery.
     * @return signer The address of the account recovered form the signature (0 if error).
     */
    function recoverECDSASigner(
        bytes32 digest,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal pure returns (Error, address signer) {
        // Appendix F in the Ethereum Yellow paper (https://ethereum.github.io/yellowpaper/paper.pdf), defines
        // the valid range for s in (301): 0 < s < secp256k1n ÷ 2 + 1, and for v in (302): v ∈ {27, 28}.
        if (uint256(s) > uint256(0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0))
            return (Error.InvalidSignatureS, address(0));

        if (v != 27 && v != 28) return (Error.InvalidSignatureV, address(0));

        signer = ecrecover(digest, v, r, s);

        return (signer == address(0)) ? (Error.InvalidSignature, address(0)) : (Error.NoError, signer);
    }

    /**
     * @dev    Returns an error, if any, in validating an ECDSA/secp256k1 signature for a signer and digest.
     * @param  signer    The address of the account purported to have signed.
     * @param  digest    The hash of the data that was signed.
     * @param  signature A byte array ERC1271 signature.
     * @return           An error, if any, that occurred during the signer recovery.
     */
    function validateECDSASignature(
        address signer,
        bytes32 digest,
        bytes memory signature
    ) internal pure returns (Error) {
        (Error recoverError, address recoveredSigner) = recoverECDSASigner(digest, signature);

        return (recoverError == Error.NoError) ? validateRecoveredSigner(signer, recoveredSigner) : recoverError;
    }

    /**
     * @dev    Returns an error, if any, in validating an ECDSA/secp256k1 short signature for a signer and digest.
     * @param  signer The address of the account purported to have signed.
     * @param  digest The hash of the data that was signed.
     * @param  r      An ECDSA/secp256k1 signature parameter.
     * @param  vs     An ECDSA/secp256k1 short signature parameter.
     * @return        An error, if any, that occurred during the signer recovery.
     */
    function validateECDSASignature(
        address signer,
        bytes32 digest,
        bytes32 r,
        bytes32 vs
    ) internal pure returns (Error) {
        (Error recoverError, address recoveredSigner) = recoverECDSASigner(digest, r, vs);

        return (recoverError == Error.NoError) ? validateRecoveredSigner(signer, recoveredSigner) : recoverError;
    }

    /**
     * @dev    Returns an error, if any, in validating an ECDSA/secp256k1 signature for a signer and digest.
     * @param  signer The address of the account purported to have signed.
     * @param  digest The hash of the data that was signed.
     * @param  v      An ECDSA/secp256k1 signature parameter.
     * @param  r      An ECDSA/secp256k1 signature parameter.
     * @param  s      An ECDSA/secp256k1 signature parameter.
     * @return        An error, if any, that occurred during the signer recovery.
     */
    function validateECDSASignature(
        address signer,
        bytes32 digest,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal pure returns (Error) {
        (Error recoverError, address recoveredSigner) = recoverECDSASigner(digest, v, r, s);

        return (recoverError == Error.NoError) ? validateRecoveredSigner(signer, recoveredSigner) : recoverError;
    }

    /**
     * @dev    Returns an error if `signer` is not `recoveredSigner`.
     * @param  signer          The address of the some signer.
     * @param  recoveredSigner The address of the some recoveredSigner.
     * @return                 An error if `signer` is not `recoveredSigner`.
     */
    function validateRecoveredSigner(address signer, address recoveredSigner) internal pure returns (Error) {
        return (signer == recoveredSigner) ? Error.NoError : Error.SignerMismatch;
    }
}

// SPDX-License-Identifier: GPL-3.0

pragma solidity >=0.8.20 <0.9.0;

/**
 * @title  Standard Signature Validation Method for Contracts via EIP-1271.
 * @author M^0 Labs
 * @dev    The interface as defined by EIP-1271: https://eips.ethereum.org/EIPS/eip-1271
 */
interface IERC1271 {
    /**
     * @dev    Returns a specific magic value if the provided signature is valid for the provided digest.
     * @param  digest     Hash of the data purported to have been signed.
     * @param  signature  Signature byte array associated with the digest.
     * @return magicValue Magic value 0x1626ba7e if the signature is valid.
     */
    function isValidSignature(bytes32 digest, bytes memory signature) external view returns (bytes4 magicValue);
}

{
  "remappings": [
    "@ensdomains/=lib/evm-m-extensions/lib/uniswap-v4-periphery/lib/v4-core/node_modules/@ensdomains/",
    "@openzeppelin/contracts-upgradeable/=lib/evm-m-extensions/lib/common/lib/openzeppelin-contracts-upgradeable/contracts/",
    "@openzeppelin/contracts/=lib/evm-m-extensions/lib/common/lib/openzeppelin-contracts-upgradeable/lib/openzeppelin-contracts/contracts/",
    "@uniswap/v4-core/=lib/evm-m-extensions/lib/uniswap-v4-periphery/lib/v4-core/",
    "common/=lib/evm-m-extensions/lib/common/src/",
    "ds-test/=lib/evm-m-extensions/lib/uniswap-v4-periphery/lib/v4-core/lib/forge-std/lib/ds-test/src/",
    "erc4626-tests/=lib/evm-m-extensions/lib/common/lib/openzeppelin-contracts-upgradeable/lib/erc4626-tests/",
    "evm-m-extensions/=lib/evm-m-extensions/",
    "forge-gas-snapshot/=lib/evm-m-extensions/lib/uniswap-v4-periphery/lib/permit2/lib/forge-gas-snapshot/src/",
    "forge-std/=lib/forge-std/src/",
    "halmos-cheatcodes/=lib/evm-m-extensions/lib/common/lib/openzeppelin-contracts-upgradeable/lib/halmos-cheatcodes/src/",
    "hardhat/=lib/evm-m-extensions/lib/uniswap-v4-periphery/lib/v4-core/node_modules/hardhat/",
    "openzeppelin-contracts-upgradeable/=lib/evm-m-extensions/lib/common/lib/openzeppelin-contracts-upgradeable/",
    "openzeppelin-contracts/=lib/evm-m-extensions/lib/uniswap-v4-periphery/lib/v4-core/lib/openzeppelin-contracts/",
    "openzeppelin-foundry-upgrades/=lib/evm-m-extensions/lib/openzeppelin-foundry-upgrades/src/",
    "permit2/=lib/evm-m-extensions/lib/uniswap-v4-periphery/lib/permit2/",
    "solmate/=lib/evm-m-extensions/lib/uniswap-v4-periphery/lib/v4-core/lib/solmate/",
    "uniswap-v4-periphery/=lib/evm-m-extensions/lib/uniswap-v4-periphery/",
    "v4-core/=lib/evm-m-extensions/lib/uniswap-v4-periphery/lib/v4-core/src/",
    "wrapped-m-token/=lib/evm-m-extensions/lib/wrapped-m-token/"
  ],
  "optimizer": {
    "enabled": true,
    "runs": 999999
  },
  "metadata": {
    "useLiteralContent": false,
    "bytecodeHash": "ipfs",
    "appendCBOR": true
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "evmVersion": "london",
  "viaIR": false
}

• No Contract Security Audit Submitted- Submit Audit Here

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000000000000000000000000866a2bf4e572cbcf37d5071a7a58503bfb36be1b000000000000000000000000b6807116b3b1b321a390594e31ecd6e0076f6278

-----Decoded View---------------
Arg [0] : mToken (address): 0x866A2BF4E572CbcF37D5071A7a58503Bfb36be1b
Arg [1] : swapFacility (address): 0xB6807116b3B1B321a390594e31ECD6e0076f6278

-----Encoded View---------------
2 Constructor Arguments found :
Arg [0] : 000000000000000000000000866a2bf4e572cbcf37d5071a7a58503bfb36be1b
Arg [1] : 000000000000000000000000b6807116b3b1b321a390594e31ecd6e0076f6278