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// SPDX-License-Identifier: CC-BY-NC-4.0
pragma solidity 0.8.17;

import "@openzeppelin/contracts/token/ERC20/extensions/ERC20Burnable.sol";
import "@openzeppelin/contracts/access/AccessControl.sol";
import "../OFTV2.sol";

contract XArcadeToken is OFTV2, ERC20Burnable {
  /**
   * @notice The Arcade Swap Contract is set as the only address that is
   *      allowed to mint or burn tokens after contract creation
   */
  address public ArcadeSwapContractAddress;

  /**
   * @notice The max supply of XArcade token allowed
   */
  uint256 private constant MAX_SUPPLY = 800_000_000 * 10 ** 18;

  /**
   * @notice Boolean for vaults being minted to
   */
  bool public vaultsMinted;

  /**
   * @notice The contract administrator
   */
  bytes32 public constant CONTRACT_ADMIN_ROLE =
    keccak256("CONTRACT_ADMIN_ROLE");

  /**
   * @notice The contract administrator address
   */
  address public contractAdmin;

  /**
   * @notice Initialize the contract
   *
   * @param _layerZeroEndpoint The Layer Zero endpoint network address deployed
   * @param _sharedDecimals The number of decimals to use for the token
   */
  constructor(
    address _layerZeroEndpoint,
    uint8 _sharedDecimals
  ) OFTV2("xArcade Token", "xARC", _sharedDecimals, _layerZeroEndpoint) {
    contractAdmin = msg.sender;
  }

  /**
   * @notice Modifier that requires msg.sender to be Arcade Swap contract
   * @dev Required in mint and burn functions
   */
  modifier isArcadeSwapContract() {
    require(
      msg.sender == ArcadeSwapContractAddress,
      "Caller must be Arcade Swap contract"
    );
    _;
  }

  /**
   * @dev Fired in mintXArcade()
   *
   * @param amount the amount of $xARC tokens minted
   */
  event XArcadeMinted(uint256 amount);

  /**
   * @dev Fired in burnXArcade()
   *
   * @param amount the amount of $xARC tokens burned
   */
  event XArcadeBurned(uint256 amount);

  /**
   * @dev Fired in updateArcadeSwapContract()
   *
   * @param newAddress the new address of Arcade Swap contract
   */
  event ArcadeSwapContractUpdated(address indexed newAddress);

  /**
   * @dev Fired in updateVaultsMinted()
   *
   */
  event VaultsMinted();

  /**
   * @notice Mint and deposit `amount` $xARC tokens to message sender
   *
   * @dev Throws on the following restriction errors:
   *      * Caller is not Arcade Swap contract
   *      * Mint exceeds MAX_SUPPLY
   *
   * @param _amount The amount of tokens to be minted
   */
  function mintXArcade(uint256 _amount) public isArcadeSwapContract {
    require(
      totalSupply() + _amount <= MAX_SUPPLY,
      "Amount to mint will exceed total supply"
    );
    _mint(ArcadeSwapContractAddress, _amount);

    ERC20(this).increaseAllowance(ArcadeSwapContractAddress, _amount);

    emit XArcadeMinted(_amount);
  }

  /**
   * @notice Burn and destroy `amount` $xARC tokens from message sender
   *
   * @dev Throws on the following restriction errors:
   *      * Caller is not Arcade Swap contract
   *      * Total supply cannot be less than 0
   *
   * @param _amount The amount of tokens to be burned
   */
  function burnXArcade(uint256 _amount) public isArcadeSwapContract {
    require(totalSupply() - _amount >= 0, "Cannot burn tokens below 0");
    _burn(address(msg.sender), _amount);

    emit XArcadeBurned(_amount);
  }

  /**
   * @notice Update the address of Arcade Swap contract
   *
   * @dev Throws on the following restriction errors:
   *      * Caller is not the Contract Admin
   *
   * @param _ArcadeSwapContractAddress address of the Arcade Swap contract
   */
  function updateArcadeSwapContract(
    address _ArcadeSwapContractAddress
  ) public onlyContractAdmin {
    ArcadeSwapContractAddress = _ArcadeSwapContractAddress;

    _approve(ArcadeSwapContractAddress, ArcadeSwapContractAddress, MAX_SUPPLY);

    emit ArcadeSwapContractUpdated(_ArcadeSwapContractAddress);
  }

  /**
   * @notice Mint tokens to a specified vault
   * @param _vaultAddress Address of the vault to mint tokens to
   */
  function mintToVault(
    address _vaultAddress,
    uint256 _amount
  ) public onlyContractAdmin {
    require(
      totalSupply() + _amount <= MAX_SUPPLY,
      "Amount to mint will exceed total supply"
    );
    require(!vaultsMinted, "Vaults have already been minted");
    require(_vaultAddress != address(0), "Vault address cannot be 0x0");
    _mint(_vaultAddress, _amount);

    emit XArcadeMinted(_amount);
  }

  /**
   * @notice Update all vaults have been minted
   */
  function updateVaultsMinted() public onlyContractAdmin {
    vaultsMinted = true;

    emit VaultsMinted();
  }

  /**
   * @notice Update the contract administrator
   */
  function updateContractAdmin(
    address _contractAdmin
  ) public onlyContractAdmin {
    contractAdmin = _contractAdmin;
  }

  /**
   * @notice Modifier that requires msg.sender to be contract admin
   */
  modifier onlyContractAdmin() {
    require(msg.sender == contractAdmin, "Caller must be contract admin");
    _;
  }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (access/AccessControl.sol)

pragma solidity ^0.8.0;

import "./IAccessControl.sol";
import "../utils/Context.sol";
import "../utils/Strings.sol";
import "../utils/introspection/ERC165.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 AccessControl is Context, IAccessControl, ERC165 {
    struct RoleData {
        mapping(address => bool) members;
        bytes32 adminRole;
    }

    mapping(bytes32 => RoleData) private _roles;

    bytes32 public constant DEFAULT_ADMIN_ROLE = 0x00;

    /**
     * @dev Modifier that checks that an account has a specific role. Reverts
     * with a standardized message including the required role.
     *
     * The format of the revert reason is given by the following regular expression:
     *
     *  /^AccessControl: account (0x[0-9a-f]{40}) is missing role (0x[0-9a-f]{64})$/
     *
     * _Available since v4.1._
     */
    modifier onlyRole(bytes32 role) {
        _checkRole(role);
        _;
    }

    /**
     * @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 override returns (bool) {
        return _roles[role].members[account];
    }

    /**
     * @dev Revert with a standard message if `_msgSender()` is missing `role`.
     * Overriding this function changes the behavior of the {onlyRole} modifier.
     *
     * Format of the revert message is described in {_checkRole}.
     *
     * _Available since v4.6._
     */
    function _checkRole(bytes32 role) internal view virtual {
        _checkRole(role, _msgSender());
    }

    /**
     * @dev Revert with a standard message if `account` is missing `role`.
     *
     * The format of the revert reason is given by the following regular expression:
     *
     *  /^AccessControl: account (0x[0-9a-f]{40}) is missing role (0x[0-9a-f]{64})$/
     */
    function _checkRole(bytes32 role, address account) internal view virtual {
        if (!hasRole(role, account)) {
            revert(
                string(
                    abi.encodePacked(
                        "AccessControl: account ",
                        Strings.toHexString(account),
                        " is missing role ",
                        Strings.toHexString(uint256(role), 32)
                    )
                )
            );
        }
    }

    /**
     * @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 override returns (bytes32) {
        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 override 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 override 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 `account`.
     *
     * May emit a {RoleRevoked} event.
     */
    function renounceRole(bytes32 role, address account) public virtual override {
        require(account == _msgSender(), "AccessControl: can only renounce roles for self");

        _revokeRole(role, account);
    }

    /**
     * @dev Grants `role` to `account`.
     *
     * If `account` had not been already granted `role`, emits a {RoleGranted}
     * event. Note that unlike {grantRole}, this function doesn't perform any
     * checks on the calling account.
     *
     * May emit a {RoleGranted} event.
     *
     * [WARNING]
     * ====
     * This function should only be called from the constructor when setting
     * up the initial roles for the system.
     *
     * Using this function in any other way is effectively circumventing the admin
     * system imposed by {AccessControl}.
     * ====
     *
     * NOTE: This function is deprecated in favor of {_grantRole}.
     */
    function _setupRole(bytes32 role, address account) internal virtual {
        _grantRole(role, account);
    }

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

    /**
     * @dev Grants `role` to `account`.
     *
     * Internal function without access restriction.
     *
     * May emit a {RoleGranted} event.
     */
    function _grantRole(bytes32 role, address account) internal virtual {
        if (!hasRole(role, account)) {
            _roles[role].members[account] = true;
            emit RoleGranted(role, account, _msgSender());
        }
    }

    /**
     * @dev Revokes `role` from `account`.
     *
     * Internal function without access restriction.
     *
     * May emit a {RoleRevoked} event.
     */
    function _revokeRole(bytes32 role, address account) internal virtual {
        if (hasRole(role, account)) {
            _roles[role].members[account] = false;
            emit RoleRevoked(role, account, _msgSender());
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (access/IAccessControl.sol)

pragma solidity ^0.8.0;

/**
 * @dev External interface of AccessControl declared to support ERC165 detection.
 */
interface IAccessControl {
    /**
     * @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 signaling this.
     *
     * _Available since v3.1._
     */
    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, an admin role
     * bearer except when using {AccessControl-_setupRole}.
     */
    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 `account`.
     */
    function renounceRole(bytes32 role, address account) external;
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (access/Ownable.sol)

pragma solidity ^0.8.0;

import "../utils/Context.sol";

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

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

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

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

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

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

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

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

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/ERC20.sol)

pragma solidity ^0.8.0;

import "./IERC20.sol";
import "./extensions/IERC20Metadata.sol";
import "../../utils/Context.sol";

/**
 * @dev Implementation of the {IERC20} interface.
 *
 * This implementation is agnostic to the way tokens are created. This means
 * that a supply mechanism has to be added in a derived contract using {_mint}.
 * For a generic mechanism see {ERC20PresetMinterPauser}.
 *
 * TIP: For a detailed writeup see our guide
 * https://forum.openzeppelin.com/t/how-to-implement-erc20-supply-mechanisms/226[How
 * to implement supply mechanisms].
 *
 * The default value of {decimals} is 18. To change this, you should override
 * this function so it returns a different value.
 *
 * We have followed general OpenZeppelin Contracts guidelines: functions revert
 * instead returning `false` on failure. This behavior is nonetheless
 * conventional and does not conflict with the expectations of ERC20
 * applications.
 *
 * Additionally, an {Approval} event is emitted on calls to {transferFrom}.
 * This allows applications to reconstruct the allowance for all accounts just
 * by listening to said events. Other implementations of the EIP may not emit
 * these events, as it isn't required by the specification.
 *
 * Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
 * functions have been added to mitigate the well-known issues around setting
 * allowances. See {IERC20-approve}.
 */
contract ERC20 is Context, IERC20, IERC20Metadata {
    mapping(address => uint256) private _balances;

    mapping(address => mapping(address => uint256)) private _allowances;

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;

    /**
     * @dev Sets the values for {name} and {symbol}.
     *
     * All two of these values are immutable: they can only be set once during
     * construction.
     */
    constructor(string memory name_, string memory symbol_) {
        _name = name_;
        _symbol = symbol_;
    }

    /**
     * @dev Returns the name of the token.
     */
    function name() public view virtual override returns (string memory) {
        return _name;
    }

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view virtual override returns (string memory) {
        return _symbol;
    }

    /**
     * @dev Returns the number of decimals used to get its user representation.
     * For example, if `decimals` equals `2`, a balance of `505` tokens should
     * be displayed to a user as `5.05` (`505 / 10 ** 2`).
     *
     * Tokens usually opt for a value of 18, imitating the relationship between
     * Ether and Wei. This is the default value returned by this function, unless
     * it's overridden.
     *
     * NOTE: This information is only used for _display_ purposes: it in
     * no way affects any of the arithmetic of the contract, including
     * {IERC20-balanceOf} and {IERC20-transfer}.
     */
    function decimals() public view virtual override returns (uint8) {
        return 18;
    }

    /**
     * @dev See {IERC20-totalSupply}.
     */
    function totalSupply() public view virtual override returns (uint256) {
        return _totalSupply;
    }

    /**
     * @dev See {IERC20-balanceOf}.
     */
    function balanceOf(address account) public view virtual override returns (uint256) {
        return _balances[account];
    }

    /**
     * @dev See {IERC20-transfer}.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     * - the caller must have a balance of at least `amount`.
     */
    function transfer(address to, uint256 amount) public virtual override returns (bool) {
        address owner = _msgSender();
        _transfer(owner, to, amount);
        return true;
    }

    /**
     * @dev See {IERC20-allowance}.
     */
    function allowance(address owner, address spender) public view virtual override returns (uint256) {
        return _allowances[owner][spender];
    }

    /**
     * @dev See {IERC20-approve}.
     *
     * NOTE: If `amount` is the maximum `uint256`, the allowance is not updated on
     * `transferFrom`. This is semantically equivalent to an infinite approval.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        address owner = _msgSender();
        _approve(owner, spender, amount);
        return true;
    }

    /**
     * @dev See {IERC20-transferFrom}.
     *
     * Emits an {Approval} event indicating the updated allowance. This is not
     * required by the EIP. See the note at the beginning of {ERC20}.
     *
     * NOTE: Does not update the allowance if the current allowance
     * is the maximum `uint256`.
     *
     * Requirements:
     *
     * - `from` and `to` cannot be the zero address.
     * - `from` must have a balance of at least `amount`.
     * - the caller must have allowance for ``from``'s tokens of at least
     * `amount`.
     */
    function transferFrom(address from, address to, uint256 amount) public virtual override returns (bool) {
        address spender = _msgSender();
        _spendAllowance(from, spender, amount);
        _transfer(from, to, amount);
        return true;
    }

    /**
     * @dev Atomically increases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        address owner = _msgSender();
        _approve(owner, spender, allowance(owner, spender) + addedValue);
        return true;
    }

    /**
     * @dev Atomically decreases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `spender` must have allowance for the caller of at least
     * `subtractedValue`.
     */
    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
        address owner = _msgSender();
        uint256 currentAllowance = allowance(owner, spender);
        require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero");
        unchecked {
            _approve(owner, spender, currentAllowance - subtractedValue);
        }

        return true;
    }

    /**
     * @dev Moves `amount` of tokens from `from` to `to`.
     *
     * This internal function is equivalent to {transfer}, and can be used to
     * e.g. implement automatic token fees, slashing mechanisms, etc.
     *
     * Emits a {Transfer} event.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `from` must have a balance of at least `amount`.
     */
    function _transfer(address from, address to, uint256 amount) internal virtual {
        require(from != address(0), "ERC20: transfer from the zero address");
        require(to != address(0), "ERC20: transfer to the zero address");

        _beforeTokenTransfer(from, to, amount);

        uint256 fromBalance = _balances[from];
        require(fromBalance >= amount, "ERC20: transfer amount exceeds balance");
        unchecked {
            _balances[from] = fromBalance - amount;
            // Overflow not possible: the sum of all balances is capped by totalSupply, and the sum is preserved by
            // decrementing then incrementing.
            _balances[to] += amount;
        }

        emit Transfer(from, to, amount);

        _afterTokenTransfer(from, to, amount);
    }

    /** @dev Creates `amount` tokens and assigns them to `account`, increasing
     * the total supply.
     *
     * Emits a {Transfer} event with `from` set to the zero address.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     */
    function _mint(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: mint to the zero address");

        _beforeTokenTransfer(address(0), account, amount);

        _totalSupply += amount;
        unchecked {
            // Overflow not possible: balance + amount is at most totalSupply + amount, which is checked above.
            _balances[account] += amount;
        }
        emit Transfer(address(0), account, amount);

        _afterTokenTransfer(address(0), account, amount);
    }

    /**
     * @dev Destroys `amount` tokens from `account`, reducing the
     * total supply.
     *
     * Emits a {Transfer} event with `to` set to the zero address.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     * - `account` must have at least `amount` tokens.
     */
    function _burn(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: burn from the zero address");

        _beforeTokenTransfer(account, address(0), amount);

        uint256 accountBalance = _balances[account];
        require(accountBalance >= amount, "ERC20: burn amount exceeds balance");
        unchecked {
            _balances[account] = accountBalance - amount;
            // Overflow not possible: amount <= accountBalance <= totalSupply.
            _totalSupply -= amount;
        }

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

        _afterTokenTransfer(account, address(0), amount);
    }

    /**
     * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens.
     *
     * This internal function is equivalent to `approve`, and can be used to
     * e.g. set automatic allowances for certain subsystems, etc.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `owner` cannot be the zero address.
     * - `spender` cannot be the zero address.
     */
    function _approve(address owner, address spender, uint256 amount) internal virtual {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");

        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }

    /**
     * @dev Updates `owner` s allowance for `spender` based on spent `amount`.
     *
     * Does not update the allowance amount in case of infinite allowance.
     * Revert if not enough allowance is available.
     *
     * Might emit an {Approval} event.
     */
    function _spendAllowance(address owner, address spender, uint256 amount) internal virtual {
        uint256 currentAllowance = allowance(owner, spender);
        if (currentAllowance != type(uint256).max) {
            require(currentAllowance >= amount, "ERC20: insufficient allowance");
            unchecked {
                _approve(owner, spender, currentAllowance - amount);
            }
        }
    }

    /**
     * @dev Hook that is called before any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * will be transferred to `to`.
     * - when `from` is zero, `amount` tokens will be minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens will be burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual {}

    /**
     * @dev Hook that is called after any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * has been transferred to `to`.
     * - when `from` is zero, `amount` tokens have been minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens have been burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _afterTokenTransfer(address from, address to, uint256 amount) internal virtual {}
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (token/ERC20/extensions/ERC20Burnable.sol)

pragma solidity ^0.8.0;

import "../ERC20.sol";
import "../../../utils/Context.sol";

/**
 * @dev Extension of {ERC20} that allows token holders to destroy both their own
 * tokens and those that they have an allowance for, in a way that can be
 * recognized off-chain (via event analysis).
 */
abstract contract ERC20Burnable is Context, ERC20 {
    /**
     * @dev Destroys `amount` tokens from the caller.
     *
     * See {ERC20-_burn}.
     */
    function burn(uint256 amount) public virtual {
        _burn(_msgSender(), amount);
    }

    /**
     * @dev Destroys `amount` tokens from `account`, deducting from the caller's
     * allowance.
     *
     * See {ERC20-_burn} and {ERC20-allowance}.
     *
     * Requirements:
     *
     * - the caller must have allowance for ``accounts``'s tokens of at least
     * `amount`.
     */
    function burnFrom(address account, uint256 amount) public virtual {
        _spendAllowance(account, _msgSender(), amount);
        _burn(account, amount);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/IERC20Metadata.sol)

pragma solidity ^0.8.0;

import "../IERC20.sol";

/**
 * @dev Interface for the optional metadata functions from the ERC20 standard.
 *
 * _Available since v4.1._
 */
interface IERC20Metadata is IERC20 {
    /**
     * @dev Returns the name of the token.
     */
    function name() external view returns (string memory);

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

    /**
     * @dev Returns the decimals places of the token.
     */
    function decimals() external view returns (uint8);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);

    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `to`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address to, uint256 amount) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `from` to `to` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address from, address to, uint256 amount) external returns (bool);
}

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

pragma solidity ^0.8.0;

/**
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/ERC165.sol)

pragma solidity ^0.8.0;

import "./IERC165.sol";

/**
 * @dev Implementation of the {IERC165} interface.
 *
 * Contracts that want to implement ERC165 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);
 * }
 * ```
 *
 * Alternatively, {ERC165Storage} provides an easier to use but more expensive implementation.
 */
abstract contract ERC165 is IERC165 {
    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        return interfaceId == type(IERC165).interfaceId;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/IERC165.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC165 standard, as defined in the
 * https://eips.ethereum.org/EIPS/eip-165[EIP].
 *
 * 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[EIP section]
     * to learn more about how these ids are created.
     *
     * This function call must use less than 30 000 gas.
     */
    function supportsInterface(bytes4 interfaceId) external view returns (bool);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (utils/math/Math.sol)

pragma solidity ^0.8.0;

/**
 * @dev Standard math utilities missing in the Solidity language.
 */
library Math {
    enum Rounding {
        Down, // Toward negative infinity
        Up, // Toward infinity
        Zero // Toward zero
    }

    /**
     * @dev Returns the largest of two numbers.
     */
    function max(uint256 a, uint256 b) internal pure returns (uint256) {
        return a > b ? a : b;
    }

    /**
     * @dev Returns the smallest of two numbers.
     */
    function min(uint256 a, uint256 b) internal pure returns (uint256) {
        return a < b ? a : b;
    }

    /**
     * @dev Returns the average of two numbers. The result is rounded towards
     * zero.
     */
    function average(uint256 a, uint256 b) internal pure returns (uint256) {
        // (a + b) / 2 can overflow.
        return (a & b) + (a ^ b) / 2;
    }

    /**
     * @dev Returns the ceiling of the division of two numbers.
     *
     * This differs from standard division with `/` in that it rounds up instead
     * of rounding down.
     */
    function ceilDiv(uint256 a, uint256 b) internal pure returns (uint256) {
        // (a + b - 1) / b can overflow on addition, so we distribute.
        return a == 0 ? 0 : (a - 1) / b + 1;
    }

    /**
     * @notice Calculates floor(x * y / denominator) with full precision. Throws if result overflows a uint256 or denominator == 0
     * @dev Original credit to Remco Bloemen under MIT license (https://xn--2-umb.com/21/muldiv)
     * with further edits by Uniswap Labs also under MIT license.
     */
    function mulDiv(uint256 x, uint256 y, uint256 denominator) internal pure returns (uint256 result) {
        unchecked {
            // 512-bit multiply [prod1 prod0] = x * y. Compute the product mod 2^256 and mod 2^256 - 1, then use
            // use the Chinese Remainder Theorem to reconstruct the 512 bit result. The result is stored in two 256
            // variables such that product = prod1 * 2^256 + prod0.
            uint256 prod0; // Least significant 256 bits of the product
            uint256 prod1; // Most significant 256 bits of the product
            assembly {
                let mm := mulmod(x, y, not(0))
                prod0 := mul(x, y)
                prod1 := sub(sub(mm, prod0), lt(mm, prod0))
            }

            // Handle non-overflow cases, 256 by 256 division.
            if (prod1 == 0) {
                // Solidity will revert if denominator == 0, unlike the div opcode on its own.
                // The surrounding unchecked block does not change this fact.
                // See https://docs.soliditylang.org/en/latest/control-structures.html#checked-or-unchecked-arithmetic.
                return prod0 / denominator;
            }

            // Make sure the result is less than 2^256. Also prevents denominator == 0.
            require(denominator > prod1, "Math: mulDiv overflow");

            ///////////////////////////////////////////////
            // 512 by 256 division.
            ///////////////////////////////////////////////

            // Make division exact by subtracting the remainder from [prod1 prod0].
            uint256 remainder;
            assembly {
                // Compute remainder using mulmod.
                remainder := mulmod(x, y, denominator)

                // Subtract 256 bit number from 512 bit number.
                prod1 := sub(prod1, gt(remainder, prod0))
                prod0 := sub(prod0, remainder)
            }

            // Factor powers of two out of denominator and compute largest power of two divisor of denominator. Always >= 1.
            // See https://cs.stackexchange.com/q/138556/92363.

            // Does not overflow because the denominator cannot be zero at this stage in the function.
            uint256 twos = denominator & (~denominator + 1);
            assembly {
                // Divide denominator by twos.
                denominator := div(denominator, twos)

                // Divide [prod1 prod0] by twos.
                prod0 := div(prod0, twos)

                // Flip twos such that it is 2^256 / twos. If twos is zero, then it becomes one.
                twos := add(div(sub(0, twos), twos), 1)
            }

            // Shift in bits from prod1 into prod0.
            prod0 |= prod1 * twos;

            // Invert denominator mod 2^256. Now that denominator is an odd number, it has an inverse modulo 2^256 such
            // that denominator * inv = 1 mod 2^256. Compute the inverse by starting with a seed that is correct for
            // four bits. That is, denominator * inv = 1 mod 2^4.
            uint256 inverse = (3 * denominator) ^ 2;

            // Use the Newton-Raphson iteration to improve the precision. Thanks to Hensel's lifting lemma, this also works
            // in modular arithmetic, doubling the correct bits in each step.
            inverse *= 2 - denominator * inverse; // inverse mod 2^8
            inverse *= 2 - denominator * inverse; // inverse mod 2^16
            inverse *= 2 - denominator * inverse; // inverse mod 2^32
            inverse *= 2 - denominator * inverse; // inverse mod 2^64
            inverse *= 2 - denominator * inverse; // inverse mod 2^128
            inverse *= 2 - denominator * inverse; // inverse mod 2^256

            // Because the division is now exact we can divide by multiplying with the modular inverse of denominator.
            // This will give us the correct result modulo 2^256. Since the preconditions guarantee that the outcome is
            // less than 2^256, this is the final result. We don't need to compute the high bits of the result and prod1
            // is no longer required.
            result = prod0 * inverse;
            return result;
        }
    }

    /**
     * @notice Calculates x * y / denominator with full precision, following the selected rounding direction.
     */
    function mulDiv(uint256 x, uint256 y, uint256 denominator, Rounding rounding) internal pure returns (uint256) {
        uint256 result = mulDiv(x, y, denominator);
        if (rounding == Rounding.Up && mulmod(x, y, denominator) > 0) {
            result += 1;
        }
        return result;
    }

    /**
     * @dev Returns the square root of a number. If the number is not a perfect square, the value is rounded down.
     *
     * Inspired by Henry S. Warren, Jr.'s "Hacker's Delight" (Chapter 11).
     */
    function sqrt(uint256 a) internal pure returns (uint256) {
        if (a == 0) {
            return 0;
        }

        // For our first guess, we get the biggest power of 2 which is smaller than the square root of the target.
        //
        // We know that the "msb" (most significant bit) of our target number `a` is a power of 2 such that we have
        // `msb(a) <= a < 2*msb(a)`. This value can be written `msb(a)=2**k` with `k=log2(a)`.
        //
        // This can be rewritten `2**log2(a) <= a < 2**(log2(a) + 1)`
        // → `sqrt(2**k) <= sqrt(a) < sqrt(2**(k+1))`
        // → `2**(k/2) <= sqrt(a) < 2**((k+1)/2) <= 2**(k/2 + 1)`
        //
        // Consequently, `2**(log2(a) / 2)` is a good first approximation of `sqrt(a)` with at least 1 correct bit.
        uint256 result = 1 << (log2(a) >> 1);

        // At this point `result` is an estimation with one bit of precision. We know the true value is a uint128,
        // since it is the square root of a uint256. Newton's method converges quadratically (precision doubles at
        // every iteration). We thus need at most 7 iteration to turn our partial result with one bit of precision
        // into the expected uint128 result.
        unchecked {
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            return min(result, a / result);
        }
    }

    /**
     * @notice Calculates sqrt(a), following the selected rounding direction.
     */
    function sqrt(uint256 a, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = sqrt(a);
            return result + (rounding == Rounding.Up && result * result < a ? 1 : 0);
        }
    }

    /**
     * @dev Return the log in base 2, rounded down, of a positive value.
     * Returns 0 if given 0.
     */
    function log2(uint256 value) internal pure returns (uint256) {
        uint256 result = 0;
        unchecked {
            if (value >> 128 > 0) {
                value >>= 128;
                result += 128;
            }
            if (value >> 64 > 0) {
                value >>= 64;
                result += 64;
            }
            if (value >> 32 > 0) {
                value >>= 32;
                result += 32;
            }
            if (value >> 16 > 0) {
                value >>= 16;
                result += 16;
            }
            if (value >> 8 > 0) {
                value >>= 8;
                result += 8;
            }
            if (value >> 4 > 0) {
                value >>= 4;
                result += 4;
            }
            if (value >> 2 > 0) {
                value >>= 2;
                result += 2;
            }
            if (value >> 1 > 0) {
                result += 1;
            }
        }
        return result;
    }

    /**
     * @dev Return the log in base 2, following the selected rounding direction, of a positive value.
     * Returns 0 if given 0.
     */
    function log2(uint256 value, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = log2(value);
            return result + (rounding == Rounding.Up && 1 << result < value ? 1 : 0);
        }
    }

    /**
     * @dev Return the log in base 10, rounded down, of a positive value.
     * Returns 0 if given 0.
     */
    function log10(uint256 value) internal pure returns (uint256) {
        uint256 result = 0;
        unchecked {
            if (value >= 10 ** 64) {
                value /= 10 ** 64;
                result += 64;
            }
            if (value >= 10 ** 32) {
                value /= 10 ** 32;
                result += 32;
            }
            if (value >= 10 ** 16) {
                value /= 10 ** 16;
                result += 16;
            }
            if (value >= 10 ** 8) {
                value /= 10 ** 8;
                result += 8;
            }
            if (value >= 10 ** 4) {
                value /= 10 ** 4;
                result += 4;
            }
            if (value >= 10 ** 2) {
                value /= 10 ** 2;
                result += 2;
            }
            if (value >= 10 ** 1) {
                result += 1;
            }
        }
        return result;
    }

    /**
     * @dev Return the log in base 10, following the selected rounding direction, of a positive value.
     * Returns 0 if given 0.
     */
    function log10(uint256 value, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = log10(value);
            return result + (rounding == Rounding.Up && 10 ** result < value ? 1 : 0);
        }
    }

    /**
     * @dev Return the log in base 256, rounded down, of a positive value.
     * Returns 0 if given 0.
     *
     * Adding one to the result gives the number of pairs of hex symbols needed to represent `value` as a hex string.
     */
    function log256(uint256 value) internal pure returns (uint256) {
        uint256 result = 0;
        unchecked {
            if (value >> 128 > 0) {
                value >>= 128;
                result += 16;
            }
            if (value >> 64 > 0) {
                value >>= 64;
                result += 8;
            }
            if (value >> 32 > 0) {
                value >>= 32;
                result += 4;
            }
            if (value >> 16 > 0) {
                value >>= 16;
                result += 2;
            }
            if (value >> 8 > 0) {
                result += 1;
            }
        }
        return result;
    }

    /**
     * @dev Return the log in base 256, following the selected rounding direction, of a positive value.
     * Returns 0 if given 0.
     */
    function log256(uint256 value, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = log256(value);
            return result + (rounding == Rounding.Up && 1 << (result << 3) < value ? 1 : 0);
        }
    }
}

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

pragma solidity ^0.8.0;

/**
 * @dev Standard signed math utilities missing in the Solidity language.
 */
library SignedMath {
    /**
     * @dev Returns the largest of two signed numbers.
     */
    function max(int256 a, int256 b) internal pure returns (int256) {
        return a > b ? a : b;
    }

    /**
     * @dev Returns the smallest of two signed numbers.
     */
    function min(int256 a, int256 b) internal pure returns (int256) {
        return a < b ? a : b;
    }

    /**
     * @dev Returns the average of two signed numbers without overflow.
     * The result is rounded towards zero.
     */
    function average(int256 a, int256 b) internal pure returns (int256) {
        // Formula from the book "Hacker's Delight"
        int256 x = (a & b) + ((a ^ b) >> 1);
        return x + (int256(uint256(x) >> 255) & (a ^ b));
    }

    /**
     * @dev Returns the absolute unsigned value of a signed value.
     */
    function abs(int256 n) internal pure returns (uint256) {
        unchecked {
            // must be unchecked in order to support `n = type(int256).min`
            return uint256(n >= 0 ? n : -n);
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (utils/Strings.sol)

pragma solidity ^0.8.0;

import "./math/Math.sol";
import "./math/SignedMath.sol";

/**
 * @dev String operations.
 */
library Strings {
    bytes16 private constant _SYMBOLS = "0123456789abcdef";
    uint8 private constant _ADDRESS_LENGTH = 20;

    /**
     * @dev Converts a `uint256` to its ASCII `string` decimal representation.
     */
    function toString(uint256 value) internal pure returns (string memory) {
        unchecked {
            uint256 length = Math.log10(value) + 1;
            string memory buffer = new string(length);
            uint256 ptr;
            /// @solidity memory-safe-assembly
            assembly {
                ptr := add(buffer, add(32, length))
            }
            while (true) {
                ptr--;
                /// @solidity memory-safe-assembly
                assembly {
                    mstore8(ptr, byte(mod(value, 10), _SYMBOLS))
                }
                value /= 10;
                if (value == 0) break;
            }
            return buffer;
        }
    }

    /**
     * @dev Converts a `int256` to its ASCII `string` decimal representation.
     */
    function toString(int256 value) internal pure returns (string memory) {
        return string(abi.encodePacked(value < 0 ? "-" : "", toString(SignedMath.abs(value))));
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.
     */
    function toHexString(uint256 value) internal pure returns (string memory) {
        unchecked {
            return toHexString(value, Math.log256(value) + 1);
        }
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length.
     */
    function toHexString(uint256 value, uint256 length) internal pure returns (string memory) {
        bytes memory buffer = new bytes(2 * length + 2);
        buffer[0] = "0";
        buffer[1] = "x";
        for (uint256 i = 2 * length + 1; i > 1; --i) {
            buffer[i] = _SYMBOLS[value & 0xf];
            value >>= 4;
        }
        require(value == 0, "Strings: hex length insufficient");
        return string(buffer);
    }

    /**
     * @dev Converts an `address` with fixed length of 20 bytes to its not checksummed ASCII `string` hexadecimal representation.
     */
    function toHexString(address addr) internal pure returns (string memory) {
        return toHexString(uint256(uint160(addr)), _ADDRESS_LENGTH);
    }

    /**
     * @dev Returns true if the two strings are equal.
     */
    function equal(string memory a, string memory b) internal pure returns (bool) {
        return keccak256(bytes(a)) == keccak256(bytes(b));
    }
}

// SPDX-License-Identifier: Unlicense
/*
 * @title Solidity Bytes Arrays Utils
 * @author Gonçalo Sá <[email protected]>
 *
 * @dev Bytes tightly packed arrays utility library for ethereum contracts written in Solidity.
 *      The library lets you concatenate, slice and type cast bytes arrays both in memory and storage.
 */
pragma solidity >=0.8.0 <0.9.0;

library BytesLib {
  function concat(
    bytes memory _preBytes,
    bytes memory _postBytes
  ) internal pure returns (bytes memory) {
    bytes memory tempBytes;

    assembly {
      // Get a location of some free memory and store it in tempBytes as
      // Solidity does for memory variables.
      tempBytes := mload(0x40)

      // Store the length of the first bytes array at the beginning of
      // the memory for tempBytes.
      let length := mload(_preBytes)
      mstore(tempBytes, length)

      // Maintain a memory counter for the current write location in the
      // temp bytes array by adding the 32 bytes for the array length to
      // the starting location.
      let mc := add(tempBytes, 0x20)
      // Stop copying when the memory counter reaches the length of the
      // first bytes array.
      let end := add(mc, length)

      for {
        // Initialize a copy counter to the start of the _preBytes data,
        // 32 bytes into its memory.
        let cc := add(_preBytes, 0x20)
      } lt(mc, end) {
        // Increase both counters by 32 bytes each iteration.
        mc := add(mc, 0x20)
        cc := add(cc, 0x20)
      } {
        // Write the _preBytes data into the tempBytes memory 32 bytes
        // at a time.
        mstore(mc, mload(cc))
      }

      // Add the length of _postBytes to the current length of tempBytes
      // and store it as the new length in the first 32 bytes of the
      // tempBytes memory.
      length := mload(_postBytes)
      mstore(tempBytes, add(length, mload(tempBytes)))

      // Move the memory counter back from a multiple of 0x20 to the
      // actual end of the _preBytes data.
      mc := end
      // Stop copying when the memory counter reaches the new combined
      // length of the arrays.
      end := add(mc, length)

      for {
        let cc := add(_postBytes, 0x20)
      } lt(mc, end) {
        mc := add(mc, 0x20)
        cc := add(cc, 0x20)
      } {
        mstore(mc, mload(cc))
      }

      // Update the free-memory pointer by padding our last write location
      // to 32 bytes: add 31 bytes to the end of tempBytes to move to the
      // next 32 byte block, then round down to the nearest multiple of
      // 32. If the sum of the length of the two arrays is zero then add
      // one before rounding down to leave a blank 32 bytes (the length block with 0).
      mstore(
        0x40,
        and(
          add(add(end, iszero(add(length, mload(_preBytes)))), 31),
          not(31) // Round down to the nearest 32 bytes.
        )
      )
    }

    return tempBytes;
  }

  function concatStorage(
    bytes storage _preBytes,
    bytes memory _postBytes
  ) internal {
    assembly {
      // Read the first 32 bytes of _preBytes storage, which is the length
      // of the array. (We don't need to use the offset into the slot
      // because arrays use the entire slot.)
      let fslot := sload(_preBytes.slot)
      // Arrays of 31 bytes or less have an even value in their slot,
      // while longer arrays have an odd value. The actual length is
      // the slot divided by two for odd values, and the lowest order
      // byte divided by two for even values.
      // If the slot is even, bitwise and the slot with 255 and divide by
      // two to get the length. If the slot is odd, bitwise and the slot
      // with -1 and divide by two.
      let slength := div(
        and(fslot, sub(mul(0x100, iszero(and(fslot, 1))), 1)),
        2
      )
      let mlength := mload(_postBytes)
      let newlength := add(slength, mlength)
      // slength can contain both the length and contents of the array
      // if length < 32 bytes so let's prepare for that
      // v. http://solidity.readthedocs.io/en/latest/miscellaneous.html#layout-of-state-variables-in-storage
      switch add(lt(slength, 32), lt(newlength, 32))
      case 2 {
        // Since the new array still fits in the slot, we just need to
        // update the contents of the slot.
        // uint256(bytes_storage) = uint256(bytes_storage) + uint256(bytes_memory) + new_length
        sstore(
          _preBytes.slot,
          // all the modifications to the slot are inside this
          // next block
          add(
            // we can just add to the slot contents because the
            // bytes we want to change are the LSBs
            fslot,
            add(
              mul(
                div(
                  // load the bytes from memory
                  mload(add(_postBytes, 0x20)),
                  // zero all bytes to the right
                  exp(0x100, sub(32, mlength))
                ),
                // and now shift left the number of bytes to
                // leave space for the length in the slot
                exp(0x100, sub(32, newlength))
              ),
              // increase length by the double of the memory
              // bytes length
              mul(mlength, 2)
            )
          )
        )
      }
      case 1 {
        // The stored value fits in the slot, but the combined value
        // will exceed it.
        // get the keccak hash to get the contents of the array
        mstore(0x0, _preBytes.slot)
        let sc := add(keccak256(0x0, 0x20), div(slength, 32))

        // save new length
        sstore(_preBytes.slot, add(mul(newlength, 2), 1))

        // The contents of the _postBytes array start 32 bytes into
        // the structure. Our first read should obtain the `submod`
        // bytes that can fit into the unused space in the last word
        // of the stored array. To get this, we read 32 bytes starting
        // from `submod`, so the data we read overlaps with the array
        // contents by `submod` bytes. Masking the lowest-order
        // `submod` bytes allows us to add that value directly to the
        // stored value.

        let submod := sub(32, slength)
        let mc := add(_postBytes, submod)
        let end := add(_postBytes, mlength)
        let mask := sub(exp(0x100, submod), 1)

        sstore(
          sc,
          add(
            and(
              fslot,
              0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff00
            ),
            and(mload(mc), mask)
          )
        )

        for {
          mc := add(mc, 0x20)
          sc := add(sc, 1)
        } lt(mc, end) {
          sc := add(sc, 1)
          mc := add(mc, 0x20)
        } {
          sstore(sc, mload(mc))
        }

        mask := exp(0x100, sub(mc, end))

        sstore(sc, mul(div(mload(mc), mask), mask))
      }
      default {
        // get the keccak hash to get the contents of the array
        mstore(0x0, _preBytes.slot)
        // Start copying to the last used word of the stored array.
        let sc := add(keccak256(0x0, 0x20), div(slength, 32))

        // save new length
        sstore(_preBytes.slot, add(mul(newlength, 2), 1))

        // Copy over the first `submod` bytes of the new data as in
        // case 1 above.
        let slengthmod := mod(slength, 32)
        let mlengthmod := mod(mlength, 32)
        let submod := sub(32, slengthmod)
        let mc := add(_postBytes, submod)
        let end := add(_postBytes, mlength)
        let mask := sub(exp(0x100, submod), 1)

        sstore(sc, add(sload(sc), and(mload(mc), mask)))

        for {
          sc := add(sc, 1)
          mc := add(mc, 0x20)
        } lt(mc, end) {
          sc := add(sc, 1)
          mc := add(mc, 0x20)
        } {
          sstore(sc, mload(mc))
        }

        mask := exp(0x100, sub(mc, end))

        sstore(sc, mul(div(mload(mc), mask), mask))
      }
    }
  }

  function slice(
    bytes memory _bytes,
    uint _start,
    uint _length
  ) internal pure returns (bytes memory) {
    require(_length + 31 >= _length, "slice_overflow");
    require(_bytes.length >= _start + _length, "slice_outOfBounds");

    bytes memory tempBytes;

    assembly {
      switch iszero(_length)
      case 0 {
        // Get a location of some free memory and store it in tempBytes as
        // Solidity does for memory variables.
        tempBytes := mload(0x40)

        // The first word of the slice result is potentially a partial
        // word read from the original array. To read it, we calculate
        // the length of that partial word and start copying that many
        // bytes into the array. The first word we copy will start with
        // data we don't care about, but the last `lengthmod` bytes will
        // land at the beginning of the contents of the new array. When
        // we're done copying, we overwrite the full first word with
        // the actual length of the slice.
        let lengthmod := and(_length, 31)

        // The multiplication in the next line is necessary
        // because when slicing multiples of 32 bytes (lengthmod == 0)
        // the following copy loop was copying the origin's length
        // and then ending prematurely not copying everything it should.
        let mc := add(add(tempBytes, lengthmod), mul(0x20, iszero(lengthmod)))
        let end := add(mc, _length)

        for {
          // The multiplication in the next line has the same exact purpose
          // as the one above.
          let cc := add(
            add(add(_bytes, lengthmod), mul(0x20, iszero(lengthmod))),
            _start
          )
        } lt(mc, end) {
          mc := add(mc, 0x20)
          cc := add(cc, 0x20)
        } {
          mstore(mc, mload(cc))
        }

        mstore(tempBytes, _length)

        //update free-memory pointer
        //allocating the array padded to 32 bytes like the compiler does now
        mstore(0x40, and(add(mc, 31), not(31)))
      }
      //if we want a zero-length slice let's just return a zero-length array
      default {
        tempBytes := mload(0x40)
        //zero out the 32 bytes slice we are about to return
        //we need to do it because Solidity does not garbage collect
        mstore(tempBytes, 0)

        mstore(0x40, add(tempBytes, 0x20))
      }
    }

    return tempBytes;
  }

  function toAddress(
    bytes memory _bytes,
    uint _start
  ) internal pure returns (address) {
    require(_bytes.length >= _start + 20, "toAddress_outOfBounds");
    address tempAddress;

    assembly {
      tempAddress := div(
        mload(add(add(_bytes, 0x20), _start)),
        0x1000000000000000000000000
      )
    }

    return tempAddress;
  }

  function toUint8(
    bytes memory _bytes,
    uint _start
  ) internal pure returns (uint8) {
    require(_bytes.length >= _start + 1, "toUint8_outOfBounds");
    uint8 tempUint;

    assembly {
      tempUint := mload(add(add(_bytes, 0x1), _start))
    }

    return tempUint;
  }

  function toUint16(
    bytes memory _bytes,
    uint _start
  ) internal pure returns (uint16) {
    require(_bytes.length >= _start + 2, "toUint16_outOfBounds");
    uint16 tempUint;

    assembly {
      tempUint := mload(add(add(_bytes, 0x2), _start))
    }

    return tempUint;
  }

  function toUint32(
    bytes memory _bytes,
    uint _start
  ) internal pure returns (uint32) {
    require(_bytes.length >= _start + 4, "toUint32_outOfBounds");
    uint32 tempUint;

    assembly {
      tempUint := mload(add(add(_bytes, 0x4), _start))
    }

    return tempUint;
  }

  function toUint64(
    bytes memory _bytes,
    uint _start
  ) internal pure returns (uint64) {
    require(_bytes.length >= _start + 8, "toUint64_outOfBounds");
    uint64 tempUint;

    assembly {
      tempUint := mload(add(add(_bytes, 0x8), _start))
    }

    return tempUint;
  }

  function toUint96(
    bytes memory _bytes,
    uint _start
  ) internal pure returns (uint96) {
    require(_bytes.length >= _start + 12, "toUint96_outOfBounds");
    uint96 tempUint;

    assembly {
      tempUint := mload(add(add(_bytes, 0xc), _start))
    }

    return tempUint;
  }

  function toUint128(
    bytes memory _bytes,
    uint _start
  ) internal pure returns (uint128) {
    require(_bytes.length >= _start + 16, "toUint128_outOfBounds");
    uint128 tempUint;

    assembly {
      tempUint := mload(add(add(_bytes, 0x10), _start))
    }

    return tempUint;
  }

  function toUint256(
    bytes memory _bytes,
    uint _start
  ) internal pure returns (uint) {
    require(_bytes.length >= _start + 32, "toUint256_outOfBounds");
    uint tempUint;

    assembly {
      tempUint := mload(add(add(_bytes, 0x20), _start))
    }

    return tempUint;
  }

  function toBytes32(
    bytes memory _bytes,
    uint _start
  ) internal pure returns (bytes32) {
    require(_bytes.length >= _start + 32, "toBytes32_outOfBounds");
    bytes32 tempBytes32;

    assembly {
      tempBytes32 := mload(add(add(_bytes, 0x20), _start))
    }

    return tempBytes32;
  }

  function equal(
    bytes memory _preBytes,
    bytes memory _postBytes
  ) internal pure returns (bool) {
    bool success = true;

    assembly {
      let length := mload(_preBytes)

      // if lengths don't match the arrays are not equal
      switch eq(length, mload(_postBytes))
      case 1 {
        // cb is a circuit breaker in the for loop since there's
        //  no said feature for inline assembly loops
        // cb = 1 - don't breaker
        // cb = 0 - break
        let cb := 1

        let mc := add(_preBytes, 0x20)
        let end := add(mc, length)

        for {
          let cc := add(_postBytes, 0x20)
          // the next line is the loop condition:
          // while(uint256(mc < end) + cb == 2)
        } eq(add(lt(mc, end), cb), 2) {
          mc := add(mc, 0x20)
          cc := add(cc, 0x20)
        } {
          // if any of these checks fails then arrays are not equal
          if iszero(eq(mload(mc), mload(cc))) {
            // unsuccess:
            success := 0
            cb := 0
          }
        }
      }
      default {
        // unsuccess:
        success := 0
      }
    }

    return success;
  }

  function equalStorage(
    bytes storage _preBytes,
    bytes memory _postBytes
  ) internal view returns (bool) {
    bool success = true;

    assembly {
      // we know _preBytes_offset is 0
      let fslot := sload(_preBytes.slot)
      // Decode the length of the stored array like in concatStorage().
      let slength := div(
        and(fslot, sub(mul(0x100, iszero(and(fslot, 1))), 1)),
        2
      )
      let mlength := mload(_postBytes)

      // if lengths don't match the arrays are not equal
      switch eq(slength, mlength)
      case 1 {
        // slength can contain both the length and contents of the array
        // if length < 32 bytes so let's prepare for that
        // v. http://solidity.readthedocs.io/en/latest/miscellaneous.html#layout-of-state-variables-in-storage
        if iszero(iszero(slength)) {
          switch lt(slength, 32)
          case 1 {
            // blank the last byte which is the length
            fslot := mul(div(fslot, 0x100), 0x100)

            if iszero(eq(fslot, mload(add(_postBytes, 0x20)))) {
              // unsuccess:
              success := 0
            }
          }
          default {
            // cb is a circuit breaker in the for loop since there's
            //  no said feature for inline assembly loops
            // cb = 1 - don't breaker
            // cb = 0 - break
            let cb := 1

            // get the keccak hash to get the contents of the array
            mstore(0x0, _preBytes.slot)
            let sc := keccak256(0x0, 0x20)

            let mc := add(_postBytes, 0x20)
            let end := add(mc, mlength)

            // the next line is the loop condition:
            // while(uint256(mc < end) + cb == 2)
            for {

            } eq(add(lt(mc, end), cb), 2) {
              sc := add(sc, 1)
              mc := add(mc, 0x20)
            } {
              if iszero(eq(sload(sc), mload(mc))) {
                // unsuccess:
                success := 0
                cb := 0
              }
            }
          }
        }
      }
      default {
        // unsuccess:
        success := 0
      }
    }

    return success;
  }
}

// SPDX-License-Identifier: MIT OR Apache-2.0
pragma solidity >=0.7.6;

library ExcessivelySafeCall {
  uint constant LOW_28_MASK =
    0x00000000ffffffffffffffffffffffffffffffffffffffffffffffffffffffff;

  /// @notice Use when you _really_ really _really_ don't trust the called
  /// contract. This prevents the called contract from causing reversion of
  /// the caller in as many ways as we can.
  /// @dev The main difference between this and a solidity low-level call is
  /// that we limit the number of bytes that the callee can cause to be
  /// copied to caller memory. This prevents stupid things like malicious
  /// contracts returning 10,000,000 bytes causing a local OOG when copying
  /// to memory.
  /// @param _target The address to call
  /// @param _gas The amount of gas to forward to the remote contract
  /// @param _maxCopy The maximum number of bytes of returndata to copy
  /// to memory.
  /// @param _calldata The data to send to the remote contract
  /// @return success and returndata, as `.call()`. Returndata is capped to
  /// `_maxCopy` bytes.
  function excessivelySafeCall(
    address _target,
    uint _gas,
    uint16 _maxCopy,
    bytes memory _calldata
  ) internal returns (bool, bytes memory) {
    // set up for assembly call
    uint _toCopy;
    bool _success;
    bytes memory _returnData = new bytes(_maxCopy);
    // dispatch message to recipient
    // by assembly calling "handle" function
    // we call via assembly to avoid memcopying a very large returndata
    // returned by a malicious contract
    assembly {
      _success := call(
        _gas, // gas
        _target, // recipient
        0, // ether value
        add(_calldata, 0x20), // inloc
        mload(_calldata), // inlen
        0, // outloc
        0 // outlen
      )
      // limit our copy to 256 bytes
      _toCopy := returndatasize()
      if gt(_toCopy, _maxCopy) {
        _toCopy := _maxCopy
      }
      // Store the length of the copied bytes
      mstore(_returnData, _toCopy)
      // copy the bytes from returndata[0:_toCopy]
      returndatacopy(add(_returnData, 0x20), 0, _toCopy)
    }
    return (_success, _returnData);
  }

  /// @notice Use when you _really_ really _really_ don't trust the called
  /// contract. This prevents the called contract from causing reversion of
  /// the caller in as many ways as we can.
  /// @dev The main difference between this and a solidity low-level call is
  /// that we limit the number of bytes that the callee can cause to be
  /// copied to caller memory. This prevents stupid things like malicious
  /// contracts returning 10,000,000 bytes causing a local OOG when copying
  /// to memory.
  /// @param _target The address to call
  /// @param _gas The amount of gas to forward to the remote contract
  /// @param _maxCopy The maximum number of bytes of returndata to copy
  /// to memory.
  /// @param _calldata The data to send to the remote contract
  /// @return success and returndata, as `.call()`. Returndata is capped to
  /// `_maxCopy` bytes.
  function excessivelySafeStaticCall(
    address _target,
    uint _gas,
    uint16 _maxCopy,
    bytes memory _calldata
  ) internal view returns (bool, bytes memory) {
    // set up for assembly call
    uint _toCopy;
    bool _success;
    bytes memory _returnData = new bytes(_maxCopy);
    // dispatch message to recipient
    // by assembly calling "handle" function
    // we call via assembly to avoid memcopying a very large returndata
    // returned by a malicious contract
    assembly {
      _success := staticcall(
        _gas, // gas
        _target, // recipient
        add(_calldata, 0x20), // inloc
        mload(_calldata), // inlen
        0, // outloc
        0 // outlen
      )
      // limit our copy to 256 bytes
      _toCopy := returndatasize()
      if gt(_toCopy, _maxCopy) {
        _toCopy := _maxCopy
      }
      // Store the length of the copied bytes
      mstore(_returnData, _toCopy)
      // copy the bytes from returndata[0:_toCopy]
      returndatacopy(add(_returnData, 0x20), 0, _toCopy)
    }
    return (_success, _returnData);
  }

  /**
   * @notice Swaps function selectors in encoded contract calls
   * @dev Allows reuse of encoded calldata for functions with identical
   * argument types but different names. It simply swaps out the first 4 bytes
   * for the new selector. This function modifies memory in place, and should
   * only be used with caution.
   * @param _newSelector The new 4-byte selector
   * @param _buf The encoded contract args
   */
  function swapSelector(bytes4 _newSelector, bytes memory _buf) internal pure {
    require(_buf.length >= 4);
    uint _mask = LOW_28_MASK;
    assembly {
      // load the first word of
      let _word := mload(add(_buf, 0x20))
      // mask out the top 4 bytes
      // /x
      _word := and(_word, _mask)
      _word := or(_newSelector, _word)
      mstore(add(_buf, 0x20), _word)
    }
  }
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.5.0;

import "./ILayerZeroUserApplicationConfig.sol";

interface ILayerZeroEndpoint is ILayerZeroUserApplicationConfig {
  // @notice send a LayerZero message to the specified address at a LayerZero endpoint.
  // @param _dstChainId - the destination chain identifier
  // @param _destination - the address on destination chain (in bytes). address length/format may vary by chains
  // @param _payload - a custom bytes payload to send to the destination contract
  // @param _refundAddress - if the source transaction is cheaper than the amount of value passed, refund the additional amount to this address
  // @param _zroPaymentAddress - the address of the ZRO token holder who would pay for the transaction
  // @param _adapterParams - parameters for custom functionality. e.g. receive airdropped native gas from the relayer on destination
  function send(
    uint16 _dstChainId,
    bytes calldata _destination,
    bytes calldata _payload,
    address payable _refundAddress,
    address _zroPaymentAddress,
    bytes calldata _adapterParams
  ) external payable;

  // @notice used by the messaging library to publish verified payload
  // @param _srcChainId - the source chain identifier
  // @param _srcAddress - the source contract (as bytes) at the source chain
  // @param _dstAddress - the address on destination chain
  // @param _nonce - the unbound message ordering nonce
  // @param _gasLimit - the gas limit for external contract execution
  // @param _payload - verified payload to send to the destination contract
  function receivePayload(
    uint16 _srcChainId,
    bytes calldata _srcAddress,
    address _dstAddress,
    uint64 _nonce,
    uint _gasLimit,
    bytes calldata _payload
  ) external;

  // @notice get the inboundNonce of a lzApp from a source chain which could be EVM or non-EVM chain
  // @param _srcChainId - the source chain identifier
  // @param _srcAddress - the source chain contract address
  function getInboundNonce(
    uint16 _srcChainId,
    bytes calldata _srcAddress
  ) external view returns (uint64);

  // @notice get the outboundNonce from this source chain which, consequently, is always an EVM
  // @param _srcAddress - the source chain contract address
  function getOutboundNonce(
    uint16 _dstChainId,
    address _srcAddress
  ) external view returns (uint64);

  // @notice gets a quote in source native gas, for the amount that send() requires to pay for message delivery
  // @param _dstChainId - the destination chain identifier
  // @param _userApplication - the user app address on this EVM chain
  // @param _payload - the custom message to send over LayerZero
  // @param _payInZRO - if false, user app pays the protocol fee in native token
  // @param _adapterParam - parameters for the adapter service, e.g. send some dust native token to dstChain
  function estimateFees(
    uint16 _dstChainId,
    address _userApplication,
    bytes calldata _payload,
    bool _payInZRO,
    bytes calldata _adapterParam
  ) external view returns (uint nativeFee, uint zroFee);

  // @notice get this Endpoint's immutable source identifier
  function getChainId() external view returns (uint16);

  // @notice the interface to retry failed message on this Endpoint destination
  // @param _srcChainId - the source chain identifier
  // @param _srcAddress - the source chain contract address
  // @param _payload - the payload to be retried
  function retryPayload(
    uint16 _srcChainId,
    bytes calldata _srcAddress,
    bytes calldata _payload
  ) external;

  // @notice query if any STORED payload (message blocking) at the endpoint.
  // @param _srcChainId - the source chain identifier
  // @param _srcAddress - the source chain contract address
  function hasStoredPayload(
    uint16 _srcChainId,
    bytes calldata _srcAddress
  ) external view returns (bool);

  // @notice query if the _libraryAddress is valid for sending msgs.
  // @param _userApplication - the user app address on this EVM chain
  function getSendLibraryAddress(
    address _userApplication
  ) external view returns (address);

  // @notice query if the _libraryAddress is valid for receiving msgs.
  // @param _userApplication - the user app address on this EVM chain
  function getReceiveLibraryAddress(
    address _userApplication
  ) external view returns (address);

  // @notice query if the non-reentrancy guard for send() is on
  // @return true if the guard is on. false otherwise
  function isSendingPayload() external view returns (bool);

  // @notice query if the non-reentrancy guard for receive() is on
  // @return true if the guard is on. false otherwise
  function isReceivingPayload() external view returns (bool);

  // @notice get the configuration of the LayerZero messaging library of the specified version
  // @param _version - messaging library version
  // @param _chainId - the chainId for the pending config change
  // @param _userApplication - the contract address of the user application
  // @param _configType - type of configuration. every messaging library has its own convention.
  function getConfig(
    uint16 _version,
    uint16 _chainId,
    address _userApplication,
    uint _configType
  ) external view returns (bytes memory);

  // @notice get the send() LayerZero messaging library version
  // @param _userApplication - the contract address of the user application
  function getSendVersion(
    address _userApplication
  ) external view returns (uint16);

  // @notice get the lzReceive() LayerZero messaging library version
  // @param _userApplication - the contract address of the user application
  function getReceiveVersion(
    address _userApplication
  ) external view returns (uint16);
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.5.0;

interface ILayerZeroReceiver {
  // @notice LayerZero endpoint will invoke this function to deliver the message on the destination
  // @param _srcChainId - the source endpoint identifier
  // @param _srcAddress - the source sending contract address from the source chain
  // @param _nonce - the ordered message nonce
  // @param _payload - the signed payload is the UA bytes has encoded to be sent
  function lzReceive(
    uint16 _srcChainId,
    bytes calldata _srcAddress,
    uint64 _nonce,
    bytes calldata _payload
  ) external;
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.5.0;

interface ILayerZeroUserApplicationConfig {
  // @notice set the configuration of the LayerZero messaging library of the specified version
  // @param _version - messaging library version
  // @param _chainId - the chainId for the pending config change
  // @param _configType - type of configuration. every messaging library has its own convention.
  // @param _config - configuration in the bytes. can encode arbitrary content.
  function setConfig(
    uint16 _version,
    uint16 _chainId,
    uint _configType,
    bytes calldata _config
  ) external;

  // @notice set the send() LayerZero messaging library version to _version
  // @param _version - new messaging library version
  function setSendVersion(uint16 _version) external;

  // @notice set the lzReceive() LayerZero messaging library version to _version
  // @param _version - new messaging library version
  function setReceiveVersion(uint16 _version) external;

  // @notice Only when the UA needs to resume the message flow in blocking mode and clear the stored payload
  // @param _srcChainId - the chainId of the source chain
  // @param _srcAddress - the contract address of the source contract at the source chain
  function forceResumeReceive(
    uint16 _srcChainId,
    bytes calldata _srcAddress
  ) external;
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "@openzeppelin/contracts/access/Ownable.sol";
import "./interfaces/ILayerZeroReceiver.sol";
import "./interfaces/ILayerZeroUserApplicationConfig.sol";
import "./interfaces/ILayerZeroEndpoint.sol";
import "../libraries/BytesLib.sol";

/*
 * a generic LzReceiver implementation
 */
abstract contract LzApp is
  Ownable,
  ILayerZeroReceiver,
  ILayerZeroUserApplicationConfig
{
  using BytesLib for bytes;

  // ua can not send payload larger than this by default, but it can be changed by the ua owner
  uint public constant DEFAULT_PAYLOAD_SIZE_LIMIT = 10000;

  ILayerZeroEndpoint public immutable lzEndpoint;
  mapping(uint16 => bytes) public trustedRemoteLookup;
  mapping(uint16 => mapping(uint16 => uint)) public minDstGasLookup;
  mapping(uint16 => uint) public payloadSizeLimitLookup;
  address public precrime;

  event SetPrecrime(address precrime);
  event SetTrustedRemote(uint16 _remoteChainId, bytes _path);
  event SetTrustedRemoteAddress(uint16 _remoteChainId, bytes _remoteAddress);
  event SetMinDstGas(uint16 _dstChainId, uint16 _type, uint _minDstGas);

  constructor(address _endpoint) {
    lzEndpoint = ILayerZeroEndpoint(_endpoint);
  }

  function lzReceive(
    uint16 _srcChainId,
    bytes calldata _srcAddress,
    uint64 _nonce,
    bytes calldata _payload
  ) public virtual override {
    // lzReceive must be called by the endpoint for security
    require(
      _msgSender() == address(lzEndpoint),
      "LzApp: invalid endpoint caller"
    );

    bytes memory trustedRemote = trustedRemoteLookup[_srcChainId];
    // if will still block the message pathway from (srcChainId, srcAddress). should not receive message from untrusted remote.
    require(
      _srcAddress.length == trustedRemote.length &&
        trustedRemote.length > 0 &&
        keccak256(_srcAddress) == keccak256(trustedRemote),
      "LzApp: invalid source sending contract"
    );

    _blockingLzReceive(_srcChainId, _srcAddress, _nonce, _payload);
  }

  // abstract function - the default behaviour of LayerZero is blocking. See: NonblockingLzApp if you dont need to enforce ordered messaging
  function _blockingLzReceive(
    uint16 _srcChainId,
    bytes memory _srcAddress,
    uint64 _nonce,
    bytes memory _payload
  ) internal virtual;

  function _lzSend(
    uint16 _dstChainId,
    bytes memory _payload,
    address payable _refundAddress,
    address _zroPaymentAddress,
    bytes memory _adapterParams,
    uint _nativeFee
  ) internal virtual {
    bytes memory trustedRemote = trustedRemoteLookup[_dstChainId];
    require(
      trustedRemote.length != 0,
      "LzApp: destination chain is not a trusted source"
    );
    _checkPayloadSize(_dstChainId, _payload.length);
    lzEndpoint.send{value: _nativeFee}(
      _dstChainId,
      trustedRemote,
      _payload,
      _refundAddress,
      _zroPaymentAddress,
      _adapterParams
    );
  }

  function _checkGasLimit(
    uint16 _dstChainId,
    uint16 _type,
    bytes memory _adapterParams,
    uint _extraGas
  ) internal view virtual {
    uint providedGasLimit = _getGasLimit(_adapterParams);
    uint minGasLimit = minDstGasLookup[_dstChainId][_type];
    require(minGasLimit > 0, "LzApp: minGasLimit not set");
    require(
      providedGasLimit >= minGasLimit + _extraGas,
      "LzApp: gas limit is too low"
    );
  }

  function _getGasLimit(
    bytes memory _adapterParams
  ) internal pure virtual returns (uint gasLimit) {
    require(_adapterParams.length >= 34, "LzApp: invalid adapterParams");
    assembly {
      gasLimit := mload(add(_adapterParams, 34))
    }
  }

  function _checkPayloadSize(
    uint16 _dstChainId,
    uint _payloadSize
  ) internal view virtual {
    uint payloadSizeLimit = payloadSizeLimitLookup[_dstChainId];
    if (payloadSizeLimit == 0) {
      // use default if not set
      payloadSizeLimit = DEFAULT_PAYLOAD_SIZE_LIMIT;
    }
    require(
      _payloadSize <= payloadSizeLimit,
      "LzApp: payload size is too large"
    );
  }

  //---------------------------UserApplication config----------------------------------------
  function getConfig(
    uint16 _version,
    uint16 _chainId,
    address,
    uint _configType
  ) external view returns (bytes memory) {
    return lzEndpoint.getConfig(_version, _chainId, address(this), _configType);
  }

  // generic config for LayerZero user Application
  function setConfig(
    uint16 _version,
    uint16 _chainId,
    uint _configType,
    bytes calldata _config
  ) external override onlyOwner {
    lzEndpoint.setConfig(_version, _chainId, _configType, _config);
  }

  function setSendVersion(uint16 _version) external override onlyOwner {
    lzEndpoint.setSendVersion(_version);
  }

  function setReceiveVersion(uint16 _version) external override onlyOwner {
    lzEndpoint.setReceiveVersion(_version);
  }

  function forceResumeReceive(
    uint16 _srcChainId,
    bytes calldata _srcAddress
  ) external override onlyOwner {
    lzEndpoint.forceResumeReceive(_srcChainId, _srcAddress);
  }

  // _path = abi.encodePacked(remoteAddress, localAddress)
  // this function set the trusted path for the cross-chain communication
  function setTrustedRemote(
    uint16 _remoteChainId,
    bytes calldata _path
  ) external onlyOwner {
    trustedRemoteLookup[_remoteChainId] = _path;
    emit SetTrustedRemote(_remoteChainId, _path);
  }

  function setTrustedRemoteAddress(
    uint16 _remoteChainId,
    bytes calldata _remoteAddress
  ) external onlyOwner {
    trustedRemoteLookup[_remoteChainId] = abi.encodePacked(
      _remoteAddress,
      address(this)
    );
    emit SetTrustedRemoteAddress(_remoteChainId, _remoteAddress);
  }

  function getTrustedRemoteAddress(
    uint16 _remoteChainId
  ) external view returns (bytes memory) {
    bytes memory path = trustedRemoteLookup[_remoteChainId];
    require(path.length != 0, "LzApp: no trusted path record");
    return path.slice(0, path.length - 20); // the last 20 bytes should be address(this)
  }

  function setPrecrime(address _precrime) external onlyOwner {
    precrime = _precrime;
    emit SetPrecrime(_precrime);
  }

  function setMinDstGas(
    uint16 _dstChainId,
    uint16 _packetType,
    uint _minGas
  ) external onlyOwner {
    minDstGasLookup[_dstChainId][_packetType] = _minGas;
    emit SetMinDstGas(_dstChainId, _packetType, _minGas);
  }

  // if the size is 0, it means default size limit
  function setPayloadSizeLimit(
    uint16 _dstChainId,
    uint _size
  ) external onlyOwner {
    payloadSizeLimitLookup[_dstChainId] = _size;
  }

  //--------------------------- VIEW FUNCTION ----------------------------------------
  function isTrustedRemote(
    uint16 _srcChainId,
    bytes calldata _srcAddress
  ) external view returns (bool) {
    bytes memory trustedSource = trustedRemoteLookup[_srcChainId];
    return keccak256(trustedSource) == keccak256(_srcAddress);
  }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "./LzApp.sol";
import "../libraries/ExcessivelySafeCall.sol";

/*
 * the default LayerZero messaging behaviour is blocking, i.e. any failed message will block the channel
 * this abstract class try-catch all fail messages and store locally for future retry. hence, non-blocking
 * NOTE: if the srcAddress is not configured properly, it will still block the message pathway from (srcChainId, srcAddress)
 */
abstract contract NonblockingLzApp is LzApp {
  using ExcessivelySafeCall for address;

  constructor(address _endpoint) LzApp(_endpoint) {}

  mapping(uint16 => mapping(bytes => mapping(uint64 => bytes32)))
    public failedMessages;

  event MessageFailed(
    uint16 _srcChainId,
    bytes _srcAddress,
    uint64 _nonce,
    bytes _payload,
    bytes _reason
  );
  event RetryMessageSuccess(
    uint16 _srcChainId,
    bytes _srcAddress,
    uint64 _nonce,
    bytes32 _payloadHash
  );

  // overriding the virtual function in LzReceiver
  function _blockingLzReceive(
    uint16 _srcChainId,
    bytes memory _srcAddress,
    uint64 _nonce,
    bytes memory _payload
  ) internal virtual override {
    (bool success, bytes memory reason) = address(this).excessivelySafeCall(
      gasleft(),
      150,
      abi.encodeWithSelector(
        this.nonblockingLzReceive.selector,
        _srcChainId,
        _srcAddress,
        _nonce,
        _payload
      )
    );
    if (!success) {
      _storeFailedMessage(_srcChainId, _srcAddress, _nonce, _payload, reason);
    }
  }

  function _storeFailedMessage(
    uint16 _srcChainId,
    bytes memory _srcAddress,
    uint64 _nonce,
    bytes memory _payload,
    bytes memory _reason
  ) internal virtual {
    failedMessages[_srcChainId][_srcAddress][_nonce] = keccak256(_payload);
    emit MessageFailed(_srcChainId, _srcAddress, _nonce, _payload, _reason);
  }

  function nonblockingLzReceive(
    uint16 _srcChainId,
    bytes calldata _srcAddress,
    uint64 _nonce,
    bytes calldata _payload
  ) public virtual {
    // only internal transaction
    require(
      _msgSender() == address(this),
      "NonblockingLzApp: caller must be LzApp"
    );
    _nonblockingLzReceive(_srcChainId, _srcAddress, _nonce, _payload);
  }

  //@notice override this function
  function _nonblockingLzReceive(
    uint16 _srcChainId,
    bytes memory _srcAddress,
    uint64 _nonce,
    bytes memory _payload
  ) internal virtual;

  function retryMessage(
    uint16 _srcChainId,
    bytes calldata _srcAddress,
    uint64 _nonce,
    bytes calldata _payload
  ) public payable virtual {
    // assert there is message to retry
    bytes32 payloadHash = failedMessages[_srcChainId][_srcAddress][_nonce];
    require(payloadHash != bytes32(0), "NonblockingLzApp: no stored message");
    require(
      keccak256(_payload) == payloadHash,
      "NonblockingLzApp: invalid payload"
    );
    // clear the stored message
    failedMessages[_srcChainId][_srcAddress][_nonce] = bytes32(0);
    // execute the message. revert if it fails again
    _nonblockingLzReceive(_srcChainId, _srcAddress, _nonce, _payload);
    emit RetryMessageSuccess(_srcChainId, _srcAddress, _nonce, payloadHash);
  }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "./OFTCoreV2.sol";
import "./interfaces/IOFTV2.sol";
import "@openzeppelin/contracts/utils/introspection/ERC165.sol";

abstract contract BaseOFTV2 is OFTCoreV2, ERC165, IOFTV2 {
  constructor(
    uint8 _sharedDecimals,
    address _lzEndpoint
  ) OFTCoreV2(_sharedDecimals, _lzEndpoint) {}

  /************************************************************************
   * public functions
   ************************************************************************/
  function sendFrom(
    address _from,
    uint16 _dstChainId,
    bytes32 _toAddress,
    uint _amount,
    LzCallParams calldata _callParams
  ) public payable virtual override {
    _send(
      _from,
      _dstChainId,
      _toAddress,
      _amount,
      _callParams.refundAddress,
      _callParams.zroPaymentAddress,
      _callParams.adapterParams
    );
  }

  function sendAndCall(
    address _from,
    uint16 _dstChainId,
    bytes32 _toAddress,
    uint _amount,
    bytes calldata _payload,
    uint64 _dstGasForCall,
    LzCallParams calldata _callParams
  ) public payable virtual override {
    _sendAndCall(
      _from,
      _dstChainId,
      _toAddress,
      _amount,
      _payload,
      _dstGasForCall,
      _callParams.refundAddress,
      _callParams.zroPaymentAddress,
      _callParams.adapterParams
    );
  }

  /************************************************************************
   * public view functions
   ************************************************************************/
  function supportsInterface(
    bytes4 interfaceId
  ) public view virtual override(ERC165, IERC165) returns (bool) {
    return
      interfaceId == type(IOFTV2).interfaceId ||
      super.supportsInterface(interfaceId);
  }

  function estimateSendFee(
    uint16 _dstChainId,
    bytes32 _toAddress,
    uint _amount,
    bool _useZro,
    bytes calldata _adapterParams
  ) public view virtual override returns (uint nativeFee, uint zroFee) {
    return
      _estimateSendFee(
        _dstChainId,
        _toAddress,
        _amount,
        _useZro,
        _adapterParams
      );
  }

  function estimateSendAndCallFee(
    uint16 _dstChainId,
    bytes32 _toAddress,
    uint _amount,
    bytes calldata _payload,
    uint64 _dstGasForCall,
    bool _useZro,
    bytes calldata _adapterParams
  ) public view virtual override returns (uint nativeFee, uint zroFee) {
    return
      _estimateSendAndCallFee(
        _dstChainId,
        _toAddress,
        _amount,
        _payload,
        _dstGasForCall,
        _useZro,
        _adapterParams
      );
  }

  function circulatingSupply() public view virtual override returns (uint);

  function token() public view virtual override returns (address);
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.5.0;

import "@openzeppelin/contracts/utils/introspection/IERC165.sol";

/**
 * @dev Interface of the IOFT core standard
 */
interface ICommonOFT is IERC165 {
  struct LzCallParams {
    address payable refundAddress;
    address zroPaymentAddress;
    bytes adapterParams;
  }

  /**
   * @dev estimate send token `_tokenId` to (`_dstChainId`, `_toAddress`)
   * _dstChainId - L0 defined chain id to send tokens too
   * _toAddress - dynamic bytes array which contains the address to whom you are sending tokens to on the dstChain
   * _amount - amount of the tokens to transfer
   * _useZro - indicates to use zro to pay L0 fees
   * _adapterParam - flexible bytes array to indicate messaging adapter services in L0
   */
  function estimateSendFee(
    uint16 _dstChainId,
    bytes32 _toAddress,
    uint _amount,
    bool _useZro,
    bytes calldata _adapterParams
  ) external view returns (uint nativeFee, uint zroFee);

  function estimateSendAndCallFee(
    uint16 _dstChainId,
    bytes32 _toAddress,
    uint _amount,
    bytes calldata _payload,
    uint64 _dstGasForCall,
    bool _useZro,
    bytes calldata _adapterParams
  ) external view returns (uint nativeFee, uint zroFee);

  /**
   * @dev returns the circulating amount of tokens on current chain
   */
  function circulatingSupply() external view returns (uint);

  /**
   * @dev returns the address of the ERC20 token
   */
  function token() external view returns (address);
}

// SPDX-License-Identifier: BUSL-1.1

pragma solidity >=0.5.0;

interface IOFTReceiverV2 {
  /**
   * @dev Called by the OFT contract when tokens are received from source chain.
   * @param _srcChainId The chain id of the source chain.
   * @param _srcAddress The address of the OFT token contract on the source chain.
   * @param _nonce The nonce of the transaction on the source chain.
   * @param _from The address of the account who calls the sendAndCall() on the source chain.
   * @param _amount The amount of tokens to transfer.
   * @param _payload Additional data with no specified format.
   */
  function onOFTReceived(
    uint16 _srcChainId,
    bytes calldata _srcAddress,
    uint64 _nonce,
    bytes32 _from,
    uint _amount,
    bytes calldata _payload
  ) external;
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.5.0;

import "./ICommonOFT.sol";

/**
 * @dev Interface of the IOFT core standard
 */
interface IOFTV2 is ICommonOFT {
  /**
   * @dev send `_amount` amount of token to (`_dstChainId`, `_toAddress`) from `_from`
   * `_from` the owner of token
   * `_dstChainId` the destination chain identifier
   * `_toAddress` can be any size depending on the `dstChainId`.
   * `_amount` the quantity of tokens in wei
   * `_refundAddress` the address LayerZero refunds if too much message fee is sent
   * `_zroPaymentAddress` set to address(0x0) if not paying in ZRO (LayerZero Token)
   * `_adapterParams` is a flexible bytes array to indicate messaging adapter services
   */
  function sendFrom(
    address _from,
    uint16 _dstChainId,
    bytes32 _toAddress,
    uint _amount,
    LzCallParams calldata _callParams
  ) external payable;

  function sendAndCall(
    address _from,
    uint16 _dstChainId,
    bytes32 _toAddress,
    uint _amount,
    bytes calldata _payload,
    uint64 _dstGasForCall,
    LzCallParams calldata _callParams
  ) external payable;
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "../lzApp/NonblockingLzApp.sol";
import "../libraries/ExcessivelySafeCall.sol";
import "./interfaces/ICommonOFT.sol";
import "./interfaces/IOFTReceiverV2.sol";

abstract contract OFTCoreV2 is NonblockingLzApp {
  using BytesLib for bytes;
  using ExcessivelySafeCall for address;

  uint public constant NO_EXTRA_GAS = 0;

  // packet type
  uint8 public constant PT_SEND = 0;
  uint8 public constant PT_SEND_AND_CALL = 1;

  uint8 public immutable sharedDecimals;

  mapping(uint16 => mapping(bytes => mapping(uint64 => bool)))
    public creditedPackets;

  /**
   * @dev Emitted when `_amount` tokens are moved from the `_sender` to (`_dstChainId`, `_toAddress`)
   * `_nonce` is the outbound nonce
   */
  event SendToChain(
    uint16 indexed _dstChainId,
    address indexed _from,
    bytes32 indexed _toAddress,
    uint _amount
  );

  /**
   * @dev Emitted when `_amount` tokens are received from `_srcChainId` into the `_toAddress` on the local chain.
   * `_nonce` is the inbound nonce.
   */
  event ReceiveFromChain(
    uint16 indexed _srcChainId,
    address indexed _to,
    uint _amount
  );

  event CallOFTReceivedSuccess(
    uint16 indexed _srcChainId,
    bytes _srcAddress,
    uint64 _nonce,
    bytes32 _hash
  );

  event NonContractAddress(address _address);

  // _sharedDecimals should be the minimum decimals on all chains
  constructor(
    uint8 _sharedDecimals,
    address _lzEndpoint
  ) NonblockingLzApp(_lzEndpoint) {
    sharedDecimals = _sharedDecimals;
  }

  /************************************************************************
   * public functions
   ************************************************************************/
  function callOnOFTReceived(
    uint16 _srcChainId,
    bytes calldata _srcAddress,
    uint64 _nonce,
    bytes32 _from,
    address _to,
    uint _amount,
    bytes calldata _payload,
    uint _gasForCall
  ) public virtual {
    require(_msgSender() == address(this), "OFTCore: caller must be OFTCore");

    // send
    _amount = _transferFrom(address(this), _to, _amount);
    emit ReceiveFromChain(_srcChainId, _to, _amount);

    // call
    IOFTReceiverV2(_to).onOFTReceived{gas: _gasForCall}(
      _srcChainId,
      _srcAddress,
      _nonce,
      _from,
      _amount,
      _payload
    );
  }

  /************************************************************************
   * internal functions
   ************************************************************************/
  function _estimateSendFee(
    uint16 _dstChainId,
    bytes32 _toAddress,
    uint _amount,
    bool _useZro,
    bytes memory _adapterParams
  ) internal view virtual returns (uint nativeFee, uint zroFee) {
    // mock the payload for sendFrom()
    bytes memory payload = _encodeSendPayload(_toAddress, _ld2sd(_amount));
    return
      lzEndpoint.estimateFees(
        _dstChainId,
        address(this),
        payload,
        _useZro,
        _adapterParams
      );
  }

  function _estimateSendAndCallFee(
    uint16 _dstChainId,
    bytes32 _toAddress,
    uint _amount,
    bytes memory _payload,
    uint64 _dstGasForCall,
    bool _useZro,
    bytes memory _adapterParams
  ) internal view virtual returns (uint nativeFee, uint zroFee) {
    // mock the payload for sendAndCall()
    bytes memory payload = _encodeSendAndCallPayload(
      msg.sender,
      _toAddress,
      _ld2sd(_amount),
      _payload,
      _dstGasForCall
    );
    return
      lzEndpoint.estimateFees(
        _dstChainId,
        address(this),
        payload,
        _useZro,
        _adapterParams
      );
  }

  function _nonblockingLzReceive(
    uint16 _srcChainId,
    bytes memory _srcAddress,
    uint64 _nonce,
    bytes memory _payload
  ) internal virtual override {
    uint8 packetType = _payload.toUint8(0);

    if (packetType == PT_SEND) {
      _sendAck(_srcChainId, _srcAddress, _nonce, _payload);
    } else if (packetType == PT_SEND_AND_CALL) {
      _sendAndCallAck(_srcChainId, _srcAddress, _nonce, _payload);
    } else {
      revert("OFTCore: unknown packet type");
    }
  }

  function _send(
    address _from,
    uint16 _dstChainId,
    bytes32 _toAddress,
    uint _amount,
    address payable _refundAddress,
    address _zroPaymentAddress,
    bytes memory _adapterParams
  ) internal virtual returns (uint amount) {
    _checkGasLimit(_dstChainId, PT_SEND, _adapterParams, NO_EXTRA_GAS);

    (amount, ) = _removeDust(_amount);
    amount = _debitFrom(_from, _dstChainId, _toAddress, amount); // amount returned should not have dust
    require(amount > 0, "OFTCore: amount too small");

    bytes memory lzPayload = _encodeSendPayload(_toAddress, _ld2sd(amount));
    _lzSend(
      _dstChainId,
      lzPayload,
      _refundAddress,
      _zroPaymentAddress,
      _adapterParams,
      msg.value
    );

    emit SendToChain(_dstChainId, _from, _toAddress, amount);
  }

  function _sendAck(
    uint16 _srcChainId,
    bytes memory,
    uint64,
    bytes memory _payload
  ) internal virtual {
    (address to, uint64 amountSD) = _decodeSendPayload(_payload);
    if (to == address(0)) {
      to = address(0xdead);
    }

    uint amount = _sd2ld(amountSD);
    amount = _creditTo(_srcChainId, to, amount);

    emit ReceiveFromChain(_srcChainId, to, amount);
  }

  function _sendAndCall(
    address _from,
    uint16 _dstChainId,
    bytes32 _toAddress,
    uint _amount,
    bytes memory _payload,
    uint64 _dstGasForCall,
    address payable _refundAddress,
    address _zroPaymentAddress,
    bytes memory _adapterParams
  ) internal virtual returns (uint amount) {
    _checkGasLimit(
      _dstChainId,
      PT_SEND_AND_CALL,
      _adapterParams,
      _dstGasForCall
    );

    (amount, ) = _removeDust(_amount);
    amount = _debitFrom(_from, _dstChainId, _toAddress, amount);
    require(amount > 0, "OFTCore: amount too small");

    // encode the msg.sender into the payload instead of _from
    bytes memory lzPayload = _encodeSendAndCallPayload(
      msg.sender,
      _toAddress,
      _ld2sd(amount),
      _payload,
      _dstGasForCall
    );
    _lzSend(
      _dstChainId,
      lzPayload,
      _refundAddress,
      _zroPaymentAddress,
      _adapterParams,
      msg.value
    );

    emit SendToChain(_dstChainId, _from, _toAddress, amount);
  }

  function _sendAndCallAck(
    uint16 _srcChainId,
    bytes memory _srcAddress,
    uint64 _nonce,
    bytes memory _payload
  ) internal virtual {
    (
      bytes32 from,
      address to,
      uint64 amountSD,
      bytes memory payloadForCall,
      uint64 gasForCall
    ) = _decodeSendAndCallPayload(_payload);

    bool credited = creditedPackets[_srcChainId][_srcAddress][_nonce];
    uint amount = _sd2ld(amountSD);

    // credit to this contract first, and then transfer to receiver only if callOnOFTReceived() succeeds
    if (!credited) {
      amount = _creditTo(_srcChainId, address(this), amount);
      creditedPackets[_srcChainId][_srcAddress][_nonce] = true;
    }

    if (!_isContract(to)) {
      emit NonContractAddress(to);
      return;
    }

    // workaround for stack too deep
    uint16 srcChainId = _srcChainId;
    bytes memory srcAddress = _srcAddress;
    uint64 nonce = _nonce;
    bytes memory payload = _payload;
    bytes32 from_ = from;
    address to_ = to;
    uint amount_ = amount;
    bytes memory payloadForCall_ = payloadForCall;

    // no gas limit for the call if retry
    uint gas = credited ? gasleft() : gasForCall;
    (bool success, bytes memory reason) = address(this).excessivelySafeCall(
      gasleft(),
      150,
      abi.encodeWithSelector(
        this.callOnOFTReceived.selector,
        srcChainId,
        srcAddress,
        nonce,
        from_,
        to_,
        amount_,
        payloadForCall_,
        gas
      )
    );

    if (success) {
      bytes32 hash = keccak256(payload);
      emit CallOFTReceivedSuccess(srcChainId, srcAddress, nonce, hash);
    } else {
      // store the failed message into the nonblockingLzApp
      _storeFailedMessage(srcChainId, srcAddress, nonce, payload, reason);
    }
  }

  function _isContract(address _account) internal view returns (bool) {
    return _account.code.length > 0;
  }

  function _ld2sd(uint _amount) internal view virtual returns (uint64) {
    uint amountSD = _amount / _ld2sdRate();
    require(amountSD <= type(uint64).max, "OFTCore: amountSD overflow");
    return uint64(amountSD);
  }

  function _sd2ld(uint64 _amountSD) internal view virtual returns (uint) {
    return _amountSD * _ld2sdRate();
  }

  function _removeDust(
    uint _amount
  ) internal view virtual returns (uint amountAfter, uint dust) {
    dust = _amount % _ld2sdRate();
    amountAfter = _amount - dust;
  }

  function _encodeSendPayload(
    bytes32 _toAddress,
    uint64 _amountSD
  ) internal view virtual returns (bytes memory) {
    return abi.encodePacked(PT_SEND, _toAddress, _amountSD);
  }

  function _decodeSendPayload(
    bytes memory _payload
  ) internal view virtual returns (address to, uint64 amountSD) {
    require(
      _payload.toUint8(0) == PT_SEND && _payload.length == 41,
      "OFTCore: invalid payload"
    );

    to = _payload.toAddress(13); // drop the first 12 bytes of bytes32
    amountSD = _payload.toUint64(33);
  }

  function _encodeSendAndCallPayload(
    address _from,
    bytes32 _toAddress,
    uint64 _amountSD,
    bytes memory _payload,
    uint64 _dstGasForCall
  ) internal view virtual returns (bytes memory) {
    return
      abi.encodePacked(
        PT_SEND_AND_CALL,
        _toAddress,
        _amountSD,
        _addressToBytes32(_from),
        _dstGasForCall,
        _payload
      );
  }

  function _decodeSendAndCallPayload(
    bytes memory _payload
  )
    internal
    view
    virtual
    returns (
      bytes32 from,
      address to,
      uint64 amountSD,
      bytes memory payload,
      uint64 dstGasForCall
    )
  {
    require(
      _payload.toUint8(0) == PT_SEND_AND_CALL,
      "OFTCore: invalid payload"
    );

    to = _payload.toAddress(13); // drop the first 12 bytes of bytes32
    amountSD = _payload.toUint64(33);
    from = _payload.toBytes32(41);
    dstGasForCall = _payload.toUint64(73);
    payload = _payload.slice(81, _payload.length - 81);
  }

  function _addressToBytes32(
    address _address
  ) internal pure virtual returns (bytes32) {
    return bytes32(uint(uint160(_address)));
  }

  function _debitFrom(
    address _from,
    uint16 _dstChainId,
    bytes32 _toAddress,
    uint _amount
  ) internal virtual returns (uint);

  function _creditTo(
    uint16 _srcChainId,
    address _toAddress,
    uint _amount
  ) internal virtual returns (uint);

  function _transferFrom(
    address _from,
    address _to,
    uint _amount
  ) internal virtual returns (uint);

  function _ld2sdRate() internal view virtual returns (uint);
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import "./BaseOFTV2.sol";

contract OFTV2 is BaseOFTV2, ERC20 {
  uint internal immutable ld2sdRate;

  constructor(
    string memory _name,
    string memory _symbol,
    uint8 _sharedDecimals,
    address _lzEndpoint
  ) ERC20(_name, _symbol) BaseOFTV2(_sharedDecimals, _lzEndpoint) {
    uint8 decimals = decimals();
    require(
      _sharedDecimals <= decimals,
      "OFT: sharedDecimals must be <= decimals"
    );
    ld2sdRate = 10 ** (decimals - _sharedDecimals);
  }

  /************************************************************************
   * public functions
   ************************************************************************/
  function circulatingSupply() public view virtual override returns (uint) {
    return totalSupply();
  }

  function token() public view virtual override returns (address) {
    return address(this);
  }

  /************************************************************************
   * internal functions
   ************************************************************************/
  function _debitFrom(
    address _from,
    uint16,
    bytes32,
    uint _amount
  ) internal virtual override returns (uint) {
    address spender = _msgSender();
    if (_from != spender) _spendAllowance(_from, spender, _amount);
    _burn(_from, _amount);
    return _amount;
  }

  function _creditTo(
    uint16,
    address _toAddress,
    uint _amount
  ) internal virtual override returns (uint) {
    _mint(_toAddress, _amount);
    return _amount;
  }

  function _transferFrom(
    address _from,
    address _to,
    uint _amount
  ) internal virtual override returns (uint) {
    address spender = _msgSender();
    // if transfer from this contract, no need to check allowance
    if (_from != address(this) && _from != spender)
      _spendAllowance(_from, spender, _amount);
    _transfer(_from, _to, _amount);
    return _amount;
  }

  function _ld2sdRate() internal view virtual override returns (uint) {
    return ld2sdRate;
  }
}

{
  "optimizer": {
    "enabled": true,
    "runs": 999999
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "metadata": {
    "useLiteralContent": true
  },
  "libraries": {}
}

• No Contract Security Audit Submitted- Submit Audit Here

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:"uint16","name":"_chainId","type":"uint16"},{"internalType":"address","name":"","type":"address"},{"internalType":"uint256","name":"_configType","type":"uint256"}],"name":"getConfig","outputs":[{"internalType":"bytes","name":"","type":"bytes"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint16","name":"_remoteChainId","type":"uint16"}],"name":"getTrustedRemoteAddress","outputs":[{"internalType":"bytes","name":"","type":"bytes"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"addedValue","type":"uint256"}],"name":"increaseAllowance","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint16","name":"_srcChainId","type":"uint16"},{"internalType":"bytes","name":"_srcAddress","type":"bytes"}],"name":"isTrustedRemote","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"lzEndpoint","outputs":[{"internalType":"contract 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0000000000000000000000003c2269811836af69497e5f486a85d7316753cf620000000000000000000000000000000000000000000000000000000000000006

-----Decoded View---------------
Arg [0] : _layerZeroEndpoint (address): 0x3c2269811836af69497E5F486A85D7316753cf62
Arg [1] : _sharedDecimals (uint8): 6

-----Encoded View---------------
2 Constructor Arguments found :
Arg [0] : 0000000000000000000000003c2269811836af69497e5f486a85d7316753cf62
Arg [1] : 0000000000000000000000000000000000000000000000000000000000000006