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// SPDX-License-Identifier: MIT

pragma solidity ^0.8.12;

import "./utils/OFTCore.sol";
import "../../interfaces/IAgTokenSideChainMultiBridge.sol";
import "@openzeppelin/contracts-upgradeable/security/PausableUpgradeable.sol";
import "@openzeppelin/contracts-upgradeable/token/ERC20/ERC20Upgradeable.sol";

/// @title LayerZeroBridgeToken
/// @author Angle Labs, Inc., forked from https://github.com/LayerZero-Labs/solidity-examples/blob/main/contracts/token/oft/OFT.sol
/// @notice Contract to be deployed on a L2/sidechain for bridging an AgToken using a bridge intermediate token and LayerZero
contract LayerZeroBridgeToken is OFTCore, ERC20Upgradeable, PausableUpgradeable {
    /// @notice Address of the bridgeable token
    /// @dev Immutable
    IAgTokenSideChainMultiBridge public canonicalToken;

    // =============================== Errors ================================

    error InvalidAllowance();

    // ============================= Constructor ===================================

    /// @notice Initializes the contract
    /// @param _name Name of the token corresponding to this contract
    /// @param _symbol Symbol of the token corresponding to this contract
    /// @param _lzEndpoint Layer zero endpoint to pass messages
    /// @param _treasury Address of the treasury contract used for access control
    /// @param initialSupply Initial supply to mint to the canonical token address
    /// @dev The initial supply corresponds to the initial amount that could be bridged using this OFT
    function initialize(
        string memory _name,
        string memory _symbol,
        address _lzEndpoint,
        address _treasury,
        uint256 initialSupply
    ) external initializer {
        __ERC20_init_unchained(_name, _symbol);
        __LzAppUpgradeable_init(_lzEndpoint, _treasury);

        canonicalToken = IAgTokenSideChainMultiBridge(address(ITreasury(_treasury).stablecoin()));
        _approve(address(this), address(canonicalToken), type(uint256).max);
        _mint(address(canonicalToken), initialSupply);
    }

    /// @custom:oz-upgrades-unsafe-allow constructor
    constructor() initializer {}

    // ==================== External Permissionless Functions ======================

    /// @inheritdoc OFTCore
    function sendWithPermit(
        uint16 _dstChainId,
        bytes memory _toAddress,
        uint256 _amount,
        address payable _refundAddress,
        address _zroPaymentAddress,
        bytes memory _adapterParams,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) public payable override {
        canonicalToken.permit(msg.sender, address(this), _amount, deadline, v, r, s);
        send(_dstChainId, _toAddress, _amount, _refundAddress, _zroPaymentAddress, _adapterParams);
    }

    /// @inheritdoc OFTCore
    function withdraw(uint256 amount, address recipient) external override returns (uint256 amountMinted) {
        // Does not check allowances as transfers from `msg.sender`
        _transfer(msg.sender, address(this), amount);
        amountMinted = canonicalToken.swapIn(address(this), amount, recipient);
        uint256 leftover = balanceOf(address(this));
        if (leftover != 0) {
            _transfer(address(this), msg.sender, leftover);
        }
    }

    // ============================= Internal Functions ===================================

    /// @inheritdoc OFTCore
    function _debitFrom(
        uint16,
        bytes memory,
        uint256 _amount
    ) internal override whenNotPaused returns (uint256 amountSwapped) {
        // No need to use safeTransferFrom as we know this implementation reverts on failure
        canonicalToken.transferFrom(msg.sender, address(this), _amount);

        // Swap canonical for this bridge token. There may be some fees
        amountSwapped = canonicalToken.swapOut(address(this), _amount, address(this));
        _burn(address(this), amountSwapped);
    }

    /// @inheritdoc OFTCore
    function _debitCreditFrom(
        uint16,
        bytes memory,
        uint256 _amount
    ) internal override whenNotPaused returns (uint256) {
        _burn(msg.sender, _amount);
        return _amount;
    }

    /// @inheritdoc OFTCore
    function _creditTo(
        uint16,
        address _toAddress,
        uint256 _amount
    ) internal override whenNotPaused returns (uint256 amountMinted) {
        _mint(address(this), _amount);
        amountMinted = canonicalToken.swapIn(address(this), _amount, _toAddress);
        uint256 leftover = balanceOf(address(this));
        if (leftover != 0) {
            _transfer(address(this), _toAddress, leftover);
        }
    }

    // ======================= View Functions ================================

    /// @inheritdoc ERC165Upgradeable
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        return
            interfaceId == type(IOFT).interfaceId ||
            interfaceId == type(IERC20).interfaceId ||
            super.supportsInterface(interfaceId);
    }

    // ======================= Governance Functions ================================

    /// @notice Mints the intermediate contract to the `canonicalToken`
    /// @dev Used to increase the bridging capacity
    function mint(uint256 amount) external onlyGovernorOrGuardian {
        _mint(address(canonicalToken), amount);
    }

    /// @notice Burns the intermediate contract from the `canonicalToken`
    /// @dev Used to decrease the bridging capacity
    function burn(uint256 amount) external onlyGovernorOrGuardian {
        _burn(address(canonicalToken), amount);
    }

    /// @notice Increases allowance of the `canonicalToken`
    function setupAllowance() public onlyGovernorOrGuardian {
        _approve(address(this), address(canonicalToken), type(uint256).max);
    }

    /// @notice Pauses bridging through the contract
    /// @param pause Future pause status
    function pauseSendTokens(bool pause) external onlyGovernorOrGuardian {
        pause ? _pause() : _unpause();
    }

    uint256[49] private __gap;
}

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

pragma solidity ^0.8.2;

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

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

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

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

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

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

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

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

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

pragma solidity ^0.8.0;

import "../utils/ContextUpgradeable.sol";
import "../proxy/utils/Initializable.sol";

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

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

    bool private _paused;

    /**
     * @dev Initializes the contract in unpaused state.
     */
    function __Pausable_init() internal onlyInitializing {
        __Pausable_init_unchained();
    }

    function __Pausable_init_unchained() internal onlyInitializing {
        _paused = false;
    }

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

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

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

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

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

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

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

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (token/ERC20/ERC20.sol)

pragma solidity ^0.8.0;

import "./IERC20Upgradeable.sol";
import "./extensions/IERC20MetadataUpgradeable.sol";
import "../../utils/ContextUpgradeable.sol";
import "../../proxy/utils/Initializable.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.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How
 * to implement supply mechanisms].
 *
 * 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 ERC20Upgradeable is Initializable, ContextUpgradeable, IERC20Upgradeable, IERC20MetadataUpgradeable {
    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}.
     *
     * The default value of {decimals} is 18. To select a different value for
     * {decimals} you should overload it.
     *
     * All two of these values are immutable: they can only be set once during
     * construction.
     */
    function __ERC20_init(string memory name_, string memory symbol_) internal onlyInitializing {
        __ERC20_init_unchained(name_, symbol_);
    }

    function __ERC20_init_unchained(string memory name_, string memory symbol_) internal onlyInitializing {
        _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 value {ERC20} uses, unless this function is
     * 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;
        }
        _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;
        _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;
        }
        _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 {}

    /**
     * @dev This empty reserved space is put in place to allow future versions to add new
     * variables without shifting down storage in the inheritance chain.
     * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
     */
    uint256[45] private __gap;
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20Upgradeable {
    /**
     * @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 (token/ERC20/extensions/IERC20Metadata.sol)

pragma solidity ^0.8.0;

import "../IERC20Upgradeable.sol";

/**
 * @dev Interface for the optional metadata functions from the ERC20 standard.
 *
 * _Available since v4.1._
 */
interface IERC20MetadataUpgradeable is IERC20Upgradeable {
    /**
     * @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 v4.4.1 (token/ERC20/extensions/draft-IERC20Permit.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in
 * https://eips.ethereum.org/EIPS/eip-2612[EIP-2612].
 *
 * Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by
 * presenting a message signed by the account. By not relying on {IERC20-approve}, the token holder account doesn't
 * need to send a transaction, and thus is not required to hold Ether at all.
 */
interface IERC20PermitUpgradeable {
    /**
     * @dev Sets `value` as the allowance of `spender` over ``owner``'s tokens,
     * given ``owner``'s signed approval.
     *
     * IMPORTANT: The same issues {IERC20-approve} has related to transaction
     * ordering also apply here.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `deadline` must be a timestamp in the future.
     * - `v`, `r` and `s` must be a valid `secp256k1` signature from `owner`
     * over the EIP712-formatted function arguments.
     * - the signature must use ``owner``'s current nonce (see {nonces}).
     *
     * For more information on the signature format, see the
     * https://eips.ethereum.org/EIPS/eip-2612#specification[relevant EIP
     * section].
     */
    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;

    /**
     * @dev Returns the current nonce for `owner`. This value must be
     * included whenever a signature is generated for {permit}.
     *
     * Every successful call to {permit} increases ``owner``'s nonce by one. This
     * prevents a signature from being used multiple times.
     */
    function nonces(address owner) external view returns (uint256);

    /**
     * @dev Returns the domain separator used in the encoding of the signature for {permit}, as defined by {EIP712}.
     */
    // solhint-disable-next-line func-name-mixedcase
    function DOMAIN_SEPARATOR() external view returns (bytes32);
}

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

pragma solidity ^0.8.1;

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

        return account.code.length > 0;
    }

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

pragma solidity ^0.8.0;

import "./IERC165Upgradeable.sol";
import "../../proxy/utils/Initializable.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 ERC165Upgradeable is Initializable, IERC165Upgradeable {
    function __ERC165_init() internal onlyInitializing {
    }

    function __ERC165_init_unchained() internal onlyInitializing {
    }
    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        return interfaceId == type(IERC165Upgradeable).interfaceId;
    }

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts 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 IERC165Upgradeable {
    /**
     * @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 v4.6.0) (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/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

pragma solidity ^0.8.12;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/utils/introspection/IERC165.sol";

/**
 * @dev Interface of the IOFT core standard
 * @dev Forked from https://github.com/LayerZero-Labs/solidity-examples/blob/main/contracts/token/oft/IOFTCore.sol
 */
interface IOFTCore is IERC165 {
    /// @notice Estimates send token `_tokenId` to (`_dstChainId`, `_toAddress`)
    /// @param _dstChainId L0 defined chain id to send tokens too
    /// @param _toAddress dynamic bytes array which contains the address to whom you are sending tokens to on the dstChain
    /// @param _amount amount of the tokens to transfer
    /// @param _useZro indicates to use zro to pay L0 fees
    /// @param _adapterParams flexible bytes array to indicate messaging adapter services in L0
    function estimateSendFee(
        uint16 _dstChainId,
        bytes calldata _toAddress,
        uint256 _amount,
        bool _useZro,
        bytes calldata _adapterParams
    ) external view returns (uint256 nativeFee, uint256 zroFee);

    /// @notice Sends `_amount` amount of token to (`_dstChainId`, `_toAddress`)
    /// @param _dstChainId the destination chain identifier
    /// @param _toAddress can be any size depending on the `dstChainId`.
    /// @param _amount the quantity of tokens in wei
    /// @param _refundAddress the address LayerZero refunds if too much message fee is sent
    /// @param _zroPaymentAddress set to address(0x0) if not paying in ZRO (LayerZero Token)
    /// @param _adapterParams is a flexible bytes array to indicate messaging adapter services
    function send(
        uint16 _dstChainId,
        bytes calldata _toAddress,
        uint256 _amount,
        address payable _refundAddress,
        address _zroPaymentAddress,
        bytes calldata _adapterParams
    ) external payable;

    /// @notice Sends `_amount` amount of credit to (`_dstChainId`, `_toAddress`)
    /// @param _dstChainId the destination chain identifier
    /// @param _toAddress can be any size depending on the `dstChainId`.
    /// @param _amount the quantity of credit to send in wei
    /// @param _refundAddress the address LayerZero refunds if too much message fee is sent
    /// @param _zroPaymentAddress set to address(0x0) if not paying in ZRO (LayerZero Token)
    /// @param _adapterParams is a flexible bytes array to indicate messaging adapter services
    function sendCredit(
        uint16 _dstChainId,
        bytes calldata _toAddress,
        uint256 _amount,
        address payable _refundAddress,
        address _zroPaymentAddress,
        bytes calldata _adapterParams
    ) external payable;

    /// @notice Sends `_amount` amount of token to (`_dstChainId`, `_toAddress`)
    /// @param _dstChainId The destination chain identifier
    /// @param _toAddress Can be any size depending on the `dstChainId`.
    /// @param _amount Quantity of tokens in wei
    /// @param _refundAddress Address LayerZero refunds if too much message fee is sent
    /// @param _zroPaymentAddress Set to address(0x0) if not paying in ZRO (LayerZero Token)
    /// @param _adapterParams Flexible bytes array to indicate messaging adapter services
    /// @param deadline Deadline parameter for the signature to be valid
    /// @dev The `v`, `r`, and `s` parameters are used as signature data
    function sendWithPermit(
        uint16 _dstChainId,
        bytes memory _toAddress,
        uint256 _amount,
        address payable _refundAddress,
        address _zroPaymentAddress,
        bytes memory _adapterParams,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external payable;

    /// @notice Withdraws amount of canonical token from the `msg.sender` balance and sends it to the recipient
    /// @param amount Amount to withdraw
    /// @param recipient Address to send the canonical token to
    /// @return The amount of canonical token sent
    function withdraw(uint256 amount, address recipient) external returns (uint256);

    /// @dev Emitted when `_amount` tokens are moved from the `_sender` to (`_dstChainId`, `_toAddress`)
    /// `_nonce` is the outbound nonce
    event SendToChain(
        address indexed _sender,
        uint16 indexed _dstChainId,
        bytes indexed _toAddress,
        uint256 _amount,
        uint64 _nonce
    );

    /// @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,
        bytes indexed _srcAddress,
        address indexed _toAddress,
        uint256 _amount,
        uint64 _nonce
    );
}

/// @dev Interface of the OFT standard
interface IOFT is IOFTCore, IERC20 {

}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.12;

import "@openzeppelin/contracts-upgradeable/proxy/utils/Initializable.sol";
import "../../../interfaces/external/layerZero/ILayerZeroReceiver.sol";
import "../../../interfaces/external/layerZero/ILayerZeroUserApplicationConfig.sol";
import "../../../interfaces/external/layerZero/ILayerZeroEndpoint.sol";
import "../../../interfaces/ITreasury.sol";

/// @title NonblockingLzApp
/// @author Angle Labs, Inc., forked from https://github.com/LayerZero-Labs/solidity-examples/
/// @notice Base contract for bridging using LayerZero
abstract contract NonblockingLzApp is Initializable, ILayerZeroReceiver, ILayerZeroUserApplicationConfig {
    /// @notice Layer Zero endpoint
    ILayerZeroEndpoint public lzEndpoint;

    /// @notice Maps chainIds to failed messages to retry them
    mapping(uint16 => mapping(bytes => mapping(uint64 => bytes32))) public failedMessages;

    /// @notice Maps chainIds to their OFT address
    mapping(uint16 => bytes) public trustedRemoteLookup;

    /// @notice Reference to the treasury contract to fetch access control
    address public treasury;

    // ================================== Events ===================================

    event SetTrustedRemote(uint16 _srcChainId, bytes _srcAddress);
    event MessageFailed(uint16 _srcChainId, bytes _srcAddress, uint64 _nonce, bytes _payload);

    // =============================== Errors ================================

    error NotGovernor();
    error NotGovernorOrGuardian();
    error InvalidEndpoint();
    error InvalidSource();
    error InvalidCaller();
    error InvalidPayload();
    error ZeroAddress();

    // ============================= Constructor ===================================

    //solhint-disable-next-line
    function __LzAppUpgradeable_init(address _endpoint, address _treasury) internal {
        if (_endpoint == address(0) || _treasury == address(0)) revert ZeroAddress();
        lzEndpoint = ILayerZeroEndpoint(_endpoint);
        treasury = _treasury;
    }

    // =============================== Modifiers ===================================

    /// @notice Checks whether the `msg.sender` has the governor role or the guardian role
    modifier onlyGovernorOrGuardian() {
        if (!ITreasury(treasury).isGovernorOrGuardian(msg.sender)) revert NotGovernorOrGuardian();
        _;
    }

    // ==================== External Permissionless Functions ======================

    /// @notice Receives a message from the LZ endpoint and process it
    /// @param _srcChainId ChainId of the source chain - LayerZero standard
    /// @param _srcAddress Sender of the source chain
    /// @param _nonce Nounce of the message
    /// @param _payload Data: recipient address and amount
    function lzReceive(
        uint16 _srcChainId,
        bytes memory _srcAddress,
        uint64 _nonce,
        bytes memory _payload
    ) public virtual override {
        // lzReceive must be called by the endpoint for security
        if (msg.sender != address(lzEndpoint)) revert InvalidEndpoint();

        bytes memory trustedRemote = trustedRemoteLookup[_srcChainId];
        // if will still block the message pathway from (srcChainId, srcAddress). should not receive message from untrusted remote.
        if (_srcAddress.length != trustedRemote.length || keccak256(_srcAddress) != keccak256(trustedRemote))
            revert InvalidSource();

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

    /// @notice Retries a message that previously failed and was stored
    /// @param _srcChainId ChainId of the source chain - LayerZero standard
    /// @param _srcAddress Sender of the source chain
    /// @param _nonce Nounce of the message
    /// @param _payload Data: recipient address and amount
    function retryMessage(
        uint16 _srcChainId,
        bytes memory _srcAddress,
        uint64 _nonce,
        bytes memory _payload
    ) public payable virtual {
        // assert there is message to retry
        bytes32 payloadHash = failedMessages[_srcChainId][_srcAddress][_nonce];
        if (payloadHash == bytes32(0) || keccak256(_payload) != payloadHash) revert InvalidPayload();
        // clear the stored message
        failedMessages[_srcChainId][_srcAddress][_nonce] = bytes32(0);
        // execute the message. revert if it fails again
        _nonblockingLzReceive(_srcChainId, _srcAddress, _nonce, _payload);
    }

    // ============================= Internal Functions ===================================

    /// @notice Handles message receptions in a non blocking way
    /// @param _srcChainId ChainId of the source chain - LayerZero standard
    /// @param _srcAddress Sender of the source chain
    /// @param _nonce Nounce of the message
    /// @param _payload Data: recipient address and amount
    /// @dev public for the needs of try / catch but effectively internal
    function nonblockingLzReceive(
        uint16 _srcChainId,
        bytes memory _srcAddress,
        uint64 _nonce,
        bytes memory _payload
    ) public virtual {
        // only internal transaction
        if (msg.sender != address(this)) revert InvalidCaller();
        _nonblockingLzReceive(_srcChainId, _srcAddress, _nonce, _payload);
    }

    /// @notice Handles message receptions in a non blocking way
    /// @param _srcChainId ChainId of the source chain - LayerZero standard
    /// @param _srcAddress Sender of the source chain
    /// @param _nonce Nounce of the message
    /// @param _payload Data: recipient address and amount
    function _nonblockingLzReceive(
        uint16 _srcChainId,
        bytes memory _srcAddress,
        uint64 _nonce,
        bytes memory _payload
    ) internal virtual;

    /// @notice Handles message receptions in a blocking way
    /// @param _srcChainId ChainId of the source chain - LayerZero standard
    /// @param _srcAddress Sender of the source chain
    /// @param _nonce Nounce of the message
    /// @param _payload Data: recipient address and amount
    function _blockingLzReceive(
        uint16 _srcChainId,
        bytes memory _srcAddress,
        uint64 _nonce,
        bytes memory _payload
    ) internal {
        // try-catch all errors/exceptions
        try this.nonblockingLzReceive(_srcChainId, _srcAddress, _nonce, _payload) {
            // do nothing
        } catch {
            // error / exception
            failedMessages[_srcChainId][_srcAddress][_nonce] = keccak256(_payload);
            emit MessageFailed(_srcChainId, _srcAddress, _nonce, _payload);
        }
    }

    /// @notice Sends a message to the LZ endpoint and process it
    /// @param _dstChainId L0 defined chain id to send tokens too
    /// @param _payload Data: recipient address and amount
    /// @param _refundAddress Address LayerZero refunds if too much message fee is sent
    /// @param _zroPaymentAddress Set to address(0x0) if not paying in ZRO (LayerZero Token)
    /// @param _adapterParams Flexible bytes array to indicate messaging adapter services in L0
    function _lzSend(
        uint16 _dstChainId,
        bytes memory _payload,
        address payable _refundAddress,
        address _zroPaymentAddress,
        bytes memory _adapterParams
    ) internal virtual {
        bytes memory trustedRemote = trustedRemoteLookup[_dstChainId];
        if (trustedRemote.length == 0) revert InvalidSource();
        //solhint-disable-next-line
        lzEndpoint.send{ value: msg.value }(
            _dstChainId,
            trustedRemote,
            _payload,
            _refundAddress,
            _zroPaymentAddress,
            _adapterParams
        );
    }

    // ======================= Governance Functions ================================

    /// @notice Sets the corresponding address on an other chain.
    /// @param _srcChainId ChainId of the source chain - LayerZero standard
    /// @param _srcAddress Address on the source chain
    /// @dev Used for both receiving and sending message
    /// @dev There can only be one trusted source per chain
    /// @dev Allows owner to set it multiple times.
    function setTrustedRemote(uint16 _srcChainId, bytes calldata _srcAddress) external onlyGovernorOrGuardian {
        trustedRemoteLookup[_srcChainId] = _srcAddress;
        emit SetTrustedRemote(_srcChainId, _srcAddress);
    }

    /// @notice Fetches the default LZ config
    function getConfig(
        uint16 _version,
        uint16 _chainId,
        address,
        uint256 _configType
    ) external view returns (bytes memory) {
        return lzEndpoint.getConfig(_version, _chainId, address(this), _configType);
    }

    /// @notice Overrides the default LZ config
    function setConfig(
        uint16 _version,
        uint16 _chainId,
        uint256 _configType,
        bytes calldata _config
    ) external override onlyGovernorOrGuardian {
        lzEndpoint.setConfig(_version, _chainId, _configType, _config);
    }

    /// @notice Overrides the default LZ config
    function setSendVersion(uint16 _version) external override onlyGovernorOrGuardian {
        lzEndpoint.setSendVersion(_version);
    }

    /// @notice Overrides the default LZ config
    function setReceiveVersion(uint16 _version) external override onlyGovernorOrGuardian {
        lzEndpoint.setReceiveVersion(_version);
    }

    /// @notice Unpauses the receive functionalities
    function forceResumeReceive(uint16 _srcChainId, bytes calldata _srcAddress)
        external
        override
        onlyGovernorOrGuardian
    {
        lzEndpoint.forceResumeReceive(_srcChainId, _srcAddress);
    }

    // ======================= View Functions ================================

    /// @notice Checks if the `_srcAddress` corresponds to the trusted source
    function isTrustedRemote(uint16 _srcChainId, bytes calldata _srcAddress) external view returns (bool) {
        bytes memory trustedSource = trustedRemoteLookup[_srcChainId];
        return keccak256(trustedSource) == keccak256(_srcAddress);
    }

    uint256[46] private __gap;
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.12;

import "./NonblockingLzApp.sol";
import "./IOFTCore.sol";
import "@openzeppelin/contracts-upgradeable/utils/introspection/ERC165Upgradeable.sol";

/// @title OFTCore
/// @author Forked from https://github.com/LayerZero-Labs/solidity-examples/blob/main/contracts/token/oft/OFTCore.sol
/// but with slight modifications from the Angle Labs, Inc. which added return values to the `_creditTo` and `_debitFrom` functions
/// @notice Base contract for bridging using LayerZero
abstract contract OFTCore is NonblockingLzApp, ERC165Upgradeable, IOFTCore {
    // ==================== External Permissionless Functions ======================

    /// @inheritdoc IOFTCore
    function sendWithPermit(
        uint16 _dstChainId,
        bytes memory _toAddress,
        uint256 _amount,
        address payable _refundAddress,
        address _zroPaymentAddress,
        bytes memory _adapterParams,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) public payable virtual;

    /// @inheritdoc IOFTCore
    function send(
        uint16 _dstChainId,
        bytes memory _toAddress,
        uint256 _amount,
        address payable _refundAddress,
        address _zroPaymentAddress,
        bytes memory _adapterParams
    ) public payable virtual {
        _amount = _debitFrom(_dstChainId, _toAddress, _amount);

        bytes memory payload = abi.encode(_toAddress, _amount);
        _lzSend(_dstChainId, payload, _refundAddress, _zroPaymentAddress, _adapterParams);

        uint64 nonce = lzEndpoint.getOutboundNonce(_dstChainId, address(this));
        emit SendToChain(msg.sender, _dstChainId, _toAddress, _amount, nonce);
    }

    /// @inheritdoc IOFTCore
    function sendCredit(
        uint16 _dstChainId,
        bytes memory _toAddress,
        uint256 _amount,
        address payable _refundAddress,
        address _zroPaymentAddress,
        bytes memory _adapterParams
    ) public payable virtual {
        _amount = _debitCreditFrom(_dstChainId, _toAddress, _amount);

        _send(_dstChainId, _toAddress, _amount, _refundAddress, _zroPaymentAddress, _adapterParams);
    }

    /// @inheritdoc IOFTCore
    function withdraw(uint256 amount, address recipient) external virtual returns (uint256);

    // =========================== Internal Functions ==============================

    /// @notice Internal function to send `_amount` amount of token to (`_dstChainId`, `_toAddress`)
    /// @param _dstChainId the destination chain identifier
    /// @param _toAddress can be any size depending on the `dstChainId`.
    /// @param _amount the quantity of tokens in wei
    /// @param _refundAddress the address LayerZero refunds if too much message fee is sent
    /// @param _zroPaymentAddress set to address(0x0) if not paying in ZRO (LayerZero Token)
    /// @param _adapterParams is a flexible bytes array to indicate messaging adapter services
    /// @dev Accounting and checks should be performed beforehand
    function _send(
        uint16 _dstChainId,
        bytes memory _toAddress,
        uint256 _amount,
        address payable _refundAddress,
        address _zroPaymentAddress,
        bytes memory _adapterParams
    ) internal {
        bytes memory payload = abi.encode(_toAddress, _amount);
        _lzSend(_dstChainId, payload, _refundAddress, _zroPaymentAddress, _adapterParams);

        uint64 nonce = lzEndpoint.getOutboundNonce(_dstChainId, address(this));
        emit SendToChain(msg.sender, _dstChainId, _toAddress, _amount, nonce);
    }

    /// @inheritdoc NonblockingLzApp
    function _nonblockingLzReceive(
        uint16 _srcChainId,
        bytes memory _srcAddress,
        uint64 _nonce,
        bytes memory _payload
    ) internal virtual override {
        // decode and load the toAddress
        (bytes memory toAddressBytes, uint256 amount) = abi.decode(_payload, (bytes, uint256));
        address toAddress;
        //solhint-disable-next-line
        assembly {
            toAddress := mload(add(toAddressBytes, 20))
        }
        amount = _creditTo(_srcChainId, toAddress, amount);

        emit ReceiveFromChain(_srcChainId, _srcAddress, toAddress, amount, _nonce);
    }

    /// @notice Makes accountability when bridging from this contract using canonical token
    /// @param _dstChainId ChainId of the destination chain - LayerZero standard
    /// @param _toAddress Recipient on the destination chain
    /// @param _amount Amount to bridge
    function _debitFrom(
        uint16 _dstChainId,
        bytes memory _toAddress,
        uint256 _amount
    ) internal virtual returns (uint256);

    /// @notice Makes accountability when bridging from this contract's credit
    /// @param _dstChainId ChainId of the destination chain - LayerZero standard
    /// @param _toAddress Recipient on the destination chain
    /// @param _amount Amount to bridge
    function _debitCreditFrom(
        uint16 _dstChainId,
        bytes memory _toAddress,
        uint256 _amount
    ) internal virtual returns (uint256);

    /// @notice Makes accountability when bridging to this contract
    /// @param _srcChainId ChainId of the source chain - LayerZero standard
    /// @param _toAddress Recipient on this chain
    /// @param _amount Amount to bridge
    function _creditTo(
        uint16 _srcChainId,
        address _toAddress,
        uint256 _amount
    ) internal virtual returns (uint256);

    // ========================== View Functions ===================================

    /// @inheritdoc ERC165Upgradeable
    function supportsInterface(bytes4 interfaceId)
        public
        view
        virtual
        override(ERC165Upgradeable, IERC165)
        returns (bool)
    {
        return interfaceId == type(IOFTCore).interfaceId || super.supportsInterface(interfaceId);
    }

    /// @inheritdoc IOFTCore
    function estimateSendFee(
        uint16 _dstChainId,
        bytes memory _toAddress,
        uint256 _amount,
        bool _useZro,
        bytes memory _adapterParams
    ) public view virtual override returns (uint256 nativeFee, uint256 zroFee) {
        // mock the payload for send()
        bytes memory payload = abi.encode(_toAddress, _amount);
        return lzEndpoint.estimateFees(_dstChainId, address(this), payload, _useZro, _adapterParams);
    }

    uint256[50] private __gap;
}

// SPDX-License-Identifier: GPL-3.0

pragma solidity ^0.8.12;

import "@openzeppelin/contracts-upgradeable/token/ERC20/IERC20Upgradeable.sol";

/// @title IAgToken
/// @author Angle Labs, Inc.
/// @notice Interface for the stablecoins `AgToken` contracts
/// @dev This interface only contains functions of the `AgToken` contract which are called by other contracts
/// of this module or of the first module of the Angle Protocol
interface IAgToken is IERC20Upgradeable {
    // ======================= Minter Role Only Functions ===========================

    /// @notice Lets the `StableMaster` contract or another whitelisted contract mint agTokens
    /// @param account Address to mint to
    /// @param amount Amount to mint
    /// @dev The contracts allowed to issue agTokens are the `StableMaster` contract, `VaultManager` contracts
    /// associated to this stablecoin as well as the flash loan module (if activated) and potentially contracts
    /// whitelisted by governance
    function mint(address account, uint256 amount) external;

    /// @notice Burns `amount` tokens from a `burner` address after being asked to by `sender`
    /// @param amount Amount of tokens to burn
    /// @param burner Address to burn from
    /// @param sender Address which requested the burn from `burner`
    /// @dev This method is to be called by a contract with the minter right after being requested
    /// to do so by a `sender` address willing to burn tokens from another `burner` address
    /// @dev The method checks the allowance between the `sender` and the `burner`
    function burnFrom(
        uint256 amount,
        address burner,
        address sender
    ) external;

    /// @notice Burns `amount` tokens from a `burner` address
    /// @param amount Amount of tokens to burn
    /// @param burner Address to burn from
    /// @dev This method is to be called by a contract with a minter right on the AgToken after being
    /// requested to do so by an address willing to burn tokens from its address
    function burnSelf(uint256 amount, address burner) external;

    // ========================= Treasury Only Functions ===========================

    /// @notice Adds a minter in the contract
    /// @param minter Minter address to add
    /// @dev Zero address checks are performed directly in the `Treasury` contract
    function addMinter(address minter) external;

    /// @notice Removes a minter from the contract
    /// @param minter Minter address to remove
    /// @dev This function can also be called by a minter wishing to revoke itself
    function removeMinter(address minter) external;

    /// @notice Sets a new treasury contract
    /// @param _treasury New treasury address
    function setTreasury(address _treasury) external;

    // ========================= External functions ================================

    /// @notice Checks whether an address has the right to mint agTokens
    /// @param minter Address for which the minting right should be checked
    /// @return Whether the address has the right to mint agTokens or not
    function isMinter(address minter) external view returns (bool);

    /// @notice Get the associated treasury
    function treasury() external view returns (address);
}

// SPDX-License-Identifier: GPL-3.0

pragma solidity ^0.8.12;

import "@openzeppelin/contracts-upgradeable/token/ERC20/extensions/draft-IERC20PermitUpgradeable.sol";
import "@openzeppelin/contracts-upgradeable/token/ERC20/IERC20Upgradeable.sol";

/// @title IAgTokenSideChainMultiBridge
/// @author Angle Labs, Inc.
/// @notice Interface for the canonical `AgToken` contracts
/// @dev This interface only contains functions useful for bridge tokens to interact with the canonical token
interface IAgTokenSideChainMultiBridge is IERC20PermitUpgradeable, IERC20Upgradeable {
    /// @notice Mints the canonical token from a supported bridge token
    /// @param bridgeToken Bridge token to use to mint
    /// @param amount Amount of bridge tokens to send
    /// @param to Address to which the stablecoin should be sent
    /// @return Amount of the canonical stablecoin actually minted
    /// @dev Some fees may be taken by the protocol depending on the token used and on the address calling
    function swapIn(
        address bridgeToken,
        uint256 amount,
        address to
    ) external returns (uint256);

    /// @notice Burns the canonical token in exchange for a bridge token
    /// @param bridgeToken Bridge token required
    /// @param amount Amount of canonical tokens to burn
    /// @param to Address to which the bridge token should be sent
    /// @return Amount of bridge tokens actually sent back
    /// @dev Some fees may be taken by the protocol depending on the token used and on the address calling
    function swapOut(
        address bridgeToken,
        uint256 amount,
        address to
    ) external returns (uint256);
}

// SPDX-License-Identifier: GPL-3.0

pragma solidity ^0.8.12;

/// @title ICoreBorrow
/// @author Angle Labs, Inc.
/// @notice Interface for the `CoreBorrow` contract
/// @dev This interface only contains functions of the `CoreBorrow` contract which are called by other contracts
/// of this module
interface ICoreBorrow {
    /// @notice Checks if an address corresponds to a treasury of a stablecoin with a flash loan
    /// module initialized on it
    /// @param treasury Address to check
    /// @return Whether the address has the `FLASHLOANER_TREASURY_ROLE` or not
    function isFlashLoanerTreasury(address treasury) external view returns (bool);

    /// @notice Checks whether an address is governor of the Angle Protocol or not
    /// @param admin Address to check
    /// @return Whether the address has the `GOVERNOR_ROLE` or not
    function isGovernor(address admin) external view returns (bool);

    /// @notice Checks whether an address is governor or a guardian of the Angle Protocol or not
    /// @param admin Address to check
    /// @return Whether the address has the `GUARDIAN_ROLE` or not
    /// @dev Governance should make sure when adding a governor to also give this governor the guardian
    /// role by calling the `addGovernor` function
    function isGovernorOrGuardian(address admin) external view returns (bool);
}

// SPDX-License-Identifier: GPL-3.0

pragma solidity ^0.8.12;

import "./IAgToken.sol";
import "./ICoreBorrow.sol";

/// @title IFlashAngle
/// @author Angle Labs, Inc.
/// @notice Interface for the `FlashAngle` contract
/// @dev This interface only contains functions of the contract which are called by other contracts
/// of this module
interface IFlashAngle {
    /// @notice Reference to the `CoreBorrow` contract managing the FlashLoan module
    function core() external view returns (ICoreBorrow);

    /// @notice Sends the fees taken from flash loans to the treasury contract associated to the stablecoin
    /// @param stablecoin Stablecoin from which profits should be sent
    /// @return balance Amount of profits sent
    /// @dev This function can only be called by the treasury contract
    function accrueInterestToTreasury(IAgToken stablecoin) external returns (uint256 balance);

    /// @notice Adds support for a stablecoin
    /// @param _treasury Treasury associated to the stablecoin to add support for
    /// @dev This function can only be called by the `CoreBorrow` contract
    function addStablecoinSupport(address _treasury) external;

    /// @notice Removes support for a stablecoin
    /// @param _treasury Treasury associated to the stablecoin to remove support for
    /// @dev This function can only be called by the `CoreBorrow` contract
    function removeStablecoinSupport(address _treasury) external;

    /// @notice Sets a new core contract
    /// @param _core Core contract address to set
    /// @dev This function can only be called by the `CoreBorrow` contract
    function setCore(address _core) external;
}

// SPDX-License-Identifier: GPL-3.0

pragma solidity ^0.8.12;

import "./IAgToken.sol";
import "./ICoreBorrow.sol";
import "./IFlashAngle.sol";

/// @title ITreasury
/// @author Angle Labs, Inc.
/// @notice Interface for the `Treasury` contract
/// @dev This interface only contains functions of the `Treasury` which are called by other contracts
/// of this module
interface ITreasury {
    /// @notice Stablecoin handled by this `treasury` contract
    function stablecoin() external view returns (IAgToken);

    /// @notice Checks whether a given address has the  governor role
    /// @param admin Address to check
    /// @return Whether the address has the governor role
    /// @dev Access control is only kept in the `CoreBorrow` contract
    function isGovernor(address admin) external view returns (bool);

    /// @notice Checks whether a given address has the guardian or the governor role
    /// @param admin Address to check
    /// @return Whether the address has the guardian or the governor role
    /// @dev Access control is only kept in the `CoreBorrow` contract which means that this function
    /// queries the `CoreBorrow` contract
    function isGovernorOrGuardian(address admin) external view returns (bool);

    /// @notice Checks whether a given address has well been initialized in this contract
    /// as a `VaultManager`
    /// @param _vaultManager Address to check
    /// @return Whether the address has been initialized or not
    function isVaultManager(address _vaultManager) external view returns (bool);

    /// @notice Sets a new flash loan module for this stablecoin
    /// @param _flashLoanModule Reference to the new flash loan module
    /// @dev This function removes the minting right to the old flash loan module and grants
    /// it to the new module
    function setFlashLoanModule(address _flashLoanModule) external;
}

// 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,
        uint256 _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 (uint256 nativeFee, uint256 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,
        uint256 _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,
        uint256 _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;
}

{
  "evmVersion": "london",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "ipfs",
    "useLiteralContent": true
  },
  "optimizer": {
    "enabled": true,
    "runs": 1000000
  },
  "remappings": [],
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  }
}

• No Contract Security Audit Submitted- Submit Audit Here

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ILayerZeroEndpoint","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint16","name":"_srcChainId","type":"uint16"},{"internalType":"bytes","name":"_srcAddress","type":"bytes"},{"internalType":"uint64","name":"_nonce","type":"uint64"},{"internalType":"bytes","name":"_payload","type":"bytes"}],"name":"lzReceive","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"mint","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"name","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint16","name":"_srcChainId","type":"uint16"},{"internalType":"bytes","name":"_srcAddress","type":"bytes"},{"internalType":"uint64","name":"_nonce","type":"uint64"},{"internalType":"bytes","name":"_payload","type":"bytes"}],"name":"nonblockingLzReceive","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bool","name":"pause","type":"bool"}],"name":"pauseSendTokens","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"paused","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint16","name":"_srcChainId","type":"uint16"},{"internalType":"bytes","name":"_srcAddress","type":"bytes"},{"internalType":"uint64","name":"_nonce","type":"uint64"},{"internalType":"bytes","name":"_payload","type":"bytes"}],"name":"retryMessage","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"uint16","name":"_dstChainId","type":"uint16"},{"internalType":"bytes","name":"_toAddress","type":"bytes"},{"internalType":"uint256","name":"_amount","type":"uint256"},{"internalType":"address payable","name":"_refundAddress","type":"address"},{"internalType":"address","name":"_zroPaymentAddress","type":"address"},{"internalType":"bytes","name":"_adapterParams","type":"bytes"}],"name":"send","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"uint16","name":"_dstChainId","type":"uint16"},{"internalType":"bytes","name":"_toAddress","type":"bytes"},{"internalType":"uint256","name":"_amount","type":"uint256"},{"internalType":"address payable","name":"_refundAddress","type":"address"},{"internalType":"address","name":"_zroPaymentAddress","type":"address"},{"internalType":"bytes","name":"_adapterParams","type":"bytes"}],"name":"sendCredit","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"uint16","name":"_dstChainId","type":"uint16"},{"internalType":"bytes","name":"_toAddress","type":"bytes"},{"internalType":"uint256","name":"_amount","type":"uint256"},{"internalType":"address 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