Contract

0xF35B6C0c268829bdEC7AE5ff93C473f7a8050909

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387722024-12-16 17:41:077 days ago1734370867  Contract Creation0 SOPH
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Contract Source Code Verified (Exact Match)

Contract Name:
LzOftHelper

Compiler Version
v0.8.26+commit.8a97fa7a

ZkSolc Version
v1.5.6

Optimization Enabled:
Yes with 200 runs

Other Settings:
shanghai EvmVersion, None license
File 1 of 11 : LzOftHelper.sol
// SPDX-License-Identifier: GPL-3.0-only

pragma solidity 0.8.26;

import "contracts/proxies/Upgradeable2Step.sol";
import "contracts/s/IOFT.sol";
import "contracts/common/Rescuable.sol";

contract LzOftHelper is Upgradeable2Step, Rescuable {
    using SafeERC20 for IERC20;

    event ToggleOFTContract(address indexed oftContract, bool indexed isEnabled);

    /// @notice Mapping of allowed OFT contracts and their enabled status.
    mapping (IOFT => bool) public allowedOFTs;

    function send(IOFT oftContract, IOFT.SendParam memory _sendParam) external returns (IOFT.MessagingReceipt memory msgReceipt, IOFT.OFTReceipt memory oftReceipt) {
        require(allowedOFTs[oftContract], "unauthorized OFT");

        // override supplied values
        //ref: https://docs.layerzero.network/v2/developers/evm/oft/quickstart#message-execution-options
        _sendParam.extraOptions = hex'0003010011010000000000000000000000000000ea60';
        _sendParam.composeMsg = "";
        _sendParam.oftCmd = "";

        // handles transfers for OFT and OFTAdapter underlying token
        IERC20(oftContract.token()).safeTransferFrom(msg.sender, address(this), _sendParam.amountLD);

        IOFT.MessagingFee memory _fee = oftContract.quoteSend(_sendParam, false);
        require(address(this).balance >= _fee.nativeFee, "not enough fee token");

        return oftContract.send{value: _fee.nativeFee}(_sendParam, _fee, address(this));
    }

    function quoteSend(IOFT oftContract, IOFT.SendParam memory _sendParam) external view returns (IOFT.MessagingFee memory msgFee) {
        // override supplied values
        //ref: https://docs.layerzero.network/v2/developers/evm/oft/quickstart#message-execution-options
        _sendParam.extraOptions = hex'0003010011010000000000000000000000000000ea60';
        _sendParam.composeMsg = "";
        _sendParam.oftCmd = "";

        return oftContract.quoteSend(_sendParam, false);
    }

    function toggleOFTContract(IOFT oftContract_, bool isEnabled_) external onlyOwner {
        allowedOFTs[oftContract_] = isEnabled_;

        if (isEnabled_) {
            // handles OFT approval if necessary
            if (oftContract_.approvalRequired()) {
                IERC20(oftContract_.token()).forceApprove(address(oftContract_), type(uint256).max);
            }
        } else {
            IERC20(oftContract_.token()).forceApprove(address(oftContract_), 0);
        }

        emit ToggleOFTContract(address(oftContract_), isEnabled_);
    }

    function addressToBytes32(address _addr) external pure returns (bytes32) {
        return bytes32(uint256(uint160(_addr)));
    }

    function _requireRescuerRole() internal view override {
        _checkOwner();
    }

    // allowed to receive native token
    receive() external payable {}
}

File 2 of 11 : Upgradeable2Step.sol
// SPDX-License-Identifier: GPL-3.0-only
pragma solidity 0.8.26;

import "contracts/access/Ownable2Step.sol";

/**
 * @title Upgradeable2Step
 * @notice This contract implements a two-step process for upgrading the implementation address. It provides security by allowing the owner to propose a new implementation and the implementation to accept itself.
 * @dev Inherits from `Ownable2Step`, allowing the contract owner to initiate the upgrade process, which must then be accepted by the proposed implementation.
 */
contract Upgradeable2Step is Ownable2Step {

    /// @notice The slot containing the address of the pending implementation contract.
    bytes32 public constant PENDING_IMPLEMENTATION_SLOT = keccak256("PENDING_IMPLEMENTATION_SLOT");

    /// @notice The slot containing the address of the current implementation contract.
    bytes32 public constant IMPLEMENTATION_SLOT = keccak256("IMPLEMENTATION_SLOT");

    /**
     * @dev Emitted when a new implementation is proposed.
     * @param previousImplementation The address of the previous implementation.
     * @param newImplementation The address of the new implementation proposed.
     */
    event ReplaceImplementationStarted(address indexed previousImplementation, address indexed newImplementation);

    /**
     * @dev Emitted when a new implementation is accepted and becomes active.
     * @param previousImplementation The address of the previous implementation.
     * @param newImplementation The address of the new active implementation.
     */
    event ReplaceImplementation(address indexed previousImplementation, address indexed newImplementation);

    /**
     * @dev Thrown when an unauthorized account attempts to execute a restricted function.
     */
    error Unauthorized();
      
    /**
     * @notice Initializes the contract and sets the deployer as the initial owner.
     * @dev Passes the deployer address to the `Ownable2Step` constructor.
     */
    constructor() Ownable(msg.sender) {}

    /**
     * @notice Starts the implementation replacement process by setting a new pending implementation address.
     * @dev Can only be called by the owner. Emits the `ReplaceImplementationStarted` event.
     * @param impl_ The address of the new implementation contract to be set as pending.
     */
    function replaceImplementation(address impl_) public onlyOwner {
        bytes32 slot_pending = PENDING_IMPLEMENTATION_SLOT;
        assembly {
            sstore(slot_pending, impl_)
        }
        emit ReplaceImplementationStarted(implementation(), impl_);
    }

    /**
     * @notice Completes the implementation replacement process by accepting the pending implementation.
     * @dev Can only be called by the pending implementation itself. Emits the `ReplaceImplementation` event and updates the `implementation` state.
     *      Deletes the `pendingImplementation` address upon successful acceptance.
     */
    function acceptImplementation() public {
        if (msg.sender != pendingImplementation()) {
            revert OwnableUnauthorizedAccount(msg.sender);
        }
        emit ReplaceImplementation(implementation(), msg.sender);

        bytes32 slot_pending = PENDING_IMPLEMENTATION_SLOT;
        bytes32 slot = IMPLEMENTATION_SLOT;
        assembly {
            sstore(slot_pending, 0)
            sstore(slot, caller())
        }
    }

    /**
     * @notice Allows a new implementation to become the active implementation in a proxy contract.
     * @dev Can only be called by the owner of the specified proxy contract. Calls `acceptImplementation` on the proxy contract.
     * @param proxy The proxy contract where the new implementation should be accepted.
     */
    function becomeImplementation(Upgradeable2Step proxy) public {
        if (msg.sender != proxy.owner()) {
            revert Unauthorized();
        }
        proxy.acceptImplementation();
    }

    /**
     * @notice Returns the pending implementation address
     * @return The pending implementation address
     */
    function pendingImplementation() public view returns (address) {
        address pendingImplementation_;
        bytes32 slot_pending = PENDING_IMPLEMENTATION_SLOT;
        assembly {
            pendingImplementation_ := sload(slot_pending)
        }
        return pendingImplementation_;
    }

    /**
     * @notice Returns the current implementation address
     * @return The current implementation address
     */
    function implementation() public view returns (address) {
        address implementation_;
        bytes32 slot = IMPLEMENTATION_SLOT;
        assembly {
            implementation_ := sload(slot)
        }
        return implementation_;
    }
}

File 3 of 11 : Ownable2Step.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (access/Ownable2Step.sol)

pragma solidity ^0.8.20;

import {Ownable} from "contracts/access/Ownable.sol";

/**
 * @dev Contract module which provides access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * The initial owner is specified at deployment time in the constructor for `Ownable`. This
 * can later be changed with {transferOwnership} and {acceptOwnership}.
 *
 * This module is used through inheritance. It will make available all functions
 * from parent (Ownable).
 */
abstract contract Ownable2Step is Ownable {
    address private _pendingOwner;

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

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

    /**
     * @dev Starts the ownership transfer of the contract to a new account. Replaces the pending transfer if there is one.
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual override onlyOwner {
        _pendingOwner = newOwner;
        emit OwnershipTransferStarted(owner(), newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`) and deletes any pending owner.
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual override {
        delete _pendingOwner;
        super._transferOwnership(newOwner);
    }

    /**
     * @dev The new owner accepts the ownership transfer.
     */
    function acceptOwnership() public virtual {
        address sender = _msgSender();
        if (pendingOwner() != sender) {
            revert OwnableUnauthorizedAccount(sender);
        }
        _transferOwnership(sender);
    }
}

File 4 of 11 : Ownable.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (access/Ownable.sol)

pragma solidity ^0.8.20;

import {Context} from "contracts/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.
 *
 * The initial owner is set to the address provided by the deployer. 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;

    /**
     * @dev The caller account is not authorized to perform an operation.
     */
    error OwnableUnauthorizedAccount(address account);

    /**
     * @dev The owner is not a valid owner account. (eg. `address(0)`)
     */
    error OwnableInvalidOwner(address owner);

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

    /**
     * @dev Initializes the contract setting the address provided by the deployer as the initial owner.
     */
    constructor(address initialOwner) {
        if (initialOwner == address(0)) {
            revert OwnableInvalidOwner(address(0));
        }
        _transferOwnership(initialOwner);
    }

    /**
     * @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 {
        if (owner() != _msgSender()) {
            revert OwnableUnauthorizedAccount(_msgSender());
        }
    }

    /**
     * @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 {
        if (newOwner == address(0)) {
            revert OwnableInvalidOwner(address(0));
        }
        _transferOwnership(newOwner);
    }

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

File 5 of 11 : Context.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.1) (utils/Context.sol)

pragma solidity ^0.8.20;

/**
 * @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;
    }

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

File 6 of 11 : IOFT.sol
// SPDX-License-Identifier: GPL-3.0-only

pragma solidity 0.8.26;

import { IERC20 } from "contracts/token/ERC20/IERC20.sol";

interface IOFT is IERC20 {

    /**
    * @dev Struct representing token parameters for the OFT send() operation.
    */
    struct SendParam {
        uint32 dstEid; // Destination endpoint ID.
        bytes32 to; // Recipient address.
        uint256 amountLD; // Amount to send in local decimals.
        uint256 minAmountLD; // Minimum amount to send in local decimals.
        bytes extraOptions; // Additional options supplied by the caller to be used in the LayerZero message.
        bytes composeMsg; // The composed message for the send() operation.
        bytes oftCmd; // The OFT command to be executed, unused in default OFT implementations.
    }

    struct MessagingFee {
        uint nativeFee; // gas amount in native gas token
        uint lzTokenFee; // gas amount in ZRO token
    }

    struct MessagingReceipt {
        bytes32 guid;
        uint64 nonce;
        MessagingFee fee;
    }

    struct OFTReceipt {
        uint256 amountSentLD; // Amount of tokens ACTUALLY debited from the sender in local decimals.
        // @dev In non-default implementations, the amountReceivedLD COULD differ from this value.
        uint256 amountReceivedLD; // Amount of tokens to be received on the remote side.
    }

    // @dev executes a cross-chain OFT swap via layerZero Endpoint
    function send(SendParam calldata _sendParam, MessagingFee calldata _fee, address _refundAddress) external payable returns (MessagingReceipt memory msgReceipt, OFTReceipt memory oftReceipt);

    /**
    * @notice Provides a quote for the send() operation.
    * @param _sendParam The parameters for the send() operation.
    * @param _payInLzToken Flag indicating whether the caller is paying in the LZ token.
    * @return msgFee The calculated LayerZero messaging fee from the send() operation.
    *
    * @dev MessagingFee: LayerZero msg fee
    *  - nativeFee: The native fee.
    *  - lzTokenFee: The lzToken fee.
    */
    function quoteSend(SendParam calldata _sendParam, bool _payInLzToken) external view returns (MessagingFee memory msgFee);

    /**
     * @dev Retrieves the address of the underlying ERC20 implementation.
     * @return The address of the adapted ERC-20 token.
     *
     * @dev In the case of OFT, address(this) and erc20 are the same contract.
     * @dev In the case of OFTAdapter, address(this) and erc20 are NOT the same contract.
     */
    function token() external view returns (address);

    /**
     * @notice Indicates whether the OFT contract requires approval of the 'token()' to send.
     * @return requiresApproval Needs approval of the underlying token implementation.
     *
     * @dev In the case of OFT where the contract IS the token, approval is NOT required.
     * @dev In the case of default OFTAdapter, approval is required.
     * @dev In non-default OFTAdapter contracts with something like mint and burn privileges, it would NOT need approval.
     */
    function approvalRequired() external pure virtual returns (bool);
}

File 7 of 11 : IERC20.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.20;

/**
 * @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 value of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

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

    /**
     * @dev Moves a `value` amount of 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 value) 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 a `value` amount of tokens 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 value) external returns (bool);

    /**
     * @dev Moves a `value` amount of tokens from `from` to `to` using the
     * allowance mechanism. `value` 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 value) external returns (bool);
}

File 8 of 11 : Rescuable.sol
// SPDX-License-Identifier: MIT

pragma solidity 0.8.26;

import "contracts/token/ERC20/utils/SafeERC20.sol";

abstract contract Rescuable {
    using SafeERC20 for IERC20;

    /**
     * @notice Override this function in inheriting contracts to set appropriate permissions
     */
    function _requireRescuerRole() internal view virtual;

    /**
     * @notice Allows the rescue of ERC20 tokens held by the contract
     * @param token The ERC20 token to be rescued
     */
    function rescue(IERC20 token) external {
        _requireRescuerRole();
        uint256 balance = token.balanceOf(address(this));
        token.safeTransfer(msg.sender, balance);
    }

    /**
     * @notice Allows the rescue of Ether held by the contract
     */
    function rescueEth() external{
        _requireRescuerRole();
        uint256 balance = address(this).balance;
        (bool success, ) = msg.sender.call{value: balance}("");
        require(success, "Transfer failed");
    }
}

File 9 of 11 : SafeERC20.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.20;

import {IERC20} from "contracts/token/ERC20/IERC20.sol";
import {IERC20Permit} from "contracts/token/ERC20/extensions/IERC20Permit.sol";
import {Address} from "contracts/utils/Address.sol";

/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20 {
    using Address for address;

    /**
     * @dev An operation with an ERC20 token failed.
     */
    error SafeERC20FailedOperation(address token);

    /**
     * @dev Indicates a failed `decreaseAllowance` request.
     */
    error SafeERC20FailedDecreaseAllowance(address spender, uint256 currentAllowance, uint256 requestedDecrease);

    /**
     * @dev Transfer `value` amount of `token` from the calling contract to `to`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeTransfer(IERC20 token, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeCall(token.transfer, (to, value)));
    }

    /**
     * @dev Transfer `value` amount of `token` from `from` to `to`, spending the approval given by `from` to the
     * calling contract. If `token` returns no value, non-reverting calls are assumed to be successful.
     */
    function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeCall(token.transferFrom, (from, to, value)));
    }

    /**
     * @dev Increase the calling contract's allowance toward `spender` by `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 oldAllowance = token.allowance(address(this), spender);
        forceApprove(token, spender, oldAllowance + value);
    }

    /**
     * @dev Decrease the calling contract's allowance toward `spender` by `requestedDecrease`. If `token` returns no
     * value, non-reverting calls are assumed to be successful.
     */
    function safeDecreaseAllowance(IERC20 token, address spender, uint256 requestedDecrease) internal {
        unchecked {
            uint256 currentAllowance = token.allowance(address(this), spender);
            if (currentAllowance < requestedDecrease) {
                revert SafeERC20FailedDecreaseAllowance(spender, currentAllowance, requestedDecrease);
            }
            forceApprove(token, spender, currentAllowance - requestedDecrease);
        }
    }

    /**
     * @dev Set the calling contract's allowance toward `spender` to `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful. Meant to be used with tokens that require the approval
     * to be set to zero before setting it to a non-zero value, such as USDT.
     */
    function forceApprove(IERC20 token, address spender, uint256 value) internal {
        bytes memory approvalCall = abi.encodeCall(token.approve, (spender, value));

        if (!_callOptionalReturnBool(token, approvalCall)) {
            _callOptionalReturn(token, abi.encodeCall(token.approve, (spender, 0)));
            _callOptionalReturn(token, approvalCall);
        }
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We use {Address-functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.

        bytes memory returndata = address(token).functionCall(data);
        if (returndata.length != 0 && !abi.decode(returndata, (bool))) {
            revert SafeERC20FailedOperation(address(token));
        }
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     *
     * This is a variant of {_callOptionalReturn} that silents catches all reverts and returns a bool instead.
     */
    function _callOptionalReturnBool(IERC20 token, bytes memory data) private returns (bool) {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We cannot use {Address-functionCall} here since this should return false
        // and not revert is the subcall reverts.

        (bool success, bytes memory returndata) = address(token).call(data);
        return success && (returndata.length == 0 || abi.decode(returndata, (bool))) && address(token).code.length > 0;
    }
}

File 10 of 11 : IERC20Permit.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (token/ERC20/extensions/IERC20Permit.sol)

pragma solidity ^0.8.20;

/**
 * @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.
 *
 * ==== Security Considerations
 *
 * There are two important considerations concerning the use of `permit`. The first is that a valid permit signature
 * expresses an allowance, and it should not be assumed to convey additional meaning. In particular, it should not be
 * considered as an intention to spend the allowance in any specific way. The second is that because permits have
 * built-in replay protection and can be submitted by anyone, they can be frontrun. A protocol that uses permits should
 * take this into consideration and allow a `permit` call to fail. Combining these two aspects, a pattern that may be
 * generally recommended is:
 *
 * ```solidity
 * function doThingWithPermit(..., uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s) public {
 *     try token.permit(msg.sender, address(this), value, deadline, v, r, s) {} catch {}
 *     doThing(..., value);
 * }
 *
 * function doThing(..., uint256 value) public {
 *     token.safeTransferFrom(msg.sender, address(this), value);
 *     ...
 * }
 * ```
 *
 * Observe that: 1) `msg.sender` is used as the owner, leaving no ambiguity as to the signer intent, and 2) the use of
 * `try/catch` allows the permit to fail and makes the code tolerant to frontrunning. (See also
 * {SafeERC20-safeTransferFrom}).
 *
 * Additionally, note that smart contract wallets (such as Argent or Safe) are not able to produce permit signatures, so
 * contracts should have entry points that don't rely on permit.
 */
interface IERC20Permit {
    /**
     * @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].
     *
     * CAUTION: See Security Considerations above.
     */
    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);
}

File 11 of 11 : Address.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (utils/Address.sol)

pragma solidity ^0.8.20;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev The ETH balance of the account is not enough to perform the operation.
     */
    error AddressInsufficientBalance(address account);

    /**
     * @dev There's no code at `target` (it is not a contract).
     */
    error AddressEmptyCode(address target);

    /**
     * @dev A call to an address target failed. The target may have reverted.
     */
    error FailedInnerCall();

    /**
     * @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://consensys.net/diligence/blog/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/v0.8.20/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        if (address(this).balance < amount) {
            revert AddressInsufficientBalance(address(this));
        }

        (bool success, ) = recipient.call{value: amount}("");
        if (!success) {
            revert FailedInnerCall();
        }
    }

    /**
     * @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 or custom error, it is bubbled
     * up by this function (like regular Solidity function calls). However, if
     * the call reverted with no returned reason, this function reverts with a
     * {FailedInnerCall} error.
     *
     * 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.
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0);
    }

    /**
     * @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`.
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
        if (address(this).balance < value) {
            revert AddressInsufficientBalance(address(this));
        }
        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResultFromTarget(target, success, returndata);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResultFromTarget(target, success, returndata);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResultFromTarget(target, success, returndata);
    }

    /**
     * @dev Tool to verify that a low level call to smart-contract was successful, and reverts if the target
     * was not a contract or bubbling up the revert reason (falling back to {FailedInnerCall}) in case of an
     * unsuccessful call.
     */
    function verifyCallResultFromTarget(
        address target,
        bool success,
        bytes memory returndata
    ) internal view returns (bytes memory) {
        if (!success) {
            _revert(returndata);
        } else {
            // only check if target is a contract if the call was successful and the return data is empty
            // otherwise we already know that it was a contract
            if (returndata.length == 0 && target.code.length == 0) {
                revert AddressEmptyCode(target);
            }
            return returndata;
        }
    }

    /**
     * @dev Tool to verify that a low level call was successful, and reverts if it wasn't, either by bubbling the
     * revert reason or with a default {FailedInnerCall} error.
     */
    function verifyCallResult(bool success, bytes memory returndata) internal pure returns (bytes memory) {
        if (!success) {
            _revert(returndata);
        } else {
            return returndata;
        }
    }

    /**
     * @dev Reverts with returndata if present. Otherwise reverts with {FailedInnerCall}.
     */
    function _revert(bytes memory returndata) private pure {
        // 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 FailedInnerCall();
        }
    }
}

Settings
{
  "evmVersion": "shanghai",
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "libraries": {
    "LzOftHelper.sol": {}
  },
  "remappings": [
    "@openzeppelin=./node_modules/@openzeppelin",
    "@erc721a=./node_modules/erc721a/contracts",
    "OpenZeppelin=C:/Users/tomcb/.brownie/packages/OpenZeppelin",
    "paulrberg=C:/Users/tomcb/.brownie/packages/paulrberg"
  ],
  "metadata": {
    "appendCBOR": false,
    "bytecodeHash": "none"
  },
  "outputSelection": {
    "*": {
      "*": [
        "abi"
      ]
    }
  }
}

Contract Security Audit

Contract ABI

[{"inputs":[{"internalType":"address","name":"target","type":"address"}],"name":"AddressEmptyCode","type":"error"},{"inputs":[{"internalType":"address","name":"account","type":"address"}],"name":"AddressInsufficientBalance","type":"error"},{"inputs":[],"name":"FailedInnerCall","type":"error"},{"inputs":[{"internalType":"address","name":"owner","type":"address"}],"name":"OwnableInvalidOwner","type":"error"},{"inputs":[{"internalType":"address","name":"account","type":"address"}],"name":"OwnableUnauthorizedAccount","type":"error"},{"inputs":[{"internalType":"address","name":"token","type":"address"}],"name":"SafeERC20FailedOperation","type":"error"},{"inputs":[],"name":"Unauthorized","type":"error"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferStarted","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousImplementation","type":"address"},{"indexed":true,"internalType":"address","name":"newImplementation","type":"address"}],"name":"ReplaceImplementation","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousImplementation","type":"address"},{"indexed":true,"internalType":"address","name":"newImplementation","type":"address"}],"name":"ReplaceImplementationStarted","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"oftContract","type":"address"},{"indexed":true,"internalType":"bool","name":"isEnabled","type":"bool"}],"name":"ToggleOFTContract","type":"event"},{"inputs":[],"name":"IMPLEMENTATION_SLOT","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"PENDING_IMPLEMENTATION_SLOT","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"acceptImplementation","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"acceptOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_addr","type":"address"}],"name":"addressToBytes32","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"pure","type":"function"},{"inputs":[{"internalType":"contract IOFT","name":"","type":"address"}],"name":"allowedOFTs","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"contract Upgradeable2Step","name":"proxy","type":"address"}],"name":"becomeImplementation","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"implementation","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"pendingImplementation","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"pendingOwner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"contract IOFT","name":"oftContract","type":"address"},{"components":[{"internalType":"uint32","name":"dstEid","type":"uint32"},{"internalType":"bytes32","name":"to","type":"bytes32"},{"internalType":"uint256","name":"amountLD","type":"uint256"},{"internalType":"uint256","name":"minAmountLD","type":"uint256"},{"internalType":"bytes","name":"extraOptions","type":"bytes"},{"internalType":"bytes","name":"composeMsg","type":"bytes"},{"internalType":"bytes","name":"oftCmd","type":"bytes"}],"internalType":"struct IOFT.SendParam","name":"_sendParam","type":"tuple"}],"name":"quoteSend","outputs":[{"components":[{"internalType":"uint256","name":"nativeFee","type":"uint256"},{"internalType":"uint256","name":"lzTokenFee","type":"uint256"}],"internalType":"struct IOFT.MessagingFee","name":"msgFee","type":"tuple"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"impl_","type":"address"}],"name":"replaceImplementation","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"contract IERC20","name":"token","type":"address"}],"name":"rescue","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"rescueEth","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"contract IOFT","name":"oftContract","type":"address"},{"components":[{"internalType":"uint32","name":"dstEid","type":"uint32"},{"internalType":"bytes32","name":"to","type":"bytes32"},{"internalType":"uint256","name":"amountLD","type":"uint256"},{"internalType":"uint256","name":"minAmountLD","type":"uint256"},{"internalType":"bytes","name":"extraOptions","type":"bytes"},{"internalType":"bytes","name":"composeMsg","type":"bytes"},{"internalType":"bytes","name":"oftCmd","type":"bytes"}],"internalType":"struct IOFT.SendParam","name":"_sendParam","type":"tuple"}],"name":"send","outputs":[{"components":[{"internalType":"bytes32","name":"guid","type":"bytes32"},{"internalType":"uint64","name":"nonce","type":"uint64"},{"components":[{"internalType":"uint256","name":"nativeFee","type":"uint256"},{"internalType":"uint256","name":"lzTokenFee","type":"uint256"}],"internalType":"struct IOFT.MessagingFee","name":"fee","type":"tuple"}],"internalType":"struct IOFT.MessagingReceipt","name":"msgReceipt","type":"tuple"},{"components":[{"internalType":"uint256","name":"amountSentLD","type":"uint256"},{"internalType":"uint256","name":"amountReceivedLD","type":"uint256"}],"internalType":"struct IOFT.OFTReceipt","name":"oftReceipt","type":"tuple"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"contract IOFT","name":"oftContract_","type":"address"},{"internalType":"bool","name":"isEnabled_","type":"bool"}],"name":"toggleOFTContract","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"stateMutability":"payable","type":"receive"}]

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A contract address hosts a smart contract, which is a set of code stored on the blockchain that runs when predetermined conditions are met. Learn more about addresses in our Knowledge Base.