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Outline

•    - function _msgSender()
•    - function _msgData()
•    - function owner()
•    - function renounceOwnership()
•    - function transferOwnership(address ne ...
•    - function _setOwner(address newOwner)
• interface IERC165
•    - function supportsInterface(bytes4 int ...
•    - function supportsInterface(bytes4 int ...
• interface INFTExtension is IERC165
• interface INFTURIExtension is INFTExt ...
•    - function tokenURI(uint256 tokenId)
• interface IERC721 is IERC165
•    - function balanceOf(address owner)
•    - function ownerOf(uint256 tokenId)
•    - function safeTransferFrom(
•    - function transferFrom(
•    - function approve(address to, uint256 ...
•    - function getApproved(uint256 tokenId)
•    - function setApprovalForAll(address op ...
•    - function isApprovedForAll(address own ...
•    - function safeTransferFrom(
• interface IAvatarNFT
•    - function DEVELOPER()
•    - function DEVELOPER_ADDRESS()
•    - function saleStarted()
•    - function isExtensionAdded(address ext ...
•    - function data(uint256 tokenId)
•    - function mintExternal(
•    - function addExtension(address extensi ...
•    - function revokeExtension(address exte ...
•    - function withdraw()
• interface IMetaverseNFT is IAvatarNFT
•    - function royaltyInfo(uint256 tokenId, ...
•    - function setRoyaltyReceiver(address r ...
•    - function setRoyaltyFee(uint256 fee)
•  contract NFTExtension is INFTExten ...
•    - function beforeMint()
•    - function supportsInterface(bytes4 int ...
•    - function updateStartTimestamp(uint256 ...
•    - function startSale()
•    - function stopSale()
•    - function saleStarted()
• interface NFT is IMetaverseNFT
•    - function maxSupply()
•    - function totalSupply()
•  contract LimitedSupplyMintingExten ... *
•    - function mint(uint256 nTokens)
•    - function maxSupply()
•    - function totalSupply()

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/**
 *Submitted for verification at Etherscan.io on 2022-07-18
*/

// SPDX-License-Identifier: MIXED

// Sources flattened with hardhat v2.9.3 https://hardhat.org

// File @openzeppelin/contracts/utils/[email protected]

// License-Identifier: MIT

pragma solidity ^0.8.0;

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

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


// File @openzeppelin/contracts/access/[email protected]

// License-Identifier: MIT

pragma solidity ^0.8.0;

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

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

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

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

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
        _;
    }

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

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

    function _setOwner(address newOwner) private {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}


// File @openzeppelin/contracts/utils/introspection/[email protected]

// License-Identifier: MIT

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);
}


// File @openzeppelin/contracts/utils/introspection/[email protected]

// License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @dev Implementation of the {IERC165} interface.
 *
 * Contracts that want to implement ERC165 should inherit from this contract and override {supportsInterface} to check
 * for the additional interface id that will be supported. For example:
 *
 * ```solidity
 * function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
 *     return interfaceId == type(MyInterface).interfaceId || super.supportsInterface(interfaceId);
 * }
 * ```
 *
 * Alternatively, {ERC165Storage} provides an easier to use but more expensive implementation.
 */
abstract contract ERC165 is IERC165 {
    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        return interfaceId == type(IERC165).interfaceId;
    }
}


// File contracts/interfaces/INFTExtension.sol

// License-Identifier: MIT
pragma solidity ^0.8.9;

interface INFTExtension is IERC165 {
}

interface INFTURIExtension is INFTExtension {
    function tokenURI(uint256 tokenId) external view returns (string memory);
}


// File @openzeppelin/contracts/token/ERC721/[email protected]

// License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @dev Required interface of an ERC721 compliant contract.
 */
interface IERC721 is IERC165 {
    /**
     * @dev Emitted when `tokenId` token is transferred from `from` to `to`.
     */
    event Transfer(address indexed from, address indexed to, uint256 indexed tokenId);

    /**
     * @dev Emitted when `owner` enables `approved` to manage the `tokenId` token.
     */
    event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId);

    /**
     * @dev Emitted when `owner` enables or disables (`approved`) `operator` to manage all of its assets.
     */
    event ApprovalForAll(address indexed owner, address indexed operator, bool approved);

    /**
     * @dev Returns the number of tokens in ``owner``'s account.
     */
    function balanceOf(address owner) external view returns (uint256 balance);

    /**
     * @dev Returns the owner of the `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function ownerOf(uint256 tokenId) external view returns (address owner);

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
     * are aware of the ERC721 protocol to prevent tokens from being forever locked.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If the caller is not `from`, it must be have been allowed to move this token by either {approve} or {setApprovalForAll}.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId
    ) external;

    /**
     * @dev Transfers `tokenId` token from `from` to `to`.
     *
     * WARNING: Usage of this method is discouraged, use {safeTransferFrom} whenever possible.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(
        address from,
        address to,
        uint256 tokenId
    ) external;

    /**
     * @dev Gives permission to `to` to transfer `tokenId` token to another account.
     * The approval is cleared when the token is transferred.
     *
     * Only a single account can be approved at a time, so approving the zero address clears previous approvals.
     *
     * Requirements:
     *
     * - The caller must own the token or be an approved operator.
     * - `tokenId` must exist.
     *
     * Emits an {Approval} event.
     */
    function approve(address to, uint256 tokenId) external;

    /**
     * @dev Returns the account approved for `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function getApproved(uint256 tokenId) external view returns (address operator);

    /**
     * @dev Approve or remove `operator` as an operator for the caller.
     * Operators can call {transferFrom} or {safeTransferFrom} for any token owned by the caller.
     *
     * Requirements:
     *
     * - The `operator` cannot be the caller.
     *
     * Emits an {ApprovalForAll} event.
     */
    function setApprovalForAll(address operator, bool _approved) external;

    /**
     * @dev Returns if the `operator` is allowed to manage all of the assets of `owner`.
     *
     * See {setApprovalForAll}
     */
    function isApprovedForAll(address owner, address operator) external view returns (bool);

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId,
        bytes calldata data
    ) external;
}


// File contracts/interfaces/IMetaverseNFT.sol

// License-Identifier: MIT
pragma solidity ^0.8.9;

interface IAvatarNFT {
    function DEVELOPER() external pure returns (string memory _url);

    function DEVELOPER_ADDRESS() external pure returns (address payable _dev);

    // ------ View functions ------
    function saleStarted() external view returns (bool);

    function isExtensionAdded(address extension) external view returns (bool);

    /**
        Extra information stored for each tokenId. Optional, provided on mint
     */
    function data(uint256 tokenId) external view returns (bytes32);

    // ------ Mint functions ------
    /**
        Mint from NFTExtension contract. Optionally provide data parameter.
     */
    function mintExternal(
        uint256 tokenId,
        address to,
        bytes32 data
    ) external payable;

    // ------ Admin functions ------
    function addExtension(address extension) external;

    function revokeExtension(address extension) external;

    function withdraw() external;
}

interface IMetaverseNFT is IAvatarNFT {
    // ------ View functions ------
    /**
        Recommended royalty for tokenId sale.
     */
    function royaltyInfo(uint256 tokenId, uint256 salePrice)
        external
        view
        returns (address receiver, uint256 royaltyAmount);

    // ------ Admin functions ------
    function setRoyaltyReceiver(address receiver) external;

    function setRoyaltyFee(uint256 fee) external;
}


// File contracts/extensions/base/NFTExtension.sol

// License-Identifier: MIT
pragma solidity ^0.8.9;


contract NFTExtension is INFTExtension, ERC165 {
    IMetaverseNFT public immutable nft;

    constructor(address _nft) {
        nft = IMetaverseNFT(_nft);
    }

    function beforeMint() internal view {
        require(nft.isExtensionAdded(address(this)), "NFTExtension: this contract is not allowed to be used as an extension");
    }

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

}


// File contracts/extensions/base/SaleControl.sol

// License-Identifier: MIT
pragma solidity ^0.8.9;

abstract contract SaleControl is Ownable {

    uint256 public constant __SALE_NEVER_STARTS = 2**256 - 1;

    uint256 public startTimestamp = __SALE_NEVER_STARTS;

    modifier whenSaleStarted {
        require(saleStarted(), "Sale not started yet");
        _;
    }

    function updateStartTimestamp(uint256 _startTimestamp) public onlyOwner {
        startTimestamp = _startTimestamp;
    }

    function startSale() public onlyOwner {
        startTimestamp = block.timestamp;
    }

    function stopSale() public onlyOwner {
        startTimestamp = __SALE_NEVER_STARTS;
    }

    function saleStarted() public view returns (bool) {
        return block.timestamp >= startTimestamp;
    }
}


// File contracts/extensions/LimitedSupplyMintingExtension.sol

// License-Identifier: MIT
pragma solidity ^0.8.9;


interface NFT is IMetaverseNFT {
    function maxSupply() external view returns (uint256);
    function totalSupply() external view returns (uint256);
}

contract LimitedSupplyMintingExtension is NFTExtension, Ownable, SaleControl {

    uint256 public price;
    uint256 public maxPerMint;
    uint256 public maxPerWallet;
    uint256 public totalMinted;
    uint256 public extensionSupply;

    constructor(address _nft, uint256 _price, uint256 _maxPerMint, uint256 _maxPerWallet, uint256 _extensionSupply) NFTExtension(_nft) {
        stopSale();
        // sale stopped by default

        price = _price;
        maxPerMint = _maxPerMint;
        maxPerWallet = _maxPerWallet;
        extensionSupply = _extensionSupply;
    }

    function mint(uint256 nTokens) external whenSaleStarted payable {
        require(IERC721(address(nft)).balanceOf(msg.sender) + nTokens <= maxPerWallet, "LimitedSupplyMintingExtension: max per wallet reached");

        require(nTokens + totalMinted <= extensionSupply, "max extensionSupply reached");
        require(nTokens <= maxPerMint, "Too many tokens to mint");
        require(msg.value >= nTokens * price, "Not enough ETH to mint");

        totalMinted += nTokens;

        nft.mintExternal{ value: msg.value }(nTokens, msg.sender, bytes32(0x0));
    }

    function maxSupply() public view returns (uint256) {
        return NFT(address(nft)).maxSupply();
    }

    function totalSupply() public view returns (uint256) {
        return NFT(address(nft)).totalSupply();
    }

}

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[{"inputs":[{"internalType":"address","name":"_nft","type":"address"},{"internalType":"uint256","name":"_price","type":"uint256"},{"internalType":"uint256","name":"_maxPerMint","type":"uint256"},{"internalType":"uint256","name":"_maxPerWallet","type":"uint256"},{"internalType":"uint256","name":"_extensionSupply","type":"uint256"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"inputs":[],"name":"__SALE_NEVER_STARTS","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"extensionSupply","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"maxPerMint","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"maxPerWallet","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"maxSupply","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"nTokens","type":"uint256"}],"name":"mint","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[],"name":"nft","outputs":[{"internalType":"contract IMetaverseNFT","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"price","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"saleStarted","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"startSale","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"startTimestamp","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"stopSale","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes4","name":"interfaceId","type":"bytes4"}],"name":"supportsInterface","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalMinted","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalSupply","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_startTimestamp","type":"uint256"}],"name":"updateStartTimestamp","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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-----Decoded View---------------
Arg [0] : _nft (address): 0x869bd51b894bAE89433372629C8Cd33fE215Cb56
Arg [1] : _price (uint256): 1000000000000000
Arg [2] : _maxPerMint (uint256): 50
Arg [3] : _maxPerWallet (uint256): 100
Arg [4] : _extensionSupply (uint256): 4000

-----Encoded View---------------
5 Constructor Arguments found :
Arg [0] : 000000000000000000000000869bd51b894bae89433372629c8cd33fe215cb56
Arg [1] : 00000000000000000000000000000000000000000000000000038d7ea4c68000
Arg [2] : 0000000000000000000000000000000000000000000000000000000000000032
Arg [3] : 0000000000000000000000000000000000000000000000000000000000000064
Arg [4] : 0000000000000000000000000000000000000000000000000000000000000fa0