Contract Address Details

// File: contracts/Spaceguinz.sol

// SPDX-License-Identifier: MIT


// File: @openzeppelin/contracts/security/ReentrancyGuard.sol


// OpenZeppelin Contracts v4.4.1 (security/ReentrancyGuard.sol)

pragma solidity ^0.8.7

;



/**

 * @dev Contract module that helps prevent reentrant calls to a function.

 *

 * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier

 * available, which can be applied to functions to make sure there are no nested

 * (reentrant) calls to them.

 *

 * Note that because there is a single `nonReentrant` guard, functions marked as

 * `nonReentrant` may not call one another. This can be worked around by making

 * those functions `private`, and then adding `external` `nonReentrant` entry

 * points to them.

 *

 * TIP: If you would like to learn more about reentrancy and alternative ways

 * to protect against it, check out our blog post

 * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].

 */

abstract contract ReentrancyGuard {

    // Booleans are more expensive than uint256 or any type that takes up a full

    // word because each write operation emits an extra SLOAD to first read the

    // slot's contents, replace the bits taken up by the boolean, and then write

    // back. This is the compiler's defense against contract upgrades and

    // pointer aliasing, and it cannot be disabled.



    // The values being non-zero value makes deployment a bit more expensive,

    // but in exchange the refund on every call to nonReentrant will be lower in

    // amount. Since refunds are capped to a percentage of the total

    // transaction's gas, it is best to keep them low in cases like this one, to

    // increase the likelihood of the full refund coming into effect.

    uint256 private constant _NOT_ENTERED = 1;

    uint256 private constant _ENTERED = 2;



    uint256 private _status;



    constructor() {

        _status = _NOT_ENTERED;

    }



    /**

     * @dev Prevents a contract from calling itself, directly or indirectly.

     * Calling a `nonReentrant` function from another `nonReentrant`

     * function is not supported. It is possible to prevent this from happening

     * by making the `nonReentrant` function external, and making it call a

     * `private` function that does the actual work.

     */

    modifier nonReentrant() {

        // On the first call to nonReentrant, _notEntered will be true

        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");



        // Any calls to nonReentrant after this point will fail

        _status = _ENTERED;



        _;



        // By storing the original value once again, a refund is triggered (see

        // https://eips.ethereum.org/EIPS/eip-2200)

        _status = _NOT_ENTERED;

    }

}



// File: @openzeppelin/contracts/utils/Strings.sol





// OpenZeppelin Contracts v4.4.1 (utils/Strings.sol)



pragma solidity ^0.8.0;



/**

 * @dev String operations.

 */

library Strings {

    bytes16 private constant _HEX_SYMBOLS = "0123456789abcdef";



    /**

     * @dev Converts a `uint256` to its ASCII `string` decimal representation.

     */

    function toString(uint256 value) internal pure returns (string memory) {

        // Inspired by OraclizeAPI's implementation - MIT licence

        // https://github.com/oraclize/ethereum-api/blob/b42146b063c7d6ee1358846c198246239e9360e8/oraclizeAPI_0.4.25.sol



        if (value == 0) {

            return "0";

        }

        uint256 temp = value;

        uint256 digits;

        while (temp != 0) {

            digits++;

            temp /= 10;

        }

        bytes memory buffer = new bytes(digits);

        while (value != 0) {

            digits -= 1;

            buffer[digits] = bytes1(uint8(48 + uint256(value % 10)));

            value /= 10;

        }

        return string(buffer);

    }



    /**

     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.

     */

    function toHexString(uint256 value) internal pure returns (string memory) {

        if (value == 0) {

            return "0x00";

        }

        uint256 temp = value;

        uint256 length = 0;

        while (temp != 0) {

            length++;

            temp >>= 8;

        }

        return toHexString(value, length);

    }



    /**

     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length.

     */

    function toHexString(uint256 value, uint256 length) internal pure returns (string memory) {

        bytes memory buffer = new bytes(2 * length + 2);

        buffer[0] = "0";

        buffer[1] = "x";

        for (uint256 i = 2 * length + 1; i > 1; --i) {

            buffer[i] = _HEX_SYMBOLS[value & 0xf];

            value >>= 4;

        }

        require(value == 0, "Strings: hex length insufficient");

        return string(buffer);

    }

}



// File: @openzeppelin/contracts/utils/Context.sol





// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)



pragma solidity ^0.8.0;



/**

 * @dev Provides information about the current execution context, including the

 * sender of the transaction and its data. While these are generally available

 * via msg.sender and msg.data, they should not be accessed in such a direct

 * manner, since when dealing with meta-transactions the account sending and

 * paying for execution may not be the actual sender (as far as an application

 * is concerned).

 *

 * This contract is only required for intermediate, library-like contracts.

 */

abstract contract Context {

    function _msgSender() internal view virtual returns (address) {

        return msg.sender;

    }



    function _msgData() internal view virtual returns (bytes calldata) {

        return msg.data;

    }

}



// File: @openzeppelin/contracts/access/Ownable.sol





// OpenZeppelin Contracts v4.4.1 (access/Ownable.sol)



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() {

        _transferOwnership(_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 {

        _transferOwnership(address(0));

    }



    /**

     * @dev Transfers ownership of the contract to a new account (`newOwner`).

     * Can only be called by the current owner.

     */

    function transferOwnership(address newOwner) public virtual onlyOwner {

        require(newOwner != address(0), "Ownable: new owner is the zero address");

        _transferOwnership(newOwner);

    }



    /**

     * @dev Transfers ownership of the contract to a new account (`newOwner`).

     * Internal function without access restriction.

     */

    function _transferOwnership(address newOwner) internal virtual {

        address oldOwner = _owner;

        _owner = newOwner;

        emit OwnershipTransferred(oldOwner, newOwner);

    }

}



// File: @openzeppelin/contracts/utils/Address.sol





// OpenZeppelin Contracts (last updated v4.5.0) (utils/Address.sol)



pragma solidity ^0.8.1;



/**

 * @dev Collection of functions related to the address type

 */

library Address {

    /**

     * @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 Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],

     * but performing a delegate call.

     *

     * _Available since v3.4._

     */

    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {

        return functionDelegateCall(target, data, "Address: low-level delegate call failed");

    }



    /**

     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],

     * but performing a delegate call.

     *

     * _Available since v3.4._

     */

    function functionDelegateCall(

        address target,

        bytes memory data,

        string memory errorMessage

    ) internal returns (bytes memory) {

        require(isContract(target), "Address: delegate call to non-contract");



        (bool success, bytes memory returndata) = target.delegatecall(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



                assembly {

                    let returndata_size := mload(returndata)

                    revert(add(32, returndata), returndata_size)

                }

            } else {

                revert(errorMessage);

            }

        }

    }

}



// File: @openzeppelin/contracts/token/ERC721/IERC721Receiver.sol





// OpenZeppelin Contracts v4.4.1 (token/ERC721/IERC721Receiver.sol)



pragma solidity ^0.8.0;



/**

 * @title ERC721 token receiver interface

 * @dev Interface for any contract that wants to support safeTransfers

 * from ERC721 asset contracts.

 */

interface IERC721Receiver {

    /**

     * @dev Whenever an {IERC721} `tokenId` token is transferred to this contract via {IERC721-safeTransferFrom}

     * by `operator` from `from`, this function is called.

     *

     * It must return its Solidity selector to confirm the token transfer.

     * If any other value is returned or the interface is not implemented by the recipient, the transfer will be reverted.

     *

     * The selector can be obtained in Solidity with `IERC721.onERC721Received.selector`.

     */

    function onERC721Received(

        address operator,

        address from,

        uint256 tokenId,

        bytes calldata data

    ) external returns (bytes4);

}



// File: @openzeppelin/contracts/utils/introspection/IERC165.sol





// 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);

}



// File: @openzeppelin/contracts/utils/introspection/ERC165.sol





// OpenZeppelin Contracts v4.4.1 (utils/introspection/ERC165.sol)



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: @openzeppelin/contracts/token/ERC721/IERC721.sol





// OpenZeppelin Contracts v4.4.1 (token/ERC721/IERC721.sol)



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: @openzeppelin/contracts/token/ERC721/extensions/IERC721Metadata.sol





// OpenZeppelin Contracts v4.4.1 (token/ERC721/extensions/IERC721Metadata.sol)



pragma solidity ^0.8.0;





/**

 * @title ERC-721 Non-Fungible Token Standard, optional metadata extension

 * @dev See https://eips.ethereum.org/EIPS/eip-721

 */

interface IERC721Metadata is IERC721 {

    /**

     * @dev Returns the token collection name.

     */

    function name() external view returns (string memory);



    /**

     * @dev Returns the token collection symbol.

     */

    function symbol() external view returns (string memory);



    /**

     * @dev Returns the Uniform Resource Identifier (URI) for `tokenId` token.

     */

    function tokenURI(uint256 tokenId) external view returns (string memory);

}



// File: erc721a/contracts/ERC721A.sol





// Creator: Chiru Labs



pragma solidity ^0.8.4;

















error ApprovalCallerNotOwnerNorApproved();

error ApprovalQueryForNonexistentToken();

error ApproveToCaller();

error ApprovalToCurrentOwner();

error BalanceQueryForZeroAddress();

error MintToZeroAddress();

error MintZeroQuantity();

error OwnerQueryForNonexistentToken();

error TransferCallerNotOwnerNorApproved();

error TransferFromIncorrectOwner();

error TransferToNonERC721ReceiverImplementer();

error TransferToZeroAddress();

error URIQueryForNonexistentToken();



/**

 * @dev Implementation of https://eips.ethereum.org/EIPS/eip-721[ERC721] Non-Fungible Token Standard, including

 * the Metadata extension. Built to optimize for lower gas during batch mints.

 *

 * Assumes serials are sequentially minted starting at _startTokenId() (defaults to 0, e.g. 0, 1, 2, 3..).

 *

 * Assumes that an owner cannot have more than 2**64 - 1 (max value of uint64) of supply.

 *

 * Assumes that the maximum token id cannot exceed 2**256 - 1 (max value of uint256).

 */

contract ERC721A is Context, ERC165, IERC721, IERC721Metadata {

    using Address for address;

    using Strings for uint256;



    // Compiler will pack this into a single 256bit word.

    struct TokenOwnership {

        // The address of the owner.

        address addr;

        // Keeps track of the start time of ownership with minimal overhead for tokenomics.

        uint64 startTimestamp;

        // Whether the token has been burned.

        bool burned;

    }



    // Compiler will pack this into a single 256bit word.

    struct AddressData {

        // Realistically, 2**64-1 is more than enough.

        uint64 balance;

        // Keeps track of mint count with minimal overhead for tokenomics.

        uint64 numberMinted;

        // Keeps track of burn count with minimal overhead for tokenomics.

        uint64 numberBurned;

        // For miscellaneous variable(s) pertaining to the address

        // (e.g. number of whitelist mint slots used).

        // If there are multiple variables, please pack them into a uint64.

        uint64 aux;

    }



    // The tokenId of the next token to be minted.

    uint256 internal _currentIndex;



    // The number of tokens burned.

    uint256 internal _burnCounter;



    // Token name

    string private _name;



    // Token symbol

    string private _symbol;



    // Mapping from token ID to ownership details

    // An empty struct value does not necessarily mean the token is unowned. See _ownershipOf implementation for details.

    mapping(uint256 => TokenOwnership) internal _ownerships;



    // Mapping owner address to address data

    mapping(address => AddressData) private _addressData;



    // Mapping from token ID to approved address

    mapping(uint256 => address) private _tokenApprovals;



    // Mapping from owner to operator approvals

    mapping(address => mapping(address => bool)) private _operatorApprovals;



    constructor(string memory name_, string memory symbol_) {

        _name = name_;

        _symbol = symbol_;

        _currentIndex = _startTokenId();

    }



    /**

     * To change the starting tokenId, please override this function.

     */

    function _startTokenId() internal view virtual returns (uint256) {

        return 0;

    }



    /**

     * @dev Burned tokens are calculated here, use _totalMinted() if you want to count just minted tokens.

     */

    function totalSupply() public view returns (uint256) {

        // Counter underflow is impossible as _burnCounter cannot be incremented

        // more than _currentIndex - _startTokenId() times

        unchecked {

            return _currentIndex - _burnCounter - _startTokenId();

        }

    }



    /**

     * Returns the total amount of tokens minted in the contract.

     */

    function _totalMinted() internal view returns (uint256) {

        // Counter underflow is impossible as _currentIndex does not decrement,

        // and it is initialized to _startTokenId()

        unchecked {

            return _currentIndex - _startTokenId();

        }

    }



    /**

     * @dev See {IERC165-supportsInterface}.

     */

    function supportsInterface(bytes4 interfaceId) public view virtual override(ERC165, IERC165) returns (bool) {

        return

            interfaceId == type(IERC721).interfaceId ||

            interfaceId == type(IERC721Metadata).interfaceId ||

            super.supportsInterface(interfaceId);

    }



    /**

     * @dev See {IERC721-balanceOf}.

     */

    function balanceOf(address owner) public view override returns (uint256) {

        if (owner == address(0)) revert BalanceQueryForZeroAddress();

        return uint256(_addressData[owner].balance);

    }



    /**

     * Returns the number of tokens minted by `owner`.

     */

    function _numberMinted(address owner) internal view returns (uint256) {

        return uint256(_addressData[owner].numberMinted);

    }



    /**

     * Returns the number of tokens burned by or on behalf of `owner`.

     */

    function _numberBurned(address owner) internal view returns (uint256) {

        return uint256(_addressData[owner].numberBurned);

    }



    /**

     * Returns the auxillary data for `owner`. (e.g. number of whitelist mint slots used).

     */

    function _getAux(address owner) internal view returns (uint64) {

        return _addressData[owner].aux;

    }



    /**

     * Sets the auxillary data for `owner`. (e.g. number of whitelist mint slots used).

     * If there are multiple variables, please pack them into a uint64.

     */

    function _setAux(address owner, uint64 aux) internal {

        _addressData[owner].aux = aux;

    }



    /**

     * Gas spent here starts off proportional to the maximum mint batch size.

     * It gradually moves to O(1) as tokens get transferred around in the collection over time.

     */

    function _ownershipOf(uint256 tokenId) internal view returns (TokenOwnership memory) {

        uint256 curr = tokenId;



        unchecked {

            if (_startTokenId() <= curr && curr < _currentIndex) {

                TokenOwnership memory ownership = _ownerships[curr];

                if (!ownership.burned) {

                    if (ownership.addr != address(0)) {

                        return ownership;

                    }

                    // Invariant:

                    // There will always be an ownership that has an address and is not burned

                    // before an ownership that does not have an address and is not burned.

                    // Hence, curr will not underflow.

                    while (true) {

                        curr--;

                        ownership = _ownerships[curr];

                        if (ownership.addr != address(0)) {

                            return ownership;

                        }

                    }

                }

            }

        }

        revert OwnerQueryForNonexistentToken();

    }



    /**

     * @dev See {IERC721-ownerOf}.

     */

    function ownerOf(uint256 tokenId) public view override returns (address) {

        return _ownershipOf(tokenId).addr;

    }



    /**

     * @dev See {IERC721Metadata-name}.

     */

    function name() public view virtual override returns (string memory) {

        return _name;

    }



    /**

     * @dev See {IERC721Metadata-symbol}.

     */

    function symbol() public view virtual override returns (string memory) {

        return _symbol;

    }



    /**

     * @dev See {IERC721Metadata-tokenURI}.

     */

    function tokenURI(uint256 tokenId) public view virtual override returns (string memory) {

        if (!_exists(tokenId)) revert URIQueryForNonexistentToken();



        string memory baseURI = _baseURI();

        return bytes(baseURI).length != 0 ? string(abi.encodePacked(baseURI, tokenId.toString())) : '';

    }



    /**

     * @dev Base URI for computing {tokenURI}. If set, the resulting URI for each

     * token will be the concatenation of the `baseURI` and the `tokenId`. Empty

     * by default, can be overriden in child contracts.

     */

    function _baseURI() internal view virtual returns (string memory) {

        return '';

    }



    /**

     * @dev See {IERC721-approve}.

     */

    function approve(address to, uint256 tokenId) public override {

        address owner = ERC721A.ownerOf(tokenId);

        if (to == owner) revert ApprovalToCurrentOwner();



        if (_msgSender() != owner && !isApprovedForAll(owner, _msgSender())) {

            revert ApprovalCallerNotOwnerNorApproved();

        }



        _approve(to, tokenId, owner);

    }



    /**

     * @dev See {IERC721-getApproved}.

     */

    function getApproved(uint256 tokenId) public view override returns (address) {

        if (!_exists(tokenId)) revert ApprovalQueryForNonexistentToken();



        return _tokenApprovals[tokenId];

    }



    /**

     * @dev See {IERC721-setApprovalForAll}.

     */

    function setApprovalForAll(address operator, bool approved) public virtual override {

        if (operator == _msgSender()) revert ApproveToCaller();



        _operatorApprovals[_msgSender()][operator] = approved;

        emit ApprovalForAll(_msgSender(), operator, approved);

    }



    /**

     * @dev See {IERC721-isApprovedForAll}.

     */

    function isApprovedForAll(address owner, address operator) public view virtual override returns (bool) {

        return _operatorApprovals[owner][operator];

    }



    /**

     * @dev See {IERC721-transferFrom}.

     */

    function transferFrom(

        address from,

        address to,

        uint256 tokenId

    ) public virtual override {

        _transfer(from, to, tokenId);

    }



    /**

     * @dev See {IERC721-safeTransferFrom}.

     */

    function safeTransferFrom(

        address from,

        address to,

        uint256 tokenId

    ) public virtual override {

        safeTransferFrom(from, to, tokenId, '');

    }



    /**

     * @dev See {IERC721-safeTransferFrom}.

     */

    function safeTransferFrom(

        address from,

        address to,

        uint256 tokenId,

        bytes memory _data

    ) public virtual override {

        _transfer(from, to, tokenId);

        if (to.isContract() && !_checkContractOnERC721Received(from, to, tokenId, _data)) {

            revert TransferToNonERC721ReceiverImplementer();

        }

    }



    /**

     * @dev Returns whether `tokenId` exists.

     *

     * Tokens can be managed by their owner or approved accounts via {approve} or {setApprovalForAll}.

     *

     * Tokens start existing when they are minted (`_mint`),

     */

    function _exists(uint256 tokenId) internal view returns (bool) {

        return _startTokenId() <= tokenId && tokenId < _currentIndex && !_ownerships[tokenId].burned;

    }



    function _safeMint(address to, uint256 quantity) internal {

        _safeMint(to, quantity, '');

    }



    /**

     * @dev Safely mints `quantity` tokens and transfers them to `to`.

     *

     * Requirements:

     *

     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called for each safe transfer.

     * - `quantity` must be greater than 0.

     *

     * Emits a {Transfer} event.

     */

    function _safeMint(

        address to,

        uint256 quantity,

        bytes memory _data

    ) internal {

        _mint(to, quantity, _data, true);

    }



    /**

     * @dev Mints `quantity` tokens and transfers them to `to`.

     *

     * Requirements:

     *

     * - `to` cannot be the zero address.

     * - `quantity` must be greater than 0.

     *

     * Emits a {Transfer} event.

     */

    function _mint(

        address to,

        uint256 quantity,

        bytes memory _data,

        bool safe

    ) internal {

        uint256 startTokenId = _currentIndex;

        if (to == address(0)) revert MintToZeroAddress();

        if (quantity == 0) revert MintZeroQuantity();



        _beforeTokenTransfers(address(0), to, startTokenId, quantity);



        // Overflows are incredibly unrealistic.

        // balance or numberMinted overflow if current value of either + quantity > 1.8e19 (2**64) - 1

        // updatedIndex overflows if _currentIndex + quantity > 1.2e77 (2**256) - 1

        unchecked {

            _addressData[to].balance += uint64(quantity);

            _addressData[to].numberMinted += uint64(quantity);



            _ownerships[startTokenId].addr = to;

            _ownerships[startTokenId].startTimestamp = uint64(block.timestamp);



            uint256 updatedIndex = startTokenId;

            uint256 end = updatedIndex + quantity;



            if (safe && to.isContract()) {

                do {

                    emit Transfer(address(0), to, updatedIndex);

                    if (!_checkContractOnERC721Received(address(0), to, updatedIndex++, _data)) {

                        revert TransferToNonERC721ReceiverImplementer();

                    }

                } while (updatedIndex != end);

                // Reentrancy protection

                if (_currentIndex != startTokenId) revert();

            } else {

                do {

                    emit Transfer(address(0), to, updatedIndex++);

                } while (updatedIndex != end);

            }

            _currentIndex = updatedIndex;

        }

        _afterTokenTransfers(address(0), to, startTokenId, quantity);

    }



    /**

     * @dev Transfers `tokenId` from `from` to `to`.

     *

     * Requirements:

     *

     * - `to` cannot be the zero address.

     * - `tokenId` token must be owned by `from`.

     *

     * Emits a {Transfer} event.

     */

    function _transfer(

        address from,

        address to,

        uint256 tokenId

    ) private {

        TokenOwnership memory prevOwnership = _ownershipOf(tokenId);



        if (prevOwnership.addr != from) revert TransferFromIncorrectOwner();



        bool isApprovedOrOwner = (_msgSender() == from ||

            isApprovedForAll(from, _msgSender()) ||

            getApproved(tokenId) == _msgSender());



        if (!isApprovedOrOwner) revert TransferCallerNotOwnerNorApproved();

        if (to == address(0)) revert TransferToZeroAddress();



        _beforeTokenTransfers(from, to, tokenId, 1);



        // Clear approvals from the previous owner

        _approve(address(0), tokenId, from);



        // Underflow of the sender's balance is impossible because we check for

        // ownership above and the recipient's balance can't realistically overflow.

        // Counter overflow is incredibly unrealistic as tokenId would have to be 2**256.

        unchecked {

            _addressData[from].balance -= 1;

            _addressData[to].balance += 1;



            TokenOwnership storage currSlot = _ownerships[tokenId];

            currSlot.addr = to;

            currSlot.startTimestamp = uint64(block.timestamp);



            // If the ownership slot of tokenId+1 is not explicitly set, that means the transfer initiator owns it.

            // Set the slot of tokenId+1 explicitly in storage to maintain correctness for ownerOf(tokenId+1) calls.

            uint256 nextTokenId = tokenId + 1;

            TokenOwnership storage nextSlot = _ownerships[nextTokenId];

            if (nextSlot.addr == address(0)) {

                // This will suffice for checking _exists(nextTokenId),

                // as a burned slot cannot contain the zero address.

                if (nextTokenId != _currentIndex) {

                    nextSlot.addr = from;

                    nextSlot.startTimestamp = prevOwnership.startTimestamp;

                }

            }

        }



        emit Transfer(from, to, tokenId);

        _afterTokenTransfers(from, to, tokenId, 1);

    }



    /**

     * @dev This is equivalent to _burn(tokenId, false)

     */

    function _burn(uint256 tokenId) internal virtual {

        _burn(tokenId, false);

    }



    /**

     * @dev Destroys `tokenId`.

     * The approval is cleared when the token is burned.

     *

     * Requirements:

     *

     * - `tokenId` must exist.

     *

     * Emits a {Transfer} event.

     */

    function _burn(uint256 tokenId, bool approvalCheck) internal virtual {

        TokenOwnership memory prevOwnership = _ownershipOf(tokenId);



        address from = prevOwnership.addr;



        if (approvalCheck) {

            bool isApprovedOrOwner = (_msgSender() == from ||

                isApprovedForAll(from, _msgSender()) ||

                getApproved(tokenId) == _msgSender());



            if (!isApprovedOrOwner) revert TransferCallerNotOwnerNorApproved();

        }



        _beforeTokenTransfers(from, address(0), tokenId, 1);



        // Clear approvals from the previous owner

        _approve(address(0), tokenId, from);



        // Underflow of the sender's balance is impossible because we check for

        // ownership above and the recipient's balance can't realistically overflow.

        // Counter overflow is incredibly unrealistic as tokenId would have to be 2**256.

        unchecked {

            AddressData storage addressData = _addressData[from];

            addressData.balance -= 1;

            addressData.numberBurned += 1;



            // Keep track of who burned the token, and the timestamp of burning.

            TokenOwnership storage currSlot = _ownerships[tokenId];

            currSlot.addr = from;

            currSlot.startTimestamp = uint64(block.timestamp);

            currSlot.burned = true;



            // If the ownership slot of tokenId+1 is not explicitly set, that means the burn initiator owns it.

            // Set the slot of tokenId+1 explicitly in storage to maintain correctness for ownerOf(tokenId+1) calls.

            uint256 nextTokenId = tokenId + 1;

            TokenOwnership storage nextSlot = _ownerships[nextTokenId];

            if (nextSlot.addr == address(0)) {

                // This will suffice for checking _exists(nextTokenId),

                // as a burned slot cannot contain the zero address.

                if (nextTokenId != _currentIndex) {

                    nextSlot.addr = from;

                    nextSlot.startTimestamp = prevOwnership.startTimestamp;

                }

            }

        }



        emit Transfer(from, address(0), tokenId);

        _afterTokenTransfers(from, address(0), tokenId, 1);



        // Overflow not possible, as _burnCounter cannot be exceed _currentIndex times.

        unchecked {

            _burnCounter++;

        }

    }



    /**

     * @dev Approve `to` to operate on `tokenId`

     *

     * Emits a {Approval} event.

     */

    function _approve(

        address to,

        uint256 tokenId,

        address owner

    ) private {

        _tokenApprovals[tokenId] = to;

        emit Approval(owner, to, tokenId);

    }



    /**

     * @dev Internal function to invoke {IERC721Receiver-onERC721Received} on a target contract.

     *

     * @param from address representing the previous owner of the given token ID

     * @param to target address that will receive the tokens

     * @param tokenId uint256 ID of the token to be transferred

     * @param _data bytes optional data to send along with the call

     * @return bool whether the call correctly returned the expected magic value

     */

    function _checkContractOnERC721Received(

        address from,

        address to,

        uint256 tokenId,

        bytes memory _data

    ) private returns (bool) {

        try IERC721Receiver(to).onERC721Received(_msgSender(), from, tokenId, _data) returns (bytes4 retval) {

            return retval == IERC721Receiver(to).onERC721Received.selector;

        } catch (bytes memory reason) {

            if (reason.length == 0) {

                revert TransferToNonERC721ReceiverImplementer();

            } else {

                assembly {

                    revert(add(32, reason), mload(reason))

                }

            }

        }

    }



    /**

     * @dev Hook that is called before a set of serially-ordered token ids are about to be transferred. This includes minting.

     * And also called before burning one token.

     *

     * startTokenId - the first token id to be transferred

     * quantity - the amount to be transferred

     *

     * Calling conditions:

     *

     * - When `from` and `to` are both non-zero, `from`'s `tokenId` will be

     * transferred to `to`.

     * - When `from` is zero, `tokenId` will be minted for `to`.

     * - When `to` is zero, `tokenId` will be burned by `from`.

     * - `from` and `to` are never both zero.

     */

    function _beforeTokenTransfers(

        address from,

        address to,

        uint256 startTokenId,

        uint256 quantity

    ) internal virtual {}



    /**

     * @dev Hook that is called after a set of serially-ordered token ids have been transferred. This includes

     * minting.

     * And also called after one token has been burned.

     *

     * startTokenId - the first token id to be transferred

     * quantity - the amount to be transferred

     *

     * Calling conditions:

     *

     * - When `from` and `to` are both non-zero, `from`'s `tokenId` has been

     * transferred to `to`.

     * - When `from` is zero, `tokenId` has been minted for `to`.

     * - When `to` is zero, `tokenId` has been burned by `from`.

     * - `from` and `to` are never both zero.

     */

    function _afterTokenTransfers(

        address from,

        address to,

        uint256 startTokenId,

        uint256 quantity

    ) internal virtual {}

}



// File: contracts/no.sol







pragma solidity >=0.8.7

 <0.9.0;









// Smart contract for  Test

contract Spaceguinz is ERC721A, Ownable, ReentrancyGuard {



  using Strings for uint256;



  string public uriPrefix = 'ipfs://bafybeihr6ixzarw47flqzuldnn3pt4zs6anyof64s5f4xaiqr6uol3hawq/';

  string public uriSuffix = '.json';

  string public hiddenMetadataUri;

  

  uint256 public cost;

  uint256 public price = 0 ether;

  uint256 public maxSupply = 500;

  uint256 public maxPerWallet  = 5;

  uint256 public totalFree =0;

  uint256 public maxMintAmountPerTx = 5;

  uint256 public maxPerFree = 0;

  uint256 public maxPerFreeWallet = 0;

  bool public paused = true;



  constructor() ERC721A("Spaceguinz", "SP") {

  }



  modifier mintCompliance(uint256 _mintAmount) {

    require(_mintAmount > 0 && _mintAmount <= maxMintAmountPerTx, 'Invalid mint amount!');

    require(totalSupply() + _mintAmount <= maxSupply, 'Max supply exceeded!');

    _;

  }



  modifier mintPriceCompliance(uint256 _mintAmount) {

    require(msg.value >= cost * _mintAmount, 'Insufficient funds!');

    _;

  }



  function mint(uint256 _mintAmount) public payable mintCompliance(_mintAmount) mintPriceCompliance(_mintAmount) {

      require(!paused);

    cost = price;

    if(totalSupply() + _mintAmount < totalFree + 1) {

      cost = 0;

      require(_mintAmount <= maxPerFree && cost == 0, "Too many Free mints!");

      require(numberMinted(msg.sender) + _mintAmount <= maxPerFreeWallet,"Free mint limit has been reached!");

    }

    require(numberMinted(msg.sender) + _mintAmount <= maxPerWallet,"Too many per wallet!");

    _safeMint(_msgSender(), _mintAmount);

  }



  function mintForAddress(uint256 _mintAmount, address _receiver) public mintCompliance(_mintAmount) onlyOwner {

    _safeMint(_receiver, _mintAmount);

  }



  function walletOfOwner(address _owner) public view returns (uint256[] memory) {

    uint256 ownerTokenCount = balanceOf(_owner);

    uint256[] memory ownedTokenIds = new uint256[](ownerTokenCount);

    uint256 currentTokenId = _startTokenId();

    uint256 ownedTokenIndex = 0;

    address latestOwnerAddress;



    while (ownedTokenIndex < ownerTokenCount && currentTokenId < _currentIndex) {

      TokenOwnership memory ownership = _ownerships[currentTokenId];



      if (!ownership.burned) {

        if (ownership.addr != address(0)) {

          latestOwnerAddress = ownership.addr;

        }



        if (latestOwnerAddress == _owner) {

          ownedTokenIds[ownedTokenIndex] = currentTokenId;



          ownedTokenIndex++;

        }

      }



      currentTokenId++;

    }

    return ownedTokenIds;

  }



  function _startTokenId() internal view virtual override returns (uint256) {

    return 1;

  }



  function numberMinted(address owner) public view returns (uint256) {

    return _numberMinted(owner);

  }

  

  function tokenURI(uint256 _tokenId) public view virtual override returns (string memory) {

    require(_exists(_tokenId), 'ERC721Metadata: URI query for nonexistent token');



    string memory currentBaseURI = _baseURI();

    return bytes(currentBaseURI).length > 0

        ? string(abi.encodePacked(currentBaseURI, _tokenId.toString(), uriSuffix))

        : '';

  }



  function pause(bool _state) public onlyOwner {

    paused = _state;

  }

  

  function setCost(uint256 _cost) public onlyOwner {

    price = _cost;

  }



  function setMaxPerFree(uint256 _maxPerFree) public onlyOwner {

    maxPerFree = _maxPerFree;

  }



  function setMaxPerWallet(uint256 _maxPerWallet) public onlyOwner {

    maxPerWallet = _maxPerWallet;

  }



  function setTotalFree(uint256 _totalFree) public onlyOwner {

    totalFree = _totalFree;

  }



  function setMaxPerFreeWallet(uint256 _maxPerFreeWallet) public onlyOwner {

    maxPerFreeWallet = _maxPerFreeWallet;

  }



  function setMaxMintAmountPerTx(uint256 _maxMintAmountPerTx) public onlyOwner {

    maxMintAmountPerTx = _maxMintAmountPerTx;

  }



  function setHiddenMetadataUri(string memory _hiddenMetadataUri) public onlyOwner {

    hiddenMetadataUri = _hiddenMetadataUri;

  }



  function setUriPrefix(string memory _uriPrefix) public onlyOwner {

    uriPrefix = _uriPrefix;

  }



  function setUriSuffix(string memory _uriSuffix) public onlyOwner {

    uriSuffix = _uriSuffix;

  }



  function withdraw() public onlyOwner nonReentrant {

    (bool os, ) = payable(owner()).call{value: address(this).balance}('');

    require(os);

  }



  function _baseURI() internal view virtual override returns (string memory) {

    return uriPrefix;

  }

}