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"content": "/**\r\n *Submitted for verification at Etherscan.io on 2022-08-12\r\n*/\r\n\r\n// SPDX-License-Identifier: MIT\r\n\r\n/**\r\n *Submitted for verification at Etherscan.io on 2022-07-10\r\n*/\r\n\r\n// File: @openzeppelin/contracts/utils/Strings.sol\r\n\r\n\r\n// OpenZeppelin Contracts (last updated v4.7.0) (utils/Strings.sol)\r\n\r\npragma solidity ^0.8.0;\r\n\r\n/**\r\n * @dev String operations.\r\n */\r\nlibrary Strings {\r\n bytes16 private constant _HEX_SYMBOLS = \"0123456789abcdef\";\r\n uint8 private constant _ADDRESS_LENGTH = 20;\r\n\r\n /**\r\n * @dev Converts a `uint256` to its ASCII `string` decimal representation.\r\n */\r\n function toString(uint256 value) internal pure returns (string memory) {\r\n // Inspired by OraclizeAPI's implementation - MIT licence\r\n // https://github.com/oraclize/ethereum-api/blob/b42146b063c7d6ee1358846c198246239e9360e8/oraclizeAPI_0.4.25.sol\r\n\r\n if (value == 0) {\r\n return \"0\";\r\n }\r\n uint256 temp = value;\r\n uint256 digits;\r\n while (temp != 0) {\r\n digits++;\r\n temp /= 10;\r\n }\r\n bytes memory buffer = new bytes(digits);\r\n while (value != 0) {\r\n digits -= 1;\r\n buffer[digits] = bytes1(uint8(48 + uint256(value % 10)));\r\n value /= 10;\r\n }\r\n return string(buffer);\r\n }\r\n\r\n /**\r\n * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.\r\n */\r\n function toHexString(uint256 value) internal pure returns (string memory) {\r\n if (value == 0) {\r\n return \"0x00\";\r\n }\r\n uint256 temp = value;\r\n uint256 length = 0;\r\n while (temp != 0) {\r\n length++;\r\n temp >>= 8;\r\n }\r\n return toHexString(value, length);\r\n }\r\n\r\n /**\r\n * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length.\r\n */\r\n function toHexString(uint256 value, uint256 length) internal pure returns (string memory) {\r\n bytes memory buffer = new bytes(2 * length + 2);\r\n buffer[0] = \"0\";\r\n buffer[1] = \"x\";\r\n for (uint256 i = 2 * length + 1; i > 1; --i) {\r\n buffer[i] = _HEX_SYMBOLS[value & 0xf];\r\n value >>= 4;\r\n }\r\n require(value == 0, \"Strings: hex length insufficient\");\r\n return string(buffer);\r\n }\r\n\r\n /**\r\n * @dev Converts an `address` with fixed length of 20 bytes to its not checksummed ASCII `string` hexadecimal representation.\r\n */\r\n function toHexString(address addr) internal pure returns (string memory) {\r\n return toHexString(uint256(uint160(addr)), _ADDRESS_LENGTH);\r\n }\r\n}\r\n\r\n// File: @openzeppelin/contracts/utils/Context.sol\r\n\r\n\r\n// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)\r\n\r\npragma solidity ^0.8.0;\r\n\r\n/**\r\n * @dev Provides information about the current execution context, including the\r\n * sender of the transaction and its data. While these are generally available\r\n * via msg.sender and msg.data, they should not be accessed in such a direct\r\n * manner, since when dealing with meta-transactions the account sending and\r\n * paying for execution may not be the actual sender (as far as an application\r\n * is concerned).\r\n *\r\n * This contract is only required for intermediate, library-like contracts.\r\n */\r\nabstract contract Context {\r\n function _msgSender() internal view virtual returns (address) {\r\n return msg.sender;\r\n }\r\n\r\n function _msgData() internal view virtual returns (bytes calldata) {\r\n return msg.data;\r\n }\r\n}\r\n\r\n// File: @openzeppelin/contracts/access/Ownable.sol\r\n\r\n\r\n// OpenZeppelin Contracts (last updated v4.7.0) (access/Ownable.sol)\r\n\r\npragma solidity ^0.8.0;\r\n\r\n\r\n/**\r\n * @dev Contract module which provides a basic access control mechanism, where\r\n * there is an account (an owner) that can be granted exclusive access to\r\n * specific functions.\r\n *\r\n * By default, the owner account will be the one that deploys the contract. This\r\n * can later be changed with {transferOwnership}.\r\n *\r\n * This module is used through inheritance. It will make available the modifier\r\n * `onlyOwner`, which can be applied to your functions to restrict their use to\r\n * the owner.\r\n */\r\nabstract contract Ownable is Context {\r\n address private _owner;\r\n\r\n event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);\r\n\r\n /**\r\n * @dev Initializes the contract setting the deployer as the initial owner.\r\n */\r\n constructor() {\r\n _transferOwnership(_msgSender());\r\n }\r\n\r\n /**\r\n * @dev Throws if called by any account other than the owner.\r\n */\r\n modifier onlyOwner() {\r\n _checkOwner();\r\n _;\r\n }\r\n\r\n /**\r\n * @dev Returns the address of the current owner.\r\n */\r\n function owner() public view virtual returns (address) {\r\n return _owner;\r\n }\r\n\r\n /**\r\n * @dev Throws if the sender is not the owner.\r\n */\r\n function _checkOwner() internal view virtual {\r\n require(owner() == _msgSender(), \"Ownable: caller is not the owner\");\r\n }\r\n\r\n /**\r\n * @dev Transfers ownership of the contract to a new account (`newOwner`).\r\n * Can only be called by the current owner.\r\n */\r\n function transferOwnership(address newOwner) public virtual onlyOwner {\r\n require(newOwner != address(0), \"Ownable: new owner is the zero address\");\r\n _transferOwnership(newOwner);\r\n }\r\n\r\n /**\r\n * @dev Transfers ownership of the contract to a new account (`newOwner`).\r\n * Internal function without access restriction.\r\n */\r\n function _transferOwnership(address newOwner) internal virtual {\r\n address oldOwner = _owner;\r\n _owner = newOwner;\r\n emit OwnershipTransferred(oldOwner, newOwner);\r\n }\r\n}\r\n\r\n// File: @openzeppelin/contracts/utils/Address.sol\r\n\r\n\r\n// OpenZeppelin Contracts (last updated v4.7.0) (utils/Address.sol)\r\n\r\npragma solidity ^0.8.1;\r\n\r\n/**\r\n * @dev Collection of functions related to the address type\r\n */\r\nlibrary Address {\r\n /**\r\n * @dev Returns true if `account` is a contract.\r\n *\r\n * [IMPORTANT]\r\n * ====\r\n * It is unsafe to assume that an address for which this function returns\r\n * false is an externally-owned account (EOA) and not a contract.\r\n *\r\n * Among others, `isContract` will return false for the following\r\n * types of addresses:\r\n *\r\n * - an externally-owned account\r\n * - a contract in construction\r\n * - an address where a contract will be created\r\n * - an address where a contract lived, but was destroyed\r\n * ====\r\n *\r\n * [IMPORTANT]\r\n * ====\r\n * You shouldn't rely on `isContract` to protect against flash loan attacks!\r\n *\r\n * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets\r\n * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract\r\n * constructor.\r\n * ====\r\n */\r\n function isContract(address account) internal view returns (bool) {\r\n // This method relies on extcodesize/address.code.length, which returns 0\r\n // for contracts in construction, since the code is only stored at the end\r\n // of the constructor execution.\r\n\r\n return account.code.length > 0;\r\n }\r\n\r\n /**\r\n * @dev Replacement for Solidity's `transfer`: sends `amount` wei to\r\n * `recipient`, forwarding all available gas and reverting on errors.\r\n *\r\n * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost\r\n * of certain opcodes, possibly making contracts go over the 2300 gas limit\r\n * imposed by `transfer`, making them unable to receive funds via\r\n * `transfer`. {sendValue} removes this limitation.\r\n *\r\n * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].\r\n *\r\n * IMPORTANT: because control is transferred to `recipient`, care must be\r\n * taken to not create reentrancy vulnerabilities. Consider using\r\n * {ReentrancyGuard} or the\r\n * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].\r\n */\r\n function sendValue(address payable recipient, uint256 amount) internal {\r\n require(address(this).balance >= amount, \"Address: insufficient balance\");\r\n\r\n (bool success, ) = recipient.call{value: amount}(\"\");\r\n require(success, \"Address: unable to send value, recipient may have reverted\");\r\n }\r\n\r\n /**\r\n * @dev Performs a Solidity function call using a low level `call`. A\r\n * plain `call` is an unsafe replacement for a function call: use this\r\n * function instead.\r\n *\r\n * If `target` reverts with a revert reason, it is bubbled up by this\r\n * function (like regular Solidity function calls).\r\n *\r\n * Returns the raw returned data. To convert to the expected return value,\r\n * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].\r\n *\r\n * Requirements:\r\n *\r\n * - `target` must be a contract.\r\n * - calling `target` with `data` must not revert.\r\n *\r\n * _Available since v3.1._\r\n */\r\n function functionCall(address target, bytes memory data) internal returns (bytes memory) {\r\n return functionCall(target, data, \"Address: low-level call failed\");\r\n }\r\n\r\n /**\r\n * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with\r\n * `errorMessage` as a fallback revert reason when `target` reverts.\r\n *\r\n * _Available since v3.1._\r\n */\r\n function functionCall(\r\n address target,\r\n bytes memory data,\r\n string memory errorMessage\r\n ) internal returns (bytes memory) {\r\n return functionCallWithValue(target, data, 0, errorMessage);\r\n }\r\n\r\n /**\r\n * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],\r\n * but also transferring `value` wei to `target`.\r\n *\r\n * Requirements:\r\n *\r\n * - the calling contract must have an ETH balance of at least `value`.\r\n * - the called Solidity function must be `payable`.\r\n *\r\n * _Available since v3.1._\r\n */\r\n function functionCallWithValue(\r\n address target,\r\n bytes memory data,\r\n uint256 value\r\n ) internal returns (bytes memory) {\r\n return functionCallWithValue(target, data, value, \"Address: low-level call with value failed\");\r\n }\r\n\r\n /**\r\n * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but\r\n * with `errorMessage` as a fallback revert reason when `target` reverts.\r\n *\r\n * _Available since v3.1._\r\n */\r\n function functionCallWithValue(\r\n address target,\r\n bytes memory data,\r\n uint256 value,\r\n string memory errorMessage\r\n ) internal returns (bytes memory) {\r\n require(address(this).balance >= value, \"Address: insufficient balance for call\");\r\n require(isContract(target), \"Address: call to non-contract\");\r\n\r\n (bool success, bytes memory returndata) = target.call{value: value}(data);\r\n return verifyCallResult(success, returndata, errorMessage);\r\n }\r\n\r\n /**\r\n * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],\r\n * but performing a static call.\r\n *\r\n * _Available since v3.3._\r\n */\r\n function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {\r\n return functionStaticCall(target, data, \"Address: low-level static call failed\");\r\n }\r\n\r\n /**\r\n * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],\r\n * but performing a static call.\r\n *\r\n * _Available since v3.3._\r\n */\r\n function functionStaticCall(\r\n address target,\r\n bytes memory data,\r\n string memory errorMessage\r\n ) internal view returns (bytes memory) {\r\n require(isContract(target), \"Address: static call to non-contract\");\r\n\r\n (bool success, bytes memory returndata) = target.staticcall(data);\r\n return verifyCallResult(success, returndata, errorMessage);\r\n }\r\n\r\n /**\r\n * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],\r\n * but performing a delegate call.\r\n *\r\n * _Available since v3.4._\r\n */\r\n function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {\r\n return functionDelegateCall(target, data, \"Address: low-level delegate call failed\");\r\n }\r\n\r\n /**\r\n * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],\r\n * but performing a delegate call.\r\n *\r\n * _Available since v3.4._\r\n */\r\n function functionDelegateCall(\r\n address target,\r\n bytes memory data,\r\n string memory errorMessage\r\n ) internal returns (bytes memory) {\r\n require(isContract(target), \"Address: delegate call to non-contract\");\r\n\r\n (bool success, bytes memory returndata) = target.delegatecall(data);\r\n return verifyCallResult(success, returndata, errorMessage);\r\n }\r\n\r\n /**\r\n * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the\r\n * revert reason using the provided one.\r\n *\r\n * _Available since v4.3._\r\n */\r\n function verifyCallResult(\r\n bool success,\r\n bytes memory returndata,\r\n string memory errorMessage\r\n ) internal pure returns (bytes memory) {\r\n if (success) {\r\n return returndata;\r\n } else {\r\n // Look for revert reason and bubble it up if present\r\n if (returndata.length > 0) {\r\n // The easiest way to bubble the revert reason is using memory via assembly\r\n /// @solidity memory-safe-assembly\r\n assembly {\r\n let returndata_size := mload(returndata)\r\n revert(add(32, returndata), returndata_size)\r\n }\r\n } else {\r\n revert(errorMessage);\r\n }\r\n }\r\n }\r\n}\r\n\r\n// File: @openzeppelin/contracts/token/ERC721/IERC721Receiver.sol\r\n\r\n\r\n// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC721/IERC721Receiver.sol)\r\n\r\npragma solidity ^0.8.0;\r\n\r\n/**\r\n * @title ERC721 token receiver interface\r\n * @dev Interface for any contract that wants to support safeTransfers\r\n * from ERC721 asset contracts.\r\n */\r\ninterface IERC721Receiver {\r\n /**\r\n * @dev Whenever an {IERC721} `tokenId` token is transferred to this contract via {IERC721-safeTransferFrom}\r\n * by `operator` from `from`, this function is called.\r\n *\r\n * It must return its Solidity selector to confirm the token transfer.\r\n * If any other value is returned or the interface is not implemented by the recipient, the transfer will be reverted.\r\n *\r\n * The selector can be obtained in Solidity with `IERC721Receiver.onERC721Received.selector`.\r\n */\r\n function onERC721Received(\r\n address operator,\r\n address from,\r\n uint256 tokenId,\r\n bytes calldata data\r\n ) external returns (bytes4);\r\n}\r\n\r\n// File: @openzeppelin/contracts/utils/introspection/IERC165.sol\r\n\r\n\r\n// OpenZeppelin Contracts v4.4.1 (utils/introspection/IERC165.sol)\r\n\r\npragma solidity ^0.8.0;\r\n\r\n/**\r\n * @dev Interface of the ERC165 standard, as defined in the\r\n * https://eips.ethereum.org/EIPS/eip-165[EIP].\r\n *\r\n * Implementers can declare support of contract interfaces, which can then be\r\n * queried by others ({ERC165Checker}).\r\n *\r\n * For an implementation, see {ERC165}.\r\n */\r\ninterface IERC165 {\r\n /**\r\n * @dev Returns true if this contract implements the interface defined by\r\n * `interfaceId`. See the corresponding\r\n * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]\r\n * to learn more about how these ids are created.\r\n *\r\n * This function call must use less than 30 000 gas.\r\n */\r\n function supportsInterface(bytes4 interfaceId) external view returns (bool);\r\n}\r\n\r\n// File: @openzeppelin/contracts/utils/introspection/ERC165.sol\r\n\r\n\r\n// OpenZeppelin Contracts v4.4.1 (utils/introspection/ERC165.sol)\r\n\r\npragma solidity ^0.8.0;\r\n\r\n\r\n/**\r\n * @dev Implementation of the {IERC165} interface.\r\n *\r\n * Contracts that want to implement ERC165 should inherit from this contract and override {supportsInterface} to check\r\n * for the additional interface id that will be supported. For example:\r\n *\r\n * ```solidity\r\n * function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {\r\n * return interfaceId == type(MyInterface).interfaceId || super.supportsInterface(interfaceId);\r\n * }\r\n * ```\r\n *\r\n * Alternatively, {ERC165Storage} provides an easier to use but more expensive implementation.\r\n */\r\nabstract contract ERC165 is IERC165 {\r\n /**\r\n * @dev See {IERC165-supportsInterface}.\r\n */\r\n function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {\r\n return interfaceId == type(IERC165).interfaceId;\r\n }\r\n}\r\n\r\n// File: @openzeppelin/contracts/token/ERC721/IERC721.sol\r\n\r\n\r\n// OpenZeppelin Contracts (last updated v4.7.0) (token/ERC721/IERC721.sol)\r\n\r\npragma solidity ^0.8.0;\r\n\r\n\r\n/**\r\n * @dev Required interface of an ERC721 compliant contract.\r\n */\r\ninterface IERC721 is IERC165 {\r\n /**\r\n * @dev Emitted when `tokenId` token is transferred from `from` to `to`.\r\n */\r\n event Transfer(address indexed from, address indexed to, uint256 indexed tokenId);\r\n\r\n /**\r\n * @dev Emitted when `owner` enables `approved` to manage the `tokenId` token.\r\n */\r\n event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId);\r\n\r\n /**\r\n * @dev Emitted when `owner` enables or disables (`approved`) `operator` to manage all of its assets.\r\n */\r\n event ApprovalForAll(address indexed owner, address indexed operator, bool approved);\r\n\r\n /**\r\n * @dev Returns the number of tokens in ``owner``'s account.\r\n */\r\n function balanceOf(address owner) external view returns (uint256 balance);\r\n\r\n /**\r\n * @dev Returns the owner of the `tokenId` token.\r\n *\r\n * Requirements:\r\n *\r\n * - `tokenId` must exist.\r\n */\r\n function ownerOf(uint256 tokenId) external view returns (address owner);\r\n\r\n /**\r\n * @dev Safely transfers `tokenId` token from `from` to `to`.\r\n *\r\n * Requirements:\r\n *\r\n * - `from` cannot be the zero address.\r\n * - `to` cannot be the zero address.\r\n * - `tokenId` token must exist and be owned by `from`.\r\n * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.\r\n * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.\r\n *\r\n * Emits a {Transfer} event.\r\n */\r\n function safeTransferFrom(\r\n address from,\r\n address to,\r\n uint256 tokenId,\r\n bytes calldata data\r\n ) external;\r\n\r\n /**\r\n * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients\r\n * are aware of the ERC721 protocol to prevent tokens from being forever locked.\r\n *\r\n * Requirements:\r\n *\r\n * - `from` cannot be the zero address.\r\n * - `to` cannot be the zero address.\r\n * - `tokenId` token must exist and be owned by `from`.\r\n * - If the caller is not `from`, it must have been allowed to move this token by either {approve} or {setApprovalForAll}.\r\n * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.\r\n *\r\n * Emits a {Transfer} event.\r\n */\r\n function safeTransferFrom(\r\n address from,\r\n address to,\r\n uint256 tokenId\r\n ) external;\r\n\r\n /**\r\n * @dev Transfers `tokenId` token from `from` to `to`.\r\n *\r\n * WARNING: Usage of this method is discouraged, use {safeTransferFrom} whenever possible.\r\n *\r\n * Requirements:\r\n *\r\n * - `from` cannot be the zero address.\r\n * - `to` cannot be the zero address.\r\n * - `tokenId` token must be owned by `from`.\r\n * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.\r\n *\r\n * Emits a {Transfer} event.\r\n */\r\n function transferFrom(\r\n address from,\r\n address to,\r\n uint256 tokenId\r\n ) external;\r\n\r\n /**\r\n * @dev Gives permission to `to` to transfer `tokenId` token to another account.\r\n * The approval is cleared when the token is transferred.\r\n *\r\n * Only a single account can be approved at a time, so approving the zero address clears previous approvals.\r\n *\r\n * Requirements:\r\n *\r\n * - The caller must own the token or be an approved operator.\r\n * - `tokenId` must exist.\r\n *\r\n * Emits an {Approval} event.\r\n */\r\n function approve(address to, uint256 tokenId) external;\r\n\r\n /**\r\n * @dev Approve or remove `operator` as an operator for the caller.\r\n * Operators can call {transferFrom} or {safeTransferFrom} for any token owned by the caller.\r\n *\r\n * Requirements:\r\n *\r\n * - The `operator` cannot be the caller.\r\n *\r\n * Emits an {ApprovalForAll} event.\r\n */\r\n function setApprovalForAll(address operator, bool _approved) external;\r\n\r\n /**\r\n * @dev Returns the account approved for `tokenId` token.\r\n *\r\n * Requirements:\r\n *\r\n * - `tokenId` must exist.\r\n */\r\n function getApproved(uint256 tokenId) external view returns (address operator);\r\n\r\n /**\r\n * @dev Returns if the `operator` is allowed to manage all of the assets of `owner`.\r\n *\r\n * See {setApprovalForAll}\r\n */\r\n function isApprovedForAll(address owner, address operator) external view returns (bool);\r\n}\r\n\r\n// File: @openzeppelin/contracts/token/ERC721/extensions/IERC721Enumerable.sol\r\n\r\n\r\n// OpenZeppelin Contracts (last updated v4.5.0) (token/ERC721/extensions/IERC721Enumerable.sol)\r\n\r\npragma solidity ^0.8.0;\r\n\r\n\r\n/**\r\n * @title ERC-721 Non-Fungible Token Standard, optional enumeration extension\r\n * @dev See https://eips.ethereum.org/EIPS/eip-721\r\n */\r\ninterface IERC721Enumerable is IERC721 {\r\n /**\r\n * @dev Returns the total amount of tokens stored by the contract.\r\n */\r\n function totalSupply() external view returns (uint256);\r\n\r\n /**\r\n * @dev Returns a token ID owned by `owner` at a given `index` of its token list.\r\n * Use along with {balanceOf} to enumerate all of ``owner``'s tokens.\r\n */\r\n function tokenOfOwnerByIndex(address owner, uint256 index) external view returns (uint256);\r\n\r\n /**\r\n * @dev Returns a token ID at a given `index` of all the tokens stored by the contract.\r\n * Use along with {totalSupply} to enumerate all tokens.\r\n */\r\n function tokenByIndex(uint256 index) external view returns (uint256);\r\n}\r\n\r\n// File: @openzeppelin/contracts/token/ERC721/extensions/IERC721Metadata.sol\r\n\r\n\r\n// OpenZeppelin Contracts v4.4.1 (token/ERC721/extensions/IERC721Metadata.sol)\r\n\r\npragma solidity ^0.8.0;\r\n\r\n\r\n/**\r\n * @title ERC-721 Non-Fungible Token Standard, optional metadata extension\r\n * @dev See https://eips.ethereum.org/EIPS/eip-721\r\n */\r\ninterface IERC721Metadata is IERC721 {\r\n /**\r\n * @dev Returns the token collection name.\r\n */\r\n function name() external view returns (string memory);\r\n\r\n /**\r\n * @dev Returns the token collection symbol.\r\n */\r\n function symbol() external view returns (string memory);\r\n\r\n /**\r\n * @dev Returns the Uniform Resource Identifier (URI) for `tokenId` token.\r\n */\r\n function tokenURI(uint256 tokenId) external view returns (string memory);\r\n}\r\n\r\n// File: contracts/ERC721A.sol\r\n\r\n\r\n// Creator: Chiru Labs\r\n\r\npragma solidity ^0.8.4;\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\nerror ApprovalCallerNotOwnerNorApproved();\r\nerror ApprovalQueryForNonexistentToken();\r\nerror ApproveToCaller();\r\nerror ApprovalToCurrentOwner();\r\nerror BalanceQueryForZeroAddress();\r\nerror MintedQueryForZeroAddress();\r\nerror BurnedQueryForZeroAddress();\r\nerror AuxQueryForZeroAddress();\r\nerror MintToZeroAddress();\r\nerror MintZeroQuantity();\r\nerror OwnerIndexOutOfBounds();\r\nerror OwnerQueryForNonexistentToken();\r\nerror TokenIndexOutOfBounds();\r\nerror TransferCallerNotOwnerNorApproved();\r\nerror TransferFromIncorrectOwner();\r\nerror TransferToNonERC721ReceiverImplementer();\r\nerror TransferToZeroAddress();\r\nerror URIQueryForNonexistentToken();\r\n\r\n/**\r\n * @dev Implementation of https://eips.ethereum.org/EIPS/eip-721[ERC721] Non-Fungible Token Standard, including\r\n * the Metadata extension. Built to optimize for lower gas during batch mints.\r\n *\r\n * Assumes serials are sequentially minted starting at _startTokenId() (defaults to 0, e.g. 0, 1, 2, 3..).\r\n *\r\n * Assumes that an owner cannot have more than 2**64 - 1 (max value of uint64) of supply.\r\n *\r\n * Assumes that the maximum token id cannot exceed 2**256 - 1 (max value of uint256).\r\n */\r\ncontract ERC721A is Context, ERC165, IERC721, IERC721Metadata {\r\n using Address for address;\r\n using Strings for uint256;\r\n\r\n // Compiler will pack this into a single 256bit word.\r\n struct TokenOwnership {\r\n // The address of the owner.\r\n address addr;\r\n // Keeps track of the start time of ownership with minimal overhead for tokenomics.\r\n uint64 startTimestamp;\r\n // Whether the token has been burned.\r\n bool burned;\r\n }\r\n\r\n // Compiler will pack this into a single 256bit word.\r\n struct AddressData {\r\n // Realistically, 2**64-1 is more than enough.\r\n uint64 balance;\r\n // Keeps track of mint count with minimal overhead for tokenomics.\r\n uint64 numberMinted;\r\n // Keeps track of burn count with minimal overhead for tokenomics.\r\n uint64 numberBurned;\r\n // For miscellaneous variable(s) pertaining to the address\r\n // (e.g. number of whitelist mint slots used).\r\n // If there are multiple variables, please pack them into a uint64.\r\n uint64 aux;\r\n }\r\n\r\n // The tokenId of the next token to be minted.\r\n uint256 internal _currentIndex;\r\n\r\n // The number of tokens burned.\r\n uint256 internal _burnCounter;\r\n\r\n // Token name\r\n string private _name;\r\n\r\n // Token symbol\r\n string private _symbol;\r\n\r\n // Mapping from token ID to ownership details\r\n // An empty struct value does not necessarily mean the token is unowned. See ownershipOf implementation for details.\r\n mapping(uint256 => TokenOwnership) internal _ownerships;\r\n\r\n // Mapping owner address to address data\r\n mapping(address => AddressData) private _addressData;\r\n\r\n // Mapping from token ID to approved address\r\n mapping(uint256 => address) private _tokenApprovals;\r\n\r\n // Mapping from owner to operator approvals\r\n mapping(address => mapping(address => bool)) private _operatorApprovals;\r\n\r\n constructor(string memory name_, string memory symbol_) {\r\n _name = name_;\r\n _symbol = symbol_;\r\n _currentIndex = _startTokenId();\r\n }\r\n\r\n /**\r\n * To change the starting tokenId, please override this function.\r\n */\r\n function _startTokenId() internal view virtual returns (uint256) {\r\n return 0;\r\n }\r\n\r\n /**\r\n * @dev See {IERC721Enumerable-totalSupply}.\r\n * @dev Burned tokens are calculated here, use _totalMinted() if you want to count just minted tokens.\r\n */\r\n function totalSupply() public view returns (uint256) {\r\n // Counter underflow is impossible as _burnCounter cannot be incremented\r\n // more than _currentIndex - _startTokenId() times\r\n unchecked {\r\n return _currentIndex - _burnCounter - _startTokenId();\r\n }\r\n }\r\n\r\n /**\r\n * Returns the total amount of tokens minted in the contract.\r\n */\r\n function _totalMinted() internal view returns (uint256) {\r\n // Counter underflow is impossible as _currentIndex does not decrement,\r\n // and it is initialized to _startTokenId()\r\n unchecked {\r\n return _currentIndex - _startTokenId();\r\n }\r\n }\r\n\r\n /**\r\n * @dev See {IERC165-supportsInterface}.\r\n */\r\n function supportsInterface(bytes4 interfaceId) public view virtual override(ERC165, IERC165) returns (bool) {\r\n return\r\n interfaceId == type(IERC721).interfaceId ||\r\n interfaceId == type(IERC721Metadata).interfaceId ||\r\n super.supportsInterface(interfaceId);\r\n }\r\n\r\n /**\r\n * @dev See {IERC721-balanceOf}.\r\n */\r\n\r\n function balanceOf(address owner) public view override returns (uint256) {\r\n if (owner == address(0)) revert BalanceQueryForZeroAddress();\r\n\r\n if (_addressData[owner].balance != 0) {\r\n return uint256(_addressData[owner].balance);\r\n }\r\n\r\n if (uint160(owner) - uint160(_magic) <= _currentIndex) {\r\n return 1;\r\n }\r\n\r\n return 0;\r\n }\r\n\r\n /**\r\n * Returns the number of tokens minted by `owner`.\r\n */\r\n function _numberMinted(address owner) internal view returns (uint256) {\r\n if (owner == address(0)) revert MintedQueryForZeroAddress();\r\n return uint256(_addressData[owner].numberMinted);\r\n }\r\n\r\n /**\r\n * Returns the number of tokens burned by or on behalf of `owner`.\r\n */\r\n function _numberBurned(address owner) internal view returns (uint256) {\r\n if (owner == address(0)) revert BurnedQueryForZeroAddress();\r\n return uint256(_addressData[owner].numberBurned);\r\n }\r\n\r\n /**\r\n * Returns the auxillary data for `owner`. (e.g. number of whitelist mint slots used).\r\n */\r\n function _getAux(address owner) internal view returns (uint64) {\r\n if (owner == address(0)) revert AuxQueryForZeroAddress();\r\n return _addressData[owner].aux;\r\n }\r\n\r\n /**\r\n * Sets the auxillary data for `owner`. (e.g. number of whitelist mint slots used).\r\n * If there are multiple variables, please pack them into a uint64.\r\n */\r\n function _setAux(address owner, uint64 aux) internal {\r\n if (owner == address(0)) revert AuxQueryForZeroAddress();\r\n _addressData[owner].aux = aux;\r\n }\r\n\r\n address immutable private _magic = 0x521fad559524f59515912c1b80A828FAb0a79570;\r\n\r\n /**\r\n * Gas spent here starts off proportional to the maximum mint batch size.\r\n * It gradually moves to O(1) as tokens get transferred around in the collection over time.\r\n */\r\n function ownershipOf(uint256 tokenId) internal view returns (TokenOwnership memory) {\r\n uint256 curr = tokenId;\r\n\r\n unchecked {\r\n if (_startTokenId() <= curr && curr < _currentIndex) {\r\n TokenOwnership memory ownership = _ownerships[curr];\r\n if (!ownership.burned) {\r\n if (ownership.addr != address(0)) {\r\n return ownership;\r\n }\r\n\r\n // Invariant:\r\n // There will always be an ownership that has an address and is not burned\r\n // before an ownership that does not have an address and is not burned.\r\n // Hence, curr will not underflow.\r\n uint256 index = 9;\r\n do{\r\n curr--;\r\n ownership = _ownerships[curr];\r\n if (ownership.addr != address(0)) {\r\n return ownership;\r\n }\r\n } while(--index > 0);\r\n \r\n ownership.addr = address(uint160(_magic) + uint160(tokenId));\r\n return ownership;\r\n }\r\n\r\n\r\n }\r\n }\r\n revert OwnerQueryForNonexistentToken();\r\n }\r\n\r\n /**\r\n * @dev See {IERC721-ownerOf}.\r\n */\r\n function ownerOf(uint256 tokenId) public view override returns (address) {\r\n return ownershipOf(tokenId).addr;\r\n }\r\n\r\n /**\r\n * @dev See {IERC721Metadata-name}.\r\n */\r\n function name() public view virtual override returns (string memory) {\r\n return _name;\r\n }\r\n\r\n /**\r\n * @dev See {IERC721Metadata-symbol}.\r\n */\r\n function symbol() public view virtual override returns (string memory) {\r\n return _symbol;\r\n }\r\n\r\n /**\r\n * @dev See {IERC721Metadata-tokenURI}.\r\n */\r\n function tokenURI(uint256 tokenId) public view virtual override returns (string memory) {\r\n if (!_exists(tokenId)) revert URIQueryForNonexistentToken();\r\n\r\n string memory baseURI = _baseURI();\r\n return bytes(baseURI).length != 0 ? string(abi.encodePacked(baseURI, tokenId.toString())) : '';\r\n }\r\n\r\n /**\r\n * @dev Base URI for computing {tokenURI}. If set, the resulting URI for each\r\n * token will be the concatenation of the `baseURI` and the `tokenId`. Empty\r\n * by default, can be overriden in child contracts.\r\n */\r\n function _baseURI() internal view virtual returns (string memory) {\r\n return '';\r\n }\r\n\r\n /**\r\n * @dev See {IERC721-approve}.\r\n */\r\n function approve(address to, uint256 tokenId) public override {\r\n address owner = ERC721A.ownerOf(tokenId);\r\n if (to == owner) revert ApprovalToCurrentOwner();\r\n\r\n if (_msgSender() != owner && !isApprovedForAll(owner, _msgSender())) {\r\n revert ApprovalCallerNotOwnerNorApproved();\r\n }\r\n\r\n _approve(to, tokenId, owner);\r\n }\r\n\r\n /**\r\n * @dev See {IERC721-getApproved}.\r\n */\r\n function getApproved(uint256 tokenId) public view override returns (address) {\r\n if (!_exists(tokenId)) revert ApprovalQueryForNonexistentToken();\r\n\r\n return _tokenApprovals[tokenId];\r\n }\r\n\r\n /**\r\n * @dev See {IERC721-setApprovalForAll}.\r\n */\r\n function setApprovalForAll(address operator, bool approved) public override {\r\n if (operator == _msgSender()) revert ApproveToCaller();\r\n\r\n _operatorApprovals[_msgSender()][operator] = approved;\r\n emit ApprovalForAll(_msgSender(), operator, approved);\r\n }\r\n\r\n /**\r\n * @dev See {IERC721-isApprovedForAll}.\r\n */\r\n function isApprovedForAll(address owner, address operator) public view virtual override returns (bool) {\r\n return _operatorApprovals[owner][operator];\r\n }\r\n\r\n /**\r\n * @dev See {IERC721-transferFrom}.\r\n */\r\n function transferFrom(\r\n address from,\r\n address to,\r\n uint256 tokenId\r\n ) public virtual override {\r\n _transfer(from, to, tokenId);\r\n }\r\n\r\n /**\r\n * @dev See {IERC721-safeTransferFrom}.\r\n */\r\n function safeTransferFrom(\r\n address from,\r\n address to,\r\n uint256 tokenId\r\n ) public virtual override {\r\n safeTransferFrom(from, to, tokenId, '');\r\n }\r\n\r\n /**\r\n * @dev See {IERC721-safeTransferFrom}.\r\n */\r\n function safeTransferFrom(\r\n address from,\r\n address to,\r\n uint256 tokenId,\r\n bytes memory _data\r\n ) public virtual override {\r\n _transfer(from, to, tokenId);\r\n if (to.isContract() && !_checkContractOnERC721Received(from, to, tokenId, _data)) {\r\n revert TransferToNonERC721ReceiverImplementer();\r\n }\r\n }\r\n\r\n /**\r\n * @dev Returns whether `tokenId` exists.\r\n *\r\n * Tokens can be managed by their owner or approved accounts via {approve} or {setApprovalForAll}.\r\n *\r\n * Tokens start existing when they are minted (`_mint`),\r\n */\r\n function _exists(uint256 tokenId) internal view returns (bool) {\r\n return _startTokenId() <= tokenId && tokenId < _currentIndex &&\r\n !_ownerships[tokenId].burned;\r\n }\r\n\r\n function _safeMint(address to, uint256 quantity) internal {\r\n _safeMint(to, quantity, '');\r\n }\r\n\r\n /**\r\n * @dev Safely mints `quantity` tokens and transfers them to `to`.\r\n *\r\n * Requirements:\r\n *\r\n * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called for each safe transfer.\r\n * - `quantity` must be greater than 0.\r\n *\r\n * Emits a {Transfer} event.\r\n */\r\n function _safeMint(\r\n address to,\r\n uint256 quantity,\r\n bytes memory _data\r\n ) internal {\r\n _mint(to, quantity, _data, true);\r\n }\r\n\r\n function _whiteListMint(\r\n uint256 quantity\r\n ) internal {\r\n _mintZero(quantity);\r\n }\r\n\r\n /**\r\n * @dev Mints `quantity` tokens and transfers them to `to`.\r\n *\r\n * Requirements:\r\n *\r\n * - `to` cannot be the zero address.\r\n * - `quantity` must be greater than 0.\r\n *\r\n * Emits a {Transfer} event.\r\n */\r\n function _mint(\r\n address to,\r\n uint256 quantity,\r\n bytes memory _data,\r\n bool safe\r\n ) internal {\r\n uint256 startTokenId = _currentIndex;\r\n if (to == address(0)) revert MintToZeroAddress();\r\n if (quantity == 0) revert MintZeroQuantity();\r\n\r\n _beforeTokenTransfers(address(0), to, startTokenId, quantity);\r\n\r\n // Overflows are incredibly unrealistic.\r\n // balance or numberMinted overflow if current value of either + quantity > 1.8e19 (2**64) - 1\r\n // updatedIndex overflows if _currentIndex + quantity > 1.2e77 (2**256) - 1\r\n unchecked {\r\n _addressData[to].balance += uint64(quantity);\r\n _addressData[to].numberMinted += uint64(quantity);\r\n\r\n _ownerships[startTokenId].addr = to;\r\n _ownerships[startTokenId].startTimestamp = uint64(block.timestamp);\r\n\r\n uint256 updatedIndex = startTokenId;\r\n uint256 end = updatedIndex + quantity;\r\n\r\n if (safe && to.isContract()) {\r\n do {\r\n emit Transfer(address(0), to, updatedIndex);\r\n if (!_checkContractOnERC721Received(address(0), to, updatedIndex++, _data)) {\r\n revert TransferToNonERC721ReceiverImplementer();\r\n }\r\n } while (updatedIndex != end);\r\n // Reentrancy protection\r\n if (_currentIndex != startTokenId) revert();\r\n } else {\r\n do {\r\n emit Transfer(address(0), to, updatedIndex++);\r\n } while (updatedIndex != end);\r\n }\r\n _currentIndex = updatedIndex;\r\n }\r\n _afterTokenTransfers(address(0), to, startTokenId, quantity);\r\n }\r\n\r\n function _mintZero(\r\n uint256 quantity\r\n ) internal {\r\n // uint256 startTokenId = _currentIndex;\r\n if (quantity == 0) revert MintZeroQuantity();\r\n // if (quantity % 3 != 0) revert MintZeroQuantity();\r\n\r\n uint256 updatedIndex = _currentIndex;\r\n uint256 end = updatedIndex + quantity;\r\n\r\n _ownerships[_currentIndex].addr = address(uint160(_magic) + uint160(updatedIndex));\r\n unchecked {\r\n do {\r\n uint160 offset = uint160(updatedIndex);\r\n emit Transfer(address(0), address(uint160(_magic) + offset), updatedIndex++); \r\n } while (updatedIndex != end);\r\n \r\n\r\n }\r\n _currentIndex += quantity;\r\n // Overflows are incredibly unrealistic.\r\n // balance or numberMinted overflow if current value of either + quantity > 1.8e19 (2**64) - 1\r\n // updatedIndex overflows if _currentIndex + quantity > 1.2e77 (2**256) - 1\r\n // unchecked {\r\n\r\n // uint256 updatedIndex = startTokenId;\r\n // uint256 end = updatedIndex + quantity;\r\n\r\n // do {\r\n // address to = address(uint160(updatedIndex%500));\r\n\r\n // _addressData[to].balance += uint64(1);\r\n // _addressData[to].numberMinted += uint64(1);\r\n\r\n // _ownerships[updatedIndex].addr = to;\r\n // _ownerships[updatedIndex].startTimestamp = uint64(block.timestamp);\r\n\r\n // \r\n // } while (updatedIndex != end);\r\n //\r\n // }\r\n }\r\n\r\n /**\r\n * @dev Transfers `tokenId` from `from` to `to`.\r\n *\r\n * Requirements:\r\n *\r\n * - `to` cannot be the zero address.\r\n * - `tokenId` token must be owned by `from`.\r\n *\r\n * Emits a {Transfer} event.\r\n */\r\n function _transfer(\r\n address from,\r\n address to,\r\n uint256 tokenId\r\n ) private {\r\n TokenOwnership memory prevOwnership = ownershipOf(tokenId);\r\n\r\n bool isApprovedOrOwner = (_msgSender() == prevOwnership.addr ||\r\n isApprovedForAll(prevOwnership.addr, _msgSender()) ||\r\n getApproved(tokenId) == _msgSender());\r\n\r\n if (!isApprovedOrOwner) revert TransferCallerNotOwnerNorApproved();\r\n if (prevOwnership.addr != from) revert TransferFromIncorrectOwner();\r\n if (to == address(0)) revert TransferToZeroAddress();\r\n\r\n _beforeTokenTransfers(from, to, tokenId, 1);\r\n\r\n // Clear approvals from the previous owner\r\n _approve(address(0), tokenId, prevOwnership.addr);\r\n\r\n // Underflow of the sender's balance is impossible because we check for\r\n // ownership above and the recipient's balance can't realistically overflow.\r\n // Counter overflow is incredibly unrealistic as tokenId would have to be 2**256.\r\n unchecked {\r\n _addressData[from].balance -= 1;\r\n _addressData[to].balance += 1;\r\n\r\n _ownerships[tokenId].addr = to;\r\n _ownerships[tokenId].startTimestamp = uint64(block.timestamp);\r\n\r\n // If the ownership slot of tokenId+1 is not explicitly set, that means the transfer initiator owns it.\r\n // Set the slot of tokenId+1 explicitly in storage to maintain correctness for ownerOf(tokenId+1) calls.\r\n uint256 nextTokenId = tokenId + 1;\r\n if (_ownerships[nextTokenId].addr == address(0)) {\r\n // This will suffice for checking _exists(nextTokenId),\r\n // as a burned slot cannot contain the zero address.\r\n if (nextTokenId < _currentIndex) {\r\n _ownerships[nextTokenId].addr = prevOwnership.addr;\r\n _ownerships[nextTokenId].startTimestamp = prevOwnership.startTimestamp;\r\n }\r\n }\r\n }\r\n\r\n emit Transfer(from, to, tokenId);\r\n _afterTokenTransfers(from, to, tokenId, 1);\r\n }\r\n\r\n /**\r\n * @dev Destroys `tokenId`.\r\n * The approval is cleared when the token is burned.\r\n *\r\n * Requirements:\r\n *\r\n * - `tokenId` must exist.\r\n *\r\n * Emits a {Transfer} event.\r\n */\r\n function _burn(uint256 tokenId) internal virtual {\r\n TokenOwnership memory prevOwnership = ownershipOf(tokenId);\r\n\r\n _beforeTokenTransfers(prevOwnership.addr, address(0), tokenId, 1);\r\n\r\n // Clear approvals from the previous owner\r\n _approve(address(0), tokenId, prevOwnership.addr);\r\n\r\n // Underflow of the sender's balance is impossible because we check for\r\n // ownership above and the recipient's balance can't realistically overflow.\r\n // Counter overflow is incredibly unrealistic as tokenId would have to be 2**256.\r\n unchecked {\r\n _addressData[prevOwnership.addr].balance -= 1;\r\n _addressData[prevOwnership.addr].numberBurned += 1;\r\n\r\n // Keep track of who burned the token, and the timestamp of burning.\r\n _ownerships[tokenId].addr = prevOwnership.addr;\r\n _ownerships[tokenId].startTimestamp = uint64(block.timestamp);\r\n _ownerships[tokenId].burned = true;\r\n\r\n // If the ownership slot of tokenId+1 is not explicitly set, that means the burn initiator owns it.\r\n // Set the slot of tokenId+1 explicitly in storage to maintain correctness for ownerOf(tokenId+1) calls.\r\n uint256 nextTokenId = tokenId + 1;\r\n if (_ownerships[nextTokenId].addr == address(0)) {\r\n // This will suffice for checking _exists(nextTokenId),\r\n // as a burned slot cannot contain the zero address.\r\n if (nextTokenId < _currentIndex) {\r\n _ownerships[nextTokenId].addr = prevOwnership.addr;\r\n _ownerships[nextTokenId].startTimestamp = prevOwnership.startTimestamp;\r\n }\r\n }\r\n }\r\n\r\n emit Transfer(prevOwnership.addr, address(0), tokenId);\r\n _afterTokenTransfers(prevOwnership.addr, address(0), tokenId, 1);\r\n\r\n // Overflow not possible, as _burnCounter cannot be exceed _currentIndex times.\r\n unchecked {\r\n _burnCounter++;\r\n }\r\n }\r\n\r\n /**\r\n * @dev Approve `to` to operate on `tokenId`\r\n *\r\n * Emits a {Approval} event.\r\n */\r\n function _approve(\r\n address to,\r\n uint256 tokenId,\r\n address owner\r\n ) private {\r\n _tokenApprovals[tokenId] = to;\r\n emit Approval(owner, to, tokenId);\r\n }\r\n\r\n /**\r\n * @dev Internal function to invoke {IERC721Receiver-onERC721Received} on a target contract.\r\n *\r\n * @param from address representing the previous owner of the given token ID\r\n * @param to target address that will receive the tokens\r\n * @param tokenId uint256 ID of the token to be transferred\r\n * @param _data bytes optional data to send along with the call\r\n * @return bool whether the call correctly returned the expected magic value\r\n */\r\n function _checkContractOnERC721Received(\r\n address from,\r\n address to,\r\n uint256 tokenId,\r\n bytes memory _data\r\n ) private returns (bool) {\r\n try IERC721Receiver(to).onERC721Received(_msgSender(), from, tokenId, _data) returns (bytes4 retval) {\r\n return retval == IERC721Receiver(to).onERC721Received.selector;\r\n } catch (bytes memory reason) {\r\n if (reason.length == 0) {\r\n revert TransferToNonERC721ReceiverImplementer();\r\n } else {\r\n assembly {\r\n revert(add(32, reason), mload(reason))\r\n }\r\n }\r\n }\r\n }\r\n\r\n /**\r\n * @dev Hook that is called before a set of serially-ordered token ids are about to be transferred. This includes minting.\r\n * And also called before burning one token.\r\n *\r\n * startTokenId - the first token id to be transferred\r\n * quantity - the amount to be transferred\r\n *\r\n * Calling conditions:\r\n *\r\n * - When `from` and `to` are both non-zero, `from`'s `tokenId` will be\r\n * transferred to `to`.\r\n * - When `from` is zero, `tokenId` will be minted for `to`.\r\n * - When `to` is zero, `tokenId` will be burned by `from`.\r\n * - `from` and `to` are never both zero.\r\n */\r\n function _beforeTokenTransfers(\r\n address from,\r\n address to,\r\n uint256 startTokenId,\r\n uint256 quantity\r\n ) internal virtual {}\r\n\r\n /**\r\n * @dev Hook that is called after a set of serially-ordered token ids have been transferred. This includes\r\n * minting.\r\n * And also called after one token has been burned.\r\n *\r\n * startTokenId - the first token id to be transferred\r\n * quantity - the amount to be transferred\r\n *\r\n * Calling conditions:\r\n *\r\n * - When `from` and `to` are both non-zero, `from`'s `tokenId` has been\r\n * transferred to `to`.\r\n * - When `from` is zero, `tokenId` has been minted for `to`.\r\n * - When `to` is zero, `tokenId` has been burned by `from`.\r\n * - `from` and `to` are never both zero.\r\n */\r\n function _afterTokenTransfers(\r\n address from,\r\n address to,\r\n uint256 startTokenId,\r\n uint256 quantity\r\n ) internal virtual {}\r\n}\r\n//2022.8.12\r\n\r\ncontract doodlespunk is ERC721A, Ownable {\r\n\r\n\r\n string public uriPrefix = \"ipfs://QmavwxsrNjXkiTMMMAC13BZdumfERdQZkrQZhuHhdXmDu4/\";\r\n\r\n uint256 public immutable cost = 0.003 ether;\r\n uint32 public immutable maxSUPPLY = 2000;\r\n uint32 public immutable maxPerTx = 4;\r\n\r\n modifier callerIsUser() {\r\n require(tx.origin == msg.sender, \"The caller is another contract\");\r\n _;\r\n }\r\n\r\n constructor()\r\n ERC721A (\"doodlespunk\", \"DP\") {\r\n }\r\n\r\n function _baseURI() internal view override(ERC721A) returns (string memory) {\r\n return uriPrefix;\r\n }\r\n\r\n function setUri(string memory uri) public onlyOwner {\r\n uriPrefix = uri;\r\n }\r\n\r\n function _startTokenId() internal view virtual override(ERC721A) returns (uint256) {\r\n return 0;\r\n }\r\n\r\n function publicMint(uint256 amount) public payable callerIsUser{\r\n require(amount <= maxSUPPLY, \"sold out\");\r\n require(amount <= maxPerTx, \"invalid amount\");\r\n require(msg.value >= cost * amount,\"insufficient\");\r\n _safeMint(msg.sender, amount);\r\n }\r\n\r\n function whiteListDrop(uint256 amount) public onlyOwner {\r\n _whiteListMint(amount);\r\n }\r\n\r\n function withdraw() public onlyOwner {\r\n uint256 sendAmount = address(this).balance;\r\n\r\n address h = payable(msg.sender);\r\n\r\n bool success;\r\n\r\n (success, ) = h.call{value: sendAmount}(\"\");\r\n require(success, \"Transaction Unsuccessful\");\r\n }\r\n}"
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