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{
"language": "Solidity",
"sources": {
"contracts/ValhallaBirds.sol": {
"content": "// SPDX-License-Identifier: MIT\n// File: contracts/ValhallaBirds.sol\n\npragma solidity ^0.8.0;\n\n/**\n * @dev Interface of the ERC165 standard, as defined in the\n * https://eips.ethereum.org/EIPS/eip-165[EIP].\n *\n * Implementers can declare support of contract interfaces, which can then be\n * queried by others ({ERC165Checker}).\n *\n * For an implementation, see {ERC165}.\n */\ninterface IERC165 {\n /**\n * @dev Returns true if this contract implements the interface defined by\n * `interfaceId`. See the corresponding\n * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]\n * to learn more about how these ids are created.\n *\n * This function call must use less than 30 000 gas.\n */\n function supportsInterface(bytes4 interfaceId) external view returns (bool);\n}\n\n// OpenZeppelin Contracts v4.4.1 (token/ERC721/IERC721.sol)\n\npragma solidity ^0.8.0;\n\n/**\n * @dev Required interface of an ERC721 compliant contract.\n */\ninterface IERC721 is IERC165 {\n /**\n * @dev Emitted when `tokenId` token is transferred from `from` to `to`.\n */\n event Transfer(\n address indexed from,\n address indexed to,\n uint256 indexed tokenId\n );\n\n /**\n * @dev Emitted when `owner` enables `approved` to manage the `tokenId` token.\n */\n event Approval(\n address indexed owner,\n address indexed approved,\n uint256 indexed tokenId\n );\n\n /**\n * @dev Emitted when `owner` enables or disables (`approved`) `operator` to manage all of its assets.\n */\n event ApprovalForAll(\n address indexed owner,\n address indexed operator,\n bool approved\n );\n\n /**\n * @dev Returns the number of tokens in ``owner``'s account.\n */\n function balanceOf(address owner) external view returns (uint256 balance);\n\n /**\n * @dev Returns the owner of the `tokenId` token.\n *\n * Requirements:\n *\n * - `tokenId` must exist.\n */\n function ownerOf(uint256 tokenId) external view returns (address owner);\n\n /**\n * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients\n * are aware of the ERC721 protocol to prevent tokens from being forever locked.\n *\n * Requirements:\n *\n * - `from` cannot be the zero address.\n * - `to` cannot be the zero address.\n * - `tokenId` token must exist and be owned by `from`.\n * - If the caller is not `from`, it must be have been allowed to move this token by either {approve} or {setApprovalForAll}.\n * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.\n *\n * Emits a {Transfer} event.\n */\n function safeTransferFrom(\n address from,\n address to,\n uint256 tokenId\n ) external;\n\n /**\n * @dev Transfers `tokenId` token from `from` to `to`.\n *\n * WARNING: Usage of this method is discouraged, use {safeTransferFrom} whenever possible.\n *\n * Requirements:\n *\n * - `from` cannot be the zero address.\n * - `to` cannot be the zero address.\n * - `tokenId` token must be owned by `from`.\n * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.\n *\n * Emits a {Transfer} event.\n */\n function transferFrom(\n address from,\n address to,\n uint256 tokenId\n ) external;\n\n /**\n * @dev Gives permission to `to` to transfer `tokenId` token to another account.\n * The approval is cleared when the token is transferred.\n *\n * Only a single account can be approved at a time, so approving the zero address clears previous approvals.\n *\n * Requirements:\n *\n * - The caller must own the token or be an approved operator.\n * - `tokenId` must exist.\n *\n * Emits an {Approval} event.\n */\n function approve(address to, uint256 tokenId) external;\n\n /**\n * @dev Returns the account approved for `tokenId` token.\n *\n * Requirements:\n *\n * - `tokenId` must exist.\n */\n function getApproved(uint256 tokenId)\n external\n view\n returns (address operator);\n\n /**\n * @dev Approve or remove `operator` as an operator for the caller.\n * Operators can call {transferFrom} or {safeTransferFrom} for any token owned by the caller.\n *\n * Requirements:\n *\n * - The `operator` cannot be the caller.\n *\n * Emits an {ApprovalForAll} event.\n */\n function setApprovalForAll(address operator, bool _approved) external;\n\n /**\n * @dev Returns if the `operator` is allowed to manage all of the assets of `owner`.\n *\n * See {setApprovalForAll}\n */\n function isApprovedForAll(address owner, address operator)\n external\n view\n returns (bool);\n\n /**\n * @dev Safely transfers `tokenId` token from `from` to `to`.\n *\n * Requirements:\n *\n * - `from` cannot be the zero address.\n * - `to` cannot be the zero address.\n * - `tokenId` token must exist and be owned by `from`.\n * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.\n * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.\n *\n * Emits a {Transfer} event.\n */\n function safeTransferFrom(\n address from,\n address to,\n uint256 tokenId,\n bytes calldata data\n ) external;\n}\n\n// OpenZeppelin Contracts v4.4.1 (token/ERC721/IERC721Receiver.sol)\n\npragma solidity ^0.8.0;\n\n/**\n * @title ERC721 token receiver interface\n * @dev Interface for any contract that wants to support safeTransfers\n * from ERC721 asset contracts.\n */\ninterface IERC721Receiver {\n /**\n * @dev Whenever an {IERC721} `tokenId` token is transferred to this contract via {IERC721-safeTransferFrom}\n * by `operator` from `from`, this function is called.\n *\n * It must return its Solidity selector to confirm the token transfer.\n * If any other value is returned or the interface is not implemented by the recipient, the transfer will be reverted.\n *\n * The selector can be obtained in Solidity with `IERC721.onERC721Received.selector`.\n */\n function onERC721Received(\n address operator,\n address from,\n uint256 tokenId,\n bytes calldata data\n ) external returns (bytes4);\n}\n\n// OpenZeppelin Contracts v4.4.1 (token/ERC721/extensions/IERC721Metadata.sol)\n\npragma solidity ^0.8.0;\n\n/**\n * @title ERC-721 Non-Fungible Token Standard, optional metadata extension\n * @dev See https://eips.ethereum.org/EIPS/eip-721\n */\ninterface IERC721Metadata is IERC721 {\n /**\n * @dev Returns the token collection name.\n */\n function name() external view returns (string memory);\n\n /**\n * @dev Returns the token collection symbol.\n */\n function symbol() external view returns (string memory);\n\n /**\n * @dev Returns the Uniform Resource Identifier (URI) for `tokenId` token.\n */\n function tokenURI(uint256 tokenId) external view returns (string memory);\n}\n\n// OpenZeppelin Contracts v4.4.1 (utils/introspection/ERC165.sol)\n\npragma solidity ^0.8.0;\n\n/**\n * @dev Implementation of the {IERC165} interface.\n *\n * Contracts that want to implement ERC165 should inherit from this contract and override {supportsInterface} to check\n * for the additional interface id that will be supported. For example:\n *\n * ```solidity\n * function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {\n * return interfaceId == type(MyInterface).interfaceId || super.supportsInterface(interfaceId);\n * }\n * ```\n *\n * Alternatively, {ERC165Storage} provides an easier to use but more expensive implementation.\n */\nabstract contract ERC165 is IERC165 {\n /**\n * @dev See {IERC165-supportsInterface}.\n */\n function supportsInterface(bytes4 interfaceId)\n public\n view\n virtual\n override\n returns (bool)\n {\n return interfaceId == type(IERC165).interfaceId;\n }\n}\n\n// OpenZeppelin Contracts v4.4.1 (utils/Address.sol)\n\npragma solidity ^0.8.0;\n\n/**\n * @dev Collection of functions related to the address type\n */\nlibrary Address {\n /**\n * @dev Returns true if `account` is a contract.\n *\n * [IMPORTANT]\n * ====\n * It is unsafe to assume that an address for which this function returns\n * false is an externally-owned account (EOA) and not a contract.\n *\n * Among others, `isContract` will return false for the following\n * types of addresses:\n *\n * - an externally-owned account\n * - a contract in construction\n * - an address where a contract will be created\n * - an address where a contract lived, but was destroyed\n * ====\n */\n function isContract(address account) internal view returns (bool) {\n // This method relies on extcodesize, which returns 0 for contracts in\n // construction, since the code is only stored at the end of the\n // constructor execution.\n\n uint256 size;\n assembly {\n size := extcodesize(account)\n }\n return size > 0;\n }\n\n /**\n * @dev Replacement for Solidity's `transfer`: sends `amount` wei to\n * `recipient`, forwarding all available gas and reverting on errors.\n *\n * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost\n * of certain opcodes, possibly making contracts go over the 2300 gas limit\n * imposed by `transfer`, making them unable to receive funds via\n * `transfer`. {sendValue} removes this limitation.\n *\n * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].\n *\n * IMPORTANT: because control is transferred to `recipient`, care must be\n * taken to not create reentrancy vulnerabilities. Consider using\n * {ReentrancyGuard} or the\n * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].\n */\n function sendValue(address payable recipient, uint256 amount) internal {\n require(\n address(this).balance >= amount,\n \"Address: insufficient balance\"\n );\n\n (bool success, ) = recipient.call{value: amount}(\"\");\n require(\n success,\n \"Address: unable to send value, recipient may have reverted\"\n );\n }\n\n /**\n * @dev Performs a Solidity function call using a low level `call`. A\n * plain `call` is an unsafe replacement for a function call: use this\n * function instead.\n *\n * If `target` reverts with a revert reason, it is bubbled up by this\n * function (like regular Solidity function calls).\n *\n * Returns the raw returned data. To convert to the expected return value,\n * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].\n *\n * Requirements:\n *\n * - `target` must be a contract.\n * - calling `target` with `data` must not revert.\n *\n * _Available since v3.1._\n */\n function functionCall(address target, bytes memory data)\n internal\n returns (bytes memory)\n {\n return functionCall(target, data, \"Address: low-level call failed\");\n }\n\n /**\n * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with\n * `errorMessage` as a fallback revert reason when `target` reverts.\n *\n * _Available since v3.1._\n */\n function functionCall(\n address target,\n bytes memory data,\n string memory errorMessage\n ) internal returns (bytes memory) {\n return functionCallWithValue(target, data, 0, errorMessage);\n }\n\n /**\n * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],\n * but also transferring `value` wei to `target`.\n *\n * Requirements:\n *\n * - the calling contract must have an ETH balance of at least `value`.\n * - the called Solidity function must be `payable`.\n *\n * _Available since v3.1._\n */\n function functionCallWithValue(\n address target,\n bytes memory data,\n uint256 value\n ) internal returns (bytes memory) {\n return\n functionCallWithValue(\n target,\n data,\n value,\n \"Address: low-level call with value failed\"\n );\n }\n\n /**\n * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but\n * with `errorMessage` as a fallback revert reason when `target` reverts.\n *\n * _Available since v3.1._\n */\n function functionCallWithValue(\n address target,\n bytes memory data,\n uint256 value,\n string memory errorMessage\n ) internal returns (bytes memory) {\n require(\n address(this).balance >= value,\n \"Address: insufficient balance for call\"\n );\n require(isContract(target), \"Address: call to non-contract\");\n\n (bool success, bytes memory returndata) = target.call{value: value}(\n data\n );\n return verifyCallResult(success, returndata, errorMessage);\n }\n\n /**\n * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],\n * but performing a static call.\n *\n * _Available since v3.3._\n */\n function functionStaticCall(address target, bytes memory data)\n internal\n view\n returns (bytes memory)\n {\n return\n functionStaticCall(\n target,\n data,\n \"Address: low-level static call failed\"\n );\n }\n\n /**\n * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],\n * but performing a static call.\n *\n * _Available since v3.3._\n */\n function functionStaticCall(\n address target,\n bytes memory data,\n string memory errorMessage\n ) internal view returns (bytes memory) {\n require(isContract(target), \"Address: static call to non-contract\");\n\n (bool success, bytes memory returndata) = target.staticcall(data);\n return verifyCallResult(success, returndata, errorMessage);\n }\n\n /**\n * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],\n * but performing a delegate call.\n *\n * _Available since v3.4._\n */\n function functionDelegateCall(address target, bytes memory data)\n internal\n returns (bytes memory)\n {\n return\n functionDelegateCall(\n target,\n data,\n \"Address: low-level delegate call failed\"\n );\n }\n\n /**\n * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],\n * but performing a delegate call.\n *\n * _Available since v3.4._\n */\n function functionDelegateCall(\n address target,\n bytes memory data,\n string memory errorMessage\n ) internal returns (bytes memory) {\n require(isContract(target), \"Address: delegate call to non-contract\");\n\n (bool success, bytes memory returndata) = target.delegatecall(data);\n return verifyCallResult(success, returndata, errorMessage);\n }\n\n /**\n * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the\n * revert reason using the provided one.\n *\n * _Available since v4.3._\n */\n function verifyCallResult(\n bool success,\n bytes memory returndata,\n string memory errorMessage\n ) internal pure returns (bytes memory) {\n if (success) {\n return returndata;\n } else {\n // Look for revert reason and bubble it up if present\n if (returndata.length > 0) {\n // The easiest way to bubble the revert reason is using memory via assembly\n\n assembly {\n let returndata_size := mload(returndata)\n revert(add(32, returndata), returndata_size)\n }\n } else {\n revert(errorMessage);\n }\n }\n }\n}\n\n// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)\n\npragma solidity ^0.8.0;\n\n/**\n * @dev Provides information about the current execution context, including the\n * sender of the transaction and its data. While these are generally available\n * via msg.sender and msg.data, they should not be accessed in such a direct\n * manner, since when dealing with meta-transactions the account sending and\n * paying for execution may not be the actual sender (as far as an application\n * is concerned).\n *\n * This contract is only required for intermediate, library-like contracts.\n */\nabstract contract Context {\n function _msgSender() internal view virtual returns (address) {\n return msg.sender;\n }\n\n function _msgData() internal view virtual returns (bytes calldata) {\n return msg.data;\n }\n}\n\n// OpenZeppelin Contracts v4.4.1 (utils/Strings.sol)\n\npragma solidity ^0.8.0;\n\n/**\n * @dev String operations.\n */\nlibrary Strings {\n bytes16 private constant _HEX_SYMBOLS = \"0123456789abcdef\";\n\n /**\n * @dev Converts a `uint256` to its ASCII `string` decimal representation.\n */\n function toString(uint256 value) internal pure returns (string memory) {\n // Inspired by OraclizeAPI's implementation - MIT licence\n // https://github.com/oraclize/ethereum-api/blob/b42146b063c7d6ee1358846c198246239e9360e8/oraclizeAPI_0.4.25.sol\n\n if (value == 0) {\n return \"0\";\n }\n uint256 temp = value;\n uint256 digits;\n while (temp != 0) {\n digits++;\n temp /= 10;\n }\n bytes memory buffer = new bytes(digits);\n while (value != 0) {\n digits -= 1;\n buffer[digits] = bytes1(uint8(48 + uint256(value % 10)));\n value /= 10;\n }\n return string(buffer);\n }\n\n /**\n * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.\n */\n function toHexString(uint256 value) internal pure returns (string memory) {\n if (value == 0) {\n return \"0x00\";\n }\n uint256 temp = value;\n uint256 length = 0;\n while (temp != 0) {\n length++;\n temp >>= 8;\n }\n return toHexString(value, length);\n }\n\n /**\n * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length.\n */\n function toHexString(uint256 value, uint256 length)\n internal\n pure\n returns (string memory)\n {\n bytes memory buffer = new bytes(2 * length + 2);\n buffer[0] = \"0\";\n buffer[1] = \"x\";\n for (uint256 i = 2 * length + 1; i > 1; --i) {\n buffer[i] = _HEX_SYMBOLS[value & 0xf];\n value >>= 4;\n }\n require(value == 0, \"Strings: hex length insufficient\");\n return string(buffer);\n }\n}\n\n// OpenZeppelin Contracts v4.4.1 (token/ERC721/extensions/IERC721Enumerable.sol)\n\npragma solidity ^0.8.0;\n\n/**\n * @title ERC-721 Non-Fungible Token Standard, optional enumeration extension\n * @dev See https://eips.ethereum.org/EIPS/eip-721\n */\ninterface IERC721Enumerable is IERC721 {\n /**\n * @dev Returns the total amount of tokens stored by the contract.\n */\n function totalSupply() external view returns (uint256);\n\n /**\n * @dev Returns a token ID owned by `owner` at a given `index` of its token list.\n * Use along with {balanceOf} to enumerate all of ``owner``'s tokens.\n */\n function tokenOfOwnerByIndex(address owner, uint256 index)\n external\n view\n returns (uint256 tokenId);\n\n /**\n * @dev Returns a token ID at a given `index` of all the tokens stored by the contract.\n * Use along with {totalSupply} to enumerate all tokens.\n */\n function tokenByIndex(uint256 index) external view returns (uint256);\n}\n\npragma solidity ^0.8.0;\n\n/**\n * @dev Implementation of https://eips.ethereum.org/EIPS/eip-721[ERC721] Non-Fungible Token Standard, including\n * the Metadata and Enumerable extension. Built to optimize for lower gas during batch mints.\n *\n * Assumes serials are sequentially minted starting at 0 (e.g. 0, 1, 2, 3..).\n *\n * Assumes the number of issuable tokens (collection size) is capped and fits in a uint128.\n *\n * Does not support burning tokens to address(0).\n */\ncontract ERC721A is\n Context,\n ERC165,\n IERC721,\n IERC721Metadata,\n IERC721Enumerable\n{\n using Address for address;\n using Strings for uint256;\n\n struct TokenOwnership {\n address addr;\n uint64 startTimestamp;\n }\n\n struct AddressData {\n uint128 balance;\n uint128 numberMinted;\n }\n\n uint256 private currentIndex = 0;\n\n uint256 internal immutable collectionSize;\n uint256 internal immutable maxBatchSize;\n\n // Token name\n string private _name;\n\n // Token symbol\n string private _symbol;\n\n // Mapping from token ID to ownership details\n // An empty struct value does not necessarily mean the token is unowned. See ownershipOf implementation for details.\n mapping(uint256 => TokenOwnership) private _ownerships;\n\n // Mapping owner address to address data\n mapping(address => AddressData) private _addressData;\n\n // Mapping from token ID to approved address\n mapping(uint256 => address) private _tokenApprovals;\n\n // Mapping from owner to operator approvals\n mapping(address => mapping(address => bool)) private _operatorApprovals;\n\n /**\n * @dev\n * `maxBatchSize` refers to how much a minter can mint at a time.\n * `collectionSize_` refers to how many tokens are in the collection.\n */\n constructor(\n string memory name_,\n string memory symbol_,\n uint256 maxBatchSize_,\n uint256 collectionSize_\n ) {\n require(\n collectionSize_ > 0,\n \"ERC721A: collection must have a nonzero supply\"\n );\n require(maxBatchSize_ > 0, \"ERC721A: max batch size must be nonzero\");\n _name = name_;\n _symbol = symbol_;\n maxBatchSize = maxBatchSize_;\n collectionSize = collectionSize_;\n }\n\n /**\n * @dev See {IERC721Enumerable-totalSupply}.\n */\n function totalSupply() public view override returns (uint256) {\n return currentIndex;\n }\n\n /**\n * @dev See {IERC721Enumerable-tokenByIndex}.\n */\n function tokenByIndex(uint256 index) public view override returns (uint256) {\n require(index < totalSupply(), \"ERC721A: global index out of bounds\");\n return index;\n }\n\n /**\n * @dev See {IERC721Enumerable-tokenOfOwnerByIndex}.\n * This read function is O(collectionSize). If calling from a separate contract, be sure to test gas first.\n * It may also degrade with extremely large collection sizes (e.g >> 10000), test for your use case.\n */\n function tokenOfOwnerByIndex(address owner, uint256 index)\n public\n view\n override\n returns (uint256)\n {\n require(index < balanceOf(owner), \"ERC721A: owner index out of bounds\");\n uint256 numMintedSoFar = totalSupply();\n uint256 tokenIdsIdx = 0;\n address currOwnershipAddr = address(0);\n for (uint256 i = 0; i < numMintedSoFar; i++) {\n TokenOwnership memory ownership = _ownerships[i];\n if (ownership.addr != address(0)) {\n currOwnershipAddr = ownership.addr;\n }\n if (currOwnershipAddr == owner) {\n if (tokenIdsIdx == index) {\n return i;\n }\n tokenIdsIdx++;\n }\n }\n revert(\"ERC721A: unable to get token of owner by index\");\n }\n\n /**\n * @dev See {IERC165-supportsInterface}.\n */\n function supportsInterface(bytes4 interfaceId)\n public\n view\n virtual\n override(ERC165, IERC165)\n returns (bool)\n {\n return\n interfaceId == type(IERC721).interfaceId ||\n interfaceId == type(IERC721Metadata).interfaceId ||\n interfaceId == type(IERC721Enumerable).interfaceId ||\n super.supportsInterface(interfaceId);\n }\n\n /**\n * @dev See {IERC721-balanceOf}.\n */\n function balanceOf(address owner) public view override returns (uint256) {\n require(owner != address(0), \"ERC721A: balance query for the zero address\");\n return uint256(_addressData[owner].balance);\n }\n\n function _numberMinted(address owner) internal view returns (uint256) {\n require(\n owner != address(0),\n \"ERC721A: number minted query for the zero address\"\n );\n return uint256(_addressData[owner].numberMinted);\n }\n\n function ownershipOf(uint256 tokenId)\n internal\n view\n returns (TokenOwnership memory)\n {\n require(_exists(tokenId), \"ERC721A: owner query for nonexistent token\");\n\n uint256 lowestTokenToCheck;\n if (tokenId >= maxBatchSize) {\n lowestTokenToCheck = tokenId - maxBatchSize + 1;\n }\n\n for (uint256 curr = tokenId; curr >= lowestTokenToCheck; curr--) {\n TokenOwnership memory ownership = _ownerships[curr];\n if (ownership.addr != address(0)) {\n return ownership;\n }\n }\n\n revert(\"ERC721A: unable to determine the owner of token\");\n }\n\n /**\n * @dev See {IERC721-ownerOf}.\n */\n function ownerOf(uint256 tokenId) public view override returns (address) {\n return ownershipOf(tokenId).addr;\n }\n\n /**\n * @dev See {IERC721Metadata-name}.\n */\n function name() public view virtual override returns (string memory) {\n return _name;\n }\n\n /**\n * @dev See {IERC721Metadata-symbol}.\n */\n function symbol() public view virtual override returns (string memory) {\n return _symbol;\n }\n\n /**\n * @dev See {IERC721Metadata-tokenURI}.\n */\n function tokenURI(uint256 tokenId)\n public\n view\n virtual\n override\n returns (string memory)\n {\n require(\n _exists(tokenId),\n \"ERC721Metadata: URI query for nonexistent token\"\n );\n\n string memory baseURI = _baseURI();\n return\n bytes(baseURI).length > 0\n ? string(abi.encodePacked(baseURI, tokenId.toString(), \".json\"))\n : \"\";\n }\n\n /**\n * @dev Base URI for computing {tokenURI}. If set, the resulting URI for each\n * token will be the concatenation of the `baseURI` and the `tokenId`. Empty\n * by default, can be overriden in child contracts.\n */\n function _baseURI() internal view virtual returns (string memory) {\n return \"\";\n }\n\n /**\n * @dev See {IERC721-approve}.\n */\n function approve(address to, uint256 tokenId) public override {\n address owner = ERC721A.ownerOf(tokenId);\n require(to != owner, \"ERC721A: approval to current owner\");\n\n require(\n _msgSender() == owner || isApprovedForAll(owner, _msgSender()),\n \"ERC721A: approve caller is not owner nor approved for all\"\n );\n\n _approve(to, tokenId, owner);\n }\n\n /**\n * @dev See {IERC721-getApproved}.\n */\n function getApproved(uint256 tokenId) public view override returns (address) {\n require(_exists(tokenId), \"ERC721A: approved query for nonexistent token\");\n\n return _tokenApprovals[tokenId];\n }\n\n /**\n * @dev See {IERC721-setApprovalForAll}.\n */\n function setApprovalForAll(address operator, bool approved) public override {\n require(operator != _msgSender(), \"ERC721A: approve to caller\");\n\n _operatorApprovals[_msgSender()][operator] = approved;\n emit ApprovalForAll(_msgSender(), operator, approved);\n }\n\n /**\n * @dev See {IERC721-isApprovedForAll}.\n */\n function isApprovedForAll(address owner, address operator)\n public\n view\n virtual\n override\n returns (bool)\n {\n return _operatorApprovals[owner][operator];\n }\n\n /**\n * @dev See {IERC721-transferFrom}.\n */\n function transferFrom(\n address from,\n address to,\n uint256 tokenId\n ) public override {\n _transfer(from, to, tokenId);\n }\n\n /**\n * @dev See {IERC721-safeTransferFrom}.\n */\n function safeTransferFrom(\n address from,\n address to,\n uint256 tokenId\n ) public override {\n safeTransferFrom(from, to, tokenId, \"\");\n }\n\n /**\n * @dev See {IERC721-safeTransferFrom}.\n */\n function safeTransferFrom(\n address from,\n address to,\n uint256 tokenId,\n bytes memory _data\n ) public override {\n _transfer(from, to, tokenId);\n require(\n _checkOnERC721Received(from, to, tokenId, _data),\n \"ERC721A: transfer to non ERC721Receiver implementer\"\n );\n }\n\n /**\n * @dev Returns whether `tokenId` exists.\n *\n * Tokens can be managed by their owner or approved accounts via {approve} or {setApprovalForAll}.\n *\n * Tokens start existing when they are minted (`_mint`),\n */\n function _exists(uint256 tokenId) internal view returns (bool) {\n return tokenId < currentIndex;\n }\n\n function _safeMint(address to, uint256 quantity) internal {\n _safeMint(to, quantity, \"\");\n }\n\n /**\n * @dev Mints `quantity` tokens and transfers them to `to`.\n *\n * Requirements:\n *\n * - there must be `quantity` tokens remaining unminted in the total collection.\n * - `to` cannot be the zero address.\n * - `quantity` cannot be larger than the max batch size.\n *\n * Emits a {Transfer} event.\n */\n function _safeMint(\n address to,\n uint256 quantity,\n bytes memory _data\n ) internal {\n uint256 startTokenId = currentIndex;\n require(to != address(0), \"ERC721A: mint to the zero address\");\n // We know if the first token in the batch doesn't exist, the other ones don't as well, because of serial ordering.\n require(!_exists(startTokenId), \"ERC721A: token already minted\");\n require(quantity <= maxBatchSize, \"ERC721A: quantity to mint too high\");\n\n _beforeTokenTransfers(address(0), to, startTokenId, quantity);\n\n AddressData memory addressData = _addressData[to];\n _addressData[to] = AddressData(\n addressData.balance + uint128(quantity),\n addressData.numberMinted + uint128(quantity)\n );\n _ownerships[startTokenId] = TokenOwnership(to, uint64(block.timestamp));\n\n uint256 updatedIndex = startTokenId;\n\n for (uint256 i = 0; i < quantity; i++) {\n emit Transfer(address(0), to, updatedIndex);\n require(\n _checkOnERC721Received(address(0), to, updatedIndex, _data),\n \"ERC721A: transfer to non ERC721Receiver implementer\"\n );\n updatedIndex++;\n }\n\n currentIndex = updatedIndex;\n _afterTokenTransfers(address(0), to, startTokenId, quantity);\n }\n\n /**\n * @dev Transfers `tokenId` from `from` to `to`.\n *\n * Requirements:\n *\n * - `to` cannot be the zero address.\n * - `tokenId` token must be owned by `from`.\n *\n * Emits a {Transfer} event.\n */\n function _transfer(\n address from,\n address to,\n uint256 tokenId\n ) private {\n TokenOwnership memory prevOwnership = ownershipOf(tokenId);\n\n bool isApprovedOrOwner = (_msgSender() == prevOwnership.addr ||\n getApproved(tokenId) == _msgSender() ||\n isApprovedForAll(prevOwnership.addr, _msgSender()));\n\n require(\n isApprovedOrOwner,\n \"ERC721A: transfer caller is not owner nor approved\"\n );\n\n require(\n prevOwnership.addr == from,\n \"ERC721A: transfer from incorrect owner\"\n );\n require(to != address(0), \"ERC721A: transfer to the zero address\");\n\n _beforeTokenTransfers(from, to, tokenId, 1);\n\n // Clear approvals from the previous owner\n _approve(address(0), tokenId, prevOwnership.addr);\n\n _addressData[from].balance -= 1;\n _addressData[to].balance += 1;\n _ownerships[tokenId] = TokenOwnership(to, uint64(block.timestamp));\n\n // If the ownership slot of tokenId+1 is not explicitly set, that means the transfer initiator owns it.\n // Set the slot of tokenId+1 explicitly in storage to maintain correctness for ownerOf(tokenId+1) calls.\n uint256 nextTokenId = tokenId + 1;\n if (_ownerships[nextTokenId].addr == address(0)) {\n if (_exists(nextTokenId)) {\n _ownerships[nextTokenId] = TokenOwnership(\n prevOwnership.addr,\n prevOwnership.startTimestamp\n );\n }\n }\n\n emit Transfer(from, to, tokenId);\n _afterTokenTransfers(from, to, tokenId, 1);\n }\n\n /**\n * @dev Approve `to` to operate on `tokenId`\n *\n * Emits a {Approval} event.\n */\n function _approve(\n address to,\n uint256 tokenId,\n address owner\n ) private {\n _tokenApprovals[tokenId] = to;\n emit Approval(owner, to, tokenId);\n }\n\n uint256 public nextOwnerToExplicitlySet = 0;\n\n /**\n * @dev Explicitly set `owners` to eliminate loops in future calls of ownerOf().\n */\n function _setOwnersExplicit(uint256 quantity) internal {\n uint256 oldNextOwnerToSet = nextOwnerToExplicitlySet;\n require(quantity > 0, \"quantity must be nonzero\");\n uint256 endIndex = oldNextOwnerToSet + quantity - 1;\n if (endIndex > collectionSize - 1) {\n endIndex = collectionSize - 1;\n }\n // We know if the last one in the group exists, all in the group exist, due to serial ordering.\n require(_exists(endIndex), \"not enough minted yet for this cleanup\");\n for (uint256 i = oldNextOwnerToSet; i <= endIndex; i++) {\n if (_ownerships[i].addr == address(0)) {\n TokenOwnership memory ownership = ownershipOf(i);\n _ownerships[i] = TokenOwnership(\n ownership.addr,\n ownership.startTimestamp\n );\n }\n }\n nextOwnerToExplicitlySet = endIndex + 1;\n }\n\n /**\n * @dev Internal function to invoke {IERC721Receiver-onERC721Received} on a target address.\n * The call is not executed if the target address is not a contract.\n *\n * @param from address representing the previous owner of the given token ID\n * @param to target address that will receive the tokens\n * @param tokenId uint256 ID of the token to be transferred\n * @param _data bytes optional data to send along with the call\n * @return bool whether the call correctly returned the expected magic value\n */\n function _checkOnERC721Received(\n address from,\n address to,\n uint256 tokenId,\n bytes memory _data\n ) private returns (bool) {\n if (to.isContract()) {\n try\n IERC721Receiver(to).onERC721Received(_msgSender(), from, tokenId, _data)\n returns (bytes4 retval) {\n return retval == IERC721Receiver(to).onERC721Received.selector;\n } catch (bytes memory reason) {\n if (reason.length == 0) {\n revert(\"ERC721A: transfer to non ERC721Receiver implementer\");\n } else {\n assembly {\n revert(add(32, reason), mload(reason))\n }\n }\n }\n } else {\n return true;\n }\n }\n\n /**\n * @dev Hook that is called before a set of serially-ordered token ids are about to be transferred. This includes minting.\n *\n * startTokenId - the first token id to be transferred\n * quantity - the amount to be transferred\n *\n * Calling conditions:\n *\n * - When `from` and `to` are both non-zero, ``from``'s `tokenId` will be\n * transferred to `to`.\n * - When `from` is zero, `tokenId` will be minted for `to`.\n */\n function _beforeTokenTransfers(\n address from,\n address to,\n uint256 startTokenId,\n uint256 quantity\n ) internal virtual {}\n\n /**\n * @dev Hook that is called after a set of serially-ordered token ids have been transferred. This includes\n * minting.\n *\n * startTokenId - the first token id to be transferred\n * quantity - the amount to be transferred\n *\n * Calling conditions:\n *\n * - when `from` and `to` are both non-zero.\n * - `from` and `to` are never both zero.\n */\n function _afterTokenTransfers(\n address from,\n address to,\n uint256 startTokenId,\n uint256 quantity\n ) internal virtual {}\n}\n\n// OpenZeppelin Contracts v4.4.1 (access/Ownable.sol)\n\npragma solidity ^0.8.0;\n\n/**\n * @dev Contract module which provides a basic access control mechanism, where\n * there is an account (an owner) that can be granted exclusive access to\n * specific functions.\n *\n * By default, the owner account will be the one that deploys the contract. This\n * can later be changed with {transferOwnership}.\n *\n * This module is used through inheritance. It will make available the modifier\n * `onlyOwner`, which can be applied to your functions to restrict their use to\n * the owner.\n */\nabstract contract Ownable is Context {\n address private _owner;\n\n event OwnershipTransferred(\n address indexed previousOwner,\n address indexed newOwner\n );\n\n /**\n * @dev Initializes the contract setting the deployer as the initial owner.\n */\n constructor() {\n _transferOwnership(_msgSender());\n }\n\n /**\n * @dev Returns the address of the current owner.\n */\n function owner() public view virtual returns (address) {\n return _owner;\n }\n\n /**\n * @dev Throws if called by any account other than the owner.\n */\n modifier onlyOwner() {\n require(owner() == _msgSender(), \"You are not the owner\");\n _;\n }\n\n /**\n * @dev Leaves the contract without owner. It will not be possible to call\n * `onlyOwner` functions anymore. Can only be called by the current owner.\n *\n * NOTE: Renouncing ownership will leave the contract without an owner,\n * thereby removing any functionality that is only available to the owner.\n */\n function renounceOwnership() public virtual onlyOwner {\n _transferOwnership(address(0));\n }\n\n /**\n * @dev Transfers ownership of the contract to a new account (`newOwner`).\n * Can only be called by the current owner.\n */\n function transferOwnership(address newOwner) public virtual onlyOwner {\n require(\n newOwner != address(0),\n \"Ownable: new owner is the zero address\"\n );\n _transferOwnership(newOwner);\n }\n\n /**\n * @dev Transfers ownership of the contract to a new account (`newOwner`).\n * Internal function without access restriction.\n */\n function _transferOwnership(address newOwner) internal virtual {\n address oldOwner = _owner;\n _owner = newOwner;\n emit OwnershipTransferred(oldOwner, newOwner);\n }\n}\n\n\npragma solidity ^0.8.0;\n\ncontract ValhallaBirds is ERC721A, Ownable {\n uint256 public NFT_PRICE = 0.0015 ether;\n uint256 public MAX_SUPPLY = 999;\n uint256 public MAX_MINTS = 10;\n string public baseURI = \"ipfs://bafybeifyedsv72g3sqbbnglwdodiyxfczbf75b4bdyotv34cukzo7s5mdq/\";\n string public baseExtension = \".json\";\n bool public paused = false;\n \n constructor() ERC721A(\"Valhalla Birds\", \"VAL\", MAX_MINTS, MAX_SUPPLY) { \n }\n \n\n function Mint(uint256 numTokens) public payable {\n require(!paused, \"Paused\");\n require(numTokens > 0 && numTokens <= MAX_MINTS);\n require(totalSupply() + numTokens <= MAX_SUPPLY);\n require(MAX_MINTS >= numTokens, \"Excess max per paid tx\");\n require(msg.value >= numTokens * NFT_PRICE, \"Invalid funds provided\");\n _safeMint(msg.sender, numTokens);\n }\n\n function DevsMint(uint256 numTokens) public payable onlyOwner {\n _safeMint(msg.sender, numTokens);\n }\n\n\n function pause(bool _state) public onlyOwner {\n paused = _state;\n }\n\n function setBaseURI(string memory newBaseURI) public onlyOwner {\n baseURI = newBaseURI;\n }\n function tokenURI(uint256 _tokenId)\n public\n view\n override\n returns (string memory)\n {\n require(_exists(_tokenId), \"That token doesn't exist\");\n return\n bytes(baseURI).length > 0\n ? string(\n abi.encodePacked(\n baseURI,\n Strings.toString(_tokenId),\n baseExtension\n )\n )\n : \"\";\n }\n\n function setPrice(uint256 newPrice) public onlyOwner {\n NFT_PRICE = newPrice;\n }\n\n function setMaxMints(uint256 newMax) public onlyOwner {\n MAX_MINTS = newMax;\n }\n\n function _baseURI() internal view virtual override returns (string memory) {\n return baseURI;\n }\n\n function withdrawMoney() external onlyOwner {\n (bool success, ) = msg.sender.call{value: address(this).balance}(\"\");\n require(success, \"WITHDRAW FAILED!\");\n }\n}"
}
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"runs": 200
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