creation_sourcecode: {{
    "language": "Solidity",
    "sources": {
      "NFTBoxesV2Upgradeable.sol": {
        "content": "// SPDX-License-Identifier: UNLICENSED\npragma solidity ^0.8.2;\n\nimport \"IVendingMachine.sol\";\nimport \"SubscriptionService.sol\";\nimport \"BoxJsonParser.sol\";\n\nimport \"DefaultOperatorFiltererUpgradeable.sol\";\nimport \"ERC721Upgradeable.sol\";\nimport \"ERC2981Upgradeable.sol\";\nimport \"OwnableUpgradeable.sol\";\n\n\ncontract NFTBoxesBoxUpgradeableV2 is ERC721Upgradeable, OwnableUpgradeable, ERC2981Upgradeable {\n    \n\tstruct BoxMould{\n\t\tuint8\t\t\t\tlive; // bool\n\t\tuint8\t\t\t\tshared; // bool\n\t\tuint128\t\t\t\tmaxEdition;\n\t\tuint128\t\t\t\tmaxBuyAmount;\n\t\tuint128\t\t\t\tcurrentEditionCount;\n\t\tuint128\t\t\t\tboughtCount;\n\t\tuint256\t\t\t\tprice;\n\t\taddress payable[]\tartists;\n\t\tuint256[]\t\t\tshares;\n\t\tstring\t\t\t\tname;\n\t\tstring\t\t\t\tseries;\n\t\tstring\t\t\t\ttheme;\n\t\tstring\t\t\t\tipfsHash;\n\t\tstring\t\t\t\tarweaveHash;\n\t}\n\n\tstruct Box {\n\t\tuint256\t\t\t\tmouldId;\n\t\tuint256\t\t\t\tedition;\n\t}\n\n\tuint256 totalSupply;\n\tIVendingMachine public\tvendingMachine;\n\tSubscriptionService public subService;\n\tuint256 public\t\t\tboxMouldCount;\n\n\tuint256 constant public TOTAL_SHARES = 1000;\n\n\tmapping(uint256 => BoxMould) public\tboxMoulds;\n\tmapping(uint256 =>  Box) public\tboxes;\n\tmapping(uint256 => bool) public lockedBoxes;\n\tmapping(uint256 => mapping(address => uint256)) boxBoughtMapping;\n\tmapping(uint256 => uint256) subDistroTracker;\n\tmapping(uint256 => uint256) public boughtMP;\n\n\tmapping(address => uint256) public teamShare;\n\taddress payable[] public team;\n\taddress public parser;\n\n\n\tmapping(address => bool) public authorisedCaller;\n\n\tevent BoxMouldCreated(uint256 id);\n\tevent BoxBought(uint256 indexed boxMould, uint256 boxEdition, uint256 tokenId);\n\tevent BatchDeployed(uint256 indexed boxMould, uint256 batchSize);\n\n\tfunction initialize(address _service, address _parser) public initializer {\n\t\t__Ownable_init();\n\t\t__ERC721_init(\"NFTBox\", \"[BOX]\");\n\t\tboxMouldCount = 4;\n\t\tteam.push(payable(0x3428B1746Dfd26C7C725913D829BE2706AA89B2e));\n\t\tteam.push(payable(0x4125515f4e5A0db45316bf05a7C102c13e1e5Ba1));\n\t\tteam.push(payable(0x8C26a91205e531E8B35Cf3315f384727B9681D75));\n\n\t\tteamShare[address(0x3428B1746Dfd26C7C725913D829BE2706AA89B2e)] = 590;\n        teamShare[address(0x4125515f4e5A0db45316bf05a7C102c13e1e5Ba1)] = 90;\n\t\tteamShare[address(0x8C26a91205e531E8B35Cf3315f384727B9681D75)] = 30;\n\t\tvendingMachine = IVendingMachine(0x5b8D524b10b8Ea587da49F426a76396F80b7bC84);\n\t\tsubService = SubscriptionService(_service);\n\t\tparser = _parser;\n\t}\n\n\n\tfunction supportsInterface(bytes4 interfaceId) public view override(ERC721Upgradeable, ERC2981Upgradeable) returns (bool) {\n        return ERC2981Upgradeable.supportsInterface(interfaceId)\n            || ERC721Upgradeable.supportsInterface(interfaceId);\n    }\n\n\tfunction setDefaultRoyalty(address _receiver, uint96 _feeNumerator) external onlyOwner {\n\t\t_setDefaultRoyalty(_receiver, _feeNumerator);\n\t} \n\n\tmodifier authorised() {\n\t\trequire(authorisedCaller[msg.sender] || msg.sender == owner(), \"Not authorised to execute.\");\n\t\t_;\n\t}\n\n\tfunction setSubService(address _newSub) external onlyOwner {\n\t\tsubService = SubscriptionService(_newSub);\n\t}\n\n\tfunction setCaller(address _caller, bool _value) external onlyOwner {\n\t\tauthorisedCaller[_caller] = _value;\n\t}\n\n\tfunction addTeamMember(address payable _member) external onlyOwner {\n\t\tfor (uint256 i = 0; i < team.length; i++)\n\t\t\trequire( _member != team[i], \"members exists already\");\n\t\tteam.push(_member);\n\t}\n\n\tfunction removeTeamMember(address payable _member) external onlyOwner {\n\t\tfor (uint256 i = 0; i < team.length; i++)\n\t\t\tif (team[i] == _member) {\n\t\t\t\tdelete teamShare[_member];\n\t\t\t\tteam[i] = team[team.length - 1];\n\t\t\t\tteam.pop();\n\t\t\t}\n\t}\n\n\tfunction setTeamShare(address _member, uint _share) external onlyOwner {\n\t\trequire(_share <= TOTAL_SHARES, \"share must be below 1000\");\n\t\tfor (uint256 i = 0; i < team.length; i++)\n\t\t\tif (team[i] == _member)\n\t\t\t\tteamShare[_member] = _share;\n\t}\n\n\tfunction setLockOnBox(uint256 _id, bool _lock) external authorised {\n\t\trequire(_id <= boxMouldCount && _id > 0, \"ID !exist.\");\n\t\tlockedBoxes[_id] = _lock;\n\t}\n\n\tfunction createBoxMould(\n\t\tuint128 _max,\n\t\tuint128 _maxBuyAmount,\n\t\tuint256 _price,\n\t\taddress payable[] memory _artists,\n\t\tuint256[] memory _shares,\n\t\tstring memory _name,\n\t\tstring memory _series,\n\t\tstring memory _theme,\n\t\tstring memory _ipfsHash,\n\t\tstring memory _arweaveHash)\n\t\texternal\n\t\tonlyOwner {\n\t\trequire(_artists.length == _shares.length, \"arrays !same len\");\n\t\tboxMoulds[boxMouldCount + 1] = BoxMould({\n\t\t\tlive: uint8(0),\n\t\t\tshared: uint8(0),\n\t\t\tmaxEdition: _max,\n\t\t\tmaxBuyAmount: _maxBuyAmount,\n\t\t\tcurrentEditionCount: 0,\n\t\t\tboughtCount: 0,\n\t\t\tprice: _price,\n\t\t\tartists: _artists,\n\t\t\tshares: _shares,\n\t\t\tname: _name,\n\t\t\tseries: _series,\n\t\t\ttheme: _theme,\n\t\t\tipfsHash: _ipfsHash,\n\t\t\tarweaveHash: _arweaveHash\n\t\t});\n\t\tboxMouldCount++;\n\t\tlockedBoxes[boxMouldCount] = true;\n\t\temit BoxMouldCreated(boxMouldCount);\n\t}\n\n\tfunction removeArtist(uint256 _id, address payable _artist) external onlyOwner {\n\t\tBoxMould storage boxMould = boxMoulds[_id];\n\t\trequire(_id <= boxMouldCount && _id > 0, \"ID !exist\");\n\t\tfor (uint256 i = 0; i < boxMould.artists.length; i++) {\n\t\t\tif (boxMould.artists[i] == _artist) {\n\t\t\t\tboxMould.artists[i] = boxMould.artists[boxMould.artists.length - 1];\n\t\t\t\tboxMould.artists.pop();\n\t\t\t\tboxMould.shares[i] = boxMould.shares[boxMould.shares.length - 1];\n\t\t\t\tboxMould.shares.pop();\n\t\t\t}\n\t\t}\n\t}\n\t\n\tfunction addArtists(uint256 _id, address payable _artist, uint256 _share) external onlyOwner {\n\t\tBoxMould storage boxMould = boxMoulds[_id];\n\t\trequire(_id <= boxMouldCount && _id > 0, \"ID !exist\");\n\t\tboxMould.artists.push(_artist);\n\t\tboxMould.shares.push(_share);\n\t}\n\n\tfunction distributeBoxToSubHolders(uint256 _id) external onlyOwner {\n\t\trequire(_id <= boxMouldCount && _id > 0, \"ID !exist\");\n\t\tuint256 trackerId = subDistroTracker[_id]++;\n\t\trequire(trackerId < 10, \"Distro done\");\n\n\t\tBoxMould storage boxMould = boxMoulds[_id];\n\t\tuint128 currentEdition = boxMould.currentEditionCount;\n\t\taddress[] memory subHolders = subService.fetchValidHolders(trackerId * 50, 50);\n\t\tuint256 mintTracker;\n\t\tuint256 _totalSupply = totalSupply;\n\t\tfor (uint256 i = 0; i < 50; i++) {\n\t\t\taddress holder = subHolders[i];\n\t\t\tif (holder != address(0)) {\n\t\t\t\t_buy(currentEdition, _id, mintTracker, holder, _totalSupply + mintTracker + 1);\n\t\t\t\tmintTracker++;\n\t\t\t}\n\t\t}\n\t\ttotalSupply += mintTracker;\n\t\tboxMould.currentEditionCount += uint128(mintTracker);\n\t\tif (currentEdition + mintTracker == boxMould.maxEdition)\n\t\t\tboxMould.live = uint8(1);\n\t\tif (trackerId == 9)\n\t\t\tsubService.pushNewBox();\n\t}\n\n\tfunction distroBoxMP(uint256 _id, address[] calldata _users) external authorised {\n\t\tBoxMould storage boxMould = boxMoulds[_id];\n\t\tuint128 currentEdition = boxMould.currentEditionCount;\n\t\tuint128 max = boxMould.maxEdition;\n\t\tuint128 quantity = uint128(_users.length);\n\t\trequire(_id <= boxMouldCount && _id > 0, \"ID !exist\");\n\t\trequire(boxMould.live == 0, \"!live\");\n\t\trequire(!lockedBoxes[_id], \"locked\");\n\t\trequire(currentEdition + _users.length <= max, \"!many\");\n\n\t\tuint256 _totalSupply = totalSupply;\n\t\tfor (uint128 i = 0; i < quantity; i++)\n\t\t\t_buy(currentEdition, _id, i, _users[i], _totalSupply + i + 1);\n\t\ttotalSupply += quantity;\n\t\tboxMould.currentEditionCount += quantity;\n\t\tboughtMP[_id] += quantity;\n\t\tif (currentEdition + quantity == max)\n\t\t\tboxMould.live = uint8(1);\n\t}\n\n\tfunction buyManyBoxes(uint256 _id, uint128 _quantity) external payable {\n\t\tBoxMould storage boxMould = boxMoulds[_id];\n\t\tuint128 currentEdition = boxMould.currentEditionCount;\n\t\tuint128 max = boxMould.maxEdition;\n\t\trequire(_id <= boxMouldCount && _id > 0, \"ID !exist\");\n\t\trequire(boxMould.live == 0, \"!live\");\n\t\trequire(!lockedBoxes[_id], \"locked\");\n\t\trequire(boxMould.price * _quantity == msg.value, \"!price\");\n\t\trequire(currentEdition + _quantity <= max, \"!many\");\n\t\trequire(boxBoughtMapping[_id][msg.sender] + _quantity <= boxMould.maxBuyAmount, \"!buy\");\n\n\t\tuint256 _totalSupply = totalSupply;\n\t\tfor (uint128 i = 0; i < _quantity; i++)\n\t\t\t_buy(currentEdition, _id, i, msg.sender, _totalSupply + i + 1);\n\t\ttotalSupply += _quantity;\n\t\tboxMould.currentEditionCount += _quantity;\n\t\tboxMould.boughtCount += _quantity;\n\t\tboxBoughtMapping[_id][msg.sender] = boxBoughtMapping[_id][msg.sender] + _quantity;\n\t\tif (currentEdition + _quantity == max)\n\t\t\tboxMould.live = uint8(1);\n\t}\n\n\tfunction _buy(uint128 _currentEdition, uint256 _id, uint256 _new, address _recipient, uint256 _tokenId) internal {\n\t\tboxes[_tokenId] = Box(_id, _currentEdition + _new + 1);\n\t\temit BoxBought(_id, _currentEdition + _new + 1, _tokenId);\n\t\t_mint(_recipient, _tokenId);\n\t}\n\n\t// close a sale if not sold out\n\tfunction closeBox(uint256 _id) external authorised {\n\t\tBoxMould storage boxMould = boxMoulds[_id];\n\t\trequire(_id <= boxMouldCount && _id > 0, \"ID !exist.\");\n\t\tboxMould.live = uint8(1);\n\t}\n\n\tfunction setVendingMachine(address _machine) external onlyOwner {\n\t\tvendingMachine = IVendingMachine(_machine);\n\t}\n\n\tfunction distributeOffchain(uint256 _id, address[][] calldata _recipients, uint256[] calldata _ids) external authorised {\n\t\tBoxMould memory boxMould= boxMoulds[_id];\n\t\trequire(boxMould.live == 1, \"live\");\n\t\trequire (_recipients[0].length == _ids.length, \"bad array\");\n\n\t\t// i is batch number\n\t\tfor (uint256 i = 0; i < _recipients.length; i++) {\n\t\t\t// j is for the index of nft ID to send\n\t\t\tfor (uint256 j = 0;j <  _recipients[0].length; j++)\n\t\t\t\tvendingMachine.NFTMachineFor(_ids[j], _recipients[i][j]);\n\t\t}\n\t\temit BatchDeployed(_id, _recipients.length);\n\t}\n\n\tfunction distributeShares(uint256 _id) external {\n\t\tBoxMould storage boxMould= boxMoulds[_id];\n\t\trequire(_id <= boxMouldCount && _id > 0, \"ID !exist.\");\n\t\trequire(boxMould.live == 1 && boxMould.shared == 0,  \"!distribute\");\n\t\trequire(is100(_id), \"sum != 100%.\");\n\n\t\tboxMould.shared = 1;\n\t\tuint256 rev = uint256(boxMould.boughtCount) * boxMould.price;\n\t\tuint256 share;\n\t\tfor (uint256 i = 0; i < team.length; i++) {\n\t\t\tshare = rev * teamShare[team[i]] / TOTAL_SHARES;\n\t\t\tteam[i].transfer(share);\n\t\t}\n\t\tfor (uint256 i = 0; i < boxMould.artists.length; i++) {\n\t\t\tshare = rev * boxMould.shares[i] / TOTAL_SHARES;\n\t\t\tboxMould.artists[i].transfer(share);\n\t\t}\n\t}\n\n\tfunction is100(uint256 _id) internal view returns(bool) {\n\t\tBoxMould storage boxMould= boxMoulds[_id];\n\t\tuint256 total;\n\t\tfor (uint256 i = 0; i < team.length; i++) {\n\t\t\ttotal = total + teamShare[team[i]];\n\t\t}\n\t\tfor (uint256 i = 0; i < boxMould.shares.length; i++) {\n\t\t\ttotal = total + boxMould.shares[i];\n\t\t}\n\t\treturn total == TOTAL_SHARES;\n\t}\n\n\tfunction getArtist(uint256 _id) external view returns (address payable[] memory) {\n\t\treturn boxMoulds[_id].artists;\n\t}\n\n\tfunction getArtistShares(uint256 _id) external view returns (uint256[] memory) {\n\t\treturn boxMoulds[_id].shares;\n\t}\n\n    function getBoxMetaData(uint256 _id) external view returns \n    (uint256 boxId, uint256 boxEdition, uint128 boxMax, string memory boxName, string memory boxSeries, string memory boxTheme, string memory boxHashIPFS, string memory boxHashArweave) {\n        Box memory box = boxes[_id];\n        BoxMould memory mould = boxMoulds[box.mouldId];\n        return (box.mouldId, box.edition, mould.maxEdition, mould.name, mould.series, mould.theme, mould.ipfsHash, mould.arweaveHash);\n    }\n\n\tfunction _transfer(address from, address to, uint256 tokenId) internal override {\n\t\tBox memory box = boxes[tokenId];\n\t\trequire(!lockedBoxes[box.mouldId], \"Box is locked\");\n\t\tsuper._transfer(from, to, tokenId);\n\t}\n\n\tfunction tokenURI(uint256 _tokenId) public view override returns(string memory) {\n\t\tBox memory box = boxes[_tokenId];\n\t\trequire(box.mouldId > 0);\n\t\tBoxMould memory mould = boxMoulds[box.mouldId];\n\t\treturn string(\n\t\t\tabi.encodePacked(\n\t\t\t\tBoxJsonParser(parser).generateTokenUriPart1(box.edition, mould.series, mould.name, mould.theme),\n\t\t\t\tBoxJsonParser(parser).generateTokenUriPart2(box.mouldId, box.edition, mould.maxEdition, mould.series, mould.ipfsHash, mould.theme)\n\t\t\t)\n\t\t);\n\t}\n}\n"
      },
      "IVendingMachine.sol": {
        "content": "pragma solidity ^0.8.2;\n\nimport \"IERC1155.sol\";\n\ninterface IVendingMachine  is IERC1155{\n\n\tfunction NFTMachineFor(uint256 NFTId, address _recipient) external;\n}"
      },
      "IERC1155.sol": {
        "content": "// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts v4.4.1 (token/ERC1155/IERC1155.sol)\n\npragma solidity ^0.8.0;\n\nimport \"IERC165.sol\";\n\n/**\n * @dev Required interface of an ERC1155 compliant contract, as defined in the\n * https://eips.ethereum.org/EIPS/eip-1155[EIP].\n *\n * _Available since v3.1._\n */\ninterface IERC1155 is IERC165 {\n    /**\n     * @dev Emitted when `value` tokens of token type `id` are transferred from `from` to `to` by `operator`.\n     */\n    event TransferSingle(address indexed operator, address indexed from, address indexed to, uint256 id, uint256 value);\n\n    /**\n     * @dev Equivalent to multiple {TransferSingle} events, where `operator`, `from` and `to` are the same for all\n     * transfers.\n     */\n    event TransferBatch(\n        address indexed operator,\n        address indexed from,\n        address indexed to,\n        uint256[] ids,\n        uint256[] values\n    );\n\n    /**\n     * @dev Emitted when `account` grants or revokes permission to `operator` to transfer their tokens, according to\n     * `approved`.\n     */\n    event ApprovalForAll(address indexed account, address indexed operator, bool approved);\n\n    /**\n     * @dev Emitted when the URI for token type `id` changes to `value`, if it is a non-programmatic URI.\n     *\n     * If an {URI} event was emitted for `id`, the standard\n     * https://eips.ethereum.org/EIPS/eip-1155#metadata-extensions[guarantees] that `value` will equal the value\n     * returned by {IERC1155MetadataURI-uri}.\n     */\n    event URI(string value, uint256 indexed id);\n\n    /**\n     * @dev Returns the amount of tokens of token type `id` owned by `account`.\n     *\n     * Requirements:\n     *\n     * - `account` cannot be the zero address.\n     */\n    function balanceOf(address account, uint256 id) external view returns (uint256);\n\n    /**\n     * @dev xref:ROOT:erc1155.adoc#batch-operations[Batched] version of {balanceOf}.\n     *\n     * Requirements:\n     *\n     * - `accounts` and `ids` must have the same length.\n     */\n    function balanceOfBatch(address[] calldata accounts, uint256[] calldata ids)\n        external\n        view\n        returns (uint256[] memory);\n\n    /**\n     * @dev Grants or revokes permission to `operator` to transfer the caller's tokens, according to `approved`,\n     *\n     * Emits an {ApprovalForAll} event.\n     *\n     * Requirements:\n     *\n     * - `operator` cannot be the caller.\n     */\n    function setApprovalForAll(address operator, bool approved) external;\n\n    /**\n     * @dev Returns true if `operator` is approved to transfer ``account``'s tokens.\n     *\n     * See {setApprovalForAll}.\n     */\n    function isApprovedForAll(address account, address operator) external view returns (bool);\n\n    /**\n     * @dev Transfers `amount` tokens of token type `id` from `from` to `to`.\n     *\n     * Emits a {TransferSingle} event.\n     *\n     * Requirements:\n     *\n     * - `to` cannot be the zero address.\n     * - If the caller is not `from`, it must be have been approved to spend ``from``'s tokens via {setApprovalForAll}.\n     * - `from` must have a balance of tokens of type `id` of at least `amount`.\n     * - If `to` refers to a smart contract, it must implement {IERC1155Receiver-onERC1155Received} and return the\n     * acceptance magic value.\n     */\n    function safeTransferFrom(\n        address from,\n        address to,\n        uint256 id,\n        uint256 amount,\n        bytes calldata data\n    ) external;\n\n    /**\n     * @dev xref:ROOT:erc1155.adoc#batch-operations[Batched] version of {safeTransferFrom}.\n     *\n     * Emits a {TransferBatch} event.\n     *\n     * Requirements:\n     *\n     * - `ids` and `amounts` must have the same length.\n     * - If `to` refers to a smart contract, it must implement {IERC1155Receiver-onERC1155BatchReceived} and return the\n     * acceptance magic value.\n     */\n    function safeBatchTransferFrom(\n        address from,\n        address to,\n        uint256[] calldata ids,\n        uint256[] calldata amounts,\n        bytes calldata data\n    ) external;\n}\n"
      },
      "IERC165.sol": {
        "content": "// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts v4.4.1 (utils/introspection/IERC165.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"
      },
      "SubscriptionService.sol": {
        "content": "// SPDX-License-Identifier: UNLICENSED\npragma solidity ^0.8.2;\n\nimport \"ERC721Enumerable.sol\";\nimport \"Ownable.sol\";\nimport \"SubJsonParser.sol\";\n\ncontract SubscriptionService is ERC721Enumerable, Ownable, SubJsonParser {\n\n\tstruct SubData {\n\t\tuint32 tier;\n\t\tuint32 start;\n\t\tuint32 length;\n\t}\n\n\tuint256 public constant MAX = 500;\n\tuint256 public maxSupply = 300;\n\tbool public paused;\n\tuint32 public counter;\n\n\tuint256[3] public subPrice;\n\tuint256 buyCounter;\n\n\tmapping(uint256 => uint256) expiredStack;\n\tuint256 expiredCounter;\n\tmapping(uint256 => SubData) public subData;\n\tmapping(address => bool) public authorisedCaller;\n\n\tbool public initiated;\n\n\tbool public buySwitch;\n\n\tevent SubBought(address indexed buyer, uint256 indexed tokenId, uint32 tier, uint256 value);\n\n\tconstructor(string memory _name, string memory _symbol)  ERC721(_name, _symbol) {}\n\n\tfunction init (string memory __name, string memory __symbol) external {\n\t\trequire(!initiated);\n\t\tinitiated = true;\n\t\tpaused = false;\n\t\tsubPrice[0] = 1_950_000_000_000_000_000;\n\t\tsubPrice[1] = 3_705_000_000_000_000_000;\n\t\tsubPrice[2] = 5_265_000_000_000_000_000;\n\n\t\tcounter = 1;\n\t\t_name = __name;\n\t\t_symbol = __symbol;\n\t\t_owner = msg.sender;\n\t}\n\n\tmodifier notPaused() {\n\t\trequire(!paused, \"Paused\");\n\t\t_;\n\t}\n\n\tmodifier authorised() {\n\t\trequire(authorisedCaller[msg.sender] || msg.sender == owner(), \"Not authorised to execute.\");\n\t\t_;\n\t}\n\n\tmodifier nonBuyable() {\n\t\trequire(!buySwitch, \"Not authorised to buy.\");\n\t\t_;\n\t}\n\n\tfunction setCaller(address _caller, bool _value) external onlyOwner {\n\t\tauthorisedCaller[_caller] = _value;\n\t}\n\n\tfunction fetchEth() external onlyOwner {\n\t\tpayable(owner()).transfer(address(this).balance);\n\t}\n\n\tfunction pause() external onlyOwner {\n\t\tpaused = true;\n\t}\n\n\tfunction unpause() external onlyOwner {\n\t\tpaused = false;\n\t}\n\n\tfunction switchIt() external onlyOwner {\n\t\tbuySwitch = !buySwitch;\n\t}\n\n\tfunction pushNewBox() external authorised {\n\t\tcounter++;\n\t}\n\n\tfunction setPrice(uint256 _index, uint256 _price) external onlyOwner {\n\t\tsubPrice[_index] = _price;\n\t}\n\n\tfunction setMaxSupply(uint256 _max) external onlyOwner {\n\t\trequire(_max <= MAX);\n\t\tmaxSupply = _max;\n\t}\n\n\tfunction refundSub(uint256 _tokenId) external onlyOwner {\n\t\trequire(!isExpired(_tokenId), \"Expired\");\n\t\tSubData memory data = subData[_tokenId];\n\t\texpiredStack[expiredCounter++] = _tokenId;\n\t\tdelete subData[_tokenId];\n\t\t_burn(_tokenId);\n\t}\n\n\tfunction expireSub(uint256 _tokenId) external {\n\t\trequire(isExpired(_tokenId), \"Not expired\");\n\t\texpiredStack[expiredCounter++] = _tokenId;\n\t\tdelete subData[_tokenId];\n\t\t_burn(_tokenId);\n\t}\n\n\tfunction buySub(uint8 _tier) external payable {\n\t\tbuySub(_tier, msg.sender);\n\t}\n\n\tfunction buySubOwner(uint8 _tier, address _for) public authorised {\n\t\t// require(_tier == 0 || _tier == 1 || _tier == 2, \"Sub: Wrong sub model\");\n\t\trequire(_tier == 0, \"Sub: Wrong sub model\");\n\t\trequire(totalSupply() < maxSupply, \"No more subs of that tier to buy\");\n\n\t\tif (buyCounter < MAX) {\n\t\t\tsubData[++buyCounter] = SubData(_tier, counter, _getLength(_tier));\n\t\t\t_mint(_for, buyCounter);\n\t\t\temit SubBought(_for, buyCounter, _tier, 1);\n\t\t}\n\t\telse {\n\t\t\trequire(expiredCounter > 0, \"No subs available, try next month\");\n\t\t\tuint256 id = expiredStack[--expiredCounter];\n\t\t\tsubData[id] = SubData(_tier, counter, _getLength(_tier));\n\t\t\t_mint(_for, id);\n\t\t\temit SubBought(_for, id, _tier, 1);\n\t\t}\n\t}\n\n\tfunction buySub(uint8 _tier, address _for) public payable nonBuyable {\n\t\t// require(_tier == 0 || _tier == 1 || _tier == 2, \"Sub: Wrong sub model\");\n\t\trequire(_tier == 0, \"Sub: Wrong sub model\");\n\t\trequire(totalSupply() < maxSupply, \"No more subs of that tier to buy\");\n\t\trequire(msg.value == subPrice[_tier], \"!price\");\n\n\t\tif (buyCounter < MAX) {\n\t\t\tsubData[++buyCounter] = SubData(_tier, counter, _getLength(_tier));\n\t\t\t_mint(_for, buyCounter);\n\t\t\temit SubBought(_for, buyCounter, _tier, msg.value);\n\t\t}\n\t\telse {\n\t\t\trequire(expiredCounter > 0, \"No subs available, try next month\");\n\t\t\tuint256 id = expiredStack[--expiredCounter];\n\t\t\tsubData[id] = SubData(_tier, counter, _getLength(_tier));\n\t\t\t_mint(_for, id);\n\t\t\temit SubBought(_for, id, _tier, msg.value);\n\t\t}\n\t}\n\n\tfunction isExpired(uint256 _tokenId) public view returns(bool) {\n\t\tSubData memory data = subData[_tokenId];\n\t\treturn data.start + data.length <= counter;\n\t}\n\n\tfunction _getType(uint32 _length) internal pure returns(uint256) {\n\t\tif (_length == 3)\n\t\t\treturn 0;\n\t\telse if (_length == 6)\n\t\t\treturn 1;\n\t\tif (_length == 9)\n\t\t\treturn 2;\n\t\treturn 0;\n\t}\n\n\tfunction _getLength(uint8 _type) internal pure returns(uint32) {\n\t\tif (_type == uint8(0))\n\t\t\treturn uint32(3);\n\t\telse if (_type == uint8(1))\n\t\t\treturn uint32(6);\n\t\tif (_type == uint8(2))\n\t\t\treturn uint32(9);\n\t\treturn 0;\n\t}\n\n\tfunction fetchValidHolders(uint256 _start, uint256 _len) external view returns(address[] memory holders) {\n\t\tholders = new address[](_len);\n\t\tfor (uint256 i = _start; i < _start + _len; i++) {\n\t\t\tif (_exists(i)) {\n\t\t\t\taddress owner = ownerOf(i);\n\t\t\t\tif (!isExpired(i))\n\t\t\t\t\tholders[i - _start] = ownerOf(i);\n\t\t\t}\n\t\t}\n\t}\n\n\tfunction returnSubDataOfHolder(address _holder) external view returns(SubData[] memory data) {\n\t\tuint256 amount = balanceOf(_holder);\n\t\tdata = new SubData[](amount);\n\t\tfor (uint256 i = 0; i < amount; i++) {\n\t\t\tdata[i] = subData[tokenOfOwnerByIndex(_holder, i)];\n\t\t}\n\t}\n\n\tfunction hasUserSub(address _holder, uint256 _tierId) external view returns(bool) {\n\t\tuint256 amount = balanceOf(_holder);\n\t\tfor (uint256 i = 0; i < amount; i++) {\n\t\t\tuint256 tokenId = tokenOfOwnerByIndex(_holder, i);\n\t\t\tSubData memory data = subData[tokenId];\n\t\t\tif (data.tier == _tierId && !isExpired(tokenId))\n\t\t\t\treturn true;\n\t\t}\n\t\treturn false;\n\t}\n\n\tfunction _transfer(address from, address to, uint256 tokenId) internal override notPaused {\n\t\tsuper._transfer(from, to, tokenId);\n\t}\n\n\n\tfunction tokenURI(uint256 _tokenId) public view override returns(string memory) {\n\t\tSubData memory data = subData[_tokenId];\n\t\trequire(_exists(_tokenId));\n\t\treturn string(\n\t\t\tabi.encodePacked(\n\t\t\t\tgenerateTokenUriPart1(_tokenId, uint256(data.tier)),\n\t\t\t\tgenerateTokenUriPart2(_getLength(uint8(data.tier)), counter, data.start, data.length)\n\t\t\t)\n\t\t);\n\t}\n}"
      },
      "ERC721Enumerable.sol": {
        "content": "// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts v4.4.1 (token/ERC721/extensions/ERC721Enumerable.sol)\n\npragma solidity ^0.8.0;\n\nimport \"ERC721.sol\";\nimport \"IERC721Enumerable.sol\";\n\n/**\n * @dev This implements an optional extension of {ERC721} defined in the EIP that adds\n * enumerability of all the token ids in the contract as well as all token ids owned by each\n * account.\n */\nabstract contract ERC721Enumerable is ERC721, IERC721Enumerable {\n    // Mapping from owner to list of owned token IDs\n    mapping(address => mapping(uint256 => uint256)) private _ownedTokens;\n\n    // Mapping from token ID to index of the owner tokens list\n    mapping(uint256 => uint256) private _ownedTokensIndex;\n\n    // Array with all token ids, used for enumeration\n    uint256[] private _allTokens;\n\n    // Mapping from token id to position in the allTokens array\n    mapping(uint256 => uint256) private _allTokensIndex;\n\n    /**\n     * @dev See {IERC165-supportsInterface}.\n     */\n    function supportsInterface(bytes4 interfaceId) public view virtual override(IERC165, ERC721) returns (bool) {\n        return interfaceId == type(IERC721Enumerable).interfaceId || super.supportsInterface(interfaceId);\n    }\n\n    /**\n     * @dev See {IERC721Enumerable-tokenOfOwnerByIndex}.\n     */\n    function tokenOfOwnerByIndex(address owner, uint256 index) public view virtual override returns (uint256) {\n        require(index < ERC721.balanceOf(owner), \"ERC721Enumerable: owner index out of bounds\");\n        return _ownedTokens[owner][index];\n    }\n\n    /**\n     * @dev See {IERC721Enumerable-totalSupply}.\n     */\n    function totalSupply() public view virtual override returns (uint256) {\n        return _allTokens.length;\n    }\n\n    /**\n     * @dev See {IERC721Enumerable-tokenByIndex}.\n     */\n    function tokenByIndex(uint256 index) public view virtual override returns (uint256) {\n        require(index < ERC721Enumerable.totalSupply(), \"ERC721Enumerable: global index out of bounds\");\n        return _allTokens[index];\n    }\n\n    /**\n     * @dev Hook that is called before any token transfer. This includes minting\n     * and burning.\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     * - When `to` is zero, ``from``'s `tokenId` will be burned.\n     * - `from` cannot be the zero address.\n     * - `to` cannot be the zero address.\n     *\n     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].\n     */\n    function _beforeTokenTransfer(\n        address from,\n        address to,\n        uint256 tokenId\n    ) internal virtual override {\n        super._beforeTokenTransfer(from, to, tokenId);\n\n        if (from == address(0)) {\n            _addTokenToAllTokensEnumeration(tokenId);\n        } else if (from != to) {\n            _removeTokenFromOwnerEnumeration(from, tokenId);\n        }\n        if (to == address(0)) {\n            _removeTokenFromAllTokensEnumeration(tokenId);\n        } else if (to != from) {\n            _addTokenToOwnerEnumeration(to, tokenId);\n        }\n    }\n\n    /**\n     * @dev Private function to add a token to this extension's ownership-tracking data structures.\n     * @param to address representing the new owner of the given token ID\n     * @param tokenId uint256 ID of the token to be added to the tokens list of the given address\n     */\n    function _addTokenToOwnerEnumeration(address to, uint256 tokenId) private {\n        uint256 length = ERC721.balanceOf(to);\n        _ownedTokens[to][length] = tokenId;\n        _ownedTokensIndex[tokenId] = length;\n    }\n\n    /**\n     * @dev Private function to add a token to this extension's token tracking data structures.\n     * @param tokenId uint256 ID of the token to be added to the tokens list\n     */\n    function _addTokenToAllTokensEnumeration(uint256 tokenId) private {\n        _allTokensIndex[tokenId] = _allTokens.length;\n        _allTokens.push(tokenId);\n    }\n\n    /**\n     * @dev Private function to remove a token from this extension's ownership-tracking data structures. Note that\n     * while the token is not assigned a new owner, the `_ownedTokensIndex` mapping is _not_ updated: this allows for\n     * gas optimizations e.g. when performing a transfer operation (avoiding double writes).\n     * This has O(1) time complexity, but alters the order of the _ownedTokens array.\n     * @param from address representing the previous owner of the given token ID\n     * @param tokenId uint256 ID of the token to be removed from the tokens list of the given address\n     */\n    function _removeTokenFromOwnerEnumeration(address from, uint256 tokenId) private {\n        // To prevent a gap in from's tokens array, we store the last token in the index of the token to delete, and\n        // then delete the last slot (swap and pop).\n\n        uint256 lastTokenIndex = ERC721.balanceOf(from) - 1;\n        uint256 tokenIndex = _ownedTokensIndex[tokenId];\n\n        // When the token to delete is the last token, the swap operation is unnecessary\n        if (tokenIndex != lastTokenIndex) {\n            uint256 lastTokenId = _ownedTokens[from][lastTokenIndex];\n\n            _ownedTokens[from][tokenIndex] = lastTokenId; // Move the last token to the slot of the to-delete token\n            _ownedTokensIndex[lastTokenId] = tokenIndex; // Update the moved token's index\n        }\n\n        // This also deletes the contents at the last position of the array\n        delete _ownedTokensIndex[tokenId];\n        delete _ownedTokens[from][lastTokenIndex];\n    }\n\n    /**\n     * @dev Private function to remove a token from this extension's token tracking data structures.\n     * This has O(1) time complexity, but alters the order of the _allTokens array.\n     * @param tokenId uint256 ID of the token to be removed from the tokens list\n     */\n    function _removeTokenFromAllTokensEnumeration(uint256 tokenId) private {\n        // To prevent a gap in the tokens array, we store the last token in the index of the token to delete, and\n        // then delete the last slot (swap and pop).\n\n        uint256 lastTokenIndex = _allTokens.length - 1;\n        uint256 tokenIndex = _allTokensIndex[tokenId];\n\n        // When the token to delete is the last token, the swap operation is unnecessary. However, since this occurs so\n        // rarely (when the last minted token is burnt) that we still do the swap here to avoid the gas cost of adding\n        // an 'if' statement (like in _removeTokenFromOwnerEnumeration)\n        uint256 lastTokenId = _allTokens[lastTokenIndex];\n\n        _allTokens[tokenIndex] = lastTokenId; // Move the last token to the slot of the to-delete token\n        _allTokensIndex[lastTokenId] = tokenIndex; // Update the moved token's index\n\n        // This also deletes the contents at the last position of the array\n        delete _allTokensIndex[tokenId];\n        _allTokens.pop();\n    }\n}\n"
      },
      "ERC721.sol": {
        "content": "// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC721/ERC721.sol)\n\npragma solidity ^0.8.0;\n\nimport \"IERC721.sol\";\nimport \"IERC721Receiver.sol\";\nimport \"IERC721Metadata.sol\";\nimport \"Address.sol\";\nimport \"Context.sol\";\nimport \"Strings.sol\";\nimport \"ERC165.sol\";\n\n/**\n * @dev Implementation of https://eips.ethereum.org/EIPS/eip-721[ERC721] Non-Fungible Token Standard, including\n * the Metadata extension, but not including the Enumerable extension, which is available separately as\n * {ERC721Enumerable}.\n */\ncontract ERC721 is Context, ERC165, IERC721, IERC721Metadata {\n    using Address for address;\n    using Strings for uint256;\n\n    // Token name\n    string internal _name;\n\n    // Token symbol\n    string internal _symbol;\n\n    // Mapping from token ID to owner address\n    mapping(uint256 => address) private _owners;\n\n    // Mapping owner address to token count\n    mapping(address => uint256) private _balances;\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 Initializes the contract by setting a `name` and a `symbol` to the token collection.\n     */\n    constructor(string memory name_, string memory symbol_) {\n        _name = name_;\n        _symbol = symbol_;\n    }\n\n    /**\n     * @dev See {IERC165-supportsInterface}.\n     */\n    function supportsInterface(bytes4 interfaceId) public view virtual override(ERC165, IERC165) returns (bool) {\n        return\n            interfaceId == type(IERC721).interfaceId ||\n            interfaceId == type(IERC721Metadata).interfaceId ||\n            super.supportsInterface(interfaceId);\n    }\n\n    /**\n     * @dev See {IERC721-balanceOf}.\n     */\n    function balanceOf(address owner) public view virtual override returns (uint256) {\n        require(owner != address(0), \"ERC721: balance query for the zero address\");\n        return _balances[owner];\n    }\n\n    /**\n     * @dev See {IERC721-ownerOf}.\n     */\n    function ownerOf(uint256 tokenId) public view virtual override returns (address) {\n        address owner = _owners[tokenId];\n        require(owner != address(0), \"ERC721: owner query for nonexistent token\");\n        return owner;\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) public view virtual override returns (string memory) {\n        require(_exists(tokenId), \"ERC721Metadata: URI query for nonexistent token\");\n\n        string memory baseURI = _baseURI();\n        return bytes(baseURI).length > 0 ? string(abi.encodePacked(baseURI, tokenId.toString())) : \"\";\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 overridden 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 virtual override {\n        address owner = ERC721.ownerOf(tokenId);\n        require(to != owner, \"ERC721: approval to current owner\");\n\n        require(\n            _msgSender() == owner || isApprovedForAll(owner, _msgSender()),\n            \"ERC721: approve caller is not owner nor approved for all\"\n        );\n\n        _approve(to, tokenId);\n    }\n\n    /**\n     * @dev See {IERC721-getApproved}.\n     */\n    function getApproved(uint256 tokenId) public view virtual override returns (address) {\n        require(_exists(tokenId), \"ERC721: 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 virtual override {\n        _setApprovalForAll(_msgSender(), operator, approved);\n    }\n\n    /**\n     * @dev See {IERC721-isApprovedForAll}.\n     */\n    function isApprovedForAll(address owner, address operator) public view virtual override returns (bool) {\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 virtual override {\n        //solhint-disable-next-line max-line-length\n        require(_isApprovedOrOwner(_msgSender(), tokenId), \"ERC721: transfer caller is not owner nor approved\");\n\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 virtual 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 virtual override {\n        require(_isApprovedOrOwner(_msgSender(), tokenId), \"ERC721: transfer caller is not owner nor approved\");\n        _safeTransfer(from, to, tokenId, _data);\n    }\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     * `_data` is additional data, it has no specified format and it is sent in call to `to`.\n     *\n     * This internal function is equivalent to {safeTransferFrom}, and can be used to e.g.\n     * implement alternative mechanisms to perform token transfer, such as signature-based.\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 `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 _safeTransfer(\n        address from,\n        address to,\n        uint256 tokenId,\n        bytes memory _data\n    ) internal virtual {\n        _transfer(from, to, tokenId);\n        require(_checkOnERC721Received(from, to, tokenId, _data), \"ERC721: transfer to non ERC721Receiver implementer\");\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     * and stop existing when they are burned (`_burn`).\n     */\n    function _exists(uint256 tokenId) internal view virtual returns (bool) {\n        return _owners[tokenId] != address(0);\n    }\n\n    /**\n     * @dev Returns whether `spender` is allowed to manage `tokenId`.\n     *\n     * Requirements:\n     *\n     * - `tokenId` must exist.\n     */\n    function _isApprovedOrOwner(address spender, uint256 tokenId) internal view virtual returns (bool) {\n        require(_exists(tokenId), \"ERC721: operator query for nonexistent token\");\n        address owner = ERC721.ownerOf(tokenId);\n        return (spender == owner || isApprovedForAll(owner, spender) || getApproved(tokenId) == spender);\n    }\n\n    /**\n     * @dev Safely mints `tokenId` and transfers it to `to`.\n     *\n     * Requirements:\n     *\n     * - `tokenId` must not exist.\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 _safeMint(address to, uint256 tokenId) internal virtual {\n        _safeMint(to, tokenId, \"\");\n    }\n\n    /**\n     * @dev Same as {xref-ERC721-_safeMint-address-uint256-}[`_safeMint`], with an additional `data` parameter which is\n     * forwarded in {IERC721Receiver-onERC721Received} to contract recipients.\n     */\n    function _safeMint(\n        address to,\n        uint256 tokenId,\n        bytes memory _data\n    ) internal virtual {\n        _mint(to, tokenId);\n        require(\n            _checkOnERC721Received(address(0), to, tokenId, _data),\n            \"ERC721: transfer to non ERC721Receiver implementer\"\n        );\n    }\n\n    /**\n     * @dev Mints `tokenId` and transfers it to `to`.\n     *\n     * WARNING: Usage of this method is discouraged, use {_safeMint} whenever possible\n     *\n     * Requirements:\n     *\n     * - `tokenId` must not exist.\n     * - `to` cannot be the zero address.\n     *\n     * Emits a {Transfer} event.\n     */\n    function _mint(address to, uint256 tokenId) internal virtual {\n        require(to != address(0), \"ERC721: mint to the zero address\");\n        require(!_exists(tokenId), \"ERC721: token already minted\");\n\n        _beforeTokenTransfer(address(0), to, tokenId);\n\n        _balances[to] += 1;\n        _owners[tokenId] = to;\n\n        emit Transfer(address(0), to, tokenId);\n\n        _afterTokenTransfer(address(0), to, tokenId);\n    }\n\n    /**\n     * @dev Destroys `tokenId`.\n     * The approval is cleared when the token is burned.\n     *\n     * Requirements:\n     *\n     * - `tokenId` must exist.\n     *\n     * Emits a {Transfer} event.\n     */\n    function _burn(uint256 tokenId) internal virtual {\n        address owner = ERC721.ownerOf(tokenId);\n\n        _beforeTokenTransfer(owner, address(0), tokenId);\n\n        // Clear approvals\n        _approve(address(0), tokenId);\n\n        _balances[owner] -= 1;\n        delete _owners[tokenId];\n\n        emit Transfer(owner, address(0), tokenId);\n\n        _afterTokenTransfer(owner, address(0), tokenId);\n    }\n\n    /**\n     * @dev Transfers `tokenId` from `from` to `to`.\n     *  As opposed to {transferFrom}, this imposes no restrictions on msg.sender.\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    ) internal virtual {\n        require(ERC721.ownerOf(tokenId) == from, \"ERC721: transfer from incorrect owner\");\n        require(to != address(0), \"ERC721: transfer to the zero address\");\n\n        _beforeTokenTransfer(from, to, tokenId);\n\n        // Clear approvals from the previous owner\n        _approve(address(0), tokenId);\n\n        _balances[from] -= 1;\n        _balances[to] += 1;\n        _owners[tokenId] = to;\n\n        emit Transfer(from, to, tokenId);\n\n        _afterTokenTransfer(from, to, tokenId);\n    }\n\n    /**\n     * @dev Approve `to` to operate on `tokenId`\n     *\n     * Emits a {Approval} event.\n     */\n    function _approve(address to, uint256 tokenId) internal virtual {\n        _tokenApprovals[tokenId] = to;\n        emit Approval(ERC721.ownerOf(tokenId), to, tokenId);\n    }\n\n    /**\n     * @dev Approve `operator` to operate on all of `owner` tokens\n     *\n     * Emits a {ApprovalForAll} event.\n     */\n    function _setApprovalForAll(\n        address owner,\n        address operator,\n        bool approved\n    ) internal virtual {\n        require(owner != operator, \"ERC721: approve to caller\");\n        _operatorApprovals[owner][operator] = approved;\n        emit ApprovalForAll(owner, operator, approved);\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 IERC721Receiver(to).onERC721Received(_msgSender(), from, tokenId, _data) returns (bytes4 retval) {\n                return retval == IERC721Receiver.onERC721Received.selector;\n            } catch (bytes memory reason) {\n                if (reason.length == 0) {\n                    revert(\"ERC721: 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 any token transfer. This includes minting\n     * and burning.\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     * - When `to` is zero, ``from``'s `tokenId` will be burned.\n     * - `from` and `to` are never both zero.\n     *\n     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].\n     */\n    function _beforeTokenTransfer(\n        address from,\n        address to,\n        uint256 tokenId\n    ) internal virtual {}\n\n    /**\n     * @dev Hook that is called after any transfer of tokens. This includes\n     * minting and burning.\n     *\n     * Calling conditions:\n     *\n     * - when `from` and `to` are both non-zero.\n     * - `from` and `to` are never both zero.\n     *\n     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].\n     */\n    function _afterTokenTransfer(\n        address from,\n        address to,\n        uint256 tokenId\n    ) internal virtual {}\n}\n"
      },
      "IERC721.sol": {
        "content": "// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC721/IERC721.sol)\n\npragma solidity ^0.8.0;\n\nimport \"IERC165.sol\";\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(address indexed from, address indexed to, uint256 indexed tokenId);\n\n    /**\n     * @dev Emitted when `owner` enables `approved` to manage the `tokenId` token.\n     */\n    event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId);\n\n    /**\n     * @dev Emitted when `owner` enables or disables (`approved`) `operator` to manage all of its assets.\n     */\n    event ApprovalForAll(address indexed owner, address indexed operator, bool approved);\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`.\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     * @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 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 the account approved for `tokenId` token.\n     *\n     * Requirements:\n     *\n     * - `tokenId` must exist.\n     */\n    function getApproved(uint256 tokenId) external view returns (address operator);\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) external view returns (bool);\n}\n"
      },
      "IERC721Receiver.sol": {
        "content": "// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts (last updated v4.6.0) (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 `IERC721Receiver.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"
      },
      "IERC721Metadata.sol": {
        "content": "// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts v4.4.1 (token/ERC721/extensions/IERC721Metadata.sol)\n\npragma solidity ^0.8.0;\n\nimport \"IERC721.sol\";\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"
      },
      "Address.sol": {
        "content": "// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts (last updated v4.5.0) (utils/Address.sol)\n\npragma solidity ^0.8.1;\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     * [IMPORTANT]\n     * ====\n     * You shouldn't rely on `isContract` to protect against flash loan attacks!\n     *\n     * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets\n     * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract\n     * constructor.\n     * ====\n     */\n    function isContract(address account) internal view returns (bool) {\n        // This method relies on extcodesize/address.code.length, which returns 0\n        // for contracts in construction, since the code is only stored at the end\n        // of the constructor execution.\n\n        return account.code.length > 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(address(this).balance >= amount, \"Address: insufficient balance\");\n\n        (bool success, ) = recipient.call{value: amount}(\"\");\n        require(success, \"Address: unable to send value, recipient may have reverted\");\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) internal returns (bytes memory) {\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 functionCallWithValue(target, data, value, \"Address: low-level call with value failed\");\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(address(this).balance >= value, \"Address: insufficient balance for call\");\n        require(isContract(target), \"Address: call to non-contract\");\n\n        (bool success, bytes memory returndata) = target.call{value: value}(data);\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) internal view returns (bytes memory) {\n        return functionStaticCall(target, data, \"Address: low-level static call failed\");\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) internal returns (bytes memory) {\n        return functionDelegateCall(target, data, \"Address: low-level delegate call failed\");\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"
      },
      "Context.sol": {
        "content": "// SPDX-License-Identifier: MIT\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"
      },
      "Strings.sol": {
        "content": "// SPDX-License-Identifier: MIT\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) internal pure returns (string memory) {\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"
      },
      "ERC165.sol": {
        "content": "// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts v4.4.1 (utils/introspection/ERC165.sol)\n\npragma solidity ^0.8.0;\n\nimport \"IERC165.sol\";\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) public view virtual override returns (bool) {\n        return interfaceId == type(IERC165).interfaceId;\n    }\n}\n"
      },
      "IERC721Enumerable.sol": {
        "content": "// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts (last updated v4.5.0) (token/ERC721/extensions/IERC721Enumerable.sol)\n\npragma solidity ^0.8.0;\n\nimport \"IERC721.sol\";\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) external view returns (uint256);\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"
      },
      "Ownable.sol": {
        "content": "// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts v4.4.1 (access/Ownable.sol)\n\npragma solidity ^0.8.0;\n\nimport \"Context.sol\";\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 internal _owner;\n\n    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);\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(), \"Ownable: caller is 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(newOwner != address(0), \"Ownable: new owner is the zero address\");\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"
      },
      "SubJsonParser.sol": {
        "content": "// SPDX-License-Identifier: UNLICENSED\npragma solidity ^0.8.2;\n\ncontract SubJsonParser {\n\n\tfunction generateTokenUriPart1(uint256 _tokenId, uint256 _tier) public pure returns(string memory) {\n\t\treturn string(\n\t\t\tabi.encodePacked(\n\t\t\t\tbytes('data:application/json;utf8,{\"name\":\"'),\n\t\t\t\t_getName(_tokenId, _tier),\n\t\t\t\tbytes('\",\"description\":\"'),\n\t\t\t\t\"NFTBox subscription that guarantees the reception of a monthly box until it expires.\",\n\t\t\t\tbytes('\",\"external_url\":\"'),\n\t\t\t\t_getExternalUrl()\n\t\t\t)\n\t\t);\n\t}\n\n\tfunction generateTokenUriPart2(uint256 _tier, uint256 _counter, uint256 _start, uint256 _length) public pure returns(string memory) {\n\t\treturn string(\n\t\t\tabi.encodePacked(\n\t\t\t\tbytes('\",\"attributes\":['),\n\t\t\t\t_tierSub(_tier),\n\t\t\t\t_expiry(_length <= (_counter - _start) ? 0 : (_length - (_counter - _start))),\n\t\t\t\tbytes(',\"image\":\"'),\n\t\t\t\t_getImageCache(_tier),\n\t\t\t\tbytes('\"}')\n\t\t\t)\n\t\t);\n\t}\n\n\tfunction _getImageCache(uint256 _tier) internal pure returns(string memory) {\n\t\tif (_tier == 3)\n\t\t\treturn string(abi.encodePacked(\"https://ipfs.io/ipfs/QmV3GaTzqLvGSRTAuiLQGsBUDDx4Dr7G7gxqtR8eRhudLL\"));\n\t\tif (_tier == 6)\n\t\t\treturn string(abi.encodePacked(\"https://ipfs.io/ipfs/QmZBtFNpbrstaKwSDzsB3uFGMeN7b5VjT93Udab2EbB2tQ\"));\n\t\tif (_tier == 9)\n\t\t\treturn string(abi.encodePacked(\"https://ipfs.io/ipfs/QmPCv1DEWH6pTXXVVdR3nqcavT1bzNRY5QoyR6KEzVjUkb\"));\n\t\treturn string(abi.encodePacked(\"\"));\n\t}\n\n\tfunction _getName(uint256 _tokenId, uint256 _tier) internal pure returns(string memory) {\n\t\treturn string(abi.encodePacked(\"NFTBox \", _tierName(_tier), \" Subscription\"));\n\t}\n\n\tfunction _tierSub(uint256 _tier) internal pure returns(string memory) {\n\t\treturn string(abi.encodePacked(bytes('{\"trait_type\": \"Tier\",\"value\":\"'), _tierName(_tier), bytes('\"},')));\n\t}\n\n\tfunction _tierName(uint256 _tier) internal pure returns(string memory) {\n\t\tif (_tier == 0)\n\t\t\treturn string(abi.encodePacked(\"Bronze\"));\n\t\tif (_tier == 1)\n\t\t\treturn string(abi.encodePacked(\"Silver\"));\n\t\tif (_tier == 2)\n\t\t\treturn string(abi.encodePacked(\"Gold\"));\n\t\tif (_tier == 3)\n\t\t\treturn string(abi.encodePacked(\"Bronze\"));\n\t\tif (_tier == 6)\n\t\t\treturn string(abi.encodePacked(\"Silver\"));\n\t\tif (_tier == 9)\n\t\t\treturn string(abi.encodePacked(\"Gold\"));\n\t}\n\n\tfunction _expiry(uint256 _expirationCount) internal pure returns(string memory) {\n\t\treturn string(abi.encodePacked(bytes('{\"trait_type\": \"Boxes left\",\"value\":\"'), _uint2str(_expirationCount), bytes('\"}]')));\n\t}\n\n\tfunction _getImageCache(string memory _hash) internal pure returns(string memory) {\n\t\treturn string(abi.encodePacked(\"https://ipfs.io/ipfs/\", _hash));\n\t}\n\n\tfunction _getExternalUrl() internal pure returns(string memory) {\n\t\treturn string(abi.encodePacked(\"https://www.nftboxes.io/\"));\n\t}\n\n\tfunction _uint2str(uint _i) internal pure returns (string memory _uintAsString) {\n\t\tif (_i == 0) {\n\t\t\treturn \"0\";\n\t\t}\n\t\tuint j = _i;\n\t\tuint len;\n\t\twhile (j != 0) {\n\t\t\tlen++;\n\t\t\tj /= 10;\n\t\t}\n\t\tbytes memory bstr = new bytes(len);\n\t\tuint k = len;\n\t\twhile (_i != 0) {\n\t\t\tk = k-1;\n\t\t\tuint8 temp = (48 + uint8(_i - _i / 10 * 10));\n\t\t\tbytes1 b1 = bytes1(temp);\n\t\t\tbstr[k] = b1;\n\t\t\t_i /= 10;\n\t\t}\n\t\treturn string(bstr);\n\t}\n}"
      },
      "BoxJsonParser.sol": {
        "content": "// SPDX-License-Identifier: UNLICENSED\npragma solidity ^0.8.2;\n\ncontract BoxJsonParser {\n\n\tfunction generateTokenUriPart1(uint256 _tokenId, string memory _series, string memory _name, string memory _theme) public pure returns(string memory) {\n\t\treturn string(\n\t\t\tabi.encodePacked(\n\t\t\t\tbytes('data:application/json;utf8,{\"name\":\"'),\n\t\t\t\t_getName(_name, _tokenId),\n\t\t\t\tbytes('\",\"description\":\"'),\n\t\t\t\t\"NFTBoxes are a curated monthly box of NFTs on the newest gold standard of NFT technology.\"\n\t\t\t)\n\t\t);\n\t}\n\n\tfunction generateTokenUriPart2(uint256 _boxId, uint256 _tokenId, uint256 _max, string memory _series, string memory _hash, string memory _theme) public pure returns(string memory) {\n\t\treturn string(\n\t\t\tabi.encodePacked(\n\t\t\t\tbytes('\",\"attributes\":['),\n\t\t\t\t_traitBoxId(_boxId),\n\t\t\t\t_traitBoxSeries(_series),\n\t\t\t\t_traitBoxTheme(_theme),\n\t\t\t\t_traitBoxEdition(_tokenId, _max),\n\t\t\t\tbytes(',\"image\":\"'),\n\t\t\t\t_getImageCache(_hash),bytes('\"}')\n\t\t\t)\n\t\t);\n\t}\n\n\tfunction _traitBoxId(uint256 _boxId) internal pure returns(string memory) {\n\t\treturn string(abi.encodePacked(bytes('{\"trait_type\": \"box id\",\"value\":\"'), _uint2str(_boxId), bytes('\"},')));\n\t}\n\n\tfunction _traitBoxSeries(string memory _series) internal pure returns(string memory) {\n\t\treturn string(abi.encodePacked(bytes('{\"trait_type\": \"box series\",\"value\":\"'), _series, bytes('\"},')));\n\t}\n\n\tfunction _traitBoxTheme(string memory _theme) internal pure returns(string memory) {\n\t\treturn string(abi.encodePacked(bytes('{\"trait_type\": \"box theme\",\"value\":\"'), _theme, bytes('\"},')));\n\t}\n\n\tfunction _traitBoxEdition(uint256 _tokenId, uint256 _maxEdition) internal pure returns(string memory) {\n\t\treturn string(abi.encodePacked(bytes('{\"trait_type\": \"box edition\",\"value\":\"'), _uint2str(_tokenId), bytes(' of '), _uint2str(_maxEdition), bytes('\"}]')));\n\t}\n\n\tfunction _getName(string memory _name, uint256 _tokenId) internal pure returns(string memory) {\n\t\treturn string(abi.encodePacked(_name, \" #\", _uint2str(_tokenId)));\n\t}\n\n\tfunction _getImageCache(string memory _hash) internal pure returns(string memory) {\n\t\treturn string(abi.encodePacked(\"https://ipfs.io/ipfs/\", _hash));\n\t}\n\n\tfunction _uint2str(uint _i) internal pure returns (string memory _uintAsString) {\n\t\tif (_i == 0) {\n\t\t\treturn \"0\";\n\t\t}\n\t\tuint j = _i;\n\t\tuint len;\n\t\twhile (j != 0) {\n\t\t\tlen++;\n\t\t\tj /= 10;\n\t\t}\n\t\tbytes memory bstr = new bytes(len);\n\t\tuint k = len;\n\t\twhile (_i != 0) {\n\t\t\tk = k-1;\n\t\t\tuint8 temp = (48 + uint8(_i - _i / 10 * 10));\n\t\t\tbytes1 b1 = bytes1(temp);\n\t\t\tbstr[k] = b1;\n\t\t\t_i /= 10;\n\t\t}\n\t\treturn string(bstr);\n\t}\n}"
      },
      "DefaultOperatorFiltererUpgradeable.sol": {
        "content": "// SPDX-License-Identifier: MIT\npragma solidity ^0.8.13;\n\nimport {OperatorFiltererUpgradeable} from \"OperatorFiltererUpgradeable.sol\";\nimport {CANONICAL_CORI_SUBSCRIPTION} from \"Constants.sol\";\n\n/**\n * @title  DefaultOperatorFiltererUpgradeable\n * @notice Inherits from OperatorFiltererUpgradeable and automatically subscribes to the default OpenSea subscription\n *         when the init function is called.\n */\nabstract contract DefaultOperatorFiltererUpgradeable is OperatorFiltererUpgradeable {\n    /// @dev The upgradeable initialize function that should be called when the contract is being deployed.\n    function __DefaultOperatorFilterer_init() internal onlyInitializing {\n        OperatorFiltererUpgradeable.__OperatorFilterer_init(CANONICAL_CORI_SUBSCRIPTION, true);\n    }\n}\n"
      },
      "OperatorFiltererUpgradeable.sol": {
        "content": "// SPDX-License-Identifier: MIT\npragma solidity ^0.8.13;\n\nimport {IOperatorFilterRegistry} from \"IOperatorFilterRegistry.sol\";\nimport {Initializable} from \"Initializable.sol\";\n\n/**\n * @title  OperatorFiltererUpgradeable\n * @notice Abstract contract whose constructor automatically registers and optionally subscribes to or copies another\n *         registrant's entries in the OperatorFilterRegistry when the init function is called.\n * @dev    This smart contract is meant to be inherited by token contracts so they can use the following:\n *         - `onlyAllowedOperator` modifier for `transferFrom` and `safeTransferFrom` methods.\n *         - `onlyAllowedOperatorApproval` modifier for `approve` and `setApprovalForAll` methods.\n */\nabstract contract OperatorFiltererUpgradeable is Initializable {\n    /// @notice Emitted when an operator is not allowed.\n    error OperatorNotAllowed(address operator);\n\n    IOperatorFilterRegistry constant OPERATOR_FILTER_REGISTRY =\n        IOperatorFilterRegistry(0x000000000000AAeB6D7670E522A718067333cd4E);\n\n    /// @dev The upgradeable initialize function that should be called when the contract is being upgraded.\n    function __OperatorFilterer_init(address subscriptionOrRegistrantToCopy, bool subscribe)\n        internal\n        onlyInitializing\n    {\n        // If an inheriting token contract is deployed to a network without the registry deployed, the modifier\n        // will not revert, but the contract will need to be registered with the registry once it is deployed in\n        // order for the modifier to filter addresses.\n        if (address(OPERATOR_FILTER_REGISTRY).code.length > 0) {\n            if (!OPERATOR_FILTER_REGISTRY.isRegistered(address(this))) {\n                if (subscribe) {\n                    OPERATOR_FILTER_REGISTRY.registerAndSubscribe(address(this), subscriptionOrRegistrantToCopy);\n                } else {\n                    if (subscriptionOrRegistrantToCopy != address(0)) {\n                        OPERATOR_FILTER_REGISTRY.registerAndCopyEntries(address(this), subscriptionOrRegistrantToCopy);\n                    } else {\n                        OPERATOR_FILTER_REGISTRY.register(address(this));\n                    }\n                }\n            }\n        }\n    }\n\n    /**\n     * @dev A helper modifier to check if the operator is allowed.\n     */\n    modifier onlyAllowedOperator(address from) virtual {\n        // Allow spending tokens from addresses with balance\n        // Note that this still allows listings and marketplaces with escrow to transfer tokens if transferred\n        // from an EOA.\n        if (from != msg.sender) {\n            _checkFilterOperator(msg.sender);\n        }\n        _;\n    }\n\n    /**\n     * @dev A helper modifier to check if the operator approval is allowed.\n     */\n    modifier onlyAllowedOperatorApproval(address operator) virtual {\n        _checkFilterOperator(operator);\n        _;\n    }\n\n    /**\n     * @dev A helper function to check if the operator is allowed.\n     */\n    function _checkFilterOperator(address operator) internal view virtual {\n        // Check registry code length to facilitate testing in environments without a deployed registry.\n        if (address(OPERATOR_FILTER_REGISTRY).code.length > 0) {\n            // under normal circumstances, this function will revert rather than return false, but inheriting or\n            // upgraded contracts may specify their own OperatorFilterRegistry implementations, which may behave\n            // differently\n            if (!OPERATOR_FILTER_REGISTRY.isOperatorAllowed(address(this), operator)) {\n                revert OperatorNotAllowed(operator);\n            }\n        }\n    }\n}\n"
      },
      "IOperatorFilterRegistry.sol": {
        "content": "// SPDX-License-Identifier: MIT\npragma solidity ^0.8.13;\n\ninterface IOperatorFilterRegistry {\n    /**\n     * @notice Returns true if operator is not filtered for a given token, either by address or codeHash. Also returns\n     *         true if supplied registrant address is not registered.\n     */\n    function isOperatorAllowed(address registrant, address operator) external view returns (bool);\n\n    /**\n     * @notice Registers an address with the registry. May be called by address itself or by EIP-173 owner.\n     */\n    function register(address registrant) external;\n\n    /**\n     * @notice Registers an address with the registry and \"subscribes\" to another address's filtered operators and codeHashes.\n     */\n    function registerAndSubscribe(address registrant, address subscription) external;\n\n    /**\n     * @notice Registers an address with the registry and copies the filtered operators and codeHashes from another\n     *         address without subscribing.\n     */\n    function registerAndCopyEntries(address registrant, address registrantToCopy) external;\n\n    /**\n     * @notice Unregisters an address with the registry and removes its subscription. May be called by address itself or by EIP-173 owner.\n     *         Note that this does not remove any filtered addresses or codeHashes.\n     *         Also note that any subscriptions to this registrant will still be active and follow the existing filtered addresses and codehashes.\n     */\n    function unregister(address addr) external;\n\n    /**\n     * @notice Update an operator address for a registered address - when filtered is true, the operator is filtered.\n     */\n    function updateOperator(address registrant, address operator, bool filtered) external;\n\n    /**\n     * @notice Update multiple operators for a registered address - when filtered is true, the operators will be filtered. Reverts on duplicates.\n     */\n    function updateOperators(address registrant, address[] calldata operators, bool filtered) external;\n\n    /**\n     * @notice Update a codeHash for a registered address - when filtered is true, the codeHash is filtered.\n     */\n    function updateCodeHash(address registrant, bytes32 codehash, bool filtered) external;\n\n    /**\n     * @notice Update multiple codeHashes for a registered address - when filtered is true, the codeHashes will be filtered. Reverts on duplicates.\n     */\n    function updateCodeHashes(address registrant, bytes32[] calldata codeHashes, bool filtered) external;\n\n    /**\n     * @notice Subscribe an address to another registrant's filtered operators and codeHashes. Will remove previous\n     *         subscription if present.\n     *         Note that accounts with subscriptions may go on to subscribe to other accounts - in this case,\n     *         subscriptions will not be forwarded. Instead the former subscription's existing entries will still be\n     *         used.\n     */\n    function subscribe(address registrant, address registrantToSubscribe) external;\n\n    /**\n     * @notice Unsubscribe an address from its current subscribed registrant, and optionally copy its filtered operators and codeHashes.\n     */\n    function unsubscribe(address registrant, bool copyExistingEntries) external;\n\n    /**\n     * @notice Get the subscription address of a given registrant, if any.\n     */\n    function subscriptionOf(address addr) external returns (address registrant);\n\n    /**\n     * @notice Get the set of addresses subscribed to a given registrant.\n     *         Note that order is not guaranteed as updates are made.\n     */\n    function subscribers(address registrant) external returns (address[] memory);\n\n    /**\n     * @notice Get the subscriber at a given index in the set of addresses subscribed to a given registrant.\n     *         Note that order is not guaranteed as updates are made.\n     */\n    function subscriberAt(address registrant, uint256 index) external returns (address);\n\n    /**\n     * @notice Copy filtered operators and codeHashes from a different registrantToCopy to addr.\n     */\n    function copyEntriesOf(address registrant, address registrantToCopy) external;\n\n    /**\n     * @notice Returns true if operator is filtered by a given address or its subscription.\n     */\n    function isOperatorFiltered(address registrant, address operator) external returns (bool);\n\n    /**\n     * @notice Returns true if the hash of an address's code is filtered by a given address or its subscription.\n     */\n    function isCodeHashOfFiltered(address registrant, address operatorWithCode) external returns (bool);\n\n    /**\n     * @notice Returns true if a codeHash is filtered by a given address or its subscription.\n     */\n    function isCodeHashFiltered(address registrant, bytes32 codeHash) external returns (bool);\n\n    /**\n     * @notice Returns a list of filtered operators for a given address or its subscription.\n     */\n    function filteredOperators(address addr) external returns (address[] memory);\n\n    /**\n     * @notice Returns the set of filtered codeHashes for a given address or its subscription.\n     *         Note that order is not guaranteed as updates are made.\n     */\n    function filteredCodeHashes(address addr) external returns (bytes32[] memory);\n\n    /**\n     * @notice Returns the filtered operator at the given index of the set of filtered operators for a given address or\n     *         its subscription.\n     *         Note that order is not guaranteed as updates are made.\n     */\n    function filteredOperatorAt(address registrant, uint256 index) external returns (address);\n\n    /**\n     * @notice Returns the filtered codeHash at the given index of the list of filtered codeHashes for a given address or\n     *         its subscription.\n     *         Note that order is not guaranteed as updates are made.\n     */\n    function filteredCodeHashAt(address registrant, uint256 index) external returns (bytes32);\n\n    /**\n     * @notice Returns true if an address has registered\n     */\n    function isRegistered(address addr) external returns (bool);\n\n    /**\n     * @dev Convenience method to compute the code hash of an arbitrary contract\n     */\n    function codeHashOf(address addr) external returns (bytes32);\n}\n"
      },
      "Initializable.sol": {
        "content": "// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts (last updated v4.6.0) (proxy/utils/Initializable.sol)\n\npragma solidity ^0.8.2;\n\nimport \"AddressUpgradeable.sol\";\n\n/**\n * @dev This is a base contract to aid in writing upgradeable contracts, or any kind of contract that will be deployed\n * behind a proxy. Since proxied contracts do not make use of a constructor, it's common to move constructor logic to an\n * external initializer function, usually called `initialize`. It then becomes necessary to protect this initializer\n * function so it can only be called once. The {initializer} modifier provided by this contract will have this effect.\n *\n * The initialization functions use a version number. Once a version number is used, it is consumed and cannot be\n * reused. This mechanism prevents re-execution of each \"step\" but allows the creation of new initialization steps in\n * case an upgrade adds a module that needs to be initialized.\n *\n * For example:\n *\n * [.hljs-theme-light.nopadding]\n * ```\n * contract MyToken is ERC20Upgradeable {\n *     function initialize() initializer public {\n *         __ERC20_init(\"MyToken\", \"MTK\");\n *     }\n * }\n * contract MyTokenV2 is MyToken, ERC20PermitUpgradeable {\n *     function initializeV2() reinitializer(2) public {\n *         __ERC20Permit_init(\"MyToken\");\n *     }\n * }\n * ```\n *\n * TIP: To avoid leaving the proxy in an uninitialized state, the initializer function should be called as early as\n * possible by providing the encoded function call as the `_data` argument to {ERC1967Proxy-constructor}.\n *\n * CAUTION: When used with inheritance, manual care must be taken to not invoke a parent initializer twice, or to ensure\n * that all initializers are idempotent. This is not verified automatically as constructors are by Solidity.\n *\n * [CAUTION]\n * ====\n * Avoid leaving a contract uninitialized.\n *\n * An uninitialized contract can be taken over by an attacker. This applies to both a proxy and its implementation\n * contract, which may impact the proxy. To prevent the implementation contract from being used, you should invoke\n * the {_disableInitializers} function in the constructor to automatically lock it when it is deployed:\n *\n * [.hljs-theme-light.nopadding]\n * ```\n * /// @custom:oz-upgrades-unsafe-allow constructor\n * constructor() {\n *     _disableInitializers();\n * }\n * ```\n * ====\n */\nabstract contract Initializable {\n    /**\n     * @dev Indicates that the contract has been initialized.\n     * @custom:oz-retyped-from bool\n     */\n    uint8 private _initialized;\n\n    /**\n     * @dev Indicates that the contract is in the process of being initialized.\n     */\n    bool private _initializing;\n\n    /**\n     * @dev Triggered when the contract has been initialized or reinitialized.\n     */\n    event Initialized(uint8 version);\n\n    /**\n     * @dev A modifier that defines a protected initializer function that can be invoked at most once. In its scope,\n     * `onlyInitializing` functions can be used to initialize parent contracts. Equivalent to `reinitializer(1)`.\n     */\n    modifier initializer() {\n        bool isTopLevelCall = _setInitializedVersion(1);\n        if (isTopLevelCall) {\n            _initializing = true;\n        }\n        _;\n        if (isTopLevelCall) {\n            _initializing = false;\n            emit Initialized(1);\n        }\n    }\n\n    /**\n     * @dev A modifier that defines a protected reinitializer function that can be invoked at most once, and only if the\n     * contract hasn't been initialized to a greater version before. In its scope, `onlyInitializing` functions can be\n     * used to initialize parent contracts.\n     *\n     * `initializer` is equivalent to `reinitializer(1)`, so a reinitializer may be used after the original\n     * initialization step. This is essential to configure modules that are added through upgrades and that require\n     * initialization.\n     *\n     * Note that versions can jump in increments greater than 1; this implies that if multiple reinitializers coexist in\n     * a contract, executing them in the right order is up to the developer or operator.\n     */\n    modifier reinitializer(uint8 version) {\n        bool isTopLevelCall = _setInitializedVersion(version);\n        if (isTopLevelCall) {\n            _initializing = true;\n        }\n        _;\n        if (isTopLevelCall) {\n            _initializing = false;\n            emit Initialized(version);\n        }\n    }\n\n    /**\n     * @dev Modifier to protect an initialization function so that it can only be invoked by functions with the\n     * {initializer} and {reinitializer} modifiers, directly or indirectly.\n     */\n    modifier onlyInitializing() {\n        require(_initializing, \"Initializable: contract is not initializing\");\n        _;\n    }\n\n    /**\n     * @dev Locks the contract, preventing any future reinitialization. This cannot be part of an initializer call.\n     * Calling this in the constructor of a contract will prevent that contract from being initialized or reinitialized\n     * to any version. It is recommended to use this to lock implementation contracts that are designed to be called\n     * through proxies.\n     */\n    function _disableInitializers() internal virtual {\n        _setInitializedVersion(type(uint8).max);\n    }\n\n    function _setInitializedVersion(uint8 version) private returns (bool) {\n        // If the contract is initializing we ignore whether _initialized is set in order to support multiple\n        // inheritance patterns, but we only do this in the context of a constructor, and for the lowest level\n        // of initializers, because in other contexts the contract may have been reentered.\n        if (_initializing) {\n            require(\n                version == 1 && !AddressUpgradeable.isContract(address(this)),\n                \"Initializable: contract is already initialized\"\n            );\n            return false;\n        } else {\n            require(_initialized < version, \"Initializable: contract is already initialized\");\n            _initialized = version;\n            return true;\n        }\n    }\n}\n"
      },
      "AddressUpgradeable.sol": {
        "content": "// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts (last updated v4.5.0) (utils/Address.sol)\n\npragma solidity ^0.8.1;\n\n/**\n * @dev Collection of functions related to the address type\n */\nlibrary AddressUpgradeable {\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     * [IMPORTANT]\n     * ====\n     * You shouldn't rely on `isContract` to protect against flash loan attacks!\n     *\n     * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets\n     * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract\n     * constructor.\n     * ====\n     */\n    function isContract(address account) internal view returns (bool) {\n        // This method relies on extcodesize/address.code.length, which returns 0\n        // for contracts in construction, since the code is only stored at the end\n        // of the constructor execution.\n\n        return account.code.length > 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(address(this).balance >= amount, \"Address: insufficient balance\");\n\n        (bool success, ) = recipient.call{value: amount}(\"\");\n        require(success, \"Address: unable to send value, recipient may have reverted\");\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) internal returns (bytes memory) {\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 functionCallWithValue(target, data, value, \"Address: low-level call with value failed\");\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(address(this).balance >= value, \"Address: insufficient balance for call\");\n        require(isContract(target), \"Address: call to non-contract\");\n\n        (bool success, bytes memory returndata) = target.call{value: value}(data);\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) internal view returns (bytes memory) {\n        return functionStaticCall(target, data, \"Address: low-level static call failed\");\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 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"
      },
      "Constants.sol": {
        "content": "// SPDX-License-Identifier: MIT\npragma solidity ^0.8.13;\n\naddress constant CANONICAL_OPERATOR_FILTER_REGISTRY_ADDRESS = 0x000000000000AAeB6D7670E522A718067333cd4E;\naddress constant CANONICAL_CORI_SUBSCRIPTION = 0x3cc6CddA760b79bAfa08dF41ECFA224f810dCeB6;\n"
      },
      "ERC721Upgradeable.sol": {
        "content": "// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC721/ERC721.sol)\n\npragma solidity ^0.8.0;\n\nimport \"IERC721Upgradeable.sol\";\nimport \"IERC721ReceiverUpgradeable.sol\";\nimport \"IERC721MetadataUpgradeable.sol\";\nimport \"AddressUpgradeable.sol\";\nimport \"ContextUpgradeable.sol\";\nimport \"StringsUpgradeable.sol\";\nimport \"ERC165Upgradeable.sol\";\nimport \"Initializable.sol\";\n\n/**\n * @dev Implementation of https://eips.ethereum.org/EIPS/eip-721[ERC721] Non-Fungible Token Standard, including\n * the Metadata extension, but not including the Enumerable extension, which is available separately as\n * {ERC721Enumerable}.\n */\ncontract ERC721Upgradeable is Initializable, ContextUpgradeable, ERC165Upgradeable, IERC721Upgradeable, IERC721MetadataUpgradeable {\n    using AddressUpgradeable for address;\n    using StringsUpgradeable for uint256;\n\n    // Token name\n    string private _name;\n\n    // Token symbol\n    string private _symbol;\n\n    // Mapping from token ID to owner address\n    mapping(uint256 => address) private _owners;\n\n    // Mapping owner address to token count\n    mapping(address => uint256) private _balances;\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 Initializes the contract by setting a `name` and a `symbol` to the token collection.\n     */\n    function __ERC721_init(string memory name_, string memory symbol_) internal onlyInitializing {\n        __ERC721_init_unchained(name_, symbol_);\n    }\n\n    function __ERC721_init_unchained(string memory name_, string memory symbol_) internal onlyInitializing {\n        _name = name_;\n        _symbol = symbol_;\n    }\n\n    /**\n     * @dev See {IERC165-supportsInterface}.\n     */\n    function supportsInterface(bytes4 interfaceId) public view virtual override(ERC165Upgradeable, IERC165Upgradeable) returns (bool) {\n        return\n            interfaceId == type(IERC721Upgradeable).interfaceId ||\n            interfaceId == type(IERC721MetadataUpgradeable).interfaceId ||\n            super.supportsInterface(interfaceId);\n    }\n\n    /**\n     * @dev See {IERC721-balanceOf}.\n     */\n    function balanceOf(address owner) public view virtual override returns (uint256) {\n        require(owner != address(0), \"ERC721: balance query for the zero address\");\n        return _balances[owner];\n    }\n\n    /**\n     * @dev See {IERC721-ownerOf}.\n     */\n    function ownerOf(uint256 tokenId) public view virtual override returns (address) {\n        address owner = _owners[tokenId];\n        require(owner != address(0), \"ERC721: owner query for nonexistent token\");\n        return owner;\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) public view virtual override returns (string memory) {\n        require(_exists(tokenId), \"ERC721Metadata: URI query for nonexistent token\");\n\n        string memory baseURI = _baseURI();\n        return bytes(baseURI).length > 0 ? string(abi.encodePacked(baseURI, tokenId.toString())) : \"\";\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 overridden 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 virtual override {\n        address owner = ERC721Upgradeable.ownerOf(tokenId);\n        require(to != owner, \"ERC721: approval to current owner\");\n\n        require(\n            _msgSender() == owner || isApprovedForAll(owner, _msgSender()),\n            \"ERC721: approve caller is not owner nor approved for all\"\n        );\n\n        _approve(to, tokenId);\n    }\n\n    /**\n     * @dev See {IERC721-getApproved}.\n     */\n    function getApproved(uint256 tokenId) public view virtual override returns (address) {\n        require(_exists(tokenId), \"ERC721: 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 virtual override {\n        _setApprovalForAll(_msgSender(), operator, approved);\n    }\n\n    /**\n     * @dev See {IERC721-isApprovedForAll}.\n     */\n    function isApprovedForAll(address owner, address operator) public view virtual override returns (bool) {\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 virtual override {\n        //solhint-disable-next-line max-line-length\n        require(_isApprovedOrOwner(_msgSender(), tokenId), \"ERC721: transfer caller is not owner nor approved\");\n\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 virtual 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 virtual override {\n        require(_isApprovedOrOwner(_msgSender(), tokenId), \"ERC721: transfer caller is not owner nor approved\");\n        _safeTransfer(from, to, tokenId, _data);\n    }\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     * `_data` is additional data, it has no specified format and it is sent in call to `to`.\n     *\n     * This internal function is equivalent to {safeTransferFrom}, and can be used to e.g.\n     * implement alternative mechanisms to perform token transfer, such as signature-based.\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 `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 _safeTransfer(\n        address from,\n        address to,\n        uint256 tokenId,\n        bytes memory _data\n    ) internal virtual {\n        _transfer(from, to, tokenId);\n        require(_checkOnERC721Received(from, to, tokenId, _data), \"ERC721: transfer to non ERC721Receiver implementer\");\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     * and stop existing when they are burned (`_burn`).\n     */\n    function _exists(uint256 tokenId) internal view virtual returns (bool) {\n        return _owners[tokenId] != address(0);\n    }\n\n    /**\n     * @dev Returns whether `spender` is allowed to manage `tokenId`.\n     *\n     * Requirements:\n     *\n     * - `tokenId` must exist.\n     */\n    function _isApprovedOrOwner(address spender, uint256 tokenId) internal view virtual returns (bool) {\n        require(_exists(tokenId), \"ERC721: operator query for nonexistent token\");\n        address owner = ERC721Upgradeable.ownerOf(tokenId);\n        return (spender == owner || isApprovedForAll(owner, spender) || getApproved(tokenId) == spender);\n    }\n\n    /**\n     * @dev Safely mints `tokenId` and transfers it to `to`.\n     *\n     * Requirements:\n     *\n     * - `tokenId` must not exist.\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 _safeMint(address to, uint256 tokenId) internal virtual {\n        _safeMint(to, tokenId, \"\");\n    }\n\n    /**\n     * @dev Same as {xref-ERC721-_safeMint-address-uint256-}[`_safeMint`], with an additional `data` parameter which is\n     * forwarded in {IERC721Receiver-onERC721Received} to contract recipients.\n     */\n    function _safeMint(\n        address to,\n        uint256 tokenId,\n        bytes memory _data\n    ) internal virtual {\n        _mint(to, tokenId);\n        require(\n            _checkOnERC721Received(address(0), to, tokenId, _data),\n            \"ERC721: transfer to non ERC721Receiver implementer\"\n        );\n    }\n\n    /**\n     * @dev Mints `tokenId` and transfers it to `to`.\n     *\n     * WARNING: Usage of this method is discouraged, use {_safeMint} whenever possible\n     *\n     * Requirements:\n     *\n     * - `tokenId` must not exist.\n     * - `to` cannot be the zero address.\n     *\n     * Emits a {Transfer} event.\n     */\n    function _mint(address to, uint256 tokenId) internal virtual {\n        require(to != address(0), \"ERC721: mint to the zero address\");\n        require(!_exists(tokenId), \"ERC721: token already minted\");\n\n        _beforeTokenTransfer(address(0), to, tokenId);\n\n        _balances[to] += 1;\n        _owners[tokenId] = to;\n\n        emit Transfer(address(0), to, tokenId);\n\n        _afterTokenTransfer(address(0), to, tokenId);\n    }\n\n    /**\n     * @dev Destroys `tokenId`.\n     * The approval is cleared when the token is burned.\n     *\n     * Requirements:\n     *\n     * - `tokenId` must exist.\n     *\n     * Emits a {Transfer} event.\n     */\n    function _burn(uint256 tokenId) internal virtual {\n        address owner = ERC721Upgradeable.ownerOf(tokenId);\n\n        _beforeTokenTransfer(owner, address(0), tokenId);\n\n        // Clear approvals\n        _approve(address(0), tokenId);\n\n        _balances[owner] -= 1;\n        delete _owners[tokenId];\n\n        emit Transfer(owner, address(0), tokenId);\n\n        _afterTokenTransfer(owner, address(0), tokenId);\n    }\n\n    /**\n     * @dev Transfers `tokenId` from `from` to `to`.\n     *  As opposed to {transferFrom}, this imposes no restrictions on msg.sender.\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    ) internal virtual {\n        require(ERC721Upgradeable.ownerOf(tokenId) == from, \"ERC721: transfer from incorrect owner\");\n        require(to != address(0), \"ERC721: transfer to the zero address\");\n\n        _beforeTokenTransfer(from, to, tokenId);\n\n        // Clear approvals from the previous owner\n        _approve(address(0), tokenId);\n\n        _balances[from] -= 1;\n        _balances[to] += 1;\n        _owners[tokenId] = to;\n\n        emit Transfer(from, to, tokenId);\n\n        _afterTokenTransfer(from, to, tokenId);\n    }\n\n    /**\n     * @dev Approve `to` to operate on `tokenId`\n     *\n     * Emits a {Approval} event.\n     */\n    function _approve(address to, uint256 tokenId) internal virtual {\n        _tokenApprovals[tokenId] = to;\n        emit Approval(ERC721Upgradeable.ownerOf(tokenId), to, tokenId);\n    }\n\n    /**\n     * @dev Approve `operator` to operate on all of `owner` tokens\n     *\n     * Emits a {ApprovalForAll} event.\n     */\n    function _setApprovalForAll(\n        address owner,\n        address operator,\n        bool approved\n    ) internal virtual {\n        require(owner != operator, \"ERC721: approve to caller\");\n        _operatorApprovals[owner][operator] = approved;\n        emit ApprovalForAll(owner, operator, approved);\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 IERC721ReceiverUpgradeable(to).onERC721Received(_msgSender(), from, tokenId, _data) returns (bytes4 retval) {\n                return retval == IERC721ReceiverUpgradeable.onERC721Received.selector;\n            } catch (bytes memory reason) {\n                if (reason.length == 0) {\n                    revert(\"ERC721: 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 any token transfer. This includes minting\n     * and burning.\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     * - When `to` is zero, ``from``'s `tokenId` will be burned.\n     * - `from` and `to` are never both zero.\n     *\n     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].\n     */\n    function _beforeTokenTransfer(\n        address from,\n        address to,\n        uint256 tokenId\n    ) internal virtual {}\n\n    /**\n     * @dev Hook that is called after any transfer of tokens. This includes\n     * minting and burning.\n     *\n     * Calling conditions:\n     *\n     * - when `from` and `to` are both non-zero.\n     * - `from` and `to` are never both zero.\n     *\n     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].\n     */\n    function _afterTokenTransfer(\n        address from,\n        address to,\n        uint256 tokenId\n    ) internal virtual {}\n\n    /**\n     * @dev This empty reserved space is put in place to allow future versions to add new\n     * variables without shifting down storage in the inheritance chain.\n     * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps\n     */\n    uint256[44] private __gap;\n}\n"
      },
      "IERC721Upgradeable.sol": {
        "content": "// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC721/IERC721.sol)\n\npragma solidity ^0.8.0;\n\nimport \"IERC165Upgradeable.sol\";\n\n/**\n * @dev Required interface of an ERC721 compliant contract.\n */\ninterface IERC721Upgradeable is IERC165Upgradeable {\n    /**\n     * @dev Emitted when `tokenId` token is transferred from `from` to `to`.\n     */\n    event Transfer(address indexed from, address indexed to, uint256 indexed tokenId);\n\n    /**\n     * @dev Emitted when `owner` enables `approved` to manage the `tokenId` token.\n     */\n    event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId);\n\n    /**\n     * @dev Emitted when `owner` enables or disables (`approved`) `operator` to manage all of its assets.\n     */\n    event ApprovalForAll(address indexed owner, address indexed operator, bool approved);\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`.\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     * @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 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 the account approved for `tokenId` token.\n     *\n     * Requirements:\n     *\n     * - `tokenId` must exist.\n     */\n    function getApproved(uint256 tokenId) external view returns (address operator);\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) external view returns (bool);\n}\n"
      },
      "IERC165Upgradeable.sol": {
        "content": "// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts v4.4.1 (utils/introspection/IERC165.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 IERC165Upgradeable {\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"
      },
      "IERC721ReceiverUpgradeable.sol": {
        "content": "// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts (last updated v4.6.0) (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 IERC721ReceiverUpgradeable {\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 `IERC721Receiver.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"
      },
      "IERC721MetadataUpgradeable.sol": {
        "content": "// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts v4.4.1 (token/ERC721/extensions/IERC721Metadata.sol)\n\npragma solidity ^0.8.0;\n\nimport \"IERC721Upgradeable.sol\";\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 IERC721MetadataUpgradeable is IERC721Upgradeable {\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"
      },
      "ContextUpgradeable.sol": {
        "content": "// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)\n\npragma solidity ^0.8.0;\nimport \"Initializable.sol\";\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 ContextUpgradeable is Initializable {\n    function __Context_init() internal onlyInitializing {\n    }\n\n    function __Context_init_unchained() internal onlyInitializing {\n    }\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     * @dev This empty reserved space is put in place to allow future versions to add new\n     * variables without shifting down storage in the inheritance chain.\n     * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps\n     */\n    uint256[50] private __gap;\n}\n"
      },
      "StringsUpgradeable.sol": {
        "content": "// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts v4.4.1 (utils/Strings.sol)\n\npragma solidity ^0.8.0;\n\n/**\n * @dev String operations.\n */\nlibrary StringsUpgradeable {\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) internal pure returns (string memory) {\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"
      },
      "ERC165Upgradeable.sol": {
        "content": "// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts v4.4.1 (utils/introspection/ERC165.sol)\n\npragma solidity ^0.8.0;\n\nimport \"IERC165Upgradeable.sol\";\nimport \"Initializable.sol\";\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 ERC165Upgradeable is Initializable, IERC165Upgradeable {\n    function __ERC165_init() internal onlyInitializing {\n    }\n\n    function __ERC165_init_unchained() internal onlyInitializing {\n    }\n    /**\n     * @dev See {IERC165-supportsInterface}.\n     */\n    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {\n        return interfaceId == type(IERC165Upgradeable).interfaceId;\n    }\n\n    /**\n     * @dev This empty reserved space is put in place to allow future versions to add new\n     * variables without shifting down storage in the inheritance chain.\n     * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps\n     */\n    uint256[50] private __gap;\n}\n"
      },
      "ERC2981Upgradeable.sol": {
        "content": "// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts (last updated v4.6.0) (token/common/ERC2981.sol)\n\npragma solidity ^0.8.0;\n\nimport \"IERC2981Upgradeable.sol\";\nimport \"ERC165Upgradeable.sol\";\nimport \"Initializable.sol\";\n\n/**\n * @dev Implementation of the NFT Royalty Standard, a standardized way to retrieve royalty payment information.\n *\n * Royalty information can be specified globally for all token ids via {_setDefaultRoyalty}, and/or individually for\n * specific token ids via {_setTokenRoyalty}. The latter takes precedence over the first.\n *\n * Royalty is specified as a fraction of sale price. {_feeDenominator} is overridable but defaults to 10000, meaning the\n * fee is specified in basis points by default.\n *\n * IMPORTANT: ERC-2981 only specifies a way to signal royalty information and does not enforce its payment. See\n * https://eips.ethereum.org/EIPS/eip-2981#optional-royalty-payments[Rationale] in the EIP. Marketplaces are expected to\n * voluntarily pay royalties together with sales, but note that this standard is not yet widely supported.\n *\n * _Available since v4.5._\n */\nabstract contract ERC2981Upgradeable is Initializable, IERC2981Upgradeable, ERC165Upgradeable {\n    function __ERC2981_init() internal onlyInitializing {\n    }\n\n    function __ERC2981_init_unchained() internal onlyInitializing {\n    }\n    struct RoyaltyInfo {\n        address receiver;\n        uint96 royaltyFraction;\n    }\n\n    RoyaltyInfo private _defaultRoyaltyInfo;\n    mapping(uint256 => RoyaltyInfo) private _tokenRoyaltyInfo;\n\n    /**\n     * @dev See {IERC165-supportsInterface}.\n     */\n    function supportsInterface(bytes4 interfaceId) public view virtual override(IERC165Upgradeable, ERC165Upgradeable) returns (bool) {\n        return interfaceId == type(IERC2981Upgradeable).interfaceId || super.supportsInterface(interfaceId);\n    }\n\n    /**\n     * @inheritdoc IERC2981Upgradeable\n     */\n    function royaltyInfo(uint256 _tokenId, uint256 _salePrice) public view virtual override returns (address, uint256) {\n        RoyaltyInfo memory royalty = _tokenRoyaltyInfo[_tokenId];\n\n        if (royalty.receiver == address(0)) {\n            royalty = _defaultRoyaltyInfo;\n        }\n\n        uint256 royaltyAmount = (_salePrice * royalty.royaltyFraction) / _feeDenominator();\n\n        return (royalty.receiver, royaltyAmount);\n    }\n\n    /**\n     * @dev The denominator with which to interpret the fee set in {_setTokenRoyalty} and {_setDefaultRoyalty} as a\n     * fraction of the sale price. Defaults to 10000 so fees are expressed in basis points, but may be customized by an\n     * override.\n     */\n    function _feeDenominator() internal pure virtual returns (uint96) {\n        return 10000;\n    }\n\n    /**\n     * @dev Sets the royalty information that all ids in this contract will default to.\n     *\n     * Requirements:\n     *\n     * - `receiver` cannot be the zero address.\n     * - `feeNumerator` cannot be greater than the fee denominator.\n     */\n    function _setDefaultRoyalty(address receiver, uint96 feeNumerator) internal virtual {\n        require(feeNumerator <= _feeDenominator(), \"ERC2981: royalty fee will exceed salePrice\");\n        require(receiver != address(0), \"ERC2981: invalid receiver\");\n\n        _defaultRoyaltyInfo = RoyaltyInfo(receiver, feeNumerator);\n    }\n\n    /**\n     * @dev Removes default royalty information.\n     */\n    function _deleteDefaultRoyalty() internal virtual {\n        delete _defaultRoyaltyInfo;\n    }\n\n    /**\n     * @dev Sets the royalty information for a specific token id, overriding the global default.\n     *\n     * Requirements:\n     *\n     * - `tokenId` must be already minted.\n     * - `receiver` cannot be the zero address.\n     * - `feeNumerator` cannot be greater than the fee denominator.\n     */\n    function _setTokenRoyalty(\n        uint256 tokenId,\n        address receiver,\n        uint96 feeNumerator\n    ) internal virtual {\n        require(feeNumerator <= _feeDenominator(), \"ERC2981: royalty fee will exceed salePrice\");\n        require(receiver != address(0), \"ERC2981: Invalid parameters\");\n\n        _tokenRoyaltyInfo[tokenId] = RoyaltyInfo(receiver, feeNumerator);\n    }\n\n    /**\n     * @dev Resets royalty information for the token id back to the global default.\n     */\n    function _resetTokenRoyalty(uint256 tokenId) internal virtual {\n        delete _tokenRoyaltyInfo[tokenId];\n    }\n\n    /**\n     * @dev This empty reserved space is put in place to allow future versions to add new\n     * variables without shifting down storage in the inheritance chain.\n     * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps\n     */\n    uint256[48] private __gap;\n}\n"
      },
      "IERC2981Upgradeable.sol": {
        "content": "// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts (last updated v4.6.0) (interfaces/IERC2981.sol)\n\npragma solidity ^0.8.0;\n\nimport \"IERC165Upgradeable.sol\";\n\n/**\n * @dev Interface for the NFT Royalty Standard.\n *\n * A standardized way to retrieve royalty payment information for non-fungible tokens (NFTs) to enable universal\n * support for royalty payments across all NFT marketplaces and ecosystem participants.\n *\n * _Available since v4.5._\n */\ninterface IERC2981Upgradeable is IERC165Upgradeable {\n    /**\n     * @dev Returns how much royalty is owed and to whom, based on a sale price that may be denominated in any unit of\n     * exchange. The royalty amount is denominated and should be paid in that same unit of exchange.\n     */\n    function royaltyInfo(uint256 tokenId, uint256 salePrice)\n        external\n        view\n        returns (address receiver, uint256 royaltyAmount);\n}\n"
      },
      "OwnableUpgradeable.sol": {
        "content": "// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts v4.4.1 (access/Ownable.sol)\n\npragma solidity ^0.8.0;\n\nimport \"ContextUpgradeable.sol\";\nimport \"Initializable.sol\";\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 OwnableUpgradeable is Initializable, ContextUpgradeable {\n    address private _owner;\n\n    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);\n\n    /**\n     * @dev Initializes the contract setting the deployer as the initial owner.\n     */\n    function __Ownable_init() internal onlyInitializing {\n        __Ownable_init_unchained();\n    }\n\n    function __Ownable_init_unchained() internal onlyInitializing {\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(), \"Ownable: caller is 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(newOwner != address(0), \"Ownable: new owner is the zero address\");\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     * @dev This empty reserved space is put in place to allow future versions to add new\n     * variables without shifting down storage in the inheritance chain.\n     * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps\n     */\n    uint256[49] private __gap;\n}\n"
      }
    },
    "settings": {
      "evmVersion": "istanbul",
      "optimizer": {
        "enabled": true,
        "runs": 200
      },
      "libraries": {
        "NFTBoxesV2Upgradeable.sol": {}
      },
      "outputSelection": {
        "*": {
          "*": [
            "evm.bytecode",
            "evm.deployedBytecode",
            "devdoc",
            "userdoc",
            "metadata",
            "abi"
          ]
        }
      }
    }
  }}