organized_contracts/23/23090a6eee6657fd764352a64d94ea9619793d1094c7f3d9a12f906374d33f31/contract.json

{
  "language": "Solidity",
  "sources": {
    "contracts/Media.sol": {
      "content": "// SPDX-License-Identifier:MIT\r\npragma solidity ^0.8.7;\r\npragma experimental ABIEncoderV2;\r\n\r\nimport {ERC721Burnable} from \"@openzeppelin/contracts/token/ERC721/extensions/ERC721Burnable.sol\";\r\nimport {ERC721Enumerable} from \"@openzeppelin/contracts/token/ERC721/extensions/ERC721Enumerable.sol\";\r\nimport {ERC721} from \"@openzeppelin/contracts/token/ERC721/ERC721.sol\";\r\nimport {ERC721URIStorage} from \"@openzeppelin/contracts/token/ERC721/extensions/ERC721URIStorage.sol\";\r\nimport {Counters} from \"@openzeppelin/contracts/utils/Counters.sol\";\r\nimport {SafeMath} from \"@openzeppelin/contracts/utils/math/SafeMath.sol\";\r\nimport {Math} from \"@openzeppelin/contracts/utils/math/Math.sol\";\r\nimport {IERC20} from \"@openzeppelin/contracts/token/ERC20/IERC20.sol\";\r\nimport {Ownable} from \"@openzeppelin/contracts/access/Ownable.sol\";\r\nimport {\r\n    ReentrancyGuard\r\n} from \"@openzeppelin/contracts/security/ReentrancyGuard.sol\";\r\nimport {Decimal} from \"./Decimal.sol\";\r\nimport {IMarket} from \"./interfaces/IMarket.sol\";\r\nimport \"./interfaces/IMedia.sol\";\r\n\r\n/**\r\n * @title A media value system, with perpetual equity to creators\r\n * @notice This contract provides an interface to mint media with a market\r\n * owned by the creator.\r\n */\r\ncontract Media is IMedia, ReentrancyGuard, Ownable, ERC721Burnable,  ERC721URIStorage, ERC721Enumerable {\r\n    using Counters for Counters.Counter;\r\n    using SafeMath for uint256;\r\n\r\n    /* *******\r\n     * Globals\r\n     * *******\r\n     */\r\n\r\n    // Address for the market\r\n    address public marketContract;\r\n    address public tokenContract;\r\n\r\n    // Mapping from token to previous owner of the token\r\n    mapping(uint256 => address) public previousTokenOwners;\r\n\r\n    // Mapping from token id to creator address\r\n    mapping(uint256 => address) public tokenCreators;\r\n\r\n    // Mapping from creator address to their (enumerable) set of created tokens\r\n    mapping(address => uint) private _creatorTokens;\r\n\r\n    // Mapping from token id to sha256 hash of content\r\n    mapping(uint256 => bytes32) public tokenContentHashes;\r\n\r\n    // Mapping from token id to sha256 hash of metadata\r\n    mapping(uint256 => bytes32) public tokenMetadataHashes;\r\n\r\n    // Mapping from token id to metadataURI\r\n    mapping(uint256 => string) private _tokenMetadataURIs;\r\n\r\n    // Mapping from contentHash to bool\r\n    mapping(bytes32 => bool) private _contentHashes;\r\n\r\n    //keccak256(\"Permit(address spender,uint256 tokenId,uint256 nonce,uint256 deadline)\");\r\n    bytes32 public constant PERMIT_TYPEHASH =\r\n        0x49ecf333e5b8c95c40fdafc95c1ad136e8914a8fb55e9dc8bb01eaa83a2df9ad;\r\n\r\n    //keccak256(\"MintWithSig(bytes32 contentHash,bytes32 metadataHash,uint256 creatorShare,uint256 nonce,uint256 deadline)\");\r\n    bytes32 public constant MINT_WITH_SIG_TYPEHASH =\r\n        0x2952e482b8e2b192305f87374d7af45dc2eafafe4f50d26a0c02e90f2fdbe14b;\r\n\r\n    // Mapping from address to token id to permit nonce\r\n    mapping(address => mapping(uint256 => uint256)) public permitNonces;\r\n\r\n    // Mapping from address to mint with sig nonce\r\n    mapping(address => uint256) public mintWithSigNonces;\r\n\r\n    /*\r\n     *     bytes4(keccak256('name()')) == 0x06fdde03\r\n     *     bytes4(keccak256('symbol()')) == 0x95d89b41\r\n     *     bytes4(keccak256('tokenURI(uint256)')) == 0xc87b56dd\r\n     *     bytes4(keccak256('tokenMetadataURI(uint256)')) == 0x157c3df9\r\n     *\r\n     *     => 0x06fdde03 ^ 0x95d89b41 ^ 0xc87b56dd ^ 0x157c3df9 == 0x4e222e66\r\n     */\r\n    bytes4 private constant _INTERFACE_ID_ERC721_METADATA = 0x4e222e66;\r\n\r\n    Counters.Counter private _tokenIdTracker;\r\n\r\n    /* *********\r\n     * Modifiers\r\n     * *********\r\n     */\r\n\r\n    /**\r\n     * @notice Require that the token has not been burned and has been minted\r\n     */\r\n    modifier onlyExistingToken(uint256 tokenId) {\r\n        require(_exists(tokenId), \"Media: nonexistent token\");\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @notice Require that the token has had a content hash set\r\n     */\r\n    modifier onlyTokenWithContentHash(uint256 tokenId) {\r\n        require(\r\n            tokenContentHashes[tokenId] != 0,\r\n            \"Media: token does not have hash of created content\"\r\n        );\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @notice Require that the token has had a metadata hash set\r\n     */\r\n    modifier onlyTokenWithMetadataHash(uint256 tokenId) {\r\n        require(\r\n            tokenMetadataHashes[tokenId] != 0,\r\n            \"Media: token does not have hash of its metadata\"\r\n        );\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @notice Ensure that the provided spender is the approved or the owner of\r\n     * the media for the specified tokenId\r\n     */\r\n    modifier onlyApprovedOrOwner(address spender, uint256 tokenId) {\r\n        require(\r\n            _isApprovedOrOwner(spender, tokenId),\r\n            \"Media: Only approved or owner\"\r\n        );\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @notice Ensure the token has been created (even if it has been burned)\r\n     */\r\n    modifier onlyTokenCreated(uint256 tokenId) {\r\n        require(\r\n            _tokenIdTracker.current() > tokenId,\r\n            \"Media: token with that id does not exist\"\r\n        );\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @notice Ensure that the provided URI is not empty\r\n     */\r\n    modifier onlyValidURI(string memory uri) {\r\n        require(\r\n            bytes(uri).length != 0,\r\n            \"Media: specified uri must be non-empty\"\r\n        );\r\n        _;\r\n    }\r\n\r\n    /**\r\n     * @notice On deployment, set the market contract address and register the\r\n     * ERC721 metadata interface\r\n     */\r\n    constructor(address marketContractAddr, address tokenContractAddr) ERC721(\"PLOT\", \"PLOT\") {\r\n        marketContract = marketContractAddr;\r\n        tokenContract  = tokenContractAddr;\r\n    }\r\n\r\n    /* **************\r\n     * View Functions\r\n     * **************\r\n     */\r\n\r\n    /**\r\n     * @notice return the URI for a particular piece of media with the specified tokenId\r\n     * @dev This function is an override of the base OZ implementation because we\r\n     * will return the tokenURI even if the media has been burned. In addition, this\r\n     * protocol does not support a base URI, so relevant conditionals are removed.\r\n     * @return the URI for a token\r\n     */\r\n    function tokenURI(uint256 tokenId)\r\n        public\r\n        view\r\n        override(ERC721, ERC721URIStorage)\r\n        onlyTokenCreated(tokenId)\r\n        returns (string memory)\r\n    {\r\n        return super.tokenURI(tokenId);\r\n    }\r\n\r\n    /**\r\n     * @notice Return the metadata URI for a piece of media given the token URI\r\n     * @return the metadata URI for the token\r\n     */\r\n    function tokenMetadataURI(uint256 tokenId)\r\n        external\r\n        view\r\n        override\r\n        onlyTokenCreated(tokenId)\r\n        returns (string memory)\r\n    {\r\n        return _tokenMetadataURIs[tokenId];\r\n    }\r\n\r\n    /* ****************\r\n     * Public Functions\r\n     * ****************\r\n     */\r\n\r\n    /**\r\n     * @notice see IMedia\r\n     */\r\n    function mint(MediaData memory data, IMarket.BidShares memory bidShares)\r\n        public\r\n        override\r\n        nonReentrant\r\n        onlyOwner\r\n    {\r\n        _mintForCreator(msg.sender, data, bidShares);\r\n    }\r\n\r\n    /**\r\n     * @notice Multiple Mint\r\n     */\r\n    function multiMint(MediaData[] memory _array)\r\n    public \r\n    onlyOwner\r\n    {\r\n        IMarket.BidShares memory bidShares = IMarket.BidShares(\r\n            {\r\n                prevOwner : Decimal.D256(0), \r\n                creator : Decimal.D256( uint256(0).mul(Decimal.BASE)),\r\n                owner : Decimal.D256(uint256(100).mul(Decimal.BASE))\r\n            }\r\n        );\r\n\r\n        for(uint i=0; i<_array.length; i++){\r\n            mint(_array[i], bidShares);\r\n        }\r\n    }\r\n\r\n    /**\r\n     * @notice see IMedia\r\n     */\r\n    function mintWithSig(\r\n        address creator,\r\n        MediaData memory data,\r\n        IMarket.BidShares memory bidShares,\r\n        EIP712Signature memory sig\r\n    ) public override nonReentrant {\r\n        require(\r\n            sig.deadline == 0 || sig.deadline >= block.timestamp,\r\n            \"Media: mintWithSig expired\"\r\n        );\r\n\r\n        bytes32 domainSeparator = _calculateDomainSeparator();\r\n\r\n        bytes32 digest =\r\n            keccak256(\r\n                abi.encodePacked(\r\n                    \"\\x19\\x01\",\r\n                    domainSeparator,\r\n                    keccak256(\r\n                        abi.encode(\r\n                            MINT_WITH_SIG_TYPEHASH,\r\n                            data.contentHash,\r\n                            data.metadataHash,\r\n                            bidShares.creator.value,\r\n                            mintWithSigNonces[creator]++,\r\n                            sig.deadline\r\n                        )\r\n                    )\r\n                )\r\n            );\r\n\r\n        address recoveredAddress = ecrecover(digest, sig.v, sig.r, sig.s);\r\n\r\n        require(\r\n            recoveredAddress != address(0) && creator == recoveredAddress,\r\n            \"Media: Signature invalid\"\r\n        );\r\n\r\n        _mintForCreator(recoveredAddress, data, bidShares);\r\n    }\r\n\r\n    /**\r\n     * @notice see IMedia\r\n     */\r\n    function auctionTransfer(uint256 tokenId, address recipient)\r\n        external\r\n        override\r\n    {\r\n        require(msg.sender == marketContract, \"Media: only market contract\");\r\n        previousTokenOwners[tokenId] = ownerOf(tokenId);\r\n        _safeTransfer(ownerOf(tokenId), recipient, tokenId, \"\");\r\n    }\r\n\r\n    /**\r\n     * @notice see IMedia\r\n     */\r\n    function setAsk(uint256 tokenId, IMarket.Ask memory ask)\r\n        public\r\n        override\r\n        nonReentrant\r\n        onlyApprovedOrOwner(msg.sender, tokenId)\r\n    {\r\n        require(ask.currency == tokenContract, \"Market: Ask currency must be utility token\");\r\n        IMarket(marketContract).setAsk(tokenId, ask);\r\n    }\r\n\r\n    /**\r\n     * @notice see IMedia\r\n     */\r\n    function removeAsk(uint256 tokenId)\r\n        external\r\n        override\r\n        nonReentrant\r\n        onlyApprovedOrOwner(msg.sender, tokenId)\r\n    {\r\n        IMarket(marketContract).removeAsk(tokenId);\r\n    }\r\n\r\n    /**\r\n     * @notice see IMedia\r\n     */\r\n    function setBid(uint256 tokenId, IMarket.Bid memory bid)\r\n        public\r\n        override\r\n        nonReentrant\r\n        onlyExistingToken(tokenId)\r\n    {\r\n        require(msg.sender == bid.bidder, \"Market: Bidder must be msg sender\");\r\n        require(bid.currency == tokenContract, \"Market: Bid currency must be utility token\");\r\n        IMarket(marketContract).setBid(tokenId, bid, msg.sender);\r\n    }\r\n\r\n    /**\r\n     * @notice see IMedia\r\n     */\r\n    function removeBid(uint256 tokenId)\r\n        external\r\n        override\r\n        nonReentrant\r\n        onlyTokenCreated(tokenId)\r\n    {\r\n        IMarket(marketContract).removeBid(tokenId, msg.sender);\r\n    }\r\n\r\n    /**\r\n     * @notice see IMedia\r\n     */\r\n    function acceptBid(uint256 tokenId, IMarket.Bid memory bid)\r\n        public\r\n        override\r\n        nonReentrant\r\n        onlyApprovedOrOwner(msg.sender, tokenId)\r\n    {\r\n        IMarket(marketContract).acceptBid(tokenId, bid);\r\n    }\r\n\r\n    /**\r\n     * @notice Burn a token.\r\n     * @dev Only callable if the media owner is also the creator.\r\n     */\r\n    function burn(uint256 tokenId)\r\n        public\r\n        override\r\n        nonReentrant\r\n        onlyExistingToken(tokenId)\r\n        onlyApprovedOrOwner(msg.sender, tokenId)\r\n    {\r\n        address owner = ownerOf(tokenId);\r\n\r\n        require(\r\n            tokenCreators[tokenId] == owner,\r\n            \"Media: owner is not creator of media\"\r\n        );\r\n\r\n        _burn(tokenId);\r\n    }\r\n\r\n    /**\r\n     * @notice Revoke the approvals for a token. The provided `approve` function is not sufficient\r\n     * for this protocol, as it does not allow an approved address to revoke it's own approval.\r\n     * In instances where a 3rd party is interacting on a user's behalf via `permit`, they should\r\n     * revoke their approval once their task is complete as a best practice.\r\n     */\r\n    function revokeApproval(uint256 tokenId) external override nonReentrant {\r\n        require(\r\n            msg.sender == getApproved(tokenId),\r\n            \"Media: caller not approved address\"\r\n        );\r\n        _approve(address(0), tokenId);\r\n    }\r\n\r\n    /**\r\n     * @notice see IMedia\r\n     * @dev only callable by approved or owner\r\n     */\r\n    function updateTokenURI(uint256 tokenId, string calldata _tokenURI)\r\n        external\r\n        override\r\n        nonReentrant\r\n        onlyApprovedOrOwner(msg.sender, tokenId)\r\n        onlyTokenWithContentHash(tokenId)\r\n        onlyValidURI(_tokenURI)\r\n    {\r\n        _setTokenURI(tokenId, _tokenURI);\r\n        emit TokenURIUpdated(tokenId, msg.sender, _tokenURI);\r\n    }\r\n\r\n    /**\r\n     * @notice see IMedia\r\n     * @dev only callable by approved or owner\r\n     */\r\n    function updateTokenMetadataURI(\r\n        uint256 tokenId,\r\n        string calldata metadataURI\r\n    )\r\n        external\r\n        override\r\n        nonReentrant\r\n        onlyApprovedOrOwner(msg.sender, tokenId)\r\n        onlyTokenWithMetadataHash(tokenId)\r\n        onlyValidURI(metadataURI)\r\n    {\r\n        _setTokenMetadataURI(tokenId, metadataURI);\r\n        emit TokenMetadataURIUpdated(tokenId, msg.sender, metadataURI);\r\n    }\r\n\r\n    /**\r\n     * @notice See IMedia\r\n     * @dev This method is loosely based on the permit for ERC-20 tokens in  EIP-2612, but modified\r\n     * for ERC-721.\r\n     */\r\n    function permit(\r\n        address spender,\r\n        uint256 tokenId,\r\n        EIP712Signature memory sig\r\n    ) public override nonReentrant onlyExistingToken(tokenId) {\r\n        require(\r\n            sig.deadline == 0 || sig.deadline >= block.timestamp,\r\n            \"Media: Permit expired\"\r\n        );\r\n        require(spender != address(0), \"Media: spender cannot be 0x0\");\r\n        bytes32 domainSeparator = _calculateDomainSeparator();\r\n\r\n        bytes32 digest =\r\n            keccak256(\r\n                abi.encodePacked(\r\n                    \"\\x19\\x01\",\r\n                    domainSeparator,\r\n                    keccak256(\r\n                        abi.encode(\r\n                            PERMIT_TYPEHASH,\r\n                            spender,\r\n                            tokenId,\r\n                            permitNonces[ownerOf(tokenId)][tokenId]++,\r\n                            sig.deadline\r\n                        )\r\n                    )\r\n                )\r\n            );\r\n\r\n        address recoveredAddress = ecrecover(digest, sig.v, sig.r, sig.s);\r\n\r\n        require(\r\n            recoveredAddress != address(0) &&\r\n                ownerOf(tokenId) == recoveredAddress,\r\n            \"Media: Signature invalid\"\r\n        );\r\n\r\n        _approve(spender, tokenId);\r\n    }\r\n\r\n    /* *****************\r\n     * Private Functions\r\n     * *****************\r\n     */\r\n\r\n    /**\r\n     * @notice Creates a new token for `creator`. Its token ID will be automatically\r\n     * assigned (and available on the emitted {IERC721-Transfer} event), and the token\r\n     * URI autogenerated based on the base URI passed at construction.\r\n     *\r\n     * See {ERC721-_safeMint}.\r\n     *\r\n     * On mint, also set the sha256 hashes of the content and its metadata for integrity\r\n     * checks, along with the initial URIs to point to the content and metadata. Attribute\r\n     * the token ID to the creator, mark the content hash as used, and set the bid shares for\r\n     * the media's market.\r\n     *\r\n     * Note that although the content hash must be unique for future mints to prevent duplicate media,\r\n     * metadata has no such requirement.\r\n     */\r\n    function _mintForCreator(\r\n        address creator,\r\n        MediaData memory data,\r\n        IMarket.BidShares memory bidShares\r\n    ) internal onlyValidURI(data.tokenURI) onlyValidURI(data.metadataURI) {\r\n        require(data.contentHash != 0, \"Media: content hash must be non-zero\");\r\n        require(\r\n            data.metadataHash != 0,\r\n            \"Media: metadata hash must be non-zero\"\r\n        );\r\n\r\n        uint256 tokenId = _tokenIdTracker.current();\r\n\r\n        _safeMint(creator, tokenId);\r\n        _tokenIdTracker.increment();\r\n        _setTokenContentHash(tokenId, data.contentHash);\r\n        _setTokenMetadataHash(tokenId, data.metadataHash);\r\n        _setTokenMetadataURI(tokenId, data.metadataURI);\r\n        _setTokenURI(tokenId, data.tokenURI);\r\n        _creatorTokens[creator].add(tokenId);\r\n        _contentHashes[data.contentHash] = true;\r\n\r\n        tokenCreators[tokenId] = creator;\r\n        previousTokenOwners[tokenId] = creator;\r\n        IMarket(marketContract).setBidShares(tokenId, bidShares);\r\n    }\r\n\r\n    function getTokenCount() external view override returns(uint256) {\r\n        return _tokenIdTracker.current();\r\n    }  \r\n\r\n    function _setTokenContentHash(uint256 tokenId, bytes32 contentHash)\r\n        internal\r\n        virtual\r\n        onlyExistingToken(tokenId)\r\n    {\r\n        tokenContentHashes[tokenId] = contentHash;\r\n    }\r\n\r\n    function _setTokenMetadataHash(uint256 tokenId, bytes32 metadataHash)\r\n        internal\r\n        virtual\r\n        onlyExistingToken(tokenId)\r\n    {\r\n        tokenMetadataHashes[tokenId] = metadataHash;\r\n    }\r\n\r\n    function _setTokenMetadataURI(uint256 tokenId, string memory metadataURI)\r\n        internal\r\n        virtual\r\n        onlyExistingToken(tokenId)\r\n    {\r\n        _tokenMetadataURIs[tokenId] = metadataURI;\r\n    }\r\n\r\n    /**\r\n     * @notice Destroys `tokenId`.\r\n     * @dev We modify the OZ _burn implementation to\r\n     * maintain metadata and to remove the\r\n     * previous token owner from the piece\r\n     */\r\n    function _burn(uint256 tokenId) internal \r\n        override(ERC721, ERC721URIStorage)\r\n     {\r\n        super._burn(tokenId);\r\n        delete previousTokenOwners[tokenId];\r\n    }\r\n\r\n    function _beforeTokenTransfer(address from, address to, uint256 tokenId)\r\n        internal\r\n        override(ERC721, ERC721Enumerable)\r\n    {\r\n        super._beforeTokenTransfer(from, to, tokenId);\r\n    }\r\n\r\n    /**\r\n     * @notice transfer a token and remove the ask for it.\r\n     */\r\n    function _transfer(\r\n        address from,\r\n        address to,\r\n        uint256 tokenId\r\n    ) internal override {\r\n        IMarket(marketContract).removeAsk(tokenId);\r\n\r\n        super._transfer(from, to, tokenId);\r\n    }\r\n    \r\n    function supportsInterface(bytes4 interfaceId)\r\n        public\r\n        view\r\n        override(ERC721, ERC721Enumerable)\r\n        returns (bool)\r\n    {\r\n        return super.supportsInterface(interfaceId);\r\n    }\r\n    \r\n    /**\r\n     * @dev Calculates EIP712 DOMAIN_SEPARATOR based on the current contract and chain ID.\r\n     */\r\n    function _calculateDomainSeparator() internal view returns (bytes32) {\r\n        uint256 chainID;\r\n        /* solium-disable-next-line */\r\n        assembly {\r\n            chainID := chainid()\r\n        }\r\n\r\n        return\r\n            keccak256(\r\n                abi.encode(\r\n                    keccak256(\r\n                        \"EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)\"\r\n                    ),\r\n                    keccak256(bytes(\"PLOT\")),\r\n                    keccak256(bytes(\"1\")),\r\n                    chainID,\r\n                    address(this)\r\n                )\r\n            );\r\n    }\r\n\r\n}\r\n"
    },
    "@openzeppelin/contracts/token/ERC721/extensions/ERC721Burnable.sol": {
      "content": "// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts v4.4.1 (token/ERC721/extensions/ERC721Burnable.sol)\n\npragma solidity ^0.8.0;\n\nimport \"../ERC721.sol\";\nimport \"../../../utils/Context.sol\";\n\n/**\n * @title ERC721 Burnable Token\n * @dev ERC721 Token that can be irreversibly burned (destroyed).\n */\nabstract contract ERC721Burnable is Context, ERC721 {\n    /**\n     * @dev Burns `tokenId`. See {ERC721-_burn}.\n     *\n     * Requirements:\n     *\n     * - The caller must own `tokenId` or be an approved operator.\n     */\n    function burn(uint256 tokenId) public virtual {\n        //solhint-disable-next-line max-line-length\n        require(_isApprovedOrOwner(_msgSender(), tokenId), \"ERC721Burnable: caller is not owner nor approved\");\n        _burn(tokenId);\n    }\n}\n"
    },
    "@openzeppelin/contracts/token/ERC721/extensions/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"
    },
    "@openzeppelin/contracts/token/ERC721/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 \"./extensions/IERC721Metadata.sol\";\nimport \"../../utils/Address.sol\";\nimport \"../../utils/Context.sol\";\nimport \"../../utils/Strings.sol\";\nimport \"../../utils/introspection/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 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    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"
    },
    "@openzeppelin/contracts/token/ERC721/extensions/ERC721URIStorage.sol": {
      "content": "// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts v4.4.1 (token/ERC721/extensions/ERC721URIStorage.sol)\n\npragma solidity ^0.8.0;\n\nimport \"../ERC721.sol\";\n\n/**\n * @dev ERC721 token with storage based token URI management.\n */\nabstract contract ERC721URIStorage is ERC721 {\n    using Strings for uint256;\n\n    // Optional mapping for token URIs\n    mapping(uint256 => string) private _tokenURIs;\n\n    /**\n     * @dev See {IERC721Metadata-tokenURI}.\n     */\n    function tokenURI(uint256 tokenId) public view virtual override returns (string memory) {\n        require(_exists(tokenId), \"ERC721URIStorage: URI query for nonexistent token\");\n\n        string memory _tokenURI = _tokenURIs[tokenId];\n        string memory base = _baseURI();\n\n        // If there is no base URI, return the token URI.\n        if (bytes(base).length == 0) {\n            return _tokenURI;\n        }\n        // If both are set, concatenate the baseURI and tokenURI (via abi.encodePacked).\n        if (bytes(_tokenURI).length > 0) {\n            return string(abi.encodePacked(base, _tokenURI));\n        }\n\n        return super.tokenURI(tokenId);\n    }\n\n    /**\n     * @dev Sets `_tokenURI` as the tokenURI of `tokenId`.\n     *\n     * Requirements:\n     *\n     * - `tokenId` must exist.\n     */\n    function _setTokenURI(uint256 tokenId, string memory _tokenURI) internal virtual {\n        require(_exists(tokenId), \"ERC721URIStorage: URI set of nonexistent token\");\n        _tokenURIs[tokenId] = _tokenURI;\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 override {\n        super._burn(tokenId);\n\n        if (bytes(_tokenURIs[tokenId]).length != 0) {\n            delete _tokenURIs[tokenId];\n        }\n    }\n}\n"
    },
    "@openzeppelin/contracts/utils/Counters.sol": {
      "content": "// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts v4.4.1 (utils/Counters.sol)\n\npragma solidity ^0.8.0;\n\n/**\n * @title Counters\n * @author Matt Condon (@shrugs)\n * @dev Provides counters that can only be incremented, decremented or reset. This can be used e.g. to track the number\n * of elements in a mapping, issuing ERC721 ids, or counting request ids.\n *\n * Include with `using Counters for Counters.Counter;`\n */\nlibrary Counters {\n    struct Counter {\n        // This variable should never be directly accessed by users of the library: interactions must be restricted to\n        // the library's function. As of Solidity v0.5.2, this cannot be enforced, though there is a proposal to add\n        // this feature: see https://github.com/ethereum/solidity/issues/4637\n        uint256 _value; // default: 0\n    }\n\n    function current(Counter storage counter) internal view returns (uint256) {\n        return counter._value;\n    }\n\n    function increment(Counter storage counter) internal {\n        unchecked {\n            counter._value += 1;\n        }\n    }\n\n    function decrement(Counter storage counter) internal {\n        uint256 value = counter._value;\n        require(value > 0, \"Counter: decrement overflow\");\n        unchecked {\n            counter._value = value - 1;\n        }\n    }\n\n    function reset(Counter storage counter) internal {\n        counter._value = 0;\n    }\n}\n"
    },
    "@openzeppelin/contracts/utils/math/SafeMath.sol": {
      "content": "// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts (last updated v4.6.0) (utils/math/SafeMath.sol)\n\npragma solidity ^0.8.0;\n\n// CAUTION\n// This version of SafeMath should only be used with Solidity 0.8 or later,\n// because it relies on the compiler's built in overflow checks.\n\n/**\n * @dev Wrappers over Solidity's arithmetic operations.\n *\n * NOTE: `SafeMath` is generally not needed starting with Solidity 0.8, since the compiler\n * now has built in overflow checking.\n */\nlibrary SafeMath {\n    /**\n     * @dev Returns the addition of two unsigned integers, with an overflow flag.\n     *\n     * _Available since v3.4._\n     */\n    function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {\n        unchecked {\n            uint256 c = a + b;\n            if (c < a) return (false, 0);\n            return (true, c);\n        }\n    }\n\n    /**\n     * @dev Returns the subtraction of two unsigned integers, with an overflow flag.\n     *\n     * _Available since v3.4._\n     */\n    function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {\n        unchecked {\n            if (b > a) return (false, 0);\n            return (true, a - b);\n        }\n    }\n\n    /**\n     * @dev Returns the multiplication of two unsigned integers, with an overflow flag.\n     *\n     * _Available since v3.4._\n     */\n    function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) {\n        unchecked {\n            // Gas optimization: this is cheaper than requiring 'a' not being zero, but the\n            // benefit is lost if 'b' is also tested.\n            // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522\n            if (a == 0) return (true, 0);\n            uint256 c = a * b;\n            if (c / a != b) return (false, 0);\n            return (true, c);\n        }\n    }\n\n    /**\n     * @dev Returns the division of two unsigned integers, with a division by zero flag.\n     *\n     * _Available since v3.4._\n     */\n    function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {\n        unchecked {\n            if (b == 0) return (false, 0);\n            return (true, a / b);\n        }\n    }\n\n    /**\n     * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.\n     *\n     * _Available since v3.4._\n     */\n    function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {\n        unchecked {\n            if (b == 0) return (false, 0);\n            return (true, a % b);\n        }\n    }\n\n    /**\n     * @dev Returns the addition of two unsigned integers, reverting on\n     * overflow.\n     *\n     * Counterpart to Solidity's `+` operator.\n     *\n     * Requirements:\n     *\n     * - Addition cannot overflow.\n     */\n    function add(uint256 a, uint256 b) internal pure returns (uint256) {\n        return a + b;\n    }\n\n    /**\n     * @dev Returns the subtraction of two unsigned integers, reverting on\n     * overflow (when the result is negative).\n     *\n     * Counterpart to Solidity's `-` operator.\n     *\n     * Requirements:\n     *\n     * - Subtraction cannot overflow.\n     */\n    function sub(uint256 a, uint256 b) internal pure returns (uint256) {\n        return a - b;\n    }\n\n    /**\n     * @dev Returns the multiplication of two unsigned integers, reverting on\n     * overflow.\n     *\n     * Counterpart to Solidity's `*` operator.\n     *\n     * Requirements:\n     *\n     * - Multiplication cannot overflow.\n     */\n    function mul(uint256 a, uint256 b) internal pure returns (uint256) {\n        return a * b;\n    }\n\n    /**\n     * @dev Returns the integer division of two unsigned integers, reverting on\n     * division by zero. The result is rounded towards zero.\n     *\n     * Counterpart to Solidity's `/` operator.\n     *\n     * Requirements:\n     *\n     * - The divisor cannot be zero.\n     */\n    function div(uint256 a, uint256 b) internal pure returns (uint256) {\n        return a / b;\n    }\n\n    /**\n     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),\n     * reverting when dividing by zero.\n     *\n     * Counterpart to Solidity's `%` operator. This function uses a `revert`\n     * opcode (which leaves remaining gas untouched) while Solidity uses an\n     * invalid opcode to revert (consuming all remaining gas).\n     *\n     * Requirements:\n     *\n     * - The divisor cannot be zero.\n     */\n    function mod(uint256 a, uint256 b) internal pure returns (uint256) {\n        return a % b;\n    }\n\n    /**\n     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on\n     * overflow (when the result is negative).\n     *\n     * CAUTION: This function is deprecated because it requires allocating memory for the error\n     * message unnecessarily. For custom revert reasons use {trySub}.\n     *\n     * Counterpart to Solidity's `-` operator.\n     *\n     * Requirements:\n     *\n     * - Subtraction cannot overflow.\n     */\n    function sub(\n        uint256 a,\n        uint256 b,\n        string memory errorMessage\n    ) internal pure returns (uint256) {\n        unchecked {\n            require(b <= a, errorMessage);\n            return a - b;\n        }\n    }\n\n    /**\n     * @dev Returns the integer division of two unsigned integers, reverting with custom message on\n     * division by zero. The result is rounded towards zero.\n     *\n     * Counterpart to Solidity's `/` operator. Note: this function uses a\n     * `revert` opcode (which leaves remaining gas untouched) while Solidity\n     * uses an invalid opcode to revert (consuming all remaining gas).\n     *\n     * Requirements:\n     *\n     * - The divisor cannot be zero.\n     */\n    function div(\n        uint256 a,\n        uint256 b,\n        string memory errorMessage\n    ) internal pure returns (uint256) {\n        unchecked {\n            require(b > 0, errorMessage);\n            return a / b;\n        }\n    }\n\n    /**\n     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),\n     * reverting with custom message when dividing by zero.\n     *\n     * CAUTION: This function is deprecated because it requires allocating memory for the error\n     * message unnecessarily. For custom revert reasons use {tryMod}.\n     *\n     * Counterpart to Solidity's `%` operator. This function uses a `revert`\n     * opcode (which leaves remaining gas untouched) while Solidity uses an\n     * invalid opcode to revert (consuming all remaining gas).\n     *\n     * Requirements:\n     *\n     * - The divisor cannot be zero.\n     */\n    function mod(\n        uint256 a,\n        uint256 b,\n        string memory errorMessage\n    ) internal pure returns (uint256) {\n        unchecked {\n            require(b > 0, errorMessage);\n            return a % b;\n        }\n    }\n}\n"
    },
    "@openzeppelin/contracts/utils/math/Math.sol": {
      "content": "// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts (last updated v4.5.0) (utils/math/Math.sol)\n\npragma solidity ^0.8.0;\n\n/**\n * @dev Standard math utilities missing in the Solidity language.\n */\nlibrary Math {\n    /**\n     * @dev Returns the largest of two numbers.\n     */\n    function max(uint256 a, uint256 b) internal pure returns (uint256) {\n        return a >= b ? a : b;\n    }\n\n    /**\n     * @dev Returns the smallest of two numbers.\n     */\n    function min(uint256 a, uint256 b) internal pure returns (uint256) {\n        return a < b ? a : b;\n    }\n\n    /**\n     * @dev Returns the average of two numbers. The result is rounded towards\n     * zero.\n     */\n    function average(uint256 a, uint256 b) internal pure returns (uint256) {\n        // (a + b) / 2 can overflow.\n        return (a & b) + (a ^ b) / 2;\n    }\n\n    /**\n     * @dev Returns the ceiling of the division of two numbers.\n     *\n     * This differs from standard division with `/` in that it rounds up instead\n     * of rounding down.\n     */\n    function ceilDiv(uint256 a, uint256 b) internal pure returns (uint256) {\n        // (a + b - 1) / b can overflow on addition, so we distribute.\n        return a / b + (a % b == 0 ? 0 : 1);\n    }\n}\n"
    },
    "@openzeppelin/contracts/token/ERC20/IERC20.sol": {
      "content": "// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC20/IERC20.sol)\n\npragma solidity ^0.8.0;\n\n/**\n * @dev Interface of the ERC20 standard as defined in the EIP.\n */\ninterface IERC20 {\n    /**\n     * @dev Emitted when `value` tokens are moved from one account (`from`) to\n     * another (`to`).\n     *\n     * Note that `value` may be zero.\n     */\n    event Transfer(address indexed from, address indexed to, uint256 value);\n\n    /**\n     * @dev Emitted when the allowance of a `spender` for an `owner` is set by\n     * a call to {approve}. `value` is the new allowance.\n     */\n    event Approval(address indexed owner, address indexed spender, uint256 value);\n\n    /**\n     * @dev Returns the amount of tokens in existence.\n     */\n    function totalSupply() external view returns (uint256);\n\n    /**\n     * @dev Returns the amount of tokens owned by `account`.\n     */\n    function balanceOf(address account) external view returns (uint256);\n\n    /**\n     * @dev Moves `amount` tokens from the caller's account to `to`.\n     *\n     * Returns a boolean value indicating whether the operation succeeded.\n     *\n     * Emits a {Transfer} event.\n     */\n    function transfer(address to, uint256 amount) external returns (bool);\n\n    /**\n     * @dev Returns the remaining number of tokens that `spender` will be\n     * allowed to spend on behalf of `owner` through {transferFrom}. This is\n     * zero by default.\n     *\n     * This value changes when {approve} or {transferFrom} are called.\n     */\n    function allowance(address owner, address spender) external view returns (uint256);\n\n    /**\n     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.\n     *\n     * Returns a boolean value indicating whether the operation succeeded.\n     *\n     * IMPORTANT: Beware that changing an allowance with this method brings the risk\n     * that someone may use both the old and the new allowance by unfortunate\n     * transaction ordering. One possible solution to mitigate this race\n     * condition is to first reduce the spender's allowance to 0 and set the\n     * desired value afterwards:\n     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729\n     *\n     * Emits an {Approval} event.\n     */\n    function approve(address spender, uint256 amount) external returns (bool);\n\n    /**\n     * @dev Moves `amount` tokens from `from` to `to` using the\n     * allowance mechanism. `amount` is then deducted from the caller's\n     * allowance.\n     *\n     * Returns a boolean value indicating whether the operation succeeded.\n     *\n     * Emits a {Transfer} event.\n     */\n    function transferFrom(\n        address from,\n        address to,\n        uint256 amount\n    ) external returns (bool);\n}\n"
    },
    "@openzeppelin/contracts/access/Ownable.sol": {
      "content": "// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts v4.4.1 (access/Ownable.sol)\n\npragma solidity ^0.8.0;\n\nimport \"../utils/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 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    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"
    },
    "@openzeppelin/contracts/security/ReentrancyGuard.sol": {
      "content": "// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts v4.4.1 (security/ReentrancyGuard.sol)\n\npragma solidity ^0.8.0;\n\n/**\n * @dev Contract module that helps prevent reentrant calls to a function.\n *\n * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier\n * available, which can be applied to functions to make sure there are no nested\n * (reentrant) calls to them.\n *\n * Note that because there is a single `nonReentrant` guard, functions marked as\n * `nonReentrant` may not call one another. This can be worked around by making\n * those functions `private`, and then adding `external` `nonReentrant` entry\n * points to them.\n *\n * TIP: If you would like to learn more about reentrancy and alternative ways\n * to protect against it, check out our blog post\n * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].\n */\nabstract contract ReentrancyGuard {\n    // Booleans are more expensive than uint256 or any type that takes up a full\n    // word because each write operation emits an extra SLOAD to first read the\n    // slot's contents, replace the bits taken up by the boolean, and then write\n    // back. This is the compiler's defense against contract upgrades and\n    // pointer aliasing, and it cannot be disabled.\n\n    // The values being non-zero value makes deployment a bit more expensive,\n    // but in exchange the refund on every call to nonReentrant will be lower in\n    // amount. Since refunds are capped to a percentage of the total\n    // transaction's gas, it is best to keep them low in cases like this one, to\n    // increase the likelihood of the full refund coming into effect.\n    uint256 private constant _NOT_ENTERED = 1;\n    uint256 private constant _ENTERED = 2;\n\n    uint256 private _status;\n\n    constructor() {\n        _status = _NOT_ENTERED;\n    }\n\n    /**\n     * @dev Prevents a contract from calling itself, directly or indirectly.\n     * Calling a `nonReentrant` function from another `nonReentrant`\n     * function is not supported. It is possible to prevent this from happening\n     * by making the `nonReentrant` function external, and making it call a\n     * `private` function that does the actual work.\n     */\n    modifier nonReentrant() {\n        // On the first call to nonReentrant, _notEntered will be true\n        require(_status != _ENTERED, \"ReentrancyGuard: reentrant call\");\n\n        // Any calls to nonReentrant after this point will fail\n        _status = _ENTERED;\n\n        _;\n\n        // By storing the original value once again, a refund is triggered (see\n        // https://eips.ethereum.org/EIPS/eip-2200)\n        _status = _NOT_ENTERED;\n    }\n}\n"
    },
    "contracts/Decimal.sol": {
      "content": "// SPDX-License-Identifier:MIT\r\npragma solidity ^0.8.7;\r\npragma experimental ABIEncoderV2;\r\n\r\n/**\r\n * NOTE: This file is a clone of the dydx protocol's Decimal.sol contract. It was forked from https://github.com/dydxprotocol/solo\r\n * at commit 2d8454e02702fe5bc455b848556660629c3cad36\r\n *\r\n * It has not been modified other than to use a newer solidity in the pragma to match the rest of the contract suite of this project\r\n */\r\n\r\nimport {SafeMath} from \"@openzeppelin/contracts/utils/math/SafeMath.sol\";\r\nimport {Math} from \"./Math.sol\";\r\n\r\n/**\r\n * @title Decimal\r\n *\r\n * Library that defines a fixed-point number with 18 decimal places.\r\n */\r\nlibrary Decimal {\r\n    using SafeMath for uint256;\r\n\r\n    // ============ Constants ============\r\n\r\n    uint256 constant BASE_POW = 18;\r\n    uint256 constant BASE = 10**BASE_POW;\r\n\r\n    // ============ Structs ============\r\n\r\n    struct D256 {\r\n        uint256 value;\r\n    }\r\n\r\n    // ============ Functions ============\r\n\r\n    function one() internal pure returns (D256 memory) {\r\n        return D256({value: BASE});\r\n    }\r\n\r\n    function onePlus(D256 memory d) internal pure returns (D256 memory) {\r\n        return D256({value: d.value.add(BASE)});\r\n    }\r\n\r\n    function mul(uint256 target, D256 memory d)\r\n        internal\r\n        pure\r\n        returns (uint256)\r\n    {\r\n        return Math.getPartial(target, d.value, BASE);\r\n    }\r\n\r\n    function div(uint256 target, D256 memory d)\r\n        internal\r\n        pure\r\n        returns (uint256)\r\n    {\r\n        return Math.getPartial(target, BASE, d.value);\r\n    }\r\n}\r\n"
    },
    "contracts/interfaces/IMarket.sol": {
      "content": "// SPDX-License-Identifier:MIT\r\npragma solidity ^0.8.7;\r\npragma experimental ABIEncoderV2;\r\n\r\nimport {Decimal} from \"../Decimal.sol\";\r\n\r\n/**\r\n * @title Interface for Plot Protocol's Market\r\n */\r\ninterface IMarket {\r\n    struct Bid {\r\n        // Amount of the currency being bid\r\n        uint256 amount;\r\n        // Address to the ERC20 token being used to bid\r\n        address currency;\r\n        // Address of the bidder\r\n        address bidder;\r\n        // Address of the recipient\r\n        address recipient;\r\n        // % of the next sale to award the current owner\r\n        Decimal.D256 sellOnShare;\r\n    }\r\n\r\n    struct Ask {\r\n        // Amount of the currency being asked\r\n        uint256 amount;\r\n        // Address to the ERC20 token being asked\r\n        address currency;\r\n    }\r\n\r\n    struct BidShares {\r\n        // % of sale value that goes to the _previous_ owner of the nft\r\n        Decimal.D256 prevOwner;\r\n        // % of sale value that goes to the original creator of the nft\r\n        Decimal.D256 creator;\r\n        // % of sale value that goes to the seller (current owner) of the nft\r\n        Decimal.D256 owner;\r\n    }\r\n\r\n    struct TokenAskInfo {\r\n        uint256 tokenId;\r\n        uint256 askValue; \r\n        address tokenOwner;\r\n    }\r\n    \r\n    event BidCreated(uint256 indexed tokenId, Bid bid);\r\n    event BidRemoved(uint256 indexed tokenId, Bid bid);\r\n    event BidFinalized(uint256 indexed tokenId, Bid bid);\r\n    event AskCreated(uint256 indexed tokenId, Ask ask);\r\n    event AskRemoved(uint256 indexed tokenId, Ask ask);\r\n    event BidShareUpdated(uint256 indexed tokenId, BidShares bidShares);\r\n\r\n    function bidForTokenBidder(uint256 tokenId, address bidder)\r\n        external\r\n        view\r\n        returns (Bid memory);\r\n\r\n    function currentAskForToken(uint256 tokenId)\r\n        external\r\n        view\r\n        returns (Ask memory);\r\n\r\n    function bidSharesForToken(uint256 tokenId)\r\n        external\r\n        view\r\n        returns (BidShares memory);\r\n\r\n    function isValidBid(uint256 tokenId, uint256 bidAmount)\r\n        external\r\n        view\r\n        returns (bool);\r\n\r\n    function isValidBidShares(BidShares calldata bidShares)\r\n        external\r\n        pure\r\n        returns (bool);\r\n\r\n    function splitShare(Decimal.D256 calldata sharePercentage, uint256 amount)\r\n        external\r\n        pure\r\n        returns (uint256);\r\n\r\n    function configure(address mediaContractAddress) external;\r\n\r\n    function setBidShares(uint256 tokenId, BidShares calldata bidShares)\r\n        external;\r\n\r\n    function setAsk(uint256 tokenId, Ask calldata ask) external;\r\n\r\n    function removeAsk(uint256 tokenId) external;\r\n\r\n    function setBid(\r\n        uint256 tokenId,\r\n        Bid calldata bid,\r\n        address spender\r\n    ) external;\r\n\r\n    function removeBid(uint256 tokenId, address bidder) external;\r\n\r\n    function acceptBid(uint256 tokenId, Bid calldata expectedBid) external;\r\n}\r\n"
    },
    "contracts/interfaces/IMedia.sol": {
      "content": "// SPDX-License-Identifier:MIT\r\npragma solidity ^0.8.7;\r\npragma experimental ABIEncoderV2;\r\n\r\nimport {IMarket} from \"./IMarket.sol\";\r\n\r\n/**\r\n * @title Interface for Plot Protocol's Media\r\n */\r\ninterface IMedia {\r\n    struct EIP712Signature {\r\n        uint256 deadline;\r\n        uint8 v;\r\n        bytes32 r;\r\n        bytes32 s;\r\n    }\r\n\r\n    struct MediaData {\r\n        // A valid URI of the content represented by this token\r\n        string tokenURI;\r\n        // A valid URI of the metadata associated with this token\r\n        string metadataURI;\r\n        // A SHA256 hash of the content pointed to by tokenURI\r\n        bytes32 contentHash;\r\n        // A SHA256 hash of the content pointed to by metadataURI\r\n        bytes32 metadataHash;\r\n    }\r\n\r\n    event TokenURIUpdated(uint256 indexed _tokenId, address owner, string _uri);\r\n    event TokenMetadataURIUpdated(\r\n        uint256 indexed _tokenId,\r\n        address owner,\r\n        string _uri\r\n    );\r\n\r\n    /**\r\n     * @notice Return the metadata URI for a piece of media given the token URI\r\n     */\r\n    function tokenMetadataURI(uint256 tokenId)\r\n        external\r\n        view\r\n        returns (string memory);\r\n\r\n    /**\r\n     * @notice Mint new media for msg.sender.\r\n     */\r\n    function mint(MediaData calldata data, IMarket.BidShares calldata bidShares)\r\n        external;\r\n\r\n    /**\r\n     * @notice EIP-712 mintWithSig method. Mints new media for a creator given a valid signature.\r\n     */\r\n    function mintWithSig(\r\n        address creator,\r\n        MediaData calldata data,\r\n        IMarket.BidShares calldata bidShares,\r\n        EIP712Signature calldata sig\r\n    ) external;\r\n\r\n    /**\r\n     * @notice Transfer the token with the given ID to a given address.\r\n     * Save the previous owner before the transfer, in case there is a sell-on fee.\r\n     * @dev This can only be called by the auction contract specified at deployment\r\n     */\r\n    function auctionTransfer(uint256 tokenId, address recipient) external;\r\n\r\n    /**\r\n     * @notice Set the ask on a piece of media\r\n     */\r\n    function setAsk(uint256 tokenId, IMarket.Ask calldata ask) external;\r\n\r\n    /**\r\n     * @notice Remove the ask on a piece of media\r\n     */\r\n    function removeAsk(uint256 tokenId) external;\r\n\r\n    /**\r\n     * @notice Set the bid on a piece of media\r\n     */\r\n    function setBid(uint256 tokenId, IMarket.Bid calldata bid) external;\r\n\r\n    /**\r\n     * @notice Remove the bid on a piece of media\r\n     */\r\n    function removeBid(uint256 tokenId) external;\r\n\r\n    function acceptBid(uint256 tokenId, IMarket.Bid calldata bid) external;\r\n\r\n    /**\r\n     * @notice Revoke approval for a piece of media\r\n     */\r\n    function revokeApproval(uint256 tokenId) external;\r\n\r\n    /**\r\n     * @notice Update the token URI\r\n     */\r\n    function updateTokenURI(uint256 tokenId, string calldata tokenURI) external;\r\n\r\n    /**\r\n     * @notice get token count\r\n     */\r\n    function getTokenCount() external view returns(uint256);\r\n\r\n    /**\r\n     * @notice Update the token metadata uri\r\n     */\r\n    function updateTokenMetadataURI(\r\n        uint256 tokenId,\r\n        string calldata metadataURI\r\n    ) external;\r\n\r\n    /**\r\n     * @notice EIP-712 permit method. Sets an approved spender given a valid signature.\r\n     */\r\n    function permit(\r\n        address spender,\r\n        uint256 tokenId,\r\n        EIP712Signature calldata sig\r\n    ) external;\r\n}\r\n"
    },
    "@openzeppelin/contracts/utils/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"
    },
    "@openzeppelin/contracts/token/ERC721/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 \"../../utils/introspection/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"
    },
    "@openzeppelin/contracts/token/ERC721/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"
    },
    "@openzeppelin/contracts/token/ERC721/extensions/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"
    },
    "@openzeppelin/contracts/utils/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"
    },
    "@openzeppelin/contracts/utils/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"
    },
    "@openzeppelin/contracts/utils/introspection/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"
    },
    "@openzeppelin/contracts/utils/introspection/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"
    },
    "@openzeppelin/contracts/token/ERC721/extensions/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"
    },
    "contracts/Math.sol": {
      "content": "// SPDX-License-Identifier:MIT\r\npragma solidity ^0.8.7;\r\npragma experimental ABIEncoderV2;\r\n\r\nimport {SafeMath} from \"@openzeppelin/contracts/utils/math/SafeMath.sol\";\r\n\r\n/**\r\n * @title Math\r\n *\r\n * Library for non-standard Math functions\r\n * NOTE: This file is a clone of the dydx protocol's Decimal.sol contract.\r\n * It was forked from https://github.com/dydxprotocol/solo at commit\r\n * 2d8454e02702fe5bc455b848556660629c3cad36. It has not been modified other than to use a\r\n * newer solidity in the pragma to match the rest of the contract suite of this project.\r\n */\r\nlibrary Math {\r\n    using SafeMath for uint256;\r\n\r\n    // ============ Library Functions ============\r\n\r\n    /*\r\n     * Return target * (numerator / denominator).\r\n     */\r\n    function getPartial(\r\n        uint256 target,\r\n        uint256 numerator,\r\n        uint256 denominator\r\n    ) internal pure returns (uint256) {\r\n        return target.mul(numerator).div(denominator);\r\n    }\r\n\r\n    /*\r\n     * Return target * (numerator / denominator), but rounded up.\r\n     */\r\n    function getPartialRoundUp(\r\n        uint256 target,\r\n        uint256 numerator,\r\n        uint256 denominator\r\n    ) internal pure returns (uint256) {\r\n        if (target == 0 || numerator == 0) {\r\n            // SafeMath will check for zero denominator\r\n            return SafeMath.div(0, denominator);\r\n        }\r\n        return target.mul(numerator).sub(1).div(denominator).add(1);\r\n    }\r\n\r\n    function to128(uint256 number) internal pure returns (uint128) {\r\n        uint128 result = uint128(number);\r\n        require(result == number, \"Math: Unsafe cast to uint128\");\r\n        return result;\r\n    }\r\n\r\n    function to96(uint256 number) internal pure returns (uint96) {\r\n        uint96 result = uint96(number);\r\n        require(result == number, \"Math: Unsafe cast to uint96\");\r\n        return result;\r\n    }\r\n\r\n    function to32(uint256 number) internal pure returns (uint32) {\r\n        uint32 result = uint32(number);\r\n        require(result == number, \"Math: Unsafe cast to uint32\");\r\n        return result;\r\n    }\r\n\r\n    function min(uint256 a, uint256 b) internal pure returns (uint256) {\r\n        return a < b ? a : b;\r\n    }\r\n\r\n    function max(uint256 a, uint256 b) internal pure returns (uint256) {\r\n        return a > b ? a : b;\r\n    }\r\n}\r\n"
    }
  },
  "settings": {
    "optimizer": {
      "enabled": true,
      "runs": 200
    },
    "outputSelection": {
      "*": {
        "*": [
          "evm.bytecode",
          "evm.deployedBytecode",
          "devdoc",
          "userdoc",
          "metadata",
          "abi"
        ]
      }
    },
    "libraries": {}
  }
}