ERC-721
Overview
Max Total Supply
2,393 GOJU
Holders
518
Market
Volume (24H)
N/A
Min Price (24H)
N/A
Max Price (24H)
N/A
Other Info
Token Contract
Balance
2 GOJULoading...
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# | Exchange | Pair | Price | 24H Volume | % Volume |
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Contract Name:
GojuoNFT
Compiler Version
v0.8.7+commit.e28d00a7
Optimization Enabled:
Yes with 20 runs
Other Settings:
default evmVersion
Contract Source Code (Solidity Standard Json-Input format)
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import "./ERC721Tradable.sol"; /** * @title GojuoNFT * GojuoNFT - a smart contract for Gojuon non-fungible token. */ contract GojuoNFT is ERC721Tradable { mapping (uint256 => string) private _tokenMidContents; mapping (uint256 => bytes32) private _tokenMidContentHashes; string[] private _tokenKanaWords = [ "a","i","u","e","o", "ka","ki","ku","ke","ko", "sa","shi","su","se","so", "ta","chi","tsu","te","to", "na","ni","nu","ne","no", "ha","hi","fu","he","ho", "ma","mi","mu","me","mo", "ya","yu","yo", "ra","ri","ru","re","ro", "wa","wo","n" ]; string[] private _tokenKanjiWords0 = [ "sun","moon","fire","water","wood","gold" ]; string[] private _tokenKanjiWords1 = [ "soil","peak","ice","air","circle","wide" ]; constructor(address _proxyRegistryAddress) ERC721Tradable("GojuoNFT", "GOJU", _proxyRegistryAddress) { _tokenMidContentHashes[0] = 0x9650ce19ad7b524d1ffd3899fa3241ffc06942b5ac71fe868ae311bc89473490; _tokenMidContentHashes[1] = 0xb336ae9b38480edf2d0a1cf9479525ba34f3d3c513df98db6c91bcc9a489699d; _tokenMidContentHashes[2] = 0x6a55639f64b2db3da80a9f9e78a85e3e180411e20798a5a41f02199de10bcb2a; _tokenMidContentHashes[3] = 0x52b57e6365c8eb2f01e23bdad945721d3f5b51f511d1c9a10d2406842745cefb; _tokenMidContentHashes[4] = 0x5c7e4aed1c393c6e2543d5e321b115283667559e88f87fd823eea989bca9505f; _tokenMidContentHashes[5] = 0xa67e12cea8b94ea6344ffcea8f5569c2e5af352c2d706865f2ef9d0202f9b9c9; _tokenMidContentHashes[6] = 0x0f3b966b558d6b842ece867764f0355efaba4bb235be071fcc45adf574948999; _tokenMidContentHashes[7] = 0x5f2b7678e28a0a2267b902d39de93ada3019312249e686b05f220da750e300f2; _tokenMidContentHashes[8] = 0x82f5b3fe5dc7a2853fde5bc22f0014b90cca2ef03e3091cd6b1d9d6677c3d12a; _tokenMidContentHashes[9] = 0x566e04f321c403572ff50d97d2848acacb8b1eb517a59e189fa819ce45e2a041; _tokenMidContentHashes[10] = 0x552b87264635fac094e7068e10db5a63e62b5cd67f52d08745b1a8427328a204; _tokenMidContentHashes[11] = 0x81af94ad9a621120f9bf5478dba19b4e9245f5a3830c07f3d08da88fb44f6061; _tokenMidContentHashes[12] = 0x132161ac353e852105ebb6e8002b92a944c683e56dc386b9c4acd34e3d99fb40; _tokenMidContentHashes[13] = 0x6ce7f3a19ba15a3d8cc87d271879c4473c2073ed74ebae47bccdae8e5a19ff72; _tokenMidContentHashes[14] = 0x7560fe13342bcac3347bad171cb2f54cc86d1eb23548a2f0fbd02ba967584892; _tokenMidContentHashes[15] = 0x8da33fc424ba7094d95231cc535a3d664f0f24dade53fe543a4d0fd309b4e465; _tokenMidContentHashes[16] = 0xc5858ec3f47fa778f651736e98adf57662d0e65b1bfd75d4265891eca1455786; _tokenMidContentHashes[17] = 0x6589ce1462d029685d0090469ee11713383573a7ac3b6d9d92ccaec0c6315355; _tokenMidContentHashes[18] = 0x6dc6ceef073da7909daa9adb73ba8055c41dfee721b147358564a04a20039593; _tokenMidContentHashes[19] = 0xc82ce6b609c7eb34dc2ddaed8ad996b60b7e4196a85b26a8370bb3c11279d5d7; _tokenMidContentHashes[20] = 0xde568d7dee5bd77594d7f2a375c6b76fd953d67d9a5613cfccca0e992f792242; _tokenMidContentHashes[21] = 0x90a6b28ea887fc24fd7e6a5957cbfe9f43125a4552e439e6becea0963d6f1cfa; _tokenMidContentHashes[22] = 0xc5b64e0440bce22084dc1d3f415c54a1b3c3d4555a888d40d4d9f1f256e20bd0; _tokenMidContentHashes[23] = 0xf89a002603020bd27500e1248ab15875c314970ab26f546937ec86dc23e0e955; _tokenMidContentHashes[24] = 0x1dffb249c59950b3ad516160a147653cb575d4bf1f2861b17d75471f4998d026; _tokenMidContentHashes[25] = 0xb664fc171e3cec988707352c6e8f1dbea0a507e8e7abaf4903108e6c0bb056e1; _tokenMidContentHashes[26] = 0xe2c74811d75bd8889876a15582173f95ef3d7ab6b2bd90be27cad20e6fb62d45; _tokenMidContentHashes[27] = 0x386f91bddc8a75058f31f5ea1030df6e2735ca6ff487e0975b243bf1fa837315; _tokenMidContentHashes[28] = 0x9f725f09744893b23f7479d4046a3e7d7e8c3a0dbcaeb6172c413d23e4cd0a4e; _tokenMidContentHashes[29] = 0x7eb079f6515ed8ccceca6b1abae4b30be5321f7d6015b816141934f6729d01c7; _tokenMidContentHashes[30] = 0x753073fe3bd8a310fc4948279f17fcf3379f60bef3f5b80603a8f52912d60c9e; _tokenMidContentHashes[31] = 0x118904718aefaf99e5880fe713081b61f5ee739b320f0a677330367f187dd18d; _tokenMidContentHashes[32] = 0x8cb587780070c627a24c9a924d8b81439f1c6e6e24e64b253c6a37cda96b3715; _tokenMidContentHashes[33] = 0x2bfe3db5aa42f27ea684e71f8f17a17537d0738f89d01dd8030bd5c2e121a29e; _tokenMidContentHashes[34] = 0x90017268aec14258357a42025a02cf33a688a80afd463ad2e3f0d60eb8a7929e; _tokenMidContentHashes[35] = 0x2f22b3eb1ec9685cdfbe86c0887b1e568b381ba852529127c7e074b8da527928; _tokenMidContentHashes[36] = 0x9f762612b235b0f023eb83417a6b322a9d11481a1378af160880c600e465ff53; _tokenMidContentHashes[37] = 0x263d752785c31090997652b1da672a721bc5467f66c3e5f457e594f1e2b81dc3; _tokenMidContentHashes[38] = 0x4ca2673e4e665d4a988b7fe686a63afec8d6d1ba14fe562e2d7d308bb20ca29b; _tokenMidContentHashes[39] = 0xa5e877090f83bc44e12d8ca6f96117fa57c612f2f26979d3ad1884584abe49d1; _tokenMidContentHashes[40] = 0xee5ad687929e92f08763e30c4ec930e126434fc67514f77c44e40f48338f2603; _tokenMidContentHashes[41] = 0xd0953a5a55067e29e3acd05327368bc9196fe2e19c1502b9fc4d6543a1a1c29e; _tokenMidContentHashes[42] = 0xd701952d7104bd11f10610ec9623665887ce70179a0df1997f9449c93f6e3cd2; _tokenMidContentHashes[43] = 0xa8070397febd15dc0099d607821d9f2763a668b01d0fbdea1c34a9c4ec46df6f; _tokenMidContentHashes[44] = 0xb8824b8e73ed06b8513ebf892c4e053705089d1cbd92219ce4cd60c48afb2e87; _tokenMidContentHashes[45] = 0x437a31d92937be2e5fadae6d138395c4ab37046b987d1b1794e754796659fb2e; _tokenMidContentHashes[46] = 0x0199050f9161a920c8731bffa6262713d54a2d86c46250931123966e46e71526; _tokenMidContentHashes[47] = 0x9939546e73069bd028560ce205acd1c947266440a7c5dffbd059f2d5ff83208f; _tokenMidContentHashes[48] = 0x861681e9b5f8b7cc4b411dadb362b77784487a1c086975c5cb61c2ae8b2bcb1c; _tokenMidContentHashes[49] = 0x4f232cf5d81a4489c907cf0c62e034b22843c7b4e2ab8197b307ae58af09406e; _tokenMidContentHashes[50] = 0xe5fc98b909f000f55ac1c484e4b8a687d908812e3a884a6355ff4e5ec8a52796; _tokenMidContentHashes[51] = 0x9db7e5fdf4bf71de8d4bda622bb48fb67830ed5801f90c79e71fcceb17ba0bf1; _tokenMidContentHashes[52] = 0x57c29dc3d94ea0ee8450f5d503fb8805428a60e5f38eaa6d87a916ae568bd391; _tokenMidContentHashes[53] = 0x31a6dd4d2814ad671c5c2e1f7e7dfce0e5969c0de8bbfb3670eda5a58884b86c; _tokenMidContentHashes[54] = 0x46d0f4055726b4933084e6b0397581dd82888a6c0c2958b091fe8bcee209e21e; _tokenMidContentHashes[55] = 0x89a1db70123a24ddef0dd39fedd88d1aed12b25156c97520c22b8c406c2e189d; _tokenMidContentHashes[56] = 0x1f8f137ca903f46c790cf7e247493da95c9fa093836bdb87aed16267c85bd633; _tokenMidContentHashes[57] = 0x2ce299f73559ec6006ff778cbe572d3f6be7dddf14d88eba94bde6274b3120f3; _tokenMidContentHashes[58] = 0x783dafe3bc34bbfb49d9ee9b3685b285f9fb456b31a2c911f1121341a995f20b; _tokenMidContentHashes[59] = 0x260f095a91d0be3495f145b22e8bc0ceb9e722238bbed4989c8566913f712dd4; _tokenMidContentHashes[60] = 0x9b9fd19745f46ecaf0f3ba3eb7d049ba7f6e6ef0a5cd46fb3888f69d5cb63f1a; _tokenMidContentHashes[61] = 0xc42e695f4ee6c236380e2f8a56203cb48b797fac8bb675b1d2632e1da00a6e6b; _tokenMidContentHashes[62] = 0xac64d3b3d7a704ab7b59003e753b19ec8f0eeec02ce8de0e7f7ce8c6c04911a5; _tokenMidContentHashes[63] = 0xb6947eae3441b9496436e0605fdcfd89df4ca478a86e8b729d7b2e044a5fa91c; _tokenMidContentHashes[64] = 0x350e62beb83c85a82a40a4755e6de7b48d3c3f107ab19a077aa5a7bf08d96780; _tokenMidContentHashes[65] = 0x230f8db27086b7f0ed5fe67cb6e801f7183c2a5bb2e8c332dd8fabb627e28091; _tokenMidContentHashes[66] = 0x471ad3d31fa25598f86d8a9456e61645ca5e1cbc76251d05a789695a9f4970a7; _tokenMidContentHashes[67] = 0xd29a77b63d2bf389b2ed3103425acb19d94eb376016180048482b13053fe8de4; _tokenMidContentHashes[68] = 0xcaf1d85dddc3b9a36304b7f12a78cbc4e28fc311ea7b52ee0906dc0808447662; _tokenMidContentHashes[69] = 0x10fa630ef45e59e10840723986542ed6ca25ebe0054537a20ce3a06180dfa6f8; _tokenMidContentHashes[70] = 0x97dfef88681bccd41cab451c565916a309e307011944f73a2993a0384fa10893; _tokenMidContentHashes[71] = 0xc6d77634cd8f93f3baa1d3a8aa911eead879e66bb3879079ae4a1ce24bf855d4; _tokenMidContentHashes[72] = 0xb1b30070212cba9640e1e77c821afd62904f5ddcb8ed41b4d238d89f5bbc6f2e; _tokenMidContentHashes[73] = 0xbf3fbc48d354ccdbe966ac4fce09f8e5ed0b68c4718f4ab7703b539ab0111517; _tokenMidContentHashes[74] = 0x2f1a310cb22dd990b116d9ede0267d55d3aeb110dc0f0b3e043b914dd748aed4; _tokenMidContentHashes[75] = 0x5b3bce99e6eedcc87a086ffc9bca480cff4075b6f593c5ff83a1b30782e4fe43; _tokenMidContentHashes[76] = 0xf1e46f2be1c113a80beb7d2e777859808b2e33e020d9ba60dd6ab3831d8e5b51; _tokenMidContentHashes[77] = 0x5ebf03cf01509e8631cf022aaae0b69c1a0c1c1798d02bf83af9fc27ad941ec6; _tokenMidContentHashes[78] = 0x3f91278012c5039c58f3971d7c2ef4b13c0fbf402cc28bbf91f3d6ed123f614f; _tokenMidContentHashes[79] = 0x1ea24c514540df5ad7e8484a232e7472e8bc66d6eae38c03f8b30fada02c28c7; _tokenMidContentHashes[80] = 0x5fac5003e25f6980de03da6b501ee4f460cf3bcda093f68eaa12dc806961e0f6; _tokenMidContentHashes[81] = 0x63ce9e3960a730a5f47c6320db8c4368f94e2ef6b7d64ff5e1944880864cd32e; _tokenMidContentHashes[82] = 0xfa2e7ec47ac7651ba741f518cb9af26bd016925e78428e38a1340f40f104a42b; _tokenMidContentHashes[83] = 0xa0f4161b0bcac7f93667b52ae9f5a8df504f70881801ace8203675d2445b5acd; _tokenMidContentHashes[84] = 0x5f3b81f5583d86526551ac861a96fb0e6d8ba001cfeb6278bb30d0f3b840323c; _tokenMidContentHashes[85] = 0x54eb601bfa70f5337be55e4355ffd4398e5b4cc6627cb6981e76cd06419ad6bc; _tokenMidContentHashes[86] = 0xfa3977e587bafc4f0f464628530146ff7c30863cf275b9d645a817b2d9d0d97e; _tokenMidContentHashes[87] = 0xa71211036e84dcf885ae4b9198a6c4e2e11bb33704ed52c69bd93cd28df37a70; _tokenMidContentHashes[88] = 0x0fe4bffa3040a687414476ab5b1a66d22b48ff9f407ef484c31335aac86ff0c0; _tokenMidContentHashes[89] = 0xfea3f2d066021563560c779021c0ddbe7152b55a65d5cc0f3b7d4ef8e7a95356; _tokenMidContentHashes[90] = 0xea7b325517c55f42b0c1b45cef656eecfda178de841aaeee22f3ca5b7ef8ac28; _tokenMidContentHashes[91] = 0x635a7455a706630a9f949f76f3c95aa2161de284b9b608e4d552552cc2f9f242; _tokenMidContentHashes[92] = 0xb64e3fec4e414b6b716714969401e0a3859d55c5702d1a19a493f0cfa4c1dabf; _tokenMidContentHashes[93] = 0x833df3bef30ab3893443a35133445b0b3e1d8000cf227bd09310d50a8b7c78ff; _tokenMidContentHashes[94] = 0x6ab91eb3a5b7986ee813380bef8590b228893cd2ae873086156fceda5aa32aa6; _tokenMidContentHashes[95] = 0xb5f059de37daa4c293b62512113abc5cff5568ce0b8e57a87f7f26cef2cae581; _tokenMidContentHashes[96] = 0x601de7bdc5507f3175b1ebff3e0757c50c2b63b4fd55033cf4c67d8da657da41; _tokenMidContentHashes[97] = 0x7a9dd784c4b171b65521f972bad33f8fbef3b35384c9ddb0b61cefa03e6bebed; _tokenMidContentHashes[98] = 0x4cff1425770ae1a616f41d79e640c213238899da86ea1a13ac46fac0b5c61c6f; _tokenMidContentHashes[99] = 0xe3242325f46764c383b8f11a9d70d4729f0fda57600b5285fd09d55de0dd0306; _tokenMidContentHashes[100] = 0x0bf1728c5265e34b120ea3516f6cf0762a9cf3034f52957aa2b896b547963d72; _tokenMidContentHashes[101] = 0x690de6045948cebf760a2b397d2709bfc6f23c871d7b055a97eac8fae8995462; _tokenMidContentHashes[102] = 0x5577f533d6c6ce544538e223a125a3d4471189cdfd362ed776a96016e874cf4b; _tokenMidContentHashes[103] = 0xceb8ff160b22e69bfd26a8a93c96568f57f1bcdc0527d0fe36633b8dad6b70e9; } function baseTokenURI() override public pure returns (string memory) { return "https://gojuonft.io/metadata/"; } function getSuit(uint256 _tokenId) public pure returns (string memory) { require(_tokenId >= 0 && _tokenId < 2704, "Token ID invalid"); uint256 suitNum = ( _tokenId / 13 ) % 4; string memory suit; if (suitNum == 0) { suit = "diamonds"; } else if (suitNum == 1) { suit = "clubs"; } else if (suitNum == 2) { suit = "hearts"; } else if (suitNum == 3) { suit = "spades"; } return suit; } function getRank(uint256 _tokenId) public pure returns (string memory) { require(_tokenId >= 0 && _tokenId < 2704, "Token ID invalid"); uint256 rankNum = _tokenId % 13; string memory rank; if (rankNum == 0) { rank = "A"; } else if (rankNum == 10) { rank = "J"; } else if (rankNum == 11) { rank = "Q"; } else if (rankNum == 12) { rank = "K"; } else { rank = Strings.toString(rankNum + 1); } return rank; } function getWord(uint256 _tokenId) public view returns (string memory) { require(_tokenId >= 0 && _tokenId < 2704, "Token ID invalid"); uint256 shifting_index; uint256 words_index; string memory prefix; if (_tokenId / 52 % 2 == 0) { shifting_index = _tokenId / 52 / 2; prefix = "hiragana-"; } else { shifting_index = (_tokenId / 52 - 1) / 2; prefix = "katakana-"; } if (_tokenId % 52 < shifting_index) { words_index = 52 + _tokenId % 52 - shifting_index; } else { words_index = _tokenId % 52 - shifting_index; } if (_tokenId / 52 % 2 == 0 && words_index > 45) { return _tokenKanjiWords0[words_index - 46]; } else if (_tokenId / 52 % 2 == 1 && words_index > 45) { return _tokenKanjiWords1[words_index - 46]; } else { return string(abi.encodePacked(prefix, _tokenKanaWords[words_index])); } } function getTopContent(string memory _suit) public pure returns (bytes memory) { string memory startPart; string memory suitPart1; string memory suitPart2; string memory suitPart3; string memory suitPart4; string memory endPart; startPart = " _____________________________\n| ? |\n"; endPart = " |\n"; if ( (keccak256(abi.encodePacked(_suit))) == (keccak256(abi.encodePacked("diamonds"))) ) { suitPart1 = "| /\\ "; suitPart2 = "| / \\"; suitPart3 = "| \\ /"; suitPart4 = "| \\/ "; } else if ( (keccak256(abi.encodePacked(_suit))) == (keccak256(abi.encodePacked("clubs"))) ) { suitPart1 = "| () "; suitPart2 = "| ()()"; suitPart3 = "| /\\ "; } else if ( (keccak256(abi.encodePacked(_suit))) == (keccak256(abi.encodePacked("hearts"))) ) { suitPart1 = "| /\\/\\"; suitPart2 = "| \\ /"; suitPart3 = "| \\/ "; } else if ( (keccak256(abi.encodePacked(_suit))) == (keccak256(abi.encodePacked("spades"))) ) { suitPart1 = "| /\\ "; suitPart2 = "| /__\\"; suitPart3 = "| /\\ "; } if ( (keccak256(abi.encodePacked(_suit))) == (keccak256(abi.encodePacked("diamonds"))) ) { return abi.encodePacked(startPart, suitPart1, endPart, suitPart2, endPart, suitPart3, endPart, suitPart4, endPart); } else { return abi.encodePacked(startPart, suitPart1, endPart, suitPart2, endPart, suitPart3, endPart); } } function getMidContent(uint256 _tokenId) public view returns (bytes memory) { require(_tokenId >= 0 && _tokenId < 104, "Refer to token ID 0-103 for middle part of NFT content"); return bytes(_tokenMidContents[_tokenId]); } function getBottomContent() public pure returns (bytes memory) { return bytes("| |\n| = ? = |\n|_____________________________|"); } // function sliceBytes32To10(bytes32 input) public pure returns (bytes10 output) { // assembly { // output := input // } // } function claim(address _to, uint256 _tokenId, string memory _tokenMidContent) public { require(_tokenId >= 0 && _tokenId < 2392, "Token ID invalid"); if (_tokenId >= 0 && _tokenId < 104) { require(bytes(_tokenMidContent).length == 429, "Token Content Size invalid"); require(_tokenMidContentHashes[_tokenId] == keccak256(abi.encodePacked(_tokenMidContent)), "Token Content invalid"); } else { _tokenMidContent = ""; } _safeMint(_to, _tokenId); _tokenMidContents[_tokenId] = _tokenMidContent; } function ownerClaim(address _to, uint256 _tokenId) public onlyOwner { require( _tokenId >= 2392 && _tokenId < 2704, "Token ID invalid"); _safeMint(_to, _tokenId); } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import "openzeppelin-solidity/contracts/token/ERC721/ERC721.sol"; import "openzeppelin-solidity/contracts/token/ERC721/extensions/ERC721Enumerable.sol"; import "openzeppelin-solidity/contracts/access/Ownable.sol"; import "openzeppelin-solidity/contracts/utils/math/SafeMath.sol"; import "openzeppelin-solidity/contracts/utils/Strings.sol"; import "./common/meta-transactions/ContentMixin.sol"; import "./common/meta-transactions/NativeMetaTransaction.sol"; contract OwnableDelegateProxy {} contract ProxyRegistry { mapping(address => OwnableDelegateProxy) public proxies; } /** * @title ERC721Tradable * ERC721Tradable - ERC721 contract that whitelists a trading address, and has minting functionality. */ abstract contract ERC721Tradable is ContextMixin, ERC721Enumerable, NativeMetaTransaction, Ownable { using SafeMath for uint256; address proxyRegistryAddress; constructor( string memory _name, string memory _symbol, address _proxyRegistryAddress ) ERC721(_name, _symbol) { proxyRegistryAddress = _proxyRegistryAddress; _initializeEIP712(_name); } function baseTokenURI() virtual public pure returns (string memory); function tokenURI(uint256 _tokenId) override public pure returns (string memory) { return string(abi.encodePacked(baseTokenURI(), Strings.toString(_tokenId))); } /** * Override isApprovedForAll to whitelist user's OpenSea proxy accounts to enable gas-less listings. */ function isApprovedForAll(address owner, address operator) override public view returns (bool) { // Whitelist OpenSea proxy contract for easy trading. ProxyRegistry proxyRegistry = ProxyRegistry(proxyRegistryAddress); if (address(proxyRegistry.proxies(owner)) == operator) { return true; } return super.isApprovedForAll(owner, operator); } /** * This is used instead of msg.sender as transactions won't be sent by the original token owner, but by OpenSea. */ function _msgSender() internal override view returns (address sender) { return ContextMixin.msgSender(); } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; abstract contract ContextMixin { function msgSender() internal view returns (address payable sender) { if (msg.sender == address(this)) { bytes memory array = msg.data; uint256 index = msg.data.length; assembly { // Load the 32 bytes word from memory with the address on the lower 20 bytes, and mask those. sender := and( mload(add(array, index)), 0xffffffffffffffffffffffffffffffffffffffff ) } } else { sender = payable(msg.sender); } return sender; } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import {Initializable} from "./Initializable.sol"; contract EIP712Base is Initializable { struct EIP712Domain { string name; string version; address verifyingContract; bytes32 salt; } string constant public ERC712_VERSION = "1"; bytes32 internal constant EIP712_DOMAIN_TYPEHASH = keccak256( bytes( "EIP712Domain(string name,string version,address verifyingContract,bytes32 salt)" ) ); bytes32 internal domainSeperator; // supposed to be called once while initializing. // one of the contracts that inherits this contract follows proxy pattern // so it is not possible to do this in a constructor function _initializeEIP712( string memory name ) internal initializer { _setDomainSeperator(name); } function _setDomainSeperator(string memory name) internal { domainSeperator = keccak256( abi.encode( EIP712_DOMAIN_TYPEHASH, keccak256(bytes(name)), keccak256(bytes(ERC712_VERSION)), address(this), bytes32(getChainId()) ) ); } function getDomainSeperator() public view returns (bytes32) { return domainSeperator; } function getChainId() public view returns (uint256) { uint256 id; assembly { id := chainid() } return id; } /** * Accept message hash and returns hash message in EIP712 compatible form * So that it can be used to recover signer from signature signed using EIP712 formatted data * https://eips.ethereum.org/EIPS/eip-712 * "\\x19" makes the encoding deterministic * "\\x01" is the version byte to make it compatible to EIP-191 */ function toTypedMessageHash(bytes32 messageHash) internal view returns (bytes32) { return keccak256( abi.encodePacked("\x19\x01", getDomainSeperator(), messageHash) ); } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; contract Initializable { bool inited = false; modifier initializer() { require(!inited, "already inited"); _; inited = true; } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import {SafeMath} from "openzeppelin-solidity/contracts/utils/math/SafeMath.sol"; import {EIP712Base} from "./EIP712Base.sol"; contract NativeMetaTransaction is EIP712Base { using SafeMath for uint256; bytes32 private constant META_TRANSACTION_TYPEHASH = keccak256( bytes( "MetaTransaction(uint256 nonce,address from,bytes functionSignature)" ) ); event MetaTransactionExecuted( address userAddress, address payable relayerAddress, bytes functionSignature ); mapping(address => uint256) nonces; /* * Meta transaction structure. * No point of including value field here as if user is doing value transfer then he has the funds to pay for gas * He should call the desired function directly in that case. */ struct MetaTransaction { uint256 nonce; address from; bytes functionSignature; } function executeMetaTransaction( address userAddress, bytes memory functionSignature, bytes32 sigR, bytes32 sigS, uint8 sigV ) public payable returns (bytes memory) { MetaTransaction memory metaTx = MetaTransaction({ nonce: nonces[userAddress], from: userAddress, functionSignature: functionSignature }); require( verify(userAddress, metaTx, sigR, sigS, sigV), "Signer and signature do not match" ); // increase nonce for user (to avoid re-use) nonces[userAddress] = nonces[userAddress].add(1); emit MetaTransactionExecuted( userAddress, payable(msg.sender), functionSignature ); // Append userAddress and relayer address at the end to extract it from calling context (bool success, bytes memory returnData) = address(this).call( abi.encodePacked(functionSignature, userAddress) ); require(success, "Function call not successful"); return returnData; } function hashMetaTransaction(MetaTransaction memory metaTx) internal pure returns (bytes32) { return keccak256( abi.encode( META_TRANSACTION_TYPEHASH, metaTx.nonce, metaTx.from, keccak256(metaTx.functionSignature) ) ); } function getNonce(address user) public view returns (uint256 nonce) { nonce = nonces[user]; } function verify( address signer, MetaTransaction memory metaTx, bytes32 sigR, bytes32 sigS, uint8 sigV ) internal view returns (bool) { require(signer != address(0), "NativeMetaTransaction: INVALID_SIGNER"); return signer == ecrecover( toTypedMessageHash(hashMetaTransaction(metaTx)), sigV, sigR, sigS ); } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import "../utils/Context.sol"; /** * @dev Contract module which provides a basic access control mechanism, where * there is an account (an owner) that can be granted exclusive access to * specific functions. * * By default, the owner account will be the one that deploys the contract. This * can later be changed with {transferOwnership}. * * This module is used through inheritance. It will make available the modifier * `onlyOwner`, which can be applied to your functions to restrict their use to * the owner. */ abstract contract Ownable is Context { address private _owner; event OwnershipTransferred(address indexed previousOwner, address indexed newOwner); /** * @dev Initializes the contract setting the deployer as the initial owner. */ constructor () { address msgSender = _msgSender(); _owner = msgSender; emit OwnershipTransferred(address(0), msgSender); } /** * @dev Returns the address of the current owner. */ function owner() public view virtual returns (address) { return _owner; } /** * @dev Throws if called by any account other than the owner. */ modifier onlyOwner() { require(owner() == _msgSender(), "Ownable: caller is not the owner"); _; } /** * @dev Leaves the contract without owner. It will not be possible to call * `onlyOwner` functions anymore. Can only be called by the current owner. * * NOTE: Renouncing ownership will leave the contract without an owner, * thereby removing any functionality that is only available to the owner. */ function renounceOwnership() public virtual onlyOwner { emit OwnershipTransferred(_owner, address(0)); _owner = address(0); } /** * @dev Transfers ownership of the contract to a new account (`newOwner`). * Can only be called by the current owner. */ function transferOwnership(address newOwner) public virtual onlyOwner { require(newOwner != address(0), "Ownable: new owner is the zero address"); emit OwnershipTransferred(_owner, newOwner); _owner = newOwner; } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import "./IERC721.sol"; import "./IERC721Receiver.sol"; import "./extensions/IERC721Metadata.sol"; import "../../utils/Address.sol"; import "../../utils/Context.sol"; import "../../utils/Strings.sol"; import "../../utils/introspection/ERC165.sol"; /** * @dev Implementation of https://eips.ethereum.org/EIPS/eip-721[ERC721] Non-Fungible Token Standard, including * the Metadata extension, but not including the Enumerable extension, which is available separately as * {ERC721Enumerable}. */ contract ERC721 is Context, ERC165, IERC721, IERC721Metadata { using Address for address; using Strings for uint256; // Token name string private _name; // Token symbol string private _symbol; // Mapping from token ID to owner address mapping (uint256 => address) private _owners; // Mapping owner address to token count mapping (address => uint256) private _balances; // Mapping from token ID to approved address mapping (uint256 => address) private _tokenApprovals; // Mapping from owner to operator approvals mapping (address => mapping (address => bool)) private _operatorApprovals; /** * @dev Initializes the contract by setting a `name` and a `symbol` to the token collection. */ constructor (string memory name_, string memory symbol_) { _name = name_; _symbol = symbol_; } /** * @dev See {IERC165-supportsInterface}. */ function supportsInterface(bytes4 interfaceId) public view virtual override(ERC165, IERC165) returns (bool) { return interfaceId == type(IERC721).interfaceId || interfaceId == type(IERC721Metadata).interfaceId || super.supportsInterface(interfaceId); } /** * @dev See {IERC721-balanceOf}. */ function balanceOf(address owner) public view virtual override returns (uint256) { require(owner != address(0), "ERC721: balance query for the zero address"); return _balances[owner]; } /** * @dev See {IERC721-ownerOf}. */ function ownerOf(uint256 tokenId) public view virtual override returns (address) { address owner = _owners[tokenId]; require(owner != address(0), "ERC721: owner query for nonexistent token"); return owner; } /** * @dev See {IERC721Metadata-name}. */ function name() public view virtual override returns (string memory) { return _name; } /** * @dev See {IERC721Metadata-symbol}. */ function symbol() public view virtual override returns (string memory) { return _symbol; } /** * @dev See {IERC721Metadata-tokenURI}. */ function tokenURI(uint256 tokenId) public view virtual override returns (string memory) { require(_exists(tokenId), "ERC721Metadata: URI query for nonexistent token"); string memory baseURI = _baseURI(); return bytes(baseURI).length > 0 ? string(abi.encodePacked(baseURI, tokenId.toString())) : ''; } /** * @dev Base URI for computing {tokenURI}. Empty by default, can be overriden * in child contracts. */ function _baseURI() internal view virtual returns (string memory) { return ""; } /** * @dev See {IERC721-approve}. */ function approve(address to, uint256 tokenId) public virtual override { address owner = ERC721.ownerOf(tokenId); require(to != owner, "ERC721: approval to current owner"); require(_msgSender() == owner || isApprovedForAll(owner, _msgSender()), "ERC721: approve caller is not owner nor approved for all" ); _approve(to, tokenId); } /** * @dev See {IERC721-getApproved}. */ function getApproved(uint256 tokenId) public view virtual override returns (address) { require(_exists(tokenId), "ERC721: approved query for nonexistent token"); return _tokenApprovals[tokenId]; } /** * @dev See {IERC721-setApprovalForAll}. */ function setApprovalForAll(address operator, bool approved) public virtual override { require(operator != _msgSender(), "ERC721: approve to caller"); _operatorApprovals[_msgSender()][operator] = approved; emit ApprovalForAll(_msgSender(), operator, approved); } /** * @dev See {IERC721-isApprovedForAll}. */ function isApprovedForAll(address owner, address operator) public view virtual override returns (bool) { return _operatorApprovals[owner][operator]; } /** * @dev See {IERC721-transferFrom}. */ function transferFrom(address from, address to, uint256 tokenId) public virtual override { //solhint-disable-next-line max-line-length require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: transfer caller is not owner nor approved"); _transfer(from, to, tokenId); } /** * @dev See {IERC721-safeTransferFrom}. */ function safeTransferFrom(address from, address to, uint256 tokenId) public virtual override { safeTransferFrom(from, to, tokenId, ""); } /** * @dev See {IERC721-safeTransferFrom}. */ function safeTransferFrom(address from, address to, uint256 tokenId, bytes memory _data) public virtual override { require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: transfer caller is not owner nor approved"); _safeTransfer(from, to, tokenId, _data); } /** * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients * are aware of the ERC721 protocol to prevent tokens from being forever locked. * * `_data` is additional data, it has no specified format and it is sent in call to `to`. * * This internal function is equivalent to {safeTransferFrom}, and can be used to e.g. * implement alternative mechanisms to perform token transfer, such as signature-based. * * Requirements: * * - `from` cannot be the zero address. * - `to` cannot be the zero address. * - `tokenId` token must exist and be owned by `from`. * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer. * * Emits a {Transfer} event. */ function _safeTransfer(address from, address to, uint256 tokenId, bytes memory _data) internal virtual { _transfer(from, to, tokenId); require(_checkOnERC721Received(from, to, tokenId, _data), "ERC721: transfer to non ERC721Receiver implementer"); } /** * @dev Returns whether `tokenId` exists. * * Tokens can be managed by their owner or approved accounts via {approve} or {setApprovalForAll}. * * Tokens start existing when they are minted (`_mint`), * and stop existing when they are burned (`_burn`). */ function _exists(uint256 tokenId) internal view virtual returns (bool) { return _owners[tokenId] != address(0); } /** * @dev Returns whether `spender` is allowed to manage `tokenId`. * * Requirements: * * - `tokenId` must exist. */ function _isApprovedOrOwner(address spender, uint256 tokenId) internal view virtual returns (bool) { require(_exists(tokenId), "ERC721: operator query for nonexistent token"); address owner = ERC721.ownerOf(tokenId); return (spender == owner || getApproved(tokenId) == spender || isApprovedForAll(owner, spender)); } /** * @dev Safely mints `tokenId` and transfers it to `to`. * * Requirements: * * - `tokenId` must not exist. * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer. * * Emits a {Transfer} event. */ function _safeMint(address to, uint256 tokenId) internal virtual { _safeMint(to, tokenId, ""); } /** * @dev Same as {xref-ERC721-_safeMint-address-uint256-}[`_safeMint`], with an additional `data` parameter which is * forwarded in {IERC721Receiver-onERC721Received} to contract recipients. */ function _safeMint(address to, uint256 tokenId, bytes memory _data) internal virtual { _mint(to, tokenId); require(_checkOnERC721Received(address(0), to, tokenId, _data), "ERC721: transfer to non ERC721Receiver implementer"); } /** * @dev Mints `tokenId` and transfers it to `to`. * * WARNING: Usage of this method is discouraged, use {_safeMint} whenever possible * * Requirements: * * - `tokenId` must not exist. * - `to` cannot be the zero address. * * Emits a {Transfer} event. */ function _mint(address to, uint256 tokenId) internal virtual { require(to != address(0), "ERC721: mint to the zero address"); require(!_exists(tokenId), "ERC721: token already minted"); _beforeTokenTransfer(address(0), to, tokenId); _balances[to] += 1; _owners[tokenId] = to; emit Transfer(address(0), to, tokenId); } /** * @dev Destroys `tokenId`. * The approval is cleared when the token is burned. * * Requirements: * * - `tokenId` must exist. * * Emits a {Transfer} event. */ function _burn(uint256 tokenId) internal virtual { address owner = ERC721.ownerOf(tokenId); _beforeTokenTransfer(owner, address(0), tokenId); // Clear approvals _approve(address(0), tokenId); _balances[owner] -= 1; delete _owners[tokenId]; emit Transfer(owner, address(0), tokenId); } /** * @dev Transfers `tokenId` from `from` to `to`. * As opposed to {transferFrom}, this imposes no restrictions on msg.sender. * * Requirements: * * - `to` cannot be the zero address. * - `tokenId` token must be owned by `from`. * * Emits a {Transfer} event. */ function _transfer(address from, address to, uint256 tokenId) internal virtual { require(ERC721.ownerOf(tokenId) == from, "ERC721: transfer of token that is not own"); require(to != address(0), "ERC721: transfer to the zero address"); _beforeTokenTransfer(from, to, tokenId); // Clear approvals from the previous owner _approve(address(0), tokenId); _balances[from] -= 1; _balances[to] += 1; _owners[tokenId] = to; emit Transfer(from, to, tokenId); } /** * @dev Approve `to` to operate on `tokenId` * * Emits a {Approval} event. */ function _approve(address to, uint256 tokenId) internal virtual { _tokenApprovals[tokenId] = to; emit Approval(ERC721.ownerOf(tokenId), to, tokenId); } /** * @dev Internal function to invoke {IERC721Receiver-onERC721Received} on a target address. * The call is not executed if the target address is not a contract. * * @param from address representing the previous owner of the given token ID * @param to target address that will receive the tokens * @param tokenId uint256 ID of the token to be transferred * @param _data bytes optional data to send along with the call * @return bool whether the call correctly returned the expected magic value */ function _checkOnERC721Received(address from, address to, uint256 tokenId, bytes memory _data) private returns (bool) { if (to.isContract()) { try IERC721Receiver(to).onERC721Received(_msgSender(), from, tokenId, _data) returns (bytes4 retval) { return retval == IERC721Receiver(to).onERC721Received.selector; } catch (bytes memory reason) { if (reason.length == 0) { revert("ERC721: transfer to non ERC721Receiver implementer"); } else { // solhint-disable-next-line no-inline-assembly assembly { revert(add(32, reason), mload(reason)) } } } } else { return true; } } /** * @dev Hook that is called before any token transfer. This includes minting * and burning. * * Calling conditions: * * - When `from` and `to` are both non-zero, ``from``'s `tokenId` will be * transferred to `to`. * - When `from` is zero, `tokenId` will be minted for `to`. * - When `to` is zero, ``from``'s `tokenId` will be burned. * - `from` cannot be the zero address. * - `to` cannot be the zero address. * * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks]. */ function _beforeTokenTransfer(address from, address to, uint256 tokenId) internal virtual { } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import "../../utils/introspection/IERC165.sol"; /** * @dev Required interface of an ERC721 compliant contract. */ interface IERC721 is IERC165 { /** * @dev Emitted when `tokenId` token is transferred from `from` to `to`. */ event Transfer(address indexed from, address indexed to, uint256 indexed tokenId); /** * @dev Emitted when `owner` enables `approved` to manage the `tokenId` token. */ event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId); /** * @dev Emitted when `owner` enables or disables (`approved`) `operator` to manage all of its assets. */ event ApprovalForAll(address indexed owner, address indexed operator, bool approved); /** * @dev Returns the number of tokens in ``owner``'s account. */ function balanceOf(address owner) external view returns (uint256 balance); /** * @dev Returns the owner of the `tokenId` token. * * Requirements: * * - `tokenId` must exist. */ function ownerOf(uint256 tokenId) external view returns (address owner); /** * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients * are aware of the ERC721 protocol to prevent tokens from being forever locked. * * Requirements: * * - `from` cannot be the zero address. * - `to` cannot be the zero address. * - `tokenId` token must exist and be owned by `from`. * - If the caller is not `from`, it must be have been allowed to move this token by either {approve} or {setApprovalForAll}. * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer. * * Emits a {Transfer} event. */ function safeTransferFrom(address from, address to, uint256 tokenId) external; /** * @dev Transfers `tokenId` token from `from` to `to`. * * WARNING: Usage of this method is discouraged, use {safeTransferFrom} whenever possible. * * Requirements: * * - `from` cannot be the zero address. * - `to` cannot be the zero address. * - `tokenId` token must be owned by `from`. * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}. * * Emits a {Transfer} event. */ function transferFrom(address from, address to, uint256 tokenId) external; /** * @dev Gives permission to `to` to transfer `tokenId` token to another account. * The approval is cleared when the token is transferred. * * Only a single account can be approved at a time, so approving the zero address clears previous approvals. * * Requirements: * * - The caller must own the token or be an approved operator. * - `tokenId` must exist. * * Emits an {Approval} event. */ function approve(address to, uint256 tokenId) external; /** * @dev Returns the account approved for `tokenId` token. * * Requirements: * * - `tokenId` must exist. */ function getApproved(uint256 tokenId) external view returns (address operator); /** * @dev Approve or remove `operator` as an operator for the caller. * Operators can call {transferFrom} or {safeTransferFrom} for any token owned by the caller. * * Requirements: * * - The `operator` cannot be the caller. * * Emits an {ApprovalForAll} event. */ function setApprovalForAll(address operator, bool _approved) external; /** * @dev Returns if the `operator` is allowed to manage all of the assets of `owner`. * * See {setApprovalForAll} */ function isApprovedForAll(address owner, address operator) external view returns (bool); /** * @dev Safely transfers `tokenId` token from `from` to `to`. * * Requirements: * * - `from` cannot be the zero address. * - `to` cannot be the zero address. * - `tokenId` token must exist and be owned by `from`. * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}. * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer. * * Emits a {Transfer} event. */ function safeTransferFrom(address from, address to, uint256 tokenId, bytes calldata data) external; }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; /** * @title ERC721 token receiver interface * @dev Interface for any contract that wants to support safeTransfers * from ERC721 asset contracts. */ interface IERC721Receiver { /** * @dev Whenever an {IERC721} `tokenId` token is transferred to this contract via {IERC721-safeTransferFrom} * by `operator` from `from`, this function is called. * * It must return its Solidity selector to confirm the token transfer. * If any other value is returned or the interface is not implemented by the recipient, the transfer will be reverted. * * The selector can be obtained in Solidity with `IERC721.onERC721Received.selector`. */ function onERC721Received(address operator, address from, uint256 tokenId, bytes calldata data) external returns (bytes4); }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import "../ERC721.sol"; import "./IERC721Enumerable.sol"; /** * @dev This implements an optional extension of {ERC721} defined in the EIP that adds * enumerability of all the token ids in the contract as well as all token ids owned by each * account. */ abstract contract ERC721Enumerable is ERC721, IERC721Enumerable { // Mapping from owner to list of owned token IDs mapping(address => mapping(uint256 => uint256)) private _ownedTokens; // Mapping from token ID to index of the owner tokens list mapping(uint256 => uint256) private _ownedTokensIndex; // Array with all token ids, used for enumeration uint256[] private _allTokens; // Mapping from token id to position in the allTokens array mapping(uint256 => uint256) private _allTokensIndex; /** * @dev See {IERC165-supportsInterface}. */ function supportsInterface(bytes4 interfaceId) public view virtual override(IERC165, ERC721) returns (bool) { return interfaceId == type(IERC721Enumerable).interfaceId || super.supportsInterface(interfaceId); } /** * @dev See {IERC721Enumerable-tokenOfOwnerByIndex}. */ function tokenOfOwnerByIndex(address owner, uint256 index) public view virtual override returns (uint256) { require(index < ERC721.balanceOf(owner), "ERC721Enumerable: owner index out of bounds"); return _ownedTokens[owner][index]; } /** * @dev See {IERC721Enumerable-totalSupply}. */ function totalSupply() public view virtual override returns (uint256) { return _allTokens.length; } /** * @dev See {IERC721Enumerable-tokenByIndex}. */ function tokenByIndex(uint256 index) public view virtual override returns (uint256) { require(index < ERC721Enumerable.totalSupply(), "ERC721Enumerable: global index out of bounds"); return _allTokens[index]; } /** * @dev Hook that is called before any token transfer. This includes minting * and burning. * * Calling conditions: * * - When `from` and `to` are both non-zero, ``from``'s `tokenId` will be * transferred to `to`. * - When `from` is zero, `tokenId` will be minted for `to`. * - When `to` is zero, ``from``'s `tokenId` will be burned. * - `from` cannot be the zero address. * - `to` cannot be the zero address. * * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks]. */ function _beforeTokenTransfer(address from, address to, uint256 tokenId) internal virtual override { super._beforeTokenTransfer(from, to, tokenId); if (from == address(0)) { _addTokenToAllTokensEnumeration(tokenId); } else if (from != to) { _removeTokenFromOwnerEnumeration(from, tokenId); } if (to == address(0)) { _removeTokenFromAllTokensEnumeration(tokenId); } else if (to != from) { _addTokenToOwnerEnumeration(to, tokenId); } } /** * @dev Private function to add a token to this extension's ownership-tracking data structures. * @param to address representing the new owner of the given token ID * @param tokenId uint256 ID of the token to be added to the tokens list of the given address */ function _addTokenToOwnerEnumeration(address to, uint256 tokenId) private { uint256 length = ERC721.balanceOf(to); _ownedTokens[to][length] = tokenId; _ownedTokensIndex[tokenId] = length; } /** * @dev Private function to add a token to this extension's token tracking data structures. * @param tokenId uint256 ID of the token to be added to the tokens list */ function _addTokenToAllTokensEnumeration(uint256 tokenId) private { _allTokensIndex[tokenId] = _allTokens.length; _allTokens.push(tokenId); } /** * @dev Private function to remove a token from this extension's ownership-tracking data structures. Note that * while the token is not assigned a new owner, the `_ownedTokensIndex` mapping is _not_ updated: this allows for * gas optimizations e.g. when performing a transfer operation (avoiding double writes). * This has O(1) time complexity, but alters the order of the _ownedTokens array. * @param from address representing the previous owner of the given token ID * @param tokenId uint256 ID of the token to be removed from the tokens list of the given address */ function _removeTokenFromOwnerEnumeration(address from, uint256 tokenId) private { // To prevent a gap in from's tokens array, we store the last token in the index of the token to delete, and // then delete the last slot (swap and pop). uint256 lastTokenIndex = ERC721.balanceOf(from) - 1; uint256 tokenIndex = _ownedTokensIndex[tokenId]; // When the token to delete is the last token, the swap operation is unnecessary if (tokenIndex != lastTokenIndex) { uint256 lastTokenId = _ownedTokens[from][lastTokenIndex]; _ownedTokens[from][tokenIndex] = lastTokenId; // Move the last token to the slot of the to-delete token _ownedTokensIndex[lastTokenId] = tokenIndex; // Update the moved token's index } // This also deletes the contents at the last position of the array delete _ownedTokensIndex[tokenId]; delete _ownedTokens[from][lastTokenIndex]; } /** * @dev Private function to remove a token from this extension's token tracking data structures. * This has O(1) time complexity, but alters the order of the _allTokens array. * @param tokenId uint256 ID of the token to be removed from the tokens list */ function _removeTokenFromAllTokensEnumeration(uint256 tokenId) private { // To prevent a gap in the tokens array, we store the last token in the index of the token to delete, and // then delete the last slot (swap and pop). uint256 lastTokenIndex = _allTokens.length - 1; uint256 tokenIndex = _allTokensIndex[tokenId]; // When the token to delete is the last token, the swap operation is unnecessary. However, since this occurs so // rarely (when the last minted token is burnt) that we still do the swap here to avoid the gas cost of adding // an 'if' statement (like in _removeTokenFromOwnerEnumeration) uint256 lastTokenId = _allTokens[lastTokenIndex]; _allTokens[tokenIndex] = lastTokenId; // Move the last token to the slot of the to-delete token _allTokensIndex[lastTokenId] = tokenIndex; // Update the moved token's index // This also deletes the contents at the last position of the array delete _allTokensIndex[tokenId]; _allTokens.pop(); } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import "../IERC721.sol"; /** * @title ERC-721 Non-Fungible Token Standard, optional enumeration extension * @dev See https://eips.ethereum.org/EIPS/eip-721 */ interface IERC721Enumerable is IERC721 { /** * @dev Returns the total amount of tokens stored by the contract. */ function totalSupply() external view returns (uint256); /** * @dev Returns a token ID owned by `owner` at a given `index` of its token list. * Use along with {balanceOf} to enumerate all of ``owner``'s tokens. */ function tokenOfOwnerByIndex(address owner, uint256 index) external view returns (uint256 tokenId); /** * @dev Returns a token ID at a given `index` of all the tokens stored by the contract. * Use along with {totalSupply} to enumerate all tokens. */ function tokenByIndex(uint256 index) external view returns (uint256); }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import "../IERC721.sol"; /** * @title ERC-721 Non-Fungible Token Standard, optional metadata extension * @dev See https://eips.ethereum.org/EIPS/eip-721 */ interface IERC721Metadata is IERC721 { /** * @dev Returns the token collection name. */ function name() external view returns (string memory); /** * @dev Returns the token collection symbol. */ function symbol() external view returns (string memory); /** * @dev Returns the Uniform Resource Identifier (URI) for `tokenId` token. */ function tokenURI(uint256 tokenId) external view returns (string memory); }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; /** * @dev Collection of functions related to the address type */ library Address { /** * @dev Returns true if `account` is a contract. * * [IMPORTANT] * ==== * It is unsafe to assume that an address for which this function returns * false is an externally-owned account (EOA) and not a contract. * * Among others, `isContract` will return false for the following * types of addresses: * * - an externally-owned account * - a contract in construction * - an address where a contract will be created * - an address where a contract lived, but was destroyed * ==== */ function isContract(address account) internal view returns (bool) { // This method relies on extcodesize, which returns 0 for contracts in // construction, since the code is only stored at the end of the // constructor execution. uint256 size; // solhint-disable-next-line no-inline-assembly assembly { size := extcodesize(account) } return size > 0; } /** * @dev Replacement for Solidity's `transfer`: sends `amount` wei to * `recipient`, forwarding all available gas and reverting on errors. * * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost * of certain opcodes, possibly making contracts go over the 2300 gas limit * imposed by `transfer`, making them unable to receive funds via * `transfer`. {sendValue} removes this limitation. * * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more]. * * IMPORTANT: because control is transferred to `recipient`, care must be * taken to not create reentrancy vulnerabilities. Consider using * {ReentrancyGuard} or the * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern]. */ function sendValue(address payable recipient, uint256 amount) internal { require(address(this).balance >= amount, "Address: insufficient balance"); // solhint-disable-next-line avoid-low-level-calls, avoid-call-value (bool success, ) = recipient.call{ value: amount }(""); require(success, "Address: unable to send value, recipient may have reverted"); } /** * @dev Performs a Solidity function call using a low level `call`. A * plain`call` is an unsafe replacement for a function call: use this * function instead. * * If `target` reverts with a revert reason, it is bubbled up by this * function (like regular Solidity function calls). * * Returns the raw returned data. To convert to the expected return value, * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`]. * * Requirements: * * - `target` must be a contract. * - calling `target` with `data` must not revert. * * _Available since v3.1._ */ function functionCall(address target, bytes memory data) internal returns (bytes memory) { return functionCall(target, data, "Address: low-level call failed"); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with * `errorMessage` as a fallback revert reason when `target` reverts. * * _Available since v3.1._ */ function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) { return functionCallWithValue(target, data, 0, errorMessage); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], * but also transferring `value` wei to `target`. * * Requirements: * * - the calling contract must have an ETH balance of at least `value`. * - the called Solidity function must be `payable`. * * _Available since v3.1._ */ function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) { return functionCallWithValue(target, data, value, "Address: low-level call with value failed"); } /** * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but * with `errorMessage` as a fallback revert reason when `target` reverts. * * _Available since v3.1._ */ function functionCallWithValue(address target, bytes memory data, uint256 value, string memory errorMessage) internal returns (bytes memory) { require(address(this).balance >= value, "Address: insufficient balance for call"); require(isContract(target), "Address: call to non-contract"); // solhint-disable-next-line avoid-low-level-calls (bool success, bytes memory returndata) = target.call{ value: value }(data); return _verifyCallResult(success, returndata, errorMessage); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], * but performing a static call. * * _Available since v3.3._ */ function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) { return functionStaticCall(target, data, "Address: low-level static call failed"); } /** * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`], * but performing a static call. * * _Available since v3.3._ */ function functionStaticCall(address target, bytes memory data, string memory errorMessage) internal view returns (bytes memory) { require(isContract(target), "Address: static call to non-contract"); // solhint-disable-next-line avoid-low-level-calls (bool success, bytes memory returndata) = target.staticcall(data); return _verifyCallResult(success, returndata, errorMessage); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], * but performing a delegate call. * * _Available since v3.4._ */ function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) { return functionDelegateCall(target, data, "Address: low-level delegate call failed"); } /** * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`], * but performing a delegate call. * * _Available since v3.4._ */ function functionDelegateCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) { require(isContract(target), "Address: delegate call to non-contract"); // solhint-disable-next-line avoid-low-level-calls (bool success, bytes memory returndata) = target.delegatecall(data); return _verifyCallResult(success, returndata, errorMessage); } function _verifyCallResult(bool success, bytes memory returndata, string memory errorMessage) private pure returns(bytes memory) { if (success) { return returndata; } else { // Look for revert reason and bubble it up if present if (returndata.length > 0) { // The easiest way to bubble the revert reason is using memory via assembly // solhint-disable-next-line no-inline-assembly assembly { let returndata_size := mload(returndata) revert(add(32, returndata), returndata_size) } } else { revert(errorMessage); } } } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; /* * @dev Provides information about the current execution context, including the * sender of the transaction and its data. While these are generally available * via msg.sender and msg.data, they should not be accessed in such a direct * manner, since when dealing with meta-transactions the account sending and * paying for execution may not be the actual sender (as far as an application * is concerned). * * This contract is only required for intermediate, library-like contracts. */ abstract contract Context { function _msgSender() internal view virtual returns (address) { return msg.sender; } function _msgData() internal view virtual returns (bytes calldata) { this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691 return msg.data; } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; /** * @dev String operations. */ library Strings { bytes16 private constant alphabet = "0123456789abcdef"; /** * @dev Converts a `uint256` to its ASCII `string` decimal representation. */ function toString(uint256 value) internal pure returns (string memory) { // Inspired by OraclizeAPI's implementation - MIT licence // https://github.com/oraclize/ethereum-api/blob/b42146b063c7d6ee1358846c198246239e9360e8/oraclizeAPI_0.4.25.sol if (value == 0) { return "0"; } uint256 temp = value; uint256 digits; while (temp != 0) { digits++; temp /= 10; } bytes memory buffer = new bytes(digits); while (value != 0) { digits -= 1; buffer[digits] = bytes1(uint8(48 + uint256(value % 10))); value /= 10; } return string(buffer); } /** * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation. */ function toHexString(uint256 value) internal pure returns (string memory) { if (value == 0) { return "0x00"; } uint256 temp = value; uint256 length = 0; while (temp != 0) { length++; temp >>= 8; } return toHexString(value, length); } /** * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length. */ function toHexString(uint256 value, uint256 length) internal pure returns (string memory) { bytes memory buffer = new bytes(2 * length + 2); buffer[0] = "0"; buffer[1] = "x"; for (uint256 i = 2 * length + 1; i > 1; --i) { buffer[i] = alphabet[value & 0xf]; value >>= 4; } require(value == 0, "Strings: hex length insufficient"); return string(buffer); } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import "./IERC165.sol"; /** * @dev Implementation of the {IERC165} interface. * * Contracts that want to implement ERC165 should inherit from this contract and override {supportsInterface} to check * for the additional interface id that will be supported. For example: * * ```solidity * function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) { * return interfaceId == type(MyInterface).interfaceId || super.supportsInterface(interfaceId); * } * ``` * * Alternatively, {ERC165Storage} provides an easier to use but more expensive implementation. */ abstract contract ERC165 is IERC165 { /** * @dev See {IERC165-supportsInterface}. */ function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) { return interfaceId == type(IERC165).interfaceId; } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; /** * @dev Interface of the ERC165 standard, as defined in the * https://eips.ethereum.org/EIPS/eip-165[EIP]. * * Implementers can declare support of contract interfaces, which can then be * queried by others ({ERC165Checker}). * * For an implementation, see {ERC165}. */ interface IERC165 { /** * @dev Returns true if this contract implements the interface defined by * `interfaceId`. See the corresponding * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section] * to learn more about how these ids are created. * * This function call must use less than 30 000 gas. */ function supportsInterface(bytes4 interfaceId) external view returns (bool); }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; // CAUTION // This version of SafeMath should only be used with Solidity 0.8 or later, // because it relies on the compiler's built in overflow checks. /** * @dev Wrappers over Solidity's arithmetic operations. * * NOTE: `SafeMath` is no longer needed starting with Solidity 0.8. The compiler * now has built in overflow checking. */ library SafeMath { /** * @dev Returns the addition of two unsigned integers, with an overflow flag. * * _Available since v3.4._ */ function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) { unchecked { uint256 c = a + b; if (c < a) return (false, 0); return (true, c); } } /** * @dev Returns the substraction of two unsigned integers, with an overflow flag. * * _Available since v3.4._ */ function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) { unchecked { if (b > a) return (false, 0); return (true, a - b); } } /** * @dev Returns the multiplication of two unsigned integers, with an overflow flag. * * _Available since v3.4._ */ function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) { unchecked { // Gas optimization: this is cheaper than requiring 'a' not being zero, but the // benefit is lost if 'b' is also tested. // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522 if (a == 0) return (true, 0); uint256 c = a * b; if (c / a != b) return (false, 0); return (true, c); } } /** * @dev Returns the division of two unsigned integers, with a division by zero flag. * * _Available since v3.4._ */ function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) { unchecked { if (b == 0) return (false, 0); return (true, a / b); } } /** * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag. * * _Available since v3.4._ */ function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) { unchecked { if (b == 0) return (false, 0); return (true, a % b); } } /** * @dev Returns the addition of two unsigned integers, reverting on * overflow. * * Counterpart to Solidity's `+` operator. * * Requirements: * * - Addition cannot overflow. */ function add(uint256 a, uint256 b) internal pure returns (uint256) { return a + b; } /** * @dev Returns the subtraction of two unsigned integers, reverting on * overflow (when the result is negative). * * Counterpart to Solidity's `-` operator. * * Requirements: * * - Subtraction cannot overflow. */ function sub(uint256 a, uint256 b) internal pure returns (uint256) { return a - b; } /** * @dev Returns the multiplication of two unsigned integers, reverting on * overflow. * * Counterpart to Solidity's `*` operator. * * Requirements: * * - Multiplication cannot overflow. */ function mul(uint256 a, uint256 b) internal pure returns (uint256) { return a * b; } /** * @dev Returns the integer division of two unsigned integers, reverting on * division by zero. The result is rounded towards zero. * * Counterpart to Solidity's `/` operator. * * Requirements: * * - The divisor cannot be zero. */ function div(uint256 a, uint256 b) internal pure returns (uint256) { return a / b; } /** * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo), * reverting when dividing by zero. * * Counterpart to Solidity's `%` operator. This function uses a `revert` * opcode (which leaves remaining gas untouched) while Solidity uses an * invalid opcode to revert (consuming all remaining gas). * * Requirements: * * - The divisor cannot be zero. */ function mod(uint256 a, uint256 b) internal pure returns (uint256) { return a % b; } /** * @dev Returns the subtraction of two unsigned integers, reverting with custom message on * overflow (when the result is negative). * * CAUTION: This function is deprecated because it requires allocating memory for the error * message unnecessarily. For custom revert reasons use {trySub}. * * Counterpart to Solidity's `-` operator. * * Requirements: * * - Subtraction cannot overflow. */ function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) { unchecked { require(b <= a, errorMessage); return a - b; } } /** * @dev Returns the integer division of two unsigned integers, reverting with custom message on * division by zero. The result is rounded towards zero. * * Counterpart to Solidity's `%` operator. This function uses a `revert` * opcode (which leaves remaining gas untouched) while Solidity uses an * invalid opcode to revert (consuming all remaining gas). * * Counterpart to Solidity's `/` operator. Note: this function uses a * `revert` opcode (which leaves remaining gas untouched) while Solidity * uses an invalid opcode to revert (consuming all remaining gas). * * Requirements: * * - The divisor cannot be zero. */ function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) { unchecked { require(b > 0, errorMessage); return a / b; } } /** * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo), * reverting with custom message when dividing by zero. * * CAUTION: This function is deprecated because it requires allocating memory for the error * message unnecessarily. For custom revert reasons use {tryMod}. * * Counterpart to Solidity's `%` operator. This function uses a `revert` * opcode (which leaves remaining gas untouched) while Solidity uses an * invalid opcode to revert (consuming all remaining gas). * * Requirements: * * - The divisor cannot be zero. */ function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) { unchecked { require(b > 0, errorMessage); return a % b; } } }
{ "remappings": [], "optimizer": { "enabled": true, "runs": 20 }, "evmVersion": "london", "libraries": {}, "outputSelection": { "*": { "*": [ "evm.bytecode", "evm.deployedBytecode", "abi" ] } } }
Contract Security Audit
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npayable","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"safeTransferFrom","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"},{"internalType":"bytes","name":"_data","type":"bytes"}],"name":"safeTransferFrom","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"operator","type":"address"},{"internalType":"bool","name":"approved","type":"bool"}],"name":"setApprovalForAll","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes4","name":"interfaceId","type":"bytes4"}],"name":"supportsInterface","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"symbol","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"index","type":"uint256"}],"name":"tokenByIndex","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"owner","type":"address"},{"internalType":"uint256","name":"index","type":"uint256"}],"name":"tokenOfOwnerByIndex","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_tokenId","type":"uint256"}],"name":"tokenURI","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"pure","type":"function"},{"inputs":[],"name":"totalSupply","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"transferFrom","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"}]
Contract Creation Code
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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)
000000000000000000000000a5409ec958c83c3f309868babaca7c86dcb077c1
-----Decoded View---------------
Arg [0] : _proxyRegistryAddress (address): 0xa5409ec958C83C3f309868babACA7c86DCB077c1
-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 000000000000000000000000a5409ec958c83c3f309868babaca7c86dcb077c1
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