ERC-721
Overview
Max Total Supply
0 RING
Holders
343
Market
Volume (24H)
N/A
Min Price (24H)
N/A
Max Price (24H)
N/A
Other Info
Token Contract
Balance
3 RINGLoading...
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# | Exchange | Pair | Price | 24H Volume | % Volume |
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Contract Name:
DichoStudio0xCarat
Compiler Version
v0.8.6+commit.11564f7e
Optimization Enabled:
Yes with 200 runs
Other Settings:
default evmVersion
Contract Source Code (Solidity Standard Json-Input format)
// SPDX-License-Identifier: MIT pragma solidity ^0.8.6; // **** ****** ** // *///** **////** /** // /* */* ** ** ** // ****** ****** ****** ****** // /* * /*//** ** /** //////** //**//* //////** ///**/ // /** /* //*** /** ******* /** / ******* /** // /* /* **/** //** ** **////** /** **////** /** // / **** ** //** //****** //********/*** //******** //** // //// // // ////// //////// /// //////// // import "@openzeppelin/contracts/token/ERC721/ERC721.sol"; import "@openzeppelin/contracts/access/Ownable.sol"; import "@openzeppelin/contracts/security/ReentrancyGuard.sol"; import "@openzeppelin/contracts/utils/Counters.sol"; import "@openzeppelin/contracts/utils/math/SafeMath.sol"; /** * @title DichoStudio 0xCarat * @author codesza, adapted from NPassCore.sol, NDerivative.sol, Voyagerz.sol, and CryptoCoven.sol * and inspired by Vows and Runners: Next Generation */ contract DichoStudio0xCarat is ERC721, Ownable, ReentrancyGuard { using Strings for uint256; using Counters for Counters.Counter; /// @notice A counter for tokens Counters.Counter private _tokenIds; uint256 private constant _maxPublicSupply = 888; uint256 private constant _maxRingsPerWallet = 3; uint256 public saleStartTimestamp; address private openSeaProxyRegistryAddress; /// @notice Records of crafter- and wearer- derived seeds mapping(uint256 => uint256) private _ringSeed; mapping(uint256 => uint256) private _wearerSeed; /// @notice Recordkeeping beyond balanceOf mapping(address => uint256) private _crafterBalance; constructor(address _openSeaProxyRegistryAddress) ERC721("Dicho Studio 0xCarat", "RING") { openSeaProxyRegistryAddress = _openSeaProxyRegistryAddress; } /// @notice Craft rings, a.k.a. mint function craft(uint256 numToMint) external nonReentrant { require(isSaleOpen(), "Sale not open"); require(numToMint > 0 && numToMint <= mintsAvailable(), "Out of rings"); require( _crafterBalance[msg.sender] + numToMint <= _maxRingsPerWallet, "Max rings to craft is three" ); uint256 tokenId; for (uint256 i = 0; i < numToMint; i++) { _tokenIds.increment(); tokenId = _tokenIds.current(); _safeMint(msg.sender, tokenId); _ringSeed[tokenId] = randSeed(msg.sender, tokenId, 13999234923493293432397); _wearerSeed[tokenId] = _ringSeed[tokenId]; } _crafterBalance[msg.sender] += numToMint; } /// @notice Gift rings using safeTransferFrom function gift(address to, uint256 tokenId) external nonReentrant { require(ownerOf(tokenId) == msg.sender, "Gift a ring you own"); safeTransferFrom(msg.sender, to, tokenId); } /// @notice To divorce, burn the ring. function divorce(uint256 tokenId) external nonReentrant { require(ownerOf(tokenId) == msg.sender, "Burn a ring you own"); _burn(tokenId); } /// @notice Is it time yet? function isSaleOpen() public view returns (bool) { return block.timestamp >= saleStartTimestamp && saleStartTimestamp != 0; } /// @notice Calculate available open mints function mintsAvailable() public view returns (uint256) { return _maxPublicSupply - _tokenIds.current(); } // ============ OWNER ONLY ROUTINES ============ /// @notice Allows owner to withdraw amount function withdrawAll() external onlyOwner { uint256 balance = address(this).balance; payable(msg.sender).transfer(balance); } /// @notice Allows owner to change sale time start function setSaleTimestamp(uint256 timestamp) external onlyOwner { saleStartTimestamp = timestamp; } // ============ HELPER FUNCTIONS / UTILS ============ /// @notice Random seed generation, from Voyagerz contract function randSeed(address addr, uint256 tokenId, uint256 modulus) internal view returns (uint256) { return uint256(keccak256(abi.encodePacked(addr, block.timestamp, block.difficulty, tokenId))) % modulus; } function toString(uint256 value) internal pure returns (string memory) { // Inspired by OraclizeAPI's implementation - MIT license // 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); } function correctColor(uint256 hue, uint256 sat, uint256 lum, uint256 seed) internal pure returns (uint256, uint256) { if (hue <= 55 && hue >= 27 && sat < 66 && lum < 49) { sat = 70; lum = (seed % 33) + 48; } return (sat, lum); } // ============ RING CONSTRUCTION ============ /// @notice Baseline parameters for a ring struct RingParams { uint256 gemcol_h; uint256 gemcol_s; uint256 gemcol_l; uint256 bgcol_h; uint256 bgcol_s; uint256 cut_idx; uint256 band_idx; string bandcol; } /// @notice Using wearer and crafter seeds to define ring parameters function getRingParams(uint256 tokenId) internal view returns (RingParams memory) { RingParams memory rp; { uint256 rSeed = _ringSeed[tokenId]; // gem color derived from minter-derived seed. still influences ethereum cut rp.gemcol_h = rSeed % 335; rSeed = rSeed >> 8; rp.gemcol_s = ((rSeed & 0xFF) % 40) + 40; // (40, 80) rSeed = rSeed >> 8; rp.gemcol_l = ((rSeed & 0xFF) % 50) + 30; // (30, 80) rSeed = rSeed >> 8; (rp.gemcol_s, rp.gemcol_l) = correctColor(rp.gemcol_h, rp.gemcol_s, rp.gemcol_l, rSeed); // gem cut and ring band color if ((rSeed & 0xFF) < 8) { // 8/255 = ~3% chance of "ethereum" cut rp.cut_idx = 0; } else if ((rSeed & 0xFF) < 59) { // between 8 and 59 / 255 = ~20% chance of emerald cut rp.cut_idx = 2; } else if ((rSeed & 0xFF) < 148) { // between 59 and 148 / 255 = ~35% chance of solitaire cut rp.cut_idx = 3; } else { rp.cut_idx = 1; // round } rSeed = rSeed >> 8; if ((rSeed & 0xFF) < 26) { // <26/255 = ~10% chance of rose gold band rp.bandcol = "#C48891"; rp.band_idx = 0; } else if ((rSeed & 0xFF) < 115) { // between 26 and 115 / 255 = 35% chance of platinum band rp.bandcol = "#C4C4C4"; rp.band_idx = 1; } else { rp.bandcol = "#D7BB59"; rp.band_idx = 2; } if (_wearerSeed[tokenId] != _ringSeed[tokenId]) { uint256 wSeed = _wearerSeed[tokenId]; rp.bgcol_h = wSeed % 335; wSeed = wSeed >> 8; (rp.bgcol_s,) = correctColor(rp.bgcol_h, ((wSeed & 0xFF) % 35) + 35, 35, 0); // (35, 70) } else { rp.bgcol_h = rp.gemcol_h; rp.bgcol_s = rp.gemcol_s; if (rp.band_idx == 2 && rp.gemcol_h < 48 && rp.gemcol_h > 27) { rp.band_idx = 1; rp.bandcol = "#C4C4C4"; } } } return rp; } /// @notice Constructing the ring's svg using its parameters function getSvg(uint256 tokenId) internal view returns (bytes memory, RingParams memory) { RingParams memory rp = getRingParams(tokenId); bytes memory buf; { buf = abi.encodePacked( '<svg width="500" height="500" xmlns="http://www.w3.org/2000/svg">' "<defs>" ); if (rp.cut_idx == 0) { buf = abi.encodePacked( buf, '<radialGradient id="b" r="2" cy="100%" cx="30%" fx="100%" fy="10%">' '<stop stop-color="#7FDEFF"/>' '<stop offset=".19" stop-color="#CFC7FA" stop-opacity=".8"/>' '<stop offset=".23" stop-color="#CED9ED" stop-opacity=".79"/>' '<stop offset=".32" stop-opacity="1" stop-color="hsl(', toString(rp.gemcol_h), ",", toString(rp.gemcol_s), "%,", toString(rp.gemcol_l), '%)" />' '<stop stop-color="#EFC8DD" offset=".33" stop-opacity=".6"/>' '<stop stop-color="#CED9ED" offset=".4" stop-opacity=".8"/>' '</radialGradient>' ); } else { if (rp.cut_idx == 3) { buf = abi.encodePacked( buf, '<radialGradient id="b" cx="1.6" cy="0" r="1" fy="0.6" spreadMethod="reflect" gradientUnits="userSpaceOnUse" gradientTransform="' 'matrix(0 45.7397 -53.6119 0 250 165)">' ); } else if (rp.cut_idx == 2) { buf = abi.encodePacked( buf, '<radialGradient id="b" spreadMethod="reflect" fy="1" r="1" cy="0" cx="1.6" gradientTransform="' 'rotate(179.48 125.62 79.01) scale(177.459 42.9393)" gradientUnits="userSpaceOnUse">' ); } else { buf = abi.encodePacked( buf, '<radialGradient id="b" gradientUnits="userSpaceOnUse" gradientTransform="' 'matrix(0 -100 60 0 249.9 161.75)" spreadMethod="reflect" fy="0.9" r="1" cy="0" cx="1.7">' ); } buf = abi.encodePacked( buf, '<stop stop-color="hsl(', toString(rp.gemcol_h + 25), ",", toString(rp.gemcol_s + 20), "%,", toString(rp.gemcol_l + 10), '%)"/>' '<stop offset="1" stop-color="hsl(', toString(rp.gemcol_h), ",", toString(rp.gemcol_s), "%,", toString(rp.gemcol_l), '%)" stop-opacity="0.4" />' '</radialGradient>' ); } } { buf = abi.encodePacked( buf, '<filter id="a" x="0" y="0" width="100%" height="100%" ' 'filterUnits="userSpaceOnUse" color-interpolation-filters="sRGB">' '<feFlood flood-opacity="0" result="BackgroundImageFix"/>' '<feColorMatrix in="SourceAlpha" values="0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 127 0" result="hardAlpha"/>' '<feOffset xmlns="http://www.w3.org/2000/svg" dy="3" dx="3" />' '<feComposite in2="hardAlpha" operator="out"/>' '<feColorMatrix values="0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0.25 0"/>' '<feBlend in2="BackgroundImageFix" result="effect1_dropShadow"/>' '<feBlend in="SourceGraphic" in2="effect1_dropShadow" result="shape"/>' '<feGaussianBlur stdDeviation="2" result="blur1"/>' '<feSpecularLighting result="spec1" in="blur1" specularExponent="70" lighting-color="hsl(', toString(rp.bgcol_h + 25), ",", toString(rp.bgcol_s + 20), "%, ", toString((rp.bgcol_h + 25) < 210 ? 35 : (rp.bgcol_h + 25) < 330 ? 65 : 80), '%)">' '<fePointLight x="140" y="150" z="300" /></feSpecularLighting>' '<feComposite in="SourceGraphic" in2="spec1" operator="arithmetic" k1="0" k2="1" k3="1" k4="0" />' "</filter>" ); buf = abi.encodePacked( buf, '<radialGradient id="bg" cx="0.4" cy="0.32" r="2.5">' '<stop offset="0%" stop-color="hsl(', toString(rp.bgcol_h), ",", toString(rp.bgcol_s), '%, 40%)" />' '<stop offset="20%" stop-color="hsl(', toString(rp.bgcol_h), ",", toString(rp.bgcol_s), '%, 22%)" />' '<stop offset="60%" stop-color="hsl(', toString(rp.bgcol_h), ",", toString(rp.bgcol_s), '%, 10%)" />' "</radialGradient>" "</defs>" ); } buf = abi.encodePacked( buf, '<rect x="0" y="0" width="100%" height="100%" fill="url(#bg)" />' '<g filter="url(#a)">' '<path d="M249.5 343c-37.3 0-67.5-30.2-67.5-67.5s30.2-67.5 67.5-67.5 67.5 30.2 67.5 67.5-30.2 67.5-67.5 67.5Z" ' 'stroke="', rp.bandcol, '" stroke-width="13.8" fill="none"/>' ); { if (rp.cut_idx == 0) { // eth cut buf = abi.encodePacked( buf, '<path d="M249.3 113.8c-.2.4-5.4 9.3-11.7 19.6-6.3 10.4-11.4 19-11.5 19.2-.1.2 3.3 2.3 11.9 7.4l12 7.1 ' '12-7.1c8.6-5.1 12-7.2 11.9-7.4-.4-1.1-23.8-39.6-24.1-39.6-.1 0-.4.3-.5.8Zm-23.2 43.9c.5.8 23.8 33.7 23.9 ' '33.7.2 0 24.1-33.8 24-33.9-.1-.1-22.4 13.1-23.4 13.8l-.6.4-11.6-6.8c-6.4-3.8-11.8-7-12.1-7.2-.3-.3-.4-.3-.2 0Z" fill="url(#b)"/>' '<path fill-rule="evenodd" clip-rule="evenodd" d="m237 179 13 17.1 13-17.1 3.5-5 .3-.3c.3-.3.7-.1.7.3v.1l-7 16-5 ' '12.5h-11l-5-12.5-7-16v-.1c0-.4.4-.6.7-.3l.3.3 3.5 5Z" fill="', rp.bandcol, '"/></g></svg>' ); } else if (rp.cut_idx == 1) { // round buf = abi.encodePacked( buf, '<path d="M210 164.9a34.76 34.76 0 0 1 33.9-34.75l6.1-.15 6.1.15A34.76 34.76 0 0 1 290 164.9c0 1.31-.66 ' '2.53-1.76 3.24l-36.06 23.44a4 4 0 0 1-4.36 0l-36.06-23.44a3.86 3.86 0 0 1-1.76-3.24Z" fill="url(#b)"/>' '<path fill-rule="evenodd" clip-rule="evenodd" d="M210.49 167.01 250 192.23l39.51-25.22a4.86 4.86 0 0 1 ' '5.9.53c.85.78.84 2.12-.03 2.88L259 202.5l-9-.5-9 .5-36.38-32.08a1.94 1.94 0 0 1-.04-2.88 4.86 4.86 0 0 1 5.9-.53Z" ' 'fill="', rp.bandcol, '"/></g></svg>' ); } else if (rp.cut_idx == 2) { // emerald buf = abi.encodePacked( buf, '<path d="M241.1 191h30.2l14.9-10 13.6-9.6c.9-.6 1.8-1.4 2.5-2.2l6.9-7.6 6.8-9.6c.3-.4.5-.9.5-1.4v-.4c0-.9-.2-1.8-' '.7-2.6l-2.9-4.8c-1.8-3-5.1-4.8-8.6-4.8H198.7c-3.5 0-6.8 1.8-8.6 4.8l-2.9 4.8c-.5.8-.7 1.7-.7 2.6v.4c0 .5.2 1 .5 ' '1.4l6.8 9.6 6.9 7.6c.7.8 1.6 1.6 2.5 2.2l13.6 9.6 14.9 10h9.4Z" fill="url(#b)"/>' '<path fill-rule="evenodd" clip-rule="evenodd" d="m232.8 191 18.2-2 19 2 6.1-4.5-25.1-3-24.3 3 6.1 4.5Zm18.2-14 ' '39.3-.4c.6 0 1.3-.1 1.9-.4l4.8-3.2c.32-.25.63-.5.97-.75.71-.55 1.5-1.16 2.53-2.05l8.6-9.6 ' '5.7-8.3c.6-.9.8-1.9.6-2.9l-.2-1.4 3.6-1v13l-3.8 8-15 10-38 25-11-1-10.2 1-38-25-15-10-3.8-8v-13l3.6 ' '1-.2 1.4c-.2 1 0 2 .6 2.9l5.7 8.3 8.6 9.6c1.02.89 1.82 1.5 2.53 2.05.34.25.65.5.97.75l4.8 3.2c.6.3 1.3.4 1.9.4l38.5.4Z" ' 'fill="', rp.bandcol, '"/></g></svg>' ); } else { // solitaire buf = abi.encodePacked( buf, '<path d="M255 194.5c-2.9 2-6.7 2-9.6 0l-46.4-31.6c-5.2-3.6-4.9-11.4.6-14.4l10-5.6c1.3-.7 2.7-1.1 ' '4.2-1.1h72.8c1.5 0 2.9.4 4.2 1.1l10 5.6c5.5 3.1 5.8 10.9.6 14.4l-46.4 31.6Z" fill="url(#b)"/>' '<path d="m249.9 196.3 5-11.4-3.2-22.9-.8-8.7h-2.8l-.8 8.7-2.54 22.9 5.14 11.4Z" fill="', rp.bandcol, '"/>' '<path d="m245.9 202.4-5.4.5-46.9-33.8c-2.4-1.7-3.9-5.2-3.7-7.4l.9-4.1c0-.1 0-.1.1-.4l1.7-4 3.5-.2-.7 ' '1.9c-.3.9-.2 1.8-.1 2.8v.5c.3 1.6 1.8 3 3.2 3.9l39.4 25.6c2.7 1.8 5.88 0 6.98-3.1l7.92 18 1.1.1 5.2.5 ' '47.2-34c2.4-1.7 3.9-5.2 3.7-7.4l-.9-4.1c0-.1 0-.1-.1-.4l-1.7-4-3.5-.2.7 1.9c.3.9.2 1.8.1 ' '2.8v.5c-.3 1.6-1.8 3-3.2 3.9l-39.4 25.6c-2.7 1.8-6.12-.1-7.12-3.2l-4 8.9-3.48 9" fill="', rp.bandcol, '"/></g></svg>' ); } } return (buf, rp); } // ============ OVERRIDES ============ /// @notice Override isApprovedForAll to whitelist user's OpenSea proxy accounts to enable gas-less listings. function isApprovedForAll(address owner, address operator) public view override returns (bool) { // Whitelist OpenSea proxy contract for easy trading. ProxyRegistry proxyRegistry = ProxyRegistry( openSeaProxyRegistryAddress ); if ( address(proxyRegistry.proxies(owner)) == operator ) { return true; } return super.isApprovedForAll(owner, operator); } /// @notice Updates tokenId's wearer and seed to update background function _beforeTokenTransfer( address from, address to, uint256 tokenId ) internal virtual override { super._beforeTokenTransfer(from, to, tokenId); if (!(from == address(0x0) || to == address(0x0))) { uint256 prevBg = _wearerSeed[tokenId] % 335; _wearerSeed[tokenId] = randSeed(to, tokenId, 13999234923493293432397); uint256 thisBg = _wearerSeed[tokenId] % 335; uint256 thisBg30 = thisBg + 30; uint256 prevBg30 = prevBg + 30; if ((thisBg > prevBg ? thisBg30 - prevBg30 : prevBg30 - thisBg30) < 30) { _wearerSeed[tokenId] += 65; } } } function tokenURI(uint256 tokenId) public view virtual override returns (string memory) { require(_exists(tokenId), "Nonexistent token"); (bytes memory svgBuf, RingParams memory rp) = getSvg(tokenId); // Attributes string memory bandcol = rp.band_idx == 0 ? "Rose gold" : rp.band_idx == 1 ? "Platinum" : "Gold"; string memory gemcol; string memory cutname; { if (rp.cut_idx == 0) { gemcol = "Holographic"; cutname = "Ethereum"; } else { gemcol = string(abi.encodePacked("hsl(", toString(rp.gemcol_h), ", ", toString(rp.gemcol_s), "%, ", toString(rp.gemcol_l), "%)")); cutname = rp.cut_idx == 1 ? "Round" : rp.cut_idx == 2 ? "Emerald" : "Solitaire"; } } string memory metadata_attr = string( abi.encodePacked( 'attributes": [{"trait_type": "Cut", "value": "', cutname, '"},', '{"trait_type": "Band color", "value": "', bandcol, '"},', '{"trait_type": "Background color", "value": "hsl(', toString(rp.bgcol_h), ", ", toString(rp.bgcol_s), "%, 50%)", '"},', '{"trait_type": "Gem color", "value": "', gemcol, '"}', "]" ) ); string memory json = Base64.encode( bytes( abi.encodePacked( '{"name": "0xCarat #', toString(tokenId), '", "description": "A fully on-chain ring to celebrate on-chain love.", "image": "data:image/svg+xml;base64,', Base64.encode(svgBuf), '","', metadata_attr, "}" ) ) ); return string(abi.encodePacked("data:application/json;base64,", json)); } } /// @notice These contract definitions are used to create a reference to the OpenSea ProxyRegistry contract by using the registry's address (see isApprovedForAll). contract OwnableDelegateProxy {} contract ProxyRegistry { mapping(address => OwnableDelegateProxy) public proxies; } /// [MIT License] /// @title Base64 /// @notice Provides a function for encoding some bytes in base64 /// @author Brecht Devos <[email protected]> library Base64 { bytes internal constant TABLE = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"; /// @notice Encodes some bytes to the base64 representation function encode(bytes memory data) internal pure returns (string memory) { uint256 len = data.length; if (len == 0) return ""; // multiply by 4/3 rounded up uint256 encodedLen = 4 * ((len + 2) / 3); // Add some extra buffer at the end bytes memory result = new bytes(encodedLen + 32); bytes memory table = TABLE; assembly { let tablePtr := add(table, 1) let resultPtr := add(result, 32) for { let i := 0 } lt(i, len) { } { i := add(i, 3) let input := and(mload(add(data, i)), 0xffffff) let out := mload(add(tablePtr, and(shr(18, input), 0x3F))) out := shl(8, out) out := add(out, and(mload(add(tablePtr, and(shr(12, input), 0x3F))), 0xFF)) out := shl(8, out) out := add(out, and(mload(add(tablePtr, and(shr(6, input), 0x3F))), 0xFF)) out := shl(8, out) out := add(out, and(mload(add(tablePtr, and(input, 0x3F))), 0xFF)) out := shl(224, out) mstore(resultPtr, out) resultPtr := add(resultPtr, 4) } switch mod(len, 3) case 1 { mstore(sub(resultPtr, 2), shl(240, 0x3d3d)) } case 2 { mstore(sub(resultPtr, 1), shl(248, 0x3d)) } mstore(result, encodedLen) } return string(result); } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.0 (token/ERC721/ERC721.sol) 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}. If set, the resulting URI for each * token will be the concatenation of the `baseURI` and the `tokenId`. 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 { _setApprovalForAll(_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 Approve `operator` to operate on all of `owner` tokens * * Emits a {ApprovalForAll} event. */ function _setApprovalForAll( address owner, address operator, bool approved ) internal virtual { require(owner != operator, "ERC721: approve to caller"); _operatorApprovals[owner][operator] = approved; emit ApprovalForAll(owner, operator, approved); } /** * @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.onERC721Received.selector; } catch (bytes memory reason) { if (reason.length == 0) { revert("ERC721: transfer to non ERC721Receiver implementer"); } else { 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` and `to` are never both zero. * * 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 // OpenZeppelin Contracts v4.4.0 (access/Ownable.sol) 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() { _transferOwnership(_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 { _transferOwnership(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"); _transferOwnership(newOwner); } /** * @dev Transfers ownership of the contract to a new account (`newOwner`). * Internal function without access restriction. */ function _transferOwnership(address newOwner) internal virtual { address oldOwner = _owner; _owner = newOwner; emit OwnershipTransferred(oldOwner, newOwner); } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.0 (security/ReentrancyGuard.sol) pragma solidity ^0.8.0; /** * @dev Contract module that helps prevent reentrant calls to a function. * * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier * available, which can be applied to functions to make sure there are no nested * (reentrant) calls to them. * * Note that because there is a single `nonReentrant` guard, functions marked as * `nonReentrant` may not call one another. This can be worked around by making * those functions `private`, and then adding `external` `nonReentrant` entry * points to them. * * TIP: If you would like to learn more about reentrancy and alternative ways * to protect against it, check out our blog post * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul]. */ abstract contract ReentrancyGuard { // Booleans are more expensive than uint256 or any type that takes up a full // word because each write operation emits an extra SLOAD to first read the // slot's contents, replace the bits taken up by the boolean, and then write // back. This is the compiler's defense against contract upgrades and // pointer aliasing, and it cannot be disabled. // The values being non-zero value makes deployment a bit more expensive, // but in exchange the refund on every call to nonReentrant will be lower in // amount. Since refunds are capped to a percentage of the total // transaction's gas, it is best to keep them low in cases like this one, to // increase the likelihood of the full refund coming into effect. uint256 private constant _NOT_ENTERED = 1; uint256 private constant _ENTERED = 2; uint256 private _status; constructor() { _status = _NOT_ENTERED; } /** * @dev Prevents a contract from calling itself, directly or indirectly. * Calling a `nonReentrant` function from another `nonReentrant` * function is not supported. It is possible to prevent this from happening * by making the `nonReentrant` function external, and making it call a * `private` function that does the actual work. */ modifier nonReentrant() { // On the first call to nonReentrant, _notEntered will be true require(_status != _ENTERED, "ReentrancyGuard: reentrant call"); // Any calls to nonReentrant after this point will fail _status = _ENTERED; _; // By storing the original value once again, a refund is triggered (see // https://eips.ethereum.org/EIPS/eip-2200) _status = _NOT_ENTERED; } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.0 (utils/Counters.sol) pragma solidity ^0.8.0; /** * @title Counters * @author Matt Condon (@shrugs) * @dev Provides counters that can only be incremented, decremented or reset. This can be used e.g. to track the number * of elements in a mapping, issuing ERC721 ids, or counting request ids. * * Include with `using Counters for Counters.Counter;` */ library Counters { struct Counter { // This variable should never be directly accessed by users of the library: interactions must be restricted to // the library's function. As of Solidity v0.5.2, this cannot be enforced, though there is a proposal to add // this feature: see https://github.com/ethereum/solidity/issues/4637 uint256 _value; // default: 0 } function current(Counter storage counter) internal view returns (uint256) { return counter._value; } function increment(Counter storage counter) internal { unchecked { counter._value += 1; } } function decrement(Counter storage counter) internal { uint256 value = counter._value; require(value > 0, "Counter: decrement overflow"); unchecked { counter._value = value - 1; } } function reset(Counter storage counter) internal { counter._value = 0; } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.0 (utils/math/SafeMath.sol) 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 generally not needed starting with Solidity 0.8, since 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. 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; } } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.0 (token/ERC721/IERC721.sol) 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 // OpenZeppelin Contracts v4.4.0 (token/ERC721/IERC721Receiver.sol) 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 // OpenZeppelin Contracts v4.4.0 (token/ERC721/extensions/IERC721Metadata.sol) 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 // OpenZeppelin Contracts v4.4.0 (utils/Address.sol) 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; 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"); (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"); (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"); (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"); (bool success, bytes memory returndata) = target.delegatecall(data); return verifyCallResult(success, returndata, errorMessage); } /** * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the * revert reason using the provided one. * * _Available since v4.3._ */ function verifyCallResult( bool success, bytes memory returndata, string memory errorMessage ) internal 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 assembly { let returndata_size := mload(returndata) revert(add(32, returndata), returndata_size) } } else { revert(errorMessage); } } } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.0 (utils/Context.sol) 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) { return msg.data; } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.0 (utils/Strings.sol) pragma solidity ^0.8.0; /** * @dev String operations. */ library Strings { bytes16 private constant _HEX_SYMBOLS = "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] = _HEX_SYMBOLS[value & 0xf]; value >>= 4; } require(value == 0, "Strings: hex length insufficient"); return string(buffer); } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.0 (utils/introspection/ERC165.sol) 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 // OpenZeppelin Contracts v4.4.0 (utils/introspection/IERC165.sol) 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); }
{ "optimizer": { "enabled": true, "runs": 200 }, "outputSelection": { "*": { "*": [ "evm.bytecode", "evm.deployedBytecode", "devdoc", "userdoc", "metadata", "abi" ] } }, "metadata": { "useLiteralContent": true }, "libraries": {} }
Contract Security Audit
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Contract Creation Code
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0008060033
Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)
000000000000000000000000a5409ec958c83c3f309868babaca7c86dcb077c1
-----Decoded View---------------
Arg [0] : _openSeaProxyRegistryAddress (address): 0xa5409ec958C83C3f309868babACA7c86DCB077c1
-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 000000000000000000000000a5409ec958c83c3f309868babaca7c86dcb077c1
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