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ERC-721
Overview
Max Total Supply
0 0xKevinPunks
Holders
182
Market
Volume (24H)
N/A
Min Price (24H)
N/A
Max Price (24H)
N/A
Other Info
Token Contract
Balance
2 0xKevinPunksLoading...
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# | Exchange | Pair | Price | 24H Volume | % Volume |
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Minimal Proxy Contract for 0x78c543013ffdea141f1f0f8502e23b81948a9150
Contract Name:
AutoMinterERC721
Compiler Version
v0.8.10+commit.fc410830
Optimization Enabled:
Yes with 200 runs
Other Settings:
default evmVersion
Contract Source Code (Solidity Standard Json-Input format)
// SPDX-License-Identifier: UNLICENSED pragma solidity >=0.7.0 <0.9.0; // import '@openzeppelin/contracts/token/ERC721/ERC721.sol'; import "@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol"; import "@openzeppelin/contracts/utils/cryptography/ECDSA.sol"; import "@openzeppelin/contracts-upgradeable/proxy/utils/Initializable.sol"; import "@openzeppelin/contracts-upgradeable/token/ERC721/ERC721Upgradeable.sol"; import "@openzeppelin/contracts-upgradeable/utils/introspection/ERC165Upgradeable.sol"; import "@openzeppelin/contracts-upgradeable/utils/StringsUpgradeable.sol"; import "@openzeppelin/contracts/interfaces/IERC20.sol"; import "./Base64.sol"; // import "@openzeppelin/contracts-upgradeable/interfaces/IERC2981Upgradeable.sol"; /** * @dev Interface for the NFT Royalty Standard */ interface IERC2981Upgradeable is IERC165Upgradeable { /** * @dev Called with the sale price to determine how much royalty is owed and to whom. * @param tokenId - the NFT asset queried for royalty information * @param salePrice - the sale price of the NFT asset specified by `tokenId` * @return receiver - address of who should be sent the royalty payment * @return royaltyAmount - the royalty payment amount for `salePrice` */ function royaltyInfo(uint256 tokenId, uint256 salePrice) external view returns (address receiver, uint256 royaltyAmount); } contract AutoMinterERC721 is Initializable, ERC721Upgradeable, OwnableUpgradeable, IERC2981Upgradeable { string private baseURI; address constant public shareAddress = 0xE28564784a0f57554D8beEc807E8609b40A97241; uint256 public mintFee; bool private mintSelectionEnabled; bool private mintRandomEnabled; uint256 public remaining; mapping(uint256 => uint256) public cache; mapping(uint256 => uint256) public cachePosition; mapping(address => uint256) public accountMintCount; address private whiteListSignerAddress; uint256 public mintLimit; uint256 public royaltyBasis = 1000; uint256 public ammountWithdrawn = 0; string public placeholderImage; constructor(){} function initialize(string memory name_, string memory symbol_, string memory baseURI_, address ownerAddress_, uint256 mintFee_, uint256 size_, bool mintSelectionEnabled_, bool mintRandomEnabled_, address whiteListSignerAddress_, uint256 mintLimit_, uint256 royaltyBasis_, string memory placeholderImage_) public initializer { __ERC721_init(name_, symbol_); baseURI = baseURI_; mintFee = mintFee_; mintSelectionEnabled = mintSelectionEnabled_; mintRandomEnabled = mintRandomEnabled_; _transferOwnership(ownerAddress_); remaining = size_; whiteListSignerAddress = whiteListSignerAddress_; mintLimit = mintLimit_; royaltyBasis = royaltyBasis_; placeholderImage = placeholderImage_; } function _baseURI() internal view virtual override returns (string memory) { return baseURI; } /* Mint specific token if individual token selection is enabled */ function mintToken(uint256 tokenID) payable public { require(mintSelectionEnabled == true, 'Specific token minting is not enabled for this contract'); require(msg.value == mintFee, 'Eth sent does not match the mint fee'); _updateUserMintCount(msg.sender); // _splitPayment(); _drawIndex(tokenID); _safeMint(msg.sender, tokenID); } /* Mint random token if random minting is enabled */ function mintRandom() payable public { require(mintRandomEnabled == true, 'Random minting is not enabled for this contract'); require(msg.value == mintFee, 'Eth sent does not match the mint fee'); _updateUserMintCount(msg.sender); // _splitPayment(); uint256 tokenID = _drawRandomIndex(); _safeMint(msg.sender, tokenID); } /* Mint if have been pre-approved using signature of the owner */ function mintWithSignature(bool isFree, address to, uint256 tokenID, bool isRandom, uint256 customFee, bytes calldata signature) payable public { _updateUserMintCount(to); /* Hash the content (isFree, to, tokenID) and verify the signature from the owner address */ address signer = ECDSA.recover( ECDSA.toEthSignedMessageHash(keccak256(abi.encodePacked(isFree, to, tokenID, isRandom, customFee))), signature); require(signer == owner() || signer == whiteListSignerAddress, "The signature provided does not match"); /* If isFree then do not splitPayment, else splitPayment */ if(!isFree){ /* If custom fee is not provided use, mint fee */ if(customFee == 0){ require(msg.value == mintFee, 'Eth sent does not match the mint fee'); } /* If custom fee is provided use, the custom fee */ else{ require(msg.value == customFee, 'Eth sent does not match the mint fee'); } // _splitPayment(); } /* Mint the token for the provided to address */ if(isRandom){ tokenID = _drawRandomIndex(); } else{ _drawIndex(tokenID); } _safeMint(to, tokenID); } /* Mint a token to a specific address */ function mintToAccount(address to, uint256 tokenID) onlyOwner() public { _drawIndex(tokenID); _safeMint(to, tokenID); } // function _splitPayment() internal // { // if(msg.value != 0){ // uint256 splitValue = msg.value / 10; // uint256 remainingValue = msg.value - splitValue; // payable(shareAddress).transfer(splitValue); // payable(owner()).transfer(remainingValue); // } // } function _drawRandomIndex() internal returns (uint256 index) { //RNG uint256 i = uint(keccak256(abi.encodePacked(block.timestamp))) % remaining; // if there's a cache at cache[i] then use it // otherwise use i itself index = cache[i] == 0 ? i : cache[i]; // grab a number from the tail cache[i] = cache[remaining - 1] == 0 ? remaining - 1 : cache[remaining - 1]; // store the position of moved token in cache to be looked up (add 1 to avoid 0, remove when recovering) cachePosition[cache[i]] = i + 1; remaining = remaining - 1; } function _drawIndex(uint256 tokenID) internal { // recover the index, subtract 1 from cachePosition as an additional 1 was added to avoid 0 conflict uint256 i = cachePosition[tokenID] == 0 ? tokenID : cachePosition[tokenID] - 1; require(i <= remaining); // grab a number from the tail cache[i] = cache[remaining - 1] == 0 ? remaining - 1 : cache[remaining - 1]; // store the position of moved token in cache to be looked up (add 1 to avoid 0, remove when recovering) cachePosition[cache[i]] = i + 1; remaining = remaining - 1; } function _updateUserMintCount(address account) internal { // increment a mapping for user on how many mints they have uint256 count = accountMintCount[account]; require(count < mintLimit || mintLimit == 0, "Mint limit for this account has been exceeded"); accountMintCount[account] = count + 1; } function isTokenAvailable(uint256 tokenID) external view returns (bool) { return !_exists(tokenID); } function toggleRandomPublicMinting() onlyOwner() public { mintRandomEnabled = !mintRandomEnabled; } function changeMintFee(uint256 mintFee_) onlyOwner() public { mintFee = mintFee_; } function changeMintLimit(uint256 mintLimit_) onlyOwner() public { mintLimit = mintLimit_; } function changePlaceholderImage(string memory placeholderImage_) onlyOwner() public { require(bytes(placeholderImage).length != 0, "Metadata has already been revealed"); require(bytes(placeholderImage_).length != 0, "Placeholder image cannot be empty"); placeholderImage = placeholderImage_; } function royaltyInfo(uint _tokenId, uint _salePrice) external view returns (address receiver, uint royaltyAmount) { return (address(this), uint((_salePrice * royaltyBasis)/10000)); } /* Transfer balance of this contract to an account */ function transferBalance(address payable to, uint256 ammount) onlyOwner() public{ if(address(this).balance != 0){ require(address(this).balance <= ammount, "Not enought Balance to Transfer"); uint256 splitValue = ammount / 10; uint256 remainingValue = ammount - splitValue; payable(shareAddress).transfer(splitValue); payable(to).transfer(remainingValue); ammountWithdrawn += ammount; } } /* Transfer any ERC20 balance of this contract to an account */ function transferERC20Balance(address erc20ContractAddress, address payable to, uint256 ammount) onlyOwner() public{ uint256 splitValue = ammount / 10; uint256 remainingValue = ammount - splitValue; IERC20(erc20ContractAddress).transfer(shareAddress, splitValue); IERC20(erc20ContractAddress).transfer(to, remainingValue); } function contractURI() public view returns (string memory) { return string(abi.encodePacked( "data:application/json;base64,", Base64.encode( bytes( string(abi.encodePacked('{"name":"', name(), '","seller_fee_basis_points":', Strings.toString(royaltyBasis), ',"fee_recipient":"', "0x", toAsciiString(address(this)), '"}' )) ) ) )); } function toAsciiString(address x) internal pure returns (string memory) { bytes memory s = new bytes(40); for (uint i = 0; i < 20; i++) { bytes1 b = bytes1(uint8(uint(uint160(x)) / (2**(8*(19 - i))))); bytes1 hi = bytes1(uint8(b) / 16); bytes1 lo = bytes1(uint8(b) - 16 * uint8(hi)); s[2*i] = char(hi); s[2*i+1] = char(lo); } return string(s); } function char(bytes1 b) internal pure returns (bytes1 c) { if (uint8(b) < 10) return bytes1(uint8(b) + 0x30); else return bytes1(uint8(b) + 0x57); } /** * @dev See {IERC165-supportsInterface}. */ function supportsInterface(bytes4 interfaceId) public view virtual override(ERC721Upgradeable, IERC165Upgradeable) returns (bool) { return interfaceId == type(IERC721Upgradeable).interfaceId || interfaceId == type(IERC721MetadataUpgradeable).interfaceId || interfaceId == type(IERC2981Upgradeable).interfaceId || super.supportsInterface(interfaceId); } function isPublicMintingEnabled() external view returns (bool){ return mintRandomEnabled; } /** * @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(); if(bytes(placeholderImage).length > 0){ return placeholderImage; } else{ return bytes(baseURI).length > 0 ? string(abi.encodePacked(baseURI, Strings.toString(tokenId))) : ""; } } function reveal() onlyOwner() public { placeholderImage = ""; } function version() external pure returns (string memory) { return "1.0.5"; } receive() external payable {} }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; /// @title Base64 /// @author Brecht Devos - <[email protected]> /// @notice Provides a function for encoding some bytes in base64 library Base64 { string internal constant TABLE = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"; function encode(bytes memory data) internal pure returns (string memory) { if (data.length == 0) return ""; // load the table into memory string memory table = TABLE; // multiply by 4/3 rounded up uint256 encodedLen = 4 * ((data.length + 2) / 3); // add some extra buffer at the end required for the writing string memory result = new string(encodedLen + 32); assembly { // set the actual output length mstore(result, encodedLen) // prepare the lookup table let tablePtr := add(table, 1) // input ptr let dataPtr := data let endPtr := add(dataPtr, mload(data)) // result ptr, jump over length let resultPtr := add(result, 32) // run over the input, 3 bytes at a time for { } lt(dataPtr, endPtr) { } { dataPtr := add(dataPtr, 3) // read 3 bytes let input := mload(dataPtr) // write 4 characters mstore( resultPtr, shl(248, mload(add(tablePtr, and(shr(18, input), 0x3F)))) ) resultPtr := add(resultPtr, 1) mstore( resultPtr, shl(248, mload(add(tablePtr, and(shr(12, input), 0x3F)))) ) resultPtr := add(resultPtr, 1) mstore( resultPtr, shl(248, mload(add(tablePtr, and(shr(6, input), 0x3F)))) ) resultPtr := add(resultPtr, 1) mstore( resultPtr, shl(248, mload(add(tablePtr, and(input, 0x3F)))) ) resultPtr := add(resultPtr, 1) } // padding with '=' switch mod(mload(data), 3) case 1 { mstore(sub(resultPtr, 2), shl(240, 0x3d3d)) } case 2 { mstore(sub(resultPtr, 1), shl(248, 0x3d)) } } return result; } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (utils/cryptography/ECDSA.sol) pragma solidity ^0.8.0; import "../Strings.sol"; /** * @dev Elliptic Curve Digital Signature Algorithm (ECDSA) operations. * * These functions can be used to verify that a message was signed by the holder * of the private keys of a given address. */ library ECDSA { enum RecoverError { NoError, InvalidSignature, InvalidSignatureLength, InvalidSignatureS, InvalidSignatureV } function _throwError(RecoverError error) private pure { if (error == RecoverError.NoError) { return; // no error: do nothing } else if (error == RecoverError.InvalidSignature) { revert("ECDSA: invalid signature"); } else if (error == RecoverError.InvalidSignatureLength) { revert("ECDSA: invalid signature length"); } else if (error == RecoverError.InvalidSignatureS) { revert("ECDSA: invalid signature 's' value"); } else if (error == RecoverError.InvalidSignatureV) { revert("ECDSA: invalid signature 'v' value"); } } /** * @dev Returns the address that signed a hashed message (`hash`) with * `signature` or error string. This address can then be used for verification purposes. * * The `ecrecover` EVM opcode allows for malleable (non-unique) signatures: * this function rejects them by requiring the `s` value to be in the lower * half order, and the `v` value to be either 27 or 28. * * IMPORTANT: `hash` _must_ be the result of a hash operation for the * verification to be secure: it is possible to craft signatures that * recover to arbitrary addresses for non-hashed data. A safe way to ensure * this is by receiving a hash of the original message (which may otherwise * be too long), and then calling {toEthSignedMessageHash} on it. * * Documentation for signature generation: * - with https://web3js.readthedocs.io/en/v1.3.4/web3-eth-accounts.html#sign[Web3.js] * - with https://docs.ethers.io/v5/api/signer/#Signer-signMessage[ethers] * * _Available since v4.3._ */ function tryRecover(bytes32 hash, bytes memory signature) internal pure returns (address, RecoverError) { // Check the signature length // - case 65: r,s,v signature (standard) // - case 64: r,vs signature (cf https://eips.ethereum.org/EIPS/eip-2098) _Available since v4.1._ if (signature.length == 65) { bytes32 r; bytes32 s; uint8 v; // ecrecover takes the signature parameters, and the only way to get them // currently is to use assembly. assembly { r := mload(add(signature, 0x20)) s := mload(add(signature, 0x40)) v := byte(0, mload(add(signature, 0x60))) } return tryRecover(hash, v, r, s); } else if (signature.length == 64) { bytes32 r; bytes32 vs; // ecrecover takes the signature parameters, and the only way to get them // currently is to use assembly. assembly { r := mload(add(signature, 0x20)) vs := mload(add(signature, 0x40)) } return tryRecover(hash, r, vs); } else { return (address(0), RecoverError.InvalidSignatureLength); } } /** * @dev Returns the address that signed a hashed message (`hash`) with * `signature`. This address can then be used for verification purposes. * * The `ecrecover` EVM opcode allows for malleable (non-unique) signatures: * this function rejects them by requiring the `s` value to be in the lower * half order, and the `v` value to be either 27 or 28. * * IMPORTANT: `hash` _must_ be the result of a hash operation for the * verification to be secure: it is possible to craft signatures that * recover to arbitrary addresses for non-hashed data. A safe way to ensure * this is by receiving a hash of the original message (which may otherwise * be too long), and then calling {toEthSignedMessageHash} on it. */ function recover(bytes32 hash, bytes memory signature) internal pure returns (address) { (address recovered, RecoverError error) = tryRecover(hash, signature); _throwError(error); return recovered; } /** * @dev Overload of {ECDSA-tryRecover} that receives the `r` and `vs` short-signature fields separately. * * See https://eips.ethereum.org/EIPS/eip-2098[EIP-2098 short signatures] * * _Available since v4.3._ */ function tryRecover( bytes32 hash, bytes32 r, bytes32 vs ) internal pure returns (address, RecoverError) { bytes32 s; uint8 v; assembly { s := and(vs, 0x7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff) v := add(shr(255, vs), 27) } return tryRecover(hash, v, r, s); } /** * @dev Overload of {ECDSA-recover} that receives the `r and `vs` short-signature fields separately. * * _Available since v4.2._ */ function recover( bytes32 hash, bytes32 r, bytes32 vs ) internal pure returns (address) { (address recovered, RecoverError error) = tryRecover(hash, r, vs); _throwError(error); return recovered; } /** * @dev Overload of {ECDSA-tryRecover} that receives the `v`, * `r` and `s` signature fields separately. * * _Available since v4.3._ */ function tryRecover( bytes32 hash, uint8 v, bytes32 r, bytes32 s ) internal pure returns (address, RecoverError) { // EIP-2 still allows signature malleability for ecrecover(). Remove this possibility and make the signature // unique. Appendix F in the Ethereum Yellow paper (https://ethereum.github.io/yellowpaper/paper.pdf), defines // the valid range for s in (301): 0 < s < secp256k1n ÷ 2 + 1, and for v in (302): v ∈ {27, 28}. Most // signatures from current libraries generate a unique signature with an s-value in the lower half order. // // If your library generates malleable signatures, such as s-values in the upper range, calculate a new s-value // with 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141 - s1 and flip v from 27 to 28 or // vice versa. If your library also generates signatures with 0/1 for v instead 27/28, add 27 to v to accept // these malleable signatures as well. if (uint256(s) > 0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0) { return (address(0), RecoverError.InvalidSignatureS); } if (v != 27 && v != 28) { return (address(0), RecoverError.InvalidSignatureV); } // If the signature is valid (and not malleable), return the signer address address signer = ecrecover(hash, v, r, s); if (signer == address(0)) { return (address(0), RecoverError.InvalidSignature); } return (signer, RecoverError.NoError); } /** * @dev Overload of {ECDSA-recover} that receives the `v`, * `r` and `s` signature fields separately. */ function recover( bytes32 hash, uint8 v, bytes32 r, bytes32 s ) internal pure returns (address) { (address recovered, RecoverError error) = tryRecover(hash, v, r, s); _throwError(error); return recovered; } /** * @dev Returns an Ethereum Signed Message, created from a `hash`. This * produces hash corresponding to the one signed with the * https://eth.wiki/json-rpc/API#eth_sign[`eth_sign`] * JSON-RPC method as part of EIP-191. * * See {recover}. */ function toEthSignedMessageHash(bytes32 hash) internal pure returns (bytes32) { // 32 is the length in bytes of hash, // enforced by the type signature above return keccak256(abi.encodePacked("\x19Ethereum Signed Message:\n32", hash)); } /** * @dev Returns an Ethereum Signed Message, created from `s`. This * produces hash corresponding to the one signed with the * https://eth.wiki/json-rpc/API#eth_sign[`eth_sign`] * JSON-RPC method as part of EIP-191. * * See {recover}. */ function toEthSignedMessageHash(bytes memory s) internal pure returns (bytes32) { return keccak256(abi.encodePacked("\x19Ethereum Signed Message:\n", Strings.toString(s.length), s)); } /** * @dev Returns an Ethereum Signed Typed Data, created from a * `domainSeparator` and a `structHash`. This produces hash corresponding * to the one signed with the * https://eips.ethereum.org/EIPS/eip-712[`eth_signTypedData`] * JSON-RPC method as part of EIP-712. * * See {recover}. */ function toTypedDataHash(bytes32 domainSeparator, bytes32 structHash) internal pure returns (bytes32) { return keccak256(abi.encodePacked("\x19\x01", domainSeparator, structHash)); } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (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 v4.4.1 (token/ERC20/IERC20.sol) pragma solidity ^0.8.0; /** * @dev Interface of the ERC20 standard as defined in the EIP. */ interface IERC20 { /** * @dev Returns the amount of tokens in existence. */ function totalSupply() external view returns (uint256); /** * @dev Returns the amount of tokens owned by `account`. */ function balanceOf(address account) external view returns (uint256); /** * @dev Moves `amount` tokens from the caller's account to `recipient`. * * Returns a boolean value indicating whether the operation succeeded. * * Emits a {Transfer} event. */ function transfer(address recipient, uint256 amount) external returns (bool); /** * @dev Returns the remaining number of tokens that `spender` will be * allowed to spend on behalf of `owner` through {transferFrom}. This is * zero by default. * * This value changes when {approve} or {transferFrom} are called. */ function allowance(address owner, address spender) external view returns (uint256); /** * @dev Sets `amount` as the allowance of `spender` over the caller's tokens. * * Returns a boolean value indicating whether the operation succeeded. * * IMPORTANT: Beware that changing an allowance with this method brings the risk * that someone may use both the old and the new allowance by unfortunate * transaction ordering. One possible solution to mitigate this race * condition is to first reduce the spender's allowance to 0 and set the * desired value afterwards: * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729 * * Emits an {Approval} event. */ function approve(address spender, uint256 amount) external returns (bool); /** * @dev Moves `amount` tokens from `sender` to `recipient` using the * allowance mechanism. `amount` is then deducted from the caller's * allowance. * * Returns a boolean value indicating whether the operation succeeded. * * Emits a {Transfer} event. */ function transferFrom( address sender, address recipient, uint256 amount ) external returns (bool); /** * @dev Emitted when `value` tokens are moved from one account (`from`) to * another (`to`). * * Note that `value` may be zero. */ event Transfer(address indexed from, address indexed to, uint256 value); /** * @dev Emitted when the allowance of a `spender` for an `owner` is set by * a call to {approve}. `value` is the new allowance. */ event Approval(address indexed owner, address indexed spender, uint256 value); }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (interfaces/IERC20.sol) pragma solidity ^0.8.0; import "../token/ERC20/IERC20.sol";
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (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 IERC165Upgradeable { /** * @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 // OpenZeppelin Contracts v4.4.1 (utils/introspection/ERC165.sol) pragma solidity ^0.8.0; import "./IERC165Upgradeable.sol"; import "../../proxy/utils/Initializable.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 ERC165Upgradeable is Initializable, IERC165Upgradeable { function __ERC165_init() internal onlyInitializing { __ERC165_init_unchained(); } function __ERC165_init_unchained() internal onlyInitializing { } /** * @dev See {IERC165-supportsInterface}. */ function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) { return interfaceId == type(IERC165Upgradeable).interfaceId; } uint256[50] private __gap; }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (utils/Strings.sol) pragma solidity ^0.8.0; /** * @dev String operations. */ library StringsUpgradeable { 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 v4.4.1 (utils/Context.sol) pragma solidity ^0.8.0; import "../proxy/utils/Initializable.sol"; /** * @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 ContextUpgradeable is Initializable { function __Context_init() internal onlyInitializing { __Context_init_unchained(); } function __Context_init_unchained() internal onlyInitializing { } function _msgSender() internal view virtual returns (address) { return msg.sender; } function _msgData() internal view virtual returns (bytes calldata) { return msg.data; } uint256[50] private __gap; }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (utils/Address.sol) pragma solidity ^0.8.0; /** * @dev Collection of functions related to the address type */ library AddressUpgradeable { /** * @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 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 v4.4.1 (token/ERC721/extensions/IERC721Metadata.sol) pragma solidity ^0.8.0; import "../IERC721Upgradeable.sol"; /** * @title ERC-721 Non-Fungible Token Standard, optional metadata extension * @dev See https://eips.ethereum.org/EIPS/eip-721 */ interface IERC721MetadataUpgradeable is IERC721Upgradeable { /** * @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 v4.4.1 (token/ERC721/IERC721.sol) pragma solidity ^0.8.0; import "../../utils/introspection/IERC165Upgradeable.sol"; /** * @dev Required interface of an ERC721 compliant contract. */ interface IERC721Upgradeable is IERC165Upgradeable { /** * @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 v4.4.1 (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 IERC721ReceiverUpgradeable { /** * @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 v4.4.1 (token/ERC721/ERC721.sol) pragma solidity ^0.8.0; import "./IERC721Upgradeable.sol"; import "./IERC721ReceiverUpgradeable.sol"; import "./extensions/IERC721MetadataUpgradeable.sol"; import "../../utils/AddressUpgradeable.sol"; import "../../utils/ContextUpgradeable.sol"; import "../../utils/StringsUpgradeable.sol"; import "../../utils/introspection/ERC165Upgradeable.sol"; import "../../proxy/utils/Initializable.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 ERC721Upgradeable is Initializable, ContextUpgradeable, ERC165Upgradeable, IERC721Upgradeable, IERC721MetadataUpgradeable { using AddressUpgradeable for address; using StringsUpgradeable 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. */ function __ERC721_init(string memory name_, string memory symbol_) internal onlyInitializing { __Context_init_unchained(); __ERC165_init_unchained(); __ERC721_init_unchained(name_, symbol_); } function __ERC721_init_unchained(string memory name_, string memory symbol_) internal onlyInitializing { _name = name_; _symbol = symbol_; } /** * @dev See {IERC165-supportsInterface}. */ function supportsInterface(bytes4 interfaceId) public view virtual override(ERC165Upgradeable, IERC165Upgradeable) returns (bool) { return interfaceId == type(IERC721Upgradeable).interfaceId || interfaceId == type(IERC721MetadataUpgradeable).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 = ERC721Upgradeable.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 = ERC721Upgradeable.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 = ERC721Upgradeable.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(ERC721Upgradeable.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(ERC721Upgradeable.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 IERC721ReceiverUpgradeable(to).onERC721Received(_msgSender(), from, tokenId, _data) returns (bytes4 retval) { return retval == IERC721ReceiverUpgradeable.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 {} uint256[44] private __gap; }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (proxy/utils/Initializable.sol) pragma solidity ^0.8.0; import "../../utils/AddressUpgradeable.sol"; /** * @dev This is a base contract to aid in writing upgradeable contracts, or any kind of contract that will be deployed * behind a proxy. Since a proxied contract can't have a constructor, it's common to move constructor logic to an * external initializer function, usually called `initialize`. It then becomes necessary to protect this initializer * function so it can only be called once. The {initializer} modifier provided by this contract will have this effect. * * TIP: To avoid leaving the proxy in an uninitialized state, the initializer function should be called as early as * possible by providing the encoded function call as the `_data` argument to {ERC1967Proxy-constructor}. * * CAUTION: When used with inheritance, manual care must be taken to not invoke a parent initializer twice, or to ensure * that all initializers are idempotent. This is not verified automatically as constructors are by Solidity. * * [CAUTION] * ==== * Avoid leaving a contract uninitialized. * * An uninitialized contract can be taken over by an attacker. This applies to both a proxy and its implementation * contract, which may impact the proxy. To initialize the implementation contract, you can either invoke the * initializer manually, or you can include a constructor to automatically mark it as initialized when it is deployed: * * [.hljs-theme-light.nopadding] * ``` * /// @custom:oz-upgrades-unsafe-allow constructor * constructor() initializer {} * ``` * ==== */ abstract contract Initializable { /** * @dev Indicates that the contract has been initialized. */ bool private _initialized; /** * @dev Indicates that the contract is in the process of being initialized. */ bool private _initializing; /** * @dev Modifier to protect an initializer function from being invoked twice. */ modifier initializer() { // If the contract is initializing we ignore whether _initialized is set in order to support multiple // inheritance patterns, but we only do this in the context of a constructor, because in other contexts the // contract may have been reentered. require(_initializing ? _isConstructor() : !_initialized, "Initializable: contract is already initialized"); bool isTopLevelCall = !_initializing; if (isTopLevelCall) { _initializing = true; _initialized = true; } _; if (isTopLevelCall) { _initializing = false; } } /** * @dev Modifier to protect an initialization function so that it can only be invoked by functions with the * {initializer} modifier, directly or indirectly. */ modifier onlyInitializing() { require(_initializing, "Initializable: contract is not initializing"); _; } function _isConstructor() private view returns (bool) { return !AddressUpgradeable.isContract(address(this)); } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (access/Ownable.sol) pragma solidity ^0.8.0; import "../utils/ContextUpgradeable.sol"; import "../proxy/utils/Initializable.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 OwnableUpgradeable is Initializable, ContextUpgradeable { address private _owner; event OwnershipTransferred(address indexed previousOwner, address indexed newOwner); /** * @dev Initializes the contract setting the deployer as the initial owner. */ function __Ownable_init() internal onlyInitializing { __Context_init_unchained(); __Ownable_init_unchained(); } function __Ownable_init_unchained() internal onlyInitializing { _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); } uint256[49] private __gap; }
{ "remappings": [], "optimizer": { "enabled": true, "runs": 200 }, "evmVersion": "london", "libraries": {}, "outputSelection": { "*": { "*": [ "evm.bytecode", "evm.deployedBytecode", "devdoc", "userdoc", "metadata", "abi" ] } } }
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A token is a representation of an on-chain or off-chain asset. The token page shows information such as price, total supply, holders, transfers and social links. Learn more about this page in our Knowledge Base.