ERC-721
Overview
Max Total Supply
4 GHOSTS
Holders
2
Total Transfers
-
Market
Volume (24H)
N/A
Min Price (24H)
N/A
Max Price (24H)
N/A
Other Info
Token Contract
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# | Exchange | Pair | Price | 24H Volume | % Volume |
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Minimal Proxy Contract for 0xf61f4f2c896219a90670e19e188ebb93fcc002e8
Contract Name:
NFTCollection
Compiler Version
v0.8.17+commit.8df45f5f
Optimization Enabled:
Yes with 1337 runs
Other Settings:
default evmVersion
Contract Source Code (Solidity Standard Json-Input format)
// SPDX-License-Identifier: MIT OR Apache-2.0 pragma solidity ^0.8.12; import "./interfaces/internal/INFTCollectionInitializer.sol"; import "./interfaces/standards/royalties/IGetRoyalties.sol"; import "./interfaces/standards/royalties/ITokenCreator.sol"; import "./interfaces/standards/royalties/IGetFees.sol"; import "./interfaces/standards/royalties/IRoyaltyInfo.sol"; import "@openzeppelin/contracts-upgradeable/proxy/utils/Initializable.sol"; import "@openzeppelin/contracts-upgradeable/utils/introspection/ERC165Upgradeable.sol"; import "@openzeppelin/contracts-upgradeable/token/ERC721/ERC721Upgradeable.sol"; import "@openzeppelin/contracts-upgradeable/token/ERC721/extensions/ERC721BurnableUpgradeable.sol"; import "@openzeppelin/contracts-upgradeable/utils/AddressUpgradeable.sol"; import "./libraries/AddressLibrary.sol"; import "./mixins/collections/SequentialMintCollection.sol"; import "./mixins/collections/CollectionRoyalties.sol"; import "./mixins/shared/ContractFactory.sol"; /** * @title A collection of NFTs by a single creator. * @notice All NFTs from this contract are minted by the same creator. * A 10% royalty to the creator is included which may be split with collaborators on a per-NFT basis. * @author batu-inal & HardlyDifficult */ contract NFTCollection is INFTCollectionInitializer, IGetRoyalties, IGetFees, IRoyaltyInfo, ITokenCreator, ContractFactory, Initializable, ERC165Upgradeable, ERC721Upgradeable, ERC721BurnableUpgradeable, SequentialMintCollection, CollectionRoyalties { using AddressLibrary for address; using AddressUpgradeable for address; /** * @notice The baseURI to use for the tokenURI, if undefined then `ipfs://` is used. */ string private baseURI_; /** * @notice Stores hashes minted to prevent duplicates. * @dev 0 means not yet minted, set to 1 when minted. * For why using uint is better than using bool here: * github.com/OpenZeppelin/openzeppelin-contracts/blob/v4.7.3/contracts/security/ReentrancyGuard.sol#L23-L27 */ mapping(string => uint256) private cidToMinted; /** * @dev Stores an optional alternate address to receive creator revenue and royalty payments. * The target address may be a contract which could split or escrow payments. */ mapping(uint256 => address payable) private tokenIdToCreatorPaymentAddress; /** * @dev Stores a CID for each NFT. */ mapping(uint256 => string) private _tokenCIDs; /** * @notice Emitted when the owner changes the base URI to be used for NFTs in this collection. * @param baseURI The new base URI to use. */ event BaseURIUpdated(string baseURI); /** * @notice Emitted when a new NFT is minted. * @param creator The address of the collection owner at this time this NFT was minted. * @param tokenId The tokenId of the newly minted NFT. * @param indexedTokenCID The CID of the newly minted NFT, indexed to enable watching for mint events by the tokenCID. * @param tokenCID The actual CID of the newly minted NFT. */ event Minted(address indexed creator, uint256 indexed tokenId, string indexed indexedTokenCID, string tokenCID); /** * @notice Emitted when the payment address for creator royalties is set. * @param fromPaymentAddress The original address used for royalty payments. * @param toPaymentAddress The new address used for royalty payments. * @param tokenId The NFT which had the royalty payment address updated. */ event TokenCreatorPaymentAddressSet( address indexed fromPaymentAddress, address indexed toPaymentAddress, uint256 indexed tokenId ); /** * @notice Initialize the template's immutable variables. * @param _contractFactory The factory which will be used to create collection contracts. */ constructor(address _contractFactory) ContractFactory(_contractFactory) // solhint-disable-next-line no-empty-blocks {} /** * @notice Called by the contract factory on creation. * @param _creator The creator of this collection. * @param _name The collection's `name`. * @param _symbol The collection's `symbol`. */ function initialize( address payable _creator, string calldata _name, string calldata _symbol ) external initializer onlyContractFactory { __ERC721_init(_name, _symbol); _initializeSequentialMintCollection(_creator, 0); } /** * @notice Allows the creator to burn a specific token if they currently own the NFT. * @param tokenId The ID of the NFT to burn. * @dev The function here asserts `onlyOwner` while the super confirms ownership. */ function burn(uint256 tokenId) public override onlyOwner { super.burn(tokenId); } /** * @notice Mint an NFT defined by its metadata path. * @dev This is only callable by the collection creator/owner. * @param tokenCID The CID for the metadata json of the NFT to mint. * @return tokenId The tokenId of the newly minted NFT. */ function mint(string calldata tokenCID) external returns (uint256 tokenId) { tokenId = _mint(tokenCID); } /** * @notice Mint an NFT defined by its metadata path and approves the provided operator address. * @dev This is only callable by the collection creator/owner. * It can be used the first time they mint to save having to issue a separate approval * transaction before listing the NFT for sale. * @param tokenCID The CID for the metadata json of the NFT to mint. * @param operator The address to set as an approved operator for the creator's account. * @return tokenId The tokenId of the newly minted NFT. */ function mintAndApprove(string calldata tokenCID, address operator) external returns (uint256 tokenId) { tokenId = _mint(tokenCID); setApprovalForAll(operator, true); } /** * @notice Mint an NFT defined by its metadata path and have creator revenue/royalties sent to an alternate address. * @dev This is only callable by the collection creator/owner. * @param tokenCID The CID for the metadata json of the NFT to mint. * @param tokenCreatorPaymentAddress The royalty recipient address to use for this NFT. * @return tokenId The tokenId of the newly minted NFT. */ function mintWithCreatorPaymentAddress(string calldata tokenCID, address payable tokenCreatorPaymentAddress) public returns (uint256 tokenId) { require(tokenCreatorPaymentAddress != address(0), "NFTCollection: tokenCreatorPaymentAddress is required"); tokenId = _mint(tokenCID); tokenIdToCreatorPaymentAddress[tokenId] = tokenCreatorPaymentAddress; emit TokenCreatorPaymentAddressSet(address(0), tokenCreatorPaymentAddress, tokenId); } /** * @notice Mint an NFT defined by its metadata path and approves the provided operator address. * @dev This is only callable by the collection creator/owner. * It can be used the first time they mint to save having to issue a separate approval * transaction before listing the NFT for sale. * @param tokenCID The CID for the metadata json of the NFT to mint. * @param tokenCreatorPaymentAddress The royalty recipient address to use for this NFT. * @param operator The address to set as an approved operator for the creator's account. * @return tokenId The tokenId of the newly minted NFT. */ function mintWithCreatorPaymentAddressAndApprove( string calldata tokenCID, address payable tokenCreatorPaymentAddress, address operator ) external returns (uint256 tokenId) { tokenId = mintWithCreatorPaymentAddress(tokenCID, tokenCreatorPaymentAddress); setApprovalForAll(operator, true); } /** * @notice Mint an NFT defined by its metadata path and have creator revenue/royalties sent to an alternate address * which is defined by a contract call, typically a proxy contract address representing the payment terms. * @dev This is only callable by the collection creator/owner. * @param tokenCID The CID for the metadata json of the NFT to mint. * @param paymentAddressFactory The contract to call which will return the address to use for payments. * @param paymentAddressCall The call details to send to the factory provided. * @return tokenId The tokenId of the newly minted NFT. */ function mintWithCreatorPaymentFactory( string calldata tokenCID, address paymentAddressFactory, bytes calldata paymentAddressCall ) public returns (uint256 tokenId) { address payable tokenCreatorPaymentAddress = paymentAddressFactory.callAndReturnContractAddress(paymentAddressCall); tokenId = mintWithCreatorPaymentAddress(tokenCID, tokenCreatorPaymentAddress); } /** * @notice Mint an NFT defined by its metadata path and have creator revenue/royalties sent to an alternate address * which is defined by a contract call, typically a proxy contract address representing the payment terms. * @dev This is only callable by the collection creator/owner. * It can be used the first time they mint to save having to issue a separate approval * transaction before listing the NFT for sale. * @param tokenCID The CID for the metadata json of the NFT to mint. * @param paymentAddressFactory The contract to call which will return the address to use for payments. * @param paymentAddressCall The call details to send to the factory provided. * @param operator The address to set as an approved operator for the creator's account. * @return tokenId The tokenId of the newly minted NFT. */ function mintWithCreatorPaymentFactoryAndApprove( string calldata tokenCID, address paymentAddressFactory, bytes calldata paymentAddressCall, address operator ) external returns (uint256 tokenId) { tokenId = mintWithCreatorPaymentFactory(tokenCID, paymentAddressFactory, paymentAddressCall); setApprovalForAll(operator, true); } /** * @notice Allows the collection creator to destroy this contract only if * no NFTs have been minted yet or the minted NFTs have been burned. * @dev Once destructed, a new collection could be deployed to this address (although that's discouraged). */ function selfDestruct() external onlyOwner { _selfDestruct(); } /** * @notice Allows the owner to assign a baseURI to use for the tokenURI instead of the default `ipfs://`. * @param baseURIOverride The new base URI to use for all NFTs in this collection. */ function updateBaseURI(string calldata baseURIOverride) external onlyOwner { baseURI_ = baseURIOverride; emit BaseURIUpdated(baseURIOverride); } /** * @notice Allows the owner to set a max tokenID. * This provides a guarantee to collectors about the limit of this collection contract, if applicable. * @dev Once this value has been set, it may be decreased but can never be increased. * This max may be more than the final `totalSupply` if 1 or more tokens were burned. * @param _maxTokenId The max tokenId to set, all NFTs must have a tokenId less than or equal to this value. */ function updateMaxTokenId(uint32 _maxTokenId) external onlyOwner { _updateMaxTokenId(_maxTokenId); } function _burn(uint256 tokenId) internal override(ERC721Upgradeable, SequentialMintCollection) { delete cidToMinted[_tokenCIDs[tokenId]]; delete tokenIdToCreatorPaymentAddress[tokenId]; delete _tokenCIDs[tokenId]; super._burn(tokenId); } function _mint(string calldata tokenCID) private onlyOwner returns (uint256 tokenId) { require(bytes(tokenCID).length != 0, "NFTCollection: tokenCID is required"); require(cidToMinted[tokenCID] == 0, "NFTCollection: NFT was already minted"); // Number of tokens cannot realistically overflow 32 bits. tokenId = ++latestTokenId; require(maxTokenId == 0 || tokenId <= maxTokenId, "NFTCollection: Max token count has already been minted"); cidToMinted[tokenCID] = 1; _tokenCIDs[tokenId] = tokenCID; _safeMint(msg.sender, tokenId); emit Minted(msg.sender, tokenId, tokenCID, tokenCID); } /** * @notice The base URI used for all NFTs in this collection. * @dev The `tokenCID` is appended to this to obtain an NFT's `tokenURI`. * e.g. The URI for a token with the `tokenCID`: "foo" and `baseURI`: "ipfs://" is "ipfs://foo". * @return uri The base URI used by this collection. */ function baseURI() external view returns (string memory uri) { uri = _baseURI(); } /** * @notice Checks if the creator has already minted a given NFT using this collection contract. * @param tokenCID The CID to check for. * @return hasBeenMinted True if the creator has already minted an NFT with this CID. */ function getHasMintedCID(string calldata tokenCID) external view returns (bool hasBeenMinted) { hasBeenMinted = cidToMinted[tokenCID] != 0; } /** * @inheritdoc CollectionRoyalties */ function getTokenCreatorPaymentAddress(uint256 tokenId) public view override returns (address payable creatorPaymentAddress) { creatorPaymentAddress = tokenIdToCreatorPaymentAddress[tokenId]; if (creatorPaymentAddress == address(0)) { creatorPaymentAddress = owner; } } /** * @inheritdoc IERC165Upgradeable */ function supportsInterface(bytes4 interfaceId) public view override(ERC165Upgradeable, ERC721Upgradeable, CollectionRoyalties) returns (bool interfaceSupported) { // This is a no-op function required to avoid compile errors. interfaceSupported = super.supportsInterface(interfaceId); } /** * @inheritdoc IERC721MetadataUpgradeable */ function tokenURI(uint256 tokenId) public view override returns (string memory uri) { require(_exists(tokenId), "NFTCollection: URI query for nonexistent token"); uri = string.concat(_baseURI(), _tokenCIDs[tokenId]); } function _baseURI() internal view override returns (string memory uri) { uri = baseURI_; if (bytes(uri).length == 0) { uri = "ipfs://"; } } }
// SPDX-License-Identifier: MIT OR Apache-2.0 pragma solidity ^0.8.12; import "@openzeppelin/contracts-upgradeable/utils/AddressUpgradeable.sol"; struct CallWithoutValue { address target; bytes callData; } /** * @title A library for address helpers not already covered by the OZ library. * @author batu-inal & HardlyDifficult */ library AddressLibrary { using AddressUpgradeable for address; using AddressUpgradeable for address payable; /** * @notice Calls an external contract with arbitrary data and parse the return value into an address. * @param externalContract The address of the contract to call. * @param callData The data to send to the contract. * @return contractAddress The address of the contract returned by the call. */ function callAndReturnContractAddress(address externalContract, bytes calldata callData) internal returns (address payable contractAddress) { bytes memory returnData = externalContract.functionCall(callData); contractAddress = abi.decode(returnData, (address)); require(contractAddress.isContract(), "InternalProxyCall: did not return a contract"); } function callAndReturnContractAddress(CallWithoutValue calldata call) internal returns (address payable contractAddress) { contractAddress = callAndReturnContractAddress(call.target, call.callData); } }
// SPDX-License-Identifier: MIT OR Apache-2.0 pragma solidity ^0.8.12; /** * @author batu-inal & HardlyDifficult */ interface INFTCollectionInitializer { function initialize( address payable _creator, string memory _name, string memory _symbol ) external; }
// SPDX-License-Identifier: MIT OR Apache-2.0 pragma solidity ^0.8.12; import "@openzeppelin/contracts-upgradeable/proxy/utils/Initializable.sol"; import "@openzeppelin/contracts-upgradeable/token/ERC721/extensions/ERC721BurnableUpgradeable.sol"; import "../../interfaces/standards/royalties/ITokenCreator.sol"; /** * @title Extends the OZ ERC721 implementation for collections which mint sequential token IDs. * @author batu-inal & HardlyDifficult */ abstract contract SequentialMintCollection is ITokenCreator, Initializable, ERC721BurnableUpgradeable { /****** Slot 0 (after inheritance) ******/ /** * @notice The creator/owner of this NFT collection. * @dev This is the default royalty recipient if a different `paymentAddress` was not provided. * @return The collection's creator/owner address. */ address payable public owner; /** * @notice The tokenId of the most recently created NFT. * @dev Minting starts at tokenId 1. Each mint will use this value + 1. * @return The most recently minted tokenId, or 0 if no NFTs have been minted yet. */ uint32 public latestTokenId; /** * @notice The max tokenId which can be minted. * @dev This max may be less than the final `totalSupply` if 1 or more tokens were burned. * @return The max tokenId which can be minted. */ uint32 public maxTokenId; /** * @notice Tracks how many tokens have been burned. * @dev This number is used to calculate the total supply efficiently. */ uint32 private burnCounter; /****** End of storage ******/ /** * @notice Emitted when the max tokenId supported by this collection is updated. * @param maxTokenId The new max tokenId. All NFTs in this collection will have a tokenId less than * or equal to this value. */ event MaxTokenIdUpdated(uint256 indexed maxTokenId); /** * @notice Emitted when this collection is self destructed by the creator/owner/admin. * @param admin The account which requested this contract be self destructed. */ event SelfDestruct(address indexed admin); modifier onlyOwner() { require(msg.sender == owner, "SequentialMintCollection: Caller is not owner"); _; } function _initializeSequentialMintCollection(address payable _creator, uint32 _maxTokenId) internal onlyInitializing { owner = _creator; maxTokenId = _maxTokenId; } /** * @notice Allows the collection owner to destroy this contract only if * no NFTs have been minted yet or the minted NFTs have been burned. */ function _selfDestruct() internal { require(totalSupply() == 0, "SequentialMintCollection: Any NFTs minted must be burned first"); emit SelfDestruct(msg.sender); selfdestruct(payable(msg.sender)); } /** * @notice Allows the owner to set a max tokenID. * This provides a guarantee to collectors about the limit of this collection contract, if applicable. * @dev Once this value has been set, it may be decreased but can never be increased. * @param _maxTokenId The max tokenId to set, all NFTs must have a tokenId less than or equal to this value. */ function _updateMaxTokenId(uint32 _maxTokenId) internal { require(_maxTokenId != 0, "SequentialMintCollection: Max token ID may not be cleared"); require(maxTokenId == 0 || _maxTokenId < maxTokenId, "SequentialMintCollection: Max token ID may not increase"); require(latestTokenId <= _maxTokenId, "SequentialMintCollection: Max token ID must be >= last mint"); maxTokenId = _maxTokenId; emit MaxTokenIdUpdated(_maxTokenId); } function _burn(uint256 tokenId) internal virtual override { unchecked { // Number of burned tokens cannot exceed latestTokenId which is the same size. ++burnCounter; } super._burn(tokenId); } /** * @inheritdoc ITokenCreator * @dev The tokenId param is ignored since all NFTs return the same value. */ function tokenCreator( uint256 /* tokenId */ ) external view returns (address payable creator) { creator = owner; } /** * @notice Returns the total amount of tokens stored by the contract. * @dev From the ERC-721 enumerable standard. * @return supply The total number of NFTs tracked by this contract. */ function totalSupply() public view returns (uint256 supply) { unchecked { // Number of tokens minted is always >= burned tokens. supply = latestTokenId - burnCounter; } } }
// SPDX-License-Identifier: MIT OR Apache-2.0 pragma solidity ^0.8.12; import "@openzeppelin/contracts-upgradeable/utils/introspection/ERC165Upgradeable.sol"; import "../../interfaces/standards/royalties/IGetFees.sol"; import "../../interfaces/standards/royalties/IGetRoyalties.sol"; import "../../interfaces/standards/royalties/IRoyaltyInfo.sol"; import "../../interfaces/standards/royalties/ITokenCreator.sol"; import "../shared/Constants.sol"; /** * @title Defines various royalty APIs for broad marketplace support. * @author batu-inal & HardlyDifficult */ abstract contract CollectionRoyalties is IGetRoyalties, IGetFees, IRoyaltyInfo, ITokenCreator, ERC165Upgradeable { /** * @inheritdoc IGetFees */ function getFeeRecipients(uint256 tokenId) external view returns (address payable[] memory recipients) { recipients = new address payable[](1); recipients[0] = getTokenCreatorPaymentAddress(tokenId); } /** * @inheritdoc IGetFees * @dev The tokenId param is ignored since all NFTs return the same value. */ function getFeeBps( uint256 /* tokenId */ ) external pure returns (uint256[] memory royaltiesInBasisPoints) { royaltiesInBasisPoints = new uint256[](1); royaltiesInBasisPoints[0] = ROYALTY_IN_BASIS_POINTS; } /** * @inheritdoc IGetRoyalties */ function getRoyalties(uint256 tokenId) external view returns (address payable[] memory recipients, uint256[] memory royaltiesInBasisPoints) { recipients = new address payable[](1); recipients[0] = getTokenCreatorPaymentAddress(tokenId); royaltiesInBasisPoints = new uint256[](1); royaltiesInBasisPoints[0] = ROYALTY_IN_BASIS_POINTS; } /** * @notice The address to pay the creator proceeds/royalties for the collection. * @param tokenId The ID of the NFT to get the creator payment address for. * @return creatorPaymentAddress The address to which royalties should be paid. */ function getTokenCreatorPaymentAddress(uint256 tokenId) public view virtual returns (address payable creatorPaymentAddress); /** * @inheritdoc IRoyaltyInfo */ function royaltyInfo(uint256 tokenId, uint256 salePrice) external view returns (address receiver, uint256 royaltyAmount) { receiver = getTokenCreatorPaymentAddress(tokenId); unchecked { royaltyAmount = salePrice / ROYALTY_RATIO; } } /** * @inheritdoc IERC165Upgradeable * @dev Checks the supported royalty interfaces. */ function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool interfaceSupported) { interfaceSupported = (interfaceId == type(IRoyaltyInfo).interfaceId || interfaceId == type(ITokenCreator).interfaceId || interfaceId == type(IGetRoyalties).interfaceId || interfaceId == type(IGetFees).interfaceId || super.supportsInterface(interfaceId)); } }
// SPDX-License-Identifier: MIT OR Apache-2.0 pragma solidity ^0.8.12; import "@openzeppelin/contracts-upgradeable/utils/AddressUpgradeable.sol"; /** * @title Stores a reference to the factory which is used to create contract proxies. * @author batu-inal & HardlyDifficult */ abstract contract ContractFactory { using AddressUpgradeable for address; /** * @notice The address of the factory which was used to create this contract. * @return The factory contract address. */ address public immutable contractFactory; modifier onlyContractFactory() { require(msg.sender == contractFactory, "ContractFactory: Caller is not the factory"); _; } /** * @notice Initialize the template's immutable variables. * @param _contractFactory The factory which will be used to create these contracts. */ constructor(address _contractFactory) { require(_contractFactory.isContract(), "ContractFactory: Factory is not a contract"); contractFactory = _contractFactory; } }
// SPDX-License-Identifier: MIT OR Apache-2.0 pragma solidity ^0.8.12; interface IGetRoyalties { /** * @notice Get the creator royalties to be sent. * @dev The data is the same as when calling `getFeeRecipients` and `getFeeBps` separately. * @param tokenId The ID of the NFT to get royalties for. * @return recipients An array of addresses to which royalties should be sent. * @return royaltiesInBasisPoints The array of fees to be sent to each recipient, in basis points. */ function getRoyalties(uint256 tokenId) external view returns (address payable[] memory recipients, uint256[] memory royaltiesInBasisPoints); }
// SPDX-License-Identifier: MIT OR Apache-2.0 pragma solidity ^0.8.12; interface ITokenCreator { /** * @notice Returns the creator of this NFT collection. * @param tokenId The ID of the NFT to get the creator payment address for. * @return creator The creator of this collection. */ function tokenCreator(uint256 tokenId) external view returns (address payable creator); }
// SPDX-License-Identifier: MIT OR Apache-2.0 pragma solidity ^0.8.12; /** * @notice An interface for communicating fees to 3rd party marketplaces. * @dev Originally implemented in mainnet contract 0x44d6e8933f8271abcf253c72f9ed7e0e4c0323b3 */ interface IGetFees { /** * @notice Get the recipient addresses to which creator royalties should be sent. * @dev The expected royalty amounts are communicated with `getFeeBps`. * @param tokenId The ID of the NFT to get royalties for. * @return recipients An array of addresses to which royalties should be sent. */ function getFeeRecipients(uint256 tokenId) external view returns (address payable[] memory recipients); /** * @notice Get the creator royalty amounts to be sent to each recipient, in basis points. * @dev The expected recipients are communicated with `getFeeRecipients`. * @param tokenId The ID of the NFT to get royalties for. * @return royaltiesInBasisPoints The array of fees to be sent to each recipient, in basis points. */ function getFeeBps(uint256 tokenId) external view returns (uint256[] memory royaltiesInBasisPoints); }
// SPDX-License-Identifier: MIT OR Apache-2.0 pragma solidity ^0.8.12; /** * @notice Interface for EIP-2981: NFT Royalty Standard. * For more see: https://eips.ethereum.org/EIPS/eip-2981. */ interface IRoyaltyInfo { /** * @notice Get the creator royalties to be sent. * @param tokenId The ID of the NFT to get royalties for. * @param salePrice The total price of the sale. * @return receiver The address to which royalties should be sent. * @return royaltyAmount The total amount that should be sent to the `receiver`. */ function royaltyInfo(uint256 tokenId, uint256 salePrice) external view returns (address receiver, uint256 royaltyAmount); }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.7.0) (proxy/utils/Initializable.sol) pragma solidity ^0.8.2; 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 proxied contracts do not make use of 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. * * The initialization functions use a version number. Once a version number is used, it is consumed and cannot be * reused. This mechanism prevents re-execution of each "step" but allows the creation of new initialization steps in * case an upgrade adds a module that needs to be initialized. * * For example: * * [.hljs-theme-light.nopadding] * ``` * contract MyToken is ERC20Upgradeable { * function initialize() initializer public { * __ERC20_init("MyToken", "MTK"); * } * } * contract MyTokenV2 is MyToken, ERC20PermitUpgradeable { * function initializeV2() reinitializer(2) public { * __ERC20Permit_init("MyToken"); * } * } * ``` * * 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 prevent the implementation contract from being used, you should invoke * the {_disableInitializers} function in the constructor to automatically lock it when it is deployed: * * [.hljs-theme-light.nopadding] * ``` * /// @custom:oz-upgrades-unsafe-allow constructor * constructor() { * _disableInitializers(); * } * ``` * ==== */ abstract contract Initializable { /** * @dev Indicates that the contract has been initialized. * @custom:oz-retyped-from bool */ uint8 private _initialized; /** * @dev Indicates that the contract is in the process of being initialized. */ bool private _initializing; /** * @dev Triggered when the contract has been initialized or reinitialized. */ event Initialized(uint8 version); /** * @dev A modifier that defines a protected initializer function that can be invoked at most once. In its scope, * `onlyInitializing` functions can be used to initialize parent contracts. Equivalent to `reinitializer(1)`. */ modifier initializer() { bool isTopLevelCall = !_initializing; require( (isTopLevelCall && _initialized < 1) || (!AddressUpgradeable.isContract(address(this)) && _initialized == 1), "Initializable: contract is already initialized" ); _initialized = 1; if (isTopLevelCall) { _initializing = true; } _; if (isTopLevelCall) { _initializing = false; emit Initialized(1); } } /** * @dev A modifier that defines a protected reinitializer function that can be invoked at most once, and only if the * contract hasn't been initialized to a greater version before. In its scope, `onlyInitializing` functions can be * used to initialize parent contracts. * * `initializer` is equivalent to `reinitializer(1)`, so a reinitializer may be used after the original * initialization step. This is essential to configure modules that are added through upgrades and that require * initialization. * * Note that versions can jump in increments greater than 1; this implies that if multiple reinitializers coexist in * a contract, executing them in the right order is up to the developer or operator. */ modifier reinitializer(uint8 version) { require(!_initializing && _initialized < version, "Initializable: contract is already initialized"); _initialized = version; _initializing = true; _; _initializing = false; emit Initialized(version); } /** * @dev Modifier to protect an initialization function so that it can only be invoked by functions with the * {initializer} and {reinitializer} modifiers, directly or indirectly. */ modifier onlyInitializing() { require(_initializing, "Initializable: contract is not initializing"); _; } /** * @dev Locks the contract, preventing any future reinitialization. This cannot be part of an initializer call. * Calling this in the constructor of a contract will prevent that contract from being initialized or reinitialized * to any version. It is recommended to use this to lock implementation contracts that are designed to be called * through proxies. */ function _disableInitializers() internal virtual { require(!_initializing, "Initializable: contract is initializing"); if (_initialized < type(uint8).max) { _initialized = type(uint8).max; emit Initialized(type(uint8).max); } } }
// 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 { } 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; } /** * @dev This empty reserved space is put in place to allow future versions to add new * variables without shifting down storage in the inheritance chain. * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps */ uint256[50] private __gap; }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.7.0) (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 { __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: address zero is not a valid owner"); 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: invalid token ID"); 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) { _requireMinted(tokenId); 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 overridden 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 token owner nor approved for all" ); _approve(to, tokenId); } /** * @dev See {IERC721-getApproved}. */ function getApproved(uint256 tokenId) public view virtual override returns (address) { _requireMinted(tokenId); 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: caller is not token 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: caller is not token 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) { address owner = ERC721Upgradeable.ownerOf(tokenId); return (spender == owner || isApprovedForAll(owner, spender) || getApproved(tokenId) == 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); _afterTokenTransfer(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); _afterTokenTransfer(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 from incorrect owner"); 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); _afterTokenTransfer(from, to, tokenId); } /** * @dev Approve `to` to operate on `tokenId` * * Emits an {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 an {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 Reverts if the `tokenId` has not been minted yet. */ function _requireMinted(uint256 tokenId) internal view virtual { require(_exists(tokenId), "ERC721: invalid token ID"); } /** * @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 { /// @solidity memory-safe-assembly assembly { revert(add(32, reason), mload(reason)) } } } } else { return true; } } /** * @dev Hook that is called before any token transfer. This includes minting * and burning. * * Calling conditions: * * - When `from` and `to` are both non-zero, ``from``'s `tokenId` will be * transferred to `to`. * - When `from` is zero, `tokenId` will be minted for `to`. * - When `to` is zero, ``from``'s `tokenId` will be burned. * - `from` 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 {} /** * @dev Hook that is called after any transfer of tokens. This includes * minting and burning. * * Calling conditions: * * - when `from` and `to` are both non-zero. * - `from` and `to` are never both zero. * * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks]. */ function _afterTokenTransfer( address from, address to, uint256 tokenId ) internal virtual {} /** * @dev This empty reserved space is put in place to allow future versions to add new * variables without shifting down storage in the inheritance chain. * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps */ uint256[44] private __gap; }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.7.0) (utils/Address.sol) pragma solidity ^0.8.1; /** * @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 * ==== * * [IMPORTANT] * ==== * You shouldn't rely on `isContract` to protect against flash loan attacks! * * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract * constructor. * ==== */ function isContract(address account) internal view returns (bool) { // This method relies on extcodesize/address.code.length, which returns 0 // for contracts in construction, since the code is only stored at the end // of the constructor execution. return account.code.length > 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 /// @solidity memory-safe-assembly assembly { let returndata_size := mload(returndata) revert(add(32, returndata), returndata_size) } } else { revert(errorMessage); } } } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.7.0) (token/ERC721/extensions/ERC721Burnable.sol) pragma solidity ^0.8.0; import "../ERC721Upgradeable.sol"; import "../../../utils/ContextUpgradeable.sol"; import "../../../proxy/utils/Initializable.sol"; /** * @title ERC721 Burnable Token * @dev ERC721 Token that can be burned (destroyed). */ abstract contract ERC721BurnableUpgradeable is Initializable, ContextUpgradeable, ERC721Upgradeable { function __ERC721Burnable_init() internal onlyInitializing { } function __ERC721Burnable_init_unchained() internal onlyInitializing { } /** * @dev Burns `tokenId`. See {ERC721-_burn}. * * Requirements: * * - The caller must own `tokenId` or be an approved operator. */ function burn(uint256 tokenId) public virtual { //solhint-disable-next-line max-line-length require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: caller is not token owner nor approved"); _burn(tokenId); } /** * @dev This empty reserved space is put in place to allow future versions to add new * variables without shifting down storage in the inheritance chain. * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps */ uint256[50] private __gap; }
// 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 { } 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; } /** * @dev This empty reserved space is put in place to allow future versions to add new * variables without shifting down storage in the inheritance chain. * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps */ uint256[50] private __gap; }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.7.0) (utils/Strings.sol) pragma solidity ^0.8.0; /** * @dev String operations. */ library StringsUpgradeable { bytes16 private constant _HEX_SYMBOLS = "0123456789abcdef"; uint8 private constant _ADDRESS_LENGTH = 20; /** * @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); } /** * @dev Converts an `address` with fixed length of 20 bytes to its not checksummed ASCII `string` hexadecimal representation. */ function toHexString(address addr) internal pure returns (string memory) { return toHexString(uint256(uint160(addr)), _ADDRESS_LENGTH); } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.7.0) (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`. * * 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; /** * @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 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 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 the account approved for `tokenId` token. * * Requirements: * * - `tokenId` must exist. */ function getApproved(uint256 tokenId) external view returns (address operator); /** * @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); }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.6.0) (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 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 `IERC721Receiver.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/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 (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 OR Apache-2.0 pragma solidity ^0.8.12; /// Constant values shared across mixins. /** * @dev 100% in basis points. */ uint256 constant BASIS_POINTS = 10_000; /** * @dev The default admin role defined by OZ ACL modules. */ bytes32 constant DEFAULT_ADMIN_ROLE = 0x00; /** * @dev Cap the number of royalty recipients. * A cap is required to ensure gas costs are not too high when a sale is settled. */ uint256 constant MAX_ROYALTY_RECIPIENTS = 5; /** * @dev The minimum increase of 10% required when making an offer or placing a bid. */ uint256 constant MIN_PERCENT_INCREMENT_DENOMINATOR = BASIS_POINTS / 1_000; /** * @dev The gas limit used when making external read-only calls. * This helps to ensure that external calls does not prevent the market from executing. */ uint256 constant READ_ONLY_GAS_LIMIT = 40_000; /** * @dev Default royalty cut paid out on secondary sales. * Set to 10% of the secondary sale. */ uint96 constant ROYALTY_IN_BASIS_POINTS = 1_000; /** * @dev 10%, expressed as a denominator for more efficient calculations. */ uint256 constant ROYALTY_RATIO = BASIS_POINTS / ROYALTY_IN_BASIS_POINTS; /** * @dev The gas limit to send ETH to multiple recipients, enough for a 5-way split. */ uint256 constant SEND_VALUE_GAS_LIMIT_MULTIPLE_RECIPIENTS = 210_000; /** * @dev The gas limit to send ETH to a single recipient, enough for a contract with a simple receiver. */ uint256 constant SEND_VALUE_GAS_LIMIT_SINGLE_RECIPIENT = 20_000;
// SPDX-License-Identifier: UNLICENSED pragma solidity >=0.6.0; import "../contracts/NFTCollection.sol"; contract $NFTCollection is NFTCollection { bytes32 public __hh_exposed_bytecode_marker = "hardhat-exposed"; constructor(address _contractFactory) NFTCollection(_contractFactory) {} function $_burn(uint256 tokenId) external { return super._burn(tokenId); } function $_baseURI() external view returns (string memory) { return super._baseURI(); } function $_initializeSequentialMintCollection(address payable _creator,uint32 _maxTokenId) external { return super._initializeSequentialMintCollection(_creator,_maxTokenId); } function $_selfDestruct() external { return super._selfDestruct(); } function $_updateMaxTokenId(uint32 _maxTokenId) external { return super._updateMaxTokenId(_maxTokenId); } function $__ERC721Burnable_init() external { return super.__ERC721Burnable_init(); } function $__ERC721Burnable_init_unchained() external { return super.__ERC721Burnable_init_unchained(); } function $__ERC721_init(string calldata name_,string calldata symbol_) external { return super.__ERC721_init(name_,symbol_); } function $__ERC721_init_unchained(string calldata name_,string calldata symbol_) external { return super.__ERC721_init_unchained(name_,symbol_); } function $_safeTransfer(address from,address to,uint256 tokenId,bytes calldata data) external { return super._safeTransfer(from,to,tokenId,data); } function $_exists(uint256 tokenId) external view returns (bool) { return super._exists(tokenId); } function $_isApprovedOrOwner(address spender,uint256 tokenId) external view returns (bool) { return super._isApprovedOrOwner(spender,tokenId); } function $_safeMint(address to,uint256 tokenId) external { return super._safeMint(to,tokenId); } function $_safeMint(address to,uint256 tokenId,bytes calldata data) external { return super._safeMint(to,tokenId,data); } function $_mint(address to,uint256 tokenId) external { return super._mint(to,tokenId); } function $_transfer(address from,address to,uint256 tokenId) external { return super._transfer(from,to,tokenId); } function $_approve(address to,uint256 tokenId) external { return super._approve(to,tokenId); } function $_setApprovalForAll(address owner,address operator,bool approved) external { return super._setApprovalForAll(owner,operator,approved); } function $_requireMinted(uint256 tokenId) external view { return super._requireMinted(tokenId); } function $_beforeTokenTransfer(address from,address to,uint256 tokenId) external { return super._beforeTokenTransfer(from,to,tokenId); } function $_afterTokenTransfer(address from,address to,uint256 tokenId) external { return super._afterTokenTransfer(from,to,tokenId); } function $__ERC165_init() external { return super.__ERC165_init(); } function $__ERC165_init_unchained() external { return super.__ERC165_init_unchained(); } function $__Context_init() external { return super.__Context_init(); } function $__Context_init_unchained() external { return super.__Context_init_unchained(); } function $_msgSender() external view returns (address) { return super._msgSender(); } function $_msgData() external view returns (bytes memory) { return super._msgData(); } function $_disableInitializers() external { return super._disableInitializers(); } receive() external payable {} }
// SPDX-License-Identifier: UNLICENSED pragma solidity >=0.6.0; import "../../../contracts/interfaces/internal/INFTCollectionInitializer.sol"; abstract contract $INFTCollectionInitializer is INFTCollectionInitializer { bytes32 public __hh_exposed_bytecode_marker = "hardhat-exposed"; constructor() {} receive() external payable {} }
// SPDX-License-Identifier: UNLICENSED pragma solidity >=0.6.0; import "../../../../contracts/interfaces/standards/royalties/IGetFees.sol"; abstract contract $IGetFees is IGetFees { bytes32 public __hh_exposed_bytecode_marker = "hardhat-exposed"; constructor() {} receive() external payable {} }
// SPDX-License-Identifier: UNLICENSED pragma solidity >=0.6.0; import "../../../../contracts/interfaces/standards/royalties/IGetRoyalties.sol"; abstract contract $IGetRoyalties is IGetRoyalties { bytes32 public __hh_exposed_bytecode_marker = "hardhat-exposed"; constructor() {} receive() external payable {} }
// SPDX-License-Identifier: UNLICENSED pragma solidity >=0.6.0; import "../../../../contracts/interfaces/standards/royalties/IRoyaltyInfo.sol"; abstract contract $IRoyaltyInfo is IRoyaltyInfo { bytes32 public __hh_exposed_bytecode_marker = "hardhat-exposed"; constructor() {} receive() external payable {} }
// SPDX-License-Identifier: UNLICENSED pragma solidity >=0.6.0; import "../../../../contracts/interfaces/standards/royalties/ITokenCreator.sol"; abstract contract $ITokenCreator is ITokenCreator { bytes32 public __hh_exposed_bytecode_marker = "hardhat-exposed"; constructor() {} receive() external payable {} }
// SPDX-License-Identifier: UNLICENSED pragma solidity >=0.6.0; import "../../contracts/libraries/AddressLibrary.sol"; contract $AddressLibrary { bytes32 public __hh_exposed_bytecode_marker = "hardhat-exposed"; event $callAndReturnContractAddress_address_bytes_Returned(address payable arg0); event $callAndReturnContractAddress_CallWithoutValue_Returned(address payable arg0); constructor() {} function $callAndReturnContractAddress(address externalContract,bytes calldata callData) external payable returns (address payable) { (address payable ret0) = AddressLibrary.callAndReturnContractAddress(externalContract,callData); emit $callAndReturnContractAddress_address_bytes_Returned(ret0); return (ret0); } function $callAndReturnContractAddress(CallWithoutValue calldata call) external payable returns (address payable) { (address payable ret0) = AddressLibrary.callAndReturnContractAddress(call); emit $callAndReturnContractAddress_CallWithoutValue_Returned(ret0); return (ret0); } receive() external payable {} }
// SPDX-License-Identifier: UNLICENSED pragma solidity >=0.6.0; import "../../../contracts/mixins/collections/CollectionRoyalties.sol"; abstract contract $CollectionRoyalties is CollectionRoyalties { bytes32 public __hh_exposed_bytecode_marker = "hardhat-exposed"; constructor() {} function $__ERC165_init() external { return super.__ERC165_init(); } function $__ERC165_init_unchained() external { return super.__ERC165_init_unchained(); } function $_disableInitializers() external { return super._disableInitializers(); } receive() external payable {} }
// SPDX-License-Identifier: UNLICENSED pragma solidity >=0.6.0; import "../../../contracts/mixins/collections/SequentialMintCollection.sol"; contract $SequentialMintCollection is SequentialMintCollection { bytes32 public __hh_exposed_bytecode_marker = "hardhat-exposed"; constructor() {} function $_initializeSequentialMintCollection(address payable _creator,uint32 _maxTokenId) external { return super._initializeSequentialMintCollection(_creator,_maxTokenId); } function $_selfDestruct() external { return super._selfDestruct(); } function $_updateMaxTokenId(uint32 _maxTokenId) external { return super._updateMaxTokenId(_maxTokenId); } function $_burn(uint256 tokenId) external { return super._burn(tokenId); } function $__ERC721Burnable_init() external { return super.__ERC721Burnable_init(); } function $__ERC721Burnable_init_unchained() external { return super.__ERC721Burnable_init_unchained(); } function $__ERC721_init(string calldata name_,string calldata symbol_) external { return super.__ERC721_init(name_,symbol_); } function $__ERC721_init_unchained(string calldata name_,string calldata symbol_) external { return super.__ERC721_init_unchained(name_,symbol_); } function $_baseURI() external view returns (string memory) { return super._baseURI(); } function $_safeTransfer(address from,address to,uint256 tokenId,bytes calldata data) external { return super._safeTransfer(from,to,tokenId,data); } function $_exists(uint256 tokenId) external view returns (bool) { return super._exists(tokenId); } function $_isApprovedOrOwner(address spender,uint256 tokenId) external view returns (bool) { return super._isApprovedOrOwner(spender,tokenId); } function $_safeMint(address to,uint256 tokenId) external { return super._safeMint(to,tokenId); } function $_safeMint(address to,uint256 tokenId,bytes calldata data) external { return super._safeMint(to,tokenId,data); } function $_mint(address to,uint256 tokenId) external { return super._mint(to,tokenId); } function $_transfer(address from,address to,uint256 tokenId) external { return super._transfer(from,to,tokenId); } function $_approve(address to,uint256 tokenId) external { return super._approve(to,tokenId); } function $_setApprovalForAll(address owner,address operator,bool approved) external { return super._setApprovalForAll(owner,operator,approved); } function $_requireMinted(uint256 tokenId) external view { return super._requireMinted(tokenId); } function $_beforeTokenTransfer(address from,address to,uint256 tokenId) external { return super._beforeTokenTransfer(from,to,tokenId); } function $_afterTokenTransfer(address from,address to,uint256 tokenId) external { return super._afterTokenTransfer(from,to,tokenId); } function $__ERC165_init() external { return super.__ERC165_init(); } function $__ERC165_init_unchained() external { return super.__ERC165_init_unchained(); } function $__Context_init() external { return super.__Context_init(); } function $__Context_init_unchained() external { return super.__Context_init_unchained(); } function $_msgSender() external view returns (address) { return super._msgSender(); } function $_msgData() external view returns (bytes memory) { return super._msgData(); } function $_disableInitializers() external { return super._disableInitializers(); } receive() external payable {} }
// SPDX-License-Identifier: UNLICENSED pragma solidity >=0.6.0; import "../../../contracts/mixins/shared/Constants.sol";
// SPDX-License-Identifier: UNLICENSED pragma solidity >=0.6.0; import "../../../contracts/mixins/shared/ContractFactory.sol"; contract $ContractFactory is ContractFactory { bytes32 public __hh_exposed_bytecode_marker = "hardhat-exposed"; constructor(address _contractFactory) ContractFactory(_contractFactory) {} receive() external payable {} }
{ "optimizer": { "enabled": true, "runs": 1337 }, "outputSelection": { "*": { "*": [ "evm.bytecode", "evm.deployedBytecode", "devdoc", "userdoc", "metadata", "abi" ] } }, "metadata": { "useLiteralContent": true }, "libraries": {} }
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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.