Overview
TokenID
1351
Total Transfers
-
Market
Onchain Market Cap
$0.00
Circulating Supply Market Cap
-
Other Info
Token Contract
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# | Exchange | Pair | Price | 24H Volume | % Volume |
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Minimal Proxy Contract for 0x76e9f19d76ae534cfb754afe9d9cc52395e5ffaf
Contract Name:
ShellERC721
Compiler Version
v0.8.9+commit.e5eed63a
Optimization Enabled:
Yes with 200 runs
Other Settings:
default evmVersion
Contract Source Code (Solidity Standard Json-Input format)
//SPDX-License-Identifier: MIT pragma solidity ^0.8.0; /* This NFT collection is powered by ███████╗██╗ ██╗███████╗██╗ ██╗ ██╔════╝██║ ██║██╔════╝██║ ██║ ███████╗███████║█████╗ ██║ ██║ ╚════██║██╔══██║██╔══╝ ██║ ██║ ███████║██║ ██║███████╗███████╗███████╗ ╚══════╝╚═╝ ╚═╝╚══════╝╚══════╝╚══════╝ An open product framework for NFTs Dreamt up & built at Playgrounds https://heyshell.xyz https://playgrounds.wtf */ import "@openzeppelin/contracts-upgradeable/token/ERC721/ERC721Upgradeable.sol"; import "./ShellFramework.sol"; contract ShellERC721 is ShellFramework, ERC721Upgradeable { // for ERC-721s, mint amount must be 1 error InvalidMintAmount(); function initialize( string calldata name_, string calldata symbol_, IEngine engine, address owner_ ) external initializer { // using the unchained variant since theres no real need to init the // erc165 and context stuff from openzep's 721 __ERC721_init_unchained(name_, symbol_); __ShellFramework_init(engine, owner_); } // --- // Standard ERC721 stuff // --- function name() public view override(IShellFramework, ERC721Upgradeable) returns (string memory) { return ERC721Upgradeable.name(); } function symbol() public view override(IShellFramework, ERC721Upgradeable) returns (string memory) { return ERC721Upgradeable.symbol(); } // --- // Views powered by engine // --- function tokenURI(uint256 tokenId) public view override returns (string memory) { return getTokenEngine(tokenId).getTokenURI(this, tokenId); } // --- // Framework functionality // --- function canSenderForkToken(address sender, uint256 tokenId) public view virtual override returns (bool) { // owner of a token can always fork return ownerOf(tokenId) == sender; } // --- // Engine functionality // --- function mint(MintEntry calldata entry) external returns (uint256) { if (msg.sender != address(getForkEngine(0))) { revert SenderNotEngine(); } if (entry.amount != 1) { revert InvalidMintAmount(); } uint256 tokenId = nextTokenId++; _mint(entry.to, tokenId); _writeMintData(tokenId, entry); return tokenId; } // --- // Introspection // --- function supportsInterface(bytes4 interfaceId) public view override(ShellFramework, ERC721Upgradeable) returns (bool) { return ShellFramework.supportsInterface(interfaceId) || ERC721Upgradeable.supportsInterface(interfaceId); } // --- // Wire up the openzep 721 hook to the engine // --- function _beforeTokenTransfer( address from, address to, uint256 tokenId ) internal override { getTokenEngine(tokenId).beforeTokenTransfer( msg.sender, from, to, tokenId, 1 ); } }
// 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 pragma solidity ^0.8.0; import "@openzeppelin/contracts-upgradeable/proxy/utils/Initializable.sol"; import "@openzeppelin/contracts/utils/introspection/ERC165Checker.sol"; import "./IShellFramework.sol"; // Abstract implementation of the shell framework interface -- can be used as a // base for all shell collections abstract contract ShellFramework is IShellFramework, Initializable { // fork data mapping(uint256 => Fork) private _forks; // token id -> fork id mapping(uint256 => uint256) private _tokenForks; // all stored strings mapping(bytes32 => string) private _stringStorage; // all stored ints mapping(bytes32 => uint256) private _intStorage; // token id serial number uint256 public nextTokenId; // fork id serial number uint256 public nextForkId; // ensure that the deployed implementation cannot be initialized after // deployment. Clones do not trigger the constructor but are manually // initted by ShellFactory // solhint-disable-next-line no-empty-blocks constructor() initializer {} // used to initialize the clone // solhint-disable-next-line func-name-mixedcase function __ShellFramework_init(IEngine engine, address owner_) internal onlyInitializing { nextTokenId = 1; nextForkId = 1; // not using createFork for initial fork _forks[0].engine = engine; _forks[0].owner = owner_; engine.afterEngineSet(0); emit ForkCreated(0, engine, owner_); } // --- // Fork functionality // --- function createFork( IEngine engine, address owner_, uint256[] calldata tokenIds ) external returns (uint256) { if ( !ERC165Checker.supportsInterface( address(engine), type(IEngine).interfaceId ) ) { revert InvalidEngine(); } uint256 forkId = nextForkId++; _forks[forkId].engine = engine; _forks[forkId].owner = owner_; emit ForkCreated(forkId, engine, owner_); for (uint256 i = 0; i < tokenIds.length; i++) { setTokenFork(tokenIds[i], forkId); } engine.afterEngineSet(forkId); return forkId; } // Set the fork of a specific token. Must be token owner function setTokenFork(uint256 tokenId, uint256 forkId) public override { if (!canSenderForkToken(msg.sender, tokenId)) { revert SenderCannotFork(); } _forkToken(tokenId, forkId); } function setTokenForks(uint256[] memory tokenIds, uint256 forkId) external override { for (uint256 i = 0; i < tokenIds.length; i++) { if (!canSenderForkToken(msg.sender, tokenIds[i])) { revert SenderCannotFork(); } _forkToken(tokenIds[i], forkId); } } function canSenderForkToken(address, uint256) public view virtual returns (bool) { // by default, do not allow forking return false; } function _forkToken(uint256 tokenId, uint256 forkId) internal { _tokenForks[tokenId] = forkId; emit TokenForkUpdated(tokenId, forkId); } function setForkEngine(uint256 forkId, IEngine engine) external { if (msg.sender != _forks[forkId].owner) { revert SenderNotForkOwner(); } if ( !ERC165Checker.supportsInterface( address(engine), type(IEngine).interfaceId ) ) { revert InvalidEngine(); } _forks[forkId].engine = engine; emit ForkEngineUpdated(forkId, engine); engine.afterEngineSet(forkId); } function setForkOwner(uint256 forkId, address owner_) external { if (msg.sender != _forks[forkId].owner) { revert SenderNotForkOwner(); } _forks[forkId].owner = owner_; emit ForkOwnerUpdated(forkId, owner_); } // --- // Fork views // --- function owner() external view returns (address) { return _forks[0].owner; // collection owner = fork 0 owner } function getFork(uint256 forkId) public view returns (Fork memory) { return _forks[forkId]; } function getForkEngine(uint256 forkId) public view returns (IEngine) { return _forks[forkId].engine; } function getForkOwner(uint256 forkId) public view returns (address) { return _forks[forkId].owner; } function getTokenForkId(uint256 tokenId) public view returns (uint256) { return _tokenForks[tokenId]; } function getTokenEngine(uint256 tokenId) public view returns (IEngine) { return _forks[_tokenForks[tokenId]].engine; } // --- // Standard mint functionality // --- function _writeMintData(uint256 tokenId, MintEntry calldata entry) internal { // write engine-provided immutable data for (uint256 i = 0; i < entry.options.stringData.length; i++) { _writeTokenString( StorageLocation.MINT_DATA, tokenId, entry.options.stringData[i].key, entry.options.stringData[i].value ); } for (uint256 i = 0; i < entry.options.intData.length; i++) { _writeTokenInt( StorageLocation.MINT_DATA, tokenId, entry.options.intData[i].key, entry.options.intData[i].value ); } // write framework immutable data if (entry.options.storeEngine) { _writeTokenInt( StorageLocation.FRAMEWORK, tokenId, "engine", uint256(uint160(address(getForkEngine(0)))) ); } if (entry.options.storeMintedTo) { _writeTokenInt( StorageLocation.FRAMEWORK, tokenId, "mintedTo", uint256(uint160(address(entry.to))) ); } if (entry.options.storeTimestamp) { _writeTokenInt( StorageLocation.FRAMEWORK, tokenId, "timestamp", // solhint-disable-next-line not-rely-on-time block.timestamp ); } if (entry.options.storeBlockNumber) { _writeTokenInt( StorageLocation.FRAMEWORK, tokenId, "blockNumber", block.number ); } } // --- // Storage write controller (for engine) // --- function writeForkString( StorageLocation location, uint256 forkId, string calldata key, string calldata value ) external { _validateForkWrite(location, forkId); _writeForkString(location, forkId, key, value); } function writeForkInt( StorageLocation location, uint256 forkId, string calldata key, uint256 value ) external { _validateForkWrite(location, forkId); _writeForkInt(location, forkId, key, value); } function writeTokenString( StorageLocation location, uint256 tokenId, string calldata key, string calldata value ) external { _validateTokenWrite(location, tokenId); _writeTokenString(location, tokenId, key, value); } function writeTokenInt( StorageLocation location, uint256 tokenId, string calldata key, uint256 value ) external { _validateTokenWrite(location, tokenId); _writeTokenInt(location, tokenId, key, value); } function _validateForkWrite(StorageLocation location, uint256 forkId) private view { if (location == StorageLocation.ENGINE) { if (msg.sender != address(getForkEngine(forkId))) { revert SenderNotEngine(); } return; // made it } revert WriteNotAllowed(); } function _validateTokenWrite(StorageLocation location, uint256 tokenId) private view { if (location == StorageLocation.ENGINE) { if (msg.sender != address(getTokenEngine(tokenId))) { revert SenderNotEngine(); } return; // made it } revert WriteNotAllowed(); } // --- // Storage write implementation // --- function _writeForkString( StorageLocation location, uint256 forkId, string memory key, string memory value ) private { bytes32 storageKey = keccak256( abi.encodePacked("fork", location, forkId, key) ); _stringStorage[storageKey] = value; emit ForkStringUpdated(location, forkId, key, value); } function _writeForkInt( StorageLocation location, uint256 forkId, string memory key, uint256 value ) private { bytes32 storageKey = keccak256( abi.encodePacked("fork", location, forkId, key) ); _intStorage[storageKey] = value; emit ForkIntUpdated(location, forkId, key, value); } function _writeTokenString( StorageLocation location, uint256 tokenId, string memory key, string memory value ) private { bytes32 storageKey = keccak256( abi.encodePacked("token", location, tokenId, key) ); _stringStorage[storageKey] = value; emit TokenStringUpdated(location, tokenId, key, value); } function _writeTokenInt( StorageLocation location, uint256 tokenId, string memory key, uint256 value ) private { bytes32 storageKey = keccak256( abi.encodePacked("token", location, tokenId, key) ); _intStorage[storageKey] = value; emit TokenIntUpdated(location, tokenId, key, value); } // --- // Storage views // --- function readForkString( StorageLocation location, uint256 forkId, string calldata key ) external view returns (string memory) { bytes32 storageKey = keccak256( abi.encodePacked("fork", location, forkId, key) ); return _stringStorage[storageKey]; } function readForkInt( StorageLocation location, uint256 forkId, string calldata key ) external view returns (uint256) { bytes32 storageKey = keccak256( abi.encodePacked("fork", location, forkId, key) ); return _intStorage[storageKey]; } function readTokenString( StorageLocation location, uint256 tokenId, string calldata key ) external view returns (string memory) { bytes32 storageKey = keccak256( abi.encodePacked("token", location, tokenId, key) ); return _stringStorage[storageKey]; } function readTokenInt( StorageLocation location, uint256 tokenId, string calldata key ) external view returns (uint256) { bytes32 storageKey = keccak256( abi.encodePacked("token", location, tokenId, key) ); return _intStorage[storageKey]; } // --- // Views powered by current engine // --- function royaltyInfo(uint256 tokenId, uint256 salePrice) external view returns (address receiver, uint256 royaltyAmount) { return getTokenEngine(tokenId).getRoyaltyInfo(this, tokenId, salePrice); } // --- // introspection // --- function supportsInterface(bytes4 interfaceId) public view virtual returns (bool) { return interfaceId == type(IShellFramework).interfaceId || interfaceId == type(IERC2981).interfaceId || interfaceId == type(IERC165).interfaceId; } }
// 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/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/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 (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/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/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 (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 (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/ERC165Checker.sol) pragma solidity ^0.8.0; import "./IERC165.sol"; /** * @dev Library used to query support of an interface declared via {IERC165}. * * Note that these functions return the actual result of the query: they do not * `revert` if an interface is not supported. It is up to the caller to decide * what to do in these cases. */ library ERC165Checker { // As per the EIP-165 spec, no interface should ever match 0xffffffff bytes4 private constant _INTERFACE_ID_INVALID = 0xffffffff; /** * @dev Returns true if `account` supports the {IERC165} interface, */ function supportsERC165(address account) internal view returns (bool) { // Any contract that implements ERC165 must explicitly indicate support of // InterfaceId_ERC165 and explicitly indicate non-support of InterfaceId_Invalid return _supportsERC165Interface(account, type(IERC165).interfaceId) && !_supportsERC165Interface(account, _INTERFACE_ID_INVALID); } /** * @dev Returns true if `account` supports the interface defined by * `interfaceId`. Support for {IERC165} itself is queried automatically. * * See {IERC165-supportsInterface}. */ function supportsInterface(address account, bytes4 interfaceId) internal view returns (bool) { // query support of both ERC165 as per the spec and support of _interfaceId return supportsERC165(account) && _supportsERC165Interface(account, interfaceId); } /** * @dev Returns a boolean array where each value corresponds to the * interfaces passed in and whether they're supported or not. This allows * you to batch check interfaces for a contract where your expectation * is that some interfaces may not be supported. * * See {IERC165-supportsInterface}. * * _Available since v3.4._ */ function getSupportedInterfaces(address account, bytes4[] memory interfaceIds) internal view returns (bool[] memory) { // an array of booleans corresponding to interfaceIds and whether they're supported or not bool[] memory interfaceIdsSupported = new bool[](interfaceIds.length); // query support of ERC165 itself if (supportsERC165(account)) { // query support of each interface in interfaceIds for (uint256 i = 0; i < interfaceIds.length; i++) { interfaceIdsSupported[i] = _supportsERC165Interface(account, interfaceIds[i]); } } return interfaceIdsSupported; } /** * @dev Returns true if `account` supports all the interfaces defined in * `interfaceIds`. Support for {IERC165} itself is queried automatically. * * Batch-querying can lead to gas savings by skipping repeated checks for * {IERC165} support. * * See {IERC165-supportsInterface}. */ function supportsAllInterfaces(address account, bytes4[] memory interfaceIds) internal view returns (bool) { // query support of ERC165 itself if (!supportsERC165(account)) { return false; } // query support of each interface in _interfaceIds for (uint256 i = 0; i < interfaceIds.length; i++) { if (!_supportsERC165Interface(account, interfaceIds[i])) { return false; } } // all interfaces supported return true; } /** * @notice Query if a contract implements an interface, does not check ERC165 support * @param account The address of the contract to query for support of an interface * @param interfaceId The interface identifier, as specified in ERC-165 * @return true if the contract at account indicates support of the interface with * identifier interfaceId, false otherwise * @dev Assumes that account contains a contract that supports ERC165, otherwise * the behavior of this method is undefined. This precondition can be checked * with {supportsERC165}. * Interface identification is specified in ERC-165. */ function _supportsERC165Interface(address account, bytes4 interfaceId) private view returns (bool) { bytes memory encodedParams = abi.encodeWithSelector(IERC165.supportsInterface.selector, interfaceId); (bool success, bytes memory result) = account.staticcall{gas: 30000}(encodedParams); if (result.length < 32) return false; return success && abi.decode(result, (bool)); } }
//SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import "@openzeppelin/contracts/interfaces/IERC165.sol"; import "@openzeppelin/contracts/interfaces/IERC2981.sol"; import "./libraries/IOwnable.sol"; import "./IEngine.sol"; // storage flag enum StorageLocation { INVALID, // set by the engine at any time, mutable ENGINE, // set by the engine during minting, immutable MINT_DATA, // set by the framework during minting or collection creation, immutable FRAMEWORK } // string key / value struct StringStorage { string key; string value; } // int key / value struct IntStorage { string key; uint256 value; } // data provided when minting a new token struct MintEntry { address to; uint256 amount; MintOptions options; } // Data provided by engine when minting a new token struct MintOptions { bool storeEngine; bool storeMintedTo; bool storeTimestamp; bool storeBlockNumber; StringStorage[] stringData; IntStorage[] intData; } // Information about a fork struct Fork { IEngine engine; address owner; } // Interface for every collection launched by shell. // Concrete implementations must return true on ERC165 checks for this interface // (as well as erc165 / 2981) // interfaceId = TBD interface IShellFramework is IERC165, IERC2981 { // --- // Framework errors // --- // an engine was provided that did no pass the expected erc165 checks error InvalidEngine(); // a write was attempted that is not allowed error WriteNotAllowed(); // an operation was attempted but msg.sender was not the expected engine error SenderNotEngine(); // an operation was attempted but msg.sender was not the fork owner error SenderNotForkOwner(); // a token fork was attempted by an invalid msg.sender error SenderCannotFork(); // --- // Framework events // --- // a fork was created event ForkCreated(uint256 forkId, IEngine engine, address owner); // a fork had a new engine installed event ForkEngineUpdated(uint256 forkId, IEngine engine); // a fork had a new owner set event ForkOwnerUpdated(uint256 forkId, address owner); // a token has been set to a new fork event TokenForkUpdated(uint256 tokenId, uint256 forkId); // --- // Storage events // --- // A fork string was stored event ForkStringUpdated( StorageLocation location, uint256 forkId, string key, string value ); // A fork int was stored event ForkIntUpdated( StorageLocation location, uint256 forkId, string key, uint256 value ); // A token string was stored event TokenStringUpdated( StorageLocation location, uint256 tokenId, string key, string value ); // A token int was stored event TokenIntUpdated( StorageLocation location, uint256 tokenId, string key, uint256 value ); // --- // Collection base // --- // called immediately after cloning function initialize( string calldata name, string calldata symbol, IEngine engine, address owner ) external; // --- // General collection info / metadata // --- // collection owner (fork 0 owner) function owner() external view returns (address); // collection name function name() external view returns (string memory); // collection name function symbol() external view returns (string memory); // next token id serial number function nextTokenId() external view returns (uint256); // next fork id serial number function nextForkId() external view returns (uint256); // --- // Fork functionality // --- // Create a new fork with a specific engine, fork all the tokenIds to the // new engine, and return the fork ID function createFork( IEngine engine, address owner, uint256[] calldata tokenIds ) external returns (uint256); // Set the engine for a specific fork. Must be fork owner function setForkEngine(uint256 forkId, IEngine engine) external; // Set the fork owner. Must be fork owner function setForkOwner(uint256 forkId, address owner) external; // Set the fork of a specific token. Must be token owner function setTokenFork(uint256 tokenId, uint256 forkId) external; // Set the fork for several tokens. Must own all tokens function setTokenForks(uint256[] memory tokenIds, uint256 forkId) external; // --- // Fork views // --- // Get information about a fork function getFork(uint256 forkId) external view returns (Fork memory); // Get a fork's engine function getForkEngine(uint256 forkId) external view returns (IEngine); // Get a fork's owner function getForkOwner(uint256 forkId) external view returns (address); // Get a token's fork ID function getTokenForkId(uint256 tokenId) external view returns (uint256); // Get a token's engine. getFork(getTokenForkId(tokenId)).engine function getTokenEngine(uint256 tokenId) external view returns (IEngine); // Determine if a given msg.sender can fork a token function canSenderForkToken(address sender, uint256 tokenId) external view returns (bool); // --- // Engine functionality // --- // mint new tokens. Only callable by collection engine function mint(MintEntry calldata entry) external returns (uint256); // --- // Storage writes // --- // Write a string to collection storage. Only callable by collection engine function writeForkString( StorageLocation location, uint256 forkId, string calldata key, string calldata value ) external; // Write a string to collection storage. Only callable by collection engine function writeForkInt( StorageLocation location, uint256 forkId, string calldata key, uint256 value ) external; // Write a string to token storage. Only callable by token engine function writeTokenString( StorageLocation location, uint256 tokenId, string calldata key, string calldata value ) external; // Write a string to token storage. Only callable by token engine function writeTokenInt( StorageLocation location, uint256 tokenId, string calldata key, uint256 value ) external; // --- // Storage reads // --- // Read a string from collection storage function readForkString( StorageLocation location, uint256 forkId, string calldata key ) external view returns (string memory); // Read a uint256 from collection storage function readForkInt( StorageLocation location, uint256 forkId, string calldata key ) external view returns (uint256); // Read a string from token storage function readTokenString( StorageLocation location, uint256 tokenId, string calldata key ) external view returns (string memory); // Read a uint256 from token storage function readTokenInt( StorageLocation location, uint256 tokenId, string calldata key ) external view returns (uint256); }
// 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 IERC165 { /** * @dev Returns true if this contract implements the interface defined by * `interfaceId`. See the corresponding * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section] * to learn more about how these ids are created. * * This function call must use less than 30 000 gas. */ function supportsInterface(bytes4 interfaceId) external view returns (bool); }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (interfaces/IERC165.sol) pragma solidity ^0.8.0; import "../utils/introspection/IERC165.sol";
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (interfaces/IERC2981.sol) pragma solidity ^0.8.0; import "./IERC165.sol"; /** * @dev Interface for the NFT Royalty Standard */ interface IERC2981 is IERC165 { /** * @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); }
//SPDX-License-Identifier: MIT pragma solidity ^0.8.0; // (semi) standard ownable interface interface IOwnable { event OwnershipTransferred( address indexed previousOwner, address indexed newOwner ); function owner() external view returns (address); function renounceOwnership() external; function transferOwnership(address newOwner) external; }
//SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import "@openzeppelin/contracts/interfaces/IERC165.sol"; import "./IShellFramework.sol"; // Required interface for framework engines // interfaceId = 0x0b1d171c interface IEngine is IERC165 { // Get the name for this engine function name() external pure returns (string memory); // Called by the framework to resolve a response for tokenURI method function getTokenURI(IShellFramework collection, uint256 tokenId) external view returns (string memory); // Called by the framework to resolve a response for royaltyInfo method function getRoyaltyInfo( IShellFramework collection, uint256 tokenId, uint256 salePrice ) external view returns (address receiver, uint256 royaltyAmount); // Called by the framework during a transfer, including mints (from=0) and // burns (to=0). Cannot break transfer even in the case of reverting, as the // collection will wrap the downstream call in a try/catch // collection = msg.sender function beforeTokenTransfer( address operator, address from, address to, uint256 tokenId, uint256 amount ) external; // Called by the framework whenever an engine is set on a fork, including // the collection (fork id = 0). Can be used by engine developers to prevent // an engine from being installed in a collection or non-canonical fork if // desired // collection = msg.sender function afterEngineSet(uint256 forkId) external; }
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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.