Feature Tip: Add private address tag to any address under My Name Tag !
ERC-721
Overview
Max Total Supply
18 TZDUCKS
Holders
18
Market
Volume (24H)
N/A
Min Price (24H)
N/A
Max Price (24H)
N/A
Other Info
Token Contract
Balance
1 TZDUCKSLoading...
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# | Exchange | Pair | Price | 24H Volume | % Volume |
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Contract Name:
TheAmazingTozziDuckMachine
Compiler Version
v0.8.9+commit.e5eed63a
Optimization Enabled:
Yes with 1000 runs
Other Settings:
default evmVersion
Contract Source Code (Solidity Standard Json-Input format)
// SPDX-License-Identifier: GPL-3.0 pragma solidity 0.8.9; import "./interfaces/ITheAmazingTozziDuckMachine.sol"; import "@openzeppelin/contracts/access/Ownable.sol"; import "@openzeppelin/contracts/token/ERC721/extensions/ERC721Enumerable.sol"; import "@openzeppelin/contracts/token/ERC721/extensions/ERC721Burnable.sol"; import "@openzeppelin/contracts/utils/Strings.sol"; import "@openzeppelin/contracts/utils/cryptography/MerkleProof.sol"; import "@rari-capital/solmate/src/utils/SSTORE2.sol"; import "@rari-capital/solmate/src/utils/SafeTransferLib.sol"; import {Base64} from "./lib/base64.sol"; /// @title Tozzi Ducks /// @author (ediv, exp.table) === CHAIN/SAW /* * ;@######@b,,,,,, ,,,, * .;##b 8@ #N,,{@#### N, * ,###b 8@ #Q;;;;;;;;, * ;###b 88#########Qssp * !@#b j@###############N 88##@@p * !@#b ;@################### #N ?8@@Q * "@@###N @@ ###################### #N ?8@@Q * '7@# ##b''''''''''''''''''7@### #N @@ b * ^^3 ###@# @####### "@#####S @@ b * .@#^ '@# '@###Q,,,, .,@##b * !@ ,####, ,######, '@### #Qpppppp@@#b * '@#p;## '@# @@b '@# @ # b'@#### ### b * '@#~ '@ @ ~ ,s@ 7bN, '@###Q, * ;@@ ~ ,s@ @ ~ ,s@## @ b 8@####Qp * ;## # ~ '@## @ ~'@#### ;sssssso @ b %@@# b * !@#b'8@@Q '@##### ~'@########888888@@# b "" * @########### ####@@ ~ '8 ####T^j@###N^7@@ b * @##""""""""""""""@@### ######"^ '"""@@#N'"@@#p * .@##^ ;########Q,,,,,j""""""""^ ;###@@#N@ b * '@ Q@##b^jQQQQ@# #Q,,,,,,,,,,,,@@#b^ jQ,@@#b * "@#QQp@### # Q@ ##Q$@# ### b ,@####b * '@###b '@ #Q@###QSG9^ .$@ #b.s###b * '@#Q## #N l@@## Q##b` * '@#b@ Q .l@@###@##b * %8@##@@######@@##b * "@@##8888@@## b * ""^!@# '%@ b * @#b @###p * ,@### j@# #p * .@##99@## @##99@##p * ;@ #GG$$@#######QpG8@##Q,,,, * .{@ #GGGG@# #Qp9Q@ ##GG9Q######WN,,, * ,s#888@QQGG@@##Wb788@QQ@@@ # 7@# Q, * * ________________________________ _____________ _______________ _________ * ___ __/_ __ \__ /__ /___ _/ ___ __ \_ / / /_ ____/__ //_/_ ___/ * __ / _ / / /_ /__ / __ / __ / / / / / /_ / __ ,< _____ \ * _ / / /_/ /_ /__ /___/ / _ /_/ // /_/ / / /___ _ /| | ____/ / * /_/ \____/ /____/____/___/ /_____/ \____/ \____/ /_/ |_| /____/ * * JIM TOZZI x CHAIN/SAW */ contract TheAmazingTozziDuckMachine is ERC721Burnable, ERC721Enumerable, Ownable, ITheAmazingTozziDuckMachine { using Strings for uint256; uint256 private constant TOZZI_DUCKS = 200; uint256 public constant OWNERSHIP_TOKEN_ID = 420; uint256 public constant probationPeriod = 1 weeks; bytes32 private constant MERKLE_ROOT = 0x76cf55ec8f156f88221bd1f5b7840a0e6427cafd0518667edd4ca7e530b535f3; uint256 private _nextCustomDuckTokenId; uint256 private _numCustomDucks; string private _ownershipTokenURI; MachineConfig public machineConfig; mapping(uint256 => address) public duckCreators; mapping(uint256 => bytes32) public artists; mapping(uint256 => bytes32) public duckTitles; mapping(uint256 => bool) public probationEnded; mapping(address => DuckAllowance) public duckAllowances; mapping(uint256 => DuckProfile) public duckProfiles; mapping(uint256 => address) public duckImageData; mapping(bytes32 => bool) public duckExists; mapping(uint256 => uint256) public customDuckHatchedTimes; modifier onlyMachineOwner() { if (!_isApprovedOrOwner(_msgSender(), OWNERSHIP_TOKEN_ID)) revert Unauthorized(); _; } modifier onlyExtantDuck(uint256 tokenId) { require(_exists(tokenId), "ERC721: owner query for nonexistent token"); _; } constructor( MachineConfig memory _machineConfig, string memory ownershipTokenURI ) ERC721("Tozzi Ducks", "TZDUCKS") { machineConfig = _machineConfig; _ownershipTokenURI = ownershipTokenURI; _safeMint(_msgSender(), OWNERSHIP_TOKEN_ID); } /** * @notice Configure the machine to manage the growth of the duck population responsibly. */ function setMachineConfig(MachineConfig calldata _machineConfig) external override onlyMachineOwner { machineConfig = _machineConfig; require(_machineConfig.maxCustomDucks >= _numCustomDucks); emit MachineConfigUpdated( _machineOwner(), _machineConfig.tozziDuckPrice, _machineConfig.customDuckPrice, _machineConfig.maxCustomDucks, _machineConfig.tozziDuckMintStatus, _machineConfig.customDuckMintStatus ); } /** * @notice Adjust the media associated with the token representing ownership of the machine. */ function setOwnershipTokenURI( string calldata ownershipTokenUri ) external override onlyMachineOwner { _ownershipTokenURI = ownershipTokenUri; } /** * @notice Share the latest news with the flock. * @dev Emits an event to be picked up and displayed by front-ends. */ function setMOTD(string calldata motd) external override onlyMachineOwner { emit MOTDSet(_msgSender(), motd); } /** * @notice Manage the duck allowance for an individual account. A duck allowance specifies how many of each type of duck * (Tozzi and Custom) a given user is able to mint. A user's duck allowances will deplete with each mint. Note: Duck allowances * are only taken into account when mint status for a particular duck type is set to MintStatus.Allow. */ function setDuckAllowance( address who, DuckAllowance calldata allowance ) external override onlyMachineOwner { duckAllowances[who] = allowance; } /** * @notice Set duck allowances for multiple accounts at once. Useful for whitelisting groups of accounts. Obviously, * this can get expensive so please use responsibly. */ function setDuckAllowances( address[] calldata who, DuckAllowance calldata allowance ) external override onlyMachineOwner { for (uint i = 0; i < who.length; i++) { duckAllowances[who[i]] = allowance; } } /** * @notice Immediately end probationary period for a custom duck. For use-cases where the duck looks so fine * you just can't wait a week to make them official. */ function endProbation(uint256 tokenId) external override onlyExtantDuck(tokenId) onlyMachineOwner { if (!_isCustomDuck(tokenId)) revert InvalidDuckId(); if (!_isOnProbation(tokenId)) revert ProbationEnded(); probationEnded[tokenId] = true; } /** * @notice Burn a freshly minted custom duck because you hate it's face. Custom ducks that are less than * 1 WEEK old are subject to the destructive whims of the machine's owner. */ function burnRenegadeDuck( uint256 tokenId, string calldata reason ) external override onlyExtantDuck(tokenId) onlyMachineOwner { if (!_isCustomDuck(tokenId)) revert InvalidDuckId(); if (!_isOnProbation(tokenId)) revert ProbationEnded(); address owner = ownerOf(tokenId); string memory webp = string(SSTORE2.read(duckImageData[tokenId])); _burn(tokenId); _numCustomDucks -= 1; emit CustomDuckBurned(tokenId, owner, _machineOwner(), webp, reason); } /** * @notice Grant a special title to a deserving duck. */ function setDuckTitle( uint256 tokenId, bytes32 title ) external override onlyExtantDuck(tokenId) onlyMachineOwner { duckTitles[tokenId] = title; emit DuckTitleGranted(tokenId, title, _machineOwner()); } /** * @notice Mint a custom duck directly to specified recipient bypassing minting fees. The resulting duck will have * it's 'Creator' attribute set to the supplied artist parameter. */ function ownerMint( address to, string calldata webp ) external override onlyMachineOwner { if (_numCustomDucks >= machineConfig.maxCustomDucks) revert CustomDuckLimitReached(); if (_nextCustomDuckTokenId + TOZZI_DUCKS == OWNERSHIP_TOKEN_ID) _nextCustomDuckTokenId += 1; bytes32 webpHash = keccak256(abi.encodePacked(webp)); if (duckExists[webpHash]) revert DuckAlreadyExists(); duckExists[webpHash] = true; uint256 tokenId = TOZZI_DUCKS + (_nextCustomDuckTokenId++); address pointer = SSTORE2.write(bytes(webp)); duckImageData[tokenId] = pointer; _safeMint(to, tokenId); customDuckHatchedTimes[tokenId] = block.timestamp; _numCustomDucks += 1; emit DuckMinted( tokenId, webpHash, _msgSender(), to, DuckType.Custom, machineConfig.customDuckPrice ); } /** * @notice Shout out the artist who created a custom duck. */ function setArtistName( uint256 tokenId, bytes32 name ) external override onlyExtantDuck(tokenId) onlyMachineOwner { if (!_isCustomDuck(tokenId)) revert InvalidDuckId(); artists[tokenId] = name; } /** * @notice After all ... Why shouldn't you take profits? */ function withdraw(address recipient, uint256 amount) external override onlyMachineOwner { if (amount > address(this).balance) revert InsufficientFunds(); if (amount == 0) revert AmountMustBeNonZero(); SafeTransferLib.safeTransferETH(recipient, amount); } /** * @notice Update your duck's profile by providing a custom name, status, and description. * @dev Customized duck profiles are used within tokenURI() when constructing a duck's metadata. */ function setDuckProfile( uint256 tokenId, bytes32 name, bytes32 status, string calldata description ) onlyExtantDuck(tokenId) external override { if (!_isApprovedOrOwner(_msgSender(), tokenId)) revert Unauthorized(); duckProfiles[tokenId] = DuckProfile(name, status, description); emit DuckProfileUpdated(tokenId, name, status, description); } /** * @notice Mint one of 200 official Tozzi Ducks created by Jim Tozzi. Image storage costs paid by minter. * @dev User supplies webp data to be stored on chain. The provided proof is used verify that provided * duck image data is legit. */ function mintTozziDuck( address to, uint256 duckId, string calldata webp, bytes32[] calldata merkleProof ) external override payable { if (machineConfig.tozziDuckMintStatus == MintStatus.Disabled) revert MintingDisabled(); if (msg.value != machineConfig.tozziDuckPrice) revert IncorrectDuckPrice(); if (machineConfig.tozziDuckMintStatus == MintStatus.Allow) { if (duckAllowances[_msgSender()].tozziDuckAllowance <= 0) revert InsufficientDuckAllowance(); duckAllowances[_msgSender()].tozziDuckAllowance--; } bytes32 webpHash = keccak256(abi.encodePacked(webp)); bytes32 node = keccak256(abi.encodePacked(duckId, webp)); if (!MerkleProof.verify(merkleProof, MERKLE_ROOT, node)) revert InvalidProof(); address pointer = SSTORE2.write(bytes(webp)); duckImageData[duckId] = pointer; _safeMint(to, duckId); emit DuckMinted( duckId, webpHash, _msgSender(), to, DuckType.Tozzi, machineConfig.tozziDuckPrice ); } /** * @notice Mint your very own custom duck. Minter pays fees associated with on-chain storage of webp image data. Newly minted * custom ducks are born into a 1 WEEK probation period. While under probation, custom ducks can be destroyed by the machine's * current owner. */ function mintCustomDuck(address to, string calldata webp) external override payable { if (machineConfig.customDuckMintStatus == MintStatus.Disabled) revert MintingDisabled(); if (_numCustomDucks >= machineConfig.maxCustomDucks) revert CustomDuckLimitReached(); if (msg.value != machineConfig.customDuckPrice) revert IncorrectDuckPrice(); if (machineConfig.customDuckMintStatus == MintStatus.Allow) { if (duckAllowances[_msgSender()].customDuckAllowance <= 0) revert InsufficientDuckAllowance(); duckAllowances[_msgSender()].customDuckAllowance--; } if (_nextCustomDuckTokenId + TOZZI_DUCKS == OWNERSHIP_TOKEN_ID) _nextCustomDuckTokenId += 1; bytes32 webpHash = keccak256(abi.encodePacked(webp)); if (duckExists[webpHash]) revert DuckAlreadyExists(); duckExists[webpHash] = true; uint256 tokenId = TOZZI_DUCKS + (_nextCustomDuckTokenId++); address pointer = SSTORE2.write(bytes(webp)); duckImageData[tokenId] = pointer; _safeMint(to, tokenId); duckCreators[tokenId] = _msgSender(); customDuckHatchedTimes[tokenId] = block.timestamp; _numCustomDucks += 1; emit DuckMinted( tokenId, webpHash, _msgSender(), to, DuckType.Custom, machineConfig.customDuckPrice ); } function tokenURI(uint256 tokenId) public view override onlyExtantDuck(tokenId) returns (string memory) { if (tokenId == OWNERSHIP_TOKEN_ID) return _ownershipTokenURI; DuckProfile memory profile = duckProfiles[tokenId]; string memory name = _defaultDuckName(tokenId); string memory description = name; if (!_isEmptyBytes32(profile.name)) name = _bytes32ToString(profile.name); if (bytes(profile.description).length > 0) description = profile.description; string memory image = string(abi.encodePacked("data:image/webp;base64,", string(SSTORE2.read(duckImageData[tokenId])))); return string(abi.encodePacked( "data:application/json;base64,", Base64.encode(abi.encodePacked( '{', '"name":"', name, '",', '"description":"', description, '",', '"image": "', image, '",', '"attributes":', _generateMetadataAttributes(tokenId, profile), '}' )) )); } function _getDuckCreator(uint256 tokenId) internal view returns (string memory) { if (tokenId < TOZZI_DUCKS) return "Jim Tozzi"; bytes32 artist = artists[tokenId]; if (!_isEmptyBytes32(artist)) { return string(abi.encodePacked(_bytes32ToString(artist))); } return string(abi.encodePacked(_addressToString(duckCreators[tokenId]))); } function _generateMetadataAttributes( uint256 tokenId, DuckProfile memory profile ) internal view returns (string memory attributes) { string memory duckType = _isTozziDuck(tokenId) ? "Tozzi" : "Custom"; string memory creator = _getDuckCreator(tokenId); bytes memory _attributes = abi.encodePacked( '{', '"trait_type": "Duck Type",', '"value":', '"', duckType, '"', '},' '{', '"trait_type": "Creator",', '"value":', '"', creator, '"', '}' ); if (_isOnProbation(tokenId)) { _attributes = abi.encodePacked( _attributes, ',', '{', '"trait_type": "Status",', '"value": "Probation"', '}' ); } else if (!_isEmptyBytes32(profile.status)) { _attributes = abi.encodePacked( _attributes, ',', '{', '"trait_type": "Status",', '"value":', '"', _bytes32ToString(profile.status), '"', '}' ); } bytes32 title = duckTitles[tokenId]; if (!_isEmptyBytes32(title)) { _attributes = abi.encodePacked( _attributes, ',', '{', '"trait_type": "Title",', '"value":', '"', _bytes32ToString(title), '"', '}' ); } return string(abi.encodePacked('[', _attributes, ']')); } function _addressToString(address _address) internal pure returns (string memory) { return Strings.toHexString(uint256(uint160(_address)), 20); } function _machineOwner() internal view returns (address machineOwner) { return ownerOf(OWNERSHIP_TOKEN_ID); } function _isTozziDuck(uint256 tokenId) internal pure returns (bool) { return tokenId < TOZZI_DUCKS; } function _isCustomDuck(uint256 tokenId) internal pure returns (bool) { return tokenId >= TOZZI_DUCKS && tokenId != OWNERSHIP_TOKEN_ID; } function _defaultDuckName(uint256 tokenId) internal pure returns (string memory) { return string(abi.encodePacked("Tozzi Duck ", tokenId.toString())); } function _isEmptyBytes32(bytes32 _bytes32) internal pure returns (bool) { bytes32 empty; return _bytes32 == empty; } function _isOnProbation(uint256 tokenId) internal view returns (bool) { if (!_isCustomDuck(tokenId)) return false; if (probationEnded[tokenId]) return false; return block.timestamp <= customDuckHatchedTimes[tokenId] + probationPeriod; } function _bytes32ToString(bytes32 _bytes32) internal pure returns (string memory) { uint8 i = 0; while(i < 32 && _bytes32[i] != 0) { i++; } bytes memory bytesArray = new bytes(i); for (i = 0; i < 32 && _bytes32[i] != 0; i++) { bytesArray[i] = _bytes32[i]; } return string(bytesArray); } /** * @dev See {IERC165-supportsInterface}. */ function supportsInterface(bytes4 interfaceId) public view virtual override(ERC721, ERC721Enumerable) returns (bool) { return interfaceId == type(ITheAmazingTozziDuckMachine).interfaceId || super.supportsInterface(interfaceId); } function _beforeTokenTransfer( address from, address to, uint256 tokenId ) internal virtual override(ERC721, ERC721Enumerable) { super._beforeTokenTransfer(from, to, tokenId); } }
// SPDX-License-Identifier: GPL-3.0 pragma solidity 0.8.9; interface ITheAmazingTozziDuckMachine { error AmountMustBeNonZero(); error ProbationEnded(); error CustomDuckLimitReached(); error DuckAlreadyExists(); error IncorrectDuckPrice(); error InsufficientDuckAllowance(); error InsufficientFunds(); error InvalidDuckId(); error InvalidProof(); error InvalidStatusId(); error MintingDisabled(); error Unauthorized(); enum DuckType { Tozzi, Custom } enum MintStatus { Enabled, Disabled, Allow } struct DuckAllowance { uint128 tozziDuckAllowance; uint128 customDuckAllowance; } struct DuckProfile { bytes32 name; bytes32 status; string description; } struct MachineConfig { uint256 tozziDuckPrice; uint256 customDuckPrice; uint256 maxCustomDucks; MintStatus tozziDuckMintStatus; MintStatus customDuckMintStatus; } event CustomDuckBurned( uint256 indexed duckId, address indexed duckOwner, address machineOwner, string webp, string reason ); event DuckMinted( uint256 indexed tokenId, bytes32 indexed webpHash, address indexed creator, address recipient, DuckType duckType, uint256 price ); event DuckProfileUpdated( uint256 indexed duckId, bytes32 indexed name, bytes32 indexed status, string description ); event DuckTitleGranted( uint256 indexed tokenId, bytes32 indexed title, address indexed owner ); event MachineConfigUpdated( address indexed who, uint256 tozziDuckPrice, uint256 customDuckPrice, uint256 maxCustomDucks, MintStatus tozziDuckMintStatus, MintStatus customDuckMintStatus ); event MOTDSet(address indexed owner, string message); function burnRenegadeDuck(uint256 tokenId, string calldata reason) external; function endProbation(uint256 tokenId) external; function mintCustomDuck(address to, string calldata webp) external payable; function mintTozziDuck(address to, uint256 duckId, string calldata webp, bytes32[] calldata merkleProof) external payable; function ownerMint(address to, string calldata webp) external; function setArtistName(uint256 tokenId, bytes32 name) external; function setDuckAllowance(address who, DuckAllowance calldata allowance) external; function setDuckAllowances(address[] calldata who, DuckAllowance calldata allowance) external; function setDuckProfile(uint256 tokenId, bytes32 name, bytes32 status, string calldata description) external; function setDuckTitle(uint256 tokenId, bytes32 title) external; function setMOTD(string calldata motd) external; function setMachineConfig(MachineConfig calldata _machineConfig) external; function setOwnershipTokenURI(string calldata ownershipTokenUri) external; function withdraw(address recipient, uint256 amount) external; }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (access/Ownable.sol) pragma solidity ^0.8.0; import "../utils/Context.sol"; /** * @dev Contract module which provides a basic access control mechanism, where * there is an account (an owner) that can be granted exclusive access to * specific functions. * * By default, the owner account will be the one that deploys the contract. This * can later be changed with {transferOwnership}. * * This module is used through inheritance. It will make available the modifier * `onlyOwner`, which can be applied to your functions to restrict their use to * the owner. */ abstract contract Ownable is Context { address private _owner; event OwnershipTransferred(address indexed previousOwner, address indexed newOwner); /** * @dev Initializes the contract setting the deployer as the initial owner. */ constructor() { _transferOwnership(_msgSender()); } /** * @dev Returns the address of the current owner. */ function owner() public view virtual returns (address) { return _owner; } /** * @dev Throws if called by any account other than the owner. */ modifier onlyOwner() { require(owner() == _msgSender(), "Ownable: caller is not the owner"); _; } /** * @dev Leaves the contract without owner. It will not be possible to call * `onlyOwner` functions anymore. Can only be called by the current owner. * * NOTE: Renouncing ownership will leave the contract without an owner, * thereby removing any functionality that is only available to the owner. */ function renounceOwnership() public virtual onlyOwner { _transferOwnership(address(0)); } /** * @dev Transfers ownership of the contract to a new account (`newOwner`). * Can only be called by the current owner. */ function transferOwnership(address newOwner) public virtual onlyOwner { require(newOwner != address(0), "Ownable: new owner is the zero address"); _transferOwnership(newOwner); } /** * @dev Transfers ownership of the contract to a new account (`newOwner`). * Internal function without access restriction. */ function _transferOwnership(address newOwner) internal virtual { address oldOwner = _owner; _owner = newOwner; emit OwnershipTransferred(oldOwner, newOwner); } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (token/ERC721/extensions/ERC721Enumerable.sol) pragma solidity ^0.8.0; import "../ERC721.sol"; import "./IERC721Enumerable.sol"; /** * @dev This implements an optional extension of {ERC721} defined in the EIP that adds * enumerability of all the token ids in the contract as well as all token ids owned by each * account. */ abstract contract ERC721Enumerable is ERC721, IERC721Enumerable { // Mapping from owner to list of owned token IDs mapping(address => mapping(uint256 => uint256)) private _ownedTokens; // Mapping from token ID to index of the owner tokens list mapping(uint256 => uint256) private _ownedTokensIndex; // Array with all token ids, used for enumeration uint256[] private _allTokens; // Mapping from token id to position in the allTokens array mapping(uint256 => uint256) private _allTokensIndex; /** * @dev See {IERC165-supportsInterface}. */ function supportsInterface(bytes4 interfaceId) public view virtual override(IERC165, ERC721) returns (bool) { return interfaceId == type(IERC721Enumerable).interfaceId || super.supportsInterface(interfaceId); } /** * @dev See {IERC721Enumerable-tokenOfOwnerByIndex}. */ function tokenOfOwnerByIndex(address owner, uint256 index) public view virtual override returns (uint256) { require(index < ERC721.balanceOf(owner), "ERC721Enumerable: owner index out of bounds"); return _ownedTokens[owner][index]; } /** * @dev See {IERC721Enumerable-totalSupply}. */ function totalSupply() public view virtual override returns (uint256) { return _allTokens.length; } /** * @dev See {IERC721Enumerable-tokenByIndex}. */ function tokenByIndex(uint256 index) public view virtual override returns (uint256) { require(index < ERC721Enumerable.totalSupply(), "ERC721Enumerable: global index out of bounds"); return _allTokens[index]; } /** * @dev Hook that is called before any token transfer. This includes minting * and burning. * * Calling conditions: * * - When `from` and `to` are both non-zero, ``from``'s `tokenId` will be * transferred to `to`. * - When `from` is zero, `tokenId` will be minted for `to`. * - When `to` is zero, ``from``'s `tokenId` will be burned. * - `from` cannot be the zero address. * - `to` cannot be the zero address. * * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks]. */ function _beforeTokenTransfer( address from, address to, uint256 tokenId ) internal virtual override { super._beforeTokenTransfer(from, to, tokenId); if (from == address(0)) { _addTokenToAllTokensEnumeration(tokenId); } else if (from != to) { _removeTokenFromOwnerEnumeration(from, tokenId); } if (to == address(0)) { _removeTokenFromAllTokensEnumeration(tokenId); } else if (to != from) { _addTokenToOwnerEnumeration(to, tokenId); } } /** * @dev Private function to add a token to this extension's ownership-tracking data structures. * @param to address representing the new owner of the given token ID * @param tokenId uint256 ID of the token to be added to the tokens list of the given address */ function _addTokenToOwnerEnumeration(address to, uint256 tokenId) private { uint256 length = ERC721.balanceOf(to); _ownedTokens[to][length] = tokenId; _ownedTokensIndex[tokenId] = length; } /** * @dev Private function to add a token to this extension's token tracking data structures. * @param tokenId uint256 ID of the token to be added to the tokens list */ function _addTokenToAllTokensEnumeration(uint256 tokenId) private { _allTokensIndex[tokenId] = _allTokens.length; _allTokens.push(tokenId); } /** * @dev Private function to remove a token from this extension's ownership-tracking data structures. Note that * while the token is not assigned a new owner, the `_ownedTokensIndex` mapping is _not_ updated: this allows for * gas optimizations e.g. when performing a transfer operation (avoiding double writes). * This has O(1) time complexity, but alters the order of the _ownedTokens array. * @param from address representing the previous owner of the given token ID * @param tokenId uint256 ID of the token to be removed from the tokens list of the given address */ function _removeTokenFromOwnerEnumeration(address from, uint256 tokenId) private { // To prevent a gap in from's tokens array, we store the last token in the index of the token to delete, and // then delete the last slot (swap and pop). uint256 lastTokenIndex = ERC721.balanceOf(from) - 1; uint256 tokenIndex = _ownedTokensIndex[tokenId]; // When the token to delete is the last token, the swap operation is unnecessary if (tokenIndex != lastTokenIndex) { uint256 lastTokenId = _ownedTokens[from][lastTokenIndex]; _ownedTokens[from][tokenIndex] = lastTokenId; // Move the last token to the slot of the to-delete token _ownedTokensIndex[lastTokenId] = tokenIndex; // Update the moved token's index } // This also deletes the contents at the last position of the array delete _ownedTokensIndex[tokenId]; delete _ownedTokens[from][lastTokenIndex]; } /** * @dev Private function to remove a token from this extension's token tracking data structures. * This has O(1) time complexity, but alters the order of the _allTokens array. * @param tokenId uint256 ID of the token to be removed from the tokens list */ function _removeTokenFromAllTokensEnumeration(uint256 tokenId) private { // To prevent a gap in the tokens array, we store the last token in the index of the token to delete, and // then delete the last slot (swap and pop). uint256 lastTokenIndex = _allTokens.length - 1; uint256 tokenIndex = _allTokensIndex[tokenId]; // When the token to delete is the last token, the swap operation is unnecessary. However, since this occurs so // rarely (when the last minted token is burnt) that we still do the swap here to avoid the gas cost of adding // an 'if' statement (like in _removeTokenFromOwnerEnumeration) uint256 lastTokenId = _allTokens[lastTokenIndex]; _allTokens[tokenIndex] = lastTokenId; // Move the last token to the slot of the to-delete token _allTokensIndex[lastTokenId] = tokenIndex; // Update the moved token's index // This also deletes the contents at the last position of the array delete _allTokensIndex[tokenId]; _allTokens.pop(); } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (token/ERC721/extensions/ERC721Burnable.sol) pragma solidity ^0.8.0; import "../ERC721.sol"; import "../../../utils/Context.sol"; /** * @title ERC721 Burnable Token * @dev ERC721 Token that can be irreversibly burned (destroyed). */ abstract contract ERC721Burnable is Context, ERC721 { /** * @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), "ERC721Burnable: caller is not owner nor approved"); _burn(tokenId); } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (utils/Strings.sol) pragma solidity ^0.8.0; /** * @dev String operations. */ library Strings { bytes16 private constant _HEX_SYMBOLS = "0123456789abcdef"; /** * @dev Converts a `uint256` to its ASCII `string` decimal representation. */ function toString(uint256 value) internal pure returns (string memory) { // Inspired by OraclizeAPI's implementation - MIT licence // https://github.com/oraclize/ethereum-api/blob/b42146b063c7d6ee1358846c198246239e9360e8/oraclizeAPI_0.4.25.sol if (value == 0) { return "0"; } uint256 temp = value; uint256 digits; while (temp != 0) { digits++; temp /= 10; } bytes memory buffer = new bytes(digits); while (value != 0) { digits -= 1; buffer[digits] = bytes1(uint8(48 + uint256(value % 10))); value /= 10; } return string(buffer); } /** * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation. */ function toHexString(uint256 value) internal pure returns (string memory) { if (value == 0) { return "0x00"; } uint256 temp = value; uint256 length = 0; while (temp != 0) { length++; temp >>= 8; } return toHexString(value, length); } /** * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length. */ function toHexString(uint256 value, uint256 length) internal pure returns (string memory) { bytes memory buffer = new bytes(2 * length + 2); buffer[0] = "0"; buffer[1] = "x"; for (uint256 i = 2 * length + 1; i > 1; --i) { buffer[i] = _HEX_SYMBOLS[value & 0xf]; value >>= 4; } require(value == 0, "Strings: hex length insufficient"); return string(buffer); } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.5.0) (utils/cryptography/MerkleProof.sol) pragma solidity ^0.8.0; /** * @dev These functions deal with verification of Merkle Trees proofs. * * The proofs can be generated using the JavaScript library * https://github.com/miguelmota/merkletreejs[merkletreejs]. * Note: the hashing algorithm should be keccak256 and pair sorting should be enabled. * * See `test/utils/cryptography/MerkleProof.test.js` for some examples. */ library MerkleProof { /** * @dev Returns true if a `leaf` can be proved to be a part of a Merkle tree * defined by `root`. For this, a `proof` must be provided, containing * sibling hashes on the branch from the leaf to the root of the tree. Each * pair of leaves and each pair of pre-images are assumed to be sorted. */ function verify( bytes32[] memory proof, bytes32 root, bytes32 leaf ) internal pure returns (bool) { return processProof(proof, leaf) == root; } /** * @dev Returns the rebuilt hash obtained by traversing a Merklee tree up * from `leaf` using `proof`. A `proof` is valid if and only if the rebuilt * hash matches the root of the tree. When processing the proof, the pairs * of leafs & pre-images are assumed to be sorted. * * _Available since v4.4._ */ function processProof(bytes32[] memory proof, bytes32 leaf) internal pure returns (bytes32) { bytes32 computedHash = leaf; for (uint256 i = 0; i < proof.length; i++) { bytes32 proofElement = proof[i]; if (computedHash <= proofElement) { // Hash(current computed hash + current element of the proof) computedHash = _efficientHash(computedHash, proofElement); } else { // Hash(current element of the proof + current computed hash) computedHash = _efficientHash(proofElement, computedHash); } } return computedHash; } function _efficientHash(bytes32 a, bytes32 b) private pure returns (bytes32 value) { assembly { mstore(0x00, a) mstore(0x20, b) value := keccak256(0x00, 0x40) } } }
// SPDX-License-Identifier: AGPL-3.0-only pragma solidity >=0.8.0; /// @notice Read and write to persistent storage at a fraction of the cost. /// @author Solmate (https://github.com/Rari-Capital/solmate/blob/main/src/utils/SSTORE2.sol) /// @author Modified from 0xSequence (https://github.com/0xSequence/sstore2/blob/master/contracts/SSTORE2.sol) library SSTORE2 { uint256 internal constant DATA_OFFSET = 1; // We skip the first byte as it's a STOP opcode to ensure the contract can't be called. /*/////////////////////////////////////////////////////////////// WRITE LOGIC //////////////////////////////////////////////////////////////*/ function write(bytes memory data) internal returns (address pointer) { // Prefix the bytecode with a STOP opcode to ensure it cannot be called. bytes memory runtimeCode = abi.encodePacked(hex"00", data); bytes memory creationCode = abi.encodePacked( //---------------------------------------------------------------------------------------------------------------// // Opcode | Opcode + Arguments | Description | Stack View // //---------------------------------------------------------------------------------------------------------------// // 0x60 | 0x600B | PUSH1 11 | codeOffset // // 0x59 | 0x59 | MSIZE | 0 codeOffset // // 0x81 | 0x81 | DUP2 | codeOffset 0 codeOffset // // 0x38 | 0x38 | CODESIZE | codeSize codeOffset 0 codeOffset // // 0x03 | 0x03 | SUB | (codeSize - codeOffset) 0 codeOffset // // 0x80 | 0x80 | DUP | (codeSize - codeOffset) (codeSize - codeOffset) 0 codeOffset // // 0x92 | 0x92 | SWAP3 | codeOffset (codeSize - codeOffset) 0 (codeSize - codeOffset) // // 0x59 | 0x59 | MSIZE | 0 codeOffset (codeSize - codeOffset) 0 (codeSize - codeOffset) // // 0x39 | 0x39 | CODECOPY | 0 (codeSize - codeOffset) // // 0xf3 | 0xf3 | RETURN | // //---------------------------------------------------------------------------------------------------------------// hex"60_0B_59_81_38_03_80_92_59_39_F3", // Returns all code in the contract except for the first 11 (0B in hex) bytes. runtimeCode // The bytecode we want the contract to have after deployment. Capped at 1 byte less than the code size limit. ); assembly { // Deploy a new contract with the generated creation code. // We start 32 bytes into the code to avoid copying the byte length. pointer := create(0, add(creationCode, 32), mload(creationCode)) } require(pointer != address(0), "DEPLOYMENT_FAILED"); } /*/////////////////////////////////////////////////////////////// READ LOGIC //////////////////////////////////////////////////////////////*/ function read(address pointer) internal view returns (bytes memory) { return readBytecode(pointer, DATA_OFFSET, pointer.code.length - DATA_OFFSET); } function read(address pointer, uint256 start) internal view returns (bytes memory) { start += DATA_OFFSET; return readBytecode(pointer, start, pointer.code.length - start); } function read( address pointer, uint256 start, uint256 end ) internal view returns (bytes memory) { start += DATA_OFFSET; end += DATA_OFFSET; require(pointer.code.length >= end, "OUT_OF_BOUNDS"); return readBytecode(pointer, start, end - start); } /*/////////////////////////////////////////////////////////////// INTERNAL HELPER LOGIC //////////////////////////////////////////////////////////////*/ function readBytecode( address pointer, uint256 start, uint256 size ) private view returns (bytes memory data) { assembly { // Get a pointer to some free memory. data := mload(0x40) // Update the free memory pointer to prevent overriding our data. // We use and(x, not(31)) as a cheaper equivalent to sub(x, mod(x, 32)). // Adding 31 to size and running the result through the logic above ensures // the memory pointer remains word-aligned, following the Solidity convention. mstore(0x40, add(data, and(add(add(size, 32), 31), not(31)))) // Store the size of the data in the first 32 byte chunk of free memory. mstore(data, size) // Copy the code into memory right after the 32 bytes we used to store the size. extcodecopy(pointer, add(data, 32), start, size) } } }
// SPDX-License-Identifier: AGPL-3.0-only pragma solidity >=0.8.0; import {ERC20} from "../tokens/ERC20.sol"; /// @notice Safe ETH and ERC20 transfer library that gracefully handles missing return values. /// @author Solmate (https://github.com/Rari-Capital/solmate/blob/main/src/utils/SafeTransferLib.sol) /// @author Modified from Gnosis (https://github.com/gnosis/gp-v2-contracts/blob/main/src/contracts/libraries/GPv2SafeERC20.sol) /// @dev Use with caution! Some functions in this library knowingly create dirty bits at the destination of the free memory pointer. library SafeTransferLib { /*/////////////////////////////////////////////////////////////// ETH OPERATIONS //////////////////////////////////////////////////////////////*/ function safeTransferETH(address to, uint256 amount) internal { bool callStatus; assembly { // Transfer the ETH and store if it succeeded or not. callStatus := call(gas(), to, amount, 0, 0, 0, 0) } require(callStatus, "ETH_TRANSFER_FAILED"); } /*/////////////////////////////////////////////////////////////// ERC20 OPERATIONS //////////////////////////////////////////////////////////////*/ function safeTransferFrom( ERC20 token, address from, address to, uint256 amount ) internal { bool callStatus; assembly { // Get a pointer to some free memory. let freeMemoryPointer := mload(0x40) // Write the abi-encoded calldata to memory piece by piece: mstore(freeMemoryPointer, 0x23b872dd00000000000000000000000000000000000000000000000000000000) // Begin with the function selector. mstore(add(freeMemoryPointer, 4), and(from, 0xffffffffffffffffffffffffffffffffffffffff)) // Mask and append the "from" argument. mstore(add(freeMemoryPointer, 36), and(to, 0xffffffffffffffffffffffffffffffffffffffff)) // Mask and append the "to" argument. mstore(add(freeMemoryPointer, 68), amount) // Finally append the "amount" argument. No mask as it's a full 32 byte value. // Call the token and store if it succeeded or not. // We use 100 because the calldata length is 4 + 32 * 3. callStatus := call(gas(), token, 0, freeMemoryPointer, 100, 0, 0) } require(didLastOptionalReturnCallSucceed(callStatus), "TRANSFER_FROM_FAILED"); } function safeTransfer( ERC20 token, address to, uint256 amount ) internal { bool callStatus; assembly { // Get a pointer to some free memory. let freeMemoryPointer := mload(0x40) // Write the abi-encoded calldata to memory piece by piece: mstore(freeMemoryPointer, 0xa9059cbb00000000000000000000000000000000000000000000000000000000) // Begin with the function selector. mstore(add(freeMemoryPointer, 4), and(to, 0xffffffffffffffffffffffffffffffffffffffff)) // Mask and append the "to" argument. mstore(add(freeMemoryPointer, 36), amount) // Finally append the "amount" argument. No mask as it's a full 32 byte value. // Call the token and store if it succeeded or not. // We use 68 because the calldata length is 4 + 32 * 2. callStatus := call(gas(), token, 0, freeMemoryPointer, 68, 0, 0) } require(didLastOptionalReturnCallSucceed(callStatus), "TRANSFER_FAILED"); } function safeApprove( ERC20 token, address to, uint256 amount ) internal { bool callStatus; assembly { // Get a pointer to some free memory. let freeMemoryPointer := mload(0x40) // Write the abi-encoded calldata to memory piece by piece: mstore(freeMemoryPointer, 0x095ea7b300000000000000000000000000000000000000000000000000000000) // Begin with the function selector. mstore(add(freeMemoryPointer, 4), and(to, 0xffffffffffffffffffffffffffffffffffffffff)) // Mask and append the "to" argument. mstore(add(freeMemoryPointer, 36), amount) // Finally append the "amount" argument. No mask as it's a full 32 byte value. // Call the token and store if it succeeded or not. // We use 68 because the calldata length is 4 + 32 * 2. callStatus := call(gas(), token, 0, freeMemoryPointer, 68, 0, 0) } require(didLastOptionalReturnCallSucceed(callStatus), "APPROVE_FAILED"); } /*/////////////////////////////////////////////////////////////// INTERNAL HELPER LOGIC //////////////////////////////////////////////////////////////*/ function didLastOptionalReturnCallSucceed(bool callStatus) private pure returns (bool success) { assembly { // Get how many bytes the call returned. let returnDataSize := returndatasize() // If the call reverted: if iszero(callStatus) { // Copy the revert message into memory. returndatacopy(0, 0, returnDataSize) // Revert with the same message. revert(0, returnDataSize) } switch returnDataSize case 32 { // Copy the return data into memory. returndatacopy(0, 0, returnDataSize) // Set success to whether it returned true. success := iszero(iszero(mload(0))) } case 0 { // There was no return data. success := 1 } default { // It returned some malformed input. success := 0 } } } }
// SPDX-License-Identifier: MIT pragma solidity >=0.6.0; /// @title Base64 /// @author Brecht Devos - <[email protected]> /// @notice Provides functions for encoding/decoding base64 library Base64 { string internal constant TABLE_ENCODE = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"; bytes internal constant TABLE_DECODE = hex"0000000000000000000000000000000000000000000000000000000000000000" hex"00000000000000000000003e0000003f3435363738393a3b3c3d000000000000" hex"00000102030405060708090a0b0c0d0e0f101112131415161718190000000000" hex"001a1b1c1d1e1f202122232425262728292a2b2c2d2e2f303132330000000000"; function encode(bytes memory data) internal pure returns (string memory) { if (data.length == 0) return ""; // load the table into memory string memory table = TABLE_ENCODE; // multiply by 4/3 rounded up uint256 encodedLen = 4 * ((data.length + 2) / 3); // add some extra buffer at the end required for the writing string memory result = new string(encodedLen + 32); assembly { // set the actual output length mstore(result, encodedLen) // prepare the lookup table let tablePtr := add(table, 1) // input ptr let dataPtr := data let endPtr := add(dataPtr, mload(data)) // result ptr, jump over length let resultPtr := add(result, 32) // run over the input, 3 bytes at a time for { } lt(dataPtr, endPtr) { } { // read 3 bytes dataPtr := add(dataPtr, 3) let input := mload(dataPtr) // write 4 characters mstore8( resultPtr, mload(add(tablePtr, and(shr(18, input), 0x3F))) ) resultPtr := add(resultPtr, 1) mstore8( resultPtr, mload(add(tablePtr, and(shr(12, input), 0x3F))) ) resultPtr := add(resultPtr, 1) mstore8( resultPtr, mload(add(tablePtr, and(shr(6, input), 0x3F))) ) resultPtr := add(resultPtr, 1) mstore8(resultPtr, mload(add(tablePtr, and(input, 0x3F)))) resultPtr := add(resultPtr, 1) } // padding with '=' switch mod(mload(data), 3) case 1 { mstore(sub(resultPtr, 2), shl(240, 0x3d3d)) } case 2 { mstore(sub(resultPtr, 1), shl(248, 0x3d)) } } return result; } function decode(string memory _data) internal pure returns (bytes memory) { bytes memory data = bytes(_data); if (data.length == 0) return new bytes(0); require(data.length % 4 == 0, "invalid base64 decoder input"); // load the table into memory bytes memory table = TABLE_DECODE; // every 4 characters represent 3 bytes uint256 decodedLen = (data.length / 4) * 3; // add some extra buffer at the end required for the writing bytes memory result = new bytes(decodedLen + 32); assembly { // padding with '=' let lastBytes := mload(add(data, mload(data))) if eq(and(lastBytes, 0xFF), 0x3d) { decodedLen := sub(decodedLen, 1) if eq(and(lastBytes, 0xFFFF), 0x3d3d) { decodedLen := sub(decodedLen, 1) } } // set the actual output length mstore(result, decodedLen) // prepare the lookup table let tablePtr := add(table, 1) // input ptr let dataPtr := data let endPtr := add(dataPtr, mload(data)) // result ptr, jump over length let resultPtr := add(result, 32) // run over the input, 4 characters at a time for { } lt(dataPtr, endPtr) { } { // read 4 characters dataPtr := add(dataPtr, 4) let input := mload(dataPtr) // write 3 bytes let output := add( add( shl( 18, and( mload(add(tablePtr, and(shr(24, input), 0xFF))), 0xFF ) ), shl( 12, and( mload(add(tablePtr, and(shr(16, input), 0xFF))), 0xFF ) ) ), add( shl( 6, and( mload(add(tablePtr, and(shr(8, input), 0xFF))), 0xFF ) ), and(mload(add(tablePtr, and(input, 0xFF))), 0xFF) ) ) mstore(resultPtr, shl(232, output)) resultPtr := add(resultPtr, 3) } } return result; } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (utils/Context.sol) pragma solidity ^0.8.0; /** * @dev Provides information about the current execution context, including the * sender of the transaction and its data. While these are generally available * via msg.sender and msg.data, they should not be accessed in such a direct * manner, since when dealing with meta-transactions the account sending and * paying for execution may not be the actual sender (as far as an application * is concerned). * * This contract is only required for intermediate, library-like contracts. */ abstract contract Context { function _msgSender() internal view virtual returns (address) { return msg.sender; } function _msgData() internal view virtual returns (bytes calldata) { return msg.data; } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.5.0) (token/ERC721/ERC721.sol) pragma solidity ^0.8.0; import "./IERC721.sol"; import "./IERC721Receiver.sol"; import "./extensions/IERC721Metadata.sol"; import "../../utils/Address.sol"; import "../../utils/Context.sol"; import "../../utils/Strings.sol"; import "../../utils/introspection/ERC165.sol"; /** * @dev Implementation of https://eips.ethereum.org/EIPS/eip-721[ERC721] Non-Fungible Token Standard, including * the Metadata extension, but not including the Enumerable extension, which is available separately as * {ERC721Enumerable}. */ contract ERC721 is Context, ERC165, IERC721, IERC721Metadata { using Address for address; using Strings for uint256; // Token name string private _name; // Token symbol string private _symbol; // Mapping from token ID to owner address mapping(uint256 => address) private _owners; // Mapping owner address to token count mapping(address => uint256) private _balances; // Mapping from token ID to approved address mapping(uint256 => address) private _tokenApprovals; // Mapping from owner to operator approvals mapping(address => mapping(address => bool)) private _operatorApprovals; /** * @dev Initializes the contract by setting a `name` and a `symbol` to the token collection. */ constructor(string memory name_, string memory symbol_) { _name = name_; _symbol = symbol_; } /** * @dev See {IERC165-supportsInterface}. */ function supportsInterface(bytes4 interfaceId) public view virtual override(ERC165, IERC165) returns (bool) { return interfaceId == type(IERC721).interfaceId || interfaceId == type(IERC721Metadata).interfaceId || super.supportsInterface(interfaceId); } /** * @dev See {IERC721-balanceOf}. */ function balanceOf(address owner) public view virtual override returns (uint256) { require(owner != address(0), "ERC721: balance query for the zero address"); return _balances[owner]; } /** * @dev See {IERC721-ownerOf}. */ function ownerOf(uint256 tokenId) public view virtual override returns (address) { address owner = _owners[tokenId]; require(owner != address(0), "ERC721: owner query for nonexistent token"); return owner; } /** * @dev See {IERC721Metadata-name}. */ function name() public view virtual override returns (string memory) { return _name; } /** * @dev See {IERC721Metadata-symbol}. */ function symbol() public view virtual override returns (string memory) { return _symbol; } /** * @dev See {IERC721Metadata-tokenURI}. */ function tokenURI(uint256 tokenId) public view virtual override returns (string memory) { require(_exists(tokenId), "ERC721Metadata: URI query for nonexistent token"); string memory baseURI = _baseURI(); return bytes(baseURI).length > 0 ? string(abi.encodePacked(baseURI, tokenId.toString())) : ""; } /** * @dev Base URI for computing {tokenURI}. If set, the resulting URI for each * token will be the concatenation of the `baseURI` and the `tokenId`. Empty * by default, can be overriden in child contracts. */ function _baseURI() internal view virtual returns (string memory) { return ""; } /** * @dev See {IERC721-approve}. */ function approve(address to, uint256 tokenId) public virtual override { address owner = ERC721.ownerOf(tokenId); require(to != owner, "ERC721: approval to current owner"); require( _msgSender() == owner || isApprovedForAll(owner, _msgSender()), "ERC721: approve caller is not owner nor approved for all" ); _approve(to, tokenId); } /** * @dev See {IERC721-getApproved}. */ function getApproved(uint256 tokenId) public view virtual override returns (address) { require(_exists(tokenId), "ERC721: approved query for nonexistent token"); return _tokenApprovals[tokenId]; } /** * @dev See {IERC721-setApprovalForAll}. */ function setApprovalForAll(address operator, bool approved) public virtual override { _setApprovalForAll(_msgSender(), operator, approved); } /** * @dev See {IERC721-isApprovedForAll}. */ function isApprovedForAll(address owner, address operator) public view virtual override returns (bool) { return _operatorApprovals[owner][operator]; } /** * @dev See {IERC721-transferFrom}. */ function transferFrom( address from, address to, uint256 tokenId ) public virtual override { //solhint-disable-next-line max-line-length require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: transfer caller is not owner nor approved"); _transfer(from, to, tokenId); } /** * @dev See {IERC721-safeTransferFrom}. */ function safeTransferFrom( address from, address to, uint256 tokenId ) public virtual override { safeTransferFrom(from, to, tokenId, ""); } /** * @dev See {IERC721-safeTransferFrom}. */ function safeTransferFrom( address from, address to, uint256 tokenId, bytes memory _data ) public virtual override { require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: transfer caller is not owner nor approved"); _safeTransfer(from, to, tokenId, _data); } /** * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients * are aware of the ERC721 protocol to prevent tokens from being forever locked. * * `_data` is additional data, it has no specified format and it is sent in call to `to`. * * This internal function is equivalent to {safeTransferFrom}, and can be used to e.g. * implement alternative mechanisms to perform token transfer, such as signature-based. * * Requirements: * * - `from` cannot be the zero address. * - `to` cannot be the zero address. * - `tokenId` token must exist and be owned by `from`. * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer. * * Emits a {Transfer} event. */ function _safeTransfer( address from, address to, uint256 tokenId, bytes memory _data ) internal virtual { _transfer(from, to, tokenId); require(_checkOnERC721Received(from, to, tokenId, _data), "ERC721: transfer to non ERC721Receiver implementer"); } /** * @dev Returns whether `tokenId` exists. * * Tokens can be managed by their owner or approved accounts via {approve} or {setApprovalForAll}. * * Tokens start existing when they are minted (`_mint`), * and stop existing when they are burned (`_burn`). */ function _exists(uint256 tokenId) internal view virtual returns (bool) { return _owners[tokenId] != address(0); } /** * @dev Returns whether `spender` is allowed to manage `tokenId`. * * Requirements: * * - `tokenId` must exist. */ function _isApprovedOrOwner(address spender, uint256 tokenId) internal view virtual returns (bool) { require(_exists(tokenId), "ERC721: operator query for nonexistent token"); address owner = ERC721.ownerOf(tokenId); return (spender == owner || getApproved(tokenId) == spender || isApprovedForAll(owner, spender)); } /** * @dev Safely mints `tokenId` and transfers it to `to`. * * Requirements: * * - `tokenId` must not exist. * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer. * * Emits a {Transfer} event. */ function _safeMint(address to, uint256 tokenId) internal virtual { _safeMint(to, tokenId, ""); } /** * @dev Same as {xref-ERC721-_safeMint-address-uint256-}[`_safeMint`], with an additional `data` parameter which is * forwarded in {IERC721Receiver-onERC721Received} to contract recipients. */ function _safeMint( address to, uint256 tokenId, bytes memory _data ) internal virtual { _mint(to, tokenId); require( _checkOnERC721Received(address(0), to, tokenId, _data), "ERC721: transfer to non ERC721Receiver implementer" ); } /** * @dev Mints `tokenId` and transfers it to `to`. * * WARNING: Usage of this method is discouraged, use {_safeMint} whenever possible * * Requirements: * * - `tokenId` must not exist. * - `to` cannot be the zero address. * * Emits a {Transfer} event. */ function _mint(address to, uint256 tokenId) internal virtual { require(to != address(0), "ERC721: mint to the zero address"); require(!_exists(tokenId), "ERC721: token already minted"); _beforeTokenTransfer(address(0), to, tokenId); _balances[to] += 1; _owners[tokenId] = to; emit Transfer(address(0), to, tokenId); _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 = ERC721.ownerOf(tokenId); _beforeTokenTransfer(owner, address(0), tokenId); // Clear approvals _approve(address(0), tokenId); _balances[owner] -= 1; delete _owners[tokenId]; emit Transfer(owner, address(0), tokenId); _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(ERC721.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 a {Approval} event. */ function _approve(address to, uint256 tokenId) internal virtual { _tokenApprovals[tokenId] = to; emit Approval(ERC721.ownerOf(tokenId), to, tokenId); } /** * @dev Approve `operator` to operate on all of `owner` tokens * * Emits a {ApprovalForAll} event. */ function _setApprovalForAll( address owner, address operator, bool approved ) internal virtual { require(owner != operator, "ERC721: approve to caller"); _operatorApprovals[owner][operator] = approved; emit ApprovalForAll(owner, operator, approved); } /** * @dev Internal function to invoke {IERC721Receiver-onERC721Received} on a target address. * The call is not executed if the target address is not a contract. * * @param from address representing the previous owner of the given token ID * @param to target address that will receive the tokens * @param tokenId uint256 ID of the token to be transferred * @param _data bytes optional data to send along with the call * @return bool whether the call correctly returned the expected magic value */ function _checkOnERC721Received( address from, address to, uint256 tokenId, bytes memory _data ) private returns (bool) { if (to.isContract()) { try IERC721Receiver(to).onERC721Received(_msgSender(), from, tokenId, _data) returns (bytes4 retval) { return retval == IERC721Receiver.onERC721Received.selector; } catch (bytes memory reason) { if (reason.length == 0) { revert("ERC721: transfer to non ERC721Receiver implementer"); } else { assembly { revert(add(32, reason), mload(reason)) } } } } else { return true; } } /** * @dev Hook that is called before any token transfer. This includes minting * and burning. * * Calling conditions: * * - When `from` and `to` are both non-zero, ``from``'s `tokenId` will be * transferred to `to`. * - When `from` is zero, `tokenId` will be minted for `to`. * - When `to` is zero, ``from``'s `tokenId` will be burned. * - `from` and `to` are never both zero. * * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks]. */ function _beforeTokenTransfer( address from, address to, uint256 tokenId ) internal virtual {} /** * @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 {} }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.5.0) (token/ERC721/extensions/IERC721Enumerable.sol) pragma solidity ^0.8.0; import "../IERC721.sol"; /** * @title ERC-721 Non-Fungible Token Standard, optional enumeration extension * @dev See https://eips.ethereum.org/EIPS/eip-721 */ interface IERC721Enumerable is IERC721 { /** * @dev Returns the total amount of tokens stored by the contract. */ function totalSupply() external view returns (uint256); /** * @dev Returns a token ID owned by `owner` at a given `index` of its token list. * Use along with {balanceOf} to enumerate all of ``owner``'s tokens. */ function tokenOfOwnerByIndex(address owner, uint256 index) external view returns (uint256); /** * @dev Returns a token ID at a given `index` of all the tokens stored by the contract. * Use along with {totalSupply} to enumerate all tokens. */ function tokenByIndex(uint256 index) external view returns (uint256); }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (token/ERC721/IERC721.sol) pragma solidity ^0.8.0; import "../../utils/introspection/IERC165.sol"; /** * @dev Required interface of an ERC721 compliant contract. */ interface IERC721 is IERC165 { /** * @dev Emitted when `tokenId` token is transferred from `from` to `to`. */ event Transfer(address indexed from, address indexed to, uint256 indexed tokenId); /** * @dev Emitted when `owner` enables `approved` to manage the `tokenId` token. */ event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId); /** * @dev Emitted when `owner` enables or disables (`approved`) `operator` to manage all of its assets. */ event ApprovalForAll(address indexed owner, address indexed operator, bool approved); /** * @dev Returns the number of tokens in ``owner``'s account. */ function balanceOf(address owner) external view returns (uint256 balance); /** * @dev Returns the owner of the `tokenId` token. * * Requirements: * * - `tokenId` must exist. */ function ownerOf(uint256 tokenId) external view returns (address owner); /** * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients * are aware of the ERC721 protocol to prevent tokens from being forever locked. * * Requirements: * * - `from` cannot be the zero address. * - `to` cannot be the zero address. * - `tokenId` token must exist and be owned by `from`. * - If the caller is not `from`, it must be have been allowed to move this token by either {approve} or {setApprovalForAll}. * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer. * * Emits a {Transfer} event. */ function safeTransferFrom( address from, address to, uint256 tokenId ) external; /** * @dev Transfers `tokenId` token from `from` to `to`. * * WARNING: Usage of this method is discouraged, use {safeTransferFrom} whenever possible. * * Requirements: * * - `from` cannot be the zero address. * - `to` cannot be the zero address. * - `tokenId` token must be owned by `from`. * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}. * * Emits a {Transfer} event. */ function transferFrom( address from, address to, uint256 tokenId ) external; /** * @dev Gives permission to `to` to transfer `tokenId` token to another account. * The approval is cleared when the token is transferred. * * Only a single account can be approved at a time, so approving the zero address clears previous approvals. * * Requirements: * * - The caller must own the token or be an approved operator. * - `tokenId` must exist. * * Emits an {Approval} event. */ function approve(address to, uint256 tokenId) external; /** * @dev Returns the account approved for `tokenId` token. * * Requirements: * * - `tokenId` must exist. */ function getApproved(uint256 tokenId) external view returns (address operator); /** * @dev Approve or remove `operator` as an operator for the caller. * Operators can call {transferFrom} or {safeTransferFrom} for any token owned by the caller. * * Requirements: * * - The `operator` cannot be the caller. * * Emits an {ApprovalForAll} event. */ function setApprovalForAll(address operator, bool _approved) external; /** * @dev Returns if the `operator` is allowed to manage all of the assets of `owner`. * * See {setApprovalForAll} */ function isApprovedForAll(address owner, address operator) external view returns (bool); /** * @dev Safely transfers `tokenId` token from `from` to `to`. * * Requirements: * * - `from` cannot be the zero address. * - `to` cannot be the zero address. * - `tokenId` token must exist and be owned by `from`. * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}. * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer. * * Emits a {Transfer} event. */ function safeTransferFrom( address from, address to, uint256 tokenId, bytes calldata data ) external; }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (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 IERC721Receiver { /** * @dev Whenever an {IERC721} `tokenId` token is transferred to this contract via {IERC721-safeTransferFrom} * by `operator` from `from`, this function is called. * * It must return its Solidity selector to confirm the token transfer. * If any other value is returned or the interface is not implemented by the recipient, the transfer will be reverted. * * The selector can be obtained in Solidity with `IERC721.onERC721Received.selector`. */ function onERC721Received( address operator, address from, uint256 tokenId, bytes calldata data ) external returns (bytes4); }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (token/ERC721/extensions/IERC721Metadata.sol) pragma solidity ^0.8.0; import "../IERC721.sol"; /** * @title ERC-721 Non-Fungible Token Standard, optional metadata extension * @dev See https://eips.ethereum.org/EIPS/eip-721 */ interface IERC721Metadata is IERC721 { /** * @dev Returns the token collection name. */ function name() external view returns (string memory); /** * @dev Returns the token collection symbol. */ function symbol() external view returns (string memory); /** * @dev Returns the Uniform Resource Identifier (URI) for `tokenId` token. */ function tokenURI(uint256 tokenId) external view returns (string memory); }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.5.0) (utils/Address.sol) pragma solidity ^0.8.1; /** * @dev Collection of functions related to the address type */ library Address { /** * @dev Returns true if `account` is a contract. * * [IMPORTANT] * ==== * It is unsafe to assume that an address for which this function returns * false is an externally-owned account (EOA) and not a contract. * * Among others, `isContract` will return false for the following * types of addresses: * * - an externally-owned account * - a contract in construction * - an address where a contract will be created * - an address where a contract lived, but was destroyed * ==== * * [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 Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], * but performing a delegate call. * * _Available since v3.4._ */ function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) { return functionDelegateCall(target, data, "Address: low-level delegate call failed"); } /** * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`], * but performing a delegate call. * * _Available since v3.4._ */ function functionDelegateCall( address target, bytes memory data, string memory errorMessage ) internal returns (bytes memory) { require(isContract(target), "Address: delegate call to non-contract"); (bool success, bytes memory returndata) = target.delegatecall(data); return verifyCallResult(success, returndata, errorMessage); } /** * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the * revert reason using the provided one. * * _Available since v4.3._ */ function verifyCallResult( bool success, bytes memory returndata, string memory errorMessage ) internal pure returns (bytes memory) { if (success) { return returndata; } else { // Look for revert reason and bubble it up if present if (returndata.length > 0) { // The easiest way to bubble the revert reason is using memory via assembly assembly { let returndata_size := mload(returndata) revert(add(32, returndata), returndata_size) } } else { revert(errorMessage); } } } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (utils/introspection/ERC165.sol) pragma solidity ^0.8.0; import "./IERC165.sol"; /** * @dev Implementation of the {IERC165} interface. * * Contracts that want to implement ERC165 should inherit from this contract and override {supportsInterface} to check * for the additional interface id that will be supported. For example: * * ```solidity * function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) { * return interfaceId == type(MyInterface).interfaceId || super.supportsInterface(interfaceId); * } * ``` * * Alternatively, {ERC165Storage} provides an easier to use but more expensive implementation. */ abstract contract ERC165 is IERC165 { /** * @dev See {IERC165-supportsInterface}. */ function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) { return interfaceId == type(IERC165).interfaceId; } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (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: AGPL-3.0-only pragma solidity >=0.8.0; /// @notice Modern and gas efficient ERC20 + EIP-2612 implementation. /// @author Solmate (https://github.com/Rari-Capital/solmate/blob/main/src/tokens/ERC20.sol) /// @author Modified from Uniswap (https://github.com/Uniswap/uniswap-v2-core/blob/master/contracts/UniswapV2ERC20.sol) /// @dev Do not manually set balances without updating totalSupply, as the sum of all user balances must not exceed it. abstract contract ERC20 { /*/////////////////////////////////////////////////////////////// EVENTS //////////////////////////////////////////////////////////////*/ event Transfer(address indexed from, address indexed to, uint256 amount); event Approval(address indexed owner, address indexed spender, uint256 amount); /*/////////////////////////////////////////////////////////////// METADATA STORAGE //////////////////////////////////////////////////////////////*/ string public name; string public symbol; uint8 public immutable decimals; /*/////////////////////////////////////////////////////////////// ERC20 STORAGE //////////////////////////////////////////////////////////////*/ uint256 public totalSupply; mapping(address => uint256) public balanceOf; mapping(address => mapping(address => uint256)) public allowance; /*/////////////////////////////////////////////////////////////// EIP-2612 STORAGE //////////////////////////////////////////////////////////////*/ bytes32 public constant PERMIT_TYPEHASH = keccak256("Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)"); uint256 internal immutable INITIAL_CHAIN_ID; bytes32 internal immutable INITIAL_DOMAIN_SEPARATOR; mapping(address => uint256) public nonces; /*/////////////////////////////////////////////////////////////// CONSTRUCTOR //////////////////////////////////////////////////////////////*/ constructor( string memory _name, string memory _symbol, uint8 _decimals ) { name = _name; symbol = _symbol; decimals = _decimals; INITIAL_CHAIN_ID = block.chainid; INITIAL_DOMAIN_SEPARATOR = computeDomainSeparator(); } /*/////////////////////////////////////////////////////////////// ERC20 LOGIC //////////////////////////////////////////////////////////////*/ function approve(address spender, uint256 amount) public virtual returns (bool) { allowance[msg.sender][spender] = amount; emit Approval(msg.sender, spender, amount); return true; } function transfer(address to, uint256 amount) public virtual returns (bool) { balanceOf[msg.sender] -= amount; // Cannot overflow because the sum of all user // balances can't exceed the max uint256 value. unchecked { balanceOf[to] += amount; } emit Transfer(msg.sender, to, amount); return true; } function transferFrom( address from, address to, uint256 amount ) public virtual returns (bool) { uint256 allowed = allowance[from][msg.sender]; // Saves gas for limited approvals. if (allowed != type(uint256).max) allowance[from][msg.sender] = allowed - amount; balanceOf[from] -= amount; // Cannot overflow because the sum of all user // balances can't exceed the max uint256 value. unchecked { balanceOf[to] += amount; } emit Transfer(from, to, amount); return true; } /*/////////////////////////////////////////////////////////////// EIP-2612 LOGIC //////////////////////////////////////////////////////////////*/ function permit( address owner, address spender, uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s ) public virtual { require(deadline >= block.timestamp, "PERMIT_DEADLINE_EXPIRED"); // Unchecked because the only math done is incrementing // the owner's nonce which cannot realistically overflow. unchecked { bytes32 digest = keccak256( abi.encodePacked( "\x19\x01", DOMAIN_SEPARATOR(), keccak256(abi.encode(PERMIT_TYPEHASH, owner, spender, value, nonces[owner]++, deadline)) ) ); address recoveredAddress = ecrecover(digest, v, r, s); require(recoveredAddress != address(0) && recoveredAddress == owner, "INVALID_SIGNER"); allowance[recoveredAddress][spender] = value; } emit Approval(owner, spender, value); } function DOMAIN_SEPARATOR() public view virtual returns (bytes32) { return block.chainid == INITIAL_CHAIN_ID ? INITIAL_DOMAIN_SEPARATOR : computeDomainSeparator(); } function computeDomainSeparator() internal view virtual returns (bytes32) { return keccak256( abi.encode( keccak256("EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)"), keccak256(bytes(name)), keccak256("1"), block.chainid, address(this) ) ); } /*/////////////////////////////////////////////////////////////// INTERNAL MINT/BURN LOGIC //////////////////////////////////////////////////////////////*/ function _mint(address to, uint256 amount) internal virtual { totalSupply += amount; // Cannot overflow because the sum of all user // balances can't exceed the max uint256 value. unchecked { balanceOf[to] += amount; } emit Transfer(address(0), to, amount); } function _burn(address from, uint256 amount) internal virtual { balanceOf[from] -= amount; // Cannot underflow because a user's balance // will never be larger than the total supply. unchecked { totalSupply -= amount; } emit Transfer(from, address(0), amount); } }
{ "optimizer": { "enabled": true, "runs": 1000 }, "outputSelection": { "*": { "*": [ "evm.bytecode", "evm.deployedBytecode", "devdoc", "userdoc", "metadata", "abi" ] } }, "libraries": {} }
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Contract Creation Code
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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)
0000000000000000000000000000000000000000000000000de0b6b3a76400000000000000000000000000000000000000000000000000000de0b6b3a764000000000000000000000000000000000000000000000000000000000000000000100000000000000000000000000000000000000000000000000000000000000001000000000000000000000000000000000000000000000000000000000000000100000000000000000000000000000000000000000000000000000000000000c0000000000000000000000000000000000000000000000000000000000000004368747470733a2f2f697066732e696f2f697066732f516d5332797045716b6164645a56546978386d526533663134444a6b74596641513769626b676e6863466b3936370000000000000000000000000000000000000000000000000000000000
-----Decoded View---------------
Arg [0] : _machineConfig (tuple): System.Collections.Generic.List`1[Nethereum.ABI.FunctionEncoding.ParameterOutput]
Arg [1] : ownershipTokenURI (string): https://ipfs.io/ipfs/QmS2ypEqkaddZVTix8mRe3f14DJktYfAQ7ibkgnhcFk967
-----Encoded View---------------
10 Constructor Arguments found :
Arg [0] : 0000000000000000000000000000000000000000000000000de0b6b3a7640000
Arg [1] : 0000000000000000000000000000000000000000000000000de0b6b3a7640000
Arg [2] : 0000000000000000000000000000000000000000000000000000000000000010
Arg [3] : 0000000000000000000000000000000000000000000000000000000000000001
Arg [4] : 0000000000000000000000000000000000000000000000000000000000000001
Arg [5] : 00000000000000000000000000000000000000000000000000000000000000c0
Arg [6] : 0000000000000000000000000000000000000000000000000000000000000043
Arg [7] : 68747470733a2f2f697066732e696f2f697066732f516d5332797045716b6164
Arg [8] : 645a56546978386d526533663134444a6b74596641513769626b676e6863466b
Arg [9] : 3936370000000000000000000000000000000000000000000000000000000000
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