Feature Tip: Add private address tag to any address under My Name Tag !
ERC-721
Overview
Max Total Supply
2,719 House
Holders
130
Market
Volume (24H)
N/A
Min Price (24H)
N/A
Max Price (24H)
N/A
Other Info
Token Contract
Balance
2 HouseLoading...
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# | Exchange | Pair | Price | 24H Volume | % Volume |
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Contract Name:
House
Compiler Version
v0.8.4+commit.c7e474f2
Optimization Enabled:
Yes with 200 runs
Other Settings:
default evmVersion
Contract Source Code (Solidity Standard Json-Input format)
// SPDX-License-Identifier: MIT LICENSE pragma solidity ^0.8.0; import "@openzeppelin/contracts/access/Ownable.sol"; import "@openzeppelin/contracts/security/Pausable.sol"; import "@openzeppelin/contracts/token/ERC721/extensions/ERC721Enumerable.sol"; import "./interfaces/IHouse.sol"; import "./interfaces/IHabitat.sol"; import "./interfaces/IHouseTraits.sol"; import "./interfaces/IRandomizer.sol"; contract House is IHouse, ERC721Enumerable, Ownable, Pausable { struct LastWrite { uint64 time; uint64 blockNum; } event TokenMinted(address indexed owner, uint256 indexed tokenId, uint256 blockNum, uint256 timeStamp); event TestTokenMinted(address indexed owner, uint256 indexed tokenId); event ShackMinted(address indexed owner,uint256 indexed tokenId, uint256 blockNum, uint256 timeStamp); event RanchMinted(address indexed owner,uint256 indexed tokenId, uint256 blockNum, uint256 timeStamp); event MansionMinted(address indexed owner,uint256 indexed tokenId, uint256 blockNum, uint256 timeStamp); event ShackStolen(address indexed owner, address indexed previous, uint256 indexed tokenId, uint256 blockNum, uint256 timeStamp); event RanchStolen(address indexed owner, address indexed previous, uint256 indexed tokenId, uint256 blockNum, uint256 timeStamp); event MansionStolen(address indexed owner, address indexed previous, uint256 indexed tokenId, uint256 blockNum, uint256 timeStamp); event ShackBurned(uint256 indexed tokenId, uint256 blockNum, uint256 timeStamp); event RanchBurned(uint256 indexed tokenId, uint256 blockNum, uint256 timeStamp); event MansionBurned(uint256 indexed tokenId, uint256 blockNum, uint256 timeStamp); event ShackStaked(address indexed owner,uint256 indexed tokenId, uint256 blockNum, uint256 timeStamp); event RanchStaked(address indexed owner,uint256 indexed tokenId, uint256 blockNum, uint256 timeStamp); event MansionStaked(address indexed owner,uint256 indexed tokenId, uint256 blockNum, uint256 timeStamp); event ShackUnStaked(address indexed owner,uint256 indexed tokenId, uint256 blockNum, uint256 timeStamp); event RanchUnStaked(address indexed owner,uint256 indexed tokenId, uint256 blockNum, uint256 timeStamp); event MansionUnStaked(address indexed owner,uint256 indexed tokenId, uint256 blockNum, uint256 timeStamp); // max number of tokens that can be minted: 10,000 in production uint256 public maxTokens; // number of tokens have been minted so far uint16 public override minted; // mapping tokenId => token's traits mapping(uint256 => HouseStruct) private tokenTraits; // mapping from hashed(tokenTrait) to the tokenId it's associated with // used to ensure there are no duplicates mapping(uint256 => uint256) public existingCombinations; // Tracks the last block and timestamp that a caller has written to state. // Disallow some access to functions if they occur while a change is being written. mapping(address => LastWrite) private lastWriteAddress; mapping(uint256 => LastWrite) private lastWriteToken; // list of probabilities for each trait type // 0 is associated with Shack, 1 is associated with Ranch, 2 is associated with Mansion uint8[][3] public rarities; // list of aliases for Walker's Alias algorithm // 0 is associated with Shack, 1 is associated with Ranch, 2 is associated with Mansion uint8[][3] public aliases; // reference to the Habitat contract to allow transfers to it without any approval IHabitat public habitat; // reference to House Traits IHouseTraits public houseTraits; // reference to Randomizer IRandomizer public randomizer; // mapping address => allowedToCallFunctions mapping(address => bool) private admins; constructor(uint256 _maxTokens) ERC721("HouseNFT", "House") { maxTokens = _maxTokens; _pause(); // A.J. Walker's Alias Algorithm // Shack // body rarities[0] = [80]; aliases[0] = [0]; // Ranch // body rarities[1] = [100]; aliases[1] = [0]; // Mansion rarities[2] = [100]; aliases[2] = [0]; } /** CRITICAL TO SETUP / MODIFIERS */ modifier requireContractsSet() { require(address(houseTraits) != address(0) && address(habitat) != address(0) && address(randomizer) != address(0), "Contracts not set"); _; } modifier blockIfChangingAddress() { // frens can always call whenever they want :) require(admins[_msgSender()] || lastWriteAddress[tx.origin].blockNum < block.number, "hmmmm what doing?"); _; } modifier blockIfChangingToken(uint256 tokenId) { // frens can always call whenever they want :) require(admins[_msgSender()] || lastWriteToken[tokenId].blockNum < block.number, "hmmmm what doing?"); _; } function setContracts(address _houseTraits, address _habitat, address _rand) external onlyOwner { houseTraits = IHouseTraits(_houseTraits); habitat = IHabitat(_habitat); randomizer = IRandomizer(_rand); } function getTokenWriteBlock(uint256 tokenId) external view override returns(uint64) { require(admins[_msgSender()], "Only admins can call this"); return lastWriteToken[tokenId].blockNum; } /** * Mint a token - any payment / game logic should be handled in the game contract. * This will just generate random traits and mint a token to a designated address. */ function mint(address recipient, uint256 seed) external override whenNotPaused { require(admins[_msgSender()], "Only admins can call this"); require(minted + 1 <= maxTokens, "All tokens minted"); minted++; generate(recipient, minted, seed); if(tx.origin != recipient && recipient != address(habitat)) { // Stolen! if(tokenTraits[minted].roll == 0) { emit ShackStolen(recipient, tx.origin, minted, block.number, block.timestamp); } else if(tokenTraits[minted].roll == 1) { emit RanchStolen(recipient, tx.origin, minted, block.number, block.timestamp); } else { emit MansionStolen(recipient, tx.origin, minted, block.number, block.timestamp); } } _safeMint(recipient, minted); } /** * generates traits for a specific token, checking to make sure it's unique * @param tokenId the id of the token to generate traits for * @param seed a pseudorandom 256 bit number to derive traits from * @return t - a struct of traits for the given token ID */ function generate(address recipient, uint256 tokenId, uint256 seed) public returns (HouseStruct memory t) { t = selectTraits(seed); tokenTraits[tokenId] = t; emit TokenMinted(recipient, tokenId, block.number, block.timestamp); emit TestTokenMinted(recipient, tokenId); if(t.roll == 0) { emit ShackMinted(recipient, tokenId, block.number, block.timestamp); } else if(t.roll == 1) { emit RanchMinted(recipient, tokenId, block.number, block.timestamp); } else { emit MansionMinted(recipient, tokenId, block.number, block.timestamp); } return t; } /** * selects the species and all of its traits based on the seed value * @param seed a pseudorandom 256 bit number to derive traits from * @return t - a struct of randomly selected traits */ function selectTraits(uint256 seed) internal view returns (HouseStruct memory t) { // Shack & Ranch & Mansion percet is 70% & 25% & 5% if (uint16(seed & 0xFFFF) % 100 < 5) { t.roll = 2; } else if(uint16(seed & 0xFFFF) % 100 < 30) { t.roll = 1; } else { t.roll = 0; } uint8 shift = 0; if (t.roll == 0) { shift = 0; } else if (t.roll == 1) { shift = 1; } else { shift = 2; } seed >>= 16; t.body = selectTrait(uint16(seed & 0xFFFF), 0 + shift); } /** * uses A.J. Walker's Alias algorithm for O(1) rarity table lookup * ensuring O(1) instead of O(n) reduces mint cost by more than 50% * probability & alias tables are generated off-chain beforehand * @param seed portion of the 256 bit seed to remove trait correlation * @param traitType the trait type to select a trait for * @return the ID of the randomly selected trait */ function selectTrait(uint16 seed, uint8 traitType) internal view returns (uint8) { uint8 trait = uint8(seed) % uint8(rarities[traitType].length); return aliases[traitType][trait]; } /** * converts a struct to a 256 bit hash to check for uniqueness * @param s the struct to pack into a hash * @return the 256 bit hash of the struct */ function structToHash(HouseStruct memory s) internal pure returns (uint256) { return uint256(keccak256( abi.encodePacked( s.roll, s.body) )); } /** * Burn a token - any game logic should be handled before this function. */ function burn(uint256 tokenId) external override whenNotPaused { require(admins[_msgSender()], "Only admins can call this"); _burn(tokenId); minted -= 1; if(tokenTraits[tokenId].roll == 2) { emit MansionBurned(tokenId, block.number, block.timestamp); } else if (tokenTraits[tokenId].roll == 1) { emit RanchBurned(tokenId, block.number, block.timestamp); } else { emit ShackBurned(tokenId, block.number, block.timestamp); } } function updateOriginAccess(uint16[] memory tokenIds) external override { require(admins[_msgSender()], "Only admins can call this"); uint64 blockNum = uint64(block.number); uint64 time = uint64(block.timestamp); lastWriteAddress[tx.origin] = LastWrite(time, blockNum); for (uint256 i = 0; i < tokenIds.length; i++) { lastWriteToken[tokenIds[i]] = LastWrite(time, blockNum); } } function transferFrom( address from, address to, uint256 tokenId ) public virtual override(ERC721, IERC721) blockIfChangingToken(tokenId) { // allow admin contracts to be send without approval if(!admins[_msgSender()]) { require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: transfer caller is not owner nor approved"); } _transfer(from, to, tokenId); } /** * checks if a token is a Shack * @param tokenId the ID of the token to check * @return bool - whether or not a token is a Shack */ function isShack(uint256 tokenId) external view override blockIfChangingToken(tokenId) returns (bool) { // Sneaky cats will be slain if they try to peep this after mint. Nice try. IHouse.HouseStruct memory s = tokenTraits[tokenId]; return s.roll == 0; } /** * checks if a token is a Ranch * @param tokenId the ID of the token to check * @return bool - whether or not a token is a Ranch */ function isRanch(uint256 tokenId) external view override blockIfChangingToken(tokenId) returns (bool) { // Sneaky cats will be slain if they try to peep this after mint. Nice try. IHouse.HouseStruct memory s = tokenTraits[tokenId]; return s.roll == 1; } /** * checks if a token is a Mansion * @param tokenId the ID of the token to check * @return bool - whether or not a token is a Mansion */ function isMansion(uint256 tokenId) external view override blockIfChangingToken(tokenId) returns (bool) { // Sneaky cats will be slain if they try to peep this after mint. Nice try. IHouse.HouseStruct memory s = tokenTraits[tokenId]; return s.roll == 2; } function getMaxTokens() external view override returns (uint256) { return maxTokens; } /** ADMIN */ /** * enables owner to pause / unpause minting */ function setPaused(bool _paused) external requireContractsSet onlyOwner { if (_paused) _pause(); else _unpause(); } /** * enables an address to mint / burn * @param addr the address to enable */ function addAdmin(address addr) external onlyOwner { admins[addr] = true; } /** * disables an address from minting / burning * @param addr the address to disbale */ function removeAdmin(address addr) external onlyOwner { admins[addr] = false; } /** Traits */ function getTokenTraits(uint256 tokenId) external view override blockIfChangingAddress blockIfChangingToken(tokenId) returns (HouseStruct memory) { return tokenTraits[tokenId]; } function tokenURI(uint256 tokenId) public view override blockIfChangingAddress blockIfChangingToken(tokenId) returns (string memory) { require(_exists(tokenId), "Token ID does not exist"); return houseTraits.tokenURI(tokenId); } /** OVERRIDES FOR SAFETY */ function tokenOfOwnerByIndex(address owner, uint256 index) public view virtual override(ERC721Enumerable, IERC721Enumerable) blockIfChangingAddress returns (uint256) { // Y U checking on this address in the same block it's being modified... hmmmm require(admins[_msgSender()] || lastWriteAddress[owner].blockNum < block.number, "hmmmm what doing?"); uint256 tokenId = super.tokenOfOwnerByIndex(owner, index); require(admins[_msgSender()] || lastWriteToken[tokenId].blockNum < block.number, "hmmmm what doing?"); return tokenId; } function balanceOf(address owner) public view virtual override(ERC721, IERC721) blockIfChangingAddress returns (uint256) { // Y U checking on this address in the same block it's being modified... hmmmm require(admins[_msgSender()] || lastWriteAddress[owner].blockNum < block.number, "hmmmm what doing?"); return super.balanceOf(owner); } function ownerOf(uint256 tokenId) public view virtual override(ERC721, IERC721) blockIfChangingAddress blockIfChangingToken(tokenId) returns (address) { address addr = super.ownerOf(tokenId); // Y U checking on this address in the same block it's being modified... hmmmm require(admins[_msgSender()] || lastWriteAddress[addr].blockNum < block.number, "hmmmm what doing?"); return addr; } function tokenByIndex(uint256 index) public view virtual override(ERC721Enumerable, IERC721Enumerable) returns (uint256) { uint256 tokenId = super.tokenByIndex(index); // NICE TRY TOAD DRAGON require(admins[_msgSender()] || lastWriteToken[tokenId].blockNum < block.number, "hmmmm what doing?"); return tokenId; } function approve(address to, uint256 tokenId) public virtual override(ERC721, IERC721) blockIfChangingToken(tokenId) { super.approve(to, tokenId); } function getApproved(uint256 tokenId) public view virtual override(ERC721, IERC721) blockIfChangingToken(tokenId) returns (address) { return super.getApproved(tokenId); } function setApprovalForAll(address operator, bool approved) public virtual override(ERC721, IERC721) blockIfChangingAddress { super.setApprovalForAll(operator, approved); } function isApprovedForAll(address owner, address operator) public view virtual override(ERC721, IERC721) blockIfChangingAddress returns (bool) { return super.isApprovedForAll(owner, operator); } function safeTransferFrom( address from, address to, uint256 tokenId ) public virtual override(ERC721, IERC721) blockIfChangingToken(tokenId) { super.safeTransferFrom(from, to, tokenId); } function safeTransferFrom( address from, address to, uint256 tokenId, bytes memory _data ) public virtual override(ERC721, IERC721) blockIfChangingToken(tokenId) { super.safeTransferFrom(from, to, tokenId, _data); } //----------friedrich----------- /** * Event * @param tokenId the ID of the token stacked */ function emitShackStakedEvent(address owner, uint256 tokenId) external override whenNotPaused { emit ShackStaked(owner, tokenId, block.number, block.timestamp); } /** * Event * @param tokenId the ID of the token stacked */ function emitRanchStakedEvent(address owner, uint256 tokenId) external override whenNotPaused { emit RanchStaked(owner, tokenId, block.number, block.timestamp); } /** * Event * @param tokenId the ID of the token stacked */ function emitMansionStakedEvent(address owner, uint256 tokenId) external override whenNotPaused { emit MansionStaked(owner, tokenId, block.number, block.timestamp); } /** * Event * @param tokenId the ID of the token stacked */ function emitShackUnStakedEvent(address owner, uint256 tokenId) external override whenNotPaused { emit ShackUnStaked(owner, tokenId, block.number, block.timestamp); } /** * Event * @param tokenId the ID of the token stacked */ function emitRanchUnStakedEvent(address owner, uint256 tokenId) external override whenNotPaused { emit RanchUnStaked(owner, tokenId, block.number, block.timestamp); } /** * Event * @param tokenId the ID of the token stacked */ function emitMansionUnStakedEvent(address owner, uint256 tokenId) external override whenNotPaused { emit MansionUnStaked(owner, tokenId, block.number, block.timestamp); } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.0 (access/Ownable.sol) pragma solidity ^0.8.0; import "../utils/Context.sol"; /** * @dev Contract module which provides a basic access control mechanism, where * there is an account (an owner) that can be granted exclusive access to * specific functions. * * By default, the owner account will be the one that deploys the contract. This * can later be changed with {transferOwnership}. * * This module is used through inheritance. It will make available the modifier * `onlyOwner`, which can be applied to your functions to restrict their use to * the owner. */ abstract contract Ownable is Context { address private _owner; event OwnershipTransferred(address indexed previousOwner, address indexed newOwner); /** * @dev Initializes the contract setting the deployer as the initial owner. */ constructor() { _transferOwnership(_msgSender()); } /** * @dev Returns the address of the current owner. */ function owner() public view virtual returns (address) { return _owner; } /** * @dev Throws if called by any account other than the owner. */ modifier onlyOwner() { require(owner() == _msgSender(), "Ownable: caller is not the owner"); _; } /** * @dev Leaves the contract without owner. It will not be possible to call * `onlyOwner` functions anymore. Can only be called by the current owner. * * NOTE: Renouncing ownership will leave the contract without an owner, * thereby removing any functionality that is only available to the owner. */ function renounceOwnership() public virtual onlyOwner { _transferOwnership(address(0)); } /** * @dev Transfers ownership of the contract to a new account (`newOwner`). * Can only be called by the current owner. */ function transferOwnership(address newOwner) public virtual onlyOwner { require(newOwner != address(0), "Ownable: new owner is the zero address"); _transferOwnership(newOwner); } /** * @dev Transfers ownership of the contract to a new account (`newOwner`). * Internal function without access restriction. */ function _transferOwnership(address newOwner) internal virtual { address oldOwner = _owner; _owner = newOwner; emit OwnershipTransferred(oldOwner, newOwner); } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.0 (security/Pausable.sol) pragma solidity ^0.8.0; import "../utils/Context.sol"; /** * @dev Contract module which allows children to implement an emergency stop * mechanism that can be triggered by an authorized account. * * This module is used through inheritance. It will make available the * modifiers `whenNotPaused` and `whenPaused`, which can be applied to * the functions of your contract. Note that they will not be pausable by * simply including this module, only once the modifiers are put in place. */ abstract contract Pausable is Context { /** * @dev Emitted when the pause is triggered by `account`. */ event Paused(address account); /** * @dev Emitted when the pause is lifted by `account`. */ event Unpaused(address account); bool private _paused; /** * @dev Initializes the contract in unpaused state. */ constructor() { _paused = false; } /** * @dev Returns true if the contract is paused, and false otherwise. */ function paused() public view virtual returns (bool) { return _paused; } /** * @dev Modifier to make a function callable only when the contract is not paused. * * Requirements: * * - The contract must not be paused. */ modifier whenNotPaused() { require(!paused(), "Pausable: paused"); _; } /** * @dev Modifier to make a function callable only when the contract is paused. * * Requirements: * * - The contract must be paused. */ modifier whenPaused() { require(paused(), "Pausable: not paused"); _; } /** * @dev Triggers stopped state. * * Requirements: * * - The contract must not be paused. */ function _pause() internal virtual whenNotPaused { _paused = true; emit Paused(_msgSender()); } /** * @dev Returns to normal state. * * Requirements: * * - The contract must be paused. */ function _unpause() internal virtual whenPaused { _paused = false; emit Unpaused(_msgSender()); } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.0 (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 LICENSE pragma solidity ^0.8.0; import "@openzeppelin/contracts/token/ERC721/extensions/IERC721Enumerable.sol"; interface IHouse is IERC721Enumerable { // House NFT struct struct HouseStruct { uint8 roll; //0 - Shack, 1 - Ranch, 2 - Mansion uint8 body; } function getTokenWriteBlock(uint256 tokenId) external view returns(uint64); function mint(address recipient, uint256 seed) external; function burn(uint256 tokenId) external; function updateOriginAccess(uint16[] memory tokenIds) external; function isShack(uint256 tokenId) external view returns(bool); function isRanch(uint256 tokenId) external view returns(bool); function isMansion(uint256 tokenId) external view returns(bool); function getMaxTokens() external view returns (uint256); function getTokenTraits(uint256 tokenId) external view returns (HouseStruct memory); function minted() external view returns (uint16); function emitShackStakedEvent(address owner, uint256 tokenId) external; function emitRanchStakedEvent(address owner, uint256 tokenId) external; function emitMansionStakedEvent(address owner, uint256 tokenId) external; function emitShackUnStakedEvent(address owner, uint256 tokenId) external; function emitRanchUnStakedEvent(address owner, uint256 tokenId) external; function emitMansionUnStakedEvent(address owner, uint256 tokenId) external; }
// SPDX-License-Identifier: MIT LICENSE pragma solidity ^0.8.0; interface IHabitat { function addManyToStakingPool(address account, uint16[] calldata tokenIds) external; function addManyHouseToStakingPool(address account, uint16[] calldata tokenIds) external; function randomCatOwner(uint256 seed) external view returns (address); function randomCrazyCatOwner(uint256 seed) external view returns (address); function isOwner(uint256 tokenId, address owner) external view returns (bool); }
// SPDX-License-Identifier: MIT LICENSE pragma solidity ^0.8.0; interface IHouseTraits { function tokenURI(uint256 tokenId) external view returns (string memory); }
// SPDX-License-Identifier: MIT LICENSE pragma solidity ^0.8.0; interface IRandomizer { function commitId() external view returns (uint16); function getCommitRandom(uint16 id) external view returns (uint256); function random() external returns (uint256); function sRandom(uint256 tokenId) external returns (uint256); }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.0 (utils/Context.sol) pragma solidity ^0.8.0; /** * @dev Provides information about the current execution context, including the * sender of the transaction and its data. While these are generally available * via msg.sender and msg.data, they should not be accessed in such a direct * manner, since when dealing with meta-transactions the account sending and * paying for execution may not be the actual sender (as far as an application * is concerned). * * This contract is only required for intermediate, library-like contracts. */ abstract contract Context { function _msgSender() internal view virtual returns (address) { return msg.sender; } function _msgData() internal view virtual returns (bytes calldata) { return msg.data; } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.0 (token/ERC721/ERC721.sol) pragma solidity ^0.8.0; import "./IERC721.sol"; import "./IERC721Receiver.sol"; import "./extensions/IERC721Metadata.sol"; import "../../utils/Address.sol"; import "../../utils/Context.sol"; import "../../utils/Strings.sol"; import "../../utils/introspection/ERC165.sol"; /** * @dev Implementation of https://eips.ethereum.org/EIPS/eip-721[ERC721] Non-Fungible Token Standard, including * the Metadata extension, but not including the Enumerable extension, which is available separately as * {ERC721Enumerable}. */ contract ERC721 is Context, ERC165, IERC721, IERC721Metadata { using Address for address; using Strings for uint256; // Token name string private _name; // Token symbol string private _symbol; // Mapping from token ID to owner address mapping(uint256 => address) private _owners; // Mapping owner address to token count mapping(address => uint256) private _balances; // Mapping from token ID to approved address mapping(uint256 => address) private _tokenApprovals; // Mapping from owner to operator approvals mapping(address => mapping(address => bool)) private _operatorApprovals; /** * @dev Initializes the contract by setting a `name` and a `symbol` to the token collection. */ constructor(string memory name_, string memory symbol_) { _name = name_; _symbol = symbol_; } /** * @dev See {IERC165-supportsInterface}. */ function supportsInterface(bytes4 interfaceId) public view virtual override(ERC165, IERC165) returns (bool) { return interfaceId == type(IERC721).interfaceId || interfaceId == type(IERC721Metadata).interfaceId || super.supportsInterface(interfaceId); } /** * @dev See {IERC721-balanceOf}. */ function balanceOf(address owner) public view virtual override returns (uint256) { require(owner != address(0), "ERC721: balance query for the zero address"); return _balances[owner]; } /** * @dev See {IERC721-ownerOf}. */ function ownerOf(uint256 tokenId) public view virtual override returns (address) { address owner = _owners[tokenId]; require(owner != address(0), "ERC721: owner query for nonexistent token"); return owner; } /** * @dev See {IERC721Metadata-name}. */ function name() public view virtual override returns (string memory) { return _name; } /** * @dev See {IERC721Metadata-symbol}. */ function symbol() public view virtual override returns (string memory) { return _symbol; } /** * @dev See {IERC721Metadata-tokenURI}. */ function tokenURI(uint256 tokenId) public view virtual override returns (string memory) { require(_exists(tokenId), "ERC721Metadata: URI query for nonexistent token"); string memory baseURI = _baseURI(); return bytes(baseURI).length > 0 ? string(abi.encodePacked(baseURI, tokenId.toString())) : ""; } /** * @dev Base URI for computing {tokenURI}. If set, the resulting URI for each * token will be the concatenation of the `baseURI` and the `tokenId`. Empty * by default, can be overriden in child contracts. */ function _baseURI() internal view virtual returns (string memory) { return ""; } /** * @dev See {IERC721-approve}. */ function approve(address to, uint256 tokenId) public virtual override { address owner = ERC721.ownerOf(tokenId); require(to != owner, "ERC721: approval to current owner"); require( _msgSender() == owner || isApprovedForAll(owner, _msgSender()), "ERC721: approve caller is not owner nor approved for all" ); _approve(to, tokenId); } /** * @dev See {IERC721-getApproved}. */ function getApproved(uint256 tokenId) public view virtual override returns (address) { require(_exists(tokenId), "ERC721: approved query for nonexistent token"); return _tokenApprovals[tokenId]; } /** * @dev See {IERC721-setApprovalForAll}. */ function setApprovalForAll(address operator, bool approved) public virtual override { _setApprovalForAll(_msgSender(), operator, approved); } /** * @dev See {IERC721-isApprovedForAll}. */ function isApprovedForAll(address owner, address operator) public view virtual override returns (bool) { return _operatorApprovals[owner][operator]; } /** * @dev See {IERC721-transferFrom}. */ function transferFrom( address from, address to, uint256 tokenId ) public virtual override { //solhint-disable-next-line max-line-length require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: transfer caller is not owner nor approved"); _transfer(from, to, tokenId); } /** * @dev See {IERC721-safeTransferFrom}. */ function safeTransferFrom( address from, address to, uint256 tokenId ) public virtual override { safeTransferFrom(from, to, tokenId, ""); } /** * @dev See {IERC721-safeTransferFrom}. */ function safeTransferFrom( address from, address to, uint256 tokenId, bytes memory _data ) public virtual override { require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: transfer caller is not owner nor approved"); _safeTransfer(from, to, tokenId, _data); } /** * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients * are aware of the ERC721 protocol to prevent tokens from being forever locked. * * `_data` is additional data, it has no specified format and it is sent in call to `to`. * * This internal function is equivalent to {safeTransferFrom}, and can be used to e.g. * implement alternative mechanisms to perform token transfer, such as signature-based. * * Requirements: * * - `from` cannot be the zero address. * - `to` cannot be the zero address. * - `tokenId` token must exist and be owned by `from`. * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer. * * Emits a {Transfer} event. */ function _safeTransfer( address from, address to, uint256 tokenId, bytes memory _data ) internal virtual { _transfer(from, to, tokenId); require(_checkOnERC721Received(from, to, tokenId, _data), "ERC721: transfer to non ERC721Receiver implementer"); } /** * @dev Returns whether `tokenId` exists. * * Tokens can be managed by their owner or approved accounts via {approve} or {setApprovalForAll}. * * Tokens start existing when they are minted (`_mint`), * and stop existing when they are burned (`_burn`). */ function _exists(uint256 tokenId) internal view virtual returns (bool) { return _owners[tokenId] != address(0); } /** * @dev Returns whether `spender` is allowed to manage `tokenId`. * * Requirements: * * - `tokenId` must exist. */ function _isApprovedOrOwner(address spender, uint256 tokenId) internal view virtual returns (bool) { require(_exists(tokenId), "ERC721: operator query for nonexistent token"); address owner = ERC721.ownerOf(tokenId); return (spender == owner || getApproved(tokenId) == spender || isApprovedForAll(owner, spender)); } /** * @dev Safely mints `tokenId` and transfers it to `to`. * * Requirements: * * - `tokenId` must not exist. * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer. * * Emits a {Transfer} event. */ function _safeMint(address to, uint256 tokenId) internal virtual { _safeMint(to, tokenId, ""); } /** * @dev Same as {xref-ERC721-_safeMint-address-uint256-}[`_safeMint`], with an additional `data` parameter which is * forwarded in {IERC721Receiver-onERC721Received} to contract recipients. */ function _safeMint( address to, uint256 tokenId, bytes memory _data ) internal virtual { _mint(to, tokenId); require( _checkOnERC721Received(address(0), to, tokenId, _data), "ERC721: transfer to non ERC721Receiver implementer" ); } /** * @dev Mints `tokenId` and transfers it to `to`. * * WARNING: Usage of this method is discouraged, use {_safeMint} whenever possible * * Requirements: * * - `tokenId` must not exist. * - `to` cannot be the zero address. * * Emits a {Transfer} event. */ function _mint(address to, uint256 tokenId) internal virtual { require(to != address(0), "ERC721: mint to the zero address"); require(!_exists(tokenId), "ERC721: token already minted"); _beforeTokenTransfer(address(0), to, tokenId); _balances[to] += 1; _owners[tokenId] = to; emit Transfer(address(0), to, tokenId); } /** * @dev Destroys `tokenId`. * The approval is cleared when the token is burned. * * Requirements: * * - `tokenId` must exist. * * Emits a {Transfer} event. */ function _burn(uint256 tokenId) internal virtual { address owner = ERC721.ownerOf(tokenId); _beforeTokenTransfer(owner, address(0), tokenId); // Clear approvals _approve(address(0), tokenId); _balances[owner] -= 1; delete _owners[tokenId]; emit Transfer(owner, address(0), tokenId); } /** * @dev Transfers `tokenId` from `from` to `to`. * As opposed to {transferFrom}, this imposes no restrictions on msg.sender. * * Requirements: * * - `to` cannot be the zero address. * - `tokenId` token must be owned by `from`. * * Emits a {Transfer} event. */ function _transfer( address from, address to, uint256 tokenId ) internal virtual { require(ERC721.ownerOf(tokenId) == from, "ERC721: transfer of token that is not own"); require(to != address(0), "ERC721: transfer to the zero address"); _beforeTokenTransfer(from, to, tokenId); // Clear approvals from the previous owner _approve(address(0), tokenId); _balances[from] -= 1; _balances[to] += 1; _owners[tokenId] = to; emit Transfer(from, to, tokenId); } /** * @dev Approve `to` to operate on `tokenId` * * Emits a {Approval} event. */ function _approve(address to, uint256 tokenId) internal virtual { _tokenApprovals[tokenId] = to; emit Approval(ERC721.ownerOf(tokenId), to, tokenId); } /** * @dev Approve `operator` to operate on all of `owner` tokens * * Emits a {ApprovalForAll} event. */ function _setApprovalForAll( address owner, address operator, bool approved ) internal virtual { require(owner != operator, "ERC721: approve to caller"); _operatorApprovals[owner][operator] = approved; emit ApprovalForAll(owner, operator, approved); } /** * @dev Internal function to invoke {IERC721Receiver-onERC721Received} on a target address. * The call is not executed if the target address is not a contract. * * @param from address representing the previous owner of the given token ID * @param to target address that will receive the tokens * @param tokenId uint256 ID of the token to be transferred * @param _data bytes optional data to send along with the call * @return bool whether the call correctly returned the expected magic value */ function _checkOnERC721Received( address from, address to, uint256 tokenId, bytes memory _data ) private returns (bool) { if (to.isContract()) { try IERC721Receiver(to).onERC721Received(_msgSender(), from, tokenId, _data) returns (bytes4 retval) { return retval == IERC721Receiver.onERC721Received.selector; } catch (bytes memory reason) { if (reason.length == 0) { revert("ERC721: transfer to non ERC721Receiver implementer"); } else { assembly { revert(add(32, reason), mload(reason)) } } } } else { return true; } } /** * @dev Hook that is called before any token transfer. This includes minting * and burning. * * Calling conditions: * * - When `from` and `to` are both non-zero, ``from``'s `tokenId` will be * transferred to `to`. * - When `from` is zero, `tokenId` will be minted for `to`. * - When `to` is zero, ``from``'s `tokenId` will be burned. * - `from` and `to` are never both zero. * * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks]. */ function _beforeTokenTransfer( address from, address to, uint256 tokenId ) internal virtual {} }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.0 (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 tokenId); /** * @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 v4.4.0 (token/ERC721/IERC721.sol) pragma solidity ^0.8.0; import "../../utils/introspection/IERC165.sol"; /** * @dev Required interface of an ERC721 compliant contract. */ interface IERC721 is IERC165 { /** * @dev Emitted when `tokenId` token is transferred from `from` to `to`. */ event Transfer(address indexed from, address indexed to, uint256 indexed tokenId); /** * @dev Emitted when `owner` enables `approved` to manage the `tokenId` token. */ event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId); /** * @dev Emitted when `owner` enables or disables (`approved`) `operator` to manage all of its assets. */ event ApprovalForAll(address indexed owner, address indexed operator, bool approved); /** * @dev Returns the number of tokens in ``owner``'s account. */ function balanceOf(address owner) external view returns (uint256 balance); /** * @dev Returns the owner of the `tokenId` token. * * Requirements: * * - `tokenId` must exist. */ function ownerOf(uint256 tokenId) external view returns (address owner); /** * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients * are aware of the ERC721 protocol to prevent tokens from being forever locked. * * Requirements: * * - `from` cannot be the zero address. * - `to` cannot be the zero address. * - `tokenId` token must exist and be owned by `from`. * - If the caller is not `from`, it must be have been allowed to move this token by either {approve} or {setApprovalForAll}. * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer. * * Emits a {Transfer} event. */ function safeTransferFrom( address from, address to, uint256 tokenId ) external; /** * @dev Transfers `tokenId` token from `from` to `to`. * * WARNING: Usage of this method is discouraged, use {safeTransferFrom} whenever possible. * * Requirements: * * - `from` cannot be the zero address. * - `to` cannot be the zero address. * - `tokenId` token must be owned by `from`. * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}. * * Emits a {Transfer} event. */ function transferFrom( address from, address to, uint256 tokenId ) external; /** * @dev Gives permission to `to` to transfer `tokenId` token to another account. * The approval is cleared when the token is transferred. * * Only a single account can be approved at a time, so approving the zero address clears previous approvals. * * Requirements: * * - The caller must own the token or be an approved operator. * - `tokenId` must exist. * * Emits an {Approval} event. */ function approve(address to, uint256 tokenId) external; /** * @dev Returns the account approved for `tokenId` token. * * Requirements: * * - `tokenId` must exist. */ function getApproved(uint256 tokenId) external view returns (address operator); /** * @dev Approve or remove `operator` as an operator for the caller. * Operators can call {transferFrom} or {safeTransferFrom} for any token owned by the caller. * * Requirements: * * - The `operator` cannot be the caller. * * Emits an {ApprovalForAll} event. */ function setApprovalForAll(address operator, bool _approved) external; /** * @dev Returns if the `operator` is allowed to manage all of the assets of `owner`. * * See {setApprovalForAll} */ function isApprovedForAll(address owner, address operator) external view returns (bool); /** * @dev Safely transfers `tokenId` token from `from` to `to`. * * Requirements: * * - `from` cannot be the zero address. * - `to` cannot be the zero address. * - `tokenId` token must exist and be owned by `from`. * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}. * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer. * * Emits a {Transfer} event. */ function safeTransferFrom( address from, address to, uint256 tokenId, bytes calldata data ) external; }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.0 (token/ERC721/IERC721Receiver.sol) pragma solidity ^0.8.0; /** * @title ERC721 token receiver interface * @dev Interface for any contract that wants to support safeTransfers * from ERC721 asset contracts. */ interface IERC721Receiver { /** * @dev Whenever an {IERC721} `tokenId` token is transferred to this contract via {IERC721-safeTransferFrom} * by `operator` from `from`, this function is called. * * It must return its Solidity selector to confirm the token transfer. * If any other value is returned or the interface is not implemented by the recipient, the transfer will be reverted. * * The selector can be obtained in Solidity with `IERC721.onERC721Received.selector`. */ function onERC721Received( address operator, address from, uint256 tokenId, bytes calldata data ) external returns (bytes4); }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.0 (token/ERC721/extensions/IERC721Metadata.sol) pragma solidity ^0.8.0; import "../IERC721.sol"; /** * @title ERC-721 Non-Fungible Token Standard, optional metadata extension * @dev See https://eips.ethereum.org/EIPS/eip-721 */ interface IERC721Metadata is IERC721 { /** * @dev Returns the token collection name. */ function name() external view returns (string memory); /** * @dev Returns the token collection symbol. */ function symbol() external view returns (string memory); /** * @dev Returns the Uniform Resource Identifier (URI) for `tokenId` token. */ function tokenURI(uint256 tokenId) external view returns (string memory); }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.0 (utils/Address.sol) pragma solidity ^0.8.0; /** * @dev Collection of functions related to the address type */ library Address { /** * @dev Returns true if `account` is a contract. * * [IMPORTANT] * ==== * It is unsafe to assume that an address for which this function returns * false is an externally-owned account (EOA) and not a contract. * * Among others, `isContract` will return false for the following * types of addresses: * * - an externally-owned account * - a contract in construction * - an address where a contract will be created * - an address where a contract lived, but was destroyed * ==== */ function isContract(address account) internal view returns (bool) { // This method relies on extcodesize, which returns 0 for contracts in // construction, since the code is only stored at the end of the // constructor execution. uint256 size; assembly { size := extcodesize(account) } return size > 0; } /** * @dev Replacement for Solidity's `transfer`: sends `amount` wei to * `recipient`, forwarding all available gas and reverting on errors. * * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost * of certain opcodes, possibly making contracts go over the 2300 gas limit * imposed by `transfer`, making them unable to receive funds via * `transfer`. {sendValue} removes this limitation. * * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more]. * * IMPORTANT: because control is transferred to `recipient`, care must be * taken to not create reentrancy vulnerabilities. Consider using * {ReentrancyGuard} or the * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern]. */ function sendValue(address payable recipient, uint256 amount) internal { require(address(this).balance >= amount, "Address: insufficient balance"); (bool success, ) = recipient.call{value: amount}(""); require(success, "Address: unable to send value, recipient may have reverted"); } /** * @dev Performs a Solidity function call using a low level `call`. A * plain `call` is an unsafe replacement for a function call: use this * function instead. * * If `target` reverts with a revert reason, it is bubbled up by this * function (like regular Solidity function calls). * * Returns the raw returned data. To convert to the expected return value, * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`]. * * Requirements: * * - `target` must be a contract. * - calling `target` with `data` must not revert. * * _Available since v3.1._ */ function functionCall(address target, bytes memory data) internal returns (bytes memory) { return functionCall(target, data, "Address: low-level call failed"); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with * `errorMessage` as a fallback revert reason when `target` reverts. * * _Available since v3.1._ */ function functionCall( address target, bytes memory data, string memory errorMessage ) internal returns (bytes memory) { return functionCallWithValue(target, data, 0, errorMessage); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], * but also transferring `value` wei to `target`. * * Requirements: * * - the calling contract must have an ETH balance of at least `value`. * - the called Solidity function must be `payable`. * * _Available since v3.1._ */ function functionCallWithValue( address target, bytes memory data, uint256 value ) internal returns (bytes memory) { return functionCallWithValue(target, data, value, "Address: low-level call with value failed"); } /** * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but * with `errorMessage` as a fallback revert reason when `target` reverts. * * _Available since v3.1._ */ function functionCallWithValue( address target, bytes memory data, uint256 value, string memory errorMessage ) internal returns (bytes memory) { require(address(this).balance >= value, "Address: insufficient balance for call"); require(isContract(target), "Address: call to non-contract"); (bool success, bytes memory returndata) = target.call{value: value}(data); return verifyCallResult(success, returndata, errorMessage); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], * but performing a static call. * * _Available since v3.3._ */ function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) { return functionStaticCall(target, data, "Address: low-level static call failed"); } /** * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`], * but performing a static call. * * _Available since v3.3._ */ function functionStaticCall( address target, bytes memory data, string memory errorMessage ) internal view returns (bytes memory) { require(isContract(target), "Address: static call to non-contract"); (bool success, bytes memory returndata) = target.staticcall(data); return verifyCallResult(success, returndata, errorMessage); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], * but performing a delegate call. * * _Available since v3.4._ */ function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) { return functionDelegateCall(target, data, "Address: low-level delegate call failed"); } /** * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`], * but performing a delegate call. * * _Available since v3.4._ */ function functionDelegateCall( address target, bytes memory data, string memory errorMessage ) internal returns (bytes memory) { require(isContract(target), "Address: delegate call to non-contract"); (bool success, bytes memory returndata) = target.delegatecall(data); return verifyCallResult(success, returndata, errorMessage); } /** * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the * revert reason using the provided one. * * _Available since v4.3._ */ function verifyCallResult( bool success, bytes memory returndata, string memory errorMessage ) internal pure returns (bytes memory) { if (success) { return returndata; } else { // Look for revert reason and bubble it up if present if (returndata.length > 0) { // The easiest way to bubble the revert reason is using memory via assembly assembly { let returndata_size := mload(returndata) revert(add(32, returndata), returndata_size) } } else { revert(errorMessage); } } } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.0 (utils/Strings.sol) pragma solidity ^0.8.0; /** * @dev String operations. */ library Strings { bytes16 private constant _HEX_SYMBOLS = "0123456789abcdef"; /** * @dev Converts a `uint256` to its ASCII `string` decimal representation. */ function toString(uint256 value) internal pure returns (string memory) { // Inspired by OraclizeAPI's implementation - MIT licence // https://github.com/oraclize/ethereum-api/blob/b42146b063c7d6ee1358846c198246239e9360e8/oraclizeAPI_0.4.25.sol if (value == 0) { return "0"; } uint256 temp = value; uint256 digits; while (temp != 0) { digits++; temp /= 10; } bytes memory buffer = new bytes(digits); while (value != 0) { digits -= 1; buffer[digits] = bytes1(uint8(48 + uint256(value % 10))); value /= 10; } return string(buffer); } /** * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation. */ function toHexString(uint256 value) internal pure returns (string memory) { if (value == 0) { return "0x00"; } uint256 temp = value; uint256 length = 0; while (temp != 0) { length++; temp >>= 8; } return toHexString(value, length); } /** * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length. */ function toHexString(uint256 value, uint256 length) internal pure returns (string memory) { bytes memory buffer = new bytes(2 * length + 2); buffer[0] = "0"; buffer[1] = "x"; for (uint256 i = 2 * length + 1; i > 1; --i) { buffer[i] = _HEX_SYMBOLS[value & 0xf]; value >>= 4; } require(value == 0, "Strings: hex length insufficient"); return string(buffer); } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.0 (utils/introspection/ERC165.sol) pragma solidity ^0.8.0; import "./IERC165.sol"; /** * @dev Implementation of the {IERC165} interface. * * Contracts that want to implement ERC165 should inherit from this contract and override {supportsInterface} to check * for the additional interface id that will be supported. For example: * * ```solidity * function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) { * return interfaceId == type(MyInterface).interfaceId || super.supportsInterface(interfaceId); * } * ``` * * Alternatively, {ERC165Storage} provides an easier to use but more expensive implementation. */ abstract contract ERC165 is IERC165 { /** * @dev See {IERC165-supportsInterface}. */ function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) { return interfaceId == type(IERC165).interfaceId; } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.0 (utils/introspection/IERC165.sol) pragma solidity ^0.8.0; /** * @dev Interface of the ERC165 standard, as defined in the * https://eips.ethereum.org/EIPS/eip-165[EIP]. * * Implementers can declare support of contract interfaces, which can then be * queried by others ({ERC165Checker}). * * For an implementation, see {ERC165}. */ interface IERC165 { /** * @dev Returns true if this contract implements the interface defined by * `interfaceId`. See the corresponding * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section] * to learn more about how these ids are created. * * This function call must use less than 30 000 gas. */ function supportsInterface(bytes4 interfaceId) external view returns (bool); }
{ "optimizer": { "enabled": true, "runs": 200 }, "outputSelection": { "*": { "*": [ "evm.bytecode", "evm.deployedBytecode", "devdoc", "userdoc", "metadata", "abi" ] } }, "libraries": {} }
Contract Security Audit
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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)
000000000000000000000000000000000000000000000000000000000000c350
-----Decoded View---------------
Arg [0] : _maxTokens (uint256): 50000
-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 000000000000000000000000000000000000000000000000000000000000c350
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