ERC-721
NFT
Overview
Max Total Supply
10,000 FOX
Holders
761
Market
Volume (24H)
N/A
Min Price (24H)
N/A
Max Price (24H)
N/A
Other Info
Token Contract
Balance
2 FOXLoading...
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# | Exchange | Pair | Price | 24H Volume | % Volume |
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Contract Name:
FoxGameNFT
Compiler Version
v0.8.10+commit.fc410830
Optimization Enabled:
Yes with 200 runs
Other Settings:
default evmVersion
Contract Source Code (Solidity Standard Json-Input format)
/* ββββββββ βββββββ βββ βββ βββββββ ββββββ ββββ ββββββββββββ βββββββββββββββββββββββββ ββββββββ βββββββββββββ βββββββββββββ ββββββ βββ βββ ββββββ βββ βββββββββββββββββββββββββββββ ββββββ βββ βββ ββββββ βββ ββββββββββββββββββββββββββββ βββ βββββββββββββ βββ ββββββββββββ ββββββ βββ βββββββββββ βββ βββββββ βββ βββ βββββββ βββ ββββββ βββββββββββ */ // SPDX-License-Identifier: MIT pragma solidity ^0.8.10; import "@openzeppelin/contracts/access/Ownable.sol"; import "@openzeppelin/contracts/security/ReentrancyGuard.sol"; import "@openzeppelin/contracts/token/ERC721/extensions/ERC721Enumerable.sol"; import "./IFoxGameNFTTraits.sol"; import "./IFoxGameCarrot.sol"; import "./IFoxGameNFT.sol"; import "./IFoxGame.sol"; contract FoxGameNFT is IFoxGameNFT, ERC721Enumerable, Ownable, ReentrancyGuard { // Presale status bool public presaleActive; bool public saleActive; // Rarity trait probabilities uint8[][21] private rarities; uint8[][21] private aliases; // Mumber of players minted uint16 public minted; // Maximum players in the game uint16 public constant MAX_TOKENS = 50000; // Number of GEN 0 tokens uint16 public constant MAX_GEN0_TOKENS = 10000; // Maximum mint per transaction (per account during whitelist) uint32 public maxMint = 10; // Time denominator for seeding randomness. uint32 private seedRotationSeconds = 90 days; // External contracts IFoxGameCarrot private immutable foxCarrot; IFoxGame private immutable foxGame; IFoxGameNFTTraits private foxTraits; // GEN 0 mint price uint256 public constant MINT_PRICE = 0.0649 ether; // Mapping of token ID to player traits mapping(uint16 => Traits) private tokenTraits; // Whitelist mint count mapping (address => uint32) public presaleMinted; // Store previous trait combinations to prevent duplicates mapping(uint256 => bool) private knownCombinations; // isApprovedForAll registry mapping(address => bool) private approvedWhitelist; // Events event Mint(string kind, address owner, uint16 tokenId); event PresaleActive(bool active); event SaleActive(bool active); // Initialize constructor(address carrot, address game, address traits) ERC721("FoxGame", "FOX") { foxCarrot = IFoxGameCarrot(carrot); foxGame = IFoxGame(game); foxTraits = IFoxGameNFTTraits(traits); // Precomputed rarity probabilities on chain. // (via walker's alias algorithm) // RABBIT // Fur rarities[0] = [ 153, 153, 255, 102, 77, 230 ]; aliases[0] = [ 2, 2, 0, 2, 3, 3 ]; // Paws rarities[1] = [ 61, 184, 122, 122, 61, 255, 204, 122, 224, 255, 214, 184, 235, 61, 184, 184, 184, 122, 122, 184, 153, 245, 143, 224 ]; aliases[1] = [ 6, 8, 8, 9, 10, 0, 5, 15, 6, 8, 9, 15, 10, 20, 20, 12, 21, 22, 23, 23, 15, 20, 21, 22 ]; // Mouth rarities[2] = [ 191, 77, 191, 255, 38, 115, 204, 153, 191, 38, 64, 115, 77, 115, 128 ]; aliases[2] = [ 3, 3, 3, 0, 7, 7, 3, 6, 7, 10, 8, 13, 14, 10, 13 ]; // Nose rarities[3] = [ 255, 242, 153, 204, 115, 230, 230, 115, 115 ]; aliases[3] = [ 0, 0, 1, 2, 0, 0, 0, 2, 3 ]; // Eyes rarities[4] = [ 77, 255, 128, 77, 153, 153, 153, 77, 153, 230, 77, 77, 77, 204, 179, 230, 77, 179, 128, 179, 153, 230, 77, 77, 102, 77, 153, 153, 204, 77 ]; aliases[4] = [ 3, 0, 1, 2, 13, 13, 13, 13, 14, 14, 18, 19, 20, 3, 13, 20, 24, 14, 17, 18, 19, 20, 25, 25, 21, 24, 25, 26, 26, 28 ]; // Ears rarities[5] = [ 41, 61, 102, 204, 255, 102, 204, 204 ]; aliases[5] = [ 5, 5, 5, 5, 0, 4, 5, 5 ]; // Head rarities[6] = [ 87, 255, 130, 245, 173, 173, 191, 87, 176, 128, 217, 43, 173, 217, 92, 217, 43 ]; aliases[6] = [ 1, 0, 3, 1, 6, 6, 3, 9, 6, 8, 9, 9, 9, 9, 9, 9, 14 ]; // FOX // Tail rarities[7] = [ 255, 153, 204, 102 ]; aliases[7] = [ 0, 0, 0, 1 ]; // Fur rarities[8] = [ 255, 204, 153, 153 ]; aliases[8] = [ 0, 0, 1, 1 ]; // Feet rarities[9] = [ 255, 255, 229, 204, 229, 204, 179, 255, 255, 128 ]; aliases[9] = [ 0, 0, 1, 2, 3, 2, 3, 0, 0, 4 ]; // Neck rarities[10] = [ 255, 204, 204, 204, 127, 102, 51, 255, 255, 26 ]; aliases[10] = [ 0, 0, 1, 0, 2, 0, 1, 0, 0, 4 ]; // Mouth rarities[11] = [ 255, 102, 255, 255, 204, 153, 102, 255, 51, 51, 255, 204, 255, 204, 153, 204, 153, 51, 255, 51 ]; aliases[11] = [ 0, 2, 0, 2, 3, 2, 4, 6, 6, 6, 0, 7, 11, 12, 13, 7, 11, 13, 0, 14 ]; // Eyes rarities[12] = [ 56, 255, 179, 153, 158, 112, 133, 112, 112, 56, 250, 224, 199, 122, 240, 214, 189, 112, 112, 163, 112, 138 ]; aliases[12] = [ 1, 0, 1, 2, 3, 1, 4, 3, 6, 12, 6, 10, 11, 12, 13, 14, 15, 12, 13, 16, 21, 19 ]; // Cunning Score rarities[13] = [ 255, 153, 204, 102 ]; aliases[13] = [ 0, 0, 0, 1 ]; // HUNTER // Clothes rarities[14] = [ 128, 255, 128, 64, 255 ]; aliases[14] = [ 2, 0, 1, 2, 0 ]; // Weapon rarities[15] = [ 255, 153, 204, 102 ]; aliases[15] = [ 0, 0, 0, 1 ]; // Neck rarities[16] = [ 102, 255, 26, 153, 255 ]; aliases[16] = [ 1, 0, 3, 1, 0 ]; // Mouth rarities[17] = [ 255, 229, 179, 179, 89, 179, 217 ]; aliases[17] = [ 0, 0, 0, 6, 6, 6, 1 ]; // Eyes rarities[18] = [ 191, 255, 38, 77, 191, 77, 217, 38, 153, 191, 77, 191, 204, 77, 77 ]; aliases[18] = [ 1, 0, 4, 4, 1, 4, 5, 5, 6, 5, 5, 6, 8, 8, 12 ]; // Hat rarities[19] = [ 191, 38, 89, 255, 191 ]; aliases[19] = [ 3, 4, 4, 0, 3 ]; // Marksman Score rarities[20] = [ 255, 153, 204, 102 ]; aliases[20] = [ 0, 0, 0, 1 ]; } /** * Upload rarity propbabilties. Only used in emergencies. * @param traitTypeId trait name id (0 corresponds to "fur") * @param _rarities walker rarity probailities * @param _aliases walker aliases index */ function uploadTraits(uint8 traitTypeId, uint8[] calldata _rarities, uint8[] calldata _aliases) external onlyOwner { rarities[traitTypeId] = _rarities; aliases[traitTypeId] = _aliases; } /** * Enable Presale. */ function togglePresale() external onlyOwner { presaleActive = !presaleActive; emit PresaleActive(presaleActive); } /** * Enable Sale. */ function toggleSale() external onlyOwner { saleActive = !saleActive; emit PresaleActive(saleActive); } /** * Update the ERC-721 trait contract address. */ function setTraitsContract(address _address) external onlyOwner { foxTraits = IFoxGameNFTTraits(_address); } /** * Set the max mints per account during persale and per tx during public sale */ function setMaxMintAmount(uint32 _maxMint) external onlyOwner { maxMint = _maxMint; } /** * Expose traits to trait contract. */ function getTraits(uint16 tokenId) external view override returns (Traits memory) { return tokenTraits[tokenId]; } /** * Expose maximum GEN 0 tokens. */ function getMaxGEN0Players() external pure override returns (uint16) { return MAX_GEN0_TOKENS; } /** * Internal helper for minting. */ function _mint(uint32 amount, bool stake, uint256 originSeed) internal { Kind kind; uint16[] memory tokenIdsToStake = stake ? new uint16[](amount) : new uint16[](0); uint256 carrotCost; uint256 seed; for (uint32 i = 0; i < amount; i++) { minted++; seed = _reseedWithIndex(originSeed, i); carrotCost += getMintCarrotCost(minted); kind = _generateAndStoreTraits(minted, seed, 0).kind; address recipient = _selectRecipient(seed); if (!stake || recipient != msg.sender) { _safeMint(recipient, minted); } else { tokenIdsToStake[i] = minted; _safeMint(address(foxGame), minted); } emit Mint(kind == Kind.RABBIT ? "RABBIT" : kind == Kind.FOX ? "FOX" : "HUNTER", recipient, minted); } if (carrotCost > 0) { foxCarrot.burn(msg.sender, carrotCost); } if (stake) { foxGame.stakeTokens(msg.sender, tokenIdsToStake); } } /** * Mint your players. * @param amount number of tokens to mint * @param stake mint directly to staking * @param membership wheather user is membership or not * @param seed account seed * @param sig signature */ function presaleMint(uint32 amount, bool stake, bool membership, uint48 expiration, uint256 seed, bytes calldata sig) external payable nonReentrant { require(tx.origin == msg.sender, "eos only"); require(presaleActive, "minting is not active"); require(minted + amount <= MAX_TOKENS, "minted out"); require(expiration > block.timestamp, "signature has expired"); require(membership, "only members allowed"); require(foxGame.isValidSignature(msg.sender, membership, expiration, seed, sig), "invalid signature"); // Require ETH for GEN 0 only if (minted < MAX_GEN0_TOKENS) { require(minted + amount <= MAX_GEN0_TOKENS, "not enough available gen0 mints"); require(amount * MINT_PRICE == msg.value, "invalid payment amount"); } else { require(msg.value == 0, "only carrots required"); } // Allow only 10 per account during presale uint32 claimed = presaleMinted[msg.sender]; require(amount > 0 && amount <= maxMint - claimed, "cannot exceed presale mints"); presaleMinted[msg.sender] = claimed + amount; _mint(amount, stake, seed); } /** * Mint your players. * @param amount number of tokens to mint * @param stake mint directly to staking * @param seed random seed per mint * @param sig signature */ function mint(uint32 amount, bool stake, uint256 seed, uint48 expiration, bytes calldata sig) external payable nonReentrant { require(tx.origin == msg.sender, "eos only"); require(saleActive, "minting is not active"); require(amount > 0 && amount <= maxMint, "invalid mint amount"); require(amount * MINT_PRICE == msg.value, "Invalid payment amount"); require(minted + amount <= MAX_TOKENS, "minted out"); require(expiration > block.timestamp, "signature has expired"); require(foxGame.isValidSignature(msg.sender, false, expiration, seed, sig), "invalid signature"); _mint(amount, stake, seed); } /** * Calculate the foxCarrot cost: * - the first 20% are paid in ETH * - the next 20% are 20000 $CARROT * - the next 40% are 40000 $CARROT * - the final 20% are 80000 $CARROT * @param tokenId the ID to check the cost of to mint * @return the cost of the given token ID */ function getMintCarrotCost(uint16 tokenId) public pure returns (uint256) { if (tokenId <= MAX_GEN0_TOKENS) return 0; if (tokenId <= MAX_TOKENS * 2 / 5) return 20000 ether; if (tokenId <= MAX_TOKENS * 4 / 5) return 40000 ether; return 80000 ether; } /** * Generate and store player traits. Recursively called to ensure uniqueness. * Give users 3 attempts, bit shifting the seed each time (uses 5 bytes of entropy before failing) * @param tokenId id of the token to generate traits * @param seed random 256 bit seed to derive traits * @return t player trait struct */ function _generateAndStoreTraits(uint16 tokenId, uint256 seed, uint8 attempt) internal returns (Traits memory t) { require(attempt < 6, "unable to generate unique traits"); t = _selectTraits(tokenId, seed); if (!knownCombinations[_structToHash(t)]) { tokenTraits[tokenId] = t; knownCombinations[_structToHash(t)] = true; return t; } return _generateAndStoreTraits(tokenId, seed >> attempt, attempt + 1); } /** * 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); if (seed >> 8 < rarities[traitType][trait]) return trait; return aliases[traitType][trait]; } /** * the first 20% (ETH purchases) go to the minter * the remaining 80% have a 10% chance to be given to a random staked fox * @param seed a random value to select a recipient from * @return the address of the recipient (either the minter or the fox thief's owner) */ function _selectRecipient(uint256 seed) internal view returns (address) { if (minted <= MAX_GEN0_TOKENS || ((seed >> 245) % 10) != 0) { return msg.sender; // top 10 bits haven't been used } // 144 bits reserved for trait selection address thief = foxGame.randomFoxOwner(seed >> 144); if (thief == address(0x0)) { return msg.sender; } return thief; } /** * 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 struct of randomly selected traits */ function _selectTraits(uint16 tokenId, uint256 seed) internal view returns (Traits memory t) { // No Hunters until GEN 1 (RABBIT=0, FOX=1, HUNTER=2) if (tokenId <= MAX_GEN0_TOKENS) { t.kind = Kind((seed & 0xFFFF) % 10 == 0 ? 1 : 0); } else { uint mod = (seed & 0xFFFF) % 50; t.kind = Kind(mod == 0 ? 2 : mod < 5 ? 1 : 0); } // Use 128 bytes of seed entropy to define traits. uint8 offset = uint8(t.kind) * 7; // RABBIT FOX HUNTER seed >>= 16; t.traits[0] = _selectTrait(uint16(seed & 0xFFFF), 0 + offset); // Fur Tail Clothes seed >>= 16; t.traits[1] = _selectTrait(uint16(seed & 0xFFFF), 1 + offset); // Head Fur Eyes seed >>= 16; t.traits[2] = _selectTrait(uint16(seed & 0xFFFF), 2 + offset); // Ears Eyes Hat seed >>= 16; t.traits[3] = _selectTrait(uint16(seed & 0xFFFF), 3 + offset); // Eyes Mouth Mouth seed >>= 16; t.traits[4] = _selectTrait(uint16(seed & 0xFFFF), 4 + offset); // Nose Neck Neck seed >>= 16; t.traits[5] = _selectTrait(uint16(seed & 0xFFFF), 5 + offset); // Mouth Feet Weapon seed >>= 16; t.traits[6] = _selectTrait(uint16(seed & 0xFFFF), 6 + offset); // Paws Cunning Marksman t.advantage = t.traits[6]; } /** * converts a struct to a 256 bit hash to check for uniqueness * @param t the struct to pack into a hash * @return the 256 bit hash of the struct */ function _structToHash(Traits memory t) internal pure returns (uint256) { return uint256(bytes32( abi.encodePacked( t.kind, t.advantage, t.traits[0], t.traits[1], t.traits[2], t.traits[3], t.traits[4], t.traits[5], t.traits[6] ) )); } /** * Reseeds entropy with mint amount offset. * @param seed random seed * @param offset additional entropy during mint * @return rotated seed */ function _reseedWithIndex(uint256 seed, uint32 offset) internal pure returns (uint256) { return uint256(keccak256(abi.encodePacked(seed, offset))); } /** * Allow private sales. */ function mintToAddress(uint256 amount, address recipient, uint256 originSeed) external onlyOwner { require(minted + amount <= MAX_TOKENS, "minted out"); require(amount > 0, "invalid mint amount"); Kind kind; uint256 seed; for (uint32 i = 0; i < amount; i++) { minted++; seed = _reseedWithIndex(originSeed, i); kind = _generateAndStoreTraits(minted, seed, 0).kind; _safeMint(recipient, minted); emit Mint(kind == Kind.RABBIT ? "RABBIT" : kind == Kind.FOX ? "FOX" : "HUNTER", recipient, minted); } } /** * Allows owner to withdraw funds from minting. */ function withdraw() external onlyOwner { payable(owner()).transfer(address(this).balance); } /** * Override transfer to avoid the approval step during staking. */ function transferFrom(address from, address to, uint256 tokenId) public override(ERC721, IFoxGameNFT) { if (msg.sender != address(foxGame)) { require(_isApprovedOrOwner(msg.sender, tokenId), "transfer not owner nor approved"); } _transfer(from, to, tokenId); } /** * Override NFT token uri. Calls into traits contract. */ function tokenURI(uint256 tokenId) public view override returns (string memory) { require(_exists(tokenId), "nonexistent token"); return foxTraits.tokenURI(uint16(tokenId)); } /** * Ennumerate tokens by owner. */ function tokensOf(address owner) external view returns (uint16[] memory) { uint32 tokenCount = uint32(balanceOf(owner)); uint16[] memory tokensId = new uint16[](tokenCount); for (uint32 i = 0; i < tokenCount; i++){ tokensId[i] = uint16(tokenOfOwnerByIndex(owner, i)); } return tokensId; } /** * Overridden to resolve multiple inherited interfaces. */ function ownerOf(uint256 tokenId) public view override(ERC721, IFoxGameNFT) returns (address) { return super.ownerOf(tokenId); } /** * Overridden to resolve multiple inherited interfaces. */ function safeTransferFrom(address from, address to, uint256 tokenId, bytes memory _data) public override(ERC721, IFoxGameNFT) { super.safeTransferFrom(from, to, tokenId, _data); } }
// SPDX-License-Identifier: MIT 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() { _setOwner(_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 { _setOwner(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"); _setOwner(newOwner); } function _setOwner(address newOwner) private { address oldOwner = _owner; _owner = newOwner; emit OwnershipTransferred(oldOwner, newOwner); } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; /** * @dev Contract module that helps prevent reentrant calls to a function. * * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier * available, which can be applied to functions to make sure there are no nested * (reentrant) calls to them. * * Note that because there is a single `nonReentrant` guard, functions marked as * `nonReentrant` may not call one another. This can be worked around by making * those functions `private`, and then adding `external` `nonReentrant` entry * points to them. * * TIP: If you would like to learn more about reentrancy and alternative ways * to protect against it, check out our blog post * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul]. */ abstract contract ReentrancyGuard { // Booleans are more expensive than uint256 or any type that takes up a full // word because each write operation emits an extra SLOAD to first read the // slot's contents, replace the bits taken up by the boolean, and then write // back. This is the compiler's defense against contract upgrades and // pointer aliasing, and it cannot be disabled. // The values being non-zero value makes deployment a bit more expensive, // but in exchange the refund on every call to nonReentrant will be lower in // amount. Since refunds are capped to a percentage of the total // transaction's gas, it is best to keep them low in cases like this one, to // increase the likelihood of the full refund coming into effect. uint256 private constant _NOT_ENTERED = 1; uint256 private constant _ENTERED = 2; uint256 private _status; constructor() { _status = _NOT_ENTERED; } /** * @dev Prevents a contract from calling itself, directly or indirectly. * Calling a `nonReentrant` function from another `nonReentrant` * function is not supported. It is possible to prevent this from happening * by making the `nonReentrant` function external, and make it call a * `private` function that does the actual work. */ modifier nonReentrant() { // On the first call to nonReentrant, _notEntered will be true require(_status != _ENTERED, "ReentrancyGuard: reentrant call"); // Any calls to nonReentrant after this point will fail _status = _ENTERED; _; // By storing the original value once again, a refund is triggered (see // https://eips.ethereum.org/EIPS/eip-2200) _status = _NOT_ENTERED; } }
// SPDX-License-Identifier: MIT 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(); } }
/* ββββββββ βββββββ βββ βββ βββββββ ββββββ ββββ ββββββββββββ βββββββββββββββββββββββββ ββββββββ βββββββββββββ βββββββββββββ ββββββ βββ βββ ββββββ βββ βββββββββββββββββββββββββββββ ββββββ βββ βββ ββββββ βββ ββββββββββββββββββββββββββββ βββ βββββββββββββ βββ ββββββββββββ ββββββ βββ βββββββββββ βββ βββββββ βββ βββ βββββββ βββ ββββββ βββββββββββ */ // SPDX-License-Identifier: MIT pragma solidity ^0.8.10; interface IFoxGameNFTTraits { function tokenURI(uint16 tokenId) external view returns (string memory); }
/* ββββββββ βββββββ βββ βββ βββββββ ββββββ ββββ ββββββββββββ βββββββββββββββββββββββββ ββββββββ βββββββββββββ βββββββββββββ ββββββ βββ βββ ββββββ βββ βββββββββββββββββββββββββββββ ββββββ βββ βββ ββββββ βββ ββββββββββββββββββββββββββββ βββ βββββββββββββ βββ ββββββββββββ ββββββ βββ βββββββββββ βββ βββββββ βββ βββ βββββββ βββ ββββββ βββββββββββ */ // SPDX-License-Identifier: MIT pragma solidity ^0.8.10; interface IFoxGameCarrot { function mint(address to, uint256 amount) external; function burn(address from, uint256 amount) external; }
/* ββββββββ βββββββ βββ βββ βββββββ ββββββ ββββ ββββββββββββ βββββββββββββββββββββββββ ββββββββ βββββββββββββ βββββββββββββ ββββββ βββ βββ ββββββ βββ βββββββββββββββββββββββββββββ ββββββ βββ βββ ββββββ βββ ββββββββββββββββββββββββββββ βββ βββββββββββββ βββ ββββββββββββ ββββββ βββ βββββββββββ βββ βββββββ βββ βββ βββββββ βββ ββββββ βββββββββββ */ // SPDX-License-Identifier: MIT pragma solidity ^0.8.10; interface IFoxGameNFT { enum Kind { RABBIT, FOX, HUNTER } struct Traits { Kind kind; uint8 advantage; uint8[7] traits; } function getMaxGEN0Players() external pure returns (uint16); function getTraits(uint16) external view returns (Traits memory); function ownerOf(uint256) external view returns (address owner); function transferFrom(address, address, uint256) external; function safeTransferFrom(address, address, uint256, bytes memory) external; }
/* ββββββββ βββββββ βββ βββ βββββββ ββββββ ββββ ββββββββββββ βββββββββββββββββββββββββ ββββββββ βββββββββββββ βββββββββββββ ββββββ βββ βββ ββββββ βββ βββββββββββββββββββββββββββββ ββββββ βββ βββ ββββββ βββ ββββββββββββββββββββββββββββ βββ βββββββββββββ βββ ββββββββββββ ββββββ βββ βββββββββββ βββ βββββββ βββ βββ βββββββ βββ ββββββ βββββββββββ */ // SPDX-License-Identifier: MIT pragma solidity ^0.8.10; interface IFoxGame { function stakeTokens(address, uint16[] calldata) external; function randomFoxOwner(uint256) external view returns (address); function isValidSignature(address, bool, uint48, uint256, bytes memory) external view returns (bool); }
// SPDX-License-Identifier: MIT 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 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 { require(operator != _msgSender(), "ERC721: approve to caller"); _operatorApprovals[_msgSender()][operator] = approved; emit ApprovalForAll(_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 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 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 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 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 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 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 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 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 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
- No Contract Security Audit Submitted- Submit Audit Here
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IFoxGameNFT.Kind","name":"kind","type":"uint8"},{"internalType":"uint8","name":"advantage","type":"uint8"},{"internalType":"uint8[7]","name":"traits","type":"uint8[7]"}],"internalType":"struct IFoxGameNFT.Traits","name":"","type":"tuple"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"owner","type":"address"},{"internalType":"address","name":"operator","type":"address"}],"name":"isApprovedForAll","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"maxMint","outputs":[{"internalType":"uint32","name":"","type":"uint32"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint32","name":"amount","type":"uint32"},{"internalType":"bool","name":"stake","type":"bool"},{"internalType":"uint256","name":"seed","type":"uint256"},{"internalType":"uint48","name":"expiration","type":"uint48"},{"internalType":"bytes","name":"sig","type":"bytes"}],"name":"mint","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"address","name":"recipient","type":"address"},{"internalType":"uint256","name":"originSeed","type":"uint256"}],"name":"mintToAddress","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"minted","outputs":[{"internalType":"uint16","name":"","type":"uint16"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"name","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"ownerOf","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"presaleActive","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint32","name":"amount","type":"uint32"},{"internalType":"bool","name":"stake","type":"bool"},{"internalType":"bool","name":"membership","type":"bool"},{"internalType":"uint48","name":"expiration","type":"uint48"},{"internalType":"uint256","name":"seed","type":"uint256"},{"internalType":"bytes","name":"sig","type":"bytes"}],"name":"presaleMint","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"presaleMinted","outputs":[{"internalType":"uint32","name":"","type":"uint32"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"safeTransferFrom","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"},{"internalType":"bytes","name":"_data","type":"bytes"}],"name":"safeTransferFrom","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"saleActive","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"operator","type":"address"},{"internalType":"bool","name":"approved","type":"bool"}],"name":"setApprovalForAll","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint32","name":"_maxMint","type":"uint32"}],"name":"setMaxMintAmount","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_address","type":"address"}],"name":"setTraitsContract","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes4","name":"interfaceId","type":"bytes4"}],"name":"supportsInterface","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"symbol","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"togglePresale","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"toggleSale","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"index","type":"uint256"}],"name":"tokenByIndex","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"owner","type":"address"},{"internalType":"uint256","name":"index","type":"uint256"}],"name":"tokenOfOwnerByIndex","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"tokenURI","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"owner","type":"address"}],"name":"tokensOf","outputs":[{"internalType":"uint16[]","name":"","type":"uint16[]"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalSupply","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"transferFrom","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint8","name":"traitTypeId","type":"uint8"},{"internalType":"uint8[]","name":"_rarities","type":"uint8[]"},{"internalType":"uint8[]","name":"_aliases","type":"uint8[]"}],"name":"uploadTraits","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"withdraw","outputs":[],"stateMutability":"nonpayable","type":"function"}]
Contract Creation Code
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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)
0000000000000000000000002983d9c9d9702757657f02e289b2b5a3a22572b600000000000000000000000025be71572ddf57ff57de4744f27a83d15f083303000000000000000000000000159b8fe52cf781872c61273e9b8892913721aada
-----Decoded View---------------
Arg [0] : carrot (address): 0x2983D9C9d9702757657F02E289b2b5a3a22572b6
Arg [1] : game (address): 0x25Be71572dDf57FF57de4744F27a83D15f083303
Arg [2] : traits (address): 0x159B8fe52CF781872C61273E9b8892913721Aada
-----Encoded View---------------
3 Constructor Arguments found :
Arg [0] : 0000000000000000000000002983d9c9d9702757657f02e289b2b5a3a22572b6
Arg [1] : 00000000000000000000000025be71572ddf57ff57de4744f27a83d15f083303
Arg [2] : 000000000000000000000000159b8fe52cf781872c61273e9b8892913721aada
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