ERC-721
Overview
Max Total Supply
1,822 VGAME
Holders
657
Market
Volume (24H)
N/A
Min Price (24H)
N/A
Max Price (24H)
N/A
Other Info
Token Contract
Balance
2 VGAMELoading...
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# | Exchange | Pair | Price | 24H Volume | % Volume |
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Contract Name:
VampireGame
Compiler Version
v0.8.7+commit.e28d00a7
Optimization Enabled:
Yes with 200 runs
Other Settings:
default evmVersion
Contract Source Code (Solidity Standard Json-Input format)
// SPDX-License-Identifier: MIT pragma solidity ^0.8.6; import "@openzeppelin/contracts/token/ERC20/IERC20.sol"; import "@openzeppelin/contracts/token/ERC721/extensions/ERC721Enumerable.sol"; import "@openzeppelin/contracts/access/Ownable.sol"; import "@openzeppelin/contracts/security/ReentrancyGuard.sol"; import "@openzeppelin/contracts/utils/Arrays.sol"; import "@chainlink/contracts/src/v0.8/VRFConsumerBase.sol"; import "./allowlist/AllowList.sol"; import "./traits/TokenTraits.sol"; import "./traits/ITraits.sol"; import "./IVampireGame.sol"; /// @title The Vampire Game NFT contract /// /// Note: The original Wolf Game's contract was used as insipiration, and a /// few parts of the contract were taken directly, in particular the trait selection /// and rarity using Walker's Alias method, and using a separate `Traits` contract /// for getting the tokenURI. /// /// Some info about how this contract works: /// /// ### Allow-list /// /// Using a merkle-tree based allow-list that caps the amount of nfts a wallet /// can mint. This increases a bit the gas cost to mint on **presale**, but we /// compensate this by paying half of the minting price when we reveal the NFTs. /// /// ### On-chain vs Off-chain /// /// What is on-chain here? /// - The generated traits /// - The revealed traits metadata /// - The traits img data /// /// What is off-chain? /// - The random number we get for batch reveals. We use a neutral, trusted third party /// that is widely known in the community: Chainlink VRF. /// - The non-revealed traits metadata (before your nft is revealed). /// /// ### Minting and Revealing /// /// 1. The user mints an NFT /// 2. After a few mints, we request a random number to Chainlink VRF /// 3. We use this random number to reveal the batch of NFTs that were minted /// before we got the seed. /// /// Why? We believe that as long as minting and revealing happens in the same /// transaction, people will be able to cheat. /// /// ### Traits /// /// The traits are all stored on-chain in another contract "Traits" similar to Wolf Game. /// /// ### Game Controllers /// /// For us to be able to expand on this game, future "game controller" contracts will be /// able to freely call `mint` functions, and `transferFrom`, the logic to safeguard /// those functions will be delegated to those contracts. /// /// Unfortunatelly, to be able to expand, and to not fall into traps like Wolf Game did, /// we had to leave a few things open that requires our users to _trust us_ for now. We /// hope to make this trustless some day. /// contract VampireGame is IVampireGame, IVampireGameControls, ERC721Enumerable, AllowList, Ownable, ReentrancyGuard, VRFConsumerBase { /// @notice used to find seeds for token ids using Arrays for uint256[]; /// ==== Immutable // Most of the immutable variables are initiated in the constructor // to make it easier to test /// @notice minting price in wei uint256 public immutable MINT_PRICE; /// @notice max amount of tokens that can be minted uint256 public immutable MAX_SUPPLY; /// @notice max mints per address uint256 public immutable MAX_PER_ADDRESS; /// @notice max mints per address in presale uint256 public immutable MAX_PER_ADDRESS_PRESALE; /// @notice price in $LINK to make VRF requests uint256 public LINK_VRF_PRICE; /// @notice number of tokens that can be bought with ether uint256 public PAID_TOKENS; /// @notice size of the batch that will be revealed by a single uint256 public SEED_BATCH_SIZE; /// @notice random numbers generated from Chainlink VRF. uint256[] public seeds; /// @notice array of tokenIds in ascending order that matches the length of the `seeds` array. /// @dev using this to set which seeds are for which token, for example if let's say /// the array has the values [100, 1000], then tokens from 0~99 will use seed[0] and /// tokens from 100~999 will use seed[1]. uint256[] public seedTokenBoundaries; /// @notice mapping from tokenId to tokenTraits mapping(uint256 => TokenTraits) public tokenTraits; /// @notice mapping from token hash to tokenId to prevent duplicated traits mapping(uint256 => uint256) public existingCombinations; /// @notice mapping from address to amount of tokens minted mapping(address => uint8) public amountMintedByAddress; /// @notice game controllers they can access special functions mapping(address => bool) public controllers; /// @notice chainlink key hash bytes32 public immutable KEY_HASH; /// @notice LINK token IERC20 public immutable LINK_TOKEN; /// @notice contract storing the traits data ITraits public traits; /// @notice address to withdraw the eth address private immutable splitter; /// @notice controls if mintWithEthPresale is paused bool public mintWithEthPresalePaused = true; /// @notice controls if mintWithEth is paused bool public mintWithEthPaused = true; /// @notice controls if mintFromController is paused bool public mintFromControllerPaused = true; /// @notice controls if token reveal is paused bool public revealPaused = true; /// @notice list of probabilities for each trait type 0 - 9 are associated with Sheep, 10 - 18 are associated with Wolves /// @dev won't mutate but can't make it immutable uint8[][18] public RARITIES; /// @notice list of aliases for Walker's Alias algorithm 0 - 9 are associated with Sheep, 10 - 18 are associated with Wolves /// @dev won't mutate but can't make it immutable uint8[][18] public ALIASES; /// === Constructor /// @dev constructor, most of the immutable props can be set here so it's easier to test /// @param _LINK_KEY_HASH Chainlink's VRF Key Hash /// @param _LINK_ADDRESS Chainlink's LINK contract address /// @param _LINK_VRF_COORDINATOR_ADDRESS Chainlink's coordinator contract address /// @param _LINK_VRF_PRICE Price in $LINK to request a random number from Chainlink VRF /// @param _MINT_PRICE price to mint one token in wei /// @param _MAX_SUPPLY maximum amount of available tokens to mint /// @param _MAX_PER_ADDRESS maximum amount of tokens one address can mint /// @param _MAX_PER_ADDRESS_PRESALE maximum amount of tokens one address can mint /// @param _SEED_BATCH_SIZE amount of tokens revealed by one seed /// @param _PAID_TOKENS maxiumum amount of tokens that can be bought with eth /// @param _splitter address to where the funds will go constructor( bytes32 _LINK_KEY_HASH, address _LINK_ADDRESS, address _LINK_VRF_COORDINATOR_ADDRESS, uint256 _LINK_VRF_PRICE, uint256 _MINT_PRICE, uint256 _MAX_SUPPLY, uint256 _MAX_PER_ADDRESS, uint256 _MAX_PER_ADDRESS_PRESALE, uint256 _SEED_BATCH_SIZE, uint256 _PAID_TOKENS, address _splitter ) VRFConsumerBase(_LINK_VRF_COORDINATOR_ADDRESS, _LINK_ADDRESS) ERC721("The Vampire Game", "VGAME") { LINK_TOKEN = IERC20(_LINK_ADDRESS); KEY_HASH = _LINK_KEY_HASH; LINK_VRF_PRICE = _LINK_VRF_PRICE; MINT_PRICE = _MINT_PRICE; MAX_SUPPLY = _MAX_SUPPLY; MAX_PER_ADDRESS = _MAX_PER_ADDRESS; MAX_PER_ADDRESS_PRESALE = _MAX_PER_ADDRESS_PRESALE; SEED_BATCH_SIZE = _SEED_BATCH_SIZE; PAID_TOKENS = _PAID_TOKENS; splitter = _splitter; // Humans // Skin RARITIES[0] = [50, 15, 15, 250, 255]; ALIASES[0] = [3, 4, 4, 0, 3]; // Face RARITIES[1] = [ 133, 189, 57, 255, 243, 133, 114, 135, 168, 38, 222, 57, 95, 57, 152, 114, 57, 133, 189 ]; ALIASES[1] = [ 1, 0, 3, 1, 3, 3, 3, 4, 7, 4, 8, 4, 8, 10, 10, 10, 18, 18, 14 ]; // T-Shirt RARITIES[2] = [ 181, 224, 147, 236, 220, 168, 160, 84, 173, 224, 221, 254, 140, 252, 224, 250, 100, 207, 84, 252, 196, 140, 228, 140, 255, 183, 241, 140 ]; ALIASES[2] = [ 1, 0, 3, 1, 3, 3, 4, 11, 11, 4, 9, 10, 13, 11, 13, 14, 15, 15, 20, 17, 19, 24, 20, 24, 22, 26, 24, 26 ]; // Pants RARITIES[3] = [ 126, 171, 225, 240, 227, 112, 255, 240, 217, 80, 64, 160, 228, 80, 64, 167 ]; ALIASES[3] = [2, 0, 1, 2, 3, 3, 4, 6, 7, 4, 6, 7, 8, 8, 15, 12]; // Boots RARITIES[4] = [150, 30, 60, 255, 150, 60]; ALIASES[4] = [0, 3, 3, 0, 3, 4]; // Accessory RARITIES[5] = [ 210, 135, 80, 245, 235, 110, 80, 100, 190, 100, 255, 160, 215, 80, 100, 185, 250, 240, 240, 100 ]; ALIASES[5] = [ 0, 0, 3, 0, 3, 4, 10, 12, 4, 16, 8, 16, 10, 17, 18, 12, 15, 16, 17, 18 ]; // Hair RARITIES[6] = [250, 115, 100, 40, 175, 255, 180, 100, 175, 185]; ALIASES[6] = [0, 0, 4, 6, 0, 4, 5, 9, 6, 8]; // Cape RARITIES[7] = [255]; ALIASES[7] = [0]; // predatorIndex RARITIES[8] = [255]; ALIASES[8] = [0]; // Vampires // Skin RARITIES[9] = [ 234, 239, 234, 234, 255, 234, 244, 249, 130, 234, 234, 247, 234 ]; ALIASES[9] = [0, 0, 1, 2, 3, 4, 5, 6, 12, 7, 9, 10, 11]; // Face RARITIES[10] = [ 45, 255, 165, 60, 195, 195, 45, 120, 75, 75, 105, 120, 255, 180, 150 ]; ALIASES[10] = [1, 0, 1, 4, 2, 4, 5, 12, 12, 13, 13, 14, 5, 12, 13]; // Clothes RARITIES[11] = [ 147, 180, 246, 201, 210, 252, 219, 189, 195, 156, 177, 171, 165, 225, 135, 135, 186, 135, 150, 243, 135, 255, 231, 141, 183, 150, 135 ]; ALIASES[11] = [ 2, 2, 0, 2, 3, 4, 5, 6, 7, 3, 3, 4, 4, 8, 5, 6, 13, 13, 19, 16, 19, 19, 21, 21, 21, 21, 22 ]; // Pants RARITIES[12] = [255]; ALIASES[12] = [0]; // Boots RARITIES[13] = [255]; ALIASES[13] = [0]; // Accessory RARITIES[14] = [255]; ALIASES[14] = [0]; // Hair RARITIES[15] = [255]; ALIASES[15] = [0]; // Cape RARITIES[16] = [9, 9, 150, 90, 9, 210, 9, 9, 255]; ALIASES[16] = [5, 5, 0, 2, 8, 3, 8, 8, 5]; // predatorIndex RARITIES[17] = [255, 8, 160, 73]; ALIASES[17] = [0, 0, 0, 2]; } /// ==== Modifiers modifier onlyControllers() { require(controllers[_msgSender()], "ONLY_CONTROLLERS"); _; } /// ==== Minting /// @notice mint an unrevealed token using eth /// @param amount amount to mint function mintWithETH(uint8 amount) external payable nonReentrant { require(!mintWithEthPaused, "MINT_WITH_ETH_PAUSED"); uint8 addressMintedSoFar = amountMintedByAddress[_msgSender()]; require( addressMintedSoFar + amount <= MAX_PER_ADDRESS, "MAX_TOKEN_PER_WALLET" ); require(totalSupply() + amount <= PAID_TOKENS, "NOT_ENOUGH_TOKENS"); require(amount > 0, "INVALID_AMOUNT"); require(amount * MINT_PRICE == msg.value, "WRONG_VALUE"); amountMintedByAddress[_msgSender()] = addressMintedSoFar + amount; _mintMany(_msgSender(), amount); } /// @notice mint an unrevealed token using eth /// @param amount amount to mint function mintWithETHPresale(uint8 amount, bytes32[] calldata proof) external payable nonReentrant { require(!mintWithEthPresalePaused, "PRESALE_PAUSED"); require(isAddressInAllowList(_msgSender(), proof), "NOT_IN_ALLOWLIST"); uint8 addressMintedSoFar = amountMintedByAddress[_msgSender()]; require( addressMintedSoFar + amount <= MAX_PER_ADDRESS_PRESALE, "MAX_TOKEN_PER_WALLET" ); require(totalSupply() + amount <= PAID_TOKENS, "NOT_ENOUGH_TOKENS"); require(amount > 0, "INVALID_AMOUNT"); require(amount * MINT_PRICE == msg.value, "WRONG_VALUE"); amountMintedByAddress[_msgSender()] = addressMintedSoFar + amount; _mintMany(_msgSender(), amount); } /// @dev mint any amount of tokens to an address /// common logic to many functions, the function calling /// this should do the guard checks function _mintMany(address to, uint8 amount) private { uint256 supply = totalSupply(); for (uint8 i = 0; i < amount; i++) { uint256 tokenId = supply + i; _safeMint(to, tokenId); if ((tokenId + 1) % SEED_BATCH_SIZE == 0) { requestRandomness(KEY_HASH, LINK_VRF_PRICE); } } } /// ==== Revealing /// @notice reveal the metadata of multiple of tokenIds. /// @dev admin check if this won't fail function revealGenZeroTokens(uint256[] calldata tokenIds) external onlyOwner { for (uint256 i = 0; i < tokenIds.length; i++) { uint256 tokenId = tokenIds[i]; require(canRevealToken(tokenId), "CANT_REVEAL"); // Find seed index in the seedTokenBoundaries array uint256 seedIndex = seedTokenBoundaries.findUpperBound(tokenId); uint256 seed = uint256(keccak256(abi.encode(seeds[seedIndex], tokenId))); _revealToken(tokenId, seed); } } /// @dev returns true if a token can be revealed. /// Conditions for a token to be revealed: /// - Was not revealed yet /// - There is a seed that was added after the was already minted function canRevealToken(uint256 tokenId) private view returns (bool) { // Token already revealed if (tokenTraits[tokenId].exists) { return false; } // No seeds if (seedTokenBoundaries.length == 0) { return false; } // If the last element of the seedTokenBoundaries array is greater // than the tokenId it means that there is a seed available for that // token so the token can be revealed return seedTokenBoundaries[seedTokenBoundaries.length - 1] > tokenId; } /// @dev reveal one token given an id and a seed function _revealToken(uint256 tokenId, uint256 seed) private { ( TokenTraits memory tt, uint256 ttHash ) = _generateNonDuplicatedTokenTraits(tokenId, seed); tokenTraits[tokenId] = tt; existingCombinations[ttHash] = tokenId; } /// @dev recursive function to generate a TokenTraits without colliding /// with other previously generated traits. It uses a seed from /// Chainlink VRF and if there is a collision, it keeps re-hashing the /// seed with the tokenId until it finds a unique set of traits. /// @param tokenId the id of the token to generate the traits for /// @param seed a value derived from a randomly generated value /// @return tt a TokenTraits struct function _generateNonDuplicatedTokenTraits(uint256 tokenId, uint256 seed) private returns (TokenTraits memory tt, uint256 ttHash) { // generate traits from seed tt = selectTraits(seed); // hash to check if the token is unique ttHash = structToHash(tt); if (existingCombinations[ttHash] == 0) { tokenTraits[tokenId] = tt; existingCombinations[ttHash] = tokenId; return (tt, ttHash); } // If it's here, then the generated traits collided with another // set of traits. Hopefully this won't happen. // generates a new seed combining the current seed and the tokenId uint256 newSeed = uint256(keccak256(abi.encode(seed, tokenId))); // recursive call D: return _generateNonDuplicatedTokenTraits(tokenId, newSeed); } /// @dev select traits based on the seed value. /// @param seed a uint256 to derive traits from /// @return tt the TokenTraits function selectTraits(uint256 seed) private view returns (TokenTraits memory tt) { tt.exists = true; tt.isVampire = (seed & 0xFFFF) % 10 == 0; uint8 shift = tt.isVampire ? 9 : 0; seed >>= 16; tt.skin = selectTrait(uint16(seed & 0xFFFF), 0 + shift); seed >>= 16; tt.face = selectTrait(uint16(seed & 0xFFFF), 1 + shift); seed >>= 16; tt.clothes = selectTrait(uint16(seed & 0xFFFF), 2 + shift); seed >>= 16; tt.pants = selectTrait(uint16(seed & 0xFFFF), 3 + shift); seed >>= 16; tt.boots = selectTrait(uint16(seed & 0xFFFF), 4 + shift); seed >>= 16; tt.accessory = selectTrait(uint16(seed & 0xFFFF), 5 + shift); seed >>= 16; tt.hair = selectTrait(uint16(seed & 0xFFFF), 6 + shift); seed >>= 16; tt.cape = selectTrait(uint16(seed & 0xFFFF), 7 + shift); seed >>= 16; tt.predatorIndex = selectTrait(uint16(seed & 0xFFFF), 8 + shift); } /// @dev select a trait from the traitType /// @param seed a uint256 number to get the trait value from /// @param traitType the trait type function selectTrait(uint16 seed, uint8 traitType) private view returns (uint8) { uint8 trait = uint8(seed) % uint8(RARITIES[traitType].length); if (seed >> 8 < RARITIES[traitType][trait]) return trait; return ALIASES[traitType][trait]; } /// @dev hash a TokenTraits struct /// @param tt the TokenTraits struct /// @return the uint256 hash function structToHash(TokenTraits memory tt) private pure returns (uint256) { return uint256( bytes32( abi.encodePacked( tt.isVampire, tt.skin, tt.face, tt.clothes, tt.pants, tt.boots, tt.accessory, tt.hair, tt.cape, tt.predatorIndex ) ) ); } /// ==== State Control /// @notice set the new merkle tree root for allow-list function setMerkleTreeRoot(bytes32 newMerkleTreeRoot) external onlyOwner { _setMerkleTreeRoot(newMerkleTreeRoot); } /// @notice set the max amount of gen 0 tokens function setPaidTokens(uint256 _PAID_TOKENS) external onlyOwner { require(PAID_TOKENS != _PAID_TOKENS, "NO_CHANGES"); PAID_TOKENS = _PAID_TOKENS; } /// @notice pause/unpause mintWithEthPresale function function setMintWithEthPresalePaused(bool paused) external onlyOwner { require(paused != mintWithEthPresalePaused, "NO_CHANGES"); mintWithEthPresalePaused = paused; } /// @notice pause/unpause mintWithEth function function setMintWithEthPaused(bool paused) external onlyOwner { require(paused != mintWithEthPaused, "NO_CHANGES"); mintWithEthPaused = paused; } /// @notice pause/unpause mintFromController function function setMintFromControllerPaused(bool paused) external onlyOwner { require(paused != mintFromControllerPaused, "NO_CHANGES"); mintFromControllerPaused = paused; } /// @notice pause/unpause token reveal functions function setRevealPaused(bool paused) external onlyOwner { require(paused != revealPaused, "NO_CHANGES"); revealPaused = paused; } /// @notice set the contract for the traits rendering /// @param _traits the contract address function setTraits(address _traits) external onlyOwner { traits = ITraits(_traits); } /// @notice add controller authority to an address /// @param _controller address to the game controller function addController(address _controller) external onlyOwner { controllers[_controller] = true; } /// @notice remove controller authority from an address /// @param _controller address to the game controller function removeController(address _controller) external onlyOwner { controllers[_controller] = false; } /// ==== Withdraw /// @notice withdraw the ether from the contract function withdraw() external onlyOwner { uint256 contractBalance = address(this).balance; // solhint-disable-next-line avoid-low-level-calls (bool sent, ) = splitter.call{value: contractBalance}(""); require(sent, "FAILED_TO_WITHDRAW"); } /// @notice withdraw ERC20 tokens from the contract /// people always randomly transfer ERC20 tokens to the /// @param erc20TokenAddress the ERC20 token address /// @param recipient who will get the tokens /// @param amount how many tokens function withdrawERC20( address erc20TokenAddress, address recipient, uint256 amount ) external onlyOwner { IERC20 erc20Contract = IERC20(erc20TokenAddress); bool sent = erc20Contract.transfer(recipient, amount); require(sent, "ERC20_WITHDRAW_FAILED"); } /// @notice reserve some tokens for the team. Can only reserve gen 0 tokens /// we also need token 0 to so ssetup market places befor mint function reserve(address to, uint256 amount) external onlyOwner { require(totalSupply() + amount < PAID_TOKENS); uint256 supply = totalSupply(); for (uint8 i = 0; i < amount; i++) { uint256 tokenId = supply + i; _safeMint(to, tokenId); } } /// @notice delete all entries in the seeds and seedTokenBoundaries arrays /// just in case something weird happens function cleanSeeds() external onlyOwner { require(seeds.length > 0, "NO_SEEDS"); for (uint256 i = 0; i < seeds.length; i++) { delete seeds[i]; delete seedTokenBoundaries[i]; } } /// @notice set the price for requesting a random number to Chainlink VRF /// Note that the base link token has 18 zeroes. function setVRFPrice(uint256 _LINK_VRF_PRICE) external onlyOwner { require(_LINK_VRF_PRICE != LINK_VRF_PRICE, "NO_CHANGES"); LINK_VRF_PRICE = _LINK_VRF_PRICE; } /// @notice owner request reveal seed, just in case something goes wrong function requestRevealSeed() external onlyOwner { requestRandomness(KEY_HASH, LINK_VRF_PRICE); } /// ==== IVampireGameControls Overrides /// @notice see {IVampireGameControls.mintFromController(receiver, amount)} function mintFromController(address receiver, uint256 amount) external override { require(!mintFromControllerPaused, "MINT_FROM_CONTROLLER_PAUSED"); require(controllers[_msgSender()], "NOT_AUTHORIZED"); require(totalSupply() + amount <= MAX_SUPPLY, "NOT_ENOUGH_TOKENS"); for (uint256 i = 0; i < amount; i++) { uint256 tokenId = totalSupply(); _safeMint(receiver, tokenId); } } /// @notice for a game controller to reveal the metadata of multiple token ids function controllerRevealTokens( uint256[] calldata tokenIds, uint256[] calldata _seeds ) external override onlyControllers { require(!revealPaused, "REVEAL_PAUSED"); require( tokenIds.length == seeds.length, "INPUTS_SHOULD_HAVE_SAME_LENGTH" ); for (uint256 i = 0; i < tokenIds.length; i++) { _revealToken(tokenIds[i], _seeds[i]); } } /// ==== IVampireGame Overrides /// @notice see {IVampireGame.getGenZeroSupply()} function getGenZeroSupply() external view override returns (uint256) { return PAID_TOKENS; } /// @notice see {IVampireGame.getMaxSupply()} function getMaxSupply() external view override returns (uint256) { return MAX_SUPPLY; } /// @notice see {IVampireGame.getTokenTraits(tokenId)} function getTokenTraits(uint256 tokenId) external view override returns (TokenTraits memory) { return tokenTraits[tokenId]; } /// @notice see {IVampireGame.isTokenRevealed(tokenId)} function isTokenRevealed(uint256 tokenId) public view override returns (bool) { return tokenTraits[tokenId].exists; } /// ==== ERC721 Overrides function transferFrom( address from, address to, uint256 tokenId ) public virtual override { // Hardcode approval of game controllers if (!controllers[_msgSender()]) require( _isApprovedOrOwner(_msgSender(), tokenId), "ERC721: transfer caller is not owner nor approved" ); _transfer(from, to, tokenId); } function tokenURI(uint256 tokenId) public view override returns (string memory) { require( _exists(tokenId), "ERC721Metadata: URI query for nonexistent token" ); return traits.tokenURI(tokenId); } /// ==== Chainlink VRF Overrides /// @notice Fulfills randomness from Chainlink VRF /// @param requestId returned id of VRF request /// @param randomness random number from VRF function fulfillRandomness(bytes32 requestId, uint256 randomness) internal override { uint256 minted = totalSupply(); // the amount of tokens minted has to be greater than the latest recorded // seed boundary, otherwise it means that there is already a seed for tokens // up to the current amount of tokens if ( seedTokenBoundaries.length == 0 || minted > seedTokenBoundaries[seedTokenBoundaries.length - 1] ) { seeds.push(randomness); seedTokenBoundaries.push(minted); } // Otherwise we discard the number. I'm hoping this doesn't happen though :D // More info: I'm hoping that this won't happen bevause we'll only ask for seeds // on spaced enough intervals, but not guaranteeing it in the contract } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; /** * @dev Interface of the ERC20 standard as defined in the EIP. */ interface IERC20 { /** * @dev Returns the amount of tokens in existence. */ function totalSupply() external view returns (uint256); /** * @dev Returns the amount of tokens owned by `account`. */ function balanceOf(address account) external view returns (uint256); /** * @dev Moves `amount` tokens from the caller's account to `recipient`. * * Returns a boolean value indicating whether the operation succeeded. * * Emits a {Transfer} event. */ function transfer(address recipient, uint256 amount) external returns (bool); /** * @dev Returns the remaining number of tokens that `spender` will be * allowed to spend on behalf of `owner` through {transferFrom}. This is * zero by default. * * This value changes when {approve} or {transferFrom} are called. */ function allowance(address owner, address spender) external view returns (uint256); /** * @dev Sets `amount` as the allowance of `spender` over the caller's tokens. * * Returns a boolean value indicating whether the operation succeeded. * * IMPORTANT: Beware that changing an allowance with this method brings the risk * that someone may use both the old and the new allowance by unfortunate * transaction ordering. One possible solution to mitigate this race * condition is to first reduce the spender's allowance to 0 and set the * desired value afterwards: * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729 * * Emits an {Approval} event. */ function approve(address spender, uint256 amount) external returns (bool); /** * @dev Moves `amount` tokens from `sender` to `recipient` using the * allowance mechanism. `amount` is then deducted from the caller's * allowance. * * Returns a boolean value indicating whether the operation succeeded. * * Emits a {Transfer} event. */ function transferFrom( address sender, address recipient, uint256 amount ) external returns (bool); /** * @dev Emitted when `value` tokens are moved from one account (`from`) to * another (`to`). * * Note that `value` may be zero. */ event Transfer(address indexed from, address indexed to, uint256 value); /** * @dev Emitted when the allowance of a `spender` for an `owner` is set by * a call to {approve}. `value` is the new allowance. */ event Approval(address indexed owner, address indexed spender, uint256 value); }
// 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(); } }
// 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 "./math/Math.sol"; /** * @dev Collection of functions related to array types. */ library Arrays { /** * @dev Searches a sorted `array` and returns the first index that contains * a value greater or equal to `element`. If no such index exists (i.e. all * values in the array are strictly less than `element`), the array length is * returned. Time complexity O(log n). * * `array` is expected to be sorted in ascending order, and to contain no * repeated elements. */ function findUpperBound(uint256[] storage array, uint256 element) internal view returns (uint256) { if (array.length == 0) { return 0; } uint256 low = 0; uint256 high = array.length; while (low < high) { uint256 mid = Math.average(low, high); // Note that mid will always be strictly less than high (i.e. it will be a valid array index) // because Math.average rounds down (it does integer division with truncation). if (array[mid] > element) { high = mid; } else { low = mid + 1; } } // At this point `low` is the exclusive upper bound. We will return the inclusive upper bound. if (low > 0 && array[low - 1] == element) { return low - 1; } else { return low; } } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import "./interfaces/LinkTokenInterface.sol"; import "./VRFRequestIDBase.sol"; /** **************************************************************************** * @notice Interface for contracts using VRF randomness * ***************************************************************************** * @dev PURPOSE * * @dev Reggie the Random Oracle (not his real job) wants to provide randomness * @dev to Vera the verifier in such a way that Vera can be sure he's not * @dev making his output up to suit himself. Reggie provides Vera a public key * @dev to which he knows the secret key. Each time Vera provides a seed to * @dev Reggie, he gives back a value which is computed completely * @dev deterministically from the seed and the secret key. * * @dev Reggie provides a proof by which Vera can verify that the output was * @dev correctly computed once Reggie tells it to her, but without that proof, * @dev the output is indistinguishable to her from a uniform random sample * @dev from the output space. * * @dev The purpose of this contract is to make it easy for unrelated contracts * @dev to talk to Vera the verifier about the work Reggie is doing, to provide * @dev simple access to a verifiable source of randomness. * ***************************************************************************** * @dev USAGE * * @dev Calling contracts must inherit from VRFConsumerBase, and can * @dev initialize VRFConsumerBase's attributes in their constructor as * @dev shown: * * @dev contract VRFConsumer { * @dev constuctor(<other arguments>, address _vrfCoordinator, address _link) * @dev VRFConsumerBase(_vrfCoordinator, _link) public { * @dev <initialization with other arguments goes here> * @dev } * @dev } * * @dev The oracle will have given you an ID for the VRF keypair they have * @dev committed to (let's call it keyHash), and have told you the minimum LINK * @dev price for VRF service. Make sure your contract has sufficient LINK, and * @dev call requestRandomness(keyHash, fee, seed), where seed is the input you * @dev want to generate randomness from. * * @dev Once the VRFCoordinator has received and validated the oracle's response * @dev to your request, it will call your contract's fulfillRandomness method. * * @dev The randomness argument to fulfillRandomness is the actual random value * @dev generated from your seed. * * @dev The requestId argument is generated from the keyHash and the seed by * @dev makeRequestId(keyHash, seed). If your contract could have concurrent * @dev requests open, you can use the requestId to track which seed is * @dev associated with which randomness. See VRFRequestIDBase.sol for more * @dev details. (See "SECURITY CONSIDERATIONS" for principles to keep in mind, * @dev if your contract could have multiple requests in flight simultaneously.) * * @dev Colliding `requestId`s are cryptographically impossible as long as seeds * @dev differ. (Which is critical to making unpredictable randomness! See the * @dev next section.) * * ***************************************************************************** * @dev SECURITY CONSIDERATIONS * * @dev A method with the ability to call your fulfillRandomness method directly * @dev could spoof a VRF response with any random value, so it's critical that * @dev it cannot be directly called by anything other than this base contract * @dev (specifically, by the VRFConsumerBase.rawFulfillRandomness method). * * @dev For your users to trust that your contract's random behavior is free * @dev from malicious interference, it's best if you can write it so that all * @dev behaviors implied by a VRF response are executed *during* your * @dev fulfillRandomness method. If your contract must store the response (or * @dev anything derived from it) and use it later, you must ensure that any * @dev user-significant behavior which depends on that stored value cannot be * @dev manipulated by a subsequent VRF request. * * @dev Similarly, both miners and the VRF oracle itself have some influence * @dev over the order in which VRF responses appear on the blockchain, so if * @dev your contract could have multiple VRF requests in flight simultaneously, * @dev you must ensure that the order in which the VRF responses arrive cannot * @dev be used to manipulate your contract's user-significant behavior. * * @dev Since the ultimate input to the VRF is mixed with the block hash of the * @dev block in which the request is made, user-provided seeds have no impact * @dev on its economic security properties. They are only included for API * @dev compatability with previous versions of this contract. * * @dev Since the block hash of the block which contains the requestRandomness * @dev call is mixed into the input to the VRF *last*, a sufficiently powerful * @dev miner could, in principle, fork the blockchain to evict the block * @dev containing the request, forcing the request to be included in a * @dev different block with a different hash, and therefore a different input * @dev to the VRF. However, such an attack would incur a substantial economic * @dev cost. This cost scales with the number of blocks the VRF oracle waits * @dev until it calls responds to a request. */ abstract contract VRFConsumerBase is VRFRequestIDBase { /** * @notice fulfillRandomness handles the VRF response. Your contract must * @notice implement it. See "SECURITY CONSIDERATIONS" above for important * @notice principles to keep in mind when implementing your fulfillRandomness * @notice method. * * @dev VRFConsumerBase expects its subcontracts to have a method with this * @dev signature, and will call it once it has verified the proof * @dev associated with the randomness. (It is triggered via a call to * @dev rawFulfillRandomness, below.) * * @param requestId The Id initially returned by requestRandomness * @param randomness the VRF output */ function fulfillRandomness( bytes32 requestId, uint256 randomness ) internal virtual; /** * @dev In order to keep backwards compatibility we have kept the user * seed field around. We remove the use of it because given that the blockhash * enters later, it overrides whatever randomness the used seed provides. * Given that it adds no security, and can easily lead to misunderstandings, * we have removed it from usage and can now provide a simpler API. */ uint256 constant private USER_SEED_PLACEHOLDER = 0; /** * @notice requestRandomness initiates a request for VRF output given _seed * * @dev The fulfillRandomness method receives the output, once it's provided * @dev by the Oracle, and verified by the vrfCoordinator. * * @dev The _keyHash must already be registered with the VRFCoordinator, and * @dev the _fee must exceed the fee specified during registration of the * @dev _keyHash. * * @dev The _seed parameter is vestigial, and is kept only for API * @dev compatibility with older versions. It can't *hurt* to mix in some of * @dev your own randomness, here, but it's not necessary because the VRF * @dev oracle will mix the hash of the block containing your request into the * @dev VRF seed it ultimately uses. * * @param _keyHash ID of public key against which randomness is generated * @param _fee The amount of LINK to send with the request * * @return requestId unique ID for this request * * @dev The returned requestId can be used to distinguish responses to * @dev concurrent requests. It is passed as the first argument to * @dev fulfillRandomness. */ function requestRandomness( bytes32 _keyHash, uint256 _fee ) internal returns ( bytes32 requestId ) { LINK.transferAndCall(vrfCoordinator, _fee, abi.encode(_keyHash, USER_SEED_PLACEHOLDER)); // This is the seed passed to VRFCoordinator. The oracle will mix this with // the hash of the block containing this request to obtain the seed/input // which is finally passed to the VRF cryptographic machinery. uint256 vRFSeed = makeVRFInputSeed(_keyHash, USER_SEED_PLACEHOLDER, address(this), nonces[_keyHash]); // nonces[_keyHash] must stay in sync with // VRFCoordinator.nonces[_keyHash][this], which was incremented by the above // successful LINK.transferAndCall (in VRFCoordinator.randomnessRequest). // This provides protection against the user repeating their input seed, // which would result in a predictable/duplicate output, if multiple such // requests appeared in the same block. nonces[_keyHash] = nonces[_keyHash] + 1; return makeRequestId(_keyHash, vRFSeed); } LinkTokenInterface immutable internal LINK; address immutable private vrfCoordinator; // Nonces for each VRF key from which randomness has been requested. // // Must stay in sync with VRFCoordinator[_keyHash][this] mapping(bytes32 /* keyHash */ => uint256 /* nonce */) private nonces; /** * @param _vrfCoordinator address of VRFCoordinator contract * @param _link address of LINK token contract * * @dev https://docs.chain.link/docs/link-token-contracts */ constructor( address _vrfCoordinator, address _link ) { vrfCoordinator = _vrfCoordinator; LINK = LinkTokenInterface(_link); } // rawFulfillRandomness is called by VRFCoordinator when it receives a valid VRF // proof. rawFulfillRandomness then calls fulfillRandomness, after validating // the origin of the call function rawFulfillRandomness( bytes32 requestId, uint256 randomness ) external { require(msg.sender == vrfCoordinator, "Only VRFCoordinator can fulfill"); fulfillRandomness(requestId, randomness); } }
//SPDX-License-Identifier: Unlicense pragma solidity ^0.8.4; import "@openzeppelin/contracts/utils/cryptography/MerkleProof.sol"; /// @title AllowList /// @notice Adds simple merkle-tree based allow-list functionality to a contract. contract AllowList { /// @notice stores the Merkle Tree root. bytes32 internal _merkleTreeRoot; /// @notice Sets the new merkle tree root /// @param newMerkleTreeRoot the new root of the merkle tree function _setMerkleTreeRoot(bytes32 newMerkleTreeRoot) internal { require(_merkleTreeRoot != newMerkleTreeRoot, "NO_CHANGES"); _merkleTreeRoot = newMerkleTreeRoot; } /// @notice test if an address is part of the merkle tree /// @param _address the address to verify /// @param proof array of other hashes for proof calculation /// @return true if the address is part of the merkle tree function isAddressInAllowList(address _address, bytes32[] calldata proof) public view returns (bool) { bytes32 leaf = keccak256(abi.encodePacked(_address)); return MerkleProof.verify(proof, _merkleTreeRoot, leaf); } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.6; struct TokenTraits { /// @dev every initialised token should have this as true /// this is just used to check agains a non-initialized struct bool exists; bool isVampire; // Shared Traits uint8 skin; uint8 face; uint8 clothes; // Human-only Traits uint8 pants; uint8 boots; uint8 accessory; uint8 hair; // Vampire-only Traits uint8 cape; uint8 predatorIndex; }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.6; interface ITraits { function tokenURI(uint256 tokenId) external view returns (string memory); }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.6; import "./traits/TokenTraits.sol"; /// @notice Interface to interact with the VampireGame contract interface IVampireGame { /// @notice get the total supply of gen-0 function getGenZeroSupply() external view returns (uint256); /// @notice get the total supply of tokens function getMaxSupply() external view returns (uint256); /// @notice get the TokenTraits for a given tokenId function getTokenTraits(uint256 tokenId) external view returns (TokenTraits memory); /// @notice returns true if a token is aleady revealed function isTokenRevealed(uint256 tokenId) external view returns (bool); } /// @notice Interface to control parts of the VampireGame ERC 721 interface IVampireGameControls { /// @notice mint any amount of nft to any address /// Requirements: /// - message sender should be an allowed address (game contract) /// - amount + totalSupply() has to be smaller than MAX_SUPPLY function mintFromController(address receiver, uint256 amount) external; /// @notice reveal a list of tokens using specific seeds for each function controllerRevealTokens(uint256[] calldata tokenIds, uint256[] calldata _seeds) external; }
// 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 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; /** * @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); }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; /** * @dev Standard math utilities missing in the Solidity language. */ library Math { /** * @dev Returns the largest of two numbers. */ function max(uint256 a, uint256 b) internal pure returns (uint256) { return a >= b ? a : b; } /** * @dev Returns the smallest of two numbers. */ function min(uint256 a, uint256 b) internal pure returns (uint256) { return a < b ? a : b; } /** * @dev Returns the average of two numbers. The result is rounded towards * zero. */ function average(uint256 a, uint256 b) internal pure returns (uint256) { // (a + b) / 2 can overflow. return (a & b) + (a ^ b) / 2; } /** * @dev Returns the ceiling of the division of two numbers. * * This differs from standard division with `/` in that it rounds up instead * of rounding down. */ function ceilDiv(uint256 a, uint256 b) internal pure returns (uint256) { // (a + b - 1) / b can overflow on addition, so we distribute. return a / b + (a % b == 0 ? 0 : 1); } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; interface LinkTokenInterface { function allowance( address owner, address spender ) external view returns ( uint256 remaining ); function approve( address spender, uint256 value ) external returns ( bool success ); function balanceOf( address owner ) external view returns ( uint256 balance ); function decimals() external view returns ( uint8 decimalPlaces ); function decreaseApproval( address spender, uint256 addedValue ) external returns ( bool success ); function increaseApproval( address spender, uint256 subtractedValue ) external; function name() external view returns ( string memory tokenName ); function symbol() external view returns ( string memory tokenSymbol ); function totalSupply() external view returns ( uint256 totalTokensIssued ); function transfer( address to, uint256 value ) external returns ( bool success ); function transferAndCall( address to, uint256 value, bytes calldata data ) external returns ( bool success ); function transferFrom( address from, address to, uint256 value ) external returns ( bool success ); }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; contract VRFRequestIDBase { /** * @notice returns the seed which is actually input to the VRF coordinator * * @dev To prevent repetition of VRF output due to repetition of the * @dev user-supplied seed, that seed is combined in a hash with the * @dev user-specific nonce, and the address of the consuming contract. The * @dev risk of repetition is mostly mitigated by inclusion of a blockhash in * @dev the final seed, but the nonce does protect against repetition in * @dev requests which are included in a single block. * * @param _userSeed VRF seed input provided by user * @param _requester Address of the requesting contract * @param _nonce User-specific nonce at the time of the request */ function makeVRFInputSeed( bytes32 _keyHash, uint256 _userSeed, address _requester, uint256 _nonce ) internal pure returns ( uint256 ) { return uint256(keccak256(abi.encode(_keyHash, _userSeed, _requester, _nonce))); } /** * @notice Returns the id for this request * @param _keyHash The serviceAgreement ID to be used for this request * @param _vRFInputSeed The seed to be passed directly to the VRF * @return The id for this request * * @dev Note that _vRFInputSeed is not the seed passed by the consuming * @dev contract, but the one generated by makeVRFInputSeed */ function makeRequestId( bytes32 _keyHash, uint256 _vRFInputSeed ) internal pure returns ( bytes32 ) { return keccak256(abi.encodePacked(_keyHash, _vRFInputSeed)); } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; /** * @dev These functions deal with verification of Merkle Trees proofs. * * The proofs can be generated using the JavaScript library * https://github.com/miguelmota/merkletreejs[merkletreejs]. * Note: the hashing algorithm should be keccak256 and pair sorting should be enabled. * * See `test/utils/cryptography/MerkleProof.test.js` for some examples. */ library MerkleProof { /** * @dev Returns true if a `leaf` can be proved to be a part of a Merkle tree * defined by `root`. For this, a `proof` must be provided, containing * sibling hashes on the branch from the leaf to the root of the tree. Each * pair of leaves and each pair of pre-images are assumed to be sorted. */ function verify( bytes32[] memory proof, bytes32 root, bytes32 leaf ) internal pure returns (bool) { bytes32 computedHash = leaf; for (uint256 i = 0; i < proof.length; i++) { bytes32 proofElement = proof[i]; if (computedHash <= proofElement) { // Hash(current computed hash + current element of the proof) computedHash = keccak256(abi.encodePacked(computedHash, proofElement)); } else { // Hash(current element of the proof + current computed hash) computedHash = keccak256(abi.encodePacked(proofElement, computedHash)); } } // Check if the computed hash (root) is equal to the provided root return computedHash == root; } }
{ "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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IERC20","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"LINK_VRF_PRICE","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"MAX_PER_ADDRESS","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"MAX_PER_ADDRESS_PRESALE","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"MAX_SUPPLY","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"MINT_PRICE","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"PAID_TOKENS","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"},{"internalType":"uint256","name":"","type":"uint256"}],"name":"RARITIES","outputs":[{"internalType":"uint8","name":"","type":"uint8"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"SEED_BATCH_SIZE","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_controller","type":"address"}],"name":"addController","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"amountMintedByAddress","outputs":[{"internalType":"uint8","name":"","type":"uint8"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"approve","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"owner","type":"address"}],"name":"balanceOf","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"cleanSeeds","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256[]","name":"tokenIds","type":"uint256[]"},{"internalType":"uint256[]","name":"_seeds","type":"uint256[]"}],"name":"controllerRevealTokens","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"controllers","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"existingCombinations","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"getApproved","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getGenZeroSupply","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getMaxSupply","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"getTokenTraits","outputs":[{"components":[{"internalType":"bool","name":"exists","type":"bool"},{"internalType":"bool","name":"isVampire","type":"bool"},{"internalType":"uint8","name":"skin","type":"uint8"},{"internalType":"uint8","name":"face","type":"uint8"},{"internalType":"uint8","name":"clothes","type":"uint8"},{"internalType":"uint8","name":"pants","type":"uint8"},{"internalType":"uint8","name":"boots","type":"uint8"},{"internalType":"uint8","name":"accessory","type":"uint8"},{"internalType":"uint8","name":"hair","type":"uint8"},{"internalType":"uint8","name":"cape","type":"uint8"},{"internalType":"uint8","name":"predatorIndex","type":"uint8"}],"internalType":"struct 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ITraits","name":"","type":"address"}],"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":[],"name":"withdraw","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"erc20TokenAddress","type":"address"},{"internalType":"address","name":"recipient","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"withdrawERC20","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)
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
-----Decoded View---------------
Arg [0] : _LINK_KEY_HASH (bytes32): 0xaa77729d3466ca35ae8d28b3bbac7cc36a5031efdc430821c02bc31a238af445
Arg [1] : _LINK_ADDRESS (address): 0x514910771AF9Ca656af840dff83E8264EcF986CA
Arg [2] : _LINK_VRF_COORDINATOR_ADDRESS (address): 0xf0d54349aDdcf704F77AE15b96510dEA15cb7952
Arg [3] : _LINK_VRF_PRICE (uint256): 2000000000000000000
Arg [4] : _MINT_PRICE (uint256): 76660000000000000
Arg [5] : _MAX_SUPPLY (uint256): 50000
Arg [6] : _MAX_PER_ADDRESS (uint256): 10
Arg [7] : _MAX_PER_ADDRESS_PRESALE (uint256): 3
Arg [8] : _SEED_BATCH_SIZE (uint256): 1000
Arg [9] : _PAID_TOKENS (uint256): 10000
Arg [10] : _splitter (address): 0x26230E75989a76C4e7A5D939200243aCf9B41d35
-----Encoded View---------------
11 Constructor Arguments found :
Arg [0] : aa77729d3466ca35ae8d28b3bbac7cc36a5031efdc430821c02bc31a238af445
Arg [1] : 000000000000000000000000514910771af9ca656af840dff83e8264ecf986ca
Arg [2] : 000000000000000000000000f0d54349addcf704f77ae15b96510dea15cb7952
Arg [3] : 0000000000000000000000000000000000000000000000001bc16d674ec80000
Arg [4] : 000000000000000000000000000000000000000000000000011059dd247b4000
Arg [5] : 000000000000000000000000000000000000000000000000000000000000c350
Arg [6] : 000000000000000000000000000000000000000000000000000000000000000a
Arg [7] : 0000000000000000000000000000000000000000000000000000000000000003
Arg [8] : 00000000000000000000000000000000000000000000000000000000000003e8
Arg [9] : 0000000000000000000000000000000000000000000000000000000000002710
Arg [10] : 00000000000000000000000026230e75989a76c4e7a5d939200243acf9b41d35
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A token is a representation of an on-chain or off-chain asset. The token page shows information such as price, total supply, holders, transfers and social links. Learn more about this page in our Knowledge Base.