Overview
Max Total Supply
2,023,947 CK
Holders
120,843 (0.00%)
Market
Volume (24H)
0.0203 ETH
Min Price (24H)
$2.22 @ 0.000880 ETH
Max Price (24H)
$12.62 @ 0.005000 ETH
Other Info
Token Contract
Balance
1 CKLoading...
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# | Exchange | Pair | Price | 24H Volume | % Volume |
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Contract Name:
KittyCore
Compiler Version
v0.4.18+commit.9cf6e910
Optimization Enabled:
Yes with 200 runs
Other Settings:
default evmVersion
Contract Source Code (Solidity)
/** *Submitted for verification at Etherscan.io on 2017-11-28 */ pragma solidity ^0.4.11; /** * @title Ownable * @dev The Ownable contract has an owner address, and provides basic authorization control * functions, this simplifies the implementation of "user permissions". */ contract Ownable { address public owner; /** * @dev The Ownable constructor sets the original `owner` of the contract to the sender * account. */ function Ownable() { owner = msg.sender; } /** * @dev Throws if called by any account other than the owner. */ modifier onlyOwner() { require(msg.sender == owner); _; } /** * @dev Allows the current owner to transfer control of the contract to a newOwner. * @param newOwner The address to transfer ownership to. */ function transferOwnership(address newOwner) onlyOwner { if (newOwner != address(0)) { owner = newOwner; } } } /// @title Interface for contracts conforming to ERC-721: Non-Fungible Tokens /// @author Dieter Shirley <[email protected]> (https://github.com/dete) contract ERC721 { // Required methods function totalSupply() public view returns (uint256 total); function balanceOf(address _owner) public view returns (uint256 balance); function ownerOf(uint256 _tokenId) external view returns (address owner); function approve(address _to, uint256 _tokenId) external; function transfer(address _to, uint256 _tokenId) external; function transferFrom(address _from, address _to, uint256 _tokenId) external; // Events event Transfer(address from, address to, uint256 tokenId); event Approval(address owner, address approved, uint256 tokenId); // Optional // function name() public view returns (string name); // function symbol() public view returns (string symbol); // function tokensOfOwner(address _owner) external view returns (uint256[] tokenIds); // function tokenMetadata(uint256 _tokenId, string _preferredTransport) public view returns (string infoUrl); // ERC-165 Compatibility (https://github.com/ethereum/EIPs/issues/165) function supportsInterface(bytes4 _interfaceID) external view returns (bool); } // // Auction wrapper functions // Auction wrapper functions /// @title SEKRETOOOO contract GeneScienceInterface { /// @dev simply a boolean to indicate this is the contract we expect to be function isGeneScience() public pure returns (bool); /// @dev given genes of kitten 1 & 2, return a genetic combination - may have a random factor /// @param genes1 genes of mom /// @param genes2 genes of sire /// @return the genes that are supposed to be passed down the child function mixGenes(uint256 genes1, uint256 genes2, uint256 targetBlock) public returns (uint256); } /// @title A facet of KittyCore that manages special access privileges. /// @author Axiom Zen (https://www.axiomzen.co) /// @dev See the KittyCore contract documentation to understand how the various contract facets are arranged. contract KittyAccessControl { // This facet controls access control for CryptoKitties. There are four roles managed here: // // - The CEO: The CEO can reassign other roles and change the addresses of our dependent smart // contracts. It is also the only role that can unpause the smart contract. It is initially // set to the address that created the smart contract in the KittyCore constructor. // // - The CFO: The CFO can withdraw funds from KittyCore and its auction contracts. // // - The COO: The COO can release gen0 kitties to auction, and mint promo cats. // // It should be noted that these roles are distinct without overlap in their access abilities, the // abilities listed for each role above are exhaustive. In particular, while the CEO can assign any // address to any role, the CEO address itself doesn't have the ability to act in those roles. This // restriction is intentional so that we aren't tempted to use the CEO address frequently out of // convenience. The less we use an address, the less likely it is that we somehow compromise the // account. /// @dev Emited when contract is upgraded - See README.md for updgrade plan event ContractUpgrade(address newContract); // The addresses of the accounts (or contracts) that can execute actions within each roles. address public ceoAddress; address public cfoAddress; address public cooAddress; // @dev Keeps track whether the contract is paused. When that is true, most actions are blocked bool public paused = false; /// @dev Access modifier for CEO-only functionality modifier onlyCEO() { require(msg.sender == ceoAddress); _; } /// @dev Access modifier for CFO-only functionality modifier onlyCFO() { require(msg.sender == cfoAddress); _; } /// @dev Access modifier for COO-only functionality modifier onlyCOO() { require(msg.sender == cooAddress); _; } modifier onlyCLevel() { require( msg.sender == cooAddress || msg.sender == ceoAddress || msg.sender == cfoAddress ); _; } /// @dev Assigns a new address to act as the CEO. Only available to the current CEO. /// @param _newCEO The address of the new CEO function setCEO(address _newCEO) external onlyCEO { require(_newCEO != address(0)); ceoAddress = _newCEO; } /// @dev Assigns a new address to act as the CFO. Only available to the current CEO. /// @param _newCFO The address of the new CFO function setCFO(address _newCFO) external onlyCEO { require(_newCFO != address(0)); cfoAddress = _newCFO; } /// @dev Assigns a new address to act as the COO. Only available to the current CEO. /// @param _newCOO The address of the new COO function setCOO(address _newCOO) external onlyCEO { require(_newCOO != address(0)); cooAddress = _newCOO; } /*** Pausable functionality adapted from OpenZeppelin ***/ /// @dev Modifier to allow actions only when the contract IS NOT paused modifier whenNotPaused() { require(!paused); _; } /// @dev Modifier to allow actions only when the contract IS paused modifier whenPaused { require(paused); _; } /// @dev Called by any "C-level" role to pause the contract. Used only when /// a bug or exploit is detected and we need to limit damage. function pause() external onlyCLevel whenNotPaused { paused = true; } /// @dev Unpauses the smart contract. Can only be called by the CEO, since /// one reason we may pause the contract is when CFO or COO accounts are /// compromised. /// @notice This is public rather than external so it can be called by /// derived contracts. function unpause() public onlyCEO whenPaused { // can't unpause if contract was upgraded paused = false; } } /// @title Base contract for CryptoKitties. Holds all common structs, events and base variables. /// @author Axiom Zen (https://www.axiomzen.co) /// @dev See the KittyCore contract documentation to understand how the various contract facets are arranged. contract KittyBase is KittyAccessControl { /*** EVENTS ***/ /// @dev The Birth event is fired whenever a new kitten comes into existence. This obviously /// includes any time a cat is created through the giveBirth method, but it is also called /// when a new gen0 cat is created. event Birth(address owner, uint256 kittyId, uint256 matronId, uint256 sireId, uint256 genes); /// @dev Transfer event as defined in current draft of ERC721. Emitted every time a kitten /// ownership is assigned, including births. event Transfer(address from, address to, uint256 tokenId); /*** DATA TYPES ***/ /// @dev The main Kitty struct. Every cat in CryptoKitties is represented by a copy /// of this structure, so great care was taken to ensure that it fits neatly into /// exactly two 256-bit words. Note that the order of the members in this structure /// is important because of the byte-packing rules used by Ethereum. /// Ref: http://solidity.readthedocs.io/en/develop/miscellaneous.html struct Kitty { // The Kitty's genetic code is packed into these 256-bits, the format is // sooper-sekret! A cat's genes never change. uint256 genes; // The timestamp from the block when this cat came into existence. uint64 birthTime; // The minimum timestamp after which this cat can engage in breeding // activities again. This same timestamp is used for the pregnancy // timer (for matrons) as well as the siring cooldown. uint64 cooldownEndBlock; // The ID of the parents of this kitty, set to 0 for gen0 cats. // Note that using 32-bit unsigned integers limits us to a "mere" // 4 billion cats. This number might seem small until you realize // that Ethereum currently has a limit of about 500 million // transactions per year! So, this definitely won't be a problem // for several years (even as Ethereum learns to scale). uint32 matronId; uint32 sireId; // Set to the ID of the sire cat for matrons that are pregnant, // zero otherwise. A non-zero value here is how we know a cat // is pregnant. Used to retrieve the genetic material for the new // kitten when the birth transpires. uint32 siringWithId; // Set to the index in the cooldown array (see below) that represents // the current cooldown duration for this Kitty. This starts at zero // for gen0 cats, and is initialized to floor(generation/2) for others. // Incremented by one for each successful breeding action, regardless // of whether this cat is acting as matron or sire. uint16 cooldownIndex; // The "generation number" of this cat. Cats minted by the CK contract // for sale are called "gen0" and have a generation number of 0. The // generation number of all other cats is the larger of the two generation // numbers of their parents, plus one. // (i.e. max(matron.generation, sire.generation) + 1) uint16 generation; } /*** CONSTANTS ***/ /// @dev A lookup table indicating the cooldown duration after any successful /// breeding action, called "pregnancy time" for matrons and "siring cooldown" /// for sires. Designed such that the cooldown roughly doubles each time a cat /// is bred, encouraging owners not to just keep breeding the same cat over /// and over again. Caps out at one week (a cat can breed an unbounded number /// of times, and the maximum cooldown is always seven days). uint32[14] public cooldowns = [ uint32(1 minutes), uint32(2 minutes), uint32(5 minutes), uint32(10 minutes), uint32(30 minutes), uint32(1 hours), uint32(2 hours), uint32(4 hours), uint32(8 hours), uint32(16 hours), uint32(1 days), uint32(2 days), uint32(4 days), uint32(7 days) ]; // An approximation of currently how many seconds are in between blocks. uint256 public secondsPerBlock = 15; /*** STORAGE ***/ /// @dev An array containing the Kitty struct for all Kitties in existence. The ID /// of each cat is actually an index into this array. Note that ID 0 is a negacat, /// the unKitty, the mythical beast that is the parent of all gen0 cats. A bizarre /// creature that is both matron and sire... to itself! Has an invalid genetic code. /// In other words, cat ID 0 is invalid... ;-) Kitty[] kitties; /// @dev A mapping from cat IDs to the address that owns them. All cats have /// some valid owner address, even gen0 cats are created with a non-zero owner. mapping (uint256 => address) public kittyIndexToOwner; // @dev A mapping from owner address to count of tokens that address owns. // Used internally inside balanceOf() to resolve ownership count. mapping (address => uint256) ownershipTokenCount; /// @dev A mapping from KittyIDs to an address that has been approved to call /// transferFrom(). Each Kitty can only have one approved address for transfer /// at any time. A zero value means no approval is outstanding. mapping (uint256 => address) public kittyIndexToApproved; /// @dev A mapping from KittyIDs to an address that has been approved to use /// this Kitty for siring via breedWith(). Each Kitty can only have one approved /// address for siring at any time. A zero value means no approval is outstanding. mapping (uint256 => address) public sireAllowedToAddress; /// @dev The address of the ClockAuction contract that handles sales of Kitties. This /// same contract handles both peer-to-peer sales as well as the gen0 sales which are /// initiated every 15 minutes. SaleClockAuction public saleAuction; /// @dev The address of a custom ClockAuction subclassed contract that handles siring /// auctions. Needs to be separate from saleAuction because the actions taken on success /// after a sales and siring auction are quite different. SiringClockAuction public siringAuction; /// @dev Assigns ownership of a specific Kitty to an address. function _transfer(address _from, address _to, uint256 _tokenId) internal { // Since the number of kittens is capped to 2^32 we can't overflow this ownershipTokenCount[_to]++; // transfer ownership kittyIndexToOwner[_tokenId] = _to; // When creating new kittens _from is 0x0, but we can't account that address. if (_from != address(0)) { ownershipTokenCount[_from]--; // once the kitten is transferred also clear sire allowances delete sireAllowedToAddress[_tokenId]; // clear any previously approved ownership exchange delete kittyIndexToApproved[_tokenId]; } // Emit the transfer event. Transfer(_from, _to, _tokenId); } /// @dev An internal method that creates a new kitty and stores it. This /// method doesn't do any checking and should only be called when the /// input data is known to be valid. Will generate both a Birth event /// and a Transfer event. /// @param _matronId The kitty ID of the matron of this cat (zero for gen0) /// @param _sireId The kitty ID of the sire of this cat (zero for gen0) /// @param _generation The generation number of this cat, must be computed by caller. /// @param _genes The kitty's genetic code. /// @param _owner The inital owner of this cat, must be non-zero (except for the unKitty, ID 0) function _createKitty( uint256 _matronId, uint256 _sireId, uint256 _generation, uint256 _genes, address _owner ) internal returns (uint) { // These requires are not strictly necessary, our calling code should make // sure that these conditions are never broken. However! _createKitty() is already // an expensive call (for storage), and it doesn't hurt to be especially careful // to ensure our data structures are always valid. require(_matronId == uint256(uint32(_matronId))); require(_sireId == uint256(uint32(_sireId))); require(_generation == uint256(uint16(_generation))); // New kitty starts with the same cooldown as parent gen/2 uint16 cooldownIndex = uint16(_generation / 2); if (cooldownIndex > 13) { cooldownIndex = 13; } Kitty memory _kitty = Kitty({ genes: _genes, birthTime: uint64(now), cooldownEndBlock: 0, matronId: uint32(_matronId), sireId: uint32(_sireId), siringWithId: 0, cooldownIndex: cooldownIndex, generation: uint16(_generation) }); uint256 newKittenId = kitties.push(_kitty) - 1; // It's probably never going to happen, 4 billion cats is A LOT, but // let's just be 100% sure we never let this happen. require(newKittenId == uint256(uint32(newKittenId))); // emit the birth event Birth( _owner, newKittenId, uint256(_kitty.matronId), uint256(_kitty.sireId), _kitty.genes ); // This will assign ownership, and also emit the Transfer event as // per ERC721 draft _transfer(0, _owner, newKittenId); return newKittenId; } // Any C-level can fix how many seconds per blocks are currently observed. function setSecondsPerBlock(uint256 secs) external onlyCLevel { require(secs < cooldowns[0]); secondsPerBlock = secs; } } /// @title The external contract that is responsible for generating metadata for the kitties, /// it has one function that will return the data as bytes. contract ERC721Metadata { /// @dev Given a token Id, returns a byte array that is supposed to be converted into string. function getMetadata(uint256 _tokenId, string) public view returns (bytes32[4] buffer, uint256 count) { if (_tokenId == 1) { buffer[0] = "Hello World! :D"; count = 15; } else if (_tokenId == 2) { buffer[0] = "I would definitely choose a medi"; buffer[1] = "um length string."; count = 49; } else if (_tokenId == 3) { buffer[0] = "Lorem ipsum dolor sit amet, mi e"; buffer[1] = "st accumsan dapibus augue lorem,"; buffer[2] = " tristique vestibulum id, libero"; buffer[3] = " suscipit varius sapien aliquam."; count = 128; } } } /// @title The facet of the CryptoKitties core contract that manages ownership, ERC-721 (draft) compliant. /// @author Axiom Zen (https://www.axiomzen.co) /// @dev Ref: https://github.com/ethereum/EIPs/issues/721 /// See the KittyCore contract documentation to understand how the various contract facets are arranged. contract KittyOwnership is KittyBase, ERC721 { /// @notice Name and symbol of the non fungible token, as defined in ERC721. string public constant name = "CryptoKitties"; string public constant symbol = "CK"; // The contract that will return kitty metadata ERC721Metadata public erc721Metadata; bytes4 constant InterfaceSignature_ERC165 = bytes4(keccak256('supportsInterface(bytes4)')); bytes4 constant InterfaceSignature_ERC721 = bytes4(keccak256('name()')) ^ bytes4(keccak256('symbol()')) ^ bytes4(keccak256('totalSupply()')) ^ bytes4(keccak256('balanceOf(address)')) ^ bytes4(keccak256('ownerOf(uint256)')) ^ bytes4(keccak256('approve(address,uint256)')) ^ bytes4(keccak256('transfer(address,uint256)')) ^ bytes4(keccak256('transferFrom(address,address,uint256)')) ^ bytes4(keccak256('tokensOfOwner(address)')) ^ bytes4(keccak256('tokenMetadata(uint256,string)')); /// @notice Introspection interface as per ERC-165 (https://github.com/ethereum/EIPs/issues/165). /// Returns true for any standardized interfaces implemented by this contract. We implement /// ERC-165 (obviously!) and ERC-721. function supportsInterface(bytes4 _interfaceID) external view returns (bool) { // DEBUG ONLY //require((InterfaceSignature_ERC165 == 0x01ffc9a7) && (InterfaceSignature_ERC721 == 0x9a20483d)); return ((_interfaceID == InterfaceSignature_ERC165) || (_interfaceID == InterfaceSignature_ERC721)); } /// @dev Set the address of the sibling contract that tracks metadata. /// CEO only. function setMetadataAddress(address _contractAddress) public onlyCEO { erc721Metadata = ERC721Metadata(_contractAddress); } // Internal utility functions: These functions all assume that their input arguments // are valid. We leave it to public methods to sanitize their inputs and follow // the required logic. /// @dev Checks if a given address is the current owner of a particular Kitty. /// @param _claimant the address we are validating against. /// @param _tokenId kitten id, only valid when > 0 function _owns(address _claimant, uint256 _tokenId) internal view returns (bool) { return kittyIndexToOwner[_tokenId] == _claimant; } /// @dev Checks if a given address currently has transferApproval for a particular Kitty. /// @param _claimant the address we are confirming kitten is approved for. /// @param _tokenId kitten id, only valid when > 0 function _approvedFor(address _claimant, uint256 _tokenId) internal view returns (bool) { return kittyIndexToApproved[_tokenId] == _claimant; } /// @dev Marks an address as being approved for transferFrom(), overwriting any previous /// approval. Setting _approved to address(0) clears all transfer approval. /// NOTE: _approve() does NOT send the Approval event. This is intentional because /// _approve() and transferFrom() are used together for putting Kitties on auction, and /// there is no value in spamming the log with Approval events in that case. function _approve(uint256 _tokenId, address _approved) internal { kittyIndexToApproved[_tokenId] = _approved; } /// @notice Returns the number of Kitties owned by a specific address. /// @param _owner The owner address to check. /// @dev Required for ERC-721 compliance function balanceOf(address _owner) public view returns (uint256 count) { return ownershipTokenCount[_owner]; } /// @notice Transfers a Kitty to another address. If transferring to a smart /// contract be VERY CAREFUL to ensure that it is aware of ERC-721 (or /// CryptoKitties specifically) or your Kitty may be lost forever. Seriously. /// @param _to The address of the recipient, can be a user or contract. /// @param _tokenId The ID of the Kitty to transfer. /// @dev Required for ERC-721 compliance. function transfer( address _to, uint256 _tokenId ) external whenNotPaused { // Safety check to prevent against an unexpected 0x0 default. require(_to != address(0)); // Disallow transfers to this contract to prevent accidental misuse. // The contract should never own any kitties (except very briefly // after a gen0 cat is created and before it goes on auction). require(_to != address(this)); // Disallow transfers to the auction contracts to prevent accidental // misuse. Auction contracts should only take ownership of kitties // through the allow + transferFrom flow. require(_to != address(saleAuction)); require(_to != address(siringAuction)); // You can only send your own cat. require(_owns(msg.sender, _tokenId)); // Reassign ownership, clear pending approvals, emit Transfer event. _transfer(msg.sender, _to, _tokenId); } /// @notice Grant another address the right to transfer a specific Kitty via /// transferFrom(). This is the preferred flow for transfering NFTs to contracts. /// @param _to The address to be granted transfer approval. Pass address(0) to /// clear all approvals. /// @param _tokenId The ID of the Kitty that can be transferred if this call succeeds. /// @dev Required for ERC-721 compliance. function approve( address _to, uint256 _tokenId ) external whenNotPaused { // Only an owner can grant transfer approval. require(_owns(msg.sender, _tokenId)); // Register the approval (replacing any previous approval). _approve(_tokenId, _to); // Emit approval event. Approval(msg.sender, _to, _tokenId); } /// @notice Transfer a Kitty owned by another address, for which the calling address /// has previously been granted transfer approval by the owner. /// @param _from The address that owns the Kitty to be transfered. /// @param _to The address that should take ownership of the Kitty. Can be any address, /// including the caller. /// @param _tokenId The ID of the Kitty to be transferred. /// @dev Required for ERC-721 compliance. function transferFrom( address _from, address _to, uint256 _tokenId ) external whenNotPaused { // Safety check to prevent against an unexpected 0x0 default. require(_to != address(0)); // Disallow transfers to this contract to prevent accidental misuse. // The contract should never own any kitties (except very briefly // after a gen0 cat is created and before it goes on auction). require(_to != address(this)); // Check for approval and valid ownership require(_approvedFor(msg.sender, _tokenId)); require(_owns(_from, _tokenId)); // Reassign ownership (also clears pending approvals and emits Transfer event). _transfer(_from, _to, _tokenId); } /// @notice Returns the total number of Kitties currently in existence. /// @dev Required for ERC-721 compliance. function totalSupply() public view returns (uint) { return kitties.length - 1; } /// @notice Returns the address currently assigned ownership of a given Kitty. /// @dev Required for ERC-721 compliance. function ownerOf(uint256 _tokenId) external view returns (address owner) { owner = kittyIndexToOwner[_tokenId]; require(owner != address(0)); } /// @notice Returns a list of all Kitty IDs assigned to an address. /// @param _owner The owner whose Kitties we are interested in. /// @dev This method MUST NEVER be called by smart contract code. First, it's fairly /// expensive (it walks the entire Kitty array looking for cats belonging to owner), /// but it also returns a dynamic array, which is only supported for web3 calls, and /// not contract-to-contract calls. function tokensOfOwner(address _owner) external view returns(uint256[] ownerTokens) { uint256 tokenCount = balanceOf(_owner); if (tokenCount == 0) { // Return an empty array return new uint256[](0); } else { uint256[] memory result = new uint256[](tokenCount); uint256 totalCats = totalSupply(); uint256 resultIndex = 0; // We count on the fact that all cats have IDs starting at 1 and increasing // sequentially up to the totalCat count. uint256 catId; for (catId = 1; catId <= totalCats; catId++) { if (kittyIndexToOwner[catId] == _owner) { result[resultIndex] = catId; resultIndex++; } } return result; } } /// @dev Adapted from memcpy() by @arachnid (Nick Johnson <[email protected]>) /// This method is licenced under the Apache License. /// Ref: https://github.com/Arachnid/solidity-stringutils/blob/2f6ca9accb48ae14c66f1437ec50ed19a0616f78/strings.sol function _memcpy(uint _dest, uint _src, uint _len) private view { // Copy word-length chunks while possible for(; _len >= 32; _len -= 32) { assembly { mstore(_dest, mload(_src)) } _dest += 32; _src += 32; } // Copy remaining bytes uint256 mask = 256 ** (32 - _len) - 1; assembly { let srcpart := and(mload(_src), not(mask)) let destpart := and(mload(_dest), mask) mstore(_dest, or(destpart, srcpart)) } } /// @dev Adapted from toString(slice) by @arachnid (Nick Johnson <[email protected]>) /// This method is licenced under the Apache License. /// Ref: https://github.com/Arachnid/solidity-stringutils/blob/2f6ca9accb48ae14c66f1437ec50ed19a0616f78/strings.sol function _toString(bytes32[4] _rawBytes, uint256 _stringLength) private view returns (string) { var outputString = new string(_stringLength); uint256 outputPtr; uint256 bytesPtr; assembly { outputPtr := add(outputString, 32) bytesPtr := _rawBytes } _memcpy(outputPtr, bytesPtr, _stringLength); return outputString; } /// @notice Returns a URI pointing to a metadata package for this token conforming to /// ERC-721 (https://github.com/ethereum/EIPs/issues/721) /// @param _tokenId The ID number of the Kitty whose metadata should be returned. function tokenMetadata(uint256 _tokenId, string _preferredTransport) external view returns (string infoUrl) { require(erc721Metadata != address(0)); bytes32[4] memory buffer; uint256 count; (buffer, count) = erc721Metadata.getMetadata(_tokenId, _preferredTransport); return _toString(buffer, count); } } /// @title A facet of KittyCore that manages Kitty siring, gestation, and birth. /// @author Axiom Zen (https://www.axiomzen.co) /// @dev See the KittyCore contract documentation to understand how the various contract facets are arranged. contract KittyBreeding is KittyOwnership { /// @dev The Pregnant event is fired when two cats successfully breed and the pregnancy /// timer begins for the matron. event Pregnant(address owner, uint256 matronId, uint256 sireId, uint256 cooldownEndBlock); /// @notice The minimum payment required to use breedWithAuto(). This fee goes towards /// the gas cost paid by whatever calls giveBirth(), and can be dynamically updated by /// the COO role as the gas price changes. uint256 public autoBirthFee = 2 finney; // Keeps track of number of pregnant kitties. uint256 public pregnantKitties; /// @dev The address of the sibling contract that is used to implement the sooper-sekret /// genetic combination algorithm. GeneScienceInterface public geneScience; /// @dev Update the address of the genetic contract, can only be called by the CEO. /// @param _address An address of a GeneScience contract instance to be used from this point forward. function setGeneScienceAddress(address _address) external onlyCEO { GeneScienceInterface candidateContract = GeneScienceInterface(_address); // NOTE: verify that a contract is what we expect - https://github.com/Lunyr/crowdsale-contracts/blob/cfadd15986c30521d8ba7d5b6f57b4fefcc7ac38/contracts/LunyrToken.sol#L117 require(candidateContract.isGeneScience()); // Set the new contract address geneScience = candidateContract; } /// @dev Checks that a given kitten is able to breed. Requires that the /// current cooldown is finished (for sires) and also checks that there is /// no pending pregnancy. function _isReadyToBreed(Kitty _kit) internal view returns (bool) { // In addition to checking the cooldownEndBlock, we also need to check to see if // the cat has a pending birth; there can be some period of time between the end // of the pregnacy timer and the birth event. return (_kit.siringWithId == 0) && (_kit.cooldownEndBlock <= uint64(block.number)); } /// @dev Check if a sire has authorized breeding with this matron. True if both sire /// and matron have the same owner, or if the sire has given siring permission to /// the matron's owner (via approveSiring()). function _isSiringPermitted(uint256 _sireId, uint256 _matronId) internal view returns (bool) { address matronOwner = kittyIndexToOwner[_matronId]; address sireOwner = kittyIndexToOwner[_sireId]; // Siring is okay if they have same owner, or if the matron's owner was given // permission to breed with this sire. return (matronOwner == sireOwner || sireAllowedToAddress[_sireId] == matronOwner); } /// @dev Set the cooldownEndTime for the given Kitty, based on its current cooldownIndex. /// Also increments the cooldownIndex (unless it has hit the cap). /// @param _kitten A reference to the Kitty in storage which needs its timer started. function _triggerCooldown(Kitty storage _kitten) internal { // Compute an estimation of the cooldown time in blocks (based on current cooldownIndex). _kitten.cooldownEndBlock = uint64((cooldowns[_kitten.cooldownIndex]/secondsPerBlock) + block.number); // Increment the breeding count, clamping it at 13, which is the length of the // cooldowns array. We could check the array size dynamically, but hard-coding // this as a constant saves gas. Yay, Solidity! if (_kitten.cooldownIndex < 13) { _kitten.cooldownIndex += 1; } } /// @notice Grants approval to another user to sire with one of your Kitties. /// @param _addr The address that will be able to sire with your Kitty. Set to /// address(0) to clear all siring approvals for this Kitty. /// @param _sireId A Kitty that you own that _addr will now be able to sire with. function approveSiring(address _addr, uint256 _sireId) external whenNotPaused { require(_owns(msg.sender, _sireId)); sireAllowedToAddress[_sireId] = _addr; } /// @dev Updates the minimum payment required for calling giveBirthAuto(). Can only /// be called by the COO address. (This fee is used to offset the gas cost incurred /// by the autobirth daemon). function setAutoBirthFee(uint256 val) external onlyCOO { autoBirthFee = val; } /// @dev Checks to see if a given Kitty is pregnant and (if so) if the gestation /// period has passed. function _isReadyToGiveBirth(Kitty _matron) private view returns (bool) { return (_matron.siringWithId != 0) && (_matron.cooldownEndBlock <= uint64(block.number)); } /// @notice Checks that a given kitten is able to breed (i.e. it is not pregnant or /// in the middle of a siring cooldown). /// @param _kittyId reference the id of the kitten, any user can inquire about it function isReadyToBreed(uint256 _kittyId) public view returns (bool) { require(_kittyId > 0); Kitty storage kit = kitties[_kittyId]; return _isReadyToBreed(kit); } /// @dev Checks whether a kitty is currently pregnant. /// @param _kittyId reference the id of the kitten, any user can inquire about it function isPregnant(uint256 _kittyId) public view returns (bool) { require(_kittyId > 0); // A kitty is pregnant if and only if this field is set return kitties[_kittyId].siringWithId != 0; } /// @dev Internal check to see if a given sire and matron are a valid mating pair. DOES NOT /// check ownership permissions (that is up to the caller). /// @param _matron A reference to the Kitty struct of the potential matron. /// @param _matronId The matron's ID. /// @param _sire A reference to the Kitty struct of the potential sire. /// @param _sireId The sire's ID function _isValidMatingPair( Kitty storage _matron, uint256 _matronId, Kitty storage _sire, uint256 _sireId ) private view returns(bool) { // A Kitty can't breed with itself! if (_matronId == _sireId) { return false; } // Kitties can't breed with their parents. if (_matron.matronId == _sireId || _matron.sireId == _sireId) { return false; } if (_sire.matronId == _matronId || _sire.sireId == _matronId) { return false; } // We can short circuit the sibling check (below) if either cat is // gen zero (has a matron ID of zero). if (_sire.matronId == 0 || _matron.matronId == 0) { return true; } // Kitties can't breed with full or half siblings. if (_sire.matronId == _matron.matronId || _sire.matronId == _matron.sireId) { return false; } if (_sire.sireId == _matron.matronId || _sire.sireId == _matron.sireId) { return false; } // Everything seems cool! Let's get DTF. return true; } /// @dev Internal check to see if a given sire and matron are a valid mating pair for /// breeding via auction (i.e. skips ownership and siring approval checks). function _canBreedWithViaAuction(uint256 _matronId, uint256 _sireId) internal view returns (bool) { Kitty storage matron = kitties[_matronId]; Kitty storage sire = kitties[_sireId]; return _isValidMatingPair(matron, _matronId, sire, _sireId); } /// @notice Checks to see if two cats can breed together, including checks for /// ownership and siring approvals. Does NOT check that both cats are ready for /// breeding (i.e. breedWith could still fail until the cooldowns are finished). /// TODO: Shouldn't this check pregnancy and cooldowns?!? /// @param _matronId The ID of the proposed matron. /// @param _sireId The ID of the proposed sire. function canBreedWith(uint256 _matronId, uint256 _sireId) external view returns(bool) { require(_matronId > 0); require(_sireId > 0); Kitty storage matron = kitties[_matronId]; Kitty storage sire = kitties[_sireId]; return _isValidMatingPair(matron, _matronId, sire, _sireId) && _isSiringPermitted(_sireId, _matronId); } /// @dev Internal utility function to initiate breeding, assumes that all breeding /// requirements have been checked. function _breedWith(uint256 _matronId, uint256 _sireId) internal { // Grab a reference to the Kitties from storage. Kitty storage sire = kitties[_sireId]; Kitty storage matron = kitties[_matronId]; // Mark the matron as pregnant, keeping track of who the sire is. matron.siringWithId = uint32(_sireId); // Trigger the cooldown for both parents. _triggerCooldown(sire); _triggerCooldown(matron); // Clear siring permission for both parents. This may not be strictly necessary // but it's likely to avoid confusion! delete sireAllowedToAddress[_matronId]; delete sireAllowedToAddress[_sireId]; // Every time a kitty gets pregnant, counter is incremented. pregnantKitties++; // Emit the pregnancy event. Pregnant(kittyIndexToOwner[_matronId], _matronId, _sireId, matron.cooldownEndBlock); } /// @notice Breed a Kitty you own (as matron) with a sire that you own, or for which you /// have previously been given Siring approval. Will either make your cat pregnant, or will /// fail entirely. Requires a pre-payment of the fee given out to the first caller of giveBirth() /// @param _matronId The ID of the Kitty acting as matron (will end up pregnant if successful) /// @param _sireId The ID of the Kitty acting as sire (will begin its siring cooldown if successful) function breedWithAuto(uint256 _matronId, uint256 _sireId) external payable whenNotPaused { // Checks for payment. require(msg.value >= autoBirthFee); // Caller must own the matron. require(_owns(msg.sender, _matronId)); // Neither sire nor matron are allowed to be on auction during a normal // breeding operation, but we don't need to check that explicitly. // For matron: The caller of this function can't be the owner of the matron // because the owner of a Kitty on auction is the auction house, and the // auction house will never call breedWith(). // For sire: Similarly, a sire on auction will be owned by the auction house // and the act of transferring ownership will have cleared any oustanding // siring approval. // Thus we don't need to spend gas explicitly checking to see if either cat // is on auction. // Check that matron and sire are both owned by caller, or that the sire // has given siring permission to caller (i.e. matron's owner). // Will fail for _sireId = 0 require(_isSiringPermitted(_sireId, _matronId)); // Grab a reference to the potential matron Kitty storage matron = kitties[_matronId]; // Make sure matron isn't pregnant, or in the middle of a siring cooldown require(_isReadyToBreed(matron)); // Grab a reference to the potential sire Kitty storage sire = kitties[_sireId]; // Make sure sire isn't pregnant, or in the middle of a siring cooldown require(_isReadyToBreed(sire)); // Test that these cats are a valid mating pair. require(_isValidMatingPair( matron, _matronId, sire, _sireId )); // All checks passed, kitty gets pregnant! _breedWith(_matronId, _sireId); } /// @notice Have a pregnant Kitty give birth! /// @param _matronId A Kitty ready to give birth. /// @return The Kitty ID of the new kitten. /// @dev Looks at a given Kitty and, if pregnant and if the gestation period has passed, /// combines the genes of the two parents to create a new kitten. The new Kitty is assigned /// to the current owner of the matron. Upon successful completion, both the matron and the /// new kitten will be ready to breed again. Note that anyone can call this function (if they /// are willing to pay the gas!), but the new kitten always goes to the mother's owner. function giveBirth(uint256 _matronId) external whenNotPaused returns(uint256) { // Grab a reference to the matron in storage. Kitty storage matron = kitties[_matronId]; // Check that the matron is a valid cat. require(matron.birthTime != 0); // Check that the matron is pregnant, and that its time has come! require(_isReadyToGiveBirth(matron)); // Grab a reference to the sire in storage. uint256 sireId = matron.siringWithId; Kitty storage sire = kitties[sireId]; // Determine the higher generation number of the two parents uint16 parentGen = matron.generation; if (sire.generation > matron.generation) { parentGen = sire.generation; } // Call the sooper-sekret gene mixing operation. uint256 childGenes = geneScience.mixGenes(matron.genes, sire.genes, matron.cooldownEndBlock - 1); // Make the new kitten! address owner = kittyIndexToOwner[_matronId]; uint256 kittenId = _createKitty(_matronId, matron.siringWithId, parentGen + 1, childGenes, owner); // Clear the reference to sire from the matron (REQUIRED! Having siringWithId // set is what marks a matron as being pregnant.) delete matron.siringWithId; // Every time a kitty gives birth counter is decremented. pregnantKitties--; // Send the balance fee to the person who made birth happen. msg.sender.send(autoBirthFee); // return the new kitten's ID return kittenId; } } /// @title Auction Core /// @dev Contains models, variables, and internal methods for the auction. /// @notice We omit a fallback function to prevent accidental sends to this contract. contract ClockAuctionBase { // Represents an auction on an NFT struct Auction { // Current owner of NFT address seller; // Price (in wei) at beginning of auction uint128 startingPrice; // Price (in wei) at end of auction uint128 endingPrice; // Duration (in seconds) of auction uint64 duration; // Time when auction started // NOTE: 0 if this auction has been concluded uint64 startedAt; } // Reference to contract tracking NFT ownership ERC721 public nonFungibleContract; // Cut owner takes on each auction, measured in basis points (1/100 of a percent). // Values 0-10,000 map to 0%-100% uint256 public ownerCut; // Map from token ID to their corresponding auction. mapping (uint256 => Auction) tokenIdToAuction; event AuctionCreated(uint256 tokenId, uint256 startingPrice, uint256 endingPrice, uint256 duration); event AuctionSuccessful(uint256 tokenId, uint256 totalPrice, address winner); event AuctionCancelled(uint256 tokenId); /// @dev Returns true if the claimant owns the token. /// @param _claimant - Address claiming to own the token. /// @param _tokenId - ID of token whose ownership to verify. function _owns(address _claimant, uint256 _tokenId) internal view returns (bool) { return (nonFungibleContract.ownerOf(_tokenId) == _claimant); } /// @dev Escrows the NFT, assigning ownership to this contract. /// Throws if the escrow fails. /// @param _owner - Current owner address of token to escrow. /// @param _tokenId - ID of token whose approval to verify. function _escrow(address _owner, uint256 _tokenId) internal { // it will throw if transfer fails nonFungibleContract.transferFrom(_owner, this, _tokenId); } /// @dev Transfers an NFT owned by this contract to another address. /// Returns true if the transfer succeeds. /// @param _receiver - Address to transfer NFT to. /// @param _tokenId - ID of token to transfer. function _transfer(address _receiver, uint256 _tokenId) internal { // it will throw if transfer fails nonFungibleContract.transfer(_receiver, _tokenId); } /// @dev Adds an auction to the list of open auctions. Also fires the /// AuctionCreated event. /// @param _tokenId The ID of the token to be put on auction. /// @param _auction Auction to add. function _addAuction(uint256 _tokenId, Auction _auction) internal { // Require that all auctions have a duration of // at least one minute. (Keeps our math from getting hairy!) require(_auction.duration >= 1 minutes); tokenIdToAuction[_tokenId] = _auction; AuctionCreated( uint256(_tokenId), uint256(_auction.startingPrice), uint256(_auction.endingPrice), uint256(_auction.duration) ); } /// @dev Cancels an auction unconditionally. function _cancelAuction(uint256 _tokenId, address _seller) internal { _removeAuction(_tokenId); _transfer(_seller, _tokenId); AuctionCancelled(_tokenId); } /// @dev Computes the price and transfers winnings. /// Does NOT transfer ownership of token. function _bid(uint256 _tokenId, uint256 _bidAmount) internal returns (uint256) { // Get a reference to the auction struct Auction storage auction = tokenIdToAuction[_tokenId]; // Explicitly check that this auction is currently live. // (Because of how Ethereum mappings work, we can't just count // on the lookup above failing. An invalid _tokenId will just // return an auction object that is all zeros.) require(_isOnAuction(auction)); // Check that the bid is greater than or equal to the current price uint256 price = _currentPrice(auction); require(_bidAmount >= price); // Grab a reference to the seller before the auction struct // gets deleted. address seller = auction.seller; // The bid is good! Remove the auction before sending the fees // to the sender so we can't have a reentrancy attack. _removeAuction(_tokenId); // Transfer proceeds to seller (if there are any!) if (price > 0) { // Calculate the auctioneer's cut. // (NOTE: _computeCut() is guaranteed to return a // value <= price, so this subtraction can't go negative.) uint256 auctioneerCut = _computeCut(price); uint256 sellerProceeds = price - auctioneerCut; // NOTE: Doing a transfer() in the middle of a complex // method like this is generally discouraged because of // reentrancy attacks and DoS attacks if the seller is // a contract with an invalid fallback function. We explicitly // guard against reentrancy attacks by removing the auction // before calling transfer(), and the only thing the seller // can DoS is the sale of their own asset! (And if it's an // accident, they can call cancelAuction(). ) seller.transfer(sellerProceeds); } // Calculate any excess funds included with the bid. If the excess // is anything worth worrying about, transfer it back to bidder. // NOTE: We checked above that the bid amount is greater than or // equal to the price so this cannot underflow. uint256 bidExcess = _bidAmount - price; // Return the funds. Similar to the previous transfer, this is // not susceptible to a re-entry attack because the auction is // removed before any transfers occur. msg.sender.transfer(bidExcess); // Tell the world! AuctionSuccessful(_tokenId, price, msg.sender); return price; } /// @dev Removes an auction from the list of open auctions. /// @param _tokenId - ID of NFT on auction. function _removeAuction(uint256 _tokenId) internal { delete tokenIdToAuction[_tokenId]; } /// @dev Returns true if the NFT is on auction. /// @param _auction - Auction to check. function _isOnAuction(Auction storage _auction) internal view returns (bool) { return (_auction.startedAt > 0); } /// @dev Returns current price of an NFT on auction. Broken into two /// functions (this one, that computes the duration from the auction /// structure, and the other that does the price computation) so we /// can easily test that the price computation works correctly. function _currentPrice(Auction storage _auction) internal view returns (uint256) { uint256 secondsPassed = 0; // A bit of insurance against negative values (or wraparound). // Probably not necessary (since Ethereum guarnatees that the // now variable doesn't ever go backwards). if (now > _auction.startedAt) { secondsPassed = now - _auction.startedAt; } return _computeCurrentPrice( _auction.startingPrice, _auction.endingPrice, _auction.duration, secondsPassed ); } /// @dev Computes the current price of an auction. Factored out /// from _currentPrice so we can run extensive unit tests. /// When testing, make this function public and turn on /// `Current price computation` test suite. function _computeCurrentPrice( uint256 _startingPrice, uint256 _endingPrice, uint256 _duration, uint256 _secondsPassed ) internal pure returns (uint256) { // NOTE: We don't use SafeMath (or similar) in this function because // all of our public functions carefully cap the maximum values for // time (at 64-bits) and currency (at 128-bits). _duration is // also known to be non-zero (see the require() statement in // _addAuction()) if (_secondsPassed >= _duration) { // We've reached the end of the dynamic pricing portion // of the auction, just return the end price. return _endingPrice; } else { // Starting price can be higher than ending price (and often is!), so // this delta can be negative. int256 totalPriceChange = int256(_endingPrice) - int256(_startingPrice); // This multiplication can't overflow, _secondsPassed will easily fit within // 64-bits, and totalPriceChange will easily fit within 128-bits, their product // will always fit within 256-bits. int256 currentPriceChange = totalPriceChange * int256(_secondsPassed) / int256(_duration); // currentPriceChange can be negative, but if so, will have a magnitude // less that _startingPrice. Thus, this result will always end up positive. int256 currentPrice = int256(_startingPrice) + currentPriceChange; return uint256(currentPrice); } } /// @dev Computes owner's cut of a sale. /// @param _price - Sale price of NFT. function _computeCut(uint256 _price) internal view returns (uint256) { // NOTE: We don't use SafeMath (or similar) in this function because // all of our entry functions carefully cap the maximum values for // currency (at 128-bits), and ownerCut <= 10000 (see the require() // statement in the ClockAuction constructor). The result of this // function is always guaranteed to be <= _price. return _price * ownerCut / 10000; } } /** * @title Pausable * @dev Base contract which allows children to implement an emergency stop mechanism. */ contract Pausable is Ownable { event Pause(); event Unpause(); bool public paused = false; /** * @dev modifier to allow actions only when the contract IS paused */ modifier whenNotPaused() { require(!paused); _; } /** * @dev modifier to allow actions only when the contract IS NOT paused */ modifier whenPaused { require(paused); _; } /** * @dev called by the owner to pause, triggers stopped state */ function pause() onlyOwner whenNotPaused returns (bool) { paused = true; Pause(); return true; } /** * @dev called by the owner to unpause, returns to normal state */ function unpause() onlyOwner whenPaused returns (bool) { paused = false; Unpause(); return true; } } /// @title Clock auction for non-fungible tokens. /// @notice We omit a fallback function to prevent accidental sends to this contract. contract ClockAuction is Pausable, ClockAuctionBase { /// @dev The ERC-165 interface signature for ERC-721. /// Ref: https://github.com/ethereum/EIPs/issues/165 /// Ref: https://github.com/ethereum/EIPs/issues/721 bytes4 constant InterfaceSignature_ERC721 = bytes4(0x9a20483d); /// @dev Constructor creates a reference to the NFT ownership contract /// and verifies the owner cut is in the valid range. /// @param _nftAddress - address of a deployed contract implementing /// the Nonfungible Interface. /// @param _cut - percent cut the owner takes on each auction, must be /// between 0-10,000. function ClockAuction(address _nftAddress, uint256 _cut) public { require(_cut <= 10000); ownerCut = _cut; ERC721 candidateContract = ERC721(_nftAddress); require(candidateContract.supportsInterface(InterfaceSignature_ERC721)); nonFungibleContract = candidateContract; } /// @dev Remove all Ether from the contract, which is the owner's cuts /// as well as any Ether sent directly to the contract address. /// Always transfers to the NFT contract, but can be called either by /// the owner or the NFT contract. function withdrawBalance() external { address nftAddress = address(nonFungibleContract); require( msg.sender == owner || msg.sender == nftAddress ); // We are using this boolean method to make sure that even if one fails it will still work bool res = nftAddress.send(this.balance); } /// @dev Creates and begins a new auction. /// @param _tokenId - ID of token to auction, sender must be owner. /// @param _startingPrice - Price of item (in wei) at beginning of auction. /// @param _endingPrice - Price of item (in wei) at end of auction. /// @param _duration - Length of time to move between starting /// price and ending price (in seconds). /// @param _seller - Seller, if not the message sender function createAuction( uint256 _tokenId, uint256 _startingPrice, uint256 _endingPrice, uint256 _duration, address _seller ) external whenNotPaused { // Sanity check that no inputs overflow how many bits we've allocated // to store them in the auction struct. require(_startingPrice == uint256(uint128(_startingPrice))); require(_endingPrice == uint256(uint128(_endingPrice))); require(_duration == uint256(uint64(_duration))); require(_owns(msg.sender, _tokenId)); _escrow(msg.sender, _tokenId); Auction memory auction = Auction( _seller, uint128(_startingPrice), uint128(_endingPrice), uint64(_duration), uint64(now) ); _addAuction(_tokenId, auction); } /// @dev Bids on an open auction, completing the auction and transferring /// ownership of the NFT if enough Ether is supplied. /// @param _tokenId - ID of token to bid on. function bid(uint256 _tokenId) external payable whenNotPaused { // _bid will throw if the bid or funds transfer fails _bid(_tokenId, msg.value); _transfer(msg.sender, _tokenId); } /// @dev Cancels an auction that hasn't been won yet. /// Returns the NFT to original owner. /// @notice This is a state-modifying function that can /// be called while the contract is paused. /// @param _tokenId - ID of token on auction function cancelAuction(uint256 _tokenId) external { Auction storage auction = tokenIdToAuction[_tokenId]; require(_isOnAuction(auction)); address seller = auction.seller; require(msg.sender == seller); _cancelAuction(_tokenId, seller); } /// @dev Cancels an auction when the contract is paused. /// Only the owner may do this, and NFTs are returned to /// the seller. This should only be used in emergencies. /// @param _tokenId - ID of the NFT on auction to cancel. function cancelAuctionWhenPaused(uint256 _tokenId) whenPaused onlyOwner external { Auction storage auction = tokenIdToAuction[_tokenId]; require(_isOnAuction(auction)); _cancelAuction(_tokenId, auction.seller); } /// @dev Returns auction info for an NFT on auction. /// @param _tokenId - ID of NFT on auction. function getAuction(uint256 _tokenId) external view returns ( address seller, uint256 startingPrice, uint256 endingPrice, uint256 duration, uint256 startedAt ) { Auction storage auction = tokenIdToAuction[_tokenId]; require(_isOnAuction(auction)); return ( auction.seller, auction.startingPrice, auction.endingPrice, auction.duration, auction.startedAt ); } /// @dev Returns the current price of an auction. /// @param _tokenId - ID of the token price we are checking. function getCurrentPrice(uint256 _tokenId) external view returns (uint256) { Auction storage auction = tokenIdToAuction[_tokenId]; require(_isOnAuction(auction)); return _currentPrice(auction); } } /// @title Reverse auction modified for siring /// @notice We omit a fallback function to prevent accidental sends to this contract. contract SiringClockAuction is ClockAuction { // @dev Sanity check that allows us to ensure that we are pointing to the // right auction in our setSiringAuctionAddress() call. bool public isSiringClockAuction = true; // Delegate constructor function SiringClockAuction(address _nftAddr, uint256 _cut) public ClockAuction(_nftAddr, _cut) {} /// @dev Creates and begins a new auction. Since this function is wrapped, /// require sender to be KittyCore contract. /// @param _tokenId - ID of token to auction, sender must be owner. /// @param _startingPrice - Price of item (in wei) at beginning of auction. /// @param _endingPrice - Price of item (in wei) at end of auction. /// @param _duration - Length of auction (in seconds). /// @param _seller - Seller, if not the message sender function createAuction( uint256 _tokenId, uint256 _startingPrice, uint256 _endingPrice, uint256 _duration, address _seller ) external { // Sanity check that no inputs overflow how many bits we've allocated // to store them in the auction struct. require(_startingPrice == uint256(uint128(_startingPrice))); require(_endingPrice == uint256(uint128(_endingPrice))); require(_duration == uint256(uint64(_duration))); require(msg.sender == address(nonFungibleContract)); _escrow(_seller, _tokenId); Auction memory auction = Auction( _seller, uint128(_startingPrice), uint128(_endingPrice), uint64(_duration), uint64(now) ); _addAuction(_tokenId, auction); } /// @dev Places a bid for siring. Requires the sender /// is the KittyCore contract because all bid methods /// should be wrapped. Also returns the kitty to the /// seller rather than the winner. function bid(uint256 _tokenId) external payable { require(msg.sender == address(nonFungibleContract)); address seller = tokenIdToAuction[_tokenId].seller; // _bid checks that token ID is valid and will throw if bid fails _bid(_tokenId, msg.value); // We transfer the kitty back to the seller, the winner will get // the offspring _transfer(seller, _tokenId); } } /// @title Clock auction modified for sale of kitties /// @notice We omit a fallback function to prevent accidental sends to this contract. contract SaleClockAuction is ClockAuction { // @dev Sanity check that allows us to ensure that we are pointing to the // right auction in our setSaleAuctionAddress() call. bool public isSaleClockAuction = true; // Tracks last 5 sale price of gen0 kitty sales uint256 public gen0SaleCount; uint256[5] public lastGen0SalePrices; // Delegate constructor function SaleClockAuction(address _nftAddr, uint256 _cut) public ClockAuction(_nftAddr, _cut) {} /// @dev Creates and begins a new auction. /// @param _tokenId - ID of token to auction, sender must be owner. /// @param _startingPrice - Price of item (in wei) at beginning of auction. /// @param _endingPrice - Price of item (in wei) at end of auction. /// @param _duration - Length of auction (in seconds). /// @param _seller - Seller, if not the message sender function createAuction( uint256 _tokenId, uint256 _startingPrice, uint256 _endingPrice, uint256 _duration, address _seller ) external { // Sanity check that no inputs overflow how many bits we've allocated // to store them in the auction struct. require(_startingPrice == uint256(uint128(_startingPrice))); require(_endingPrice == uint256(uint128(_endingPrice))); require(_duration == uint256(uint64(_duration))); require(msg.sender == address(nonFungibleContract)); _escrow(_seller, _tokenId); Auction memory auction = Auction( _seller, uint128(_startingPrice), uint128(_endingPrice), uint64(_duration), uint64(now) ); _addAuction(_tokenId, auction); } /// @dev Updates lastSalePrice if seller is the nft contract /// Otherwise, works the same as default bid method. function bid(uint256 _tokenId) external payable { // _bid verifies token ID size address seller = tokenIdToAuction[_tokenId].seller; uint256 price = _bid(_tokenId, msg.value); _transfer(msg.sender, _tokenId); // If not a gen0 auction, exit if (seller == address(nonFungibleContract)) { // Track gen0 sale prices lastGen0SalePrices[gen0SaleCount % 5] = price; gen0SaleCount++; } } function averageGen0SalePrice() external view returns (uint256) { uint256 sum = 0; for (uint256 i = 0; i < 5; i++) { sum += lastGen0SalePrices[i]; } return sum / 5; } } /// @title Handles creating auctions for sale and siring of kitties. /// This wrapper of ReverseAuction exists only so that users can create /// auctions with only one transaction. contract KittyAuction is KittyBreeding { // @notice The auction contract variables are defined in KittyBase to allow // us to refer to them in KittyOwnership to prevent accidental transfers. // `saleAuction` refers to the auction for gen0 and p2p sale of kitties. // `siringAuction` refers to the auction for siring rights of kitties. /// @dev Sets the reference to the sale auction. /// @param _address - Address of sale contract. function setSaleAuctionAddress(address _address) external onlyCEO { SaleClockAuction candidateContract = SaleClockAuction(_address); // NOTE: verify that a contract is what we expect - https://github.com/Lunyr/crowdsale-contracts/blob/cfadd15986c30521d8ba7d5b6f57b4fefcc7ac38/contracts/LunyrToken.sol#L117 require(candidateContract.isSaleClockAuction()); // Set the new contract address saleAuction = candidateContract; } /// @dev Sets the reference to the siring auction. /// @param _address - Address of siring contract. function setSiringAuctionAddress(address _address) external onlyCEO { SiringClockAuction candidateContract = SiringClockAuction(_address); // NOTE: verify that a contract is what we expect - https://github.com/Lunyr/crowdsale-contracts/blob/cfadd15986c30521d8ba7d5b6f57b4fefcc7ac38/contracts/LunyrToken.sol#L117 require(candidateContract.isSiringClockAuction()); // Set the new contract address siringAuction = candidateContract; } /// @dev Put a kitty up for auction. /// Does some ownership trickery to create auctions in one tx. function createSaleAuction( uint256 _kittyId, uint256 _startingPrice, uint256 _endingPrice, uint256 _duration ) external whenNotPaused { // Auction contract checks input sizes // If kitty is already on any auction, this will throw // because it will be owned by the auction contract. require(_owns(msg.sender, _kittyId)); // Ensure the kitty is not pregnant to prevent the auction // contract accidentally receiving ownership of the child. // NOTE: the kitty IS allowed to be in a cooldown. require(!isPregnant(_kittyId)); _approve(_kittyId, saleAuction); // Sale auction throws if inputs are invalid and clears // transfer and sire approval after escrowing the kitty. saleAuction.createAuction( _kittyId, _startingPrice, _endingPrice, _duration, msg.sender ); } /// @dev Put a kitty up for auction to be sire. /// Performs checks to ensure the kitty can be sired, then /// delegates to reverse auction. function createSiringAuction( uint256 _kittyId, uint256 _startingPrice, uint256 _endingPrice, uint256 _duration ) external whenNotPaused { // Auction contract checks input sizes // If kitty is already on any auction, this will throw // because it will be owned by the auction contract. require(_owns(msg.sender, _kittyId)); require(isReadyToBreed(_kittyId)); _approve(_kittyId, siringAuction); // Siring auction throws if inputs are invalid and clears // transfer and sire approval after escrowing the kitty. siringAuction.createAuction( _kittyId, _startingPrice, _endingPrice, _duration, msg.sender ); } /// @dev Completes a siring auction by bidding. /// Immediately breeds the winning matron with the sire on auction. /// @param _sireId - ID of the sire on auction. /// @param _matronId - ID of the matron owned by the bidder. function bidOnSiringAuction( uint256 _sireId, uint256 _matronId ) external payable whenNotPaused { // Auction contract checks input sizes require(_owns(msg.sender, _matronId)); require(isReadyToBreed(_matronId)); require(_canBreedWithViaAuction(_matronId, _sireId)); // Define the current price of the auction. uint256 currentPrice = siringAuction.getCurrentPrice(_sireId); require(msg.value >= currentPrice + autoBirthFee); // Siring auction will throw if the bid fails. siringAuction.bid.value(msg.value - autoBirthFee)(_sireId); _breedWith(uint32(_matronId), uint32(_sireId)); } /// @dev Transfers the balance of the sale auction contract /// to the KittyCore contract. We use two-step withdrawal to /// prevent two transfer calls in the auction bid function. function withdrawAuctionBalances() external onlyCLevel { saleAuction.withdrawBalance(); siringAuction.withdrawBalance(); } } /// @title all functions related to creating kittens contract KittyMinting is KittyAuction { // Limits the number of cats the contract owner can ever create. uint256 public constant PROMO_CREATION_LIMIT = 5000; uint256 public constant GEN0_CREATION_LIMIT = 45000; // Constants for gen0 auctions. uint256 public constant GEN0_STARTING_PRICE = 10 finney; uint256 public constant GEN0_AUCTION_DURATION = 1 days; // Counts the number of cats the contract owner has created. uint256 public promoCreatedCount; uint256 public gen0CreatedCount; /// @dev we can create promo kittens, up to a limit. Only callable by COO /// @param _genes the encoded genes of the kitten to be created, any value is accepted /// @param _owner the future owner of the created kittens. Default to contract COO function createPromoKitty(uint256 _genes, address _owner) external onlyCOO { address kittyOwner = _owner; if (kittyOwner == address(0)) { kittyOwner = cooAddress; } require(promoCreatedCount < PROMO_CREATION_LIMIT); promoCreatedCount++; _createKitty(0, 0, 0, _genes, kittyOwner); } /// @dev Creates a new gen0 kitty with the given genes and /// creates an auction for it. function createGen0Auction(uint256 _genes) external onlyCOO { require(gen0CreatedCount < GEN0_CREATION_LIMIT); uint256 kittyId = _createKitty(0, 0, 0, _genes, address(this)); _approve(kittyId, saleAuction); saleAuction.createAuction( kittyId, _computeNextGen0Price(), 0, GEN0_AUCTION_DURATION, address(this) ); gen0CreatedCount++; } /// @dev Computes the next gen0 auction starting price, given /// the average of the past 5 prices + 50%. function _computeNextGen0Price() internal view returns (uint256) { uint256 avePrice = saleAuction.averageGen0SalePrice(); // Sanity check to ensure we don't overflow arithmetic require(avePrice == uint256(uint128(avePrice))); uint256 nextPrice = avePrice + (avePrice / 2); // We never auction for less than starting price if (nextPrice < GEN0_STARTING_PRICE) { nextPrice = GEN0_STARTING_PRICE; } return nextPrice; } } /// @title CryptoKitties: Collectible, breedable, and oh-so-adorable cats on the Ethereum blockchain. /// @author Axiom Zen (https://www.axiomzen.co) /// @dev The main CryptoKitties contract, keeps track of kittens so they don't wander around and get lost. contract KittyCore is KittyMinting { // This is the main CryptoKitties contract. In order to keep our code seperated into logical sections, // we've broken it up in two ways. First, we have several seperately-instantiated sibling contracts // that handle auctions and our super-top-secret genetic combination algorithm. The auctions are // seperate since their logic is somewhat complex and there's always a risk of subtle bugs. By keeping // them in their own contracts, we can upgrade them without disrupting the main contract that tracks // kitty ownership. The genetic combination algorithm is kept seperate so we can open-source all of // the rest of our code without making it _too_ easy for folks to figure out how the genetics work. // Don't worry, I'm sure someone will reverse engineer it soon enough! // // Secondly, we break the core contract into multiple files using inheritence, one for each major // facet of functionality of CK. This allows us to keep related code bundled together while still // avoiding a single giant file with everything in it. The breakdown is as follows: // // - KittyBase: This is where we define the most fundamental code shared throughout the core // functionality. This includes our main data storage, constants and data types, plus // internal functions for managing these items. // // - KittyAccessControl: This contract manages the various addresses and constraints for operations // that can be executed only by specific roles. Namely CEO, CFO and COO. // // - KittyOwnership: This provides the methods required for basic non-fungible token // transactions, following the draft ERC-721 spec (https://github.com/ethereum/EIPs/issues/721). // // - KittyBreeding: This file contains the methods necessary to breed cats together, including // keeping track of siring offers, and relies on an external genetic combination contract. // // - KittyAuctions: Here we have the public methods for auctioning or bidding on cats or siring // services. The actual auction functionality is handled in two sibling contracts (one // for sales and one for siring), while auction creation and bidding is mostly mediated // through this facet of the core contract. // // - KittyMinting: This final facet contains the functionality we use for creating new gen0 cats. // We can make up to 5000 "promo" cats that can be given away (especially important when // the community is new), and all others can only be created and then immediately put up // for auction via an algorithmically determined starting price. Regardless of how they // are created, there is a hard limit of 50k gen0 cats. After that, it's all up to the // community to breed, breed, breed! // Set in case the core contract is broken and an upgrade is required address public newContractAddress; /// @notice Creates the main CryptoKitties smart contract instance. function KittyCore() public { // Starts paused. paused = true; // the creator of the contract is the initial CEO ceoAddress = msg.sender; // the creator of the contract is also the initial COO cooAddress = msg.sender; // start with the mythical kitten 0 - so we don't have generation-0 parent issues _createKitty(0, 0, 0, uint256(-1), address(0)); } /// @dev Used to mark the smart contract as upgraded, in case there is a serious /// breaking bug. This method does nothing but keep track of the new contract and /// emit a message indicating that the new address is set. It's up to clients of this /// contract to update to the new contract address in that case. (This contract will /// be paused indefinitely if such an upgrade takes place.) /// @param _v2Address new address function setNewAddress(address _v2Address) external onlyCEO whenPaused { // See README.md for updgrade plan newContractAddress = _v2Address; ContractUpgrade(_v2Address); } /// @notice No tipping! /// @dev Reject all Ether from being sent here, unless it's from one of the /// two auction contracts. (Hopefully, we can prevent user accidents.) function() external payable { require( msg.sender == address(saleAuction) || msg.sender == address(siringAuction) ); } /// @notice Returns all the relevant information about a specific kitty. /// @param _id The ID of the kitty of interest. function getKitty(uint256 _id) external view returns ( bool isGestating, bool isReady, uint256 cooldownIndex, uint256 nextActionAt, uint256 siringWithId, uint256 birthTime, uint256 matronId, uint256 sireId, uint256 generation, uint256 genes ) { Kitty storage kit = kitties[_id]; // if this variable is 0 then it's not gestating isGestating = (kit.siringWithId != 0); isReady = (kit.cooldownEndBlock <= block.number); cooldownIndex = uint256(kit.cooldownIndex); nextActionAt = uint256(kit.cooldownEndBlock); siringWithId = uint256(kit.siringWithId); birthTime = uint256(kit.birthTime); matronId = uint256(kit.matronId); sireId = uint256(kit.sireId); generation = uint256(kit.generation); genes = kit.genes; } /// @dev Override unpause so it requires all external contract addresses /// to be set before contract can be unpaused. Also, we can't have /// newContractAddress set either, because then the contract was upgraded. /// @notice This is public rather than external so we can call super.unpause /// without using an expensive CALL. function unpause() public onlyCEO whenPaused { require(saleAuction != address(0)); require(siringAuction != address(0)); require(geneScience != address(0)); require(newContractAddress == address(0)); // Actually unpause the contract. super.unpause(); } // @dev Allows the CFO to capture the balance available to the contract. function withdrawBalance() external onlyCFO { uint256 balance = this.balance; // Subtract all the currently pregnant kittens we have, plus 1 of margin. uint256 subtractFees = (pregnantKitties + 1) * autoBirthFee; if (balance > subtractFees) { cfoAddress.send(balance - subtractFees); } } }
Contract Security Audit
- No Contract Security Audit Submitted- Submit Audit Here
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Contract Creation Code
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Swarm Source
bzzr://a6465fc1ce7ab1a92906ff7206b23d80a21bbd50b85b4bde6a91f8e6b2e3edde
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