ERC-20
Overview
Max Total Supply
10,261 STRK
Holders
1,514
Market
Onchain Market Cap
$0.00
Circulating Supply Market Cap
-
Other Info
Token Contract (WITH 0 Decimals)
Balance
4,224 STRKValue
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# | Exchange | Pair | Price | 24H Volume | % Volume |
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Contract Name:
StrikersCore
Compiler Version
v0.4.24+commit.e67f0147
Optimization Enabled:
No with 200 runs
Other Settings:
default evmVersion
Contract Source Code (Solidity)
/** *Submitted for verification at Etherscan.io on 2018-06-09 */ pragma solidity ^0.4.21; /** * @title ERC721 Non-Fungible Token Standard basic interface * @dev see https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md */ contract ERC721Basic { event Transfer(address indexed _from, address indexed _to, uint256 _tokenId); event Approval(address indexed _owner, address indexed _approved, uint256 _tokenId); event ApprovalForAll(address indexed _owner, address indexed _operator, bool _approved); function balanceOf(address _owner) public view returns (uint256 _balance); function ownerOf(uint256 _tokenId) public view returns (address _owner); function exists(uint256 _tokenId) public view returns (bool _exists); function approve(address _to, uint256 _tokenId) public; function getApproved(uint256 _tokenId) public view returns (address _operator); function setApprovalForAll(address _operator, bool _approved) public; function isApprovedForAll(address _owner, address _operator) public view returns (bool); function transferFrom(address _from, address _to, uint256 _tokenId) public; function safeTransferFrom(address _from, address _to, uint256 _tokenId) public; function safeTransferFrom( address _from, address _to, uint256 _tokenId, bytes _data ) public; } /** * @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; event OwnershipTransferred(address indexed previousOwner, address indexed newOwner); /** * @dev The Ownable constructor sets the original `owner` of the contract to the sender * account. */ function Ownable() public { 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) public onlyOwner { require(newOwner != address(0)); emit OwnershipTransferred(owner, newOwner); owner = newOwner; } } /// @title An optional contract that allows us to associate metadata to our cards. /// @author The CryptoStrikers Team contract StrikersMetadata { /// @dev The base url for the API where we fetch the metadata. /// ex: https://us-central1-cryptostrikers-api.cloudfunctions.net/cards/ string public apiUrl; constructor(string _apiUrl) public { apiUrl = _apiUrl; } /// @dev Returns the API URL for a given token Id. /// ex: https://us-central1-cryptostrikers-api.cloudfunctions.net/cards/22 /// Right now, this endpoint returns a JSON blob conforming to OpenSea's spec. /// see: https://docs.opensea.io/docs/2-adding-metadata function tokenURI(uint256 _tokenId) external view returns (string) { string memory _id = uint2str(_tokenId); return strConcat(apiUrl, _id); } // String helpers below were taken from Oraclize. // https://github.com/oraclize/ethereum-api/blob/master/oraclizeAPI_0.4.sol function strConcat(string _a, string _b) internal pure returns (string) { bytes memory _ba = bytes(_a); bytes memory _bb = bytes(_b); string memory ab = new string(_ba.length + _bb.length); bytes memory bab = bytes(ab); uint k = 0; for (uint i = 0; i < _ba.length; i++) bab[k++] = _ba[i]; for (i = 0; i < _bb.length; i++) bab[k++] = _bb[i]; return string(bab); } function uint2str(uint i) internal pure returns (string) { if (i == 0) return "0"; uint j = i; uint len; while (j != 0) { len++; j /= 10; } bytes memory bstr = new bytes(len); uint k = len - 1; while (i != 0) { bstr[k--] = byte(48 + i % 10); i /= 10; } return string(bstr); } } /** * @title ERC-721 Non-Fungible Token Standard, optional enumeration extension * @dev See https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md */ contract ERC721Enumerable is ERC721Basic { function totalSupply() public view returns (uint256); function tokenOfOwnerByIndex(address _owner, uint256 _index) public view returns (uint256 _tokenId); function tokenByIndex(uint256 _index) public view returns (uint256); } /** * @title ERC-721 Non-Fungible Token Standard, optional metadata extension * @dev See https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md */ contract ERC721Metadata is ERC721Basic { function name() public view returns (string _name); function symbol() public view returns (string _symbol); function tokenURI(uint256 _tokenId) public view returns (string); } /** * @title ERC-721 Non-Fungible Token Standard, full implementation interface * @dev See https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md */ contract ERC721 is ERC721Basic, ERC721Enumerable, ERC721Metadata { } /** * @title ERC721 token receiver interface * @dev Interface for any contract that wants to support safeTransfers * from ERC721 asset contracts. */ contract ERC721Receiver { /** * @dev Magic value to be returned upon successful reception of an NFT * Equals to `bytes4(keccak256("onERC721Received(address,uint256,bytes)"))`, * which can be also obtained as `ERC721Receiver(0).onERC721Received.selector` */ bytes4 constant ERC721_RECEIVED = 0xf0b9e5ba; /** * @notice Handle the receipt of an NFT * @dev The ERC721 smart contract calls this function on the recipient * after a `safetransfer`. This function MAY throw to revert and reject the * transfer. This function MUST use 50,000 gas or less. Return of other * than the magic value MUST result in the transaction being reverted. * Note: the contract address is always the message sender. * @param _from The sending address * @param _tokenId The NFT identifier which is being transfered * @param _data Additional data with no specified format * @return `bytes4(keccak256("onERC721Received(address,uint256,bytes)"))` */ function onERC721Received(address _from, uint256 _tokenId, bytes _data) public returns(bytes4); } /** * @title SafeMath * @dev Math operations with safety checks that throw on error */ library SafeMath { /** * @dev Multiplies two numbers, throws on overflow. */ function mul(uint256 a, uint256 b) internal pure returns (uint256 c) { if (a == 0) { return 0; } c = a * b; assert(c / a == b); return c; } /** * @dev Integer division of two numbers, truncating the quotient. */ function div(uint256 a, uint256 b) internal pure returns (uint256) { // assert(b > 0); // Solidity automatically throws when dividing by 0 // uint256 c = a / b; // assert(a == b * c + a % b); // There is no case in which this doesn't hold return a / b; } /** * @dev Subtracts two numbers, throws on overflow (i.e. if subtrahend is greater than minuend). */ function sub(uint256 a, uint256 b) internal pure returns (uint256) { assert(b <= a); return a - b; } /** * @dev Adds two numbers, throws on overflow. */ function add(uint256 a, uint256 b) internal pure returns (uint256 c) { c = a + b; assert(c >= a); return c; } } /** * Utility library of inline functions on addresses */ library AddressUtils { /** * Returns whether the target address is a contract * @dev This function will return false if invoked during the constructor of a contract, * as the code is not actually created until after the constructor finishes. * @param addr address to check * @return whether the target address is a contract */ function isContract(address addr) internal view returns (bool) { uint256 size; // XXX Currently there is no better way to check if there is a contract in an address // than to check the size of the code at that address. // See https://ethereum.stackexchange.com/a/14016/36603 // for more details about how this works. // TODO Check this again before the Serenity release, because all addresses will be // contracts then. assembly { size := extcodesize(addr) } // solium-disable-line security/no-inline-assembly return size > 0; } } /** * @title ERC721 Non-Fungible Token Standard basic implementation * @dev see https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md */ contract ERC721BasicToken is ERC721Basic { using SafeMath for uint256; using AddressUtils for address; // Equals to `bytes4(keccak256("onERC721Received(address,uint256,bytes)"))` // which can be also obtained as `ERC721Receiver(0).onERC721Received.selector` bytes4 constant ERC721_RECEIVED = 0xf0b9e5ba; // Mapping from token ID to owner mapping (uint256 => address) internal tokenOwner; // Mapping from token ID to approved address mapping (uint256 => address) internal tokenApprovals; // Mapping from owner to number of owned token mapping (address => uint256) internal ownedTokensCount; // Mapping from owner to operator approvals mapping (address => mapping (address => bool)) internal operatorApprovals; /** * @dev Guarantees msg.sender is owner of the given token * @param _tokenId uint256 ID of the token to validate its ownership belongs to msg.sender */ modifier onlyOwnerOf(uint256 _tokenId) { require(ownerOf(_tokenId) == msg.sender); _; } /** * @dev Checks msg.sender can transfer a token, by being owner, approved, or operator * @param _tokenId uint256 ID of the token to validate */ modifier canTransfer(uint256 _tokenId) { require(isApprovedOrOwner(msg.sender, _tokenId)); _; } /** * @dev Gets the balance of the specified address * @param _owner address to query the balance of * @return uint256 representing the amount owned by the passed address */ function balanceOf(address _owner) public view returns (uint256) { require(_owner != address(0)); return ownedTokensCount[_owner]; } /** * @dev Gets the owner of the specified token ID * @param _tokenId uint256 ID of the token to query the owner of * @return owner address currently marked as the owner of the given token ID */ function ownerOf(uint256 _tokenId) public view returns (address) { address owner = tokenOwner[_tokenId]; require(owner != address(0)); return owner; } /** * @dev Returns whether the specified token exists * @param _tokenId uint256 ID of the token to query the existance of * @return whether the token exists */ function exists(uint256 _tokenId) public view returns (bool) { address owner = tokenOwner[_tokenId]; return owner != address(0); } /** * @dev Approves another address to transfer the given token ID * @dev The zero address indicates there is no approved address. * @dev There can only be one approved address per token at a given time. * @dev Can only be called by the token owner or an approved operator. * @param _to address to be approved for the given token ID * @param _tokenId uint256 ID of the token to be approved */ function approve(address _to, uint256 _tokenId) public { address owner = ownerOf(_tokenId); require(_to != owner); require(msg.sender == owner || isApprovedForAll(owner, msg.sender)); if (getApproved(_tokenId) != address(0) || _to != address(0)) { tokenApprovals[_tokenId] = _to; emit Approval(owner, _to, _tokenId); } } /** * @dev Gets the approved address for a token ID, or zero if no address set * @param _tokenId uint256 ID of the token to query the approval of * @return address currently approved for a the given token ID */ function getApproved(uint256 _tokenId) public view returns (address) { return tokenApprovals[_tokenId]; } /** * @dev Sets or unsets the approval of a given operator * @dev An operator is allowed to transfer all tokens of the sender on their behalf * @param _to operator address to set the approval * @param _approved representing the status of the approval to be set */ function setApprovalForAll(address _to, bool _approved) public { require(_to != msg.sender); operatorApprovals[msg.sender][_to] = _approved; emit ApprovalForAll(msg.sender, _to, _approved); } /** * @dev Tells whether an operator is approved by a given owner * @param _owner owner address which you want to query the approval of * @param _operator operator address which you want to query the approval of * @return bool whether the given operator is approved by the given owner */ function isApprovedForAll(address _owner, address _operator) public view returns (bool) { return operatorApprovals[_owner][_operator]; } /** * @dev Transfers the ownership of a given token ID to another address * @dev Usage of this method is discouraged, use `safeTransferFrom` whenever possible * @dev Requires the msg sender to be the owner, approved, or operator * @param _from current owner of the token * @param _to address to receive the ownership of the given token ID * @param _tokenId uint256 ID of the token to be transferred */ function transferFrom(address _from, address _to, uint256 _tokenId) public canTransfer(_tokenId) { require(_from != address(0)); require(_to != address(0)); clearApproval(_from, _tokenId); removeTokenFrom(_from, _tokenId); addTokenTo(_to, _tokenId); emit Transfer(_from, _to, _tokenId); } /** * @dev Safely transfers the ownership of a given token ID to another address * @dev If the target address is a contract, it must implement `onERC721Received`, * which is called upon a safe transfer, and return the magic value * `bytes4(keccak256("onERC721Received(address,uint256,bytes)"))`; otherwise, * the transfer is reverted. * @dev Requires the msg sender to be the owner, approved, or operator * @param _from current owner of the token * @param _to address to receive the ownership of the given token ID * @param _tokenId uint256 ID of the token to be transferred */ function safeTransferFrom( address _from, address _to, uint256 _tokenId ) public canTransfer(_tokenId) { // solium-disable-next-line arg-overflow safeTransferFrom(_from, _to, _tokenId, ""); } /** * @dev Safely transfers the ownership of a given token ID to another address * @dev If the target address is a contract, it must implement `onERC721Received`, * which is called upon a safe transfer, and return the magic value * `bytes4(keccak256("onERC721Received(address,uint256,bytes)"))`; otherwise, * the transfer is reverted. * @dev Requires the msg sender to be the owner, approved, or operator * @param _from current owner of the token * @param _to address to receive the ownership of the given token ID * @param _tokenId uint256 ID of the token to be transferred * @param _data bytes data to send along with a safe transfer check */ function safeTransferFrom( address _from, address _to, uint256 _tokenId, bytes _data ) public canTransfer(_tokenId) { transferFrom(_from, _to, _tokenId); // solium-disable-next-line arg-overflow require(checkAndCallSafeTransfer(_from, _to, _tokenId, _data)); } /** * @dev Returns whether the given spender can transfer a given token ID * @param _spender address of the spender to query * @param _tokenId uint256 ID of the token to be transferred * @return bool whether the msg.sender is approved for the given token ID, * is an operator of the owner, or is the owner of the token */ function isApprovedOrOwner(address _spender, uint256 _tokenId) internal view returns (bool) { address owner = ownerOf(_tokenId); return _spender == owner || getApproved(_tokenId) == _spender || isApprovedForAll(owner, _spender); } /** * @dev Internal function to mint a new token * @dev Reverts if the given token ID already exists * @param _to The address that will own the minted token * @param _tokenId uint256 ID of the token to be minted by the msg.sender */ function _mint(address _to, uint256 _tokenId) internal { require(_to != address(0)); addTokenTo(_to, _tokenId); emit Transfer(address(0), _to, _tokenId); } /** * @dev Internal function to burn a specific token * @dev Reverts if the token does not exist * @param _tokenId uint256 ID of the token being burned by the msg.sender */ function _burn(address _owner, uint256 _tokenId) internal { clearApproval(_owner, _tokenId); removeTokenFrom(_owner, _tokenId); emit Transfer(_owner, address(0), _tokenId); } /** * @dev Internal function to clear current approval of a given token ID * @dev Reverts if the given address is not indeed the owner of the token * @param _owner owner of the token * @param _tokenId uint256 ID of the token to be transferred */ function clearApproval(address _owner, uint256 _tokenId) internal { require(ownerOf(_tokenId) == _owner); if (tokenApprovals[_tokenId] != address(0)) { tokenApprovals[_tokenId] = address(0); emit Approval(_owner, address(0), _tokenId); } } /** * @dev Internal function to add a token ID to the list of a given address * @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 addTokenTo(address _to, uint256 _tokenId) internal { require(tokenOwner[_tokenId] == address(0)); tokenOwner[_tokenId] = _to; ownedTokensCount[_to] = ownedTokensCount[_to].add(1); } /** * @dev Internal function to remove a token ID from the list of a given address * @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 removeTokenFrom(address _from, uint256 _tokenId) internal { require(ownerOf(_tokenId) == _from); ownedTokensCount[_from] = ownedTokensCount[_from].sub(1); tokenOwner[_tokenId] = address(0); } /** * @dev Internal function to invoke `onERC721Received` on a target address * @dev 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 whether the call correctly returned the expected magic value */ function checkAndCallSafeTransfer( address _from, address _to, uint256 _tokenId, bytes _data ) internal returns (bool) { if (!_to.isContract()) { return true; } bytes4 retval = ERC721Receiver(_to).onERC721Received(_from, _tokenId, _data); return (retval == ERC721_RECEIVED); } } /** * @title Full ERC721 Token * This implementation includes all the required and some optional functionality of the ERC721 standard * Moreover, it includes approve all functionality using operator terminology * @dev see https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md */ contract ERC721Token is ERC721, ERC721BasicToken { // Token name string internal name_; // Token symbol string internal symbol_; // Mapping from owner to list of owned token IDs mapping (address => uint256[]) internal ownedTokens; // Mapping from token ID to index of the owner tokens list mapping(uint256 => uint256) internal ownedTokensIndex; // Array with all token ids, used for enumeration uint256[] internal allTokens; // Mapping from token id to position in the allTokens array mapping(uint256 => uint256) internal allTokensIndex; // Optional mapping for token URIs mapping(uint256 => string) internal tokenURIs; /** * @dev Constructor function */ function ERC721Token(string _name, string _symbol) public { name_ = _name; symbol_ = _symbol; } /** * @dev Gets the token name * @return string representing the token name */ function name() public view returns (string) { return name_; } /** * @dev Gets the token symbol * @return string representing the token symbol */ function symbol() public view returns (string) { return symbol_; } /** * @dev Returns an URI for a given token ID * @dev Throws if the token ID does not exist. May return an empty string. * @param _tokenId uint256 ID of the token to query */ function tokenURI(uint256 _tokenId) public view returns (string) { require(exists(_tokenId)); return tokenURIs[_tokenId]; } /** * @dev Gets the token ID at a given index of the tokens list of the requested owner * @param _owner address owning the tokens list to be accessed * @param _index uint256 representing the index to be accessed of the requested tokens list * @return uint256 token ID at the given index of the tokens list owned by the requested address */ function tokenOfOwnerByIndex(address _owner, uint256 _index) public view returns (uint256) { require(_index < balanceOf(_owner)); return ownedTokens[_owner][_index]; } /** * @dev Gets the total amount of tokens stored by the contract * @return uint256 representing the total amount of tokens */ function totalSupply() public view returns (uint256) { return allTokens.length; } /** * @dev Gets the token ID at a given index of all the tokens in this contract * @dev Reverts if the index is greater or equal to the total number of tokens * @param _index uint256 representing the index to be accessed of the tokens list * @return uint256 token ID at the given index of the tokens list */ function tokenByIndex(uint256 _index) public view returns (uint256) { require(_index < totalSupply()); return allTokens[_index]; } /** * @dev Internal function to set the token URI for a given token * @dev Reverts if the token ID does not exist * @param _tokenId uint256 ID of the token to set its URI * @param _uri string URI to assign */ function _setTokenURI(uint256 _tokenId, string _uri) internal { require(exists(_tokenId)); tokenURIs[_tokenId] = _uri; } /** * @dev Internal function to add a token ID to the list of a given address * @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 addTokenTo(address _to, uint256 _tokenId) internal { super.addTokenTo(_to, _tokenId); uint256 length = ownedTokens[_to].length; ownedTokens[_to].push(_tokenId); ownedTokensIndex[_tokenId] = length; } /** * @dev Internal function to remove a token ID from the list of a given address * @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 removeTokenFrom(address _from, uint256 _tokenId) internal { super.removeTokenFrom(_from, _tokenId); uint256 tokenIndex = ownedTokensIndex[_tokenId]; uint256 lastTokenIndex = ownedTokens[_from].length.sub(1); uint256 lastToken = ownedTokens[_from][lastTokenIndex]; ownedTokens[_from][tokenIndex] = lastToken; ownedTokens[_from][lastTokenIndex] = 0; // Note that this will handle single-element arrays. In that case, both tokenIndex and lastTokenIndex are going to // be zero. Then we can make sure that we will remove _tokenId from the ownedTokens list since we are first swapping // the lastToken to the first position, and then dropping the element placed in the last position of the list ownedTokens[_from].length--; ownedTokensIndex[_tokenId] = 0; ownedTokensIndex[lastToken] = tokenIndex; } /** * @dev Internal function to mint a new token * @dev Reverts if the given token ID already exists * @param _to address the beneficiary that will own the minted token * @param _tokenId uint256 ID of the token to be minted by the msg.sender */ function _mint(address _to, uint256 _tokenId) internal { super._mint(_to, _tokenId); allTokensIndex[_tokenId] = allTokens.length; allTokens.push(_tokenId); } /** * @dev Internal function to burn a specific token * @dev Reverts if the token does not exist * @param _owner owner of the token to burn * @param _tokenId uint256 ID of the token being burned by the msg.sender */ function _burn(address _owner, uint256 _tokenId) internal { super._burn(_owner, _tokenId); // Clear metadata (if any) if (bytes(tokenURIs[_tokenId]).length != 0) { delete tokenURIs[_tokenId]; } // Reorg all tokens array uint256 tokenIndex = allTokensIndex[_tokenId]; uint256 lastTokenIndex = allTokens.length.sub(1); uint256 lastToken = allTokens[lastTokenIndex]; allTokens[tokenIndex] = lastToken; allTokens[lastTokenIndex] = 0; allTokens.length--; allTokensIndex[_tokenId] = 0; allTokensIndex[lastToken] = tokenIndex; } } /// @title The contract that manages all the players that appear in our game. /// @author The CryptoStrikers Team contract StrikersPlayerList is Ownable { // We only use playerIds in StrikersChecklist.sol (to // indicate which player features on instances of a // given ChecklistItem), and nowhere else in the app. // While it's not explictly necessary for any of our // contracts to know that playerId 0 corresponds to // Lionel Messi, we think that it's nice to have // a canonical source of truth for who the playerIds // actually refer to. Storing strings (player names) // is expensive, so we just use Events to prove that, // at some point, we said a playerId represents a given person. /// @dev The event we fire when we add a player. event PlayerAdded(uint8 indexed id, string name); /// @dev How many players we've added so far /// (max 255, though we don't plan on getting close) uint8 public playerCount; /// @dev Here we add the players we are launching with on Day 1. /// Players are loosely ranked by things like FIFA ratings, /// number of Instagram followers, and opinions of CryptoStrikers /// team members. Feel free to yell at us on Twitter. constructor() public { addPlayer("Lionel Messi"); // 0 addPlayer("Cristiano Ronaldo"); // 1 addPlayer("Neymar"); // 2 addPlayer("Mohamed Salah"); // 3 addPlayer("Robert Lewandowski"); // 4 addPlayer("Kevin De Bruyne"); // 5 addPlayer("Luka Modrić"); // 6 addPlayer("Eden Hazard"); // 7 addPlayer("Sergio Ramos"); // 8 addPlayer("Toni Kroos"); // 9 addPlayer("Luis Suárez"); // 10 addPlayer("Harry Kane"); // 11 addPlayer("Sergio Agüero"); // 12 addPlayer("Kylian Mbappé"); // 13 addPlayer("Gonzalo Higuaín"); // 14 addPlayer("David de Gea"); // 15 addPlayer("Antoine Griezmann"); // 16 addPlayer("N'Golo Kanté"); // 17 addPlayer("Edinson Cavani"); // 18 addPlayer("Paul Pogba"); // 19 addPlayer("Isco"); // 20 addPlayer("Marcelo"); // 21 addPlayer("Manuel Neuer"); // 22 addPlayer("Dries Mertens"); // 23 addPlayer("James Rodríguez"); // 24 addPlayer("Paulo Dybala"); // 25 addPlayer("Christian Eriksen"); // 26 addPlayer("David Silva"); // 27 addPlayer("Gabriel Jesus"); // 28 addPlayer("Thiago"); // 29 addPlayer("Thibaut Courtois"); // 30 addPlayer("Philippe Coutinho"); // 31 addPlayer("Andrés Iniesta"); // 32 addPlayer("Casemiro"); // 33 addPlayer("Romelu Lukaku"); // 34 addPlayer("Gerard Piqué"); // 35 addPlayer("Mats Hummels"); // 36 addPlayer("Diego Godín"); // 37 addPlayer("Mesut Özil"); // 38 addPlayer("Son Heung-min"); // 39 addPlayer("Raheem Sterling"); // 40 addPlayer("Hugo Lloris"); // 41 addPlayer("Radamel Falcao"); // 42 addPlayer("Ivan Rakitić"); // 43 addPlayer("Leroy Sané"); // 44 addPlayer("Roberto Firmino"); // 45 addPlayer("Sadio Mané"); // 46 addPlayer("Thomas Müller"); // 47 addPlayer("Dele Alli"); // 48 addPlayer("Keylor Navas"); // 49 addPlayer("Thiago Silva"); // 50 addPlayer("Raphaël Varane"); // 51 addPlayer("Ángel Di María"); // 52 addPlayer("Jordi Alba"); // 53 addPlayer("Medhi Benatia"); // 54 addPlayer("Timo Werner"); // 55 addPlayer("Gylfi Sigurðsson"); // 56 addPlayer("Nemanja Matić"); // 57 addPlayer("Kalidou Koulibaly"); // 58 addPlayer("Bernardo Silva"); // 59 addPlayer("Vincent Kompany"); // 60 addPlayer("João Moutinho"); // 61 addPlayer("Toby Alderweireld"); // 62 addPlayer("Emil Forsberg"); // 63 addPlayer("Mario Mandžukić"); // 64 addPlayer("Sergej Milinković-Savić"); // 65 addPlayer("Shinji Kagawa"); // 66 addPlayer("Granit Xhaka"); // 67 addPlayer("Andreas Christensen"); // 68 addPlayer("Piotr Zieliński"); // 69 addPlayer("Fyodor Smolov"); // 70 addPlayer("Xherdan Shaqiri"); // 71 addPlayer("Marcus Rashford"); // 72 addPlayer("Javier Hernández"); // 73 addPlayer("Hirving Lozano"); // 74 addPlayer("Hakim Ziyech"); // 75 addPlayer("Victor Moses"); // 76 addPlayer("Jefferson Farfán"); // 77 addPlayer("Mohamed Elneny"); // 78 addPlayer("Marcus Berg"); // 79 addPlayer("Guillermo Ochoa"); // 80 addPlayer("Igor Akinfeev"); // 81 addPlayer("Sardar Azmoun"); // 82 addPlayer("Christian Cueva"); // 83 addPlayer("Wahbi Khazri"); // 84 addPlayer("Keisuke Honda"); // 85 addPlayer("Tim Cahill"); // 86 addPlayer("John Obi Mikel"); // 87 addPlayer("Ki Sung-yueng"); // 88 addPlayer("Bryan Ruiz"); // 89 addPlayer("Maya Yoshida"); // 90 addPlayer("Nawaf Al Abed"); // 91 addPlayer("Lee Chung-yong"); // 92 addPlayer("Gabriel Gómez"); // 93 addPlayer("Naïm Sliti"); // 94 addPlayer("Reza Ghoochannejhad"); // 95 addPlayer("Mile Jedinak"); // 96 addPlayer("Mohammad Al-Sahlawi"); // 97 addPlayer("Aron Gunnarsson"); // 98 addPlayer("Blas Pérez"); // 99 addPlayer("Dani Alves"); // 100 addPlayer("Zlatan Ibrahimović"); // 101 } /// @dev Fires an event, proving that we said a player corresponds to a given ID. /// @param _name The name of the player we are adding. function addPlayer(string _name) public onlyOwner { require(playerCount < 255, "You've already added the maximum amount of players."); emit PlayerAdded(playerCount, _name); playerCount++; } } /// @title The contract that manages checklist items, sets, and rarity tiers. /// @author The CryptoStrikers Team contract StrikersChecklist is StrikersPlayerList { // High level overview of everything going on in this contract: // // ChecklistItem is the parent class to Card and has 3 properties: // - uint8 checklistId (000 to 255) // - uint8 playerId (see StrikersPlayerList.sol) // - RarityTier tier (more info below) // // Two things to note: the checklistId is not explicitly stored // on the checklistItem struct, and it's composed of two parts. // (For the following, assume it is left padded with zeros to reach // three digits, such that checklistId 0 becomes 000) // - the first digit represents the setId // * 0 = Originals Set // * 1 = Iconics Set // * 2 = Unreleased Set // - the last two digits represent its index in the appropriate set arary // // For example, checklist ID 100 would represent fhe first checklist item // in the iconicChecklistItems array (first digit = 1 = Iconics Set, last two // digits = 00 = first index of array) // // Because checklistId is represented as a uint8 throughout the app, the highest // value it can take is 255, which means we can't add more than 56 items to our // Unreleased Set's unreleasedChecklistItems array (setId 2). Also, once we've initialized // this contract, it's impossible for us to add more checklist items to the Originals // and Iconics set -- what you see here is what you get. // // Simple enough right? /// @dev We initialize this contract with so much data that we have /// to stage it in 4 different steps, ~33 checklist items at a time. enum DeployStep { WaitingForStepOne, WaitingForStepTwo, WaitingForStepThree, WaitingForStepFour, DoneInitialDeploy } /// @dev Enum containing all our rarity tiers, just because /// it's cleaner dealing with these values than with uint8s. enum RarityTier { IconicReferral, IconicInsert, Diamond, Gold, Silver, Bronze } /// @dev A lookup table indicating how limited the cards /// in each tier are. If this value is 0, it means /// that cards of this rarity tier are unlimited, /// which is only the case for the 8 Iconics cards /// we give away as part of our referral program. uint16[] public tierLimits = [ 0, // Iconic - Referral Bonus (uncapped) 100, // Iconic Inserts ("Card of the Day") 1000, // Diamond 1664, // Gold 3328, // Silver 4352 // Bronze ]; /// @dev ChecklistItem is essentially the parent class to Card. /// It represents a given superclass of cards (eg Originals Messi), /// and then each Card is an instance of this ChecklistItem, with /// its own serial number, mint date, etc. struct ChecklistItem { uint8 playerId; RarityTier tier; } /// @dev The deploy step we're at. Defaults to WaitingForStepOne. DeployStep public deployStep; /// @dev Array containing all the Originals checklist items (000 - 099) ChecklistItem[] public originalChecklistItems; /// @dev Array containing all the Iconics checklist items (100 - 131) ChecklistItem[] public iconicChecklistItems; /// @dev Array containing all the unreleased checklist items (200 - 255 max) ChecklistItem[] public unreleasedChecklistItems; /// @dev Internal function to add a checklist item to the Originals set. /// @param _playerId The player represented by this checklist item. (see StrikersPlayerList.sol) /// @param _tier This checklist item's rarity tier. (see Rarity Tier enum and corresponding tierLimits) function _addOriginalChecklistItem(uint8 _playerId, RarityTier _tier) internal { originalChecklistItems.push(ChecklistItem({ playerId: _playerId, tier: _tier })); } /// @dev Internal function to add a checklist item to the Iconics set. /// @param _playerId The player represented by this checklist item. (see StrikersPlayerList.sol) /// @param _tier This checklist item's rarity tier. (see Rarity Tier enum and corresponding tierLimits) function _addIconicChecklistItem(uint8 _playerId, RarityTier _tier) internal { iconicChecklistItems.push(ChecklistItem({ playerId: _playerId, tier: _tier })); } /// @dev External function to add a checklist item to our mystery set. /// Must have completed initial deploy, and can't add more than 56 items (because checklistId is a uint8). /// @param _playerId The player represented by this checklist item. (see StrikersPlayerList.sol) /// @param _tier This checklist item's rarity tier. (see Rarity Tier enum and corresponding tierLimits) function addUnreleasedChecklistItem(uint8 _playerId, RarityTier _tier) external onlyOwner { require(deployStep == DeployStep.DoneInitialDeploy, "Finish deploying the Originals and Iconics sets first."); require(unreleasedCount() < 56, "You can't add any more checklist items."); require(_playerId < playerCount, "This player doesn't exist in our player list."); unreleasedChecklistItems.push(ChecklistItem({ playerId: _playerId, tier: _tier })); } /// @dev Returns how many Original checklist items we've added. function originalsCount() external view returns (uint256) { return originalChecklistItems.length; } /// @dev Returns how many Iconic checklist items we've added. function iconicsCount() public view returns (uint256) { return iconicChecklistItems.length; } /// @dev Returns how many Unreleased checklist items we've added. function unreleasedCount() public view returns (uint256) { return unreleasedChecklistItems.length; } // In the next four functions, we initialize this contract with our // 132 initial checklist items (100 Originals, 32 Iconics). Because // of how much data we need to store, it has to be broken up into // four different function calls, which need to be called in sequence. // The ordering of the checklist items we add determines their // checklist ID, which is left-padded in our frontend to be a // 3-digit identifier where the first digit is the setId and the last // 2 digits represents the checklist items index in the appropriate ___ChecklistItems array. // For example, Originals Messi is the first item for set ID 0, and this // is displayed as #000 throughout the app. Our Card struct declare its // checklistId property as uint8, so we have // to be mindful that we can only have 256 total checklist items. /// @dev Deploys Originals #000 through #032. function deployStepOne() external onlyOwner { require(deployStep == DeployStep.WaitingForStepOne, "You're not following the steps in order..."); /* ORIGINALS - DIAMOND */ _addOriginalChecklistItem(0, RarityTier.Diamond); // 000 Messi _addOriginalChecklistItem(1, RarityTier.Diamond); // 001 Ronaldo _addOriginalChecklistItem(2, RarityTier.Diamond); // 002 Neymar _addOriginalChecklistItem(3, RarityTier.Diamond); // 003 Salah /* ORIGINALS - GOLD */ _addOriginalChecklistItem(4, RarityTier.Gold); // 004 Lewandowski _addOriginalChecklistItem(5, RarityTier.Gold); // 005 De Bruyne _addOriginalChecklistItem(6, RarityTier.Gold); // 006 Modrić _addOriginalChecklistItem(7, RarityTier.Gold); // 007 Hazard _addOriginalChecklistItem(8, RarityTier.Gold); // 008 Ramos _addOriginalChecklistItem(9, RarityTier.Gold); // 009 Kroos _addOriginalChecklistItem(10, RarityTier.Gold); // 010 Suárez _addOriginalChecklistItem(11, RarityTier.Gold); // 011 Kane _addOriginalChecklistItem(12, RarityTier.Gold); // 012 Agüero _addOriginalChecklistItem(13, RarityTier.Gold); // 013 Mbappé _addOriginalChecklistItem(14, RarityTier.Gold); // 014 Higuaín _addOriginalChecklistItem(15, RarityTier.Gold); // 015 de Gea _addOriginalChecklistItem(16, RarityTier.Gold); // 016 Griezmann _addOriginalChecklistItem(17, RarityTier.Gold); // 017 Kanté _addOriginalChecklistItem(18, RarityTier.Gold); // 018 Cavani _addOriginalChecklistItem(19, RarityTier.Gold); // 019 Pogba /* ORIGINALS - SILVER (020 to 032) */ _addOriginalChecklistItem(20, RarityTier.Silver); // 020 Isco _addOriginalChecklistItem(21, RarityTier.Silver); // 021 Marcelo _addOriginalChecklistItem(22, RarityTier.Silver); // 022 Neuer _addOriginalChecklistItem(23, RarityTier.Silver); // 023 Mertens _addOriginalChecklistItem(24, RarityTier.Silver); // 024 James _addOriginalChecklistItem(25, RarityTier.Silver); // 025 Dybala _addOriginalChecklistItem(26, RarityTier.Silver); // 026 Eriksen _addOriginalChecklistItem(27, RarityTier.Silver); // 027 David Silva _addOriginalChecklistItem(28, RarityTier.Silver); // 028 Gabriel Jesus _addOriginalChecklistItem(29, RarityTier.Silver); // 029 Thiago _addOriginalChecklistItem(30, RarityTier.Silver); // 030 Courtois _addOriginalChecklistItem(31, RarityTier.Silver); // 031 Coutinho _addOriginalChecklistItem(32, RarityTier.Silver); // 032 Iniesta // Move to the next deploy step. deployStep = DeployStep.WaitingForStepTwo; } /// @dev Deploys Originals #033 through #065. function deployStepTwo() external onlyOwner { require(deployStep == DeployStep.WaitingForStepTwo, "You're not following the steps in order..."); /* ORIGINALS - SILVER (033 to 049) */ _addOriginalChecklistItem(33, RarityTier.Silver); // 033 Casemiro _addOriginalChecklistItem(34, RarityTier.Silver); // 034 Lukaku _addOriginalChecklistItem(35, RarityTier.Silver); // 035 Piqué _addOriginalChecklistItem(36, RarityTier.Silver); // 036 Hummels _addOriginalChecklistItem(37, RarityTier.Silver); // 037 Godín _addOriginalChecklistItem(38, RarityTier.Silver); // 038 Özil _addOriginalChecklistItem(39, RarityTier.Silver); // 039 Son _addOriginalChecklistItem(40, RarityTier.Silver); // 040 Sterling _addOriginalChecklistItem(41, RarityTier.Silver); // 041 Lloris _addOriginalChecklistItem(42, RarityTier.Silver); // 042 Falcao _addOriginalChecklistItem(43, RarityTier.Silver); // 043 Rakitić _addOriginalChecklistItem(44, RarityTier.Silver); // 044 Sané _addOriginalChecklistItem(45, RarityTier.Silver); // 045 Firmino _addOriginalChecklistItem(46, RarityTier.Silver); // 046 Mané _addOriginalChecklistItem(47, RarityTier.Silver); // 047 Müller _addOriginalChecklistItem(48, RarityTier.Silver); // 048 Alli _addOriginalChecklistItem(49, RarityTier.Silver); // 049 Navas /* ORIGINALS - BRONZE (050 to 065) */ _addOriginalChecklistItem(50, RarityTier.Bronze); // 050 Thiago Silva _addOriginalChecklistItem(51, RarityTier.Bronze); // 051 Varane _addOriginalChecklistItem(52, RarityTier.Bronze); // 052 Di María _addOriginalChecklistItem(53, RarityTier.Bronze); // 053 Alba _addOriginalChecklistItem(54, RarityTier.Bronze); // 054 Benatia _addOriginalChecklistItem(55, RarityTier.Bronze); // 055 Werner _addOriginalChecklistItem(56, RarityTier.Bronze); // 056 Sigurðsson _addOriginalChecklistItem(57, RarityTier.Bronze); // 057 Matić _addOriginalChecklistItem(58, RarityTier.Bronze); // 058 Koulibaly _addOriginalChecklistItem(59, RarityTier.Bronze); // 059 Bernardo Silva _addOriginalChecklistItem(60, RarityTier.Bronze); // 060 Kompany _addOriginalChecklistItem(61, RarityTier.Bronze); // 061 Moutinho _addOriginalChecklistItem(62, RarityTier.Bronze); // 062 Alderweireld _addOriginalChecklistItem(63, RarityTier.Bronze); // 063 Forsberg _addOriginalChecklistItem(64, RarityTier.Bronze); // 064 Mandžukić _addOriginalChecklistItem(65, RarityTier.Bronze); // 065 Milinković-Savić // Move to the next deploy step. deployStep = DeployStep.WaitingForStepThree; } /// @dev Deploys Originals #066 through #099. function deployStepThree() external onlyOwner { require(deployStep == DeployStep.WaitingForStepThree, "You're not following the steps in order..."); /* ORIGINALS - BRONZE (066 to 099) */ _addOriginalChecklistItem(66, RarityTier.Bronze); // 066 Kagawa _addOriginalChecklistItem(67, RarityTier.Bronze); // 067 Xhaka _addOriginalChecklistItem(68, RarityTier.Bronze); // 068 Christensen _addOriginalChecklistItem(69, RarityTier.Bronze); // 069 Zieliński _addOriginalChecklistItem(70, RarityTier.Bronze); // 070 Smolov _addOriginalChecklistItem(71, RarityTier.Bronze); // 071 Shaqiri _addOriginalChecklistItem(72, RarityTier.Bronze); // 072 Rashford _addOriginalChecklistItem(73, RarityTier.Bronze); // 073 Hernández _addOriginalChecklistItem(74, RarityTier.Bronze); // 074 Lozano _addOriginalChecklistItem(75, RarityTier.Bronze); // 075 Ziyech _addOriginalChecklistItem(76, RarityTier.Bronze); // 076 Moses _addOriginalChecklistItem(77, RarityTier.Bronze); // 077 Farfán _addOriginalChecklistItem(78, RarityTier.Bronze); // 078 Elneny _addOriginalChecklistItem(79, RarityTier.Bronze); // 079 Berg _addOriginalChecklistItem(80, RarityTier.Bronze); // 080 Ochoa _addOriginalChecklistItem(81, RarityTier.Bronze); // 081 Akinfeev _addOriginalChecklistItem(82, RarityTier.Bronze); // 082 Azmoun _addOriginalChecklistItem(83, RarityTier.Bronze); // 083 Cueva _addOriginalChecklistItem(84, RarityTier.Bronze); // 084 Khazri _addOriginalChecklistItem(85, RarityTier.Bronze); // 085 Honda _addOriginalChecklistItem(86, RarityTier.Bronze); // 086 Cahill _addOriginalChecklistItem(87, RarityTier.Bronze); // 087 Mikel _addOriginalChecklistItem(88, RarityTier.Bronze); // 088 Sung-yueng _addOriginalChecklistItem(89, RarityTier.Bronze); // 089 Ruiz _addOriginalChecklistItem(90, RarityTier.Bronze); // 090 Yoshida _addOriginalChecklistItem(91, RarityTier.Bronze); // 091 Al Abed _addOriginalChecklistItem(92, RarityTier.Bronze); // 092 Chung-yong _addOriginalChecklistItem(93, RarityTier.Bronze); // 093 Gómez _addOriginalChecklistItem(94, RarityTier.Bronze); // 094 Sliti _addOriginalChecklistItem(95, RarityTier.Bronze); // 095 Ghoochannejhad _addOriginalChecklistItem(96, RarityTier.Bronze); // 096 Jedinak _addOriginalChecklistItem(97, RarityTier.Bronze); // 097 Al-Sahlawi _addOriginalChecklistItem(98, RarityTier.Bronze); // 098 Gunnarsson _addOriginalChecklistItem(99, RarityTier.Bronze); // 099 Pérez // Move to the next deploy step. deployStep = DeployStep.WaitingForStepFour; } /// @dev Deploys all Iconics and marks the deploy as complete! function deployStepFour() external onlyOwner { require(deployStep == DeployStep.WaitingForStepFour, "You're not following the steps in order..."); /* ICONICS */ _addIconicChecklistItem(0, RarityTier.IconicInsert); // 100 Messi _addIconicChecklistItem(1, RarityTier.IconicInsert); // 101 Ronaldo _addIconicChecklistItem(2, RarityTier.IconicInsert); // 102 Neymar _addIconicChecklistItem(3, RarityTier.IconicInsert); // 103 Salah _addIconicChecklistItem(4, RarityTier.IconicInsert); // 104 Lewandowski _addIconicChecklistItem(5, RarityTier.IconicInsert); // 105 De Bruyne _addIconicChecklistItem(6, RarityTier.IconicInsert); // 106 Modrić _addIconicChecklistItem(7, RarityTier.IconicInsert); // 107 Hazard _addIconicChecklistItem(8, RarityTier.IconicInsert); // 108 Ramos _addIconicChecklistItem(9, RarityTier.IconicInsert); // 109 Kroos _addIconicChecklistItem(10, RarityTier.IconicInsert); // 110 Suárez _addIconicChecklistItem(11, RarityTier.IconicInsert); // 111 Kane _addIconicChecklistItem(12, RarityTier.IconicInsert); // 112 Agüero _addIconicChecklistItem(15, RarityTier.IconicInsert); // 113 de Gea _addIconicChecklistItem(16, RarityTier.IconicInsert); // 114 Griezmann _addIconicChecklistItem(17, RarityTier.IconicReferral); // 115 Kanté _addIconicChecklistItem(18, RarityTier.IconicReferral); // 116 Cavani _addIconicChecklistItem(19, RarityTier.IconicInsert); // 117 Pogba _addIconicChecklistItem(21, RarityTier.IconicInsert); // 118 Marcelo _addIconicChecklistItem(24, RarityTier.IconicInsert); // 119 James _addIconicChecklistItem(26, RarityTier.IconicInsert); // 120 Eriksen _addIconicChecklistItem(29, RarityTier.IconicReferral); // 121 Thiago _addIconicChecklistItem(36, RarityTier.IconicReferral); // 122 Hummels _addIconicChecklistItem(38, RarityTier.IconicReferral); // 123 Özil _addIconicChecklistItem(39, RarityTier.IconicInsert); // 124 Son _addIconicChecklistItem(46, RarityTier.IconicInsert); // 125 Mané _addIconicChecklistItem(48, RarityTier.IconicInsert); // 126 Alli _addIconicChecklistItem(49, RarityTier.IconicReferral); // 127 Navas _addIconicChecklistItem(73, RarityTier.IconicInsert); // 128 Hernández _addIconicChecklistItem(85, RarityTier.IconicInsert); // 129 Honda _addIconicChecklistItem(100, RarityTier.IconicReferral); // 130 Alves _addIconicChecklistItem(101, RarityTier.IconicReferral); // 131 Zlatan // Mark the initial deploy as complete. deployStep = DeployStep.DoneInitialDeploy; } /// @dev Returns the mint limit for a given checklist item, based on its tier. /// @param _checklistId Which checklist item we need to get the limit for. /// @return How much of this checklist item we are allowed to mint. function limitForChecklistId(uint8 _checklistId) external view returns (uint16) { RarityTier rarityTier; uint8 index; if (_checklistId < 100) { // Originals = #000 to #099 rarityTier = originalChecklistItems[_checklistId].tier; } else if (_checklistId < 200) { // Iconics = #100 to #131 index = _checklistId - 100; require(index < iconicsCount(), "This Iconics checklist item doesn't exist."); rarityTier = iconicChecklistItems[index].tier; } else { // Unreleased = #200 to max #255 index = _checklistId - 200; require(index < unreleasedCount(), "This Unreleased checklist item doesn't exist."); rarityTier = unreleasedChecklistItems[index].tier; } return tierLimits[uint8(rarityTier)]; } } /// @title Base contract for CryptoStrikers. Defines what a card is and how to mint one. /// @author The CryptoStrikers Team contract StrikersBase is ERC721Token("CryptoStrikers", "STRK") { /// @dev Emit this event whenever we mint a new card (see _mintCard below) event CardMinted(uint256 cardId); /// @dev The struct representing the game's main object, a sports trading card. struct Card { // The timestamp at which this card was minted. // With uint32 we are good until 2106, by which point we will have not minted // a card in like, 88 years. uint32 mintTime; // The checklist item represented by this card. See StrikersChecklist.sol for more info. uint8 checklistId; // Cards for a given player have a serial number, which gets // incremented in sequence. For example, if we mint 1000 of a card, // the third one to be minted has serialNumber = 3 (out of 1000). uint16 serialNumber; } /*** STORAGE ***/ /// @dev All the cards that have been minted, indexed by cardId. Card[] public cards; /// @dev Keeps track of how many cards we have minted for a given checklist item /// to make sure we don't go over the limit for it. /// NB: uint16 has a capacity of 65,535, but we are not minting more than /// 4,352 of any given checklist item. mapping (uint8 => uint16) public mintedCountForChecklistId; /// @dev A reference to our checklist contract, which contains all the minting limits. StrikersChecklist public strikersChecklist; /*** FUNCTIONS ***/ /// @dev For a given owner, returns two arrays. The first contains the IDs of every card owned /// by this address. The second returns the corresponding checklist ID for each of these cards. /// There are a few places we need this info in the web app and short of being able to return an /// actual array of Cards, this is the best solution we could come up with... function cardAndChecklistIdsForOwner(address _owner) external view returns (uint256[], uint8[]) { uint256[] memory cardIds = ownedTokens[_owner]; uint256 cardCount = cardIds.length; uint8[] memory checklistIds = new uint8[](cardCount); for (uint256 i = 0; i < cardCount; i++) { uint256 cardId = cardIds[i]; checklistIds[i] = cards[cardId].checklistId; } return (cardIds, checklistIds); } /// @dev An internal method that creates a new card and stores it. /// Emits both a CardMinted and a Transfer event. /// @param _checklistId The ID of the checklistItem represented by the card (see Checklist.sol) /// @param _owner The card's first owner! function _mintCard( uint8 _checklistId, address _owner ) internal returns (uint256) { uint16 mintLimit = strikersChecklist.limitForChecklistId(_checklistId); require(mintLimit == 0 || mintedCountForChecklistId[_checklistId] < mintLimit, "Can't mint any more of this card!"); uint16 serialNumber = ++mintedCountForChecklistId[_checklistId]; Card memory newCard = Card({ mintTime: uint32(now), checklistId: _checklistId, serialNumber: serialNumber }); uint256 newCardId = cards.push(newCard) - 1; emit CardMinted(newCardId); _mint(_owner, newCardId); return newCardId; } } /** * @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 make a function callable only when the contract is not paused. */ modifier whenNotPaused() { require(!paused); _; } /** * @dev Modifier to make a function callable only when the contract is paused. */ modifier whenPaused() { require(paused); _; } /** * @dev called by the owner to pause, triggers stopped state */ function pause() onlyOwner whenNotPaused public { paused = true; emit Pause(); } /** * @dev called by the owner to unpause, returns to normal state */ function unpause() onlyOwner whenPaused public { paused = false; emit Unpause(); } } /// @title The contract that exposes minting functions to the outside world and limits who can call them. /// @author The CryptoStrikers Team contract StrikersMinting is StrikersBase, Pausable { /// @dev Emit this when we decide to no longer mint a given checklist ID. event PulledFromCirculation(uint8 checklistId); /// @dev If the value for a checklistId is true, we can no longer mint it. mapping (uint8 => bool) public outOfCirculation; /// @dev The address of the contract that manages the pack sale. address public packSaleAddress; /// @dev Only the owner can update the address of the pack sale contract. /// @param _address The address of the new StrikersPackSale contract. function setPackSaleAddress(address _address) external onlyOwner { packSaleAddress = _address; } /// @dev Allows the contract at packSaleAddress to mint cards. /// @param _checklistId The checklist item represented by this new card. /// @param _owner The card's first owner! /// @return The new card's ID. function mintPackSaleCard(uint8 _checklistId, address _owner) external returns (uint256) { require(msg.sender == packSaleAddress, "Only the pack sale contract can mint here."); require(!outOfCirculation[_checklistId], "Can't mint any more of this checklist item..."); return _mintCard(_checklistId, _owner); } /// @dev Allows the owner to mint cards from our Unreleased Set. /// @param _checklistId The checklist item represented by this new card. Must be >= 200. /// @param _owner The card's first owner! function mintUnreleasedCard(uint8 _checklistId, address _owner) external onlyOwner { require(_checklistId >= 200, "You can only use this to mint unreleased cards."); require(!outOfCirculation[_checklistId], "Can't mint any more of this checklist item..."); _mintCard(_checklistId, _owner); } /// @dev Allows the owner or the pack sale contract to prevent an Iconic or Unreleased card from ever being minted again. /// @param _checklistId The Iconic or Unreleased card we want to remove from circulation. function pullFromCirculation(uint8 _checklistId) external { bool ownerOrPackSale = (msg.sender == owner) || (msg.sender == packSaleAddress); require(ownerOrPackSale, "Only the owner or pack sale can take checklist items out of circulation."); require(_checklistId >= 100, "This function is reserved for Iconics and Unreleased sets."); outOfCirculation[_checklistId] = true; emit PulledFromCirculation(_checklistId); } } /// @title StrikersTrading - Allows users to trustlessly trade cards. /// @author The CryptoStrikers Team contract StrikersTrading is StrikersMinting { /// @dev Emitting this allows us to look up if a trade has been /// successfully filled, by who, and which cards were involved. event TradeFilled( bytes32 indexed tradeHash, address indexed maker, uint256 makerCardId, address indexed taker, uint256 takerCardId ); /// @dev Emitting this allows us to look up if a trade has been cancelled. event TradeCancelled(bytes32 indexed tradeHash, address indexed maker); /// @dev All the possible states for a trade. enum TradeState { Valid, Filled, Cancelled } /// @dev Mapping of tradeHash => TradeState. Defaults to Valid. mapping (bytes32 => TradeState) public tradeStates; /// @dev A taker (someone who has received a signed trade hash) /// submits a cardId to this function and, if it satisfies /// the given criteria, the trade is executed. /// @param _maker Address of the maker (i.e. trade creator). /// @param _makerCardId ID of the card the maker has agreed to give up. /// @param _taker The counterparty the maker wishes to trade with (if it's address(0), anybody can fill the trade!) /// @param _takerCardOrChecklistId If taker is the 0-address, then this is a checklist ID (e.g. "any Originals John Smith"). /// If not, then it's a card ID (e.g. "Originals John Smith #8/100"). /// @param _salt A uint256 timestamp to differentiate trades that have otherwise identical params (prevents replay attacks). /// @param _submittedCardId The card the taker is using to fill the trade. Must satisfy either the card or checklist ID /// specified in _takerCardOrChecklistId. /// @param _v ECDSA signature parameter v from the tradeHash signed by the maker. /// @param _r ECDSA signature parameters r from the tradeHash signed by the maker. /// @param _s ECDSA signature parameters s from the tradeHash signed by the maker. function fillTrade( address _maker, uint256 _makerCardId, address _taker, uint256 _takerCardOrChecklistId, uint256 _salt, uint256 _submittedCardId, uint8 _v, bytes32 _r, bytes32 _s) external whenNotPaused { require(_maker != msg.sender, "You can't fill your own trade."); require(_taker == address(0) || _taker == msg.sender, "You are not authorized to fill this trade."); if (_taker == address(0)) { // This trade is open to the public so we are requesting a checklistItem, rather than a specific card. require(cards[_submittedCardId].checklistId == _takerCardOrChecklistId, "The card you submitted is not valid for this trade."); } else { // We are trading directly with another user and are requesting a specific card. require(_submittedCardId == _takerCardOrChecklistId, "The card you submitted is not valid for this trade."); } bytes32 tradeHash = getTradeHash( _maker, _makerCardId, _taker, _takerCardOrChecklistId, _salt ); require(tradeStates[tradeHash] == TradeState.Valid, "This trade is no longer valid."); require(isValidSignature(_maker, tradeHash, _v, _r, _s), "Invalid signature."); tradeStates[tradeHash] = TradeState.Filled; // For better UX, we assume that by signing the trade, the maker has given // implicit approval for this token to be transferred. This saves us from an // extra approval transaction... tokenApprovals[_makerCardId] = msg.sender; safeTransferFrom(_maker, msg.sender, _makerCardId); safeTransferFrom(msg.sender, _maker, _submittedCardId); emit TradeFilled(tradeHash, _maker, _makerCardId, msg.sender, _submittedCardId); } /// @dev Allows the maker to cancel a trade that hasn't been filled yet. /// @param _maker Address of the maker (i.e. trade creator). /// @param _makerCardId ID of the card the maker has agreed to give up. /// @param _taker The counterparty the maker wishes to trade with (if it's address(0), anybody can fill the trade!) /// @param _takerCardOrChecklistId If taker is the 0-address, then this is a checklist ID (e.g. "any Lionel Messi"). /// If not, then it's a card ID (e.g. "Lionel Messi #8/100"). /// @param _salt A uint256 timestamp to differentiate trades that have otherwise identical params (prevents replay attacks). function cancelTrade( address _maker, uint256 _makerCardId, address _taker, uint256 _takerCardOrChecklistId, uint256 _salt) external { require(_maker == msg.sender, "Only the trade creator can cancel this trade."); bytes32 tradeHash = getTradeHash( _maker, _makerCardId, _taker, _takerCardOrChecklistId, _salt ); require(tradeStates[tradeHash] == TradeState.Valid, "This trade has already been cancelled or filled."); tradeStates[tradeHash] = TradeState.Cancelled; emit TradeCancelled(tradeHash, _maker); } /// @dev Calculates Keccak-256 hash of a trade with specified parameters. /// @param _maker Address of the maker (i.e. trade creator). /// @param _makerCardId ID of the card the maker has agreed to give up. /// @param _taker The counterparty the maker wishes to trade with (if it's address(0), anybody can fill the trade!) /// @param _takerCardOrChecklistId If taker is the 0-address, then this is a checklist ID (e.g. "any Lionel Messi"). /// If not, then it's a card ID (e.g. "Lionel Messi #8/100"). /// @param _salt A uint256 timestamp to differentiate trades that have otherwise identical params (prevents replay attacks). /// @return Keccak-256 hash of trade. function getTradeHash( address _maker, uint256 _makerCardId, address _taker, uint256 _takerCardOrChecklistId, uint256 _salt) public view returns (bytes32) { // Hashing the contract address prevents a trade from being replayed on any new trade contract we deploy. bytes memory packed = abi.encodePacked(this, _maker, _makerCardId, _taker, _takerCardOrChecklistId, _salt); return keccak256(packed); } /// @dev Verifies that a signed trade is valid. /// @param _signer Address of signer. /// @param _tradeHash Signed Keccak-256 hash. /// @param _v ECDSA signature parameter v. /// @param _r ECDSA signature parameters r. /// @param _s ECDSA signature parameters s. /// @return Validity of signature. function isValidSignature( address _signer, bytes32 _tradeHash, uint8 _v, bytes32 _r, bytes32 _s) public pure returns (bool) { bytes memory packed = abi.encodePacked("\x19Ethereum Signed Message:\n32", _tradeHash); return _signer == ecrecover(keccak256(packed), _v, _r, _s); } } /// @title The main, ERC721-compliant CryptoStrikers contract. /// @author The CryptoStrikers Team contract StrikersCore is StrikersTrading { /// @dev An external metadata contract that the owner can upgrade. StrikersMetadata public strikersMetadata; /// @dev We initialize the CryptoStrikers game with an immutable checklist that oversees card rarity. constructor(address _checklistAddress) public { strikersChecklist = StrikersChecklist(_checklistAddress); } /// @dev Allows the contract owner to update the metadata contract. function setMetadataAddress(address _contractAddress) external onlyOwner { strikersMetadata = StrikersMetadata(_contractAddress); } /// @dev If we've set an external metadata contract, use that. function tokenURI(uint256 _tokenId) public view returns (string) { if (strikersMetadata == address(0)) { return super.tokenURI(_tokenId); } require(exists(_tokenId), "Card does not exist."); return strikersMetadata.tokenURI(_tokenId); } }
Contract Security Audit
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Contract Creation Code
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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)
000000000000000000000000dbc260a05f81629ffa062df3d1668a43133abba4
-----Decoded View---------------
Arg [0] : _checklistAddress (address): 0xDBc260a05F81629FfA062Df3d1668A43133AbbA4
-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 000000000000000000000000dbc260a05f81629ffa062df3d1668a43133abba4
Swarm Source
bzzr://18fd0ecf06cd11ede612e0ec43bd59ac29e2d96ae3b6bd1a7f6f645f054e5307
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