Feature Tip: Add private address tag to any address under My Name Tag !
ERC-721
NFT
Overview
Max Total Supply
6,207 CC
Holders
402
Market
Volume (24H)
N/A
Min Price (24H)
N/A
Max Price (24H)
N/A
Other Info
Token Contract
Balance
20 CCLoading...
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# | Exchange | Pair | Price | 24H Volume | % Volume |
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Contract Name:
CryptantCrabNFT
Compiler Version
v0.4.24+commit.e67f0147
Optimization Enabled:
Yes with 200 runs
Other Settings:
default evmVersion
Contract Source Code (Solidity)
/** *Submitted for verification at Etherscan.io on 2018-10-25 */ pragma solidity 0.4.24; /** * @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) { // Gas optimization: this is cheaper than asserting 'a' not being zero, but the // benefit is lost if 'b' is also tested. // See: https://github.com/OpenZeppelin/openzeppelin-solidity/pull/522 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. // solium-disable-next-line security/no-inline-assembly assembly { size := extcodesize(addr) } return size > 0; } } /** * @title ERC165 * @dev https://github.com/ethereum/EIPs/blob/master/EIPS/eip-165.md */ interface ERC165 { /** * @notice Query if a contract implements an interface * @param _interfaceId The interface identifier, as specified in ERC-165 * @dev Interface identification is specified in ERC-165. This function * uses less than 30,000 gas. */ function supportsInterface(bytes4 _interfaceId) external view returns (bool); } /** * @title SupportsInterfaceWithLookup * @author Matt Condon (@shrugs) * @dev Implements ERC165 using a lookup table. */ contract SupportsInterfaceWithLookup is ERC165 { bytes4 public constant InterfaceId_ERC165 = 0x01ffc9a7; /** * 0x01ffc9a7 === * bytes4(keccak256('supportsInterface(bytes4)')) */ /** * @dev a mapping of interface id to whether or not it's supported */ mapping(bytes4 => bool) internal supportedInterfaces; /** * @dev A contract implementing SupportsInterfaceWithLookup * implement ERC165 itself */ constructor() public { _registerInterface(InterfaceId_ERC165); } /** * @dev implement supportsInterface(bytes4) using a lookup table */ function supportsInterface(bytes4 _interfaceId) external view returns (bool) { return supportedInterfaces[_interfaceId]; } /** * @dev private method for registering an interface */ function _registerInterface(bytes4 _interfaceId) internal { require(_interfaceId != 0xffffffff); supportedInterfaces[_interfaceId] = true; } } /** * @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,address,uint256,bytes)"))`, * which can be also obtained as `ERC721Receiver(0).onERC721Received.selector` */ bytes4 internal constant ERC721_RECEIVED = 0x150b7a02; /** * @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. Return of other than the magic value MUST result in the * transaction being reverted. * Note: the contract address is always the message sender. * @param _operator The address which called `safeTransferFrom` function * @param _from The address which previously owned the token * @param _tokenId The NFT identifier which is being transfered * @param _data Additional data with no specified format * @return `bytes4(keccak256("onERC721Received(address,address,uint256,bytes)"))` */ function onERC721Received( address _operator, address _from, uint256 _tokenId, bytes _data ) public returns(bytes4); } /** * @title ERC721 Non-Fungible Token Standard basic interface * @dev see https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md */ contract ERC721Basic is ERC165 { event Transfer( address indexed _from, address indexed _to, uint256 indexed _tokenId ); event Approval( address indexed _owner, address indexed _approved, uint256 indexed _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 ERC721 Non-Fungible Token Standard basic implementation * @dev see https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md */ contract ERC721BasicToken is SupportsInterfaceWithLookup, ERC721Basic { bytes4 private constant InterfaceId_ERC721 = 0x80ac58cd; /* * 0x80ac58cd === * bytes4(keccak256('balanceOf(address)')) ^ * bytes4(keccak256('ownerOf(uint256)')) ^ * bytes4(keccak256('approve(address,uint256)')) ^ * bytes4(keccak256('getApproved(uint256)')) ^ * bytes4(keccak256('setApprovalForAll(address,bool)')) ^ * bytes4(keccak256('isApprovedForAll(address,address)')) ^ * bytes4(keccak256('transferFrom(address,address,uint256)')) ^ * bytes4(keccak256('safeTransferFrom(address,address,uint256)')) ^ * bytes4(keccak256('safeTransferFrom(address,address,uint256,bytes)')) */ bytes4 private constant InterfaceId_ERC721Exists = 0x4f558e79; /* * 0x4f558e79 === * bytes4(keccak256('exists(uint256)')) */ using SafeMath for uint256; using AddressUtils for address; // Equals to `bytes4(keccak256("onERC721Received(address,address,uint256,bytes)"))` // which can be also obtained as `ERC721Receiver(0).onERC721Received.selector` bytes4 private constant ERC721_RECEIVED = 0x150b7a02; // 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)); _; } constructor() public { // register the supported interfaces to conform to ERC721 via ERC165 _registerInterface(InterfaceId_ERC721); _registerInterface(InterfaceId_ERC721Exists); } /** * @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 existence 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 * The zero address indicates there is no approved address. * There can only be one approved address per token at a given time. * 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)); 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 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 * 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 * Usage of this method is discouraged, use `safeTransferFrom` whenever possible * 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 * 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,address,uint256,bytes)"))`; otherwise, * the transfer is reverted. * * 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 * 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,address,uint256,bytes)"))`; otherwise, * the transfer is reverted. * 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); // Disable solium check because of // https://github.com/duaraghav8/Solium/issues/175 // solium-disable-next-line operator-whitespace return ( _spender == owner || getApproved(_tokenId) == _spender || isApprovedForAll(owner, _spender) ); } /** * @dev Internal function to mint a new token * 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 * 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 * 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); } } /** * @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 * 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( msg.sender, _from, _tokenId, _data); return (retval == ERC721_RECEIVED); } } /** * @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() external view returns (string _name); function symbol() external 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 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 SupportsInterfaceWithLookup, ERC721BasicToken, ERC721 { bytes4 private constant InterfaceId_ERC721Enumerable = 0x780e9d63; /** * 0x780e9d63 === * bytes4(keccak256('totalSupply()')) ^ * bytes4(keccak256('tokenOfOwnerByIndex(address,uint256)')) ^ * bytes4(keccak256('tokenByIndex(uint256)')) */ bytes4 private constant InterfaceId_ERC721Metadata = 0x5b5e139f; /** * 0x5b5e139f === * bytes4(keccak256('name()')) ^ * bytes4(keccak256('symbol()')) ^ * bytes4(keccak256('tokenURI(uint256)')) */ // 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 */ constructor(string _name, string _symbol) public { name_ = _name; symbol_ = _symbol; // register the supported interfaces to conform to ERC721 via ERC165 _registerInterface(InterfaceId_ERC721Enumerable); _registerInterface(InterfaceId_ERC721Metadata); } /** * @dev Gets the token name * @return string representing the token name */ function name() external view returns (string) { return name_; } /** * @dev Gets the token symbol * @return string representing the token symbol */ function symbol() external view returns (string) { return symbol_; } /** * @dev Returns an URI for a given token ID * 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 * 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 * 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 * 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 * 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 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 OwnershipRenounced(address indexed previousOwner); event OwnershipTransferred( address indexed previousOwner, address indexed newOwner ); /** * @dev The Ownable constructor sets the original `owner` of the contract to the sender * account. */ constructor() 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 relinquish control of the contract. * @notice Renouncing to ownership will leave the contract without an owner. * It will not be possible to call the functions with the `onlyOwner` * modifier anymore. */ function renounceOwnership() public onlyOwner { emit OwnershipRenounced(owner); owner = address(0); } /** * @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 { _transferOwnership(_newOwner); } /** * @dev Transfers control of the contract to a newOwner. * @param _newOwner The address to transfer ownership to. */ function _transferOwnership(address _newOwner) internal { require(_newOwner != address(0)); emit OwnershipTransferred(owner, _newOwner); owner = _newOwner; } } /** * @title Roles * @author Francisco Giordano (@frangio) * @dev Library for managing addresses assigned to a Role. * See RBAC.sol for example usage. */ library Roles { struct Role { mapping (address => bool) bearer; } /** * @dev give an address access to this role */ function add(Role storage role, address addr) internal { role.bearer[addr] = true; } /** * @dev remove an address' access to this role */ function remove(Role storage role, address addr) internal { role.bearer[addr] = false; } /** * @dev check if an address has this role * // reverts */ function check(Role storage role, address addr) view internal { require(has(role, addr)); } /** * @dev check if an address has this role * @return bool */ function has(Role storage role, address addr) view internal returns (bool) { return role.bearer[addr]; } } /** * @title RBAC (Role-Based Access Control) * @author Matt Condon (@Shrugs) * @dev Stores and provides setters and getters for roles and addresses. * Supports unlimited numbers of roles and addresses. * See //contracts/mocks/RBACMock.sol for an example of usage. * This RBAC method uses strings to key roles. It may be beneficial * for you to write your own implementation of this interface using Enums or similar. * It's also recommended that you define constants in the contract, like ROLE_ADMIN below, * to avoid typos. */ contract RBAC { using Roles for Roles.Role; mapping (string => Roles.Role) private roles; event RoleAdded(address indexed operator, string role); event RoleRemoved(address indexed operator, string role); /** * @dev reverts if addr does not have role * @param _operator address * @param _role the name of the role * // reverts */ function checkRole(address _operator, string _role) view public { roles[_role].check(_operator); } /** * @dev determine if addr has role * @param _operator address * @param _role the name of the role * @return bool */ function hasRole(address _operator, string _role) view public returns (bool) { return roles[_role].has(_operator); } /** * @dev add a role to an address * @param _operator address * @param _role the name of the role */ function addRole(address _operator, string _role) internal { roles[_role].add(_operator); emit RoleAdded(_operator, _role); } /** * @dev remove a role from an address * @param _operator address * @param _role the name of the role */ function removeRole(address _operator, string _role) internal { roles[_role].remove(_operator); emit RoleRemoved(_operator, _role); } /** * @dev modifier to scope access to a single role (uses msg.sender as addr) * @param _role the name of the role * // reverts */ modifier onlyRole(string _role) { checkRole(msg.sender, _role); _; } /** * @dev modifier to scope access to a set of roles (uses msg.sender as addr) * @param _roles the names of the roles to scope access to * // reverts * * @TODO - when solidity supports dynamic arrays as arguments to modifiers, provide this * see: https://github.com/ethereum/solidity/issues/2467 */ // modifier onlyRoles(string[] _roles) { // bool hasAnyRole = false; // for (uint8 i = 0; i < _roles.length; i++) { // if (hasRole(msg.sender, _roles[i])) { // hasAnyRole = true; // break; // } // } // require(hasAnyRole); // _; // } } /** * @title Whitelist * @dev The Whitelist contract has a whitelist of addresses, and provides basic authorization control functions. * This simplifies the implementation of "user permissions". */ contract Whitelist is Ownable, RBAC { string public constant ROLE_WHITELISTED = "whitelist"; /** * @dev Throws if operator is not whitelisted. * @param _operator address */ modifier onlyIfWhitelisted(address _operator) { checkRole(_operator, ROLE_WHITELISTED); _; } /** * @dev add an address to the whitelist * @param _operator address * @return true if the address was added to the whitelist, false if the address was already in the whitelist */ function addAddressToWhitelist(address _operator) onlyOwner public { addRole(_operator, ROLE_WHITELISTED); } /** * @dev getter to determine if address is in whitelist */ function whitelist(address _operator) public view returns (bool) { return hasRole(_operator, ROLE_WHITELISTED); } /** * @dev add addresses to the whitelist * @param _operators addresses * @return true if at least one address was added to the whitelist, * false if all addresses were already in the whitelist */ function addAddressesToWhitelist(address[] _operators) onlyOwner public { for (uint256 i = 0; i < _operators.length; i++) { addAddressToWhitelist(_operators[i]); } } /** * @dev remove an address from the whitelist * @param _operator address * @return true if the address was removed from the whitelist, * false if the address wasn't in the whitelist in the first place */ function removeAddressFromWhitelist(address _operator) onlyOwner public { removeRole(_operator, ROLE_WHITELISTED); } /** * @dev remove addresses from the whitelist * @param _operators addresses * @return true if at least one address was removed from the whitelist, * false if all addresses weren't in the whitelist in the first place */ function removeAddressesFromWhitelist(address[] _operators) onlyOwner public { for (uint256 i = 0; i < _operators.length; i++) { removeAddressFromWhitelist(_operators[i]); } } } contract CrabData { modifier crabDataLength(uint256[] memory _crabData) { require(_crabData.length == 8); _; } struct CrabPartData { uint256 hp; uint256 dps; uint256 blockRate; uint256 resistanceBonus; uint256 hpBonus; uint256 dpsBonus; uint256 blockBonus; uint256 mutiplierBonus; } function arrayToCrabPartData( uint256[] _partData ) internal pure crabDataLength(_partData) returns (CrabPartData memory _parsedData) { _parsedData = CrabPartData( _partData[0], // hp _partData[1], // dps _partData[2], // block rate _partData[3], // resistance bonus _partData[4], // hp bonus _partData[5], // dps bonus _partData[6], // block bonus _partData[7]); // multiplier bonus } function crabPartDataToArray(CrabPartData _crabPartData) internal pure returns (uint256[] memory _resultData) { _resultData = new uint256[](8); _resultData[0] = _crabPartData.hp; _resultData[1] = _crabPartData.dps; _resultData[2] = _crabPartData.blockRate; _resultData[3] = _crabPartData.resistanceBonus; _resultData[4] = _crabPartData.hpBonus; _resultData[5] = _crabPartData.dpsBonus; _resultData[6] = _crabPartData.blockBonus; _resultData[7] = _crabPartData.mutiplierBonus; } } contract GeneSurgeon { //0 - filler, 1 - body, 2 - leg, 3 - left claw, 4 - right claw uint256[] internal crabPartMultiplier = [0, 10**9, 10**6, 10**3, 1]; function extractElementsFromGene(uint256 _gene) internal view returns (uint256[] memory _elements) { _elements = new uint256[](4); _elements[0] = _gene / crabPartMultiplier[1] / 100 % 10; _elements[1] = _gene / crabPartMultiplier[2] / 100 % 10; _elements[2] = _gene / crabPartMultiplier[3] / 100 % 10; _elements[3] = _gene / crabPartMultiplier[4] / 100 % 10; } function extractPartsFromGene(uint256 _gene) internal view returns (uint256[] memory _parts) { _parts = new uint256[](4); _parts[0] = _gene / crabPartMultiplier[1] % 100; _parts[1] = _gene / crabPartMultiplier[2] % 100; _parts[2] = _gene / crabPartMultiplier[3] % 100; _parts[3] = _gene / crabPartMultiplier[4] % 100; } } contract CryptantCrabNFT is ERC721Token, Whitelist, CrabData, GeneSurgeon { event CrabPartAdded(uint256 hp, uint256 dps, uint256 blockAmount); event GiftTransfered(address indexed _from, address indexed _to, uint256 indexed _tokenId); event DefaultMetadataURIChanged(string newUri); /** * @dev Pre-generated keys to save gas * keys are generated with: * CRAB_BODY = bytes4(keccak256("crab_body")) = 0xc398430e * CRAB_LEG = bytes4(keccak256("crab_leg")) = 0x889063b1 * CRAB_LEFT_CLAW = bytes4(keccak256("crab_left_claw")) = 0xdb6290a2 * CRAB_RIGHT_CLAW = bytes4(keccak256("crab_right_claw")) = 0x13453f89 */ bytes4 internal constant CRAB_BODY = 0xc398430e; bytes4 internal constant CRAB_LEG = 0x889063b1; bytes4 internal constant CRAB_LEFT_CLAW = 0xdb6290a2; bytes4 internal constant CRAB_RIGHT_CLAW = 0x13453f89; /** * @dev Stores all the crab data */ mapping(bytes4 => mapping(uint256 => CrabPartData[])) internal crabPartData; /** * @dev Mapping from tokenId to its corresponding special skin * tokenId with default skin will not be stored. */ mapping(uint256 => uint256) internal crabSpecialSkins; /** * @dev default MetadataURI */ string public defaultMetadataURI = "https://www.cryptantcrab.io/md/"; constructor(string _name, string _symbol) public ERC721Token(_name, _symbol) { // constructor initiateCrabPartData(); } /** * @dev Returns an URI for a given token ID * Throws if the token ID does not exist. * Will return the token's metadata URL if it has one, * otherwise will just return base on the default metadata URI * @param _tokenId uint256 ID of the token to query */ function tokenURI(uint256 _tokenId) public view returns (string) { require(exists(_tokenId)); string memory _uri = tokenURIs[_tokenId]; if(bytes(_uri).length == 0) { _uri = getMetadataURL(bytes(defaultMetadataURI), _tokenId); } return _uri; } /** * @dev Returns the data of a specific parts * @param _partIndex the part to retrieve. 1 = Body, 2 = Legs, 3 = Left Claw, 4 = Right Claw * @param _element the element of part to retrieve. 1 = Fire, 2 = Earth, 3 = Metal, 4 = Spirit, 5 = Water * @param _setIndex the set index of for the specified part. This will starts from 1. */ function dataOfPart(uint256 _partIndex, uint256 _element, uint256 _setIndex) public view returns (uint256[] memory _resultData) { bytes4 _key; if(_partIndex == 1) { _key = CRAB_BODY; } else if(_partIndex == 2) { _key = CRAB_LEG; } else if(_partIndex == 3) { _key = CRAB_LEFT_CLAW; } else if(_partIndex == 4) { _key = CRAB_RIGHT_CLAW; } else { revert(); } CrabPartData storage _crabPartData = crabPartData[_key][_element][_setIndex]; _resultData = crabPartDataToArray(_crabPartData); } /** * @dev Gift(Transfer) a token to another address. Caller must be token owner * @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 giftToken(address _from, address _to, uint256 _tokenId) external { safeTransferFrom(_from, _to, _tokenId); emit GiftTransfered(_from, _to, _tokenId); } /** * @dev External function to mint a new token, for whitelisted address only. * Reverts if the given token ID already exists * @param _tokenOwner address the beneficiary that will own the minted token * @param _tokenId uint256 ID of the token to be minted by the msg.sender * @param _skinId the skin ID to be applied for all the token minted */ function mintToken(address _tokenOwner, uint256 _tokenId, uint256 _skinId) external onlyIfWhitelisted(msg.sender) { super._mint(_tokenOwner, _tokenId); if(_skinId > 0) { crabSpecialSkins[_tokenId] = _skinId; } } /** * @dev Returns crab data base on the gene provided * @param _gene the gene info where crab data will be retrieved base on it * @return 4 uint arrays: * 1st Array = Body's Data * 2nd Array = Leg's Data * 3rd Array = Left Claw's Data * 4th Array = Right Claw's Data */ function crabPartDataFromGene(uint256 _gene) external view returns ( uint256[] _bodyData, uint256[] _legData, uint256[] _leftClawData, uint256[] _rightClawData ) { uint256[] memory _parts = extractPartsFromGene(_gene); uint256[] memory _elements = extractElementsFromGene(_gene); _bodyData = dataOfPart(1, _elements[0], _parts[0]); _legData = dataOfPart(2, _elements[1], _parts[1]); _leftClawData = dataOfPart(3, _elements[2], _parts[2]); _rightClawData = dataOfPart(4, _elements[3], _parts[3]); } /** * @dev For developer to add new parts, notice that this is the only method to add crab data * so that developer can add extra content. there's no other method for developer to modify * the data. This is to assure token owner actually owns their data. * @param _partIndex the part to add. 1 = Body, 2 = Legs, 3 = Left Claw, 4 = Right Claw * @param _element the element of part to add. 1 = Fire, 2 = Earth, 3 = Metal, 4 = Spirit, 5 = Water * @param _partDataArray data of the parts. */ function setPartData(uint256 _partIndex, uint256 _element, uint256[] _partDataArray) external onlyOwner { CrabPartData memory _partData = arrayToCrabPartData(_partDataArray); bytes4 _key; if(_partIndex == 1) { _key = CRAB_BODY; } else if(_partIndex == 2) { _key = CRAB_LEG; } else if(_partIndex == 3) { _key = CRAB_LEFT_CLAW; } else if(_partIndex == 4) { _key = CRAB_RIGHT_CLAW; } // if index 1 is empty will fill at index 1 if(crabPartData[_key][_element][1].hp == 0 && crabPartData[_key][_element][1].dps == 0) { crabPartData[_key][_element][1] = _partData; } else { crabPartData[_key][_element].push(_partData); } emit CrabPartAdded(_partDataArray[0], _partDataArray[1], _partDataArray[2]); } /** * @dev Updates the default metadata URI * @param _defaultUri the new metadata URI */ function setDefaultMetadataURI(string _defaultUri) external onlyOwner { defaultMetadataURI = _defaultUri; emit DefaultMetadataURIChanged(_defaultUri); } /** * @dev Updates the metadata URI for existing token * @param _tokenId the tokenID that metadata URI to be changed * @param _uri the new metadata URI for the specified token */ function setTokenURI(uint256 _tokenId, string _uri) external onlyIfWhitelisted(msg.sender) { _setTokenURI(_tokenId, _uri); } /** * @dev Returns the special skin of the provided tokenId * @param _tokenId cryptant crab's tokenId * @return Special skin belongs to the _tokenId provided. * 0 will be returned if no special skin found. */ function specialSkinOfTokenId(uint256 _tokenId) external view returns (uint256) { return crabSpecialSkins[_tokenId]; } /** * @dev This functions will adjust the length of crabPartData * so that when adding data the index can start with 1. * Reason of doing this is because gene cannot have parts with index 0. */ function initiateCrabPartData() internal { require(crabPartData[CRAB_BODY][1].length == 0); for(uint256 i = 1 ; i <= 5 ; i++) { crabPartData[CRAB_BODY][i].length = 2; crabPartData[CRAB_LEG][i].length = 2; crabPartData[CRAB_LEFT_CLAW][i].length = 2; crabPartData[CRAB_RIGHT_CLAW][i].length = 2; } } /** * @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, * or has been whitelisted by contract owner */ function isApprovedOrOwner(address _spender, uint256 _tokenId) internal view returns (bool) { address owner = ownerOf(_tokenId); return _spender == owner || getApproved(_tokenId) == _spender || isApprovedForAll(owner, _spender) || whitelist(_spender); } /** * @dev Will merge the uri and tokenId together. * @param _uri URI to be merge. This will be the first part of the result URL. * @param _tokenId tokenID to be merge. This will be the last part of the result URL. * @return the merged urL */ function getMetadataURL(bytes _uri, uint256 _tokenId) internal pure returns (string) { uint256 _tmpTokenId = _tokenId; uint256 _tokenLength; // Getting the length(number of digits) of token ID do { _tokenLength++; _tmpTokenId /= 10; } while (_tmpTokenId > 0); // creating a byte array with the length of URL + token digits bytes memory _result = new bytes(_uri.length + _tokenLength); // cloning the uri bytes into the result bytes for(uint256 i = 0 ; i < _uri.length ; i ++) { _result[i] = _uri[i]; } // appending the tokenId to the end of the result bytes uint256 lastIndex = _result.length - 1; for(_tmpTokenId = _tokenId ; _tmpTokenId > 0 ; _tmpTokenId /= 10) { _result[lastIndex--] = byte(48 + _tmpTokenId % 10); } return string(_result); } }
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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)
00000000000000000000000000000000000000000000000000000000000000400000000000000000000000000000000000000000000000000000000000000080000000000000000000000000000000000000000000000000000000000000000d4372797074616e7420437261620000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000024343000000000000000000000000000000000000000000000000000000000000
-----Decoded View---------------
Arg [0] : _name (string): Cryptant Crab
Arg [1] : _symbol (string): CC
-----Encoded View---------------
6 Constructor Arguments found :
Arg [0] : 0000000000000000000000000000000000000000000000000000000000000040
Arg [1] : 0000000000000000000000000000000000000000000000000000000000000080
Arg [2] : 000000000000000000000000000000000000000000000000000000000000000d
Arg [3] : 4372797074616e74204372616200000000000000000000000000000000000000
Arg [4] : 0000000000000000000000000000000000000000000000000000000000000002
Arg [5] : 4343000000000000000000000000000000000000000000000000000000000000
Swarm Source
bzzr://917211784d735b8f5264b3e1acdec385367f2276bcb4905e717f8c8268cd85e6
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