Contract

/**
 *Submitted for verification at Etherscan.io on 2018-08-28
*/

pragma solidity ^0.4.11;

interface CommonWallet {
    function receive() external payable;
}

library StringUtils {
    function concat(string _a, string _b)
        internal
        pure
        returns (string)
    {
        bytes memory _ba = bytes(_a);
        bytes memory _bb = bytes(_b);

        bytes memory bab = new bytes(_ba.length + _bb.length);
        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);
    }
}

library UintStringUtils {
    function toString(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 AddressUtils
// @dev 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 SafeMath256
 // @dev Math operations with safety checks that throw on error
library SafeMath256 {

  // @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;
  }
}

library SafeMath32 {
  // @dev Multiplies two numbers, throws on overflow.
  function mul(uint32 a, uint32 b) internal pure returns (uint32 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(uint32 a, uint32 b) internal pure returns (uint32) {
    // assert(b > 0); // Solidity automatically throws when dividing by 0
    // uint32 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(uint32 a, uint32 b) internal pure returns (uint32) {
    assert(b <= a);
    return a - b;
  }


  // @dev Adds two numbers, throws on overflow.
  function add(uint32 a, uint32 b) internal pure returns (uint32 c) {
    c = a + b;
    assert(c >= a);
    return c;
  }
}

library SafeMath8 {
  // @dev Multiplies two numbers, throws on overflow.
  function mul(uint8 a, uint8 b) internal pure returns (uint8 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(uint8 a, uint8 b) internal pure returns (uint8) {
    // assert(b > 0); // Solidity automatically throws when dividing by 0
    // uint8 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(uint8 a, uint8 b) internal pure returns (uint8) {
    assert(b <= a);
    return a - b;
  }


  // @dev Adds two numbers, throws on overflow.
  function add(uint8 a, uint8 b) internal pure returns (uint8 c) {
    c = a + b;
    assert(c >= a);
    return c;
  }
}

/// @title A facet of DragonCore that manages special access privileges.
contract DragonAccessControl 
{
    // @dev Non Assigned address.
    address constant NA = address(0);

    /// @dev Contract owner
    address internal controller_;

    /// @dev Contract modes
    enum Mode {TEST, PRESALE, OPERATE}

    /// @dev Contract state
    Mode internal mode_ = Mode.TEST;

    /// @dev OffChain Server accounts ('minions') addresses
    /// It's used for money withdrawal and export of tokens 
    mapping(address => bool) internal minions_;
    
    /// @dev Presale contract address. Can call `presale` method.
    address internal presale_;

    // Modifiers ---------------------------------------------------------------
    /// @dev Limit execution to controller account only.
    modifier controllerOnly() {
        require(controller_ == msg.sender, "controller_only");
        _;
    }

    /// @dev Limit execution to minion account only.
    modifier minionOnly() {
        require(minions_[msg.sender], "minion_only");
        _;
    }

    /// @dev Limit execution to test time only.
    modifier testModeOnly {
        require(mode_ == Mode.TEST, "test_mode_only");
        _;
    }

    /// @dev Limit execution to presale time only.
    modifier presaleModeOnly {
        require(mode_ == Mode.PRESALE, "presale_mode_only");
        _;
    }

    /// @dev Limit execution to operate time only.
    modifier operateModeOnly {
        require(mode_ == Mode.OPERATE, "operate_mode_only");
        _;
    }

     /// @dev Limit execution to presale account only.
    modifier presaleOnly() {
        require(msg.sender == presale_, "presale_only");
        _;
    }

    /// @dev set state to Mode.OPERATE.
    function setOperateMode()
        external 
        controllerOnly
        presaleModeOnly
    {
        mode_ = Mode.OPERATE;
    }

    /// @dev Set presale contract address. Becomes useless when presale is over.
    /// @param _presale Presale contract address.
    function setPresale(address _presale)
        external
        controllerOnly
    {
        presale_ = _presale;
    }

    /// @dev set state to Mode.PRESALE.
    function setPresaleMode()
        external
        controllerOnly
        testModeOnly
    {
        mode_ = Mode.PRESALE;
    }    

        /// @dev Get controller address.
    /// @return Address of contract's controller.
    function controller()
        external
        view
        returns(address)
    {
        return controller_;
    }

    /// @dev Transfer control to new address. Set controller an approvee for
    /// tokens that managed by contract itself. Remove previous controller value
    /// from contract's approvees.
    /// @param _to New controller address.
    function setController(address _to)
        external
        controllerOnly
    {
        require(_to != NA, "_to");
        require(controller_ != _to, "already_controller");

        controller_ = _to;
    }

    /// @dev Check if address is a minion.
    /// @param _addr Address to check.
    /// @return True if address is a minion.
    function isMinion(address _addr)
        public view returns(bool)
    {
        return minions_[_addr];
    }   

    function getCurrentMode() 
        public view returns (Mode) 
    {
        return mode_;
    }    
}

/// @dev token description, storage and transfer functions
contract DragonBase is DragonAccessControl
{
    using SafeMath8 for uint8;
    using SafeMath32 for uint32;
    using SafeMath256 for uint256;
    using StringUtils for string;
    using UintStringUtils for uint;    

    /// @dev The Birth event is fired whenever a new dragon comes into existence. 
    event Birth(address owner, uint256 petId, uint256 tokenId, uint256 parentA, uint256 parentB, string genes, string params);

    /// @dev Token name
    string internal name_;
    /// @dev Token symbol
    string internal symbol_;
    /// @dev Token resolving url
    string internal url_;

    struct DragonToken {
        // Constant Token params
        uint8   genNum;  // generation number. uses for dragon view
        string  genome;  // genome description
        uint256 petId;   // offchain dragon identifier

        // Parents
        uint256 parentA;
        uint256 parentB;

        // Game-depening Token params
        string  params;  // can change in export operation

        // State
        address owner; 
    }

    /// @dev Count of minted tokens
    uint256 internal mintCount_;
    /// @dev Maximum token supply
    uint256 internal maxSupply_;
     /// @dev Count of burn tokens
    uint256 internal burnCount_;

    // Tokens state
    /// @dev Token approvals values
    mapping(uint256 => address) internal approvals_;
    /// @dev Operator approvals
    mapping(address => mapping(address => bool)) internal operatorApprovals_;
    /// @dev Index of token in owner's token list
    mapping(uint256 => uint256) internal ownerIndex_;
    /// @dev Owner's tokens list
    mapping(address => uint256[]) internal ownTokens_;
    /// @dev Tokens
    mapping(uint256 => DragonToken) internal tokens_;

    // @dev Non Assigned address.
    address constant NA = address(0);

    /// @dev Add token to new owner. Increase owner's balance.
    /// @param _to Token receiver.
    /// @param _tokenId New token id.
    function _addTo(address _to, uint256 _tokenId)
        internal
    {
        DragonToken storage token = tokens_[_tokenId];
        require(token.owner == NA, "taken");

        uint256 lastIndex = ownTokens_[_to].length;
        ownTokens_[_to].push(_tokenId);
        ownerIndex_[_tokenId] = lastIndex;

        token.owner = _to;
    }

    /// @dev Create new token and increase mintCount.
    /// @param _genome New token's genome.
    /// @param _params Token params string. 
    /// @param _parentA Token A parent.
    /// @param _parentB Token B parent.
    /// @return New token id.
    function _createToken(
        address _to,
        
        // Constant Token params
        uint8   _genNum,
        string   _genome,
        uint256 _parentA,
        uint256 _parentB,
        
        // Game-depening Token params
        uint256 _petId,
        string   _params        
    )
        internal returns(uint256)
    {
        uint256 tokenId = mintCount_.add(1);
        mintCount_ = tokenId;

        DragonToken memory token = DragonToken(
            _genNum,
            _genome,
            _petId,

            _parentA,
            _parentB,

            _params,
            NA
        );
        
        tokens_[tokenId] = token;
        
        _addTo(_to, tokenId);
        
        emit Birth(_to, _petId, tokenId, _parentA, _parentB, _genome, _params);
        
        return tokenId;
    }    
 
    /// @dev Get token genome.
    /// @param _tokenId Token id.
    /// @return Token's genome.
    function getGenome(uint256 _tokenId)
        external view returns(string)
    {
        return tokens_[_tokenId].genome;
    }

    /// @dev Get token params.
    /// @param _tokenId Token id.
    /// @return Token's params.
    function getParams(uint256 _tokenId)
        external view returns(string)
    {
        return tokens_[_tokenId].params;
    }

    /// @dev Get token parentA.
    /// @param _tokenId Token id.
    /// @return Parent token id.
    function getParentA(uint256 _tokenId)
        external view returns(uint256)
    {
        return tokens_[_tokenId].parentA;
    }   

    /// @dev Get token parentB.
    /// @param _tokenId Token id.
    /// @return Parent token id.
    function getParentB(uint256 _tokenId)
        external view returns(uint256)
    {
        return tokens_[_tokenId].parentB;
    }

    /// @dev Check if `_tokenId` exists. Check if owner is not addres(0).
    /// @param _tokenId Token id
    /// @return Return true if token owner is real.
    function isExisting(uint256 _tokenId)
        public view returns(bool)
    {
        return tokens_[_tokenId].owner != NA;
    }    

    /// @dev Receive maxium token supply value.
    /// @return Contracts `maxSupply_` variable.
    function maxSupply()
        external view returns(uint256)
    {
        return maxSupply_;
    }

    /// @dev Set url prefix for tokenURI generation.
    /// @param _url Url prefix value.
    function setUrl(string _url)
        external controllerOnly
    {
        url_ = _url;
    }

    /// @dev Get token symbol.
    /// @return Token symbol name.
    function symbol()
        external view returns(string)
    {
        return symbol_;
    }

    /// @dev Get token URI to receive offchain information by it's id.
    /// @param _tokenId Token id.
    /// @return URL string. For example "http://erc721.tld/tokens/1".
    function tokenURI(uint256 _tokenId)
        external view returns(string)
    {
        return url_.concat(_tokenId.toString());
    }

     /// @dev Get token name.
    /// @return Token name string.
    function name()
        external view returns(string)
    {
        return name_;
    }

    /// @dev return information about _owner tokens
    function getTokens(address _owner)
        external view  returns (uint256[], uint256[], byte[]) 
    {
        uint256[] memory tokens = ownTokens_[_owner];
        uint256[] memory tokenIds = new uint256[](tokens.length);
        uint256[] memory petIds = new uint256[](tokens.length);

        byte[] memory genomes = new byte[](tokens.length * 77);
        uint index = 0;

        for(uint i = 0; i < tokens.length; i++) {
            uint256 tokenId = tokens[i];
            
            DragonToken storage token = tokens_[tokenId];

            tokenIds[i] = tokenId;
            petIds[i] = token.petId;
            
            bytes storage genome = bytes(token.genome);
            
            for(uint j = 0; j < genome.length; j++) {
                genomes[index++] = genome[j];
            }
        }
        return (tokenIds, petIds, genomes);
    }
    
}

/// @title Interface for contracts conforming to ERC-721: Non-Fungible Tokens
/// @dev See https://github.com/OpenZeppelin/openzeppelin-solidity/blob/master/contracts/token/ERC721/ERC721.sol

contract ERC721Basic 
{
    /// @dev Emitted when token approvee is set
    event Approval(address indexed _owner, address indexed _approved, uint256 _tokenId);
    /// @dev Emitted when owner approve all own tokens to operator.
    event ApprovalForAll(address indexed _owner, address indexed _operator, bool _approved);
    /// @dev Emitted when user deposit some funds.
    event Deposit(address indexed _sender, uint256 _value);
    /// @dev Emitted when user deposit some funds.
    event Withdraw(address indexed _sender, uint256 _value);
    /// @dev Emitted when token transferred to new owner
    event Transfer(address indexed _from, address indexed _to, uint256 _tokenId);

    // Required methods
    function balanceOf(address _owner) external 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) external;
    function getApproved(uint256 _tokenId) public view returns (address _to);

    //function transfer(address _to, uint256 _tokenId) public;
    function transferFrom(address _from, address _to, uint256 _tokenId) public;

    function totalSupply() public view returns (uint256 total);

    // ERC-165 Compatibility (https://github.com/ethereum/EIPs/issues/165)
    function supportsInterface(bytes4 _interfaceID) external view returns (bool);
}

/**
 * @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) external view returns (string);
}


/**
 * @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 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, ERC721Metadata, ERC721Receiver 
{
    /// @dev Interface signature 721 for interface detection.
    bytes4 constant ERC721_RECEIVED = 0xf0b9e5ba;

    bytes4 constant InterfaceSignature_ERC165 = 0x01ffc9a7;
    /*
    bytes4(keccak256('supportsInterface(bytes4)'));
    */

    bytes4 constant InterfaceSignature_ERC721Enumerable = 0x780e9d63;
    /*
    bytes4(keccak256('totalSupply()')) ^
    bytes4(keccak256('tokenOfOwnerByIndex(address,uint256)')) ^
    bytes4(keccak256('tokenByIndex(uint256)'));
    */

    bytes4 constant InterfaceSignature_ERC721Metadata = 0x5b5e139f;
    /*
    bytes4(keccak256('name()')) ^
    bytes4(keccak256('symbol()')) ^
    bytes4(keccak256('tokenURI(uint256)'));
    */

    bytes4 constant InterfaceSignature_ERC721 = 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)'));
    */

    function supportsInterface(bytes4 _interfaceID) external view returns (bool)
    {
        return ((_interfaceID == InterfaceSignature_ERC165)
            || (_interfaceID == InterfaceSignature_ERC721)
            || (_interfaceID == InterfaceSignature_ERC721Enumerable)
            || (_interfaceID == InterfaceSignature_ERC721Metadata));
    }    
}

/// @dev ERC721 methods
contract DragonOwnership is ERC721, DragonBase
{
    using StringUtils for string;
    using UintStringUtils for uint;    
    using AddressUtils for address;

    /// @dev Emitted when token transferred to new owner. Additional fields is petId, genes, params
    /// it uses for client-side indication
    event TransferInfo(address indexed _from, address indexed _to, uint256 _tokenId, uint256 petId, string genes, string params);

    /// @dev Specify if _addr is token owner or approvee. Also check if `_addr`
    /// is operator for token owner.
    /// @param _tokenId Token to check ownership of.
    /// @param _addr Address to check if it's an owner or an aprovee of `_tokenId`.
    /// @return True if token can be managed by provided `_addr`.
    function isOwnerOrApproved(uint256 _tokenId, address _addr)
        public view returns(bool)
    {
        DragonToken memory token = tokens_[_tokenId];

        if (token.owner == _addr) {
            return true;
        }
        else if (isApprovedFor(_tokenId, _addr)) {
            return true;
        }
        else if (isApprovedForAll(token.owner, _addr)) {
            return true;
        }

        return false;
    }

    /// @dev Limit execution to token owner or approvee only.
    /// @param _tokenId Token to check ownership of.
    modifier ownerOrApprovedOnly(uint256 _tokenId) {
        require(isOwnerOrApproved(_tokenId, msg.sender), "tokenOwnerOrApproved_only");
        _;
    }

    /// @dev Contract's own token only acceptable.
    /// @param _tokenId Contract's token id.
    modifier ownOnly(uint256 _tokenId) {
        require(tokens_[_tokenId].owner == address(this), "own_only");
        _;
    }

    /// @dev Determine if token is approved for specified approvee.
    /// @param _tokenId Target token id.
    /// @param _approvee Approvee address.
    /// @return True if so.
    function isApprovedFor(uint256 _tokenId, address _approvee)
        public view returns(bool)
    {
        return approvals_[_tokenId] == _approvee;
    }

    /// @dev Specify is given address set as operator with setApprovalForAll.
    /// @param _owner Token owner.
    /// @param _operator Address to check if it an operator.
    /// @return True if operator is set.
    function isApprovedForAll(address _owner, address _operator)
        public view returns(bool)
    {
        return operatorApprovals_[_owner][_operator];
    }

    /// @dev Check if `_tokenId` exists. Check if owner is not addres(0).
    /// @param _tokenId Token id
    /// @return Return true if token owner is real.
    function exists(uint256 _tokenId)
        public view returns(bool)
    {
        return tokens_[_tokenId].owner != NA;
    }

    /// @dev Get owner of a token.
    /// @param _tokenId Token owner id.
    /// @return Token owner address.
    function ownerOf(uint256 _tokenId)
        public view returns(address)
    {
        return tokens_[_tokenId].owner;
    }

    /// @dev Get approvee address. If there is not approvee returns 0x0.
    /// @param _tokenId Token id to get approvee of.
    /// @return Approvee address or 0x0.
    function getApproved(uint256 _tokenId)
        public view returns(address)
    {
        return approvals_[_tokenId];
    }

    /// @dev Grant owner alike controll permissions to third party.
    /// @param _to Permission receiver.
    /// @param _tokenId Granted token id.
    function approve(address _to, uint256 _tokenId)
        external ownerOrApprovedOnly(_tokenId)
    {
        address owner = ownerOf(_tokenId);
        require(_to != owner);

        if (getApproved(_tokenId) != NA || _to != NA) {
            approvals_[_tokenId] = _to;

            emit Approval(owner, _to, _tokenId);
        }
    }

    /// @dev Current total tokens supply. Always less then maxSupply.
    /// @return Difference between minted and burned tokens.
    function totalSupply()
        public view returns(uint256)
    {
        return mintCount_;
    }    

    /// @dev Get number of tokens which `_owner` owns.
    /// @param _owner Address to count own tokens.
    /// @return Count of owned tokens.
    function balanceOf(address _owner)
        external view returns(uint256)
    {
        return ownTokens_[_owner].length;
    }    

    /// @dev Internal set approval for all without _owner check.
    /// @param _owner Granting user.
    /// @param _to New account approvee.
    /// @param _approved Set new approvee status.
    function _setApprovalForAll(address _owner, address _to, bool _approved)
        internal
    {
        operatorApprovals_[_owner][_to] = _approved;

        emit ApprovalForAll(_owner, _to, _approved);
    }

    /// @dev Set approval for all account tokens.
    /// @param _to Approvee address.
    /// @param _approved Value true or false.
    function setApprovalForAll(address _to, bool _approved)
        external
    {
        require(_to != msg.sender);

        _setApprovalForAll(msg.sender, _to, _approved);
    }

    /// @dev Remove approval bindings for token. Do nothing if no approval
    /// exists.
    /// @param _from Address of token owner.
    /// @param _tokenId Target token id.
    function _clearApproval(address _from, uint256 _tokenId)
        internal
    {
        if (approvals_[_tokenId] == NA) {
            return;
        }

        approvals_[_tokenId] = NA;
        emit Approval(_from, NA, _tokenId);
    }

    /// @dev Check if contract was received by other side properly if receiver
    /// is a ctontract.
    /// @param _from Current token owner.
    /// @param _to New token owner.
    /// @param _tokenId token Id.
    /// @param _data Transaction data.
    /// @return True on success.
    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);
    }

    /// @dev Remove token from owner. Unrecoverable.
    /// @param _tokenId Removing token id.
    function _remove(uint256 _tokenId)
        internal
    {
        address owner = tokens_[_tokenId].owner;
        _removeFrom(owner, _tokenId);
    }

    /// @dev Completely remove token from the contract. Unrecoverable.
    /// @param _owner Owner of removing token.
    /// @param _tokenId Removing token id.
    function _removeFrom(address _owner, uint256 _tokenId)
        internal
    {
        uint256 lastIndex = ownTokens_[_owner].length.sub(1);
        uint256 lastToken = ownTokens_[_owner][lastIndex];

        // Swap users token
        ownTokens_[_owner][ownerIndex_[_tokenId]] = lastToken;
        ownTokens_[_owner].length--;

        // Swap token indexes
        ownerIndex_[lastToken] = ownerIndex_[_tokenId];
        ownerIndex_[_tokenId] = 0;

        DragonToken storage token = tokens_[_tokenId];
        token.owner = NA;
    }

    /// @dev Transfer token from owner `_from` to another address or contract
    /// `_to` by it's `_tokenId`.
    /// @param _from Current token owner.
    /// @param _to New token owner.
    /// @param _tokenId token Id.
    function transferFrom( address _from, address _to, uint256 _tokenId )
        public ownerOrApprovedOnly(_tokenId)
    {
        require(_from != NA);
        require(_to != NA);

        _clearApproval(_from, _tokenId);
        _removeFrom(_from, _tokenId);
        _addTo(_to, _tokenId);

        emit Transfer(_from, _to, _tokenId);

        DragonToken storage token = tokens_[_tokenId];
        emit TransferInfo(_from, _to, _tokenId, token.petId, token.genome, token.params);
    }

    /// @dev Update token params and transfer to new owner. Only contract's own
    /// tokens could be updated. Also notifies receiver of the token.
    /// @param _to Address to transfer token to.
    /// @param _tokenId Id of token that should be transferred.
    /// @param _params New token params.
    function updateAndSafeTransferFrom(
        address _to,
        uint256 _tokenId,
        string _params
    )
        public
    {
        updateAndSafeTransferFrom(_to, _tokenId, _params, "");
    }

    /// @dev Update token params and transfer to new owner. Only contract's own
    /// tokens could be updated. Also notifies receiver of the token and send
    /// protion of _data to it.
    /// @param _to Address to transfer token to.
    /// @param _tokenId Id of token that should be transferred.
    /// @param _params New token params.
    /// @param _data Notification data.
    function updateAndSafeTransferFrom(
        address _to,
        uint256 _tokenId,
        string _params,
        bytes _data
    )
        public
    {
        // Safe transfer from
        updateAndTransferFrom(_to, _tokenId, _params, 0, 0);
        require(_checkAndCallSafeTransfer(address(this), _to, _tokenId, _data));
    }

    /// @dev Update token params and transfer to new owner. Only contract's own
    /// tokens could be updated.
    /// @param _to Address to transfer token to.
    /// @param _tokenId Id of token that should be transferred.
    /// @param _params New token params.
    function updateAndTransferFrom(
        address _to,
        uint256 _tokenId,
        string _params,
        uint256 _petId, 
        uint256 _transferCost
    )
        public
        ownOnly(_tokenId)
        minionOnly
    {
        require(bytes(_params).length > 0, "params_length");

        // Update
        tokens_[_tokenId].params = _params;
        if (tokens_[_tokenId].petId == 0 ) {
            tokens_[_tokenId].petId = _petId;
        }

        address from = tokens_[_tokenId].owner;

        // Transfer from
        transferFrom(from, _to, _tokenId);

        // send to the server's wallet the transaction cost
        // withdraw it from the balance of the contract. this amount must be withdrawn from the player
        // on the side of the game server        
        if (_transferCost > 0) {
            msg.sender.transfer(_transferCost);
        }
    }

    /// @dev Transfer token from one owner to new one and check if it was
    /// properly received if receiver is a contact.
    /// @param _from Current token owner.
    /// @param _to New token owner.
    /// @param _tokenId token Id.
    function safeTransferFrom(
        address _from,
        address _to,
        uint256 _tokenId
    )
        public
    {
        safeTransferFrom(_from, _to, _tokenId, "");
    }

    /// @dev Transfer token from one owner to new one and check if it was
    /// properly received if receiver is a contact.
    /// @param _from Current token owner.
    /// @param _to New token owner.
    /// @param _tokenId token Id.
    /// @param _data Transaction data.
    function safeTransferFrom(
        address _from,
        address _to,
        uint256 _tokenId,
        bytes _data
    )
        public
    {
        transferFrom(_from, _to, _tokenId);
        require(_checkAndCallSafeTransfer(_from, _to, _tokenId, _data));
    }

    /// @dev Burn owned token. Increases `burnCount_` and decrease `totalSupply`
    /// value.
    /// @param _tokenId Id of burning token.
    function burn(uint256 _tokenId)
        public
        ownerOrApprovedOnly(_tokenId)
    {
        address owner = tokens_[_tokenId].owner;
        _remove(_tokenId);

        burnCount_ += 1;

        emit Transfer(owner, NA, _tokenId);
    }

    /// @dev Receive count of burned tokens. Should be greater than `totalSupply`
    /// but less than `mintCount`.
    /// @return Number of burned tokens
    function burnCount()
        external
        view
        returns(uint256)
    {
        return burnCount_;
    }

    function onERC721Received(address, uint256, bytes)
        public returns(bytes4) 
    {
        return ERC721_RECEIVED;
    }
}



/// @title Managing contract. implements the logic of buying tokens, depositing / withdrawing funds 
/// to the project account and importing / exporting tokens
contract EtherDragonsCore is DragonOwnership 
{
    using SafeMath8 for uint8;
    using SafeMath32 for uint32;
    using SafeMath256 for uint256;
    using AddressUtils for address;
    using StringUtils for string;
    using UintStringUtils for uint;

    // @dev Non Assigned address.
    address constant NA = address(0);

    /// @dev Bounty tokens count limit
    uint256 public constant BOUNTY_LIMIT = 2500;
    /// @dev Presale tokens count limit
    uint256 public constant PRESALE_LIMIT = 7500;
    ///@dev Total gen0tokens generation limit
    uint256 public constant GEN0_CREATION_LIMIT = 90000;
    
    /// @dev Number of tokens minted in presale stage
    uint256 internal presaleCount_;  
    /// @dev Number of tokens minted for bounty campaign
    uint256 internal bountyCount_;
   
    ///@dev Company bank address
    address internal bank_;

    // Extension ---------------------------------------------------------------

    /// @dev Contract is not payable. To fullfil balance method `depositTo`
    /// should be used.
    function ()
        public payable
    {
        revert();
    }

    /// @dev amount on the account of the contract. This amount consists of deposits  from players and the system reserve for payment of transactions
    /// the player at any time to withdraw the amount corresponding to his account in the game, minus the cost of the transaction 
    function getBalance() 
        public view returns (uint256)
    {
        return address(this).balance;
    }    

    /// @dev at the moment of creation of the contract we transfer the address of the bank
    /// presell contract address set later
    constructor(
        address _bank
    )
        public
    {
        require(_bank != NA);
        
        controller_ = msg.sender;
        bank_ = _bank;
        
        // Meta
        name_ = "EtherDragons";
        symbol_ = "ED";
        url_ = "https://game.etherdragons.world/token/";

        // Token mint limit
        maxSupply_ = GEN0_CREATION_LIMIT + BOUNTY_LIMIT + PRESALE_LIMIT;
    }

    /// Number of tokens minted in presale stage
    function totalPresaleCount()
        public view returns(uint256)
    {
        return presaleCount_;
    }    

    /// @dev Number of tokens minted for bounty campaign
    function totalBountyCount()
        public view returns(uint256)
    {
        return bountyCount_;
    }    
    
    /// @dev Check if new token could be minted. Return true if count of minted
    /// tokens less than could be minted through contract deploy.
    /// Also, tokens can not be created more often than once in mintDelay_ minutes
    /// @return True if current count is less then maximum tokens available for now.
    function canMint()
        public view returns(bool)
    {
        return (mintCount_ + presaleCount_ + bountyCount_) < maxSupply_;
    }

    /// @dev Here we write the addresses of the wallets of the server from which it is accessed
    /// to contract methods.
    /// @param _to New minion address
    function minionAdd(address _to)
        external controllerOnly
    {
        require(minions_[_to] == false, "already_minion");
        
        // разрешаем этому адресу пользоваться токенами контакта
        // allow the address to use contract tokens 
        _setApprovalForAll(address(this), _to, true);
        
        minions_[_to] = true;
    }

    /// @dev delete the address of the server wallet
    /// @param _to Minion address
    function minionRemove(address _to)
        external controllerOnly
    {
        require(minions_[_to], "not_a_minion");

        // and forbid this wallet to use tokens of the contract
        _setApprovalForAll(address(this), _to, false);
        minions_[_to] = false;
    }

    /// @dev Here the player can put funds to the account of the contract
    /// and get the same amount of in-game currency
    /// the game server understands who puts money at the wallet address
    function depositTo()
        public payable
    {
        emit Deposit(msg.sender, msg.value);
    }    
    
    /// @dev Transfer amount of Ethers to specified receiver. Only owner can
    // call this method.
    /// @param _to Transfer receiver.
    /// @param _amount Transfer value.
    /// @param _transferCost Transfer cost.
    function transferAmount(address _to, uint256 _amount, uint256 _transferCost)
        external minionOnly
    {
        require((_amount + _transferCost) <= address(this).balance, "not enough money!");
        _to.transfer(_amount);

        // send to the wallet of the server the transfer cost
        // withdraw  it from the balance of the contract. this amount must be withdrawn from the player
        // on the side of the game server
        if (_transferCost > 0) {
            msg.sender.transfer(_transferCost);
        }

        emit Withdraw(_to, _amount);
    }        

   /// @dev Mint new token with specified params. Transfer `_fee` to the
    /// `bank`. 
    /// @param _to New token owner.
    /// @param _fee Transaction fee.
    /// @param _genNum Generation number..
    /// @param _genome New genome unique value.
    /// @param _parentA Parent A.
    /// @param _parentB Parent B.
    /// @param _petId Pet identifier.
    /// @param _params List of parameters for pet.
    /// @param _transferCost Transfer cost.
    /// @return New token id.
    function mintRelease(
        address _to,
        uint256 _fee,
        
        // Constant Token params
        uint8   _genNum,
        string   _genome,
        uint256 _parentA,
        uint256 _parentB,
        
        // Game-depening Token params
        uint256 _petId,  //if petID = 0, then it was created outside of the server
        string   _params,
        uint256 _transferCost
    )
        external minionOnly operateModeOnly returns(uint256)
    {
        require(canMint(), "can_mint");
        require(_to != NA, "_to");
        require((_fee + _transferCost) <= address(this).balance, "_fee");
        require(bytes(_params).length != 0, "params_length");
        require(bytes(_genome).length == 77, "genome_length");
        
        // Parents should be both 0 or both not.
        if (_parentA != 0 && _parentB != 0) {
            require(_parentA != _parentB, "same_parent");
        }
        else if (_parentA == 0 && _parentB != 0) {
            revert("parentA_empty");
        }
        else if (_parentB == 0 && _parentA != 0) {
            revert("parentB_empty");
        }

        uint256 tokenId = _createToken(_to, _genNum, _genome, _parentA, _parentB, _petId, _params);

        require(_checkAndCallSafeTransfer(NA, _to, tokenId, ""), "safe_transfer");

        // Transfer mint fee to the fund
        CommonWallet(bank_).receive.value(_fee)();

        emit Transfer(NA, _to, tokenId);

        // send to the server wallet server the transfer cost,
        // withdraw it from the balance of the contract. this amount must be withdrawn from the player
        // on the side of the game server
        if (_transferCost > 0) {
            msg.sender.transfer(_transferCost);
        }

        return tokenId;
    }

    /// @dev Create new token via presale state
    /// @param _to New token owner.
    /// @param _genome New genome unique value.
    /// @return New token id.
    /// at the pre-sale stage we sell the zero-generation pets, which have only a genome.
    /// other attributes of such a token get when importing to the server
    function mintPresell(address _to, string _genome)
        external presaleOnly presaleModeOnly returns(uint256)
    {
        require(presaleCount_ < PRESALE_LIMIT, "presale_limit");

        // у пресейл пета нет параметров. Их он получит после ввода в игру.
        uint256 tokenId = _createToken(_to, 0, _genome, 0, 0, 0, "");
        presaleCount_ += 1;

        require(_checkAndCallSafeTransfer(NA, _to, tokenId, ""), "safe_transfer");

        emit Transfer(NA, _to, tokenId);
        
        return tokenId;
    }    
    
    /// @dev Create new token for bounty activity
    /// @param _to New token owner.
    /// @return New token id.
    function mintBounty(address _to, string _genome)
        external controllerOnly returns(uint256)
    {
        require(bountyCount_ < BOUNTY_LIMIT, "bounty_limit");

        // bounty pet has no parameters. They will receive them after importing to the game.
        uint256 tokenId = _createToken(_to, 0, _genome, 0, 0, 0, "");
    
        bountyCount_ += 1;
        require(_checkAndCallSafeTransfer(NA, _to, tokenId, ""), "safe_transfer");

        emit Transfer(NA, _to, tokenId);

        return tokenId;
    }        
}

• No Contract Security Audit Submitted- Submit Audit Here

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00000000000000000000000094cc5746b2a0246ca844aee92a9c7f59adca25c7

-----Decoded View---------------
Arg [0] : _bank (address): 0x94cc5746b2A0246cA844AEe92a9c7F59adCa25c7

-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 00000000000000000000000094cc5746b2a0246ca844aee92a9c7f59adca25c7

bzzr://866a13716ce753d0db0a16459b318b88de83313f7b59c000bd895cf7504cf74f