Contract Source Code:
File 1 of 1 : ETHero
pragma solidity ^0.4.21;
// The contract uses code from zeppelin-solidity library
// licensed under MIT license
// https://github.com/OpenZeppelin/zeppelin-solidity
library SafeMath {
function mul(uint256 a, uint256 b) internal pure returns (uint256) {
if (a == 0) {
return 0;
}
uint256 c = a * b;
assert(c / a == b);
return c;
}
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 c;
}
function sub(uint256 a, uint256 b) internal pure returns (uint256) {
assert(b <= a);
return a - b;
}
function add(uint256 a, uint256 b) internal pure returns (uint256) {
uint256 c = a + b;
assert(c >= a);
return c;
}
}
/**
* @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 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 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;
// 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)
{
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);
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);
}
/**
* 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 _user address to check
* @return whether the target address is a contract
*/
function _isContract(address _user) internal view returns (bool) {
uint size;
assembly { size := extcodesize(_user) }
return size > 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 (!_isContract(_to)) {
return true;
}
bytes4 retval = ERC721Receiver(_to).onERC721Received(_from, _tokenId, _data);
return (retval == ERC721_RECEIVED);
}
}
contract Owned {
address owner;
modifier onlyOwner {
require(msg.sender == owner);
_;
}
/// @dev Contract constructor
function Owned() public {
owner = msg.sender;
}
}
contract HeroLogicInterface {
function isTransferAllowed(address _from, address _to, uint256 _tokenId) public view returns (bool);
}
contract ETHero is Owned, ERC721, ERC721BasicToken {
struct HeroData {
uint16 fieldA;
uint16 fieldB;
uint32 fieldC;
uint32 fieldD;
uint32 fieldE;
uint64 fieldF;
uint64 fieldG;
}
// 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;
// Prefix for token URIs
string public tokenUriPrefix = "https://eth.town/hero-image/";
// Interchangeable logic contract
address public logicContract;
// Incremental uniqueness index for the genome
uint32 public uniquenessIndex = 0;
// Last token ID
uint256 public lastTokenId = 0;
// Users' active heroes
mapping(address => uint256) public activeHero;
// Hero data
mapping(uint256 => HeroData) public heroData;
// Genomes
mapping(uint256 => uint256) public genome;
event ActiveHeroChanged(address indexed _from, uint256 _tokenId);
modifier onlyLogicContract {
require(msg.sender == logicContract || msg.sender == owner);
_;
}
/**
* @dev Constructor function
*/
function ETHero() public {
name_ = "ETH.TOWN Hero";
symbol_ = "HERO";
}
/**
* @dev Sets the token's interchangeable logic contract
*/
function setLogicContract(address _logicContract) external onlyOwner {
logicContract = _logicContract;
}
/**
* @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 Internal function to check if transferring a specific token is allowed
* @param _from transfer from
* @param _to transfer to
* @param _tokenId token to transfer
*/
function _isTransferAllowed(address _from, address _to, uint256 _tokenId) internal view returns (bool) {
if (logicContract == address(0)) {
return true;
}
HeroLogicInterface logic = HeroLogicInterface(logicContract);
return logic.isTransferAllowed(_from, _to, _tokenId);
}
/**
* @dev Appends uint (in decimal) to a string
* @param _str The prefix string
* @param _value The uint to append
* @return resulting string
*/
function _appendUintToString(string _str, uint _value) internal pure returns (string) {
uint maxLength = 100;
bytes memory reversed = new bytes(maxLength);
uint i = 0;
while (_value != 0) {
uint remainder = _value % 10;
_value = _value / 10;
reversed[i++] = byte(48 + remainder);
}
i--;
bytes memory inStrB = bytes(_str);
bytes memory s = new bytes(inStrB.length + i + 1);
uint j;
for (j = 0; j < inStrB.length; j++) {
s[j] = inStrB[j];
}
for (j = 0; j <= i; j++) {
s[j + inStrB.length] = reversed[i - j];
}
return string(s);
}
/**
* @dev Returns an URI for a given token ID
* @dev Throws if the token ID does not exist
* @param _tokenId uint256 ID of the token to query
*/
function tokenURI(uint256 _tokenId) public view returns (string) {
require(exists(_tokenId));
return _appendUintToString(tokenUriPrefix, genome[_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 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;
if (activeHero[_to] == 0) {
activeHero[_to] = _tokenId;
emit ActiveHeroChanged(_to, _tokenId);
}
}
/**
* @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;
// If a hero is removed from its owner, it no longer can be their active hero
if (activeHero[_from] == _tokenId) {
activeHero[_from] = 0;
emit ActiveHeroChanged(_from, 0);
}
}
/**
* @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 {
require(_to != address(0));
addTokenTo(_to, _tokenId);
emit Transfer(address(0), _to, _tokenId);
allTokensIndex[_tokenId] = allTokens.length;
allTokens.push(_tokenId);
}
/**
* @dev External 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) external onlyLogicContract {
_mint(_to, _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 {
clearApproval(_owner, _tokenId);
removeTokenFrom(_owner, _tokenId);
emit Transfer(_owner, address(0), _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;
// Clear genome data
if (genome[_tokenId] != 0) {
genome[_tokenId] = 0;
}
}
/**
* @dev External 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) external onlyLogicContract {
_burn(_owner, _tokenId);
}
/**
* @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(_isTransferAllowed(_from, _to, _tokenId));
super.transferFrom(_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)
{
require(_isTransferAllowed(_from, _to, _tokenId));
super.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)
{
require(_isTransferAllowed(_from, _to, _tokenId));
super.safeTransferFrom(_from, _to, _tokenId, _data);
}
/**
* @dev Allows to transfer a token to another owner
* @param _to transfer to
* @param _tokenId token to transfer
*/
function transfer(address _to, uint256 _tokenId) external onlyOwnerOf(_tokenId) {
require(_isTransferAllowed(msg.sender, _to, _tokenId));
require(_to != address(0));
clearApproval(msg.sender, _tokenId);
removeTokenFrom(msg.sender, _tokenId);
addTokenTo(_to, _tokenId);
emit Transfer(msg.sender, _to, _tokenId);
}
/**
* @dev Sets the specified token as user's active Hero
* @param _tokenId the hero token to set as active
*/
function setActiveHero(uint256 _tokenId) external onlyOwnerOf(_tokenId) {
activeHero[msg.sender] = _tokenId;
emit ActiveHeroChanged(msg.sender, _tokenId);
}
/**
* @dev Queries list of tokens owned by a specific address
* @param _owner the address to get tokens of
*/
function tokensOfOwner(address _owner) external view returns (uint256[]) {
return ownedTokens[_owner];
}
/**
* @dev Gets the genome of the active hero
* @param _owner the address to get hero of
*/
function activeHeroGenome(address _owner) public view returns (uint256) {
uint256 tokenId = activeHero[_owner];
if (tokenId == 0) {
return 0;
}
return genome[tokenId];
}
/**
* @dev Increments uniqueness index. Overflow intentionally allowed.
*/
function incrementUniquenessIndex() external onlyLogicContract {
uniquenessIndex ++;
}
/**
* @dev Increments lastTokenId
*/
function incrementLastTokenId() external onlyLogicContract {
lastTokenId ++;
}
/**
* @dev Allows (re-)setting the uniqueness index
* @param _uniquenessIndex new value
*/
function setUniquenessIndex(uint32 _uniquenessIndex) external onlyOwner {
uniquenessIndex = _uniquenessIndex;
}
/**
* @dev Allows (re-)setting lastTokenId
* @param _lastTokenId new value
*/
function setLastTokenId(uint256 _lastTokenId) external onlyOwner {
lastTokenId = _lastTokenId;
}
/**
* @dev Allows setting hero data for a hero
* @param _tokenId hero to set data for
* @param _fieldA data to set
* @param _fieldB data to set
* @param _fieldC data to set
* @param _fieldD data to set
* @param _fieldE data to set
* @param _fieldF data to set
* @param _fieldG data to set
*/
function setHeroData(
uint256 _tokenId,
uint16 _fieldA,
uint16 _fieldB,
uint32 _fieldC,
uint32 _fieldD,
uint32 _fieldE,
uint64 _fieldF,
uint64 _fieldG
) external onlyLogicContract {
heroData[_tokenId] = HeroData(
_fieldA,
_fieldB,
_fieldC,
_fieldD,
_fieldE,
_fieldF,
_fieldG
);
}
/**
* @dev Allows setting hero genome
* @param _tokenId token to set data for
* @param _genome genome data to set
*/
function setGenome(uint256 _tokenId, uint256 _genome) external onlyLogicContract {
genome[_tokenId] = _genome;
}
/**
* @dev Allows the admin to forcefully transfer a token from one address to another
* @param _from transfer from
* @param _to transfer to
* @param _tokenId token to transfer
*/
function forceTransfer(address _from, address _to, uint256 _tokenId) external onlyLogicContract {
require(_from != address(0));
require(_to != address(0));
clearApproval(_from, _tokenId);
removeTokenFrom(_from, _tokenId);
addTokenTo(_to, _tokenId);
emit Transfer(_from, _to, _tokenId);
}
/**
* @dev External function to set the token URI prefix for all tokens
* @param _uriPrefix prefix string to assign
*/
function setTokenUriPrefix(string _uriPrefix) external onlyOwner {
tokenUriPrefix = _uriPrefix;
}
}