Contract Name:
GenArt721CoreV2_TBOA
Contract Source Code:
pragma solidity ^0.5.0;
import "../../libs/CustomERC721Metadata.sol";
import "../../libs/SafeMath.sol";
import "../../libs/Strings.sol";
interface IRandomizer {
function returnValue() external view returns (bytes32);
}
contract GenArt721CoreV2_TBOA is CustomERC721Metadata {
using SafeMath for uint256;
event Mint(
address indexed _to,
uint256 indexed _tokenId,
uint256 indexed _projectId
);
IRandomizer public randomizerContract;
struct Project {
string name;
string artist;
string description;
string website;
string license;
string projectBaseURI;
uint256 invocations;
uint256 maxInvocations;
string scriptJSON;
mapping(uint256 => string) scripts;
uint256 scriptCount;
string ipfsHash;
bool active;
bool locked;
bool paused;
}
uint256 constant ONE_MILLION = 1_000_000;
mapping(uint256 => Project) projects;
//All financial functions are stripped from struct for visibility
mapping(uint256 => address) public projectIdToArtistAddress;
mapping(uint256 => string) public projectIdToCurrencySymbol;
mapping(uint256 => address) public projectIdToCurrencyAddress;
mapping(uint256 => uint256) public projectIdToPricePerTokenInWei;
mapping(uint256 => address) public projectIdToAdditionalPayee;
mapping(uint256 => uint256) public projectIdToAdditionalPayeePercentage;
mapping(uint256 => uint256)
public projectIdToSecondaryMarketRoyaltyPercentage;
address public renderProviderAddress;
uint256 public renderProviderPercentage = 10;
mapping(uint256 => uint256) public tokenIdToProjectId;
mapping(uint256 => bytes32) public tokenIdToHash;
mapping(bytes32 => uint256) public hashToTokenId;
address public admin;
mapping(address => bool) public isWhitelisted;
mapping(address => bool) public isMintWhitelisted;
uint256 public nextProjectId = 0;
modifier onlyValidTokenId(uint256 _tokenId) {
require(_exists(_tokenId), "Token ID does not exist");
_;
}
modifier onlyUnlocked(uint256 _projectId) {
require(!projects[_projectId].locked, "Only if unlocked");
_;
}
modifier onlyArtist(uint256 _projectId) {
require(
msg.sender == projectIdToArtistAddress[_projectId],
"Only artist"
);
_;
}
modifier onlyAdmin() {
require(msg.sender == admin, "Only admin");
_;
}
modifier onlyWhitelisted() {
require(isWhitelisted[msg.sender], "Only whitelisted");
_;
}
modifier onlyArtistOrWhitelisted(uint256 _projectId) {
require(
isWhitelisted[msg.sender] ||
msg.sender == projectIdToArtistAddress[_projectId],
"Only artist or whitelisted"
);
_;
}
constructor(
string memory _tokenName,
string memory _tokenSymbol,
address _randomizerContract
) public CustomERC721Metadata(_tokenName, _tokenSymbol) {
admin = msg.sender;
isWhitelisted[msg.sender] = true;
renderProviderAddress = msg.sender;
randomizerContract = IRandomizer(_randomizerContract);
}
function mint(
address _to,
uint256 _projectId,
address _by
) external returns (uint256 _tokenId) {
require(
isMintWhitelisted[msg.sender],
"Must mint from whitelisted minter contract."
);
require(
projects[_projectId].invocations.add(1) <=
projects[_projectId].maxInvocations,
"Must not exceed max invocations"
);
require(
projects[_projectId].active ||
_by == projectIdToArtistAddress[_projectId],
"Project must exist and be active"
);
require(
!projects[_projectId].paused ||
_by == projectIdToArtistAddress[_projectId],
"Purchases are paused."
);
uint256 tokenId = _mintToken(_to, _projectId);
return tokenId;
}
function _mintToken(address _to, uint256 _projectId)
internal
returns (uint256 _tokenId)
{
uint256 tokenIdToBe = (_projectId * ONE_MILLION) +
projects[_projectId].invocations;
projects[_projectId].invocations = projects[_projectId].invocations.add(
1
);
bytes32 hash = keccak256(
abi.encodePacked(
projects[_projectId].invocations,
block.number,
blockhash(block.number - 1),
randomizerContract.returnValue()
)
);
tokenIdToHash[tokenIdToBe] = hash;
hashToTokenId[hash] = tokenIdToBe;
_mint(_to, tokenIdToBe);
tokenIdToProjectId[tokenIdToBe] = _projectId;
emit Mint(_to, tokenIdToBe, _projectId);
return tokenIdToBe;
}
function updateAdmin(address _adminAddress) public onlyAdmin {
admin = _adminAddress;
}
function updateRenderProviderAddress(address _renderProviderAddress)
public
onlyAdmin
{
renderProviderAddress = _renderProviderAddress;
}
function updateRenderProviderPercentage(uint256 _renderProviderPercentage)
public
onlyAdmin
{
require(_renderProviderPercentage <= 25, "Max of 25%");
renderProviderPercentage = _renderProviderPercentage;
}
function addWhitelisted(address _address) public onlyAdmin {
isWhitelisted[_address] = true;
}
function removeWhitelisted(address _address) public onlyAdmin {
isWhitelisted[_address] = false;
}
function addMintWhitelisted(address _address) public onlyAdmin {
isMintWhitelisted[_address] = true;
}
function removeMintWhitelisted(address _address) public onlyAdmin {
isMintWhitelisted[_address] = false;
}
function updateRandomizerAddress(address _randomizerAddress)
public
onlyWhitelisted
{
randomizerContract = IRandomizer(_randomizerAddress);
}
function toggleProjectIsLocked(uint256 _projectId)
public
onlyWhitelisted
onlyUnlocked(_projectId)
{
projects[_projectId].locked = true;
}
function toggleProjectIsActive(uint256 _projectId) public onlyWhitelisted {
projects[_projectId].active = !projects[_projectId].active;
}
function updateProjectArtistAddress(
uint256 _projectId,
address _artistAddress
) public onlyArtistOrWhitelisted(_projectId) {
projectIdToArtistAddress[_projectId] = _artistAddress;
}
function toggleProjectIsPaused(uint256 _projectId)
public
onlyArtist(_projectId)
{
projects[_projectId].paused = !projects[_projectId].paused;
}
function addProject(
string memory _projectName,
address _artistAddress,
uint256 _pricePerTokenInWei
) public onlyWhitelisted {
uint256 projectId = nextProjectId;
projectIdToArtistAddress[projectId] = _artistAddress;
projects[projectId].name = _projectName;
projectIdToCurrencySymbol[projectId] = "ETH";
projectIdToPricePerTokenInWei[projectId] = _pricePerTokenInWei;
projects[projectId].paused = true;
projects[projectId].maxInvocations = ONE_MILLION;
nextProjectId = nextProjectId.add(1);
}
function updateProjectCurrencyInfo(
uint256 _projectId,
string memory _currencySymbol,
address _currencyAddress
) public onlyArtist(_projectId) {
projectIdToCurrencySymbol[_projectId] = _currencySymbol;
projectIdToCurrencyAddress[_projectId] = _currencyAddress;
}
function updateProjectPricePerTokenInWei(
uint256 _projectId,
uint256 _pricePerTokenInWei
) public onlyArtist(_projectId) {
projectIdToPricePerTokenInWei[_projectId] = _pricePerTokenInWei;
}
function updateProjectName(uint256 _projectId, string memory _projectName)
public
onlyUnlocked(_projectId)
onlyArtistOrWhitelisted(_projectId)
{
projects[_projectId].name = _projectName;
}
function updateProjectArtistName(
uint256 _projectId,
string memory _projectArtistName
) public onlyUnlocked(_projectId) onlyArtistOrWhitelisted(_projectId) {
projects[_projectId].artist = _projectArtistName;
}
function updateProjectAdditionalPayeeInfo(
uint256 _projectId,
address _additionalPayee,
uint256 _additionalPayeePercentage
) public onlyArtist(_projectId) {
require(_additionalPayeePercentage <= 100, "Max of 100%");
projectIdToAdditionalPayee[_projectId] = _additionalPayee;
projectIdToAdditionalPayeePercentage[
_projectId
] = _additionalPayeePercentage;
}
function updateProjectSecondaryMarketRoyaltyPercentage(
uint256 _projectId,
uint256 _secondMarketRoyalty
) public onlyArtist(_projectId) {
require(_secondMarketRoyalty <= 100, "Max of 100%");
projectIdToSecondaryMarketRoyaltyPercentage[
_projectId
] = _secondMarketRoyalty;
}
function updateProjectDescription(
uint256 _projectId,
string memory _projectDescription
) public onlyArtist(_projectId) {
projects[_projectId].description = _projectDescription;
}
function updateProjectWebsite(
uint256 _projectId,
string memory _projectWebsite
) public onlyArtist(_projectId) {
projects[_projectId].website = _projectWebsite;
}
function updateProjectLicense(
uint256 _projectId,
string memory _projectLicense
) public onlyUnlocked(_projectId) onlyArtistOrWhitelisted(_projectId) {
projects[_projectId].license = _projectLicense;
}
function updateProjectMaxInvocations(
uint256 _projectId,
uint256 _maxInvocations
) public onlyArtist(_projectId) {
require(
(!projects[_projectId].locked ||
_maxInvocations < projects[_projectId].maxInvocations),
"Only if unlocked"
);
require(
_maxInvocations > projects[_projectId].invocations,
"You must set max invocations greater than current invocations"
);
require(_maxInvocations <= ONE_MILLION, "Cannot exceed 1000000");
projects[_projectId].maxInvocations = _maxInvocations;
}
function addProjectScript(uint256 _projectId, string memory _script)
public
onlyUnlocked(_projectId)
onlyArtistOrWhitelisted(_projectId)
{
projects[_projectId].scripts[
projects[_projectId].scriptCount
] = _script;
projects[_projectId].scriptCount = projects[_projectId].scriptCount.add(
1
);
}
function updateProjectScript(
uint256 _projectId,
uint256 _scriptId,
string memory _script
) public onlyUnlocked(_projectId) onlyArtistOrWhitelisted(_projectId) {
require(
_scriptId < projects[_projectId].scriptCount,
"scriptId out of range"
);
projects[_projectId].scripts[_scriptId] = _script;
}
function removeProjectLastScript(uint256 _projectId)
public
onlyUnlocked(_projectId)
onlyArtistOrWhitelisted(_projectId)
{
require(
projects[_projectId].scriptCount > 0,
"there are no scripts to remove"
);
delete projects[_projectId].scripts[
projects[_projectId].scriptCount - 1
];
projects[_projectId].scriptCount = projects[_projectId].scriptCount.sub(
1
);
}
function updateProjectScriptJSON(
uint256 _projectId,
string memory _projectScriptJSON
) public onlyUnlocked(_projectId) onlyArtistOrWhitelisted(_projectId) {
projects[_projectId].scriptJSON = _projectScriptJSON;
}
function updateProjectIpfsHash(uint256 _projectId, string memory _ipfsHash)
public
onlyUnlocked(_projectId)
onlyArtistOrWhitelisted(_projectId)
{
projects[_projectId].ipfsHash = _ipfsHash;
}
function updateProjectBaseURI(uint256 _projectId, string memory _newBaseURI)
public
onlyArtist(_projectId)
{
projects[_projectId].projectBaseURI = _newBaseURI;
}
function projectDetails(uint256 _projectId)
public
view
returns (
string memory projectName,
string memory artist,
string memory description,
string memory website,
string memory license
)
{
projectName = projects[_projectId].name;
artist = projects[_projectId].artist;
description = projects[_projectId].description;
website = projects[_projectId].website;
license = projects[_projectId].license;
}
function projectTokenInfo(uint256 _projectId)
public
view
returns (
address artistAddress,
uint256 pricePerTokenInWei,
uint256 invocations,
uint256 maxInvocations,
bool active,
address additionalPayee,
uint256 additionalPayeePercentage,
string memory currency,
address currencyAddress
)
{
artistAddress = projectIdToArtistAddress[_projectId];
pricePerTokenInWei = projectIdToPricePerTokenInWei[_projectId];
invocations = projects[_projectId].invocations;
maxInvocations = projects[_projectId].maxInvocations;
active = projects[_projectId].active;
additionalPayee = projectIdToAdditionalPayee[_projectId];
additionalPayeePercentage = projectIdToAdditionalPayeePercentage[
_projectId
];
currency = projectIdToCurrencySymbol[_projectId];
currencyAddress = projectIdToCurrencyAddress[_projectId];
}
function projectScriptInfo(uint256 _projectId)
public
view
returns (
string memory scriptJSON,
uint256 scriptCount,
string memory ipfsHash,
bool locked,
bool paused
)
{
scriptJSON = projects[_projectId].scriptJSON;
scriptCount = projects[_projectId].scriptCount;
ipfsHash = projects[_projectId].ipfsHash;
locked = projects[_projectId].locked;
paused = projects[_projectId].paused;
}
function projectScriptByIndex(uint256 _projectId, uint256 _index)
public
view
returns (string memory)
{
return projects[_projectId].scripts[_index];
}
function projectURIInfo(uint256 _projectId)
public
view
returns (string memory projectBaseURI)
{
projectBaseURI = projects[_projectId].projectBaseURI;
}
function tokensOfOwner(address owner)
external
view
returns (uint256[] memory)
{
return _tokensOfOwner(owner);
}
function getRoyaltyData(uint256 _tokenId)
public
view
returns (
address artistAddress,
address additionalPayee,
uint256 additionalPayeePercentage,
uint256 royaltyFeeByID
)
{
artistAddress = projectIdToArtistAddress[tokenIdToProjectId[_tokenId]];
additionalPayee = projectIdToAdditionalPayee[
tokenIdToProjectId[_tokenId]
];
additionalPayeePercentage = projectIdToAdditionalPayeePercentage[
tokenIdToProjectId[_tokenId]
];
royaltyFeeByID = projectIdToSecondaryMarketRoyaltyPercentage[
tokenIdToProjectId[_tokenId]
];
}
function tokenURI(uint256 _tokenId)
external
view
onlyValidTokenId(_tokenId)
returns (string memory)
{
return
Strings.strConcat(
projects[tokenIdToProjectId[_tokenId]].projectBaseURI,
Strings.uint2str(_tokenId)
);
}
}
// File: contracts/CustomERC721Metadata.sol
pragma solidity ^0.5.0;
import "./ERC165.sol";
import "./ERC721.sol";
import "./ERC721Enumerable.sol";
/**
* ERC721 base contract without the concept of tokenUri as this is managed by the parent
*/
contract CustomERC721Metadata is ERC165, ERC721, ERC721Enumerable {
// Token name
string private _name;
// Token symbol
string private _symbol;
bytes4 private constant _INTERFACE_ID_ERC721_METADATA = 0x5b5e139f;
/**
* @dev Constructor function
*/
constructor(string memory name, string memory symbol) public {
_name = name;
_symbol = symbol;
// register the supported interfaces to conform to ERC721 via ERC165
_registerInterface(_INTERFACE_ID_ERC721_METADATA);
}
/**
* @dev Gets the token name
* @return string representing the token name
*/
function name() external view returns (string memory) {
return _name;
}
/**
* @dev Gets the token symbol
* @return string representing the token symbol
*/
function symbol() external view returns (string memory) {
return _symbol;
}
}
// File: openzeppelin-solidity/contracts/math/SafeMath.sol
pragma solidity ^0.5.0;
/**
* @dev Wrappers over Solidity's arithmetic operations with added overflow
* checks.
*
* Arithmetic operations in Solidity wrap on overflow. This can easily result
* in bugs, because programmers usually assume that an overflow raises an
* error, which is the standard behavior in high level programming languages.
* `SafeMath` restores this intuition by reverting the transaction when an
* operation overflows.
*
* Using this library instead of the unchecked operations eliminates an entire
* class of bugs, so it's recommended to use it always.
*/
library SafeMath {
/**
* @dev Returns the addition of two unsigned integers, reverting on
* overflow.
*
* Counterpart to Solidity's `+` operator.
*
* Requirements:
* - Addition cannot overflow.
*/
function add(uint256 a, uint256 b) internal pure returns (uint256) {
uint256 c = a + b;
require(c >= a, "SafeMath: addition overflow");
return c;
}
/**
* @dev Returns the subtraction of two unsigned integers, reverting on
* overflow (when the result is negative).
*
* Counterpart to Solidity's `-` operator.
*
* Requirements:
* - Subtraction cannot overflow.
*/
function sub(uint256 a, uint256 b) internal pure returns (uint256) {
require(b <= a, "SafeMath: subtraction overflow");
uint256 c = a - b;
return c;
}
/**
* @dev Returns the multiplication of two unsigned integers, reverting on
* overflow.
*
* Counterpart to Solidity's `*` operator.
*
* Requirements:
* - Multiplication cannot overflow.
*/
function mul(uint256 a, uint256 b) internal pure returns (uint256) {
// Gas optimization: this is cheaper than requiring '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;
}
uint256 c = a * b;
require(c / a == b, "SafeMath: multiplication overflow");
return c;
}
/**
* @dev Returns the integer division of two unsigned integers. Reverts on
* division by zero. The result is rounded towards zero.
*
* Counterpart to Solidity's `/` operator. Note: this function uses a
* `revert` opcode (which leaves remaining gas untouched) while Solidity
* uses an invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
* - The divisor cannot be zero.
*/
function div(uint256 a, uint256 b) internal pure returns (uint256) {
// Solidity only automatically asserts when dividing by 0
require(b > 0, "SafeMath: division by zero");
uint256 c = a / b;
// assert(a == b * c + a % b); // There is no case in which this doesn't hold
return c;
}
}
// File: contracts/Strings.sol
pragma solidity ^0.5.0;
//https://github.com/oraclize/ethereum-api/blob/master/oraclizeAPI_0.5.sol
library Strings {
function strConcat(string memory _a, string memory _b)
internal
pure
returns (string memory _concatenatedString)
{
return strConcat(_a, _b, "", "", "");
}
function strConcat(
string memory _a,
string memory _b,
string memory _c
) internal pure returns (string memory _concatenatedString) {
return strConcat(_a, _b, _c, "", "");
}
function strConcat(
string memory _a,
string memory _b,
string memory _c,
string memory _d
) internal pure returns (string memory _concatenatedString) {
return strConcat(_a, _b, _c, _d, "");
}
function strConcat(
string memory _a,
string memory _b,
string memory _c,
string memory _d,
string memory _e
) internal pure returns (string memory _concatenatedString) {
bytes memory _ba = bytes(_a);
bytes memory _bb = bytes(_b);
bytes memory _bc = bytes(_c);
bytes memory _bd = bytes(_d);
bytes memory _be = bytes(_e);
string memory abcde = new string(
_ba.length + _bb.length + _bc.length + _bd.length + _be.length
);
bytes memory babcde = bytes(abcde);
uint256 k = 0;
uint256 i = 0;
for (i = 0; i < _ba.length; i++) {
babcde[k++] = _ba[i];
}
for (i = 0; i < _bb.length; i++) {
babcde[k++] = _bb[i];
}
for (i = 0; i < _bc.length; i++) {
babcde[k++] = _bc[i];
}
for (i = 0; i < _bd.length; i++) {
babcde[k++] = _bd[i];
}
for (i = 0; i < _be.length; i++) {
babcde[k++] = _be[i];
}
return string(babcde);
}
function uint2str(uint256 _i)
internal
pure
returns (string memory _uintAsString)
{
if (_i == 0) {
return "0";
}
uint256 j = _i;
uint256 len;
while (j != 0) {
len++;
j /= 10;
}
bytes memory bstr = new bytes(len);
uint256 k = len - 1;
while (_i != 0) {
bstr[k--] = bytes1(uint8(48 + (_i % 10)));
_i /= 10;
}
return string(bstr);
}
}
// File: openzeppelin-solidity/contracts/introspection/ERC165.sol
pragma solidity ^0.5.0;
import "./IERC165.sol";
/**
* @dev Implementation of the `IERC165` interface.
*
* Contracts may inherit from this and call `_registerInterface` to declare
* their support of an interface.
*/
contract ERC165 is IERC165 {
/*
* bytes4(keccak256('supportsInterface(bytes4)')) == 0x01ffc9a7
*/
bytes4 private constant _INTERFACE_ID_ERC165 = 0x01ffc9a7;
/**
* @dev Mapping of interface ids to whether or not it's supported.
*/
mapping(bytes4 => bool) private _supportedInterfaces;
constructor() internal {
// Derived contracts need only register support for their own interfaces,
// we register support for ERC165 itself here
_registerInterface(_INTERFACE_ID_ERC165);
}
/**
* @dev See `IERC165.supportsInterface`.
*
* Time complexity O(1), guaranteed to always use less than 30 000 gas.
*/
function supportsInterface(bytes4 interfaceId)
external
view
returns (bool)
{
return _supportedInterfaces[interfaceId];
}
/**
* @dev Registers the contract as an implementer of the interface defined by
* `interfaceId`. Support of the actual ERC165 interface is automatic and
* registering its interface id is not required.
*
* See `IERC165.supportsInterface`.
*
* Requirements:
*
* - `interfaceId` cannot be the ERC165 invalid interface (`0xffffffff`).
*/
function _registerInterface(bytes4 interfaceId) internal {
require(interfaceId != 0xffffffff, "ERC165: invalid interface id");
_supportedInterfaces[interfaceId] = true;
}
}
// File: openzeppelin-solidity/contracts/token/ERC721/ERC721.sol
pragma solidity ^0.5.0;
import "./ERC165.sol";
import "./IERC721.sol";
import "./SafeMath.sol";
import "./Address.sol";
import "./Counters.sol";
import "./IERC721Receiver.sol";
/**
* @title ERC721 Non-Fungible Token Standard basic implementation
* @dev see https://eips.ethereum.org/EIPS/eip-721
*/
contract ERC721 is ERC165, IERC721 {
using SafeMath for uint256;
using Address for address;
using Counters for Counters.Counter;
// Equals to `bytes4(keccak256("onERC721Received(address,address,uint256,bytes)"))`
// which can be also obtained as `IERC721Receiver(0).onERC721Received.selector`
bytes4 private constant _ERC721_RECEIVED = 0x150b7a02;
// Mapping from token ID to owner
mapping(uint256 => address) private _tokenOwner;
// Mapping from token ID to approved address
mapping(uint256 => address) private _tokenApprovals;
// Mapping from owner to number of owned token
mapping(address => Counters.Counter) private _ownedTokensCount;
// Mapping from owner to operator approvals
mapping(address => mapping(address => bool)) private _operatorApprovals;
bytes4 private constant _INTERFACE_ID_ERC721 = 0x80ac58cd;
constructor() public {
// register the supported interfaces to conform to ERC721 via ERC165
_registerInterface(_INTERFACE_ID_ERC721);
}
function balanceOf(address owner) public view returns (uint256) {
require(
owner != address(0),
"ERC721: balance query for the zero address"
);
return _ownedTokensCount[owner].current();
}
function ownerOf(uint256 tokenId) public view returns (address) {
address owner = _tokenOwner[tokenId];
require(
owner != address(0),
"ERC721: owner query for nonexistent token"
);
return owner;
}
function approve(address to, uint256 tokenId) public {
address owner = ownerOf(tokenId);
require(to != owner, "ERC721: approval to current owner");
require(
msg.sender == owner || isApprovedForAll(owner, msg.sender),
"ERC721: approve caller is not owner nor approved for all"
);
_tokenApprovals[tokenId] = to;
emit Approval(owner, to, tokenId);
}
function getApproved(uint256 tokenId) public view returns (address) {
require(
_exists(tokenId),
"ERC721: approved query for nonexistent token"
);
return _tokenApprovals[tokenId];
}
function setApprovalForAll(address to, bool approved) public {
require(to != msg.sender, "ERC721: approve to caller");
_operatorApprovals[msg.sender][to] = approved;
emit ApprovalForAll(msg.sender, to, approved);
}
function isApprovedForAll(address owner, address operator)
public
view
returns (bool)
{
return _operatorApprovals[owner][operator];
}
function transferFrom(
address from,
address to,
uint256 tokenId
) public {
//solhint-disable-next-line max-line-length
require(
_isApprovedOrOwner(msg.sender, tokenId),
"ERC721: transfer caller is not owner nor approved"
);
_transferFrom(from, to, tokenId);
}
function safeTransferFrom(
address from,
address to,
uint256 tokenId
) public {
safeTransferFrom(from, to, tokenId, "");
}
function safeTransferFrom(
address from,
address to,
uint256 tokenId,
bytes memory _data
) public {
transferFrom(from, to, tokenId);
require(
_checkOnERC721Received(from, to, tokenId, _data),
"ERC721: transfer to non ERC721Receiver implementer"
);
}
function _exists(uint256 tokenId) internal view returns (bool) {
address owner = _tokenOwner[tokenId];
return owner != address(0);
}
function _isApprovedOrOwner(address spender, uint256 tokenId)
internal
view
returns (bool)
{
require(
_exists(tokenId),
"ERC721: operator query for nonexistent token"
);
address owner = ownerOf(tokenId);
return (spender == owner ||
getApproved(tokenId) == spender ||
isApprovedForAll(owner, spender));
}
function _mint(address to, uint256 tokenId) internal {
require(to != address(0), "ERC721: mint to the zero address");
require(!_exists(tokenId), "ERC721: token already minted");
_tokenOwner[tokenId] = to;
_ownedTokensCount[to].increment();
emit Transfer(address(0), to, tokenId);
}
function _burn(address owner, uint256 tokenId) internal {
require(
ownerOf(tokenId) == owner,
"ERC721: burn of token that is not own"
);
_clearApproval(tokenId);
_ownedTokensCount[owner].decrement();
_tokenOwner[tokenId] = address(0);
emit Transfer(owner, address(0), tokenId);
}
function _burn(uint256 tokenId) internal {
_burn(ownerOf(tokenId), tokenId);
}
function _transferFrom(
address from,
address to,
uint256 tokenId
) internal {
require(
ownerOf(tokenId) == from,
"ERC721: transfer of token that is not own"
);
require(to != address(0), "ERC721: transfer to the zero address");
_clearApproval(tokenId);
_ownedTokensCount[from].decrement();
_ownedTokensCount[to].increment();
_tokenOwner[tokenId] = to;
emit Transfer(from, to, tokenId);
}
function _checkOnERC721Received(
address from,
address to,
uint256 tokenId,
bytes memory _data
) internal returns (bool) {
if (!to.isContract()) {
return true;
}
bytes4 retval = IERC721Receiver(to).onERC721Received(
msg.sender,
from,
tokenId,
_data
);
return (retval == _ERC721_RECEIVED);
}
function _clearApproval(uint256 tokenId) private {
if (_tokenApprovals[tokenId] != address(0)) {
_tokenApprovals[tokenId] = address(0);
}
}
}
// File: openzeppelin-solidity/contracts/token/ERC721/ERC721Enumerable.sol
pragma solidity ^0.5.0;
import "./ERC165.sol";
import "./ERC721.sol";
import "./IERC721Enumerable.sol";
/**
* @title ERC-721 Non-Fungible Token with optional enumeration extension logic
* @dev See https://eips.ethereum.org/EIPS/eip-721
*/
contract ERC721Enumerable is ERC165, ERC721, IERC721Enumerable {
// Mapping from owner to list of owned token IDs
mapping(address => uint256[]) private _ownedTokens;
// Mapping from token ID to index of the owner tokens list
mapping(uint256 => uint256) private _ownedTokensIndex;
// Array with all token ids, used for enumeration
uint256[] private _allTokens;
// Mapping from token id to position in the allTokens array
mapping(uint256 => uint256) private _allTokensIndex;
/*
* bytes4(keccak256('totalSupply()')) == 0x18160ddd
* bytes4(keccak256('tokenOfOwnerByIndex(address,uint256)')) == 0x2f745c59
* bytes4(keccak256('tokenByIndex(uint256)')) == 0x4f6ccce7
*
* => 0x18160ddd ^ 0x2f745c59 ^ 0x4f6ccce7 == 0x780e9d63
*/
bytes4 private constant _INTERFACE_ID_ERC721_ENUMERABLE = 0x780e9d63;
/**
* @dev Constructor function.
*/
constructor() public {
// register the supported interface to conform to ERC721Enumerable via ERC165
_registerInterface(_INTERFACE_ID_ERC721_ENUMERABLE);
}
/**
* @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),
"ERC721Enumerable: owner index out of bounds"
);
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(),
"ERC721Enumerable: global index out of bounds"
);
return _allTokens[index];
}
/**
* @dev Internal function to transfer ownership of a given token ID to another address.
* As opposed to transferFrom, this imposes no restrictions on msg.sender.
* @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
) internal {
super._transferFrom(from, to, tokenId);
_removeTokenFromOwnerEnumeration(from, tokenId);
_addTokenToOwnerEnumeration(to, tokenId);
}
/**
* @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
*/
function _mint(address to, uint256 tokenId) internal {
super._mint(to, tokenId);
_addTokenToOwnerEnumeration(to, tokenId);
_addTokenToAllTokensEnumeration(tokenId);
}
/**
* @dev Internal function to burn a specific token.
* Reverts if the token does not exist.
* Deprecated, use _burn(uint256) instead.
* @param owner owner of the token to burn
* @param tokenId uint256 ID of the token being burned
*/
function _burn(address owner, uint256 tokenId) internal {
super._burn(owner, tokenId);
_removeTokenFromOwnerEnumeration(owner, tokenId);
// Since tokenId will be deleted, we can clear its slot in _ownedTokensIndex to trigger a gas refund
_ownedTokensIndex[tokenId] = 0;
_removeTokenFromAllTokensEnumeration(tokenId);
}
/**
* @dev Gets the list of token IDs of the requested owner.
* @param owner address owning the tokens
* @return uint256[] List of token IDs owned by the requested address
*/
function _tokensOfOwner(address owner)
internal
view
returns (uint256[] storage)
{
return _ownedTokens[owner];
}
/**
* @dev Private function to add a token to this extension's ownership-tracking data structures.
* @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 _addTokenToOwnerEnumeration(address to, uint256 tokenId) private {
_ownedTokensIndex[tokenId] = _ownedTokens[to].length;
_ownedTokens[to].push(tokenId);
}
/**
* @dev Private function to add a token to this extension's token tracking data structures.
* @param tokenId uint256 ID of the token to be added to the tokens list
*/
function _addTokenToAllTokensEnumeration(uint256 tokenId) private {
_allTokensIndex[tokenId] = _allTokens.length;
_allTokens.push(tokenId);
}
/**
* @dev Private function to remove a token from this extension's ownership-tracking data structures. Note that
* while the token is not assigned a new owner, the _ownedTokensIndex mapping is _not_ updated: this allows for
* gas optimizations e.g. when performing a transfer operation (avoiding double writes).
* This has O(1) time complexity, but alters the order of the _ownedTokens array.
* @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 _removeTokenFromOwnerEnumeration(address from, uint256 tokenId)
private
{
// To prevent a gap in from's tokens array, we store the last token in the index of the token to delete, and
// then delete the last slot (swap and pop).
uint256 lastTokenIndex = _ownedTokens[from].length.sub(1);
uint256 tokenIndex = _ownedTokensIndex[tokenId];
// When the token to delete is the last token, the swap operation is unnecessary
if (tokenIndex != lastTokenIndex) {
uint256 lastTokenId = _ownedTokens[from][lastTokenIndex];
_ownedTokens[from][tokenIndex] = lastTokenId; // Move the last token to the slot of the to-delete token
_ownedTokensIndex[lastTokenId] = tokenIndex; // Update the moved token's index
}
// This also deletes the contents at the last position of the array
_ownedTokens[from].length--;
// Note that _ownedTokensIndex[tokenId] hasn't been cleared: it still points to the old slot (now occupied by
// lastTokenId, or just over the end of the array if the token was the last one).
}
/**
* @dev Private function to remove a token from this extension's token tracking data structures.
* This has O(1) time complexity, but alters the order of the _allTokens array.
* @param tokenId uint256 ID of the token to be removed from the tokens list
*/
function _removeTokenFromAllTokensEnumeration(uint256 tokenId) private {
// To prevent a gap in the tokens array, we store the last token in the index of the token to delete, and
// then delete the last slot (swap and pop).
uint256 lastTokenIndex = _allTokens.length.sub(1);
uint256 tokenIndex = _allTokensIndex[tokenId];
// When the token to delete is the last token, the swap operation is unnecessary. However, since this occurs so
// rarely (when the last minted token is burnt) that we still do the swap here to avoid the gas cost of adding
// an 'if' statement (like in _removeTokenFromOwnerEnumeration)
uint256 lastTokenId = _allTokens[lastTokenIndex];
_allTokens[tokenIndex] = lastTokenId; // Move the last token to the slot of the to-delete token
_allTokensIndex[lastTokenId] = tokenIndex; // Update the moved token's index
// This also deletes the contents at the last position of the array
_allTokens.length--;
_allTokensIndex[tokenId] = 0;
}
}
// File: openzeppelin-solidity/contracts/introspection/IERC165.sol
pragma solidity ^0.5.0;
/**
* @dev Interface of the ERC165 standard, as defined in the
* [EIP](https://eips.ethereum.org/EIPS/eip-165).
*
* Implementers can declare support of contract interfaces, which can then be
* queried by others (`ERC165Checker`).
*
* For an implementation, see `ERC165`.
*/
interface IERC165 {
/**
* @dev Returns true if this contract implements the interface defined by
* `interfaceId`. See the corresponding
* [EIP section](https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified)
* to learn more about how these ids are created.
*
* This function call must use less than 30 000 gas.
*/
function supportsInterface(bytes4 interfaceId) external view returns (bool);
}
// File: openzeppelin-solidity/contracts/token/ERC721/IERC721.sol
pragma solidity ^0.5.0;
import "./IERC165.sol";
/**
* @dev Required interface of an ERC721 compliant contract.
*/
contract IERC721 is IERC165 {
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
);
/**
* @dev Returns the number of NFTs in `owner`'s account.
*/
function balanceOf(address owner) public view returns (uint256 balance);
/**
* @dev Returns the owner of the NFT specified by `tokenId`.
*/
function ownerOf(uint256 tokenId) public view returns (address owner);
/**
* @dev Transfers a specific NFT (`tokenId`) from one account (`from`) to
* another (`to`).
*
*
*
* Requirements:
* - `from`, `to` cannot be zero.
* - `tokenId` must be owned by `from`.
* - If the caller is not `from`, it must be have been allowed to move this
* NFT by either `approve` or `setApproveForAll`.
*/
function safeTransferFrom(
address from,
address to,
uint256 tokenId
) public;
/**
* @dev Transfers a specific NFT (`tokenId`) from one account (`from`) to
* another (`to`).
*
* Requirements:
* - If the caller is not `from`, it must be approved to move this NFT by
* either `approve` or `setApproveForAll`.
*/
function transferFrom(
address from,
address to,
uint256 tokenId
) public;
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 safeTransferFrom(
address from,
address to,
uint256 tokenId,
bytes memory data
) public;
}
// File: openzeppelin-solidity/contracts/utils/Address.sol
pragma solidity ^0.5.0;
/**
* @dev Collection of functions related to the address type,
*/
library Address {
/**
* @dev Returns true if `account` is a contract.
*
* This test is non-exhaustive, and there may be false-negatives: during the
* execution of a contract's constructor, its address will be reported as
* not containing a contract.
*
* > It is unsafe to assume that an address for which this function returns
* false is an externally-owned account (EOA) and not a contract.
*/
function isContract(address account) internal view returns (bool) {
// This method relies in extcodesize, which returns 0 for contracts in
// construction, since the code is only stored at the end of the
// constructor execution.
uint256 size;
// solhint-disable-next-line no-inline-assembly
assembly {
size := extcodesize(account)
}
return size > 0;
}
}
// File: openzeppelin-solidity/contracts/drafts/Counters.sol
pragma solidity ^0.5.0;
import "./SafeMath.sol";
/**
* @title Counters
* @author Matt Condon (@shrugs)
* @dev Provides counters that can only be incremented or decremented by one. This can be used e.g. to track the number
* of elements in a mapping, issuing ERC721 ids, or counting request ids.
*
* Include with `using Counters for Counters.Counter;`
* Since it is not possible to overflow a 256 bit integer with increments of one, `increment` can skip the SafeMath
* overflow check, thereby saving gas. This does assume however correct usage, in that the underlying `_value` is never
* directly accessed.
*/
library Counters {
using SafeMath for uint256;
struct Counter {
// This variable should never be directly accessed by users of the library: interactions must be restricted to
// the library's function. As of Solidity v0.5.2, this cannot be enforced, though there is a proposal to add
// this feature: see https://github.com/ethereum/solidity/issues/4637
uint256 _value; // default: 0
}
function current(Counter storage counter) internal view returns (uint256) {
return counter._value;
}
function increment(Counter storage counter) internal {
counter._value += 1;
}
function decrement(Counter storage counter) internal {
counter._value = counter._value.sub(1);
}
}
// File: openzeppelin-solidity/contracts/token/ERC721/IERC721Receiver.sol
pragma solidity ^0.5.0;
/**
* @title ERC721 token receiver interface
* @dev Interface for any contract that wants to support safeTransfers
* from ERC721 asset contracts.
*/
contract IERC721Receiver {
function onERC721Received(
address operator,
address from,
uint256 tokenId,
bytes memory data
) public returns (bytes4);
}
// File: openzeppelin-solidity/contracts/token/ERC721/IERC721Enumerable.sol
pragma solidity ^0.5.0;
import "./IERC721.sol";
/**
* @title ERC-721 Non-Fungible Token Standard, optional enumeration extension
* @dev See https://eips.ethereum.org/EIPS/eip-721
*/
contract IERC721Enumerable is IERC721 {
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);
}