false
false
0

Contract Address Details

0xF7fCb28DdD819D9C6746BD40435d65Fbcf88bC89

Contract Name
CharityNFT
Creator
0x8c3a19–9a4721 at 0x3ba592–13a7c0
Balance
0 CLO
Tokens
Fetching tokens...
Transactions
Fetching transactions...
Transfers
Fetching transfers...
Gas Used
Fetching gas used...
Last Balance Update
16288958
Warning! Contract bytecode has been changed and doesn't match the verified one. Therefore, interaction with this smart contract may be risky.
Contract name:
CharityNFT




Optimization enabled
true
Compiler version
v0.8.19+commit.7dd6d404




Optimization runs
1000
EVM Version
default




Verified at
2024-09-26T15:25:13.793590Z

Contract source code

// SPDX-License-Identifier: GPL

pragma solidity ^0.8.0;
/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
 * available, which can be applied to functions to make sure there are no nested
 * (reentrant) calls to them.
 *
 * Note that because there is a single `nonReentrant` guard, functions marked as
 * `nonReentrant` may not call one another. This can be worked around by making
 * those functions `private`, and then adding `external` `nonReentrant` entry
 * points to them.
 *
 * TIP: If you would like to learn more about reentrancy and alternative ways
 * to protect against it, check out our blog post
 * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
 */
abstract contract ReentrancyGuard {
    // Booleans are more expensive than uint256 or any type that takes up a full
    // word because each write operation emits an extra SLOAD to first read the
    // slot's contents, replace the bits taken up by the boolean, and then write
    // back. This is the compiler's defense against contract upgrades and
    // pointer aliasing, and it cannot be disabled.

    // The values being non-zero value makes deployment a bit more expensive,
    // but in exchange the refund on every call to nonReentrant will be lower in
    // amount. Since refunds are capped to a percentage of the total
    // transaction's gas, it is best to keep them low in cases like this one, to
    // increase the likelihood of the full refund coming into effect.
    uint256 private constant _NOT_ENTERED = 1;
    uint256 private constant _ENTERED = 2;

    uint256 private _status;

    constructor() {
        _status = _NOT_ENTERED;
    }

    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and making it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        // On the first call to nonReentrant, _notEntered will be true
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

        // Any calls to nonReentrant after this point will fail
        _status = _ENTERED;

        _;

        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = _NOT_ENTERED;
    }
}

abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }
}

abstract contract Ownable is Context {
    address internal _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
        _;
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

abstract contract MinterRole is Ownable {
    mapping (address => bool) public minter_role;

    function setMinterRole(address _who, bool _status) public onlyOwner
    {
        minter_role[_who] = _status;
    }

    modifier onlyMinter
    {
        require(minter_role[msg.sender], "Minter role required");
        _;
    }
}

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;
    }
}

interface ICallistoNFT {

    event NewBid       (uint256 indexed tokenID, uint256 indexed bidAmount, bytes data);
    event NewPrice     (uint256 indexed tokenID, uint256 indexed priceValue, bytes data);
    event TokenTrade   (uint256 indexed tokenID, address indexed new_owner, address indexed previous_owner, uint256 priceInWEI);
    event Transfer     (address indexed from, address indexed to, uint256 indexed tokenId);
    event TransferData (bytes data);
    
    struct Properties {
        
        // In this example properties of the given NFT are stored
        // in a dynamically sized array of strings
        // properties can be re-defined for any specific info
        // that a particular NFT is intended to store.
        
        /* Properties could look like this:
        bytes   property1;
        bytes   property2;
        address property3;
        */
        
        string[] properties;
    }
    
    function name() external view returns (string memory);
    function symbol() external view returns (string memory);
    function standard() external view returns (string memory);
    function balanceOf(address _who) external view returns (uint256);
    function ownerOf(uint256 _tokenId) external view returns (address);
    function transfer(address _to, uint256 _tokenId, bytes calldata _data) external returns (bool);
    function silentTransfer(address _to, uint256 _tokenId) external returns (bool);
    
    function priceOf(uint256 _tokenId) external view returns (uint256);
    function bidOf(uint256 _tokenId) external view returns (uint256 price, address payable bidder, uint256 timestamp);
    function getTokenProperties(uint256 _tokenId) external view returns (Properties memory);
    
    function setBid(uint256 _tokenId, bytes calldata _data) payable external; // bid amount is defined by msg.value
    function setPrice(uint256 _tokenId, uint256 _amountInWEI, bytes calldata _data) external;
    function withdrawBid(uint256 _tokenId) external returns (bool);

    function getUserContent(uint256 _tokenId) external view returns (string memory _content);
    function setUserContent(uint256 _tokenId, string calldata _content) external returns (bool);
}

abstract contract NFTReceiver {
    function onERC721Received(address _operator, address _from, uint256 _tokenId, bytes calldata _data) external virtual returns(bytes4);
}

// ExtendedNFT is a version of the CallistoNFT standard token
// that implements a set of function for NFT content management
contract ExtendedNFT is ICallistoNFT, ReentrancyGuard {
    using Address for address;
    
    event TokenPropertyUpdated(uint tokenID, uint propertyID);

    mapping (uint256 => Properties) private _tokenProperties;
    
    uint256 public bidLock = 1 days; // Time required for a bid to become withdrawable.
    
    struct Bid {
        address payable bidder;
        uint256 amountInWEI;
        uint256 timestamp;
    }
    
    mapping (uint256 => uint256) private _asks; // tokenID => price of this token (in WEI)
    mapping (uint256 => Bid)     private _bids; // tokenID => price of this token (in WEI)

    uint256 public next_mint_id;

    // Token name
    string internal _name;

    // Token symbol
    string internal _symbol;

    // Mapping from token ID to owner address
    mapping(uint256 => address) internal _owners;

    // Mapping owner address to token count
    mapping(address => uint256) internal _balances;
    

    // Reward is always paid based on BID
    modifier checkTrade(uint256 _tokenId, bytes calldata _data)
    {
        _;
        (uint256 _bid, address payable _bidder,) = bidOf(_tokenId);
        if(priceOf(_tokenId) > 0 && priceOf(_tokenId) <= _bid)
        {
            emit TokenTrade(_tokenId, _bidder, ownerOf(_tokenId), _bid);

            bool sent = payable(ownerOf(_tokenId)).send(_bid);

            //bytes calldata _empty;
            delete _bids[_tokenId];
            delete _asks[_tokenId];
            _transfer(ownerOf(_tokenId), _bidder, _tokenId, _data);
        }
    }
    
    function standard() public view virtual override returns (string memory)
    {
        return "CallistoNFT";
    }

    function mint() internal returns (uint256 _mintedId)
    {
        _safeMint(msg.sender, next_mint_id);
        _mintedId = next_mint_id;
        next_mint_id++;

        _configureNFT(_mintedId);
    }
    
    function priceOf(uint256 _tokenId) public view virtual override returns (uint256)
    {
        address owner = _owners[_tokenId];
        require(owner != address(0), "NFT: owner query for nonexistent token");
        return _asks[_tokenId];
    }
    
    function bidOf(uint256 _tokenId) public view virtual override returns (uint256 price, address payable bidder, uint256 timestamp)
    {
        address owner = _owners[_tokenId];
        require(owner != address(0), "NFT: owner query for nonexistent token");
        return (_bids[_tokenId].amountInWEI, _bids[_tokenId].bidder, _bids[_tokenId].timestamp);
    }
    
    function getTokenProperties(uint256 _tokenId) public view virtual override returns (Properties memory)
    {
        return _tokenProperties[_tokenId];
    }

    function getTokenProperty(uint256 _tokenId, uint256 _propertyId)  public view virtual returns (string memory)
    {
        return _tokenProperties[_tokenId].properties[_propertyId];
    }

    function getUserContent(uint256 _tokenId) public view virtual override returns (string memory _content)
    {
        return (_tokenProperties[_tokenId].properties[0]);
    }

    function setUserContent(uint256 _tokenId, string calldata _content) public virtual override returns (bool success)
    {
        require(msg.sender == ownerOf(_tokenId), "NFT: only owner can change NFT content");
        _tokenProperties[_tokenId].properties[0] = _content;
        emit TokenPropertyUpdated(_tokenId, 0) ;
        return true;
    }

    function _addPropertyWithContent(uint256 _tokenId, string calldata _content) internal
    {
        // Check permission criteria

        _tokenProperties[_tokenId].properties.push(_content);

        uint newPropertyID = _tokenProperties[_tokenId].properties.length - 1;

        emit TokenPropertyUpdated(_tokenId, newPropertyID);
    }

    function _modifyProperty(uint256 _tokenId, uint256 _propertyId, string calldata _content) internal
    {
        _tokenProperties[_tokenId].properties[_propertyId] = _content;

        emit TokenPropertyUpdated(_tokenId, _propertyId);
    }

    function balanceOf(address owner) public view virtual override returns (uint256) {
        require(owner != address(0), "NFT: balance query for the zero address");
        return _balances[owner];
    }
    
    function ownerOf(uint256 tokenId) public view virtual override returns (address) {
        address owner = _owners[tokenId];
        require(owner != address(0), "NFT: owner query for nonexistent token");
        return owner;
    }
    
    /* 
        Price == 0, "NFT not on sale"
        Price > 0, "NFT on sale"
    */
    function setPrice(uint256 _tokenId, uint256 _amountInWEI, bytes calldata _data) checkTrade(_tokenId, _data) public virtual override nonReentrant {
        require(ownerOf(_tokenId) == msg.sender, "Setting asks is only allowed for owned NFTs!");
        _asks[_tokenId] = _amountInWEI;
        emit NewPrice(_tokenId, _amountInWEI, _data);
    }
    
    function setBid(uint256 _tokenId, bytes calldata _data) payable checkTrade(_tokenId, _data) public virtual override nonReentrant
    {
        (uint256 _previousBid, address payable _previousBidder, ) = bidOf(_tokenId);
        require(msg.value > _previousBid, "New bid must exceed the existing one");

        uint256 _bid;
        bool sent;
        // Return previous bid if the current one exceeds it.
        if(_previousBid != 0)
        {
            sent = _previousBidder.send(_previousBid);
        }
        // Refund overpaid amount if price is greater than 0
        if (priceOf(_tokenId) < msg.value && priceOf(_tokenId) > 0)
        {
            _bid = priceOf(_tokenId);
        }
        else
        {
            _bid = msg.value;
        }
        _bids[_tokenId].amountInWEI = _bid;
        _bids[_tokenId].bidder      = payable(msg.sender);
        _bids[_tokenId].timestamp   = block.timestamp;

        emit NewBid(_tokenId, _bid, _data);
        
        // Send back overpaid amount.
        // WARNING: Creates possibility for reentrancy.
        if (priceOf(_tokenId) < msg.value && priceOf(_tokenId) > 0)
        {
            sent = payable(msg.sender).send(msg.value - priceOf(_tokenId));
        }
    }
    
    function withdrawBid(uint256 _tokenId) public virtual override nonReentrant returns (bool) 
    {
        (uint256 _bid, address payable _bidder, uint256 _timestamp) = bidOf(_tokenId);
        require(msg.sender == _bidder, "Can not withdraw someone elses bid");
        require(block.timestamp > _timestamp + bidLock, "Bid is time-locked");
        
        bool sent = _bidder.send(_bid);
        delete _bids[_tokenId];
        emit NewBid(_tokenId, 0, "0x7769746864726177426964");
        return true;
    }
    
    function name() public view virtual override returns (string memory) {
        return _name;
    }
    
    function symbol() public view virtual override returns (string memory) {
        return _symbol;
    }
    
    function transfer(address _to, uint256 _tokenId, bytes calldata _data) public override returns (bool)
    {
        _transfer(msg.sender, _to, _tokenId, _data);
        emit TransferData(_data);
        return true;
    }
    
    function silentTransfer(address _to, uint256 _tokenId) public override returns (bool)
    {
        require(ExtendedNFT.ownerOf(_tokenId) == msg.sender, "NFT: transfer of token that is not own");
        require(_to != address(0), "NFT: transfer to the zero address");
        
        _asks[_tokenId] = 0; // Zero out price on transfer
        
        // When a user transfers the NFT to another user
        // it does not automatically mean that the new owner
        // would like to sell this NFT at a price
        // specified by the previous owner.
        
        // However bids persist regardless of token transfers
        // because we assume that the bidder still wants to buy the NFT
        // no matter from whom.

        _beforeTokenTransfer(msg.sender, _to, _tokenId);

        _balances[msg.sender] -= 1;
        _balances[_to] += 1;
        _owners[_tokenId] = _to;

        emit Transfer(msg.sender, _to, _tokenId);
        return true;
    }
    
    function _exists(uint256 tokenId) internal view virtual returns (bool) {
        return _owners[tokenId] != address(0);
    }
    
    function _safeMint(
        address to,
        uint256 tokenId
    ) internal virtual {
        _mint(to, tokenId);
    }
    
    function _mint(address to, uint256 tokenId) internal virtual {
        require(to != address(0), "NFT: mint to the zero address");
        require(!_exists(tokenId), "NFT: token already minted");

        _beforeTokenTransfer(address(0), to, tokenId);

        _balances[to] += 1;
        _owners[tokenId] = to;

        emit Transfer(address(0), to, tokenId);
    }
    
    function _burn(uint256 tokenId) internal virtual {
        address owner = ExtendedNFT.ownerOf(tokenId);

        _beforeTokenTransfer(owner, address(0), tokenId);
        

        _balances[owner] -= 1;
        delete _owners[tokenId];

        emit Transfer(owner, address(0), tokenId);
    }
    
    function _transfer(
        address from,
        address to,
        uint256 tokenId,
        bytes calldata data
    ) internal virtual {
        require(ExtendedNFT.ownerOf(tokenId) == from, "NFT: transfer of token that is not own");
        require(to != address(0), "NFT: transfer to the zero address");
        
        _asks[tokenId] = 0; // Zero out price on transfer
        
        // When a user transfers the NFT to another user
        // it does not automatically mean that the new owner
        // would like to sell this NFT at a price
        // specified by the previous owner.
        
        // However bids persist regardless of token transfers
        // because we assume that the bidder still wants to buy the NFT
        // no matter from whom.

        _beforeTokenTransfer(from, to, tokenId);

        _balances[from] -= 1;
        _balances[to] += 1;
        _owners[tokenId] = to;

        if(to.isContract())
        {
            NFTReceiver(to).onERC721Received(msg.sender, from, tokenId, data);
        }

        emit Transfer(from, to, tokenId);
    }
    
    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 tokenId
    ) internal virtual {}

    function _configureNFT(uint256 _tokenId) internal
    {
        if(_tokenProperties[_tokenId].properties.length == 0)
        {
            _tokenProperties[_tokenId].properties.push("");
        }
    }
}

interface IClassifiedNFT is ICallistoNFT {
    function setClassForTokenID(uint256 _tokenID, uint256 _tokenClass) external;
    function addNewTokenClass(string memory _property) external;
    function addTokenClassProperties(uint256 _propertiesCount, uint256 classId) external;
    function modifyClassProperty(uint256 _classID, uint256 _propertyID, string memory _content) external;
    function getClassProperty(uint256 _classID, uint256 _propertyID) external view returns (string memory);
    function addClassProperty(uint256 _classID) external;
    function getClassProperties(uint256 _classID) external view returns (string[] memory);
    function getClassForTokenID(uint256 _tokenID) external view returns (uint256);
    function getClassPropertiesForTokenID(uint256 _tokenID) external view returns (string[] memory);
    function getClassPropertyForTokenID(uint256 _tokenID, uint256 _propertyID) external view returns (string memory);
    function mintWithClass(uint256 classId)  external  returns (uint256 _newTokenID);
    function appendClassProperty(uint256 _classID, uint256 _propertyID, string memory _content) external;
}

abstract contract ClassifiedNFT is MinterRole, ExtendedNFT, IClassifiedNFT {

    event ClassPropertyUpdated(uint classID, uint propertyID);
    event TokenClassChanged(uint _tokenID, uint _tokenClass);

    mapping (uint256 => string[]) public class_properties;
    mapping (uint256 => uint256)  public token_classes;

    uint256 public nextClassIndex = 0;

    modifier onlyExistingClasses(uint256 classId)
    {
        require(classId < nextClassIndex, "Queried class does not exist");
        _;
    }

    function setClassForTokenID(uint256 _tokenID, uint256 _tokenClass) public onlyOwner override
    {
        token_classes[_tokenID] = _tokenClass;
    }

    function addNewTokenClass(string memory _property) public onlyOwner override
    {
        class_properties[nextClassIndex].push(_property);

        emit ClassPropertyUpdated(nextClassIndex, 0); 

        nextClassIndex++;
    }

    function addTokenClassProperties(uint256 _propertiesCount, uint256 classId) public onlyOwner override
    {
        for (uint i = 0; i < _propertiesCount; i++)
        {
            class_properties[classId].push("");
        }
    }

    function modifyClassProperty(uint256 _classID, uint256 _propertyID, string memory _content) public onlyOwner onlyExistingClasses(_classID) override
    {
        class_properties[_classID][_propertyID] = _content;

        emit ClassPropertyUpdated(_classID, _propertyID);    
    }

    function getClassProperty(uint256 _classID, uint256 _propertyID) public view onlyExistingClasses(_classID) override returns (string memory)
    {
        return class_properties[_classID][_propertyID];
    }

    function addClassProperty(uint256 _classID) public onlyOwner onlyExistingClasses(_classID) override
    {
        class_properties[_classID].push("");
    }

    function addClassPropertyWithContent(uint256 _classID, string memory _content) public onlyOwner onlyExistingClasses(_classID)
    {
        class_properties[_classID].push(_content);

        uint newPropertyID = class_properties[_classID].length - 1;

        emit ClassPropertyUpdated(_classID, newPropertyID);    
    }

    function getClassProperties(uint256 _classID) public view onlyExistingClasses(_classID) override returns (string[] memory)
    {
        return class_properties[_classID];
    }

    function getClassForTokenID(uint256 _tokenID) public view onlyExistingClasses(token_classes[_tokenID]) override returns (uint256)
    {
        return token_classes[_tokenID];
    }

    function getClassPropertiesForTokenID(uint256 _tokenID) public view onlyExistingClasses(token_classes[_tokenID]) override returns (string[] memory)
    {
        return class_properties[token_classes[_tokenID]];
    }

    function getClassPropertyForTokenID(uint256 _tokenID, uint256 _propertyID) public view onlyExistingClasses(token_classes[_tokenID]) override returns (string memory)
    {
        return class_properties[token_classes[_tokenID]][_propertyID];
    }
    
    function mintWithClass(uint256 classId)  public onlyExistingClasses(classId) onlyMinter override returns (uint256 _newTokenID)
    {
        //_mint(to, tokenId);
        _newTokenID = mint();
        token_classes[_newTokenID] = classId;
    }

    function appendClassProperty(uint256 _classID, uint256 _propertyID, string memory _content) public onlyOwner onlyExistingClasses(_classID) override{}

}

contract CharityNFT is ExtendedNFT, ClassifiedNFT {

    function initialize(string memory name_, string memory symbol_) external {
        require(_owner == address(0), "Already initialized");
        _owner = msg.sender;
        emit OwnershipTransferred(address(0), msg.sender);
        bidLock = 1 days;
        _name   = name_;
        _symbol = symbol_;
    }

    function addPropertyWithContent(uint256 _tokenId, string calldata _content) public onlyMinter
    {
        _addPropertyWithContent( _tokenId, _content);
    }
}

contract ActivatedByOwner is Ownable {
    bool public active = true;

    function setActive(bool _active) public  onlyOwner
    {
        active = _active;
    }

    modifier onlyActive
    {
        require(active, "This contract is deactivated by owner");
        _;
    }
}

contract NFTMulticlassPermissiveAuction is ActivatedByOwner {

    event AuctionCreated(uint256 indexed tokenClassAuctionID, uint256 timestamp);
    event TokenSold(uint256 indexed tokenID, uint256 indexed tokenClassID, address indexed buyer);
    event NFTContractSet(address indexed newNFTContract, address indexed oldNFTContract);
    event RevenueWithdrawal(uint256 amount);
    

    address public nft_contract;

    struct NFTAuctionClass
    {
        uint256 amount_sold;
        uint256 start_timestamp;
        uint256 priceInWei;
    }

    mapping (uint256 => NFTAuctionClass) public auctions; // Mapping from classID (at NFT contract) to set of variables
                                                          //  defining the auction for this token class.

    address payable public revenue = payable(0x01000B5fE61411C466b70631d7fF070187179Bbf); // This address has the rights to withdraw funds from the auction.

    constructor()
    {
        _owner = msg.sender;
    }

    function createNFTAuction(
        uint256 _classID, 
        uint256 _start_timestamp,
        uint256 _priceInWei
        ) public onlyOwner
    {
        auctions[_classID].amount_sold     = 0; 
        auctions[_classID].start_timestamp = _start_timestamp;
        auctions[_classID].priceInWei = _priceInWei;

        emit AuctionCreated(_classID, block.timestamp);
    }

    function setRevenueAddress(address payable _revenue_address) public  onlyOwner {
        revenue = _revenue_address;
    }

    function setNFTContract(address _nftContract) public onlyOwner
    {
        emit NFTContractSet(_nftContract, nft_contract);

        nft_contract = _nftContract;
    }

    receive() external payable {}

    function buyNFT(uint _classID) public payable onlyActive
    {
        require(msg.value >= auctions[_classID].priceInWei, "Insufficient funds");

        uint256 _mintedId = ClassifiedNFT(nft_contract).mintWithClass(_classID);
        auctions[_classID].amount_sold++;
        configureNFT(_mintedId);

        ClassifiedNFT(nft_contract).transfer(msg.sender, _mintedId, "");

        emit TokenSold(_mintedId, _classID, msg.sender);
    }

    function configureNFT(uint256 _tokenId) internal
    {
        CharityNFT(nft_contract).addPropertyWithContent(_tokenId, string(abi.encodePacked("Donated: ", toString(msg.value / 1e18), " CLO at ", toString(block.timestamp))));
    }

    function withdrawRevenue() public
    {
        require(msg.sender == revenue, "This action requires revenue permission");

        emit RevenueWithdrawal(address(this).balance);

        bool sent = revenue.send(address(this).balance);
    }

    function toString(uint256 value) internal pure returns (string memory) {
        // Inspired by OraclizeAPI's implementation - MIT licence
        // https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/utils/Strings.sol#L15-L35

        if (value == 0) {
            return "0";
        }
        uint256 temp = value;
        uint256 digits;
        while (temp != 0) {
            digits++;
            temp /= 10;
        }
        bytes memory buffer = new bytes(digits);
        while (value != 0) {
            digits -= 1;
            buffer[digits] = bytes1(uint8(48 + uint256(value % 10)));
            value /= 10;
        }
        return string(buffer);
    }
}

Contract ABI

[{"type":"event","name":"ClassPropertyUpdated","inputs":[{"type":"uint256","name":"classID","internalType":"uint256","indexed":false},{"type":"uint256","name":"propertyID","internalType":"uint256","indexed":false}],"anonymous":false},{"type":"event","name":"NewBid","inputs":[{"type":"uint256","name":"tokenID","internalType":"uint256","indexed":true},{"type":"uint256","name":"bidAmount","internalType":"uint256","indexed":true},{"type":"bytes","name":"data","internalType":"bytes","indexed":false}],"anonymous":false},{"type":"event","name":"NewPrice","inputs":[{"type":"uint256","name":"tokenID","internalType":"uint256","indexed":true},{"type":"uint256","name":"priceValue","internalType":"uint256","indexed":true},{"type":"bytes","name":"data","internalType":"bytes","indexed":false}],"anonymous":false},{"type":"event","name":"OwnershipTransferred","inputs":[{"type":"address","name":"previousOwner","internalType":"address","indexed":true},{"type":"address","name":"newOwner","internalType":"address","indexed":true}],"anonymous":false},{"type":"event","name":"TokenClassChanged","inputs":[{"type":"uint256","name":"_tokenID","internalType":"uint256","indexed":false},{"type":"uint256","name":"_tokenClass","internalType":"uint256","indexed":false}],"anonymous":false},{"type":"event","name":"TokenPropertyUpdated","inputs":[{"type":"uint256","name":"tokenID","internalType":"uint256","indexed":false},{"type":"uint256","name":"propertyID","internalType":"uint256","indexed":false}],"anonymous":false},{"type":"event","name":"TokenTrade","inputs":[{"type":"uint256","name":"tokenID","internalType":"uint256","indexed":true},{"type":"address","name":"new_owner","internalType":"address","indexed":true},{"type":"address","name":"previous_owner","internalType":"address","indexed":true},{"type":"uint256","name":"priceInWEI","internalType":"uint256","indexed":false}],"anonymous":false},{"type":"event","name":"Transfer","inputs":[{"type":"address","name":"from","internalType":"address","indexed":true},{"type":"address","name":"to","internalType":"address","indexed":true},{"type":"uint256","name":"tokenId","internalType":"uint256","indexed":true}],"anonymous":false},{"type":"event","name":"TransferData","inputs":[{"type":"bytes","name":"data","internalType":"bytes","indexed":false}],"anonymous":false},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"addClassProperty","inputs":[{"type":"uint256","name":"_classID","internalType":"uint256"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"addClassPropertyWithContent","inputs":[{"type":"uint256","name":"_classID","internalType":"uint256"},{"type":"string","name":"_content","internalType":"string"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"addNewTokenClass","inputs":[{"type":"string","name":"_property","internalType":"string"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"addPropertyWithContent","inputs":[{"type":"uint256","name":"_tokenId","internalType":"uint256"},{"type":"string","name":"_content","internalType":"string"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"addTokenClassProperties","inputs":[{"type":"uint256","name":"_propertiesCount","internalType":"uint256"},{"type":"uint256","name":"classId","internalType":"uint256"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"appendClassProperty","inputs":[{"type":"uint256","name":"_classID","internalType":"uint256"},{"type":"uint256","name":"_propertyID","internalType":"uint256"},{"type":"string","name":"_content","internalType":"string"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"balanceOf","inputs":[{"type":"address","name":"owner","internalType":"address"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"bidLock","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"price","internalType":"uint256"},{"type":"address","name":"bidder","internalType":"address payable"},{"type":"uint256","name":"timestamp","internalType":"uint256"}],"name":"bidOf","inputs":[{"type":"uint256","name":"_tokenId","internalType":"uint256"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"string","name":"","internalType":"string"}],"name":"class_properties","inputs":[{"type":"uint256","name":"","internalType":"uint256"},{"type":"uint256","name":"","internalType":"uint256"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"getClassForTokenID","inputs":[{"type":"uint256","name":"_tokenID","internalType":"uint256"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"string[]","name":"","internalType":"string[]"}],"name":"getClassProperties","inputs":[{"type":"uint256","name":"_classID","internalType":"uint256"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"string[]","name":"","internalType":"string[]"}],"name":"getClassPropertiesForTokenID","inputs":[{"type":"uint256","name":"_tokenID","internalType":"uint256"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"string","name":"","internalType":"string"}],"name":"getClassProperty","inputs":[{"type":"uint256","name":"_classID","internalType":"uint256"},{"type":"uint256","name":"_propertyID","internalType":"uint256"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"string","name":"","internalType":"string"}],"name":"getClassPropertyForTokenID","inputs":[{"type":"uint256","name":"_tokenID","internalType":"uint256"},{"type":"uint256","name":"_propertyID","internalType":"uint256"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"tuple","name":"","internalType":"struct ICallistoNFT.Properties","components":[{"type":"string[]","name":"properties","internalType":"string[]"}]}],"name":"getTokenProperties","inputs":[{"type":"uint256","name":"_tokenId","internalType":"uint256"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"string","name":"","internalType":"string"}],"name":"getTokenProperty","inputs":[{"type":"uint256","name":"_tokenId","internalType":"uint256"},{"type":"uint256","name":"_propertyId","internalType":"uint256"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"string","name":"_content","internalType":"string"}],"name":"getUserContent","inputs":[{"type":"uint256","name":"_tokenId","internalType":"uint256"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"initialize","inputs":[{"type":"string","name":"name_","internalType":"string"},{"type":"string","name":"symbol_","internalType":"string"}]},{"type":"function","stateMutability":"nonpayable","outputs":[{"type":"uint256","name":"_newTokenID","internalType":"uint256"}],"name":"mintWithClass","inputs":[{"type":"uint256","name":"classId","internalType":"uint256"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"bool","name":"","internalType":"bool"}],"name":"minter_role","inputs":[{"type":"address","name":"","internalType":"address"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"modifyClassProperty","inputs":[{"type":"uint256","name":"_classID","internalType":"uint256"},{"type":"uint256","name":"_propertyID","internalType":"uint256"},{"type":"string","name":"_content","internalType":"string"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"string","name":"","internalType":"string"}],"name":"name","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"nextClassIndex","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"next_mint_id","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"address","name":"","internalType":"address"}],"name":"owner","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"address","name":"","internalType":"address"}],"name":"ownerOf","inputs":[{"type":"uint256","name":"tokenId","internalType":"uint256"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"priceOf","inputs":[{"type":"uint256","name":"_tokenId","internalType":"uint256"}]},{"type":"function","stateMutability":"payable","outputs":[],"name":"setBid","inputs":[{"type":"uint256","name":"_tokenId","internalType":"uint256"},{"type":"bytes","name":"_data","internalType":"bytes"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"setClassForTokenID","inputs":[{"type":"uint256","name":"_tokenID","internalType":"uint256"},{"type":"uint256","name":"_tokenClass","internalType":"uint256"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"setMinterRole","inputs":[{"type":"address","name":"_who","internalType":"address"},{"type":"bool","name":"_status","internalType":"bool"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"setPrice","inputs":[{"type":"uint256","name":"_tokenId","internalType":"uint256"},{"type":"uint256","name":"_amountInWEI","internalType":"uint256"},{"type":"bytes","name":"_data","internalType":"bytes"}]},{"type":"function","stateMutability":"nonpayable","outputs":[{"type":"bool","name":"success","internalType":"bool"}],"name":"setUserContent","inputs":[{"type":"uint256","name":"_tokenId","internalType":"uint256"},{"type":"string","name":"_content","internalType":"string"}]},{"type":"function","stateMutability":"nonpayable","outputs":[{"type":"bool","name":"","internalType":"bool"}],"name":"silentTransfer","inputs":[{"type":"address","name":"_to","internalType":"address"},{"type":"uint256","name":"_tokenId","internalType":"uint256"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"string","name":"","internalType":"string"}],"name":"standard","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"string","name":"","internalType":"string"}],"name":"symbol","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"token_classes","inputs":[{"type":"uint256","name":"","internalType":"uint256"}]},{"type":"function","stateMutability":"nonpayable","outputs":[{"type":"bool","name":"","internalType":"bool"}],"name":"transfer","inputs":[{"type":"address","name":"_to","internalType":"address"},{"type":"uint256","name":"_tokenId","internalType":"uint256"},{"type":"bytes","name":"_data","internalType":"bytes"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"transferOwnership","inputs":[{"type":"address","name":"newOwner","internalType":"address"}]},{"type":"function","stateMutability":"nonpayable","outputs":[{"type":"bool","name":"","internalType":"bool"}],"name":"withdrawBid","inputs":[{"type":"uint256","name":"_tokenId","internalType":"uint256"}]}]

Contract Creation Code

Verify & Publish 
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