ETH Price: $3,370.53 (+5.56%)
Gas: 11 Gwei

Token

SxTCommunityNFT (SxTC)
 

Overview

Max Total Supply

420 SxTC

Holders

367

Market

Volume (24H)

0.8601 ETH

Min Price (24H)

$572.99 @ 0.170000 ETH

Max Price (24H)

$1,145.98 @ 0.340000 ETH
0xd805fbaaac25f6ba6264ad1626b20d5a1e9f9a9c
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# Exchange Pair Price  24H Volume % Volume

Contract Source Code Verified (Exact Match)

Contract Name:
SxTCommunity

Compiler Version
v0.8.7+commit.e28d00a7

Optimization Enabled:
Yes with 200 runs

Other Settings:
default evmVersion
File 1 of 17 : SxTCommunity.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.7;

import "./interfaces/ISxTCommunity.sol";

contract SxTCommunity is ISxTCommunity, SxTCommunityStorage, ERC1155, Ownable, ReentrancyGuard, Pausable {
    using Counters for Counters.Counter;

    // Counter for maintaining TokenIDs
    Counters.Counter public currentTokenIndex;
    
    /// @dev This is the constructor function to initialize the contract.
    /// @param tokenName Name of the ERC1155 token
    /// @param tokenSymbol Symbol of the ERC1155 token

    constructor(string memory tokenName, string memory tokenSymbol) ERC1155("") {
        require(!compareStrings(tokenName, ""), "SxTCommunity: Token name cannot be an empty string");
        require(!compareStrings(tokenSymbol, ""), "SxTCommunity: Token symbol cannot be an empty string");
        name = tokenName;
        symbol = tokenSymbol;
    }

    /// @dev This is the function to get the URI for an NFT token 
    /// @param id ID of NFT token for which URI needs to be fetched 
    /// @return tokenUri URI of the NFT with required id

    function uri(uint id) public view override returns (string memory) {
        require(!compareStrings(tokenDetails[id].tokenUri, ""), "SxTCommunity: URI nonexistent token");
        return tokenDetails[id].tokenUri;
    }

    /// @dev This is the function to get the list of available or sold-out NFTs in a paginated JSON string response  
    /// @param pageNumber Page number of the response required
    /// @param pageSize Size of each page of response required
    /// @param isAvailable Category of NFTs to get, true for available to mint NFTs, and false for sold out NFTs 
    /// @return nftsResponseJSON Stringified JSON response having the list of NFT details according to page number, page size, isAvailable( Available for mint or sold-out) 
    /// @return allAcceptableNFTsCount Count of all available or sold-out ( depending on isAvailable param passed) NFTs that the contract has

    function retrieveNFTs(uint256 pageNumber, uint256 pageSize, bool isAvailable) external override view returns(string memory, uint256) {
        string memory nftsResponseJSON = "[]";
        uint256 allAcceptableNFTsCount = 0;
        Token [] memory resultTokens = new Token[](pageSize);
        Token [] memory allAcceptableTokens = new Token[](currentTokenIndex.current());
        for ( uint256 i = currentTokenIndex.current(); i > 0; i--){
            if(isAvailable != checkMaxSupplyReached(i)){
                Token storage tokenTemp = tokenDetails[i];
                allAcceptableTokens[allAcceptableNFTsCount] = tokenTemp;
                allAcceptableNFTsCount++;
            }
        }
        if(pageNumber == 0 || pageSize == 0 ){
            return (nftsResponseJSON, allAcceptableNFTsCount);
        }
        uint256 startIndex = ((pageNumber - 1) * pageSize);
        uint256 endIndex = startIndex + pageSize;
        if(startIndex >= currentTokenIndex.current()){
            return (nftsResponseJSON, allAcceptableNFTsCount);
        }
        if(endIndex > currentTokenIndex.current()){
            endIndex = currentTokenIndex.current();
        }
        for ( uint256 j = startIndex; j < endIndex; j++){
            resultTokens[j - startIndex] = allAcceptableTokens[j];
        }
        nftsResponseJSON = getJSONResponse(resultTokens);
        return (nftsResponseJSON, allAcceptableNFTsCount);
    }
    
    /// @dev This is the function to set the price in ethers for an NFT token 
    /// @dev Only the owner can call this function
    /// @param id ID of NFT token for which token price needs to be updated
    /// @param newTokenEthPrice New price in ethers for the NFT token

    function setTokenEthPrice(uint256 id, uint256 newTokenEthPrice) external override onlyOwner  {
        require(!compareStrings(tokenDetails[id].tokenUri, ""), "SxTCommunity: URI nonexistent token");
        require(tokenDetails[id].ethPrice != newTokenEthPrice, "SxTCommunity: New price same as old price");
        require(newTokenEthPrice > 0, "SxTCommunity: New price cannot be zero");
        Token storage token = tokenDetails[id];
        token.hasPrice = true;
        token.ethPrice= newTokenEthPrice;
        emit TokenEthPriceSet(id, token.ethPrice);
    }

    /// @dev This is the function to set the price in ERC20 tokens for an NFT token 
    /// @dev Only the owner can call this function
    /// @param id ID of NFT token for which token price needs to be updated
    /// @param newTokenERC20Price New price in ERC20 tokens for the NFT token

    function setTokenERC20Price(uint256 id, uint256 newTokenERC20Price) external override onlyOwner  {
        require(!compareStrings(tokenDetails[id].tokenUri, ""), "SxTCommunity: URI nonexistent token");
        require(tokenDetails[id].erc20Price != newTokenERC20Price, "SxTCommunity: New price same as old price");
        require(newTokenERC20Price > 0, "SxTCommunity: New price cannot be zero");
        Token storage token = tokenDetails[id];
        token.hasPrice = true;
        token.erc20Price= newTokenERC20Price;
        emit TokenERC20PriceSet(id, token.erc20Price);
    }

    /// @dev This is the function to reset the prices for an NFT token 
    /// @dev Only the owner can call this function
    /// @param id ID of NFT token for which token prices need to be updated

    function resetTokenPrices(uint256 id) external override onlyOwner  {
        require(!compareStrings(tokenDetails[id].tokenUri, ""), "SxTCommunity: URI nonexistent token");
        require(tokenDetails[id].hasPrice, "SxTCommunity: This token is already available for free");
        Token storage token = tokenDetails[id];
        token.hasPrice = false;
        token.erc20Price = 0;
        token.ethPrice = 0;
        emit TokenPriceReset(id);
    }
    
    /// @dev This is the function to set the ERC20 token for accepting price of NFTs 
    /// @dev Only the owner can call this function
    /// @param newSxtToken Address of the particular ERC20 token, for accepting price of NFTs in ERC20 tokens

    function setERC20Token(IERC20 newSxtToken) external override onlyOwner  {
        require(address(newSxtToken) != ZERO_ADDRESS, "SxTCommunity: Address Cannot be Zero Address");
        require(keccak256(abi.encodePacked(newSxtToken)) != keccak256(abi.encodePacked(sxtToken)), "SxTCommunity: Current token is already what you have selected");
        sxtToken = newSxtToken;
        emit Erc20TokenSet(newSxtToken);
    }

    /// @dev This is the function to mint a new NFT token which is available free of cost
    /// @dev Only called when contract is unpaused
    /// @param id ID of NFT token to be bought
    /// @param to Address to which NFT token should be minted to

    function mintNFT(uint256 id, address to) external override whenNotPaused nonReentrant{   
        require(!compareStrings(tokenDetails[id].tokenUri, ""), "SxTCommunity: URI nonexistent token");    
        require(!tokenDetails[id].hasPrice, "SxTCommunity: This token is not free");
        require(!checkMaxSupplyReached(id), "SxTCommunity: Total supply exceeded maximum supply");
        require(!isPreviouslyMintedFrom[id][to], "SxTCommunity: Already minted this NFT once to this account");
        isPreviouslyMintedFrom[id][to] = true;
        Token storage currentToken = tokenDetails[id];
        currentToken.currentTokenSupply += 1;
        _mint(to, id, AMOUNT_BUYABLE, "");
        emit NftMinted(id, to);
    }

    /// @dev This is the function to mint a new NFT token by depositing Ethers
    /// @dev Only called when contract is unpaused
    /// @dev If Token is buyable with Ether and ethPrice > 0, function will accept ethers
    /// @param id ID of NFT token to be bought
    /// @param to Address to which NFT token should be minted to

    function mintNFTUsingEth(uint256 id, address to) external override payable whenNotPaused nonReentrant{
        require(!compareStrings(tokenDetails[id].tokenUri, ""), "SxTCommunity: URI nonexistent token");  
        require(tokenDetails[id].hasPrice && tokenDetails[id].ethPrice > 0, "SxTCommunity: Token Eth Price not yet set");     
        require(!checkMaxSupplyReached(id), "SxTCommunity: Total supply exceeded maximum supply");
        require(!isPreviouslyMintedFrom[id][to], "SxTCommunity: Already minted this NFT once to this account");
        require(msg.value >= tokenDetails[id].ethPrice, "SxTCommunity: Insufficient Ethers sent");
        isPreviouslyMintedFrom[id][to] = true;
        Token storage currentToken = tokenDetails[id];
        currentToken.currentTokenSupply += 1;
        _mint(to, id, AMOUNT_BUYABLE, "");
        emit NftMintedUsingEth(id, to, tokenDetails[id].ethPrice );
    }

    /// @dev This is the function to mint a new NFT token by depositing ERC20 Token
    /// @dev Only called when contract is unpaused
    /// @dev If Token is buyable with ERC20 token and erc20Price > 0, function will transfer ERC20 tokens to contract
    /// @param id ID of NFT token to be bought
    /// @param to Address to which NFT token should be minted to

    function mintNFTUsingERC20(uint256 id, address to) external override whenNotPaused nonReentrant{
        require(address(sxtToken) != ZERO_ADDRESS, "SxTCommunity: ERC20 Token not yet set by owner");
        require(!compareStrings(tokenDetails[id].tokenUri, ""), "SxTCommunity: URI nonexistent token");
        require(tokenDetails[id].hasPrice && tokenDetails[id].erc20Price > 0, "SxTCommunity: Token ERC20 Price not yet set");     
        require(!checkMaxSupplyReached(id), "SxTCommunity: Total supply exceeded maximum supply");
        require(!isPreviouslyMintedFrom[id][to], "SxTCommunity: Already minted this NFT once to this account");
        require(sxtToken.balanceOf(msg.sender) >= tokenDetails[id].erc20Price, "SxTCommunity: Insufficient ERC20 token balance");
        isPreviouslyMintedFrom[id][to] = true;
        bool sent = sxtToken.transferFrom(msg.sender, address(this), tokenDetails[id].erc20Price);
        require(sent, "SxTCommunity: Failed to send ERC20Token");
        Token storage currentToken = tokenDetails[id];
        currentToken.currentTokenSupply += 1;
        _mint(to, id, AMOUNT_BUYABLE, "");
        emit NftMintedUsingERC20(id, to, tokenDetails[id].erc20Price);
    }

    /// @dev This is the function to add new NFT tokens in the contract
    /// @dev Only the owner can call this function
    /// @param newTokenURIs Array of URIs for NFTs to be added
    /// @param hasPrices Array of boolean flags representing whether the NFT token has any price or not
    /// @param newEthPrices Array of prices in Ethers for NFTs to be added
    /// @param newERC20Prices Array of prices in ERC20 Tokens for NFTs to be added
    /// @param maxNewTokenSupplies Array of maximum possible supplies for NFTs to be added

    function addNewNFTs(string [] memory newTokenURIs, bool [] memory hasPrices, uint256 [] memory newEthPrices, uint256 [] memory newERC20Prices, uint256 [] memory maxNewTokenSupplies) external override onlyOwner {
        require(newTokenURIs.length == maxNewTokenSupplies.length && maxNewTokenSupplies.length == hasPrices.length && hasPrices.length == newEthPrices.length && newEthPrices.length == newERC20Prices.length, "SxTCommunity: Array lengths should be same");
        for(uint256 index = 0; index < maxNewTokenSupplies.length; index++){
            Token memory newToken;
            require(maxNewTokenSupplies[index] > 0, "SxTCommunity: Maximum supply cannot be 0");
            require(!compareStrings(newTokenURIs[index], ""), "SxTCommunity: URI cannot be empty string");
            currentTokenIndex.increment();
            uint256 newTokenIndex = currentTokenIndex.current();
            newToken.id = newTokenIndex;
            newToken.tokenUri = newTokenURIs[index];
            newToken.maxTokenSupply = maxNewTokenSupplies[index];
            newToken.hasPrice = hasPrices[index];
            if(hasPrices[index]) {
                require(newEthPrices[index] > 0 || newERC20Prices[index] > 0, "SxTCommunity: Both prices cannot be 0 since NFT hasPrice is true");
                newToken.ethPrice = newEthPrices[index];
                newToken.erc20Price = newERC20Prices[index];
            }
            tokenDetails[newTokenIndex] = newToken;
            emit NewNFTAdded(newTokenIndex);
        }
    }

    /// @dev This is the internal function to check if maximum supply reached for an NFT
    /// @dev This is called inside mintNFT, mintNFTUsingEth, mintNFTUsingERC20 functions
    /// @param id ID of NFT token to be checked

    function checkMaxSupplyReached(uint256 id) view internal returns(bool){
        if(tokenDetails[id].currentTokenSupply < tokenDetails[id].maxTokenSupply)
            return false;
        return true;
    }

    /// @dev This is the internal function to compare 2 strings
    /// @param s1 First string for comparing value
    /// @param s2 Second string for comparing value

    function compareStrings(string memory s1, string memory s2) internal pure returns (bool) {
        return (keccak256(abi.encodePacked(s1)) == keccak256(abi.encodePacked(s2)));
    }

    /// @dev This is the function to withdraw ethers from contract
    /// @dev Only the owner can call this function

    function withdrawEth() external override onlyOwner nonReentrant {
        uint256 amount = address(this).balance;
        address payable to = payable(msg.sender);
        require(amount > 0, "SxTCommunity: Zero ether balance");
        to.transfer(amount);
        emit EtherWithdrawn( amount, to);        
    }

    /// @dev This is the function to withdraw ERC20 Tokens from contract
    /// @dev Only the owner can call this function    

    function withdrawERC20() external override onlyOwner nonReentrant {
        uint256 amount = sxtToken.balanceOf(address(this));
        address to = msg.sender;
        require(amount > 0, "SxTCommunity: Zero ERC20 token balance");
        bool sent = sxtToken.transfer(to, amount);
        require(sent, "Failed to send ERC20Token");
        emit Erc20TokenWithdrawn(amount, to);
    }

    /// @dev This is the function to pause the contract

    function pause() external override onlyOwner {
        _pause();
    }

    /// @dev This is the function to unpause the contract

    function unpause() external override onlyOwner {
        _unpause();
    }
}

File 2 of 17 : ISxTCommunity.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.7;

import "../SxTCommunityStorage.sol";

interface ISxTCommunity {

    /// @dev This is the event to notify that price in ethers of an NFT is set
    /// @param id ID of NFT token for which token price is updated
    /// @param newTokenEthPrice New price in ethers set for the NFT token
    
    event TokenEthPriceSet(uint256 id, uint256 newTokenEthPrice);

    /// @dev This is the event to notify that price in ERC20 tokens of an NFT is set
    /// @param id ID of NFT token for which token price is updated
    /// @param newTokenERC20Price New price in ERC20 tokens set for the NFT token
    
    event TokenERC20PriceSet(uint256 id, uint256 newTokenERC20Price);

    /// @dev This is the event to notify that prices of an NFT are reset to zero
    /// @param id ID of NFT token for which token pricse are updated
    event TokenPriceReset(uint256 id);

    /// @dev This is the event to notify that an ERC20 token for buying NFTs is set.
    /// @param sXtToken Address of the ERC20 token set

    event Erc20TokenSet(IERC20 sXtToken);

    /// @dev This is the event to notify that an NFT token is bought free of cost.
    /// @param id ID of NFT token bought
    /// @param to Address of the NFT buyer  

    event NftMinted(uint256 id, address to);

    /// @dev This is the event to notify that an NFT token is bought using ethers.
    /// @param id ID of NFT token bought
    /// @param to Address of the NFT buyer  
    /// @param tokenPrice Price for the NFT token bought

    event NftMintedUsingEth(uint256 id, address to, uint256 tokenPrice);

    /// @dev This is the event to notify that an NFT token is bought using ERC20 tokens.
    /// @param id ID of NFT token bought
    /// @param to Address of the NFT buyer  
    /// @param tokenPrice Price for the NFT token bought

    event NftMintedUsingERC20(uint256 id, address to, uint256 tokenPrice);

    /// @dev This is the event to notify that a new NFT token has been added in contract
    /// @param id ID of NFT token added

    event NewNFTAdded(uint256 id);

    /// @dev This is the event to notify that all ethers are withdrawn from contract by owner.
    /// @param amount Amount of ethers withdrawn
    /// @param to Address of the owner to which ethers are sent

    event EtherWithdrawn(uint256 amount, address payable to);

    /// @dev This is the event to notify that all ERC20 tokens are withdrawn from contract by owner.
    /// @param amount Amount of tokens withdrawn
    /// @param to Address of the owner to which ERC20 tokens are transferred

    event Erc20TokenWithdrawn(uint256 amount, address to);

    /// @dev This is the function to get the list of available or sold-out NFTs in a paginated JSON string response  
    /// @param pageNumber Page number of the response required
    /// @param pageSize Size of each page of response required
    /// @param isAvailable Category of NFTs to get, true for available to mint NFTs, and false for sold out NFTs 
    /// @return nftsResponseJSON Stringified JSON response having the list of NFT details according to page number, page size, isAvailable( Available for mint or sold-out) 
    /// @return allAcceptableNFTsCount Count of all available or sold-out ( depending on isAvailable param passed) NFTs that the contract has

    function retrieveNFTs(uint256 pageNumber, uint256 pageSize, bool isAvailable) external view returns(string memory nftsResponseJSON, uint256 allAcceptableNFTsCount);

    /// @dev This is the function to set the price in ethers for an NFT token 
    /// @dev Only the owner can call this function
    /// @param id ID of NFT token for which token price needs to be updated
    /// @param newTokenEthPrice New price in ethers for the NFT token
    
    function setTokenEthPrice(uint256 id, uint256 newTokenEthPrice) external;

    /// @dev This is the function to set the price in ERC20 tokens for an NFT token 
    /// @dev Only the owner can call this function
    /// @param id ID of NFT token for which token price needs to be updated
    /// @param newTokenERC20Price New price in ERC20 tokens for the NFT token
    
    function setTokenERC20Price(uint256 id, uint256 newTokenERC20Price) external;

    /// @dev This is the function to reset the prices for an NFT token 
    /// @dev Only the owner can call this function
    /// @param id ID of NFT token for which token prices need to be updated

    function resetTokenPrices(uint256 id) external;

    /// @dev This is the function to set the ERC20 token for accepting price of NFTs 
    /// @dev Only the owner can call this function
    /// @param newSxtToken Address of the particular ERC20 token, for accepting price of NFTs in ERC20 tokens

    function setERC20Token(IERC20 newSxtToken) external;

    /// @dev This is the function to buy a new NFT token which is available free of cost
    /// @dev Only called when contract is unpaused
    /// @param id ID of NFT token to be bought
    /// @param to Address to which NFT token should be minted to

    function mintNFT(uint256 id, address to) external;

    /// @dev This is the function to buy a new NFT token using Ethers
    /// @dev Only called when contract is unpaused
    /// @dev If Token is buyable with Ether and ethPrice > 0, function will accept ethers
    /// @param id ID of NFT token to be bought
    /// @param to Address to which NFT token should be minted to

    function mintNFTUsingEth(uint256 id, address to) external payable;

    /// @dev This is the function to buy a new NFT token using ERC20 Token
    /// @dev Only called when contract is unpaused
    /// @dev If Token is buyable with ERC20 token and erc20Price > 0, function will transfer ERC20 tokens to contract
    /// @param id ID of NFT token to be bought
    /// @param to Address to which NFT token should be minted to

    function mintNFTUsingERC20(uint256 id, address to) external;

    /// @dev This is the function to add new NFT tokens in the contract
    /// @dev Only the owner can call this function
    /// @param newTokenURIs Array of URIs for NFTs to be added
    /// @param maxNewTokenSupplies Array of maximum possible supplies for NFTs to be added
    /// @param hasPrices Array of boolean flags representing whether the NFT token has any price or not
    /// @param newEthPrices Array of prices in Ethers for NFTs to be added
    /// @param newERC20Prices Array of prices in ERC20 Tokens for NFTs to be added

    function addNewNFTs(string [] memory newTokenURIs, bool [] memory hasPrices, uint256 [] memory newEthPrices, uint256 [] memory newERC20Prices, uint256 [] memory maxNewTokenSupplies) external;
    
    /// @dev This is the function to withdraw ethers from contract
    /// @dev Only the owner can call this function

    function withdrawEth() external;

    /// @dev This is the function to withdraw ERC20 Tokens from contract
    /// @dev Only the owner can call this function    

    function withdrawERC20() external;

    /// @dev This is the function to pause the contract

    function pause() external;

    /// @dev This is the function to unpause the contract

    function unpause() external;
  
}

File 3 of 17 : SxTCommunityStorage.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.7;

import "@openzeppelin/contracts/token/ERC1155/ERC1155.sol";
import "@openzeppelin/contracts/utils/Counters.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/security/ReentrancyGuard.sol";
import "@openzeppelin/contracts/security/Pausable.sol";
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/utils/Strings.sol";

contract SxTCommunityStorage {
    using Strings for uint256;

    // Constant denoting zero address
    address constant ZERO_ADDRESS = address(0);

    // Amount of tokens that can be bought at a time
    uint8 constant AMOUNT_BUYABLE = 1;

    // Name of ERC1155 token
    string public name;

    // Symbol of ERC1155 token
    string public symbol;

    // IERC20 token instance for accepting NFT token's price in ERC20 tokens
    IERC20 public sxtToken;

    // Structure of NFT token
    struct Token {
        string tokenUri;
        bool hasPrice;
        uint256 id;
        uint256 ethPrice;
        uint256 erc20Price;
        uint256 maxTokenSupply;
        uint256 currentTokenSupply;
    }

    /// @dev This function returns stringified JSON form of a struct  
    /// @param nftToken Detailed structure instance of an NFT
    /// @return nftJSONString Stringified JSON response generated from struct

    function getJSONfromStruct(Token memory nftToken) internal pure returns (string memory) {
        string memory hasPrice = nftToken.hasPrice ? "true": "false";
        string memory nftJSONString = string(abi.encodePacked(
            "{\"tokenUri\":\"",nftToken.tokenUri,
            "\",\"hasPrice\":\"",hasPrice,
            "\",\"id\":\"",nftToken.id.toString(),
            "\",\"erc20Price\":\"",nftToken.erc20Price.toString(),
            "\",\"ethPrice\":\"",nftToken.ethPrice.toString(),
            "\",\"maxTokenSupply\":\"",nftToken.maxTokenSupply.toString(),
            "\",\"currentTokenSupply\":\"",nftToken.currentTokenSupply.toString(),
            "\"}"
        ));
        return string(abi.encodePacked(
            bytes(nftJSONString)
        ));
    }  

    /// @dev This function returns stringified JSON form of an array of structs  
    /// @param nftTokens Array of structs of NFTs
    /// @return nftsJSONString Stringified JSON response generated from struct array

    function getJSONResponse(Token [] memory nftTokens) internal pure returns (string memory) {
        string memory nftsJSONString;
        for (uint256 index = 0; index < nftTokens.length; index++){
            if(keccak256(abi.encodePacked(nftTokens[index].tokenUri)) != keccak256(abi.encodePacked("")))
            {
                string memory nftJSONString = getJSONfromStruct(nftTokens[index]);
                if(index != 0 )
                    nftsJSONString = string(abi.encodePacked( nftsJSONString, ","));
                nftsJSONString = string(abi.encodePacked(nftsJSONString, nftJSONString));                
            }
            else 
            {
                break;
            }
        }
        nftsJSONString = string(abi.encodePacked("[", nftsJSONString, "]"));
        return nftsJSONString;
    }

    // Mapping for maintaining NFT token ID
    mapping(uint256 => Token) public tokenDetails;

    // Mapping for maintaing whether an address had minted a particular NFT from the contract previously
    mapping(uint256 => mapping(address => bool)) public isPreviouslyMintedFrom;
}

File 4 of 17 : IERC165.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/IERC165.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC165 standard, as defined in the
 * https://eips.ethereum.org/EIPS/eip-165[EIP].
 *
 * 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
     * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
     * 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 5 of 17 : ERC165.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/ERC165.sol)

pragma solidity ^0.8.0;

import "./IERC165.sol";

/**
 * @dev Implementation of the {IERC165} interface.
 *
 * Contracts that want to implement ERC165 should inherit from this contract and override {supportsInterface} to check
 * for the additional interface id that will be supported. For example:
 *
 * ```solidity
 * function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
 *     return interfaceId == type(MyInterface).interfaceId || super.supportsInterface(interfaceId);
 * }
 * ```
 *
 * Alternatively, {ERC165Storage} provides an easier to use but more expensive implementation.
 */
abstract contract ERC165 is IERC165 {
    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        return interfaceId == type(IERC165).interfaceId;
    }
}

File 6 of 17 : Strings.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (utils/Strings.sol)

pragma solidity ^0.8.0;

/**
 * @dev String operations.
 */
library Strings {
    bytes16 private constant _HEX_SYMBOLS = "0123456789abcdef";
    uint8 private constant _ADDRESS_LENGTH = 20;

    /**
     * @dev Converts a `uint256` to its ASCII `string` decimal representation.
     */
    function toString(uint256 value) internal pure returns (string memory) {
        // Inspired by OraclizeAPI's implementation - MIT licence
        // https://github.com/oraclize/ethereum-api/blob/b42146b063c7d6ee1358846c198246239e9360e8/oraclizeAPI_0.4.25.sol

        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);
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.
     */
    function toHexString(uint256 value) internal pure returns (string memory) {
        if (value == 0) {
            return "0x00";
        }
        uint256 temp = value;
        uint256 length = 0;
        while (temp != 0) {
            length++;
            temp >>= 8;
        }
        return toHexString(value, length);
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length.
     */
    function toHexString(uint256 value, uint256 length) internal pure returns (string memory) {
        bytes memory buffer = new bytes(2 * length + 2);
        buffer[0] = "0";
        buffer[1] = "x";
        for (uint256 i = 2 * length + 1; i > 1; --i) {
            buffer[i] = _HEX_SYMBOLS[value & 0xf];
            value >>= 4;
        }
        require(value == 0, "Strings: hex length insufficient");
        return string(buffer);
    }

    /**
     * @dev Converts an `address` with fixed length of 20 bytes to its not checksummed ASCII `string` hexadecimal representation.
     */
    function toHexString(address addr) internal pure returns (string memory) {
        return toHexString(uint256(uint160(addr)), _ADDRESS_LENGTH);
    }
}

File 7 of 17 : Counters.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Counters.sol)

pragma solidity ^0.8.0;

/**
 * @title Counters
 * @author Matt Condon (@shrugs)
 * @dev Provides counters that can only be incremented, decremented or reset. 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;`
 */
library Counters {
    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 {
        unchecked {
            counter._value += 1;
        }
    }

    function decrement(Counter storage counter) internal {
        uint256 value = counter._value;
        require(value > 0, "Counter: decrement overflow");
        unchecked {
            counter._value = value - 1;
        }
    }

    function reset(Counter storage counter) internal {
        counter._value = 0;
    }
}

File 8 of 17 : Context.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)

pragma solidity ^0.8.0;

/**
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
}

File 9 of 17 : Address.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (utils/Address.sol)

pragma solidity ^0.8.1;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     *
     * [IMPORTANT]
     * ====
     * You shouldn't rely on `isContract` to protect against flash loan attacks!
     *
     * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
     * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
     * constructor.
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize/address.code.length, which returns 0
        // for contracts in construction, since the code is only stored at the end
        // of the constructor execution.

        return account.code.length > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        (bool success, ) = recipient.call{value: amount}("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain `call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionCall(target, data, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        require(isContract(target), "Address: call to non-contract");

        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        require(isContract(target), "Address: static call to non-contract");

        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(isContract(target), "Address: delegate call to non-contract");

        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly
                /// @solidity memory-safe-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

File 10 of 17 : IERC20.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);

    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `to`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address to, uint256 amount) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `from` to `to` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(
        address from,
        address to,
        uint256 amount
    ) external returns (bool);
}

File 11 of 17 : IERC1155MetadataURI.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC1155/extensions/IERC1155MetadataURI.sol)

pragma solidity ^0.8.0;

import "../IERC1155.sol";

/**
 * @dev Interface of the optional ERC1155MetadataExtension interface, as defined
 * in the https://eips.ethereum.org/EIPS/eip-1155#metadata-extensions[EIP].
 *
 * _Available since v3.1._
 */
interface IERC1155MetadataURI is IERC1155 {
    /**
     * @dev Returns the URI for token type `id`.
     *
     * If the `\{id\}` substring is present in the URI, it must be replaced by
     * clients with the actual token type ID.
     */
    function uri(uint256 id) external view returns (string memory);
}

File 12 of 17 : IERC1155Receiver.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (token/ERC1155/IERC1155Receiver.sol)

pragma solidity ^0.8.0;

import "../../utils/introspection/IERC165.sol";

/**
 * @dev _Available since v3.1._
 */
interface IERC1155Receiver is IERC165 {
    /**
     * @dev Handles the receipt of a single ERC1155 token type. This function is
     * called at the end of a `safeTransferFrom` after the balance has been updated.
     *
     * NOTE: To accept the transfer, this must return
     * `bytes4(keccak256("onERC1155Received(address,address,uint256,uint256,bytes)"))`
     * (i.e. 0xf23a6e61, or its own function selector).
     *
     * @param operator The address which initiated the transfer (i.e. msg.sender)
     * @param from The address which previously owned the token
     * @param id The ID of the token being transferred
     * @param value The amount of tokens being transferred
     * @param data Additional data with no specified format
     * @return `bytes4(keccak256("onERC1155Received(address,address,uint256,uint256,bytes)"))` if transfer is allowed
     */
    function onERC1155Received(
        address operator,
        address from,
        uint256 id,
        uint256 value,
        bytes calldata data
    ) external returns (bytes4);

    /**
     * @dev Handles the receipt of a multiple ERC1155 token types. This function
     * is called at the end of a `safeBatchTransferFrom` after the balances have
     * been updated.
     *
     * NOTE: To accept the transfer(s), this must return
     * `bytes4(keccak256("onERC1155BatchReceived(address,address,uint256[],uint256[],bytes)"))`
     * (i.e. 0xbc197c81, or its own function selector).
     *
     * @param operator The address which initiated the batch transfer (i.e. msg.sender)
     * @param from The address which previously owned the token
     * @param ids An array containing ids of each token being transferred (order and length must match values array)
     * @param values An array containing amounts of each token being transferred (order and length must match ids array)
     * @param data Additional data with no specified format
     * @return `bytes4(keccak256("onERC1155BatchReceived(address,address,uint256[],uint256[],bytes)"))` if transfer is allowed
     */
    function onERC1155BatchReceived(
        address operator,
        address from,
        uint256[] calldata ids,
        uint256[] calldata values,
        bytes calldata data
    ) external returns (bytes4);
}

File 13 of 17 : IERC1155.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (token/ERC1155/IERC1155.sol)

pragma solidity ^0.8.0;

import "../../utils/introspection/IERC165.sol";

/**
 * @dev Required interface of an ERC1155 compliant contract, as defined in the
 * https://eips.ethereum.org/EIPS/eip-1155[EIP].
 *
 * _Available since v3.1._
 */
interface IERC1155 is IERC165 {
    /**
     * @dev Emitted when `value` tokens of token type `id` are transferred from `from` to `to` by `operator`.
     */
    event TransferSingle(address indexed operator, address indexed from, address indexed to, uint256 id, uint256 value);

    /**
     * @dev Equivalent to multiple {TransferSingle} events, where `operator`, `from` and `to` are the same for all
     * transfers.
     */
    event TransferBatch(
        address indexed operator,
        address indexed from,
        address indexed to,
        uint256[] ids,
        uint256[] values
    );

    /**
     * @dev Emitted when `account` grants or revokes permission to `operator` to transfer their tokens, according to
     * `approved`.
     */
    event ApprovalForAll(address indexed account, address indexed operator, bool approved);

    /**
     * @dev Emitted when the URI for token type `id` changes to `value`, if it is a non-programmatic URI.
     *
     * If an {URI} event was emitted for `id`, the standard
     * https://eips.ethereum.org/EIPS/eip-1155#metadata-extensions[guarantees] that `value` will equal the value
     * returned by {IERC1155MetadataURI-uri}.
     */
    event URI(string value, uint256 indexed id);

    /**
     * @dev Returns the amount of tokens of token type `id` owned by `account`.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     */
    function balanceOf(address account, uint256 id) external view returns (uint256);

    /**
     * @dev xref:ROOT:erc1155.adoc#batch-operations[Batched] version of {balanceOf}.
     *
     * Requirements:
     *
     * - `accounts` and `ids` must have the same length.
     */
    function balanceOfBatch(address[] calldata accounts, uint256[] calldata ids)
        external
        view
        returns (uint256[] memory);

    /**
     * @dev Grants or revokes permission to `operator` to transfer the caller's tokens, according to `approved`,
     *
     * Emits an {ApprovalForAll} event.
     *
     * Requirements:
     *
     * - `operator` cannot be the caller.
     */
    function setApprovalForAll(address operator, bool approved) external;

    /**
     * @dev Returns true if `operator` is approved to transfer ``account``'s tokens.
     *
     * See {setApprovalForAll}.
     */
    function isApprovedForAll(address account, address operator) external view returns (bool);

    /**
     * @dev Transfers `amount` tokens of token type `id` from `from` to `to`.
     *
     * Emits a {TransferSingle} event.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     * - If the caller is not `from`, it must have been approved to spend ``from``'s tokens via {setApprovalForAll}.
     * - `from` must have a balance of tokens of type `id` of at least `amount`.
     * - If `to` refers to a smart contract, it must implement {IERC1155Receiver-onERC1155Received} and return the
     * acceptance magic value.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 id,
        uint256 amount,
        bytes calldata data
    ) external;

    /**
     * @dev xref:ROOT:erc1155.adoc#batch-operations[Batched] version of {safeTransferFrom}.
     *
     * Emits a {TransferBatch} event.
     *
     * Requirements:
     *
     * - `ids` and `amounts` must have the same length.
     * - If `to` refers to a smart contract, it must implement {IERC1155Receiver-onERC1155BatchReceived} and return the
     * acceptance magic value.
     */
    function safeBatchTransferFrom(
        address from,
        address to,
        uint256[] calldata ids,
        uint256[] calldata amounts,
        bytes calldata data
    ) external;
}

File 14 of 17 : ERC1155.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (token/ERC1155/ERC1155.sol)

pragma solidity ^0.8.0;

import "./IERC1155.sol";
import "./IERC1155Receiver.sol";
import "./extensions/IERC1155MetadataURI.sol";
import "../../utils/Address.sol";
import "../../utils/Context.sol";
import "../../utils/introspection/ERC165.sol";

/**
 * @dev Implementation of the basic standard multi-token.
 * See https://eips.ethereum.org/EIPS/eip-1155
 * Originally based on code by Enjin: https://github.com/enjin/erc-1155
 *
 * _Available since v3.1._
 */
contract ERC1155 is Context, ERC165, IERC1155, IERC1155MetadataURI {
    using Address for address;

    // Mapping from token ID to account balances
    mapping(uint256 => mapping(address => uint256)) private _balances;

    // Mapping from account to operator approvals
    mapping(address => mapping(address => bool)) private _operatorApprovals;

    // Used as the URI for all token types by relying on ID substitution, e.g. https://token-cdn-domain/{id}.json
    string private _uri;

    /**
     * @dev See {_setURI}.
     */
    constructor(string memory uri_) {
        _setURI(uri_);
    }

    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override(ERC165, IERC165) returns (bool) {
        return
            interfaceId == type(IERC1155).interfaceId ||
            interfaceId == type(IERC1155MetadataURI).interfaceId ||
            super.supportsInterface(interfaceId);
    }

    /**
     * @dev See {IERC1155MetadataURI-uri}.
     *
     * This implementation returns the same URI for *all* token types. It relies
     * on the token type ID substitution mechanism
     * https://eips.ethereum.org/EIPS/eip-1155#metadata[defined in the EIP].
     *
     * Clients calling this function must replace the `\{id\}` substring with the
     * actual token type ID.
     */
    function uri(uint256) public view virtual override returns (string memory) {
        return _uri;
    }

    /**
     * @dev See {IERC1155-balanceOf}.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     */
    function balanceOf(address account, uint256 id) public view virtual override returns (uint256) {
        require(account != address(0), "ERC1155: address zero is not a valid owner");
        return _balances[id][account];
    }

    /**
     * @dev See {IERC1155-balanceOfBatch}.
     *
     * Requirements:
     *
     * - `accounts` and `ids` must have the same length.
     */
    function balanceOfBatch(address[] memory accounts, uint256[] memory ids)
        public
        view
        virtual
        override
        returns (uint256[] memory)
    {
        require(accounts.length == ids.length, "ERC1155: accounts and ids length mismatch");

        uint256[] memory batchBalances = new uint256[](accounts.length);

        for (uint256 i = 0; i < accounts.length; ++i) {
            batchBalances[i] = balanceOf(accounts[i], ids[i]);
        }

        return batchBalances;
    }

    /**
     * @dev See {IERC1155-setApprovalForAll}.
     */
    function setApprovalForAll(address operator, bool approved) public virtual override {
        _setApprovalForAll(_msgSender(), operator, approved);
    }

    /**
     * @dev See {IERC1155-isApprovedForAll}.
     */
    function isApprovedForAll(address account, address operator) public view virtual override returns (bool) {
        return _operatorApprovals[account][operator];
    }

    /**
     * @dev See {IERC1155-safeTransferFrom}.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 id,
        uint256 amount,
        bytes memory data
    ) public virtual override {
        require(
            from == _msgSender() || isApprovedForAll(from, _msgSender()),
            "ERC1155: caller is not token owner nor approved"
        );
        _safeTransferFrom(from, to, id, amount, data);
    }

    /**
     * @dev See {IERC1155-safeBatchTransferFrom}.
     */
    function safeBatchTransferFrom(
        address from,
        address to,
        uint256[] memory ids,
        uint256[] memory amounts,
        bytes memory data
    ) public virtual override {
        require(
            from == _msgSender() || isApprovedForAll(from, _msgSender()),
            "ERC1155: caller is not token owner nor approved"
        );
        _safeBatchTransferFrom(from, to, ids, amounts, data);
    }

    /**
     * @dev Transfers `amount` tokens of token type `id` from `from` to `to`.
     *
     * Emits a {TransferSingle} event.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     * - `from` must have a balance of tokens of type `id` of at least `amount`.
     * - If `to` refers to a smart contract, it must implement {IERC1155Receiver-onERC1155Received} and return the
     * acceptance magic value.
     */
    function _safeTransferFrom(
        address from,
        address to,
        uint256 id,
        uint256 amount,
        bytes memory data
    ) internal virtual {
        require(to != address(0), "ERC1155: transfer to the zero address");

        address operator = _msgSender();
        uint256[] memory ids = _asSingletonArray(id);
        uint256[] memory amounts = _asSingletonArray(amount);

        _beforeTokenTransfer(operator, from, to, ids, amounts, data);

        uint256 fromBalance = _balances[id][from];
        require(fromBalance >= amount, "ERC1155: insufficient balance for transfer");
        unchecked {
            _balances[id][from] = fromBalance - amount;
        }
        _balances[id][to] += amount;

        emit TransferSingle(operator, from, to, id, amount);

        _afterTokenTransfer(operator, from, to, ids, amounts, data);

        _doSafeTransferAcceptanceCheck(operator, from, to, id, amount, data);
    }

    /**
     * @dev xref:ROOT:erc1155.adoc#batch-operations[Batched] version of {_safeTransferFrom}.
     *
     * Emits a {TransferBatch} event.
     *
     * Requirements:
     *
     * - If `to` refers to a smart contract, it must implement {IERC1155Receiver-onERC1155BatchReceived} and return the
     * acceptance magic value.
     */
    function _safeBatchTransferFrom(
        address from,
        address to,
        uint256[] memory ids,
        uint256[] memory amounts,
        bytes memory data
    ) internal virtual {
        require(ids.length == amounts.length, "ERC1155: ids and amounts length mismatch");
        require(to != address(0), "ERC1155: transfer to the zero address");

        address operator = _msgSender();

        _beforeTokenTransfer(operator, from, to, ids, amounts, data);

        for (uint256 i = 0; i < ids.length; ++i) {
            uint256 id = ids[i];
            uint256 amount = amounts[i];

            uint256 fromBalance = _balances[id][from];
            require(fromBalance >= amount, "ERC1155: insufficient balance for transfer");
            unchecked {
                _balances[id][from] = fromBalance - amount;
            }
            _balances[id][to] += amount;
        }

        emit TransferBatch(operator, from, to, ids, amounts);

        _afterTokenTransfer(operator, from, to, ids, amounts, data);

        _doSafeBatchTransferAcceptanceCheck(operator, from, to, ids, amounts, data);
    }

    /**
     * @dev Sets a new URI for all token types, by relying on the token type ID
     * substitution mechanism
     * https://eips.ethereum.org/EIPS/eip-1155#metadata[defined in the EIP].
     *
     * By this mechanism, any occurrence of the `\{id\}` substring in either the
     * URI or any of the amounts in the JSON file at said URI will be replaced by
     * clients with the token type ID.
     *
     * For example, the `https://token-cdn-domain/\{id\}.json` URI would be
     * interpreted by clients as
     * `https://token-cdn-domain/000000000000000000000000000000000000000000000000000000000004cce0.json`
     * for token type ID 0x4cce0.
     *
     * See {uri}.
     *
     * Because these URIs cannot be meaningfully represented by the {URI} event,
     * this function emits no events.
     */
    function _setURI(string memory newuri) internal virtual {
        _uri = newuri;
    }

    /**
     * @dev Creates `amount` tokens of token type `id`, and assigns them to `to`.
     *
     * Emits a {TransferSingle} event.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     * - If `to` refers to a smart contract, it must implement {IERC1155Receiver-onERC1155Received} and return the
     * acceptance magic value.
     */
    function _mint(
        address to,
        uint256 id,
        uint256 amount,
        bytes memory data
    ) internal virtual {
        require(to != address(0), "ERC1155: mint to the zero address");

        address operator = _msgSender();
        uint256[] memory ids = _asSingletonArray(id);
        uint256[] memory amounts = _asSingletonArray(amount);

        _beforeTokenTransfer(operator, address(0), to, ids, amounts, data);

        _balances[id][to] += amount;
        emit TransferSingle(operator, address(0), to, id, amount);

        _afterTokenTransfer(operator, address(0), to, ids, amounts, data);

        _doSafeTransferAcceptanceCheck(operator, address(0), to, id, amount, data);
    }

    /**
     * @dev xref:ROOT:erc1155.adoc#batch-operations[Batched] version of {_mint}.
     *
     * Emits a {TransferBatch} event.
     *
     * Requirements:
     *
     * - `ids` and `amounts` must have the same length.
     * - If `to` refers to a smart contract, it must implement {IERC1155Receiver-onERC1155BatchReceived} and return the
     * acceptance magic value.
     */
    function _mintBatch(
        address to,
        uint256[] memory ids,
        uint256[] memory amounts,
        bytes memory data
    ) internal virtual {
        require(to != address(0), "ERC1155: mint to the zero address");
        require(ids.length == amounts.length, "ERC1155: ids and amounts length mismatch");

        address operator = _msgSender();

        _beforeTokenTransfer(operator, address(0), to, ids, amounts, data);

        for (uint256 i = 0; i < ids.length; i++) {
            _balances[ids[i]][to] += amounts[i];
        }

        emit TransferBatch(operator, address(0), to, ids, amounts);

        _afterTokenTransfer(operator, address(0), to, ids, amounts, data);

        _doSafeBatchTransferAcceptanceCheck(operator, address(0), to, ids, amounts, data);
    }

    /**
     * @dev Destroys `amount` tokens of token type `id` from `from`
     *
     * Emits a {TransferSingle} event.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `from` must have at least `amount` tokens of token type `id`.
     */
    function _burn(
        address from,
        uint256 id,
        uint256 amount
    ) internal virtual {
        require(from != address(0), "ERC1155: burn from the zero address");

        address operator = _msgSender();
        uint256[] memory ids = _asSingletonArray(id);
        uint256[] memory amounts = _asSingletonArray(amount);

        _beforeTokenTransfer(operator, from, address(0), ids, amounts, "");

        uint256 fromBalance = _balances[id][from];
        require(fromBalance >= amount, "ERC1155: burn amount exceeds balance");
        unchecked {
            _balances[id][from] = fromBalance - amount;
        }

        emit TransferSingle(operator, from, address(0), id, amount);

        _afterTokenTransfer(operator, from, address(0), ids, amounts, "");
    }

    /**
     * @dev xref:ROOT:erc1155.adoc#batch-operations[Batched] version of {_burn}.
     *
     * Emits a {TransferBatch} event.
     *
     * Requirements:
     *
     * - `ids` and `amounts` must have the same length.
     */
    function _burnBatch(
        address from,
        uint256[] memory ids,
        uint256[] memory amounts
    ) internal virtual {
        require(from != address(0), "ERC1155: burn from the zero address");
        require(ids.length == amounts.length, "ERC1155: ids and amounts length mismatch");

        address operator = _msgSender();

        _beforeTokenTransfer(operator, from, address(0), ids, amounts, "");

        for (uint256 i = 0; i < ids.length; i++) {
            uint256 id = ids[i];
            uint256 amount = amounts[i];

            uint256 fromBalance = _balances[id][from];
            require(fromBalance >= amount, "ERC1155: burn amount exceeds balance");
            unchecked {
                _balances[id][from] = fromBalance - amount;
            }
        }

        emit TransferBatch(operator, from, address(0), ids, amounts);

        _afterTokenTransfer(operator, from, address(0), ids, amounts, "");
    }

    /**
     * @dev Approve `operator` to operate on all of `owner` tokens
     *
     * Emits an {ApprovalForAll} event.
     */
    function _setApprovalForAll(
        address owner,
        address operator,
        bool approved
    ) internal virtual {
        require(owner != operator, "ERC1155: setting approval status for self");
        _operatorApprovals[owner][operator] = approved;
        emit ApprovalForAll(owner, operator, approved);
    }

    /**
     * @dev Hook that is called before any token transfer. This includes minting
     * and burning, as well as batched variants.
     *
     * The same hook is called on both single and batched variants. For single
     * transfers, the length of the `ids` and `amounts` arrays will be 1.
     *
     * Calling conditions (for each `id` and `amount` pair):
     *
     * - When `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * of token type `id` will be  transferred to `to`.
     * - When `from` is zero, `amount` tokens of token type `id` will be minted
     * for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens of token type `id`
     * will be burned.
     * - `from` and `to` are never both zero.
     * - `ids` and `amounts` have the same, non-zero length.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(
        address operator,
        address from,
        address to,
        uint256[] memory ids,
        uint256[] memory amounts,
        bytes memory data
    ) internal virtual {}

    /**
     * @dev Hook that is called after any token transfer. This includes minting
     * and burning, as well as batched variants.
     *
     * The same hook is called on both single and batched variants. For single
     * transfers, the length of the `id` and `amount` arrays will be 1.
     *
     * Calling conditions (for each `id` and `amount` pair):
     *
     * - When `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * of token type `id` will be  transferred to `to`.
     * - When `from` is zero, `amount` tokens of token type `id` will be minted
     * for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens of token type `id`
     * will be burned.
     * - `from` and `to` are never both zero.
     * - `ids` and `amounts` have the same, non-zero length.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _afterTokenTransfer(
        address operator,
        address from,
        address to,
        uint256[] memory ids,
        uint256[] memory amounts,
        bytes memory data
    ) internal virtual {}

    function _doSafeTransferAcceptanceCheck(
        address operator,
        address from,
        address to,
        uint256 id,
        uint256 amount,
        bytes memory data
    ) private {
        if (to.isContract()) {
            try IERC1155Receiver(to).onERC1155Received(operator, from, id, amount, data) returns (bytes4 response) {
                if (response != IERC1155Receiver.onERC1155Received.selector) {
                    revert("ERC1155: ERC1155Receiver rejected tokens");
                }
            } catch Error(string memory reason) {
                revert(reason);
            } catch {
                revert("ERC1155: transfer to non ERC1155Receiver implementer");
            }
        }
    }

    function _doSafeBatchTransferAcceptanceCheck(
        address operator,
        address from,
        address to,
        uint256[] memory ids,
        uint256[] memory amounts,
        bytes memory data
    ) private {
        if (to.isContract()) {
            try IERC1155Receiver(to).onERC1155BatchReceived(operator, from, ids, amounts, data) returns (
                bytes4 response
            ) {
                if (response != IERC1155Receiver.onERC1155BatchReceived.selector) {
                    revert("ERC1155: ERC1155Receiver rejected tokens");
                }
            } catch Error(string memory reason) {
                revert(reason);
            } catch {
                revert("ERC1155: transfer to non ERC1155Receiver implementer");
            }
        }
    }

    function _asSingletonArray(uint256 element) private pure returns (uint256[] memory) {
        uint256[] memory array = new uint256[](1);
        array[0] = element;

        return array;
    }
}

File 15 of 17 : ReentrancyGuard.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (security/ReentrancyGuard.sol)

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;
    }
}

File 16 of 17 : Pausable.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (security/Pausable.sol)

pragma solidity ^0.8.0;

import "../utils/Context.sol";

/**
 * @dev Contract module which allows children to implement an emergency stop
 * mechanism that can be triggered by an authorized account.
 *
 * This module is used through inheritance. It will make available the
 * modifiers `whenNotPaused` and `whenPaused`, which can be applied to
 * the functions of your contract. Note that they will not be pausable by
 * simply including this module, only once the modifiers are put in place.
 */
abstract contract Pausable is Context {
    /**
     * @dev Emitted when the pause is triggered by `account`.
     */
    event Paused(address account);

    /**
     * @dev Emitted when the pause is lifted by `account`.
     */
    event Unpaused(address account);

    bool private _paused;

    /**
     * @dev Initializes the contract in unpaused state.
     */
    constructor() {
        _paused = false;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is not paused.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    modifier whenNotPaused() {
        _requireNotPaused();
        _;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is paused.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    modifier whenPaused() {
        _requirePaused();
        _;
    }

    /**
     * @dev Returns true if the contract is paused, and false otherwise.
     */
    function paused() public view virtual returns (bool) {
        return _paused;
    }

    /**
     * @dev Throws if the contract is paused.
     */
    function _requireNotPaused() internal view virtual {
        require(!paused(), "Pausable: paused");
    }

    /**
     * @dev Throws if the contract is not paused.
     */
    function _requirePaused() internal view virtual {
        require(paused(), "Pausable: not paused");
    }

    /**
     * @dev Triggers stopped state.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    function _pause() internal virtual whenNotPaused {
        _paused = true;
        emit Paused(_msgSender());
    }

    /**
     * @dev Returns to normal state.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    function _unpause() internal virtual whenPaused {
        _paused = false;
        emit Unpaused(_msgSender());
    }
}

File 17 of 17 : Ownable.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (access/Ownable.sol)

pragma solidity ^0.8.0;

import "../utils/Context.sol";

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;

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

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor() {
        _transferOwnership(_msgSender());
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        _checkOwner();
        _;
    }

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

    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal view virtual {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        _transferOwnership(address(0));
    }

    /**
     * @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);
    }
}

Settings
{
  "remappings": [],
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "evmVersion": "london",
  "libraries": {},
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  }
}

Contract Security Audit

Contract ABI

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IERC20","name":"sXtToken","type":"address"}],"name":"Erc20TokenSet","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"},{"indexed":false,"internalType":"address","name":"to","type":"address"}],"name":"Erc20TokenWithdrawn","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"},{"indexed":false,"internalType":"address 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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)

00000000000000000000000000000000000000000000000000000000000000400000000000000000000000000000000000000000000000000000000000000080000000000000000000000000000000000000000000000000000000000000000f537854436f6d6d756e6974794e4654000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000045378544300000000000000000000000000000000000000000000000000000000

-----Decoded View---------------
Arg [0] : tokenName (string): SxTCommunityNFT
Arg [1] : tokenSymbol (string): SxTC

-----Encoded View---------------
6 Constructor Arguments found :
Arg [0] : 0000000000000000000000000000000000000000000000000000000000000040
Arg [1] : 0000000000000000000000000000000000000000000000000000000000000080
Arg [2] : 000000000000000000000000000000000000000000000000000000000000000f
Arg [3] : 537854436f6d6d756e6974794e46540000000000000000000000000000000000
Arg [4] : 0000000000000000000000000000000000000000000000000000000000000004
Arg [5] : 5378544300000000000000000000000000000000000000000000000000000000


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