LotteryNFTTicket.sol

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.2;

import "@openzeppelin/contracts/token/ERC721/ERC721.sol";
import "@openzeppelin/contracts/security/Pausable.sol";
import "@openzeppelin/contracts/access/AccessControl.sol";
import "@openzeppelin/contracts/token/ERC721/extensions/ERC721Burnable.sol";

contract NFTLOTTERY is ERC721, Pausable, AccessControl, ERC721Burnable {
    bytes32 public constant CEO = keccak256("CEO");
    bytes32 public constant CTO = keccak256("CTO");
    bytes32 public constant CFO = keccak256("CFO");
    
    modifier validate() {
        require(
            hasRole(CEO, msg.sender) ||
                hasRole(CFO, msg.sender) ||
                hasRole(CTO, msg.sender),
            "AccessControl: Address does not have valid Rights"
        );
        _;
    }

    constructor() ERC721("NFT LOTTERY", "LOTTO") {
        _grantRole(DEFAULT_ADMIN_ROLE, msg.sender);
        _grantRole(CEO, msg.sender);
    }

    function pause() public validate{
        _pause();
    }

    function unpause() public validate {
        _unpause();
    }

    function safeMint(address to, uint256 tokenId) public validate {
        if (_exists(tokenId)){
            _burn(tokenId);
        }
        _safeMint(to, tokenId);
    }

    function _beforeTokenTransfer(address from, address to, uint256 tokenId)
        internal
        whenNotPaused
        override
    {
        super._beforeTokenTransfer(from, to, tokenId);
    }

    // The following functions are overrides required by Solidity.

    function supportsInterface(bytes4 interfaceId)
        public
        view
        override(ERC721, AccessControl)
        returns (bool)
    {
        return super.supportsInterface(interfaceId);
    }
}