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contracts...CyberStellar.sol

// SPDX-License-Identifier: MIT

/*
CyberStellar - Smart Contract with burn functionality.
Author: Faizan
*/
pragma solidity ^0.8.2;

import "@openzeppelin/contracts@4.4.2/token/ERC721/ERC721.sol";
import "@openzeppelin/contracts@4.4.2/token/ERC721/extensions/ERC721Enumerable.sol";
import "@openzeppelin/contracts@4.4.2/token/ERC721/extensions/ERC721Burnable.sol";
import "@openzeppelin/contracts@4.4.2/access/Ownable.sol";


contract CyberStellar is ERC721, ERC721Enumerable, ERC721Burnable, Ownable {


    using Strings for uint256;
    string public baseExtension = ".json";
    uint256 public cost = 0.01 ether;
    uint256 public maxSupply = 5;
    uint256 public maxMintAmount = 2;
    uint256 public nftPerAddressLimit = 4;
    bool public paused = false;
    bool public onlyWhitelisted = true;
    address[] public whitelistedAddresses;



    constructor(
    string memory _name,
    string memory _symbol

    ) ERC721(_name, _symbol) {
    }

    function _baseURI() internal pure override returns (string memory) {
            return "ipfs://QmVrsvEWgL4gndMQWohcSKszqB8ACrZapKYou886KXj8y8/";
        }

    function mint( uint256 _mintAmount) public payable {
    require(!paused);
    uint256 supply = totalSupply();
    require(_mintAmount > 0);
    require(_mintAmount <= maxMintAmount);
    require(supply + _mintAmount <= maxSupply);

    if (msg.sender != owner()) {
          if(onlyWhitelisted == true) {
              require(isWhitelisted(msg.sender), "User not Whitelisted");
              uint256 ownerTokenCount = balanceOf(msg.sender);
              require(ownerTokenCount < nftPerAddressLimit);
          }
          require(msg.value >= cost * _mintAmount);
    }

    for (uint256 i = 1; i <= _mintAmount; i++) {
      _safeMint(msg.sender, supply + i);
    }
  }

  function isWhitelisted(address _user) public view returns (bool){
    for(uint256 i=0; i< whitelistedAddresses.length;i++){
      if(whitelistedAddresses[i] == _user){
          return true;
      }
    }
    return false;
  }


  function walletOfOwner(address _owner)
    public
    view
    returns (uint256[] memory)
  {
    uint256 ownerTokenCount = balanceOf(_owner);
    uint256[] memory tokenIds = new uint256[](ownerTokenCount);
    for (uint256 i; i < ownerTokenCount; i++) {
      tokenIds[i] = tokenOfOwnerByIndex(_owner, i);
    }
    return tokenIds;
  }

  function tokenURI(uint256 tokenId)
    public
    view
    virtual
    override
    returns (string memory)
  {
    require(
      _exists(tokenId),
      "ERC721Metadata: URI query for nonexistent token"
    );
  
    string memory currentBaseURI = _baseURI();
    return bytes(currentBaseURI).length > 0
        ? string(abi.encodePacked(currentBaseURI, tokenId.toString(), baseExtension))
        : "";
  }

  //only owner

  function setNftPerAddressLimit(uint256 _limit) public onlyOwner {
    nftPerAddressLimit = _limit;
  }


  function setCost(uint256 _newCost) public onlyOwner {
    cost = _newCost;
  }

  function setmaxMintAmount(uint256 _newmaxMintAmount) public onlyOwner {
    maxMintAmount = _newmaxMintAmount;
  }

  function setBaseExtension(string memory _newBaseExtension) public onlyOwner {
    baseExtension = _newBaseExtension;
  }

  function pause(bool _state) public onlyOwner {
    paused = _state;
  }

  function setOnlyWhitelisted(bool _state) public onlyOwner {
    onlyWhitelisted = _state;
  }
 
 function whitelistUsers(address[] calldata _users) public onlyOwner {
    delete whitelistedAddresses;
    whitelistedAddresses = _users;
  }


  function withdraw() public payable onlyOwner {
    
    // =============================================================================
    (bool os, ) = payable(owner()).call{value: address(this).balance}("");
    require(os);
    // =============================================================================
  }

    // The following functions are overrides required by Solidity.

    function _beforeTokenTransfer(address from, address to, uint256 tokenId)
        internal
        override(ERC721, ERC721Enumerable)
    {
        super._beforeTokenTransfer(from, to, tokenId);
    }

    function supportsInterface(bytes4 interfaceId)
        public
        view
        override(ERC721, ERC721Enumerable)
        returns (bool)
    {
        return super.supportsInterface(interfaceId);
    }
}