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contracts...WEARKey.sol

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "https://github.com/OpenZeppelin/openzeppelin-contracts/blob/v4.4.2/contracts/access/Ownable.sol";
import "https://github.com/OpenZeppelin/openzeppelin-contracts/blob/v4.4.2/contracts/token/ERC721/extensions/ERC721URIStorage.sol";
import "https://github.com/OpenZeppelin/openzeppelin-contracts/blob/v4.4.2/contracts/token/ERC721/extensions/ERC721Enumerable.sol";
import "https://github.com/OpenZeppelin/openzeppelin-contracts/blob/v4.4.2/contracts/token/ERC721/extensions/ERC721Burnable.sol";
import "https://github.com/OpenZeppelin/openzeppelin-contracts/blob/v4.4.2/contracts/utils/Counters.sol";

contract WEARKey is ERC721URIStorage, ERC721Burnable, ERC721Enumerable, Ownable {
    using Counters for Counters.Counter;
    Counters.Counter private _tokenIdCounter;

    constructor() ERC721("WEARKey", "WEARKEY") {}

    function _baseURI() internal pure override returns (string memory) {
        return "";
    }

    function safeMint(address to, string memory uri) public onlyOwner {
        uint256 tokenId = _tokenIdCounter.current();
        _tokenIdCounter.increment();
        _safeMint(to, tokenId);
        _setTokenURI(tokenId, uri);
    }

    function batchMint(address to, uint256 number, string memory uri) public onlyOwner {
        for(uint i=0; i < number; i++) {
            safeMint(to, uri);
        }
    }

    // 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 _burn(uint256 tokenId) internal override(ERC721, ERC721URIStorage) {
        super._burn(tokenId);
    }

    function tokenURI(uint256 tokenId) public view override(ERC721, ERC721URIStorage) returns (string memory) {
        return super.tokenURI(tokenId);
    }

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