juice-shop

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pragma solidity ^0.8.4;
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import "@openzeppelin/contracts/token/ERC721/ERC721.sol";
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import "@openzeppelin/contracts/token/ERC721/extensions/ERC721URIStorage.sol";
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import "@openzeppelin/contracts/access/Ownable.sol";
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import "@openzeppelin/contracts/utils/Counters.sol";
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contract JuiceShopSBT is ERC721, ERC721URIStorage, Ownable {
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    using Counters for Counters.Counter;
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    Counters.Counter private _tokenIdCounter;
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    constructor() ERC721("JuiceShopSBT", "JS") {}
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    function safeMint(address to, string memory uri) public onlyOwner {
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        uint256 tokenId = _tokenIdCounter.current();
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        _tokenIdCounter.increment();
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        _safeMint(to, tokenId);
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        _setTokenURI(tokenId, uri);
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    }
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    function _beforeTokenTransfer(
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    address from,
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    address to,
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    uint256 tokenId
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    ) internal override virtual {
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    require(from == address(0), "Err: token transfer is BLOCKED");
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    super._beforeTokenTransfer(from, to, tokenId);
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    }
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    function _burn(uint256 tokenId) internal override(ERC721, ERC721URIStorage) {
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        super._burn(tokenId);
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    }
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    function tokenURI(uint256 tokenId)
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        public
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        view
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        override(ERC721, ERC721URIStorage)
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        returns (string memory)
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    {
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        return super.tokenURI(tokenId);
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    }
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}