SvgnftContract.sol

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.8;

import "@openzeppelin/contracts/token/ERC721/ERC721.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "@chainlink/contracts/src/v0.8/interfaces/AggregatorV3Interface.sol";
import "base64-sol/base64.sol";
import "hardhat/console.sol";

error ERC721Metadata__URI_QueryFor_NonExistentToken();

contract SvgNft is ERC721, Ownable {
    uint256 private s_tokenCounter;
    string private s_ImageURI;

    mapping(uint256 => int256) private s_tokenIdToHighValues;
    event CreatedNFT(uint256 indexed tokenId);

    constructor(string memory Svg) ERC721("Dynamic SVG NFT", "DSN") {
        s_tokenCounter = 0;
        s_ImageURI = svgToImageURI(Svg);
    }

    function safeMintNFT() public {
        _safeMint(msg.sender, s_tokenCounter);
        s_tokenCounter = s_tokenCounter + 1;
        emit CreatedNFT(s_tokenCounter, highValue);
    }

    // You could also just upload the raw SVG and have solildity convert it!
    function svgToImageURI(
        string memory svg
    ) public pure returns (string memory) {
        // example:
        // '<svg width="500" height="500" viewBox="0 0 285 350" fill="none" xmlns="http://www.w3.org/2000/svg"><path fill="black" d="M150,0,L75,200,L225,200,Z"></path></svg>'
        // would return ""
        string memory baseURL = "data:image/svg+xml;base64,";
        string memory svgBase64Encoded = Base64.encode(
            bytes(string(abi.encodePacked(svg)))
        );
        return string(abi.encodePacked(baseURL, svgBase64Encoded));
    }

    function _baseURI() internal pure override returns (string memory) {
        return "data:application/json;base64,";
    }

    function tokenURI(
        uint256 tokenId
    ) public view virtual override returns (string memory) {
        if (!_exists(tokenId)) {
            revert ERC721Metadata__URI_QueryFor_NonExistentToken();
        }

        string memory imageURI = s_ImageURI;

        return
            string(
                abi.encodePacked(
                    _baseURI(),
                    Base64.encode(
                        bytes(
                            abi.encodePacked(
                                '{"name":"',
                                name(), // You can add whatever name here
                                '", "description":"An NFT that changes based on the Chainlink Feed", ',
                                '"attributes": [{"trait_type": "coolness", "value": 100}], "image":"',
                                imageURI,
                                '"}'
                            )
                        )
                    )
                )
            );
    }

    function getSVG() public view returns (string memory) {
        return s_ImageURI;
    }

    function getTokenCounter() public view returns (uint256) {
        return s_tokenCounter;
    }
}