Buildspace - Ethereum NFT - Section 2 - Create Our SVG

deploy.js

const main = async () => {
    const nftContractFactory = await hre.ethers.getContractFactory('MyEpicNFT');
    const nftContract = await nftContractFactory.deploy({
        value: hre.ethers.utils.parseEther('0.001'),
    });
    await nftContract.deployed();
    console.log("Contract deployed to:", nftContract.address);
 
    // modify at will at: https://www.svgviewer.dev/ and replace this
    const svg = `
    <svg xmlns="http://www.w3.org/2000/svg" preserveAspectRatio="xMinYMin meet" viewBox="0 0 350 350">
    <style>.base { fill: cyan; font-family: serif; font-size: 14px; }</style>
    <rect width="100%" height="100%" fill="yellow" />
    <text x="50%" y="50%" class="base" dominant-baseline="middle" text-anchor="middle">Zombie Coconut</text>
    </svg>
    `

    // modify at will
    var metadata = {
      'name': 'Zombie Coconut',
      'description': 'Rotten Coconut',
    };

    const tokenURI = encodeTokenURI(svg, metadata);
    
    // Call the function.
    let txn = await nftContract.makeAnEpicNFT(tokenURI);
    // Wait for it to be mined.
    await txn.wait()
    console.log("Minted NFT #1")
  
    // txn = await nftContract.makeAnEpicNFT()
    // // Wait for it to be mined.
    // await txn.wait()
    // console.log("Minted NFT #2")
  };

  const encodeTokenURI = (svg, metadata) => {
    const base64svg = Buffer.from(svg).toString('base64');
    metadata['image'] = 'data:image/svg+xml;base64,' + base64svg;
    const base64json = Buffer.from(JSON.stringify(metadata)).toString('base64');

    return tokenURI = 'data:application/json;base64,' + base64json;
  }
  
  const runMain = async () => {
    try {
      await main();
      process.exit(0);
    } catch (error) {
      console.log(error);
      process.exit(1);
    }
  };
  
  runMain();

MyEpicNFT.sol

pragma solidity ^0.8.0;

// We first import some OpenZeppelin Contracts.
import "@openzeppelin/contracts/token/ERC721/extensions/ERC721URIStorage.sol";
import "@openzeppelin/contracts/utils/Counters.sol";
import "hardhat/console.sol";

// We inherit the contract we imported. This means we'll have access
// to the inherited contract's methods.
contract MyEpicNFT is ERC721URIStorage {
  // Magic given to us by OpenZeppelin to help us keep track of tokenIds.
  using Counters for Counters.Counter;
  Counters.Counter private _tokenIds;

  // We need to pass the name of our NFTs token and it's symbol.
  constructor() payable ERC721 ("SquareNFT", "SQUARE") {
    console.log("This is my NFT contract. Woah!");
  }

  // A function our user will hit to get their NFT.
  function makeAnEpicNFT(string memory tokenURI) public {
     // Get the current tokenId, this starts at 0.
    uint256 newItemId = _tokenIds.current();

     // Actually mint the NFT to the sender using msg.sender.
    _safeMint(msg.sender, newItemId);

    // Set the NFTs data.
    _setTokenURI(newItemId, tokenURI);

    // Increment the counter for when the next NFT is minted.
    _tokenIds.increment();
  }
}