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Add Dynamic NFT example (#15)
* add dynamic NFT example
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‎dynamic-nft/1_starter.sol

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// SPDX-License-Identifier: MIT
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pragma solidity ^0.8.4;
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import "@openzeppelin/[email protected]/token/ERC721/ERC721.sol";
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import "@openzeppelin/[email protected]/token/ERC721/extensions/ERC721URIStorage.sol";
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import "@openzeppelin/[email protected]/access/Ownable.sol";
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import "@openzeppelin/[email protected]/utils/Counters.sol";
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contract dynNFT 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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// Metadata information for each stage of the NFT on IPFS.
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string[] IpfsUri = [
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"https://ipfs.io/ipfs/QmYaTsyxTDnrG4toc8721w62rL4ZBKXQTGj9c9Rpdrntou/seed.json",
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"https://ipfs.io/ipfs/QmYaTsyxTDnrG4toc8721w62rL4ZBKXQTGj9c9Rpdrntou/purple-sprout.json",
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"https://ipfs.io/ipfs/QmYaTsyxTDnrG4toc8721w62rL4ZBKXQTGj9c9Rpdrntou/purple-blooms.json"
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];
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constructor() ERC721("dNFTs", "dNFT") {}
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function safeMint(address to) 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, IpfsUri[0]);
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}
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function growFlower(uint256 _tokenId) public {
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if (flowerStage(_tokenId) >= 2) {
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return;
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}
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// Get the current stage of the flower and add 1
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uint256 newVal = flowerStage(_tokenId) + 1;
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// store the new URI
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string memory newUri = IpfsUri[newVal];
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// Update the URI
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_setTokenURI(_tokenId, newUri);
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}
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// determine the stage of the flower growth
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function flowerStage(uint256 _tokenId) public view returns (uint256) {
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string memory _uri = tokenURI(_tokenId);
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// Seed
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if (compareStrings(_uri, IpfsUri[0])) {
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return 0;
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}
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// Sprout
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if (compareStrings(_uri, IpfsUri[1])) {
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return 1;
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}
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// Must be a Bloom
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return 2;
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}
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/*
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********************
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* HELPER FUNCTIONS *
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********************
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*/
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// helper function to compare strings
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function compareStrings(string memory a, string memory b)
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public
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pure
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returns (bool)
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{
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return (keccak256(abi.encodePacked((a))) ==
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keccak256(abi.encodePacked((b))));
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}
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// The following functions are overrides required by Solidity.
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function _burn(uint256 tokenId)
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internal
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override(ERC721, ERC721URIStorage)
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{
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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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}

‎dynamic-nft/2_complete.sol

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// SPDX-License-Identifier: MIT
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pragma solidity ^0.8.4;
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import "@openzeppelin/[email protected]/token/ERC721/ERC721.sol";
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import "@openzeppelin/[email protected]/token/ERC721/extensions/ERC721URIStorage.sol";
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import "@openzeppelin/[email protected]/access/Ownable.sol";
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import "@openzeppelin/[email protected]/utils/Counters.sol";
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contract dynNFT 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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// Metadata information for each stage of the NFT on IPFS.
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string[] IpfsUri = [
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"https://ipfs.io/ipfs/QmYaTsyxTDnrG4toc8721w62rL4ZBKXQTGj9c9Rpdrntou/seed.json",
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"https://ipfs.io/ipfs/QmYaTsyxTDnrG4toc8721w62rL4ZBKXQTGj9c9Rpdrntou/purple-sprout.json",
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"https://ipfs.io/ipfs/QmYaTsyxTDnrG4toc8721w62rL4ZBKXQTGj9c9Rpdrntou/purple-blooms.json"
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];
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uint256 lastTimeStamp;
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uint256 interval;
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constructor(uint256 _interval) ERC721("dNFTs", "dNFT") {
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interval = _interval;
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lastTimeStamp = block.timestamp;
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}
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function checkUpkeep(
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bytes calldata /* checkData */
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)
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external
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view
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returns (
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bool upkeepNeeded,
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bytes memory /* performData */
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)
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{
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upkeepNeeded = (block.timestamp - lastTimeStamp) > interval;
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// We don't use the checkData in this example. The checkData is defined when the Upkeep was registered.
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}
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function performUpkeep(
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bytes calldata /* performData */
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) external {
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//We highly recommend revalidating the upkeep in the performUpkeep function
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if ((block.timestamp - lastTimeStamp) > interval) {
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lastTimeStamp = block.timestamp;
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growFlower(0);
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}
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// We don't use the performData in this example. The performData is generated by the Keeper's call to your checkUpkeep function
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}
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function safeMint(address to) 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, IpfsUri[0]);
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}
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function growFlower(uint256 _tokenId) public {
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if (flowerStage(_tokenId) >= 2) {
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return;
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}
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// Get the current stage of the flower and add 1
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uint256 newVal = flowerStage(_tokenId) + 1;
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// store the new URI
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string memory newUri = IpfsUri[newVal];
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// Update the URI
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_setTokenURI(_tokenId, newUri);
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}
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// determine the stage of the flower growth
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function flowerStage(uint256 _tokenId) public view returns (uint256) {
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string memory _uri = tokenURI(_tokenId);
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// Seed
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if (compareStrings(_uri, IpfsUri[0])) {
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return 0;
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}
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// Sprout
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if (compareStrings(_uri, IpfsUri[1])) {
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return 1;
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}
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// Must be a Bloom
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return 2;
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}
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/*
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********************
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* HELPER FUNCTIONS *
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********************
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*/
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// helper function to compare strings
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function compareStrings(string memory a, string memory b)
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public
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pure
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returns (bool)
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{
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return (keccak256(abi.encodePacked((a))) ==
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keccak256(abi.encodePacked((b))));
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}
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// The following functions are overrides required by Solidity.
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function _burn(uint256 tokenId)
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internal
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override(ERC721, ERC721URIStorage)
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{
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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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}

‎dynamic-nft/README.md

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# Dynamic NFTs
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This repo will support the [Creating Dynamic NFTs](https://www.youtube.com/watch?v=E7Rm1LUKhj4) tutorial.
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## How to Use The Repo
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This repo consists of two files:
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- **1_starter.sol**: This is the starter file with the basic OpenZeppelin contract plus helper functions
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- **2_complete.sol**: the final contract for use with keepers
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Both versions of the contracts can be deployed as is via a tool like [Remix](https://remix.ethereum.org/).

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