A boilerplater ERC721 and an ERC998 Top Down composable and enumerabl…

…e NFT.

ERC998 for Solidity ^0.8.2:
info here:  ethereum/EIPs#998

Most of the functionality is there.

feel free to use.

ERC721.sol

@@ -0,0 +1,80 @@
+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.2;
+
+import "@openzeppelin/contracts/token/ERC721/ERC721.sol";
+import "@openzeppelin/contracts/token/ERC721/extensions/ERC721Enumerable.sol";
+import "@openzeppelin/contracts/security/Pausable.sol";
+import "@openzeppelin/contracts/access/Ownable.sol";
+import "@openzeppelin/contracts/token/ERC721/extensions/ERC721Burnable.sol";
+import "@openzeppelin/contracts/utils/Counters.sol";
+import "@openzeppelin/contracts/token/ERC721/extensions/IERC721Metadata.sol";
+import "@openzeppelin/contracts/token/ERC721/extensions/ERC721URIStorage.sol";
+
+contract Capture12 is ERC721, ERC721Enumerable, ERC721URIStorage, Pausable, Ownable, ERC721Burnable {
+    using Counters for Counters.Counter;
+
+    Counters.Counter private _tokenIdCounter;
+
+    constructor() ERC721("ERC721", "NFT") {}
+
+    event NFTMinted(uint indexed tokenId, address indexed to);
+    function pause() public onlyOwner {
+        _pause();
+    }
+
+    function unpause() public onlyOwner {
+        _unpause();
+    }
+
+    function safeMint(address to, string calldata _ipfsUri) public returns(uint){
+
+        uint256 tokenId = _tokenIdCounter.current();
+        // require(_ipfsURI == whitelisted, "we should add some logic to whitelist this or something maybe?");
+        _safeMint(to, tokenId);
+        _setTokenURI(tokenId, _ipfsUri);
+        _tokenIdCounter.increment();
+
+        emit NFTMinted(tokenId, address(to));
+
+        return tokenId;
+    }
+
+    function _beforeTokenTransfer(address from, address to, uint256 tokenId)
+        internal
+        whenNotPaused
+        override(ERC721, ERC721Enumerable)
+    {
+        super._beforeTokenTransfer(from, to, tokenId);
+    }
+
+    // The following functions are overrides required by Solidity.
+
+    function _burn(uint256 tokenId) internal override(ERC721, ERC721URIStorage) {
+        super._burn(tokenId);
+    }
+
+    // function addToPortfolio() {
+    //     uint256 tokenId = 6;
+    //     bytes memory tokenIdBytes = new bytes(32);
+    //     assembly { mstore(add(tokenIdBytes, 32), tokenId) }
+    //     safeTransferFrom(msg.sender, address(), 3, tokenIdBytes);
+    // }
+
+    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);
+    }
+}