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OnRandomURIKeccak.sol
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OnRandomURIKeccak.sol
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// SPDX-License-Identifier: MIT
pragma solidity ^0.8.14;
import "@openzeppelin/contracts@4.6.0/token/ERC721/ERC721.sol";
import "@openzeppelin/contracts@4.6.0/access/Ownable.sol";
import "@openzeppelin/contracts@4.6.0/token/ERC721/extensions/ERC721URIStorage.sol";
import "@openzeppelin/contracts@4.6.0/utils/Counters.sol";
import "@openzeppelin/contracts@4.6.0/utils/Strings.sol";
import "@openzeppelin/contracts@4.6.0/utils/Base64.sol";
contract OnRandomURIKeccak is ERC721URIStorage, Ownable {
/**
* @dev
* - _tokenIdsはCountersの全関数が利用可能
*/
using Counters for Counters.Counter;
Counters.Counter private _tokenIds;
/**
* @dev
* 色の構造体を定義し、この配列変数colorsを定義
*/
struct Color {
string name;
string code;
}
Color[] public colors;
/**
* @dev
* - URI設定時に誰がどのtokenIdに何のURIを設定したか記録する
*/
event TokenURIChanged(address indexed sender, uint256 indexed tokenId, string uri);
/**
* @dev
* 配列変数colorsに色データを登録
*/
constructor() ERC721("OnRandomURIKeccak", "ONK") {
colors.push(Color("Yellow", "#ffff00"));
colors.push(Color("Whitesmoke","#f5f5f5"));
colors.push(Color("Blue","#0000ff"));
colors.push(Color("Pink","#ffc0cb"));
colors.push(Color("Green","#008000"));
colors.push(Color("Gold","#FFD700"));
colors.push(Color("Purple","#800080"));
colors.push(Color("Light Green","#90EE90"));
colors.push(Color("Orange","#FFA500"));
colors.push(Color("Gray","#808080"));
}
/**
* @dev
* - このコントラクトをデプロイしたアドレスだけがmint可能 onlyOwner
* - tokenIdをインクリメント _tokenIds.increment()
* - 画像データメタデータを設定しURIを定義 imageData, metaData,uri
* - nftMint関数実行アドレス(=デプロイアドレス)にtokenIdを紐づけ _msgSender()
* - mintの際にURIを設定 _setTokenURI()
* - EVENT発火 emit TokenURIChanged
*/
function nftMint() public onlyOwner {
_tokenIds.increment();
uint256 newTokenId = _tokenIds.current();
bytes32 hashed = keccak256(abi.encodePacked(newTokenId, block.timestamp));
Color memory color = colors[uint256(hashed)%colors.length];
string memory imageData = _getImage(color.code);
bytes memory metaData = abi.encodePacked(
'{"name": "',
'MyOnChainNFT # ',
Strings.toString(newTokenId),
'", "description": "My first on-Chain NFTs!!!",',
'"image": "data:image/svg+xml;base64,',
Base64.encode(bytes(imageData)),
'"}'
);
string memory uri = string(abi.encodePacked("data:application/json;base64,",Base64.encode(metaData)));
_mint(_msgSender(), newTokenId);
_setTokenURI(newTokenId, uri);
emit TokenURIChanged(_msgSender(), newTokenId, uri);
}
/**
* @dev
* - 引数で渡されるカラーコードを指定したSVGデータを返す
*/
function _getImage(string memory colorCode) internal pure returns (string memory) {
return (
string(
abi.encodePacked(
'<svg viewBox="0 0 350 350" xmlns="http://www.w3.org/2000/svg">',
'<polygon points="50 175, 175 50, 300 175, 175 300" stroke="green" fill="',
colorCode,
'" />',
'</svg>'
)
)
);
}
}