Created
May 24, 2021 02:02
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| pragma solidity >=0.4.24 <=0.5.6; | |
| contract IKIP17Receiver { | |
| function onKIP17Received( | |
| address operator, | |
| address from, | |
| uint256 tokenId, | |
| bytes memory data | |
| ) public returns (bytes4); | |
| } | |
| contract NFTSimple { | |
| string public name = "KlayLion"; | |
| string public symbol = "KL"; | |
| mapping(uint256 => address) public tokenOwner; | |
| mapping(uint256 => string) public tokenURIs; | |
| // 소유한 토큰 리스트 | |
| mapping(address => uint256[]) private _ownedTokens; | |
| bytes4 private constant _KIP17_RECEIVED = 0x6745782b; | |
| // mint(tokenId, uri, owner) | |
| // transferFrom(from, to, tokenId) -> owner가 바뀌는 것(from -> to) | |
| function mintWithTokenURI( | |
| address to, | |
| uint256 tokenId, | |
| string memory tokenURI | |
| ) public returns (bool) { | |
| // to에게 tokenId(일련번호)를 발행하겠다. | |
| // 적힐 글자는 tokenURI | |
| tokenOwner[tokenId] = to; | |
| tokenURIs[tokenId] = tokenURI; | |
| // add token to the list | |
| _ownedTokens[to].push(tokenId); | |
| return true; | |
| } | |
| function safeTransferFrom( | |
| address from, | |
| address to, | |
| uint256 tokenId, | |
| bytes memory _data | |
| ) public { | |
| require(from == msg.sender, "from != msg.sender"); | |
| require( | |
| from == tokenOwner[tokenId], | |
| "you are not the owner of the token" | |
| ); | |
| // | |
| _removeTokenFromList(from, tokenId); | |
| _ownedTokens[to].push(tokenId); | |
| // | |
| tokenOwner[tokenId] = to; | |
| // | |
| require( | |
| _checkOnKIP17Received(from, to, tokenId, _data), | |
| "KIP17: transfer to non KIP17Receiver implementer" | |
| ); | |
| } | |
| function _removeTokenFromList(address from, uint256 tokenId) private { | |
| // [10, 15, 19, 20] -> 19번을 삭제 하고 싶어요 | |
| // [20, 15, 20, 19] | |
| // [10, 15, 20] | |
| uint256 lastTokenIdex = _ownedTokens[from].length - 1; | |
| for (uint256 i = 0; i < _ownedTokens[from].length; i++) { | |
| if (tokenId == _ownedTokens[from][i]) { | |
| // Swap last token with deleting token; | |
| _ownedTokens[from][i] = _ownedTokens[from][lastTokenIdex]; | |
| _ownedTokens[from][lastTokenIdex] = tokenId; | |
| break; | |
| } | |
| } | |
| // | |
| _ownedTokens[from].length--; | |
| } | |
| function ownedTokens(address owner) public view returns (uint256[] memory) { | |
| return _ownedTokens[owner]; | |
| } | |
| function setTokenUri(uint256 id, string memory uri) public { | |
| tokenURIs[id] = uri; | |
| } | |
| function _checkOnKIP17Received( | |
| address from, | |
| address to, | |
| uint256 tokenId, | |
| bytes memory _data | |
| ) internal returns (bool) { | |
| bool success; | |
| bytes memory returndata; | |
| if (!isContract(to)) { | |
| return true; | |
| } | |
| (success, returndata) = to.call( | |
| abi.encodeWithSelector( | |
| _KIP17_RECEIVED, | |
| msg.sender, | |
| from, | |
| tokenId, | |
| _data | |
| ) | |
| ); | |
| if ( | |
| returndata.length != 0 && | |
| abi.decode(returndata, (bytes4)) == _KIP17_RECEIVED | |
| ) { | |
| return true; | |
| } | |
| return false; | |
| } | |
| function isContract(address account) internal view returns (bool) { | |
| // This method relies in extcodesize, which returns 0 for contracts in | |
| // construction, since the code is only stored at the end of the | |
| // constructor execution. | |
| uint256 size; | |
| // solhint-disable-next-line no-inline-assembly | |
| assembly { | |
| size := extcodesize(account) | |
| } | |
| return size > 0; | |
| } | |
| } | |
| contract NFTMarket { | |
| mapping(uint256 => address) public seller; | |
| function buyNFT(uint256 tokenId, address NFT) | |
| public | |
| payable | |
| returns (bool) | |
| { | |
| address payable receiver = address(uint160(seller[tokenId])); | |
| // Send 0.01 klay to Seller | |
| receiver.transfer(10**16); | |
| // Send NFT if properly send klay | |
| NFTSimple(NFT).safeTransferFrom( | |
| address(this), | |
| msg.sender, | |
| tokenId, | |
| "0x00" | |
| ); | |
| return true; | |
| } | |
| // Called when SafeTransferFrom called from NFT Contract | |
| function onKIP17Received( | |
| address operator, | |
| address from, | |
| uint256 tokenId, | |
| bytes memory data | |
| ) public returns (bytes4) { | |
| // Set token seller, who was a token owner | |
| seller[tokenId] = from; | |
| // return signature which means this contract implemented interface for ERC721 | |
| return | |
| bytes4(keccak256("onKIP17Received(address,address,uint256,bytes)")); | |
| } | |
| } | |
| //아직 클레이튼에 대해 차근히 학습이 더 필요한 것 같아서 클론내용 제출하였습니다! |
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