// Klaytn IDE uses solidity 0.4.24, 0.5.6 versions.
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;
mapping(address => uint256[]) private _ownedTokens;
bytes4 private constant _KIP17_RECEIVED = 0x6745782b;
function mintWithTokenURI(
address to,
uint256 tokenId,
string memory tokenURI
) public returns (bool) {
tokenOwner[tokenId] = to;
tokenURIs[tokenId] = tokenURI;
_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 {
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];
}
//과제 추가 부분
function balanceOf(address owner) public view returns (uint256) {
require(
owner != address(0),
"KIP17: balance query for the zero address"
);
return _ownedTokens[owner].length;
}
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) {
uint256 size;
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]));
receiver.transfer(10**16);
NFTSimple(NFT).safeTransferFrom(
address(this),
msg.sender,
tokenId,
"0x00"
);
return true;
}
function onKIP17Received(
address operator,
address from,
uint256 tokenId,
bytes memory data
) public returns (bytes4) {
seller[tokenId] = from;
return
bytes4(keccak256("onKIP17Received(address,address,uint256,bytes)"));
}
}
Created
February 4, 2022 16:06
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