DCIPs/assets/eip-5334/ERC5334.sol

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// SPDX-License-Identifier: CC0-1.0
pragma solidity ^0.8.0;
import "@openzeppelin/contracts/token/ERC721/ERC721.sol";
import "./IERC5334.sol";
contract ERC5334 is ERC721, IERC5334 {
struct UserInfo
{
address user; // address of user role
uint64 expires; // unix timestamp, user expires
uint8 level; // user level
}
mapping (uint256 => UserInfo) internal _users;
constructor(string memory name_, string memory symbol_)
ERC721(name_,symbol_)
{
}
/// @notice set the user and expires and level of a NFT
/// @dev The zero address indicates there is no user
/// Throws if `tokenId` is not valid NFT
/// @param user The new user of the NFT
/// @param expires UNIX timestamp, The new user could use the NFT before expires
/// @param level user level
function setUser(uint256 tokenId, address user, uint64 expires, uint8 level) public virtual{
require(_isApprovedOrOwner(msg.sender, tokenId),"ERC721: transfer caller is not owner nor approved");
UserInfo storage info = _users[tokenId];
info.user = user;
info.expires = expires;
info.level = level
emit UpdateUser(tokenId,user,expires,level);
}
/// @notice Get the user address of an NFT
/// @dev The zero address indicates that there is no user or the user is expired
/// @param tokenId The NFT to get the user address for
/// @return The user address for this NFT
function userOf(uint256 tokenId)public view virtual returns(address){
if( uint256(_users[tokenId].expires) >= block.timestamp){
return _users[tokenId].user;
}
else{
return address(0);
}
}
/// @notice Get the user expires of an NFT
/// @dev The zero value indicates that there is no user
/// @param tokenId The NFT to get the user expires for
/// @return The user expires for this NFT
function userExpires(uint256 tokenId) public view virtual returns(uint256){
return _users[tokenId].expires;
}
/// @notice Get the user level of an NFT
/// @dev The zero value indicates that there is no user
/// @param tokenId The NFT to get the user level for
/// @return The user level for this NFT
function userLevel(uint256 tokenId) public view virtual returns(uint256){
return _users[tokenId].level;
}
/// @dev See {IERC165-supportsInterface}.
function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
return interfaceId == type(IERC5334).interfaceId || super.supportsInterface(interfaceId);
}
function _beforeTokenTransfer(
address from,
address to,
uint256 tokenId
) internal virtual override{
super._beforeTokenTransfer(from, to, tokenId);
if (from != to && _users[tokenId].user != address(0)) {
delete _users[tokenId];
emit UpdateUser(tokenId, address(0), 0, 0);
}
}
}