yan

EIPS/eip-5334.md

@@ -1,7 +1,7 @@
 ---
 eip: 5334
-title: 721 User And Expires And Level Extension
-description: Add a time-limited role with restricted permissions to [EIP-721] tokens.
+title: [`ERC-721`] User And Expires And Level Extension
+description: Add a time-limited role with restricted permissions to [`ERC-721`] tokens.
 author: Yan (@yan253319066)
 discussions-to: https://ethereum-magicians.org/t/erc-721-user-and-expires-and-level-extension/10097
 status: Draft
@@ -101,92 +101,8 @@ As mentioned in the specifications section, this standard can be fully EIP-721 c
 In addition, new functions introduced in this standard have many similarities with the existing functions in EIP-721. This allows developers to easily adopt the standard quickly.
 
 ## Reference Implementation
-[`ERC5334`] Implementation: [`ERC5334.sol`](../assets/eip-5334/ERC5334.sol)
-```solidity
-// 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);
-        }
-    }
-} 
-```
+A reference implementation of this standard can be found in the assets folder.
+<!-- [../assets/EIP-5334/ERC5334.sol](../assets/EIP-5334/ERC5334.sol). -->
 
 ## Security Considerations