[ERC7507] NFTに複数のユーザーが制限付きのアクセスができる仕組みを理解しよう！

interface IERC7507 {

    /// @notice Emitted when the expires of a user for an NFT is changed
    event UpdateUser(uint256 indexed tokenId, address indexed user, uint64 expires);

    /// @notice Get the user expires of an NFT
    /// @param tokenId The NFT to get the user expires for
    /// @param user The user to get the expires for
    /// @return The user expires for this NFT
    function userExpires(uint256 tokenId, address user) external view returns(uint256);

    /// @notice Set the user expires of an NFT
    /// @param tokenId The NFT to set the user expires for
    /// @param user The user to set the expires for
    /// @param expires The user could use the NFT before expires in UNIX timestamp
    function setUser(uint256 tokenId, address user, uint64 expires) external;

}

import { loadFixture } from "@nomicfoundation/hardhat-toolbox/network-helpers";
import { expect } from "chai";
import { ethers } from "hardhat";

const NAME = "NAME";
const SYMBOL = "SYMBOL";
const TOKEN_ID = 1234;
const EXPIRATION = 2000000000;
const YEAR = 31536000;

describe("ERC7507", function () {

  async function deployContractFixture() {
    const [deployer, owner, user1, user2] = await ethers.getSigners();

    const contract = await ethers.deployContract("ERC7507", [NAME, SYMBOL], deployer);
    await contract.mint(owner, TOKEN_ID);

    return { contract, owner, user1, user2 };
  }

  describe("Functions", function () {
    it("Should not set user if not owner or approved", async function () {
      const { contract, user1 } = await loadFixture(deployContractFixture);

      await expect(contract.setUser(TOKEN_ID, user1, EXPIRATION))
        .to.be.revertedWith("ERC7507: caller is not owner or approved");
    });

    it("Should return zero expiration for nonexistent user", async function () {
      const { contract, user1 } = await loadFixture(deployContractFixture);

      expect(await contract.userExpires(TOKEN_ID, user1)).to.equal(0);
    });

    it("Should set users and then update", async function () {
      const { contract, owner, user1, user2 } = await loadFixture(deployContractFixture);

      await contract.connect(owner).setUser(TOKEN_ID, user1, EXPIRATION);
      await contract.connect(owner).setUser(TOKEN_ID, user2, EXPIRATION);

      expect(await contract.userExpires(TOKEN_ID, user1)).to.equal(EXPIRATION);
      expect(await contract.userExpires(TOKEN_ID, user2)).to.equal(EXPIRATION);

      await contract.connect(owner).setUser(TOKEN_ID, user1, EXPIRATION + YEAR);
      await contract.connect(owner).setUser(TOKEN_ID, user2, 0);

      expect(await contract.userExpires(TOKEN_ID, user1)).to.equal(EXPIRATION + YEAR);
      expect(await contract.userExpires(TOKEN_ID, user2)).to.equal(0);
    });
  });

  describe("Events", function () {
    it("Should emit event when set user", async function () {
      const { contract, owner, user1 } = await loadFixture(deployContractFixture);

      await expect(contract.connect(owner).setUser(TOKEN_ID, user1, EXPIRATION))
        .to.emit(contract, "UpdateUser").withArgs(TOKEN_ID, user1.address, EXPIRATION);
    });
  });

});

// SPDX-License-Identifier: CC0-1.0

pragma solidity ^0.8.0;

import "@openzeppelin/contracts/token/ERC721/ERC721.sol";

import "./IERC7507.sol";

contract ERC7507 is ERC721, IERC7507 {

    mapping(uint256 => mapping(address => uint64)) private _expires;

    constructor(
        string memory name, string memory symbol
    ) ERC721(name, symbol) {}

    function supportsInterface(
        bytes4 interfaceId
    ) public view virtual override returns (bool) {
        return interfaceId == type(IERC7507).interfaceId || super.supportsInterface(interfaceId);
    }

    function userExpires(
        uint256 tokenId, address user
    ) public view virtual override returns(uint256) {
        require(_exists(tokenId), "ERC7507: query for nonexistent token");
        return _expires[tokenId][user];
    }

    function setUser(
        uint256 tokenId, address user, uint64 expires
    ) public virtual override {
        require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC7507: caller is not owner or approved");
        _expires[tokenId][user] = expires;
        emit UpdateUser(tokenId, user, expires);
    }

}

mapping(uint256 => mapping(address => uint64)) private _expires;

function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
    return interfaceId == type(IERC7507).interfaceId || super.supportsInterface(interfaceId);
}

function userExpires(uint256 tokenId, address user) public view virtual override returns(uint256) {
    require(_exists(tokenId), "ERC7507: query for nonexistent token");
    return _expires[tokenId][user];
}

function setUser(uint256 tokenId, address user, uint64 expires) public virtual override {
    require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC7507: caller is not owner or approved");
    _expires[tokenId][user] = expires;
    emit UpdateUser(tokenId, user, expires);
}