Merge pull request #1226 from DeJeune/main

task3: DeJeune

members/DeJeune/task3/.gitignore

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+# Ignore all dot files
+.*
+
+# Except .gitignore
+!.gitignore
+
+# Node modules
+node_modules/
+
+# Dependency directories
+lib/
+
+# Binaries for programs and plugins
+bin/
+obj/
+
+# Solidity output directories
+build/
+artifacts/
+
+
+# Hardhat specific
+cache/
+artifacts/
+
+# Coverage
+coverage/
+coverage.json
+lcov-report/
+
+# Miscellaneous
+.DS_Store
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+
+# build output
+dist/
+
+# environment variables
+.env
+.env.production
+
+# macOS-specific files
+.DS_Store
+._*

members/DeJeune/task3/contracts/nft_exchange/DeJeuneNFT.sol

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+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.18;
+
+import "@openzeppelin/contracts/token/ERC721/ERC721.sol";
+import "@openzeppelin/contracts/utils/Counters.sol";
+
+contract DeJeuneNFT is ERC721 {
+    using Counters for Counters.Counter;
+    Counters.Counter private _nftIDCounter;
+
+    constructor() ERC721("DeJeuneNFT", "DeJeune") {
+        _nftIDCounter.increment();
+    }
+
+    function safeMint(address to) public {
+        uint256 tokenId = _nftIDCounter.current();
+        _nftIDCounter.increment();
+        _safeMint(to, tokenId);
+    }
+}

members/DeJeune/task3/contracts/nft_exchange/NFTMarket.sol

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+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.18;
+
+import "./DeJeuneNFT.sol";
+import "./OpenBuildToken.sol";
+import "./interface/INFTMarket.sol";
+import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
+import "@openzeppelin/contracts/token/ERC721/IERC721.sol";
+import "@openzeppelin/contracts/security/ReentrancyGuard.sol";
+
+contract NFTMarket is INFTMarket, ReentrancyGuard {
+    struct Listing {
+        address seller;
+        address nftContract;
+        uint256 tokenId;
+        uint256 price;
+        bool isActivate;
+    }
+
+    mapping(address => mapping(uint256 => Listing)) public listings;
+    IERC20 public paymentToken;
+
+    constructor(address _paymentToken){ 
+        paymentToken = IERC20(_paymentToken);
+    }
+
+    function listNFT(address _nftContract, uint256 _tokenId, uint256 _price) external {
+        IERC721 nft = IERC721(_nftContract);
+        require(nft.ownerOf(_tokenId) == msg.sender, "Not the owner of the NFT");
+        require(nft.isApprovedForAll(msg.sender, address(this)), "Contract not approved");
+        listings[_nftContract][_tokenId] = Listing(msg.sender, _nftContract, _tokenId, _price, true);
+
+        emit NFTListed(msg.sender, _nftContract, _tokenId, _price);
+    }
+
+    function buyNFT(address _nftContract, uint256 _tokenId) external nonReentrant{
+        Listing storage listing = listings[_nftContract][_tokenId];
+        require(listing.isActivate, "NFT not listed for sale");
+
+        IERC721 nft = IERC721(_nftContract);
+        require(paymentToken.transferFrom(msg.sender, listing.seller, listing.price), "payment failed");
+        nft.safeTransferFrom(listing.seller, msg.sender, _tokenId);
+        listing.isActivate = false;
+
+        emit NFTPurchased(msg.sender, _nftContract, _tokenId, listing.price);
+
+    }
+}

members/DeJeune/task3/contracts/nft_exchange/OpenBuildToken.sol

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+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.18;
+
+import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
+
+contract OpenBuildToken is ERC20 {
+    constructor() ERC20("OpenBuildToken", "MTK") {
+        _mint(msg.sender, 10000000000 * 10 * 6);
+    }
+
+    function decimals() public view virtual override returns(uint8){
+        return 6;
+    }
+}

members/DeJeune/task3/contracts/nft_exchange/interface/INFTMarket.sol

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+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.18;
+
+interface INFTMarket {
+    event NFTListed(
+        address indexed seller,
+        address indexed nftContract,
+        uint256 indexed tokenId,
+        uint256 price
+    );
+
+    event NFTPurchased(
+        address indexed buyer,
+        address indexed nftContract,
+        uint256 indexed tokenId,
+        uint256 price
+    );
+
+    function listNFT(address _nftContract, uint256 _tokenId, uint256 _price) external;
+    function buyNFT(address _nftContract, uint256 _tokenId) external;
+}

members/DeJeune/task3/readme.md

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+1. 上架NFT交易哈希
+0x6a1d640e088a32db2b31edfbb5fea7102570382c7da0d153875ffaabc0317cf9
+2. 购买NFT交易哈希
+0x8bb6556a23791f9df7b829dc9deb6ef2248570f211f3a3d2558bd327e43df450