Merge pull request #1078 from warku123/task3

task3: warku123

members/warku123/task3/MyNFT.sol

@@ -0,0 +1,20 @@
+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.20;
+
+import "@openzeppelin/contracts/token/ERC721/ERC721.sol";
+import "@openzeppelin/contracts/utils/Counters.sol";
+
+contract MyNFT is ERC721 {
+    using Counters for Counters.Counter;
+    Counters.Counter private _tokenIdCounter;
+
+    constructor() ERC721("PiGNFT", "PFT") {
+        _tokenIdCounter.increment();
+    }
+
+    function mint(address to) public {
+        uint256 tokenId = _tokenIdCounter.current();
+        _safeMint(to, tokenId);
+        _tokenIdCounter.increment();
+    }
+}

members/warku123/task3/MyToken.sol

@@ -0,0 +1,15 @@
+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.20;
+
+import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
+
+contract MyToken is ERC20 {
+    constructor() ERC20("PiGToken", "PGK")
+    {
+        _mint(msg.sender, 10000000000*10**6);
+    }
+
+    function decimals() public view virtual override returns (uint8) {
+        return 6;
+    }
+}

members/warku123/task3/NFTMarket.sol

@@ -0,0 +1,45 @@
+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.20;
+
+import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
+import "@openzeppelin/contracts/token/ERC721/IERC721.sol";
+import "@openzeppelin/contracts/security/ReentrancyGuard.sol";
+
+contract NFTMarket is ReentrancyGuard {
+    struct Listing {
+        address seller;
+        address nftContract;
+        uint256 tokenId;
+        uint256 price;
+    }
+
+    IERC20 public paymentToken;
+    mapping(uint256 => Listing) public listings;
+    uint256 public nextListingId;
+    event NFTListed(uint256 listingId, address seller, address nftContract, uint256 tokenId, uint256 price);
+    event NFTPurchased(uint256 listingId, address buyer);
+
+    constructor(address _paymentToken) {
+        paymentToken = IERC20(_paymentToken);
+    }
+
+    function listNFT(address nftContract, uint256 tokenId, uint256 price) external nonReentrant {
+        require(price > 0, "Price must be greater than zero");
+
+        IERC721(nftContract).transferFrom(msg.sender, address(this), tokenId);
+        listings[nextListingId] = Listing(msg.sender, nftContract, tokenId, price);
+        emit NFTListed(nextListingId, msg.sender, nftContract, tokenId, price);
+        nextListingId++;
+    }
+
+    function buyNFT(uint256 listingId) external nonReentrant {
+        Listing storage listing = listings[listingId];
+        require(listing.price > 0, "NFT not listed for sale");
+
+        paymentToken.transferFrom(msg.sender, listing.seller, listing.price);
+        IERC721(listing.nftContract).transferFrom(address(this), msg.sender, listing.tokenId);
+
+        emit NFTPurchased(listingId, msg.sender);
+        delete listings[listingId];
+    }
+}

members/warku123/task3/task3.md

@@ -0,0 +1,8 @@
+| 说明       | 地址                                                         |
+| ---------- | ------------------------------------------------------------ |
+| PGT(token) | 0xcEDC4aE58aE7748453fF31a4db1F264E198586d9                   |
+| PFT(NFT)   | 0x6C98BeB91Afa81817E7248fCaf7603d947938983                   |
+| NFTMarket  | 0x1E850f5010E94B70de98085Afe2DD434322DdF40                   |
+| 上架 NFT   | 0xdcd7f2f88f40be37fd7912dc9aed407e85962005c55106958c500ec13060cc4e |
+| 购买 NFT   | 0x3947f2e5514f426d02c666bdab2436fc5845168752f39f2eec37a04b3574c5c4 |
+