feat: added NFT Marketplace Contract Tutorial

timosanmaz · Jul 15, 2022 · 106470a · 106470a
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diff --git a/5x3_NFTMarketplaceContract/NFTMarketplace/NFTMarketplace.sol b/5x3_NFTMarketplaceContract/NFTMarketplace/NFTMarketplace.sol
@@ -0,0 +1,122 @@
+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.13;
+
+import "@openzeppelin/contracts/token/ERC721/IERC721.sol";
+
+contract NFTMarketplace  {
+    address public owner;
+    uint idForSale;
+    uint idForAuction;
+
+    struct ItemForSale{
+        address contractAddress;
+        address seller;
+        address buyer;
+        uint price;
+        uint tokenId;
+        bool state;
+    }
+
+    struct ItemForAuction{
+        address contractAddress;
+        address seller;
+        address buyer;
+        uint startingPrice;
+        uint highestBid;
+        uint tokenId;
+        uint deadline;
+        bool state;
+    }
+
+    mapping(uint => ItemForSale) public idToItemForSale;
+    mapping(uint => ItemForAuction) public idToItemForAuction;
+
+    constructor() {
+        owner = msg.sender;
+    }
+
+    function startNFTSale(address contractAddress, uint price, uint tokenId) public {
+        IERC721 NFT = IERC721(contractAddress);
+        require(NFT.ownerOf(tokenId) == msg.sender, "You are not owner of this NFT!");
+        NFT.transferFrom(msg.sender, address(this), tokenId);
+        idToItemForSale[idForSale] = ItemForSale(contractAddress, msg.sender, msg.sender,price,tokenId,false);
+        idForSale += 1;
+    }
+
+    function cancelNFTSale(uint Id) public {
+        ItemForSale memory info = idToItemForSale[Id];
+        IERC721 NFT = IERC721(info.contractAddress);
+        require(info.seller == msg.sender, "You are not owner of this NFT!");
+        require(info.state == false, "This NFT sold!");
+        NFT.transferFrom(address(this), msg.sender, info.tokenId);
+        idToItemForSale[Id] = ItemForSale(address(0), address(0), address(0),0,0,true);
+    }
+
+    function startNFTAuction(address contractAddress, uint price, uint tokenId, uint deadline) public {
+        IERC721 NFT = IERC721(contractAddress);
+        require(NFT.ownerOf(tokenId) == msg.sender, "You are not owner of this NFT!");
+        NFT.transferFrom(msg.sender, address(this), tokenId);
+        idToItemForAuction[idForAuction] = ItemForAuction(contractAddress, msg.sender, msg.sender,price,0,tokenId,deadline,false);
+        idForAuction += 1;
+    }
+
+    function cancelNFTAuction(uint Id) public {
+        ItemForAuction memory info = idToItemForAuction[Id];
+        IERC721 NFT = IERC721(info.contractAddress);
+        require(info.seller == msg.sender, "You are not owner of this NFT!");
+        require(info.state == false, "This NFT sold!");
+        NFT.transferFrom(address(this), msg.sender, info.tokenId);
+        idToItemForAuction[Id] = ItemForAuction(address(0), address(0), address(0),0,0,0,0,true);
+    }
+
+
+    function buyNFT(uint Id) payable public {
+        ItemForSale storage info = idToItemForSale[Id];
+        require(Id < idForSale);
+        require(msg.sender != info.seller, "You are seller");
+        require(msg.value == info.price, "Wrong Price!");
+        require(info.state == false, "Cannot buy!");
+        IERC721 NFT = IERC721(info.contractAddress);
+        NFT.transferFrom(address(this), msg.sender, info.tokenId);
+        uint price = msg.value * 95 / 100;
+        payable(info.seller).transfer(price);
+        payable(owner).transfer(msg.value - price);
+        info.buyer = msg.sender;
+        info.state = true;
+    }
+
+    function bid(uint Id) payable public {
+        ItemForAuction storage info = idToItemForAuction[Id];
+        require(Id < idForAuction);
+        require(msg.sender != info.seller, "You are seller");
+        require(msg.sender != info.buyer, "You have highest bid!");
+        require(msg.value >= info.startingPrice, "Wrong Price!");
+        require(msg.value > info.highestBid, "Wrong Price!");
+        require(info.state == false, "Cannot buy!");
+        require(block.timestamp < info.deadline, "Deadline!");
+        if(info.seller == info.buyer){
+            info.buyer = msg.sender;
+            info.highestBid = msg.value;
+        }else{
+            payable(info.buyer).transfer(info.highestBid);
+            info.buyer = msg.sender;
+            info.highestBid = msg.value;
+        }
+    }
+
+    function finishNFTAuction(uint Id) payable public {
+        ItemForAuction storage info = idToItemForAuction[Id];
+        require(Id < idForAuction);
+        require(msg.sender == info.buyer, "You have highest bid!");
+        require(info.state == false, "Already finished!");
+        require(block.timestamp > info.deadline, "Deadline!");
+        require(info.buyer != info.seller, "There is no bid!");
+        IERC721 NFT = IERC721(info.contractAddress);
+        NFT.transferFrom(address(this), msg.sender, info.tokenId);
+        uint price = info.highestBid * 95 / 100;
+        payable(info.seller).transfer(price);
+        payable(owner).transfer(msg.value - price);
+        info.state = true;
+    }
+
+}
diff --git a/5x3_NFTMarketplaceContract/README.md b/5x3_NFTMarketplaceContract/README.md
@@ -0,0 +1,109 @@
+# Smart Contract Developer Bootcamp - İTÜ Blockchain
+
+Bu dersimizde en çok kullanılan token standartlarını incelenin ardından, kullanıcıların sahip oldukları NFT'lerin kimseye güvenmeden bir başkasına satabilmesini sağlayan NFT Marketplace kontratını yazdık. Temel amacı marketplace'in tam olarak ne yaptığının anlaşılmasını amaçlayan bu kontratta direk satış ve açık arttırma özellikleri bulunuyor.
+
+<br/>
+
+# NFT Marketplace dokümantasyonları
+
+* [What is NFT Marketplace?](https://www.coindesk.com/tech/2021/07/12/nft-marketplaces-a-beginners-guide/)
+
+
+
+### Start NFT Sale
+NFT sahibinin NFT'sini belirli bir fiyata satışa çıkarabilmesini sağlayan fonksiyon.
+
+``` javascript
+    function startNFTSale(address contractAddress, uint price, uint tokenId) public {
+        IERC721 NFT = IERC721(contractAddress);
+        require(NFT.ownerOf(tokenId) == msg.sender, "You are not owner of this NFT!");
+        NFT.transferFrom(msg.sender, address(this), tokenId);
+        idToItemForSale[idForSale] = ItemForSale(contractAddress, msg.sender, msg.sender,price,tokenId,false);
+        idForSale += 1;
+    }
+```
+
+
+### Start NFT Auction
+NFT sahibinin NFT'sini açık arttırma ile satışa çıkarabilmesini sağlayan fonksiyon.
+
+``` javascript
+    function startNFTAuction(address contractAddress, uint price, uint tokenId, uint deadline) public {
+        IERC721 NFT = IERC721(contractAddress);
+        require(NFT.ownerOf(tokenId) == msg.sender, "You are not owner of this NFT!");
+        NFT.transferFrom(msg.sender, address(this), tokenId);
+        idToItemForAuction[idForAuction] = ItemForAuction(contractAddress, msg.sender, msg.sender,price,0,tokenId,deadline,false);
+        idForAuction += 1;
+    }
+```
+
+### Buy NFT
+Satışa çıkarılmış bir NFT'nin istenilen ücreti ödeme şartıyla satın alınabilmesini sağlayan fonksiyon.
+
+``` javascript
+    function buyNFT(uint Id) payable public {
+        ItemForSale storage info = idToItemForSale[Id];
+        require(Id < idForSale);
+        require(msg.sender != info.seller, "You are seller");
+        require(msg.value == info.price, "Wrong Price!");
+        require(info.state == false, "Cannot buy!");
+        IERC721 NFT = IERC721(info.contractAddress);
+        NFT.transferFrom(address(this), msg.sender, info.tokenId);
+        uint price = msg.value * 95 / 100;
+        payable(info.seller).transfer(price);
+        payable(owner).transfer(msg.value - price);
+        info.buyer = msg.sender;
+        info.state = true;
+    }
+```
+
+
+### Bid
+Açık arttırılmaya çıkarılmış bir NFT için bu fonksiyonu kullanarak teklifte bulunabiliriz.
+
+``` javascript
+    function bid(uint Id) payable public {
+        ItemForAuction storage info = idToItemForAuction[Id];
+        require(Id < idForAuction);
+        require(msg.sender != info.seller, "You are seller");
+        require(msg.sender != info.buyer, "You have highest bid!");
+        require(msg.value >= info.startingPrice, "Wrong Price!");
+        require(msg.value > info.highestBid, "Wrong Price!");
+        require(info.state == false, "Cannot buy!");
+        require(block.timestamp < info.deadline, "Deadline!");
+        if(info.seller == info.buyer){
+            info.buyer = msg.sender;
+            info.highestBid = msg.value;
+        }else{
+            payable(info.buyer).transfer(info.highestBid);
+            info.buyer = msg.sender;
+            info.highestBid = msg.value;
+        }
+    }
+```
+
+### Finish NFT Auction
+Bu fonksiyon ile açık arttırma için belirlenin bitmesinin ardından NFT'nin yeni sahibine, paranında satıcıya gönderilmesi sağlanır.
+
+``` javascript
+    function finishNFTAuction(uint Id) payable public {
+        ItemForAuction storage info = idToItemForAuction[Id];
+        require(Id < idForAuction);
+        require(msg.sender == info.buyer, "You have highest bid!");
+        require(info.state == false, "Already finished!");
+        require(block.timestamp > info.deadline, "Deadline!");
+        require(info.buyer != info.seller, "There is no bid!");
+        IERC721 NFT = IERC721(info.contractAddress);
+        NFT.transferFrom(address(this), msg.sender, info.tokenId);
+        uint price = info.highestBid * 95 / 100;
+        payable(info.seller).transfer(price);
+        payable(owner).transfer(msg.value - price);
+        info.state = true;
+    }
+```
+
+<br/>
+
+[Video İçeriği](https://www.youtube.com/watch?v=zf4orRramo4)
+
+[Proje Dizini](./NFTMarketplace)