update

.gitignore

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+.DS_Store
+*/node_modules/
+.env
+cache/
+artifacts/
+backend/assets/
+backend/contracts/web3dp-show.sol
+scripts/mint-nft.mjs
+scripts/store-assets.mjs

backend/contracts/web3dp.sol

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+// Contract based on https://docs.openzeppelin.com/contracts/4.x/erc721
+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.12;
+
+import "@openzeppelin/contracts/token/ERC721/ERC721.sol";
+import "@openzeppelin/contracts/token/ERC721/extensions/ERC721Enumerable.sol";
+import "@openzeppelin/contracts/token/ERC721/extensions/ERC721URIStorage.sol";
+import "@openzeppelin/contracts/utils/Counters.sol";
+
+contract Web3DP is ERC721, ERC721Enumerable, ERC721URIStorage{
+   using Counters for Counters.Counter;
+   Counters.Counter private _tokenIds;
+
+   constructor() ERC721("Web3DP", "WP") {}
+
+   function mintNFT(address recipient, string memory uri)
+        public
+       returns (uint256)
+   {
+       _tokenIds.increment();
+
+       uint256 newItemId = _tokenIds.current();
+       _mint(recipient, newItemId);
+       _setTokenURI(newItemId, uri);
+
+       return newItemId;
+   }
+
+    // The following functions are overrides required by Solidity.
+
+    function _beforeTokenTransfer(address from, address to, uint256 tokenIds)
+        internal
+        override(ERC721, ERC721Enumerable)
+    {
+        super._beforeTokenTransfer(from, to, tokenIds);
+    }
+
+    function _burn(uint256 tokenIds) internal override(ERC721, ERC721URIStorage) {
+        super._burn(tokenIds);
+    }
+
+    function tokenURI(uint256 tokenIds)
+        public
+        view
+        override(ERC721, ERC721URIStorage)
+        returns (string memory)
+    {
+        return super.tokenURI(tokenIds);
+    }
+
+    function supportsInterface(bytes4 interfaceId)
+        public
+        view
+        override(ERC721, ERC721Enumerable)
+        returns (bool)
+    {
+        return super.supportsInterface(interfaceId);
+    }
+}

backend/contracts/web3dp_label.sol

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+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.12;
+
+contract Web3DPLabel{
+    struct Label {
+        uint256 label_id;
+        address user;
+        string label;
+        uint256 status;
+        uint256 token_id;
+    }
+
+    // tokenID => Label[]
+    mapping(uint256 => Label[]) public label_map;
+
+    function addLabel(string memory label, uint256 token_id) public {
+        Label memory newLabel = Label(label_map[token_id].length+1, msg.sender, label, 1, token_id);
+        label_map[token_id].push(newLabel);
+    }
+
+    function removeLabel(string memory label, uint256 token_id) public {
+        Label memory newLabel = Label(label_map[token_id].length+1, msg.sender, label, 0, token_id);
+        label_map[token_id].push(newLabel);
+    }
+
+    function getLabels(uint256 token_id) public view returns (Label[] memory) {
+        return label_map[token_id];
+    }
+
+    function getLabel(uint256 token_id, uint256 label_id) public view returns (string memory) {
+        return label_map[token_id][label_id-1].label;
+    }
+
+    function getLabelUser(uint256 token_id, uint256 label_id) public view returns (address) {
+        return label_map[token_id][label_id-1].user;
+    }
+
+    function getLabelStatus(uint256 token_id, uint256 label_id) public view returns (uint256) {
+        return label_map[token_id][label_id-1].status;
+    }
+}

backend/hardhat.config.js

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+/**
+* @type import('hardhat/config').HardhatUserConfig
+*/
+require("@nomiclabs/hardhat-ethers");
+require('dotenv').config();
+const { PRIVATE_KEY } = process.env;
+module.exports = {
+  defaultNetwork: "PolygonMumbai",
+  networks: {
+    hardhat: {
+    },
+    PolygonMumbai : {
+      url: "https://rpc-mumbai.maticvigil.com",
+      accounts: [PRIVATE_KEY]
+    }
+  },
+  solidity: {
+    version: "0.8.12",
+    settings: {
+      optimizer: {
+        enabled: true,
+        runs: 200
+      }
+    }
+  },
+}