Authenticated call: NFT example (#206)

examples/nft/.eslintignore

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+.yarn
+artifacts
+cache
+coverage
+node_modules
+typechain-types

examples/nft/.eslintrc.js

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+const path = require("path");
+
+/**
+ * @type {import("eslint").Linter.Config}
+ */
+module.exports = {
+  env: {
+    browser: false,
+    es2021: true,
+    mocha: true,
+    node: true,
+  },
+  extends: ["plugin:prettier/recommended"],
+  parser: "@typescript-eslint/parser",
+  parserOptions: {
+    ecmaVersion: 12,
+  },
+  plugins: [
+    "@typescript-eslint",
+    "prettier",
+    "simple-import-sort",
+    "sort-keys-fix",
+    "typescript-sort-keys",
+  ],
+  rules: {
+    "@typescript-eslint/sort-type-union-intersection-members": "error",
+    camelcase: "off",
+    "simple-import-sort/exports": "error",
+    "simple-import-sort/imports": "error",
+    "sort-keys-fix/sort-keys-fix": "error",
+    "typescript-sort-keys/interface": "error",
+    "typescript-sort-keys/string-enum": "error",
+  },
+  settings: {
+    "import/parsers": {
+      "@typescript-eslint/parser": [".js", ".jsx", ".ts", ".tsx", ".d.ts"],
+    },
+    "import/resolver": {
+      node: {
+        extensions: [".js", ".jsx", ".ts", ".tsx", ".d.ts"],
+      },
+      typescript: {
+        project: path.join(__dirname, "tsconfig.json"),
+      },
+    },
+  },
+};

examples/nft/.gitignore

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+node_modules
+.env
+coverage
+coverage.json
+typechain
+typechain-types
+dependencies
+
+# Hardhat files
+cache
+artifacts
+
+# Foundry files
+out
+cache_forge
+
+access_token

examples/nft/LICENSE

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+MIT License
+
+Copyright (c) 2023 ZetaChain
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

examples/nft/README.md

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+# NFT Example
+
+This example currently only works with localnet `v4.0.0-rc*`, which supports
+authenticated calls and multiple EVM chains.

examples/nft/contracts/Connected.sol

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+// SPDX-License-Identifier: MIT
+pragma solidity 0.8.26;
+
+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/access/Ownable.sol";
+import "@openzeppelin/contracts/token/ERC721/extensions/ERC721Burnable.sol";
+import "@zetachain/protocol-contracts/contracts/evm/GatewayEVM.sol";
+import {RevertContext} from "@zetachain/protocol-contracts/contracts/Revert.sol";
+
+contract Connected is ERC721, ERC721Enumerable, ERC721URIStorage, Ownable {
+    GatewayEVM public immutable gateway;
+    uint256 private _nextTokenId;
+    address public counterparty;
+
+    function setCounterparty(address contractAddress) external onlyOwner {
+        counterparty = contractAddress;
+    }
+
+    constructor(
+        address payable gatewayAddress,
+        address initialOwner
+    ) ERC721("MyToken", "MTK") Ownable(initialOwner) {
+        gateway = GatewayEVM(gatewayAddress);
+    }
+
+    function safeMint(address to, string memory uri) public onlyOwner {
+        uint256 hash = uint256(
+            keccak256(
+                abi.encodePacked(address(this), block.number, _nextTokenId++)
+            )
+        );
+
+        uint256 tokenId = hash & 0x00FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF;
+
+        _safeMint(to, tokenId);
+        _setTokenURI(tokenId, uri);
+    }
+
+    function transferCrossChain(
+        uint256 tokenId,
+        address receiver,
+        address destination
+    ) external payable {
+        string memory uri = tokenURI(tokenId);
+        _burn(tokenId);
+        bytes memory encodedData = abi.encode(
+            tokenId,
+            msg.sender,
+            uri,
+            destination
+        );
+
+        RevertOptions memory revertOptions = RevertOptions(
+            address(this),
+            true,
+            address(0),
+            encodedData,
+            0
+        );
+
+        if (destination == address(0)) {
+            gateway.call(receiver, encodedData, revertOptions);
+        } else {
+            gateway.depositAndCall{value: msg.value}(
+                receiver,
+                encodedData,
+                revertOptions
+            );
+        }
+    }
+
+    function onCall(
+        MessageContext calldata messageContext,
+        bytes calldata message
+    ) external payable returns (bytes4) {
+        if (messageContext.sender != counterparty) revert("Unauthorized");
+
+        (uint256 tokenId, address sender, string memory uri) = abi.decode(
+            message,
+            (uint256, address, string)
+        );
+        _safeMint(sender, tokenId);
+        _setTokenURI(tokenId, uri);
+        return "";
+    }
+
+    function onRevert(RevertContext calldata context) external {
+        (uint256 tokenId, address sender, string memory uri) = abi.decode(
+            context.revertMessage,
+            (uint256, address, string)
+        );
+
+        _safeMint(sender, tokenId);
+        _setTokenURI(tokenId, uri);
+    }
+
+    receive() external payable {}
+
+    fallback() external payable {}
+
+    // The following functions are overrides required by Solidity.
+
+    function _update(
+        address to,
+        uint256 tokenId,
+        address auth
+    ) internal override(ERC721, ERC721Enumerable) returns (address) {
+        return super._update(to, tokenId, auth);
+    }
+
+    function _increaseBalance(
+        address account,
+        uint128 value
+    ) internal override(ERC721, ERC721Enumerable) {
+        super._increaseBalance(account, value);
+    }
+
+    function tokenURI(
+        uint256 tokenId
+    ) public view override(ERC721, ERC721URIStorage) returns (string memory) {
+        return super.tokenURI(tokenId);
+    }
+
+    function supportsInterface(
+        bytes4 interfaceId
+    )
+        public
+        view
+        override(ERC721, ERC721Enumerable, ERC721URIStorage)
+        returns (bool)
+    {
+        return super.supportsInterface(interfaceId);
+    }
+}