Use HTS NFTs as if they're deployed ERC721/IERC721Metadata/IERC721Enumerable contracts

.github/workflows/test.yml

@@ -43,17 +43,16 @@ jobs:
           sudo curl -SL -o /usr/local/bin/docker-compose https://github.com/docker/compose/releases/download/1.29.2/docker-compose-Linux-x86_64
           sudo chmod +x /usr/local/bin/docker-compose
 
-      - name: Prepare the local node
-        run: |
-          echo 'hedera.recordStream.compressFilesOnCreation=true' >> node_modules/@hashgraph/hedera-local/compose-network/network-node/data/config/bootstrap.properties
-          echo 'contracts.chainId=298' >> node_modules/@hashgraph/hedera-local/compose-network/network-node/data/config/bootstrap.properties
-          sed -i 's/      STREAM_EXTENSION: "rcd"/      STREAM_EXTENSION: "rcd.gz"/' node_modules/@hashgraph/hedera-local/docker-compose.yml
-
       - name: Start the local node
-        run: npx hedera start -d
+        run: npx hedera start -d --network local
 
-      - name: Run tests
-        run: npx hardhat test
+      - name: Run the tests
+        uses: nick-fields/retry@v2
+        with:
+          max_attempts: 3
+          timeout_minutes: 10
+          retry_wait_seconds: 60
+          command: npx hardhat test
 
       - name: Stop the local node
         run: npx hedera stop

contracts/hts-precompile/examples/erc-721/ERC721Contract.sol

@@ -31,10 +31,17 @@ contract ERC721Contract {
         return IERC721Enumerable(token).totalSupply();
     }
 
+    // The `to` address will receive approval by the contract itself
+    // Be aware that the nft must be owned by the contract, not by the msg.sender address
     function approve(address token, address to, uint256 tokenId) external payable {
         IERC721(token).approve(to, tokenId);
     }
 
+    // The `to` address will receive approval by msg.sender
+    function delegateApprove(address token, address to, uint256 tokenId) external payable {
+        address(IERC721(token)).delegatecall(abi.encodeWithSignature("approve(address,uint256)", to, tokenId));
+    }
+
     function setApprovalForAll(address token, address operator, bool approved) external {
         IERC721(token).setApprovalForAll(operator, approved);
     }
@@ -47,10 +54,16 @@ contract ERC721Contract {
         return IERC721(token).isApprovedForAll(owner, operator);
     }
 
+    // The call will be executed by the contract itself, so the contract address has to be the owner of `tokenId`
     function transferFrom(address token, address from, address to, uint256 tokenId) external payable {
         IERC721(token).transferFrom(from, to, tokenId);
     }
 
+    // The call will be executed by the msg.sender address
+    function delegateTransferFrom(address token, address from, address to, uint256 tokenId) external payable {
+        address(IERC721(token)).delegatecall(abi.encodeWithSignature("transferFrom(address,address,uint256)", from, to, tokenId));
+    }
+
     // Not supported operations - should return a failure
 
     function safeTransferFrom(address token, address from, address to, uint256 tokenId) external payable {

hardhat.config.js

@@ -2,6 +2,9 @@ require("@nomicfoundation/hardhat-chai-matchers");
 
 /** @type import('hardhat/config').HardhatUserConfig */
 module.exports = {
+  mocha: {
+    timeout: 3600000
+  },
   solidity: {
     version: "0.8.9",
     settings: {
@@ -16,7 +19,8 @@ module.exports = {
     relay: {
       url: 'http://localhost:7546',
       accounts: [
-        "0x2e1d968b041d84dd120a5860cee60cd83f9374ef527ca86996317ada3d0d03e7"
+        "0x2e1d968b041d84dd120a5860cee60cd83f9374ef527ca86996317ada3d0d03e7",
+        "0x45a5a7108a18dd5013cf2d5857a28144beadc9c70b3bdbd914e38df4e804b8d8"
       ],
       chainId: 298,
     }