Add example nft bridge contract for exist ERC721 contracts

contracts/example_nft_bridge.sol

@@ -0,0 +1,25 @@
+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.0;
+
+import "./public_data_storage.sol";
+import "@openzeppelin/contracts/token/ERC721/IERC721.sol";
+
+contract NFTBridge is IERCPublicDataContract {
+ IERC721 nftAddress;
+
+ mapping (bytes32 => uint) hashToTokenId;
+
+ constructor(IERC721 _nftAddress) {
+ nftAddress = _nftAddress;
+ }
+
+ function addTokenId(bytes32[] calldata dataMixedHash, uint256[] calldata tokenId) public {
+ for (uint i = 0; i < dataMixedHash.length; i++) {
+ hashToTokenId[dataMixedHash[i]] = tokenId[i];
+ }
+ }
+
+ function getDataOwner(bytes32 dataMixedHash) public view returns (address) {
+ return nftAddress.ownerOf(tokenId);
+ }
+}

contracts/public_data_storage.sol

@@ -3,7 +3,6 @@ pragma solidity ^0.8.0;
 import "./gwt.sol";
 import "./sortedlist.sol";
 import "./PublicDataProof.sol";
-import "./nft_bridge.sol";
 
 import "@openzeppelin/contracts-upgradeable/proxy/utils/Initializable.sol";
 import "@openzeppelin/contracts-upgradeable/proxy/utils/UUPSUpgradeable.sol";
@@ -239,7 +238,7 @@ contract PublicDataStorage is Initializable, UUPSUpgradeable, OwnableUpgradeable
  require(dataMixedHash != bytes32(0), "data hash is empty");
  require(_allowedPublicDataContract[publicDataContract], " data contract not allowed");
  require(IERCPublicDataContract(publicDataContract).getDataOwner(dataMixedHash) != address(0), "not found in data contract");
- 
+
  // 质押率影响用户SHOW数据所需要冻结的质押
  require(depositRatio >= sysConfig.minDepositRatio, "deposit ratio is too small");
  // minAmount = 数据大小*GWT兑换比例*最小时长*质押率