空投合约增加一个可供外部调用的查询可mint列表的方法

contracts/logic/NftDistributor.sol

@@ -161,4 +161,39 @@ contract NftDistributor is AccessControlEnumerable {
     // Return the final mintable count
     return count;
   }
+
+  /**
+   * @dev The getMintableNftIds function gets an array of NFT IDs owned by a user that have not yet been minted.
+   *
+   * This is a read-only function, meaning it doesn't modify the state of the blockchain.
+   * It takes in the address of the user whose mintable NFT IDs are being determined,
+   * and returns an array of the NFT IDs owned by the user that have not yet been minted.
+   *
+   * @param _user - The address of the user whose mintable NFT IDs are being determined
+   * @return mintableNftIds - An array of the NFT IDs owned by the user that have not yet been minted
+   */
+  function getMintableNftIds(
+    address _user
+  ) external view returns (uint256[] memory) {
+    // Get an array of all NFT IDs owned by the user
+    uint256[] memory nfts = ownerToNFTs[_user];
+    // Initialize an array for mintable NFT IDs with the same length as the array of all NFT IDs
+    uint256[] memory mintableNftIds = new uint256[](nfts.length);
+    // Initialize an index counter to zero
+    uint256 index = 0;
+    // Loop through the array of NFT IDs
+    for (uint256 i = 0; i < nfts.length; i++) {
+      // Get the NFT ID at this index of the loop
+      uint256 nftId = nfts[i];
+      // Check if the NFT has not yet been minted
+      if (!nftMinted[nftId]) {
+        // If the NFT has not yet been minted, add it to the mintable NFT IDs array
+        mintableNftIds[index] = nftId;
+        // Increment the index counter
+        index++;
+      }
+    }
+    // Return the array of mintable NFT IDs
+    return mintableNftIds;
+  }
 }