feat: lookup nft ownership (#74)

#74

contracts/INationCred.sol

@@ -14,5 +14,5 @@ interface INationCred {
      *
      * @param citizen The address of an NFT passport's owner
      */
-    function isActive(address citizen) external view returns (bool);
+    function isActiveByAddress(address citizen) external view returns (bool);
 }

contracts/NationCred.sol

@@ -1,18 +1,20 @@
 //SPDX-License-Identifier: GPL-3.0-or-later
 pragma solidity ^0.8.17;
 
-import "./INationCred.sol";
+import {INationCred} from "./INationCred.sol";
+import {IERC721} from "@openzeppelin/contracts/interfaces/IERC721.sol";
 
 /**
  * @notice Stores the passport IDs of active Nation3 citizens.
  */
 contract NationCred is INationCred {
     address public owner;
-
+    IERC721 public passport;
     uint16[] private passportIDs;
 
     constructor() {
         owner = address(msg.sender);
+        passport = IERC721(0x3337dac9F251d4E403D6030E18e3cfB6a2cb1333);
     }
 
     function setOwner(address owner_) public {
@@ -33,4 +35,15 @@ contract NationCred is INationCred {
         }
         return false;
     }
+
+    function isActiveByAddress(address citizen) public view returns (bool) {
+        for (uint16 i = 0; i < passportIDs.length; i++) {
+            uint256 passportID = passportIDs[i];
+            address passportOwner = passport.ownerOf(passportID);
+            if (passportOwner == citizen) {
+                return true;
+            }
+        }
+        return false;
+    }
 }

package.json

@@ -41,6 +41,6 @@
     "typescript": "^5.0.3"
   },
   "dependencies": {
-    "@openzeppelin/contracts": "^4.8.0"
+    "@openzeppelin/contracts": "^4.9.3"
   }
 }