Add nickname retrieval support: implemented NicknameMapper for database queries, updated ChatService to return player names with optional nicknames, and extended /chat/player/{uuid}/name API endpoint.

backend/src/main/java/com/alttd/altitudeweb/controllers/chat/ChatController.java

@@ -2,6 +2,7 @@ package com.alttd.altitudeweb.controllers.chat;
 
 import com.alttd.altitudeweb.api.ChatApi;
 import com.alttd.altitudeweb.model.ChatMessageDto;
+import com.alttd.altitudeweb.model.PlayerNameDto;
 import com.alttd.altitudeweb.model.ServerStateDto;
 import com.alttd.altitudeweb.services.chat.ChatService;
 import lombok.RequiredArgsConstructor;
@@ -11,6 +12,7 @@ import org.springframework.http.ResponseEntity;
 import org.springframework.web.bind.annotation.RestController;
 
 import java.util.List;
+import java.util.UUID;
 
 @Slf4j
 @RestController
@@ -31,4 +33,11 @@ public class ChatController implements ChatApi {
         //TODO [Stijn] [2026-07-18]: Implement handling server state updates (push to listeners)
         throw new UnsupportedOperationException("Not implemented");
     }
+
+    @Override
+    public ResponseEntity<PlayerNameDto> getName(UUID uuid) {
+        return chatService.getPlayerName(uuid)
+                .map(ResponseEntity::ok)
+                .orElse(ResponseEntity.notFound().build());
+    }
 }

backend/src/main/java/com/alttd/altitudeweb/services/chat/ChatService.java

@@ -5,7 +5,10 @@ import com.alttd.altitudeweb.controllers.chat.ChatMessageMapper;
 import com.alttd.altitudeweb.controllers.chat.ChatMessageType;
 import com.alttd.altitudeweb.database.Databases;
 import com.alttd.altitudeweb.database.chat.ChatLogMapper;
+import com.alttd.altitudeweb.database.chat.NicknameMapper;
+import com.alttd.altitudeweb.database.luckperms.UUIDUsernameMapper;
 import com.alttd.altitudeweb.model.PermissionClaimDto;
+import com.alttd.altitudeweb.model.PlayerNameDto;
 import com.alttd.altitudeweb.services.chat.event_publisher.EventPublisher;
 import com.alttd.altitudeweb.services.chat.event_publisher.EventUser;
 import com.alttd.altitudeweb.setup.Connection;
@@ -142,4 +145,22 @@ public class ChatService {
         return chatMessages.tailMap(instant, false).values().stream().toList();
     }
 
+    public Optional<PlayerNameDto> getPlayerName(UUID uuid) {
+        String username = Connection.getConnection(Databases.LUCK_PERMS)
+                .runQueryWithResult(sqlSession -> sqlSession.getMapper(UUIDUsernameMapper.class).getUsernameFromUUID(uuid.toString()));
+
+        if (username == null) {
+            return Optional.empty();
+        }
+
+        Optional<String> nickname = Connection.getConnection(Databases.CHAT)
+                .runQueryWithResult(sqlSession -> sqlSession.getMapper(NicknameMapper.class).getNicknameFromUUID(uuid.toString()));
+
+        PlayerNameDto playerNameDto = new PlayerNameDto();
+        playerNameDto.setName(username);
+        playerNameDto.setNickname(nickname.orElse(null));
+
+        return Optional.of(playerNameDto);
+    }
+
 }