[chusan] Add experimental New Plus support

src/main/java/icu/samnyan/aqua/sega/chusan/handler/impl/GetUserNetBattleDataHandler.java

@@ -0,0 +1,43 @@
+package icu.samnyan.aqua.sega.chusan.handler.impl;
+
+import com.fasterxml.jackson.core.JsonProcessingException;
+import icu.samnyan.aqua.sega.chusan.handler.BaseHandler;
+import icu.samnyan.aqua.sega.util.jackson.StringMapper;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Component;
+
+import java.util.LinkedHashMap;
+import java.util.List;
+import java.util.Map;
+
+@Component("ChusanGetUserNetBattleDataHandler")
+public class GetUserNetBattleDataHandler  implements BaseHandler {
+
+    private static final Logger logger = LoggerFactory.getLogger(GetUserNetBattleDataHandler.class);
+
+    private final StringMapper mapper;
+
+    @Autowired
+    public GetUserNetBattleDataHandler(StringMapper mapper) {
+        this.mapper = mapper;
+    }
+
+    @Override
+    public String handle(Map<String, Object> request) throws JsonProcessingException {
+        String userId = (String) request.get("userId");
+
+        Map<String, Object> resultMap = new LinkedHashMap<>();
+        resultMap.put("userId", userId);
+
+        Map<String, Object> userNetBattleData = new LinkedHashMap<>();
+        userNetBattleData.put("recentNBSelectMusicList", List.of());
+
+        resultMap.put("userNetBattleData", userNetBattleData);
+
+        String json = mapper.write(resultMap);
+        logger.info("Response: " + json);
+        return json;
+    }
+}