add viewing user profile.

src/main/java/org/to/telegramfinalproject/Server/SidebarService.java

@@ -0,0 +1,57 @@
+package org.to.telegramfinalproject.Server;
+
+import org.json.JSONObject;
+import org.to.telegramfinalproject.Database.userDatabase;
+import org.to.telegramfinalproject.Models.User;
+
+public class SidebarService {
+    private static userDatabase userDB = new userDatabase();
+
+    // Returns current user's profile data (name, bio, status, etc.)
+    public static JSONObject getUserProfile(String userId) {
+        User user = userDB.findByUserId(userId);
+
+        if (user == null) {
+            return null;
+        }
+
+        JSONObject profile = new JSONObject();
+        profile.put("user_id", user.getUser_id());
+        profile.put("profile_name", user.getProfile_name());
+        profile.put("bio", user.getBio() != null ? user.getBio() : "");
+        profile.put("status", "ONLINE");
+        profile.put("profile_picture_url", user.getImage_url());
+
+        return profile;
+    }
+
+    // Updates one or more profile fields for the user
+    public static JSONObject updateUserProfile(String userId, JSONObject updateData) {
+        return null;
+    }
+
+    // Changes the user's profile picture
+    public static JSONObject changeProfilePicture(String userId, byte[] imageData) {
+        return null;
+    }
+
+    // Changes user-id
+    public static JSONObject updateUserId(String userId, String newUserId) {
+        return null;
+    }
+
+    // (Optional) Changes username
+    public static JSONObject updateUserName(String userId, String newUserName) {
+        return null;
+    }
+
+    // Changes user's profile name
+    public static JSONObject updateProfileName(String userId, String newProfileName) {
+        return null;
+    }
+
+    // Changes or sets the user's date of birth
+    public static JSONObject updateDateOfBirth(String userId, String newDateOfBirth) {
+        return null;
+    }
+}