Added new RCON command

sqlupdates/3_0_0 to 3_0_1.sql

@@ -88,3 +88,6 @@ INSERT INTO `emulator_settings` (`key`, `value`) VALUES ('moodlight.color_check.
 
 -- Mannequin name
 INSERT INTO `emulator_texts` (`key`, `value`) VALUES ('hotel.mannequin.name.default', 'My look');
+
+-- RCON: Change Username
+INSERT INTO `emulator_texts` (`key`, `value`) VALUES ('rcon.alert.user.change_username', 'You can change your username. Click on yourself to change it.');

src/main/java/com/eu/habbo/messages/rcon/ChangeUsername.java

@@ -0,0 +1,71 @@
+package com.eu.habbo.messages.rcon;
+
+import com.eu.habbo.Emulator;
+import com.eu.habbo.habbohotel.users.Habbo;
+import com.eu.habbo.habbohotel.users.HabboInfo;
+import com.eu.habbo.habbohotel.users.subscriptions.Subscription;
+import com.eu.habbo.messages.outgoing.users.UserDataComposer;
+import com.google.gson.Gson;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.sql.Connection;
+import java.sql.PreparedStatement;
+import java.sql.SQLException;
+
+public class ChangeUsername extends RCONMessage<ChangeUsername.JSON> {
+    private static final Logger LOGGER = LoggerFactory.getLogger(ChangeUsername.class);
+
+    public ChangeUsername() {
+        super(ChangeUsername.JSON.class);
+    }
+
+    @Override
+    public void handle(Gson gson, JSON json) {
+        try {
+            if (json.user_id <= 0) {
+                this.status = RCONMessage.HABBO_NOT_FOUND;
+                this.message = "User not found";
+                return;
+            }
+
+            boolean success = true;
+
+            Habbo habbo = Emulator.getGameServer().getGameClientManager().getHabbo(json.user_id);
+            if (habbo != null) {
+                if (json.canChange)
+                    habbo.alert(Emulator.getTexts().getValue("rcon.alert.user.change_username"));
+
+                habbo.getHabboStats().allowNameChange = json.canChange;
+                habbo.getClient().sendResponse(new UserDataComposer(habbo));
+            } else {
+                try (Connection connection = Emulator.getDatabase().getDataSource().getConnection()) {
+                    try (PreparedStatement statement = connection.prepareStatement("UPDATE users_settings SET allow_name_change = ? WHERE user_id = ? LIMIT 1")) {
+                        statement.setBoolean(1, json.canChange);
+                        statement.setInt(2, json.user_id);
+
+                        success = statement.executeUpdate() >= 1;
+                    } catch (SQLException sqlException) {
+                        sqlException.printStackTrace();
+                    }
+                } catch (SQLException sqlException) {
+                    sqlException.printStackTrace();
+                }
+            }
+
+            this.status = success ? RCONMessage.STATUS_OK : RCONMessage.STATUS_ERROR;
+            this.message = success ? "Sent successfully." : "There was an error updating this user.";
+        }
+        catch (Exception e) {
+            this.status = RCONMessage.SYSTEM_ERROR;
+            this.message = "Exception occurred";
+            LOGGER.error("Exception occurred", e);
+        }
+    }
+
+    static class JSON {
+        public int user_id;
+
+        public boolean canChange;
+    }
+}

src/main/java/com/eu/habbo/networking/rconserver/RCONServer.java

@@ -62,6 +62,7 @@ public class RCONServer extends Server {
         this.addRCONMessage("setmotto", SetMotto.class);
         this.addRCONMessage("giveuserclothing", GiveUserClothing.class);
         this.addRCONMessage("modifysubscription", ModifyUserSubscription.class);
+        this.addRCONMessage("changeusername", ChangeUsername.class);
 
         Collections.addAll(this.allowedAdresses, Emulator.getConfig().getValue("rcon.allowed", "127.0.0.1").split(";"));
     }