fix(rcon): validate offline badge targets

GiveBadge could treat a missing offline user as eligible for a badge and insert through a nullable user subquery. Depending on SQL mode this could fail late or persist an orphaned user_id value. Resolve the offline user first, return HABBO_NOT_FOUND when absent, and insert badges with the resolved user id only.

Emulator/src/main/java/com/eu/habbo/messages/rcon/GiveBadge.java

@@ -3,6 +3,8 @@ package com.eu.habbo.messages.rcon;
 import com.eu.habbo.Emulator;
 import com.eu.habbo.habbohotel.users.Habbo;
 import com.eu.habbo.habbohotel.users.HabboBadge;
+import com.eu.habbo.habbohotel.users.HabboInfo;
+import com.eu.habbo.habbohotel.users.HabboManager;
 import com.eu.habbo.messages.outgoing.users.AddUserBadgeComposer;
 import com.google.gson.Gson;
 import jakarta.validation.constraints.NotBlank;
@@ -57,11 +59,18 @@ public class GiveBadge extends RCONMessage<GiveBadge.GiveBadgeJSON> {
                 this.message = Emulator.getTexts().getValue("commands.succes.cmd_badge.given").replace("%user%", username).replace("%badge%", badgeCode);
             }
         } else {
+            HabboInfo habboInfo = HabboManager.getOfflineHabboInfo(json.user_id);
+            if (habboInfo == null) {
+                this.status = RCONMessage.HABBO_NOT_FOUND;
+                return;
+            }
+
+            username = habboInfo.getUsername();
             try (Connection connection = Emulator.getDatabase().getDataSource().getConnection()) {
                 for (String badgeCode : json.badge.split(";")) {
                     int numberOfRows = 0;
-                    try (PreparedStatement statement = connection.prepareStatement("SELECT COUNT(slot_id) FROM users_badges INNER JOIN users ON users.id = user_id WHERE users.id = ? AND badge_code = ? LIMIT 1")) {
-                        statement.setInt(1, json.user_id);
+                    try (PreparedStatement statement = connection.prepareStatement("SELECT COUNT(slot_id) FROM users_badges WHERE user_id = ? AND badge_code = ? LIMIT 1")) {
+                        statement.setInt(1, habboInfo.getId());
                         statement.setString(2, badgeCode);
                         try (ResultSet set = statement.executeQuery()) {
                             if (set.next()){
@@ -74,8 +83,8 @@ public class GiveBadge extends RCONMessage<GiveBadge.GiveBadgeJSON> {
                         this.status = RCONMessage.STATUS_ERROR;
                         this.message += Emulator.getTexts().getValue("commands.error.cmd_badge.already_owns").replace("%user%", username).replace("%badge%", badgeCode) + "\r";
                     } else {
-                        try (PreparedStatement statement = connection.prepareStatement("INSERT INTO users_badges VALUES (null, (SELECT id FROM users WHERE users.id = ? LIMIT 1), 0, ?)", Statement.RETURN_GENERATED_KEYS)) {
-                            statement.setInt(1, json.user_id);
+                        try (PreparedStatement statement = connection.prepareStatement("INSERT INTO users_badges (`id`, `user_id`, `slot_id`, `badge_code`) VALUES (null, ?, 0, ?)", Statement.RETURN_GENERATED_KEYS)) {
+                            statement.setInt(1, habboInfo.getId());
                             statement.setString(2, badgeCode);
                             statement.execute();
                         }

Emulator/src/test/java/com/eu/habbo/messages/rcon/GiveBadgeContractTest.java

@@ -0,0 +1,27 @@
+package com.eu.habbo.messages.rcon;
+
+import org.junit.jupiter.api.Test;
+
+import java.nio.file.Files;
+import java.nio.file.Path;
+
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+class GiveBadgeContractTest {
+    private static String giveBadgeSource() throws Exception {
+        return Files.readString(Path.of("src/main/java/com/eu/habbo/messages/rcon/GiveBadge.java"));
+    }
+
+    @Test
+    void offlineBadgeGrantRequiresExistingUserBeforeInsert() throws Exception {
+        String source = giveBadgeSource();
+
+        assertTrue(source.contains("HabboManager.getOfflineHabboInfo(json.user_id)"),
+                "Offline RCON badge grants must verify the target user exists");
+        assertTrue(source.contains("RCONMessage.HABBO_NOT_FOUND"),
+                "Offline RCON badge grants must report missing users");
+        assertFalse(source.contains("(SELECT id FROM users WHERE users.id = ? LIMIT 1)"),
+                "Offline RCON badge grants must not insert through a nullable user subquery");
+    }
+}