feat: update LicensingFacade

src/main/java/com/novitechie/LicensingFacadeTransformer.java

@@ -42,6 +42,8 @@ public class LicensingFacadeTransformer implements MyTransformer {
                     m.instructions.insert(list);
                 } else if ("toJson".equals(m.name) && "()Ljava/lang/String;".equals(m.desc)) {
                     insertToJsonFilterSecure(m);
+                } else if ("getInstance".equals(m.name) && "()Lcom/intellij/ui/LicensingFacade;".equals(m.desc)) {
+                    insertGetInstanceGuard(m);
                 }
             }
 
@@ -54,6 +56,31 @@ public class LicensingFacadeTransformer implements MyTransformer {
         }
     }
 
+    private void insertGetInstanceGuard(MethodNode m) {
+        if (m.instructions == null || m.instructions.size() == 0) {
+            return;
+        }
+        int storeIdx = m.maxLocals;
+        m.maxLocals += 1;
+
+        ListIterator<AbstractInsnNode> iterator = m.instructions.iterator();
+        while (iterator.hasNext()) {
+            AbstractInsnNode current = iterator.next();
+            if (current.getOpcode() == ARETURN) {
+                LabelNode returnOriginal = new LabelNode();
+                InsnList patch = new InsnList();
+                patch.add(new VarInsnNode(ASTORE, storeIdx));
+                patch.add(new MethodInsnNode(INVOKESTATIC, "com/novitechie/rules/StackTraceRule", "check", "()Z", false));
+                patch.add(new JumpInsnNode(IFEQ, returnOriginal));
+                patch.add(new InsnNode(ACONST_NULL));
+                patch.add(new InsnNode(ARETURN));
+                patch.add(returnOriginal);
+                patch.add(new VarInsnNode(ALOAD, storeIdx));
+                m.instructions.insertBefore(current, patch);
+            }
+        }
+    }
+
     private void insertToJsonFilterSecure(MethodNode m) {
         if (m.instructions == null || m.instructions.size() == 0) {
             return;