Preserves NPObject identity for objects created in a plugin and passed to JavaScript.

webkit/plugins/npapi/test/plugin_npobject_identity_test.cc

+// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "base/basictypes.h"
+#include "base/compiler_specific.h"
+
+#include "webkit/plugins/npapi/test/plugin_npobject_identity_test.h"
+
+namespace {
+
+class NPThingy : public NPObject {
+ public:
+  NPThingy() : NPObject() {}
+
+  static NPObject* Allocate(NPP npp, NPClass* npclass) {
+    return new NPThingy();
+  }
+
+  static void Deallocate(NPObject* npobject) {
+    delete static_cast<NPThingy*>(npobject);
+  }
+};
+
+NPClass* GetNPThingyClass() {
+  static NPClass plugin_class = {
+    NP_CLASS_STRUCT_VERSION,
+    NPThingy::Allocate,
+    NPThingy::Deallocate,
+    NULL, // Invalidate
+    NULL, // HasMethod
+    NULL, // Invoke
+    NULL, // InvokeDefault
+    NULL, // HasProperty
+    NULL, // GetProperty
+    NULL, // SetProperty
+    NULL, // RemoveProperty
+  };
+  return &plugin_class;
+}
+
+
+}  // namespace
+
+namespace NPAPIClient {
+
+NPObjectIdentityTest::NPObjectIdentityTest(NPP id,
+                                           NPNetscapeFuncs *host_functions)
+    : PluginTest(id, host_functions) {
+}
+
+NPError NPObjectIdentityTest::SetWindow(NPWindow* pNPWindow) {
+  if (pNPWindow->window == NULL)
+    return NPERR_NO_ERROR;
+
+  NPIdentifier are_these_the_same_id = HostFunctions()->getstringidentifier(
+      "areTheseTheSame");
+
+  // Get a function from window.areTheseTheSame.
+  NPObject* window;
+  HostFunctions()->getvalue(id(), NPNVWindowNPObject, &window);
+  NPVariant func_var;
+  HostFunctions()->getproperty(id(), window, are_these_the_same_id, &func_var);
+  NPObject* func = NPVARIANT_TO_OBJECT(func_var);
+
+  // Create a custom NPObject and pass it in both arguments to areTheseTheSame.
+  NPObject* thingy = HostFunctions()->createobject(id(), GetNPThingyClass());
+  NPVariant func_args[2];
+  OBJECT_TO_NPVARIANT(thingy, func_args[0]);
+  OBJECT_TO_NPVARIANT(thingy, func_args[1]);
+  NPVariant were_the_same_var;
+  HostFunctions()->invokeDefault(id(), func, (const NPVariant*)&func_args, 2,
+                                 &were_the_same_var);
+
+  // Confirm that JavaScript could see that the objects were the same.
+  bool were_the_same = NPVARIANT_TO_BOOLEAN(were_the_same_var);
+  if (!were_the_same)
+    SetError("Identity was lost in passing from NPAPI into JavaScript.");
+
+  // If this test failed, then we'd have crashed by now.
+  SignalTestCompleted();
+
+  return NPERR_NO_ERROR;
+}
+
+} // namespace NPAPIClient