1 files changed, 50 insertions, 0 deletions
diff --git a/dom/security/trusted-types/TrustedTypePolicyFactory.cpp b/dom/security/trusted-types/TrustedTypePolicyFactory.cpp
new file mode 100644
index 0000000000..448c51eb3b
--- /dev/null
+++ b/dom/security/trusted-types/TrustedTypePolicyFactory.cpp
@@ -0,0 +1,50 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "mozilla/dom/TrustedTypePolicyFactory.h"
+
+#include "mozilla/AlreadyAddRefed.h"
+#include "mozilla/RefPtr.h"
+#include "mozilla/dom/TrustedTypePolicy.h"
+
+namespace mozilla::dom {
+
+NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE(TrustedTypePolicyFactory, mGlobalObject)
+
+JSObject* TrustedTypePolicyFactory::WrapObject(
+    JSContext* aCx, JS::Handle<JSObject*> aGivenProto) {
+  return TrustedTypePolicyFactory_Binding::Wrap(aCx, this, aGivenProto);
+}
+
+already_AddRefed<TrustedTypePolicy> TrustedTypePolicyFactory::CreatePolicy(
+    const nsAString& aPolicyName,
+    const TrustedTypePolicyOptions& aPolicyOptions) {
+  // TODO: implement the spec.
+  return MakeRefPtr<TrustedTypePolicy>(this).forget();
+}
+
+UniquePtr<TrustedHTML> TrustedTypePolicyFactory::EmptyHTML() {
+  // Preserving the wrapper ensures:
+  // ```
+  //  const e = trustedTypes.emptyHTML;
+  //  e === trustedTypes.emptyHTML;
+  // ```
+  // which comes with the cost of keeping the factory, one per global, alive.
+  // An additional benefit is it saves the cost of re-instantiating potentially
+  // multiple emptyHML objects. Both, the JS- and the C++-objects.
+  dom::PreserveWrapper(this);
+
+  return MakeUnique<TrustedHTML>();
+}
+
+UniquePtr<TrustedScript> TrustedTypePolicyFactory::EmptyScript() {
+  // See the explanation in `EmptyHTML()`.
+  dom::PreserveWrapper(this);
+
+  return MakeUnique<TrustedScript>();
+}
+
+}  // namespace mozilla::dom