1 files changed, 51 insertions, 0 deletions
diff --git a/dom/ipc/PermissionMessageUtils.cpp b/dom/ipc/PermissionMessageUtils.cpp
new file mode 100644
index 0000000000..19d232a7bc
--- /dev/null
+++ b/dom/ipc/PermissionMessageUtils.cpp
@@ -0,0 +1,51 @@
+/* -*- 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/PermissionMessageUtils.h"
+#include "mozilla/ipc/BackgroundUtils.h"
+#include "mozilla/ipc/PBackgroundSharedTypes.h"
+#include "nsCOMPtr.h"
+#include "nsIPrincipal.h"
+
+namespace mozilla::ipc {
+
+void IPDLParamTraits<nsIPrincipal*>::Write(IPC::MessageWriter* aWriter,
+                                           IProtocol* aActor,
+                                           nsIPrincipal* aParam) {
+  Maybe<PrincipalInfo> info;
+  if (aParam) {
+    info.emplace();
+    nsresult rv = PrincipalToPrincipalInfo(aParam, info.ptr());
+    MOZ_RELEASE_ASSERT(NS_SUCCEEDED(rv));
+  }
+
+  WriteIPDLParam(aWriter, aActor, info);
+}
+
+bool IPDLParamTraits<nsIPrincipal*>::Read(IPC::MessageReader* aReader,
+                                          IProtocol* aActor,
+                                          RefPtr<nsIPrincipal>* aResult) {
+  Maybe<PrincipalInfo> info;
+  if (!ReadIPDLParam(aReader, aActor, &info)) {
+    return false;
+  }
+
+  if (info.isNothing()) {
+    return true;
+  }
+
+  auto principalOrErr = PrincipalInfoToPrincipal(info.ref());
+
+  if (NS_WARN_IF(principalOrErr.isErr())) {
+    return false;
+  }
+
+  nsCOMPtr<nsIPrincipal> principal = principalOrErr.unwrap();
+  *aResult = principal;
+  return true;
+}
+
+}  // namespace mozilla::ipc