1 files changed, 119 insertions, 0 deletions
diff --git a/caps/SystemPrincipal.cpp b/caps/SystemPrincipal.cpp
new file mode 100644
index 0000000000..f92b5cc6b4
--- /dev/null
+++ b/caps/SystemPrincipal.cpp
@@ -0,0 +1,119 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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/. */
+
+/* The privileged system principal. */
+
+#include "nscore.h"
+#include "SystemPrincipal.h"
+#include "mozilla/ClearOnShutdown.h"
+#include "nsCOMPtr.h"
+#include "nsReadableUtils.h"
+#include "nsCRT.h"
+#include "nsString.h"
+#include "nsIClassInfoImpl.h"
+#include "pratom.h"
+
+using namespace mozilla;
+
+NS_IMPL_CLASSINFO(SystemPrincipal, nullptr,
+                  nsIClassInfo::SINGLETON | nsIClassInfo::MAIN_THREAD_ONLY,
+                  NS_SYSTEMPRINCIPAL_CID)
+NS_IMPL_QUERY_INTERFACE_CI(SystemPrincipal, nsIPrincipal, nsISerializable)
+NS_IMPL_CI_INTERFACE_GETTER(SystemPrincipal, nsIPrincipal, nsISerializable)
+
+static constexpr nsLiteralCString kSystemPrincipalSpec =
+    "[System Principal]"_ns;
+
+SystemPrincipal::SystemPrincipal()
+    : BasePrincipal(eSystemPrincipal, kSystemPrincipalSpec,
+                    OriginAttributes()) {}
+
+static StaticMutex sSystemPrincipalMutex;
+static StaticRefPtr<SystemPrincipal> sSystemPrincipal
+    MOZ_GUARDED_BY(sSystemPrincipalMutex);
+
+already_AddRefed<SystemPrincipal> SystemPrincipal::Get() {
+  StaticMutexAutoLock lock(sSystemPrincipalMutex);
+  return do_AddRef(sSystemPrincipal);
+}
+
+already_AddRefed<SystemPrincipal> SystemPrincipal::Init() {
+  AssertIsOnMainThread();
+  StaticMutexAutoLock lock(sSystemPrincipalMutex);
+  if (MOZ_UNLIKELY(sSystemPrincipal)) {
+    MOZ_ASSERT_UNREACHABLE("SystemPrincipal::Init() may only be called once");
+  } else {
+    sSystemPrincipal = new SystemPrincipal();
+  }
+  return do_AddRef(sSystemPrincipal);
+}
+
+void SystemPrincipal::Shutdown() {
+  AssertIsOnMainThread();
+  StaticMutexAutoLock lock(sSystemPrincipalMutex);
+  MOZ_ASSERT(sSystemPrincipal);
+  sSystemPrincipal = nullptr;
+}
+
+nsresult SystemPrincipal::GetScriptLocation(nsACString& aStr) {
+  aStr.Assign(kSystemPrincipalSpec);
+  return NS_OK;
+}
+
+///////////////////////////////////////
+// Methods implementing nsIPrincipal //
+///////////////////////////////////////
+
+uint32_t SystemPrincipal::GetHashValue() { return NS_PTR_TO_INT32(this); }
+
+NS_IMETHODIMP
+SystemPrincipal::GetURI(nsIURI** aURI) {
+  *aURI = nullptr;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+SystemPrincipal::GetIsOriginPotentiallyTrustworthy(bool* aResult) {
+  *aResult = true;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+SystemPrincipal::GetDomain(nsIURI** aDomain) {
+  *aDomain = nullptr;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+SystemPrincipal::SetDomain(nsIURI* aDomain) { return NS_OK; }
+
+NS_IMETHODIMP
+SystemPrincipal::GetBaseDomain(nsACString& aBaseDomain) {
+  // No base domain for chrome.
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+SystemPrincipal::GetAddonId(nsAString& aAddonId) {
+  aAddonId.Truncate();
+  return NS_OK;
+};
+
+//////////////////////////////////////////
+// Methods implementing nsISerializable //
+//////////////////////////////////////////
+
+NS_IMETHODIMP
+SystemPrincipal::Read(nsIObjectInputStream* aStream) {
+  // no-op: CID is sufficient to identify the mSystemPrincipal singleton
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+SystemPrincipal::Write(nsIObjectOutputStream* aStream) {
+  // Read is used still for legacy principals
+  MOZ_RELEASE_ASSERT(false, "Old style serialization is removed");
+  return NS_OK;
+}