caps/SystemPrincipal.cpp

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* This Source Code Form is subject to the terms of the Mozilla Public
   3  * License, v. 2.0. If a copy of the MPL was not distributed with this
   4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   5
   6 /* The privileged system principal. */
   7
   8 #include "nscore.h"
   9 #include "SystemPrincipal.h"
  10 #include "nsCOMPtr.h"
  11 #include "nsReadableUtils.h"
  12 #include "nsCRT.h"
  13 #include "nsString.h"
  14 #include "nsIClassInfoImpl.h"
  15 #include "pratom.h"
  16
  17 using namespace mozilla;
  18
  19 NS_IMPL_CLASSINFO(SystemPrincipal, nullptr,
  20                   nsIClassInfo::SINGLETON | nsIClassInfo::MAIN_THREAD_ONLY,
  21                   NS_SYSTEMPRINCIPAL_CID)
  22 NS_IMPL_QUERY_INTERFACE_CI(SystemPrincipal, nsIPrincipal, nsISerializable)
  23 NS_IMPL_CI_INTERFACE_GETTER(SystemPrincipal, nsIPrincipal, nsISerializable)
  24
  25 #define SYSTEM_PRINCIPAL_SPEC "[System Principal]"
  26
  27 already_AddRefed<SystemPrincipal> SystemPrincipal::Create() {
  28   RefPtr<SystemPrincipal> sp = new SystemPrincipal();
  29   sp->FinishInit(nsLiteralCString(SYSTEM_PRINCIPAL_SPEC), OriginAttributes());
  30   return sp.forget();
  31 }
  32
  33 nsresult SystemPrincipal::GetScriptLocation(nsACString& aStr) {
  34   aStr.AssignLiteral(SYSTEM_PRINCIPAL_SPEC);
  35   return NS_OK;
  36 }
  37
  38 ///////////////////////////////////////
  39 // Methods implementing nsIPrincipal //
  40 ///////////////////////////////////////
  41
  42 uint32_t SystemPrincipal::GetHashValue() { return NS_PTR_TO_INT32(this); }
  43
  44 NS_IMETHODIMP
  45 SystemPrincipal::GetURI(nsIURI** aURI) {
  46   *aURI = nullptr;
  47   return NS_OK;
  48 }
  49
  50 NS_IMETHODIMP
  51 SystemPrincipal::GetIsOriginPotentiallyTrustworthy(bool* aResult) {
  52   *aResult = true;
  53   return NS_OK;
  54 }
  55
  56 NS_IMETHODIMP
  57 SystemPrincipal::GetDomain(nsIURI** aDomain) {
  58   *aDomain = nullptr;
  59   return NS_OK;
  60 }
  61
  62 NS_IMETHODIMP
  63 SystemPrincipal::SetDomain(nsIURI* aDomain) { return NS_OK; }
  64
  65 NS_IMETHODIMP
  66 SystemPrincipal::GetBaseDomain(nsACString& aBaseDomain) {
  67   // No base domain for chrome.
  68   return NS_OK;
  69 }
  70
  71 NS_IMETHODIMP
  72 SystemPrincipal::GetAddonId(nsAString& aAddonId) {
  73   aAddonId.Truncate();
  74   return NS_OK;
  75 };
  76
  77 //////////////////////////////////////////
  78 // Methods implementing nsISerializable //
  79 //////////////////////////////////////////
  80
  81 NS_IMETHODIMP
  82 SystemPrincipal::Read(nsIObjectInputStream* aStream) {
  83   // no-op: CID is sufficient to identify the mSystemPrincipal singleton
  84   return NS_OK;
  85 }
  86
  87 NS_IMETHODIMP
  88 SystemPrincipal::Write(nsIObjectOutputStream* aStream) {
  89   // Read is used still for legacy principals
  90   MOZ_RELEASE_ASSERT(false, "Old style serialization is removed");
  91   return NS_OK;
  92 }