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 static constexpr nsLiteralCString kSystemPrincipalSpec =
  26     "[System Principal]"_ns;
  27
  28 SystemPrincipal::SystemPrincipal()
  29     : BasePrincipal(eSystemPrincipal, kSystemPrincipalSpec,
  30                     OriginAttributes()) {}
  31
  32 already_AddRefed<SystemPrincipal> SystemPrincipal::Create() {
  33   RefPtr<SystemPrincipal> sp = new SystemPrincipal();
  34   return sp.forget();
  35 }
  36
  37 nsresult SystemPrincipal::GetScriptLocation(nsACString& aStr) {
  38   aStr.Assign(kSystemPrincipalSpec);
  39   return NS_OK;
  40 }
  41
  42 ///////////////////////////////////////
  43 // Methods implementing nsIPrincipal //
  44 ///////////////////////////////////////
  45
  46 uint32_t SystemPrincipal::GetHashValue() { return NS_PTR_TO_INT32(this); }
  47
  48 NS_IMETHODIMP
  49 SystemPrincipal::GetURI(nsIURI** aURI) {
  50   *aURI = nullptr;
  51   return NS_OK;
  52 }
  53
  54 NS_IMETHODIMP
  55 SystemPrincipal::GetIsOriginPotentiallyTrustworthy(bool* aResult) {
  56   *aResult = true;
  57   return NS_OK;
  58 }
  59
  60 NS_IMETHODIMP
  61 SystemPrincipal::GetDomain(nsIURI** aDomain) {
  62   *aDomain = nullptr;
  63   return NS_OK;
  64 }
  65
  66 NS_IMETHODIMP
  67 SystemPrincipal::SetDomain(nsIURI* aDomain) { return NS_OK; }
  68
  69 NS_IMETHODIMP
  70 SystemPrincipal::GetBaseDomain(nsACString& aBaseDomain) {
  71   // No base domain for chrome.
  72   return NS_OK;
  73 }
  74
  75 NS_IMETHODIMP
  76 SystemPrincipal::GetAddonId(nsAString& aAddonId) {
  77   aAddonId.Truncate();
  78   return NS_OK;
  79 };
  80
  81 //////////////////////////////////////////
  82 // Methods implementing nsISerializable //
  83 //////////////////////////////////////////
  84
  85 NS_IMETHODIMP
  86 SystemPrincipal::Read(nsIObjectInputStream* aStream) {
  87   // no-op: CID is sufficient to identify the mSystemPrincipal singleton
  88   return NS_OK;
  89 }
  90
  91 NS_IMETHODIMP
  92 SystemPrincipal::Write(nsIObjectOutputStream* aStream) {
  93   // Read is used still for legacy principals
  94   MOZ_RELEASE_ASSERT(false, "Old style serialization is removed");
  95   return NS_OK;
  96 }