/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */

/* 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 "nsIComponentManager.h"

#include "nsIServiceManager.h"

#include "nsIURL.h"

#include "nsCOMPtr.h"

#include "nsReadableUtils.h"

#include "nsCRT.h"

#include "nsString.h"

#include "nsIClassInfoImpl.h"

#include "nsIScriptSecurityManager.h"

#include "pratom.h"

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)

#define SYSTEM_PRINCIPAL_SPEC "[System Principal]"

already_AddRefed<SystemPrincipal> SystemPrincipal::Create() {

  RefPtr<SystemPrincipal> sp = new SystemPrincipal();

  sp->FinishInit(NS_LITERAL_CSTRING(SYSTEM_PRINCIPAL_SPEC), OriginAttributes());

  return sp.forget();

}

nsresult SystemPrincipal::GetScriptLocation(nsACString& aStr) {

  aStr.AssignLiteral(SYSTEM_PRINCIPAL_SPEC);

  return NS_OK;

}

///////////////////////////////////////

// Methods implementing nsIPrincipal //

///////////////////////////////////////

NS_IMETHODIMP

SystemPrincipal::GetHashValue(uint32_t* result) {

  *result = NS_PTR_TO_INT32(this);

  return NS_OK;

}

NS_IMETHODIMP

SystemPrincipal::GetURI(nsIURI** aURI) {

  *aURI = nullptr;

  return NS_OK;

}

NS_IMETHODIMP

SystemPrincipal::GetCsp(nsIContentSecurityPolicy** aCsp) {

  *aCsp = nullptr;

  return NS_OK;

}

NS_IMETHODIMP

SystemPrincipal::SetCsp(nsIContentSecurityPolicy* aCsp) {

  // Never destroy an existing CSP on the principal.

  // This method should only be called in rare cases.

  return NS_ERROR_FAILURE;

}

NS_IMETHODIMP

SystemPrincipal::EnsureCSP(nsIDOMDocument* aDocument,

                           nsIContentSecurityPolicy** aCSP) {

  // CSP on a system principal makes no sense

  return NS_ERROR_FAILURE;

}

NS_IMETHODIMP

SystemPrincipal::GetPreloadCsp(nsIContentSecurityPolicy** aPreloadCSP) {

  *aPreloadCSP = nullptr;

  return NS_OK;

}

NS_IMETHODIMP

SystemPrincipal::EnsurePreloadCSP(nsIDOMDocument* aDocument,

                                  nsIContentSecurityPolicy** aPreloadCSP) {

  // CSP on a system principal makes no sense

  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) {

  // no-op: CID is sufficient to identify the mSystemPrincipal singleton

  return NS_OK;

}