caps/nsNullPrincipal.cpp
author Mike Hommey <mh+mozilla@glandium.org>
Fri, 15 Apr 2016 06:43:35 +0900
changeset 331180 334804a9afacc402b16c172a97bb85919510a8e8
parent 308255 0e4c4db3b90ff45937cc1eab4b7bbd61f4674326
child 334127 6b8afcb75d337366a6dd6d163adee7cc8385e66c
permissions -rw-r--r--
Bug 1257448 - Don't emit an error on unknown implied options when their resolved value is None. r=nalexander imply_option has no effect when the resolved value is None, so the same logic can be applied when checking for unknown implied options. This allows to imply options that may not always exist (because they are in a configure file that is optionally included). Ideally, it would be better not to do this, but until we have something better than optionally included configure files for --disable-compile-environment, this is a necessary evil.

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set sw=2 sts=2 ts=2 et 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/. */

/**
 * This is the principal that has no rights and can't be accessed by
 * anything other than itself and chrome; null principals are not
 * same-origin with anything but themselves.
 */

#include "mozilla/ArrayUtils.h"

#include "nsNullPrincipal.h"
#include "nsNullPrincipalURI.h"
#include "nsMemory.h"
#include "nsIURIWithPrincipal.h"
#include "nsIClassInfoImpl.h"
#include "nsNetCID.h"
#include "nsError.h"
#include "nsIScriptSecurityManager.h"
#include "nsPrincipal.h"
#include "nsScriptSecurityManager.h"
#include "pratom.h"

using namespace mozilla;

NS_IMPL_CLASSINFO(nsNullPrincipal, nullptr, nsIClassInfo::MAIN_THREAD_ONLY,
                  NS_NULLPRINCIPAL_CID)
NS_IMPL_QUERY_INTERFACE_CI(nsNullPrincipal,
                           nsIPrincipal,
                           nsISerializable)
NS_IMPL_CI_INTERFACE_GETTER(nsNullPrincipal,
                            nsIPrincipal,
                            nsISerializable)

/* static */ already_AddRefed<nsNullPrincipal>
nsNullPrincipal::CreateWithInheritedAttributes(nsIPrincipal* aInheritFrom)
{
  RefPtr<nsNullPrincipal> nullPrin = new nsNullPrincipal();
  nsresult rv = nullPrin->Init(Cast(aInheritFrom)->OriginAttributesRef());
  return NS_SUCCEEDED(rv) ? nullPrin.forget() : nullptr;
}

/* static */ already_AddRefed<nsNullPrincipal>
nsNullPrincipal::Create(const PrincipalOriginAttributes& aOriginAttributes)
{
  RefPtr<nsNullPrincipal> nullPrin = new nsNullPrincipal();
  nsresult rv = nullPrin->Init(aOriginAttributes);
  NS_ENSURE_SUCCESS(rv, nullptr);

  return nullPrin.forget();
}

nsresult
nsNullPrincipal::Init(const PrincipalOriginAttributes& aOriginAttributes)
{
  mOriginAttributes = aOriginAttributes;

  mURI = nsNullPrincipalURI::Create();
  NS_ENSURE_TRUE(mURI, NS_ERROR_NOT_AVAILABLE);

  return NS_OK;
}

void
nsNullPrincipal::GetScriptLocation(nsACString &aStr)
{
  mURI->GetSpec(aStr);
}

/**
 * nsIPrincipal implementation
 */

NS_IMETHODIMP
nsNullPrincipal::GetHashValue(uint32_t *aResult)
{
  *aResult = (NS_PTR_TO_INT32(this) >> 2);
  return NS_OK;
}

NS_IMETHODIMP
nsNullPrincipal::GetURI(nsIURI** aURI)
{
  return NS_EnsureSafeToReturn(mURI, aURI);
}

NS_IMETHODIMP
nsNullPrincipal::GetDomain(nsIURI** aDomain)
{
  return NS_EnsureSafeToReturn(mURI, aDomain);
}

NS_IMETHODIMP
nsNullPrincipal::SetDomain(nsIURI* aDomain)
{
  // I think the right thing to do here is to just throw...  Silently failing
  // seems counterproductive.
  return NS_ERROR_NOT_AVAILABLE;
}

nsresult
nsNullPrincipal::GetOriginInternal(nsACString& aOrigin)
{
  return mURI->GetSpec(aOrigin);
}

bool
nsNullPrincipal::MayLoadInternal(nsIURI* aURI)
{
  // Also allow the load if we are the principal of the URI being checked.
  nsCOMPtr<nsIURIWithPrincipal> uriPrinc = do_QueryInterface(aURI);
  if (uriPrinc) {
    nsCOMPtr<nsIPrincipal> principal;
    uriPrinc->GetPrincipal(getter_AddRefs(principal));

    if (principal == this) {
      return true;
    }
  }

  return false;
}

NS_IMETHODIMP
nsNullPrincipal::GetBaseDomain(nsACString& aBaseDomain)
{
  // For a null principal, we use our unique uuid as the base domain.
  return mURI->GetPath(aBaseDomain);
}

/**
 * nsISerializable implementation
 */
NS_IMETHODIMP
nsNullPrincipal::Read(nsIObjectInputStream* aStream)
{
  // Note - nsNullPrincipal use NS_GENERIC_FACTORY_CONSTRUCTOR_INIT, which means
  // that the Init() method has already been invoked by the time we deserialize.
  // This is in contrast to nsPrincipal, which uses NS_GENERIC_FACTORY_CONSTRUCTOR,
  // in which case ::Read needs to invoke Init().
  nsAutoCString suffix;
  nsresult rv = aStream->ReadCString(suffix);
  NS_ENSURE_SUCCESS(rv, rv);

  bool ok = mOriginAttributes.PopulateFromSuffix(suffix);
  NS_ENSURE_TRUE(ok, NS_ERROR_FAILURE);

  return NS_OK;
}

NS_IMETHODIMP
nsNullPrincipal::Write(nsIObjectOutputStream* aStream)
{
  nsAutoCString suffix;
  OriginAttributesRef().CreateSuffix(suffix);

  nsresult rv = aStream->WriteStringZ(suffix.get());
  NS_ENSURE_SUCCESS(rv, rv);

  return NS_OK;
}