gecko-dev/dom/storage/DOMStorage.cpp

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/* -*- Mode: C++; tab-width: 2; 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/. */
#include "DOMStorage.h"
#include "DOMStorageCache.h"
#include "DOMStorageManager.h"
#include "nsIObserverService.h"
#include "nsIScriptSecurityManager.h"
#include "nsIPermissionManager.h"
#include "nsIPrincipal.h"
#include "nsICookiePermission.h"
#include "mozilla/dom/StorageBinding.h"
#include "mozilla/dom/StorageEvent.h"
#include "mozilla/dom/StorageEventBinding.h"
#include "mozilla/Services.h"
#include "mozilla/Preferences.h"
#include "nsThreadUtils.h"
#include "nsContentUtils.h"
#include "nsServiceManagerUtils.h"
namespace mozilla {
namespace dom {
NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE(DOMStorage, mManager, mPrincipal, mWindow)
NS_IMPL_CYCLE_COLLECTING_ADDREF(DOMStorage)
NS_IMPL_CYCLE_COLLECTING_RELEASE(DOMStorage)
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(DOMStorage)
NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIDOMStorage)
NS_INTERFACE_MAP_ENTRY(nsIDOMStorage)
NS_INTERFACE_MAP_ENTRY(nsISupportsWeakReference)
NS_INTERFACE_MAP_END
DOMStorage::DOMStorage(nsIDOMWindow* aWindow,
DOMStorageManager* aManager,
DOMStorageCache* aCache,
const nsAString& aDocumentURI,
nsIPrincipal* aPrincipal,
bool aIsPrivate)
: mWindow(aWindow)
, mManager(aManager)
, mCache(aCache)
, mDocumentURI(aDocumentURI)
, mPrincipal(aPrincipal)
, mIsPrivate(aIsPrivate)
, mIsSessionOnly(false)
{
mCache->Preload();
}
DOMStorage::~DOMStorage()
{
mCache->KeepAlive();
}
/* virtual */ JSObject*
DOMStorage::WrapObject(JSContext* aCx)
{
return StorageBinding::Wrap(aCx, this);
}
uint32_t
DOMStorage::GetLength(ErrorResult& aRv)
{
if (!CanUseStorage(this)) {
aRv.Throw(NS_ERROR_DOM_SECURITY_ERR);
return 0;
}
uint32_t length;
aRv = mCache->GetLength(this, &length);
return length;
}
void
DOMStorage::Key(uint32_t aIndex, nsAString& aResult, ErrorResult& aRv)
{
if (!CanUseStorage(this)) {
aRv.Throw(NS_ERROR_DOM_SECURITY_ERR);
return;
}
aRv = mCache->GetKey(this, aIndex, aResult);
}
void
DOMStorage::GetItem(const nsAString& aKey, nsAString& aResult, ErrorResult& aRv)
{
if (!CanUseStorage(this)) {
aRv.Throw(NS_ERROR_DOM_SECURITY_ERR);
return;
}
aRv = mCache->GetItem(this, aKey, aResult);
}
void
DOMStorage::SetItem(const nsAString& aKey, const nsAString& aData,
ErrorResult& aRv)
{
if (!CanUseStorage(this)) {
aRv.Throw(NS_ERROR_DOM_SECURITY_ERR);
return;
}
Telemetry::Accumulate(GetType() == LocalStorage
? Telemetry::LOCALDOMSTORAGE_KEY_SIZE_BYTES
: Telemetry::SESSIONDOMSTORAGE_KEY_SIZE_BYTES, aKey.Length());
Telemetry::Accumulate(GetType() == LocalStorage
? Telemetry::LOCALDOMSTORAGE_VALUE_SIZE_BYTES
: Telemetry::SESSIONDOMSTORAGE_VALUE_SIZE_BYTES, aData.Length());
nsString data;
bool ok = data.Assign(aData, fallible);
if (!ok) {
aRv.Throw(NS_ERROR_OUT_OF_MEMORY);
return;
}
nsString old;
aRv = mCache->SetItem(this, aKey, data, old);
if (aRv.Failed()) {
return;
}
if (aRv.ErrorCode() != NS_SUCCESS_DOM_NO_OPERATION) {
BroadcastChangeNotification(aKey, old, aData);
}
}
void
DOMStorage::RemoveItem(const nsAString& aKey, ErrorResult& aRv)
{
if (!CanUseStorage(this)) {
aRv.Throw(NS_ERROR_DOM_SECURITY_ERR);
return;
}
nsAutoString old;
aRv = mCache->RemoveItem(this, aKey, old);
if (aRv.Failed()) {
return;
}
if (aRv.ErrorCode() != NS_SUCCESS_DOM_NO_OPERATION) {
BroadcastChangeNotification(aKey, old, NullString());
}
}
void
DOMStorage::Clear(ErrorResult& aRv)
{
if (!CanUseStorage(this)) {
aRv.Throw(NS_ERROR_DOM_SECURITY_ERR);
return;
}
aRv = mCache->Clear(this);
if (NS_WARN_IF(aRv.Failed())) {
return;
}
if (aRv.ErrorCode() != NS_SUCCESS_DOM_NO_OPERATION) {
BroadcastChangeNotification(NullString(), NullString(), NullString());
}
}
namespace {
class StorageNotifierRunnable : public nsRunnable
{
public:
StorageNotifierRunnable(nsISupports* aSubject, const char16_t* aType)
: mSubject(aSubject), mType(aType)
{ }
NS_DECL_NSIRUNNABLE
private:
nsCOMPtr<nsISupports> mSubject;
const char16_t* mType;
};
NS_IMETHODIMP
StorageNotifierRunnable::Run()
{
nsCOMPtr<nsIObserverService> observerService =
mozilla::services::GetObserverService();
if (observerService) {
observerService->NotifyObservers(mSubject, "dom-storage2-changed", mType);
}
return NS_OK;
}
} // anonymous namespace
void
DOMStorage::BroadcastChangeNotification(const nsSubstring& aKey,
const nsSubstring& aOldValue,
const nsSubstring& aNewValue)
{
StorageEventInit dict;
dict.mBubbles = false;
dict.mCancelable = false;
dict.mKey = aKey;
dict.mNewValue = aNewValue;
dict.mOldValue = aOldValue;
dict.mStorageArea = this;
dict.mUrl = mDocumentURI;
// Note, this DOM event should never reach JS. It is cloned later in
// nsGlobalWindow.
nsRefPtr<StorageEvent> event =
StorageEvent::Constructor(nullptr, NS_LITERAL_STRING("storage"), dict);
nsRefPtr<StorageNotifierRunnable> r =
new StorageNotifierRunnable(event,
GetType() == LocalStorage
? MOZ_UTF16("localStorage")
: MOZ_UTF16("sessionStorage"));
NS_DispatchToMainThread(r);
}
static const uint32_t ASK_BEFORE_ACCEPT = 1;
static const uint32_t ACCEPT_SESSION = 2;
static const uint32_t BEHAVIOR_REJECT = 2;
static const char kPermissionType[] = "cookie";
static const char kStorageEnabled[] = "dom.storage.enabled";
static const char kCookiesBehavior[] = "network.cookie.cookieBehavior";
static const char kCookiesLifetimePolicy[] = "network.cookie.lifetimePolicy";
// static, public
bool
DOMStorage::CanUseStorage(DOMStorage* aStorage)
{
// This method is responsible for correct setting of mIsSessionOnly.
// It doesn't work with mIsPrivate flag at all, since it is checked
// regardless mIsSessionOnly flag in DOMStorageCache code.
if (aStorage) {
aStorage->mIsSessionOnly = false;
}
if (!mozilla::Preferences::GetBool(kStorageEnabled)) {
return false;
}
// chrome can always use aStorage regardless of permission preferences
nsCOMPtr<nsIPrincipal> subjectPrincipal =
nsContentUtils::SubjectPrincipal();
if (nsContentUtils::IsSystemPrincipal(subjectPrincipal)) {
return true;
}
nsCOMPtr<nsIPermissionManager> permissionManager =
services::GetPermissionManager();
if (!permissionManager) {
return false;
}
uint32_t perm;
permissionManager->TestPermissionFromPrincipal(subjectPrincipal,
kPermissionType, &perm);
if (perm == nsIPermissionManager::DENY_ACTION) {
return false;
}
if (perm == nsICookiePermission::ACCESS_SESSION) {
if (aStorage) {
aStorage->mIsSessionOnly = true;
}
} else if (perm != nsIPermissionManager::ALLOW_ACTION) {
uint32_t cookieBehavior = Preferences::GetUint(kCookiesBehavior);
uint32_t lifetimePolicy = Preferences::GetUint(kCookiesLifetimePolicy);
// Treat "ask every time" as "reject always".
if ((cookieBehavior == BEHAVIOR_REJECT || lifetimePolicy == ASK_BEFORE_ACCEPT)) {
return false;
}
if (lifetimePolicy == ACCEPT_SESSION && aStorage) {
aStorage->mIsSessionOnly = true;
}
}
if (aStorage) {
return aStorage->CanAccess(subjectPrincipal);
}
return true;
}
DOMStorage::StorageType
DOMStorage::GetType() const
{
return mManager->Type();
}
nsIPrincipal*
DOMStorage::GetPrincipal()
{
return mPrincipal;
}
// Defined in DOMStorageManager.cpp
extern bool
PrincipalsEqual(nsIPrincipal* aObjectPrincipal, nsIPrincipal* aSubjectPrincipal);
bool
DOMStorage::PrincipalEquals(nsIPrincipal* aPrincipal)
{
return PrincipalsEqual(mPrincipal, aPrincipal);
}
bool
DOMStorage::CanAccess(nsIPrincipal* aPrincipal)
{
return !aPrincipal || aPrincipal->Subsumes(mPrincipal);
}
void
DOMStorage::GetSupportedNames(unsigned, nsTArray<nsString>& aKeys)
{
if (!CanUseStorage(this)) {
// return just an empty array
aKeys.Clear();
return;
}
mCache->GetKeys(this, aKeys);
}
} // ::dom
} // ::mozilla