gecko-dev/dom/storage/LocalStorageManager.cpp

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C++

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 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/. */
#include "LocalStorageManager.h"
#include "LocalStorage.h"
#include "StorageDBThread.h"
#include "StorageUtils.h"
#include "nsIScriptSecurityManager.h"
#include "nsIEffectiveTLDService.h"
#include "nsNetUtil.h"
#include "nsNetCID.h"
#include "nsIURL.h"
#include "nsPrintfCString.h"
#include "nsXULAppAPI.h"
#include "nsThreadUtils.h"
#include "nsIObserverService.h"
#include "mozilla/Services.h"
#include "mozilla/Preferences.h"
// Only allow relatively small amounts of data since performance of
// the synchronous IO is very bad.
// We are enforcing simple per-origin quota only.
#define DEFAULT_QUOTA_LIMIT (5 * 1024)
namespace mozilla {
namespace dom {
using namespace StorageUtils;
namespace {
int32_t gQuotaLimit = DEFAULT_QUOTA_LIMIT;
} // namespace
LocalStorageManager* LocalStorageManager::sSelf = nullptr;
// static
uint32_t
LocalStorageManager::GetQuota()
{
static bool preferencesInitialized = false;
if (!preferencesInitialized) {
mozilla::Preferences::AddIntVarCache(&gQuotaLimit,
"dom.storage.default_quota",
DEFAULT_QUOTA_LIMIT);
preferencesInitialized = true;
}
return gQuotaLimit * 1024; // pref is in kBs
}
NS_IMPL_ISUPPORTS(LocalStorageManager,
nsIDOMStorageManager)
LocalStorageManager::LocalStorageManager()
: mCaches(8)
, mLowDiskSpace(false)
{
StorageObserver* observer = StorageObserver::Self();
NS_ASSERTION(observer, "No StorageObserver, cannot observe private data delete notifications!");
if (observer) {
observer->AddSink(this);
}
NS_ASSERTION(!sSelf, "Somebody is trying to do_CreateInstance(\"@mozilla/dom/localStorage-manager;1\"");
sSelf = this;
if (!XRE_IsParentProcess()) {
// Do this only on the child process. The thread IPC bridge
// is also used to communicate chrome observer notifications.
// Note: must be called after we set sSelf
StorageDBChild::GetOrCreate();
}
}
LocalStorageManager::~LocalStorageManager()
{
StorageObserver* observer = StorageObserver::Self();
if (observer) {
observer->RemoveSink(this);
}
sSelf = nullptr;
}
namespace {
nsresult
CreateQuotaDBKey(nsIPrincipal* aPrincipal,
nsACString& aKey)
{
nsresult rv;
nsCOMPtr<nsIEffectiveTLDService> eTLDService(do_GetService(
NS_EFFECTIVETLDSERVICE_CONTRACTID, &rv));
NS_ENSURE_SUCCESS(rv, rv);
nsCOMPtr<nsIURI> uri;
rv = aPrincipal->GetURI(getter_AddRefs(uri));
NS_ENSURE_SUCCESS(rv, rv);
NS_ENSURE_TRUE(uri, NS_ERROR_UNEXPECTED);
nsAutoCString eTLDplusOne;
rv = eTLDService->GetBaseDomain(uri, 0, eTLDplusOne);
if (NS_ERROR_INSUFFICIENT_DOMAIN_LEVELS == rv) {
// XXX bug 357323 - what to do for localhost/file exactly?
rv = uri->GetAsciiHost(eTLDplusOne);
}
NS_ENSURE_SUCCESS(rv, rv);
aKey.Truncate();
aPrincipal->OriginAttributesRef().CreateSuffix(aKey);
nsAutoCString subdomainsDBKey;
CreateReversedDomain(eTLDplusOne, subdomainsDBKey);
aKey.Append(':');
aKey.Append(subdomainsDBKey);
return NS_OK;
}
} // namespace
// static
nsCString
LocalStorageManager::CreateOrigin(const nsACString& aOriginSuffix,
const nsACString& aOriginNoSuffix)
{
// Note: some hard-coded sqlite statements are dependent on the format this
// method returns. Changing this without updating those sqlite statements
// will cause malfunction.
nsAutoCString scope;
scope.Append(aOriginSuffix);
scope.Append(':');
scope.Append(aOriginNoSuffix);
return scope;
}
LocalStorageCache*
LocalStorageManager::GetCache(const nsACString& aOriginSuffix,
const nsACString& aOriginNoSuffix)
{
CacheOriginHashtable* table = mCaches.LookupOrAdd(aOriginSuffix);
LocalStorageCacheHashKey* entry = table->GetEntry(aOriginNoSuffix);
if (!entry) {
return nullptr;
}
return entry->cache();
}
already_AddRefed<StorageUsage>
LocalStorageManager::GetOriginUsage(const nsACString& aOriginNoSuffix)
{
RefPtr<StorageUsage> usage;
if (mUsages.Get(aOriginNoSuffix, &usage)) {
return usage.forget();
}
usage = new StorageUsage(aOriginNoSuffix);
StorageDBChild* storageChild = StorageDBChild::GetOrCreate();
if (storageChild) {
storageChild->AsyncGetUsage(usage);
}
mUsages.Put(aOriginNoSuffix, usage);
return usage.forget();
}
already_AddRefed<LocalStorageCache>
LocalStorageManager::PutCache(const nsACString& aOriginSuffix,
const nsACString& aOriginNoSuffix,
nsIPrincipal* aPrincipal)
{
CacheOriginHashtable* table = mCaches.LookupOrAdd(aOriginSuffix);
LocalStorageCacheHashKey* entry = table->PutEntry(aOriginNoSuffix);
RefPtr<LocalStorageCache> cache = entry->cache();
nsAutoCString quotaOrigin;
CreateQuotaDBKey(aPrincipal, quotaOrigin);
// Lifetime handled by the cache, do persist
cache->Init(this, true, aPrincipal, quotaOrigin);
return cache.forget();
}
void
LocalStorageManager::DropCache(LocalStorageCache* aCache)
{
if (!NS_IsMainThread()) {
NS_WARNING("StorageManager::DropCache called on a non-main thread, shutting down?");
}
CacheOriginHashtable* table = mCaches.LookupOrAdd(aCache->OriginSuffix());
table->RemoveEntry(aCache->OriginNoSuffix());
}
nsresult
LocalStorageManager::GetStorageInternal(CreateMode aCreateMode,
mozIDOMWindow* aWindow,
nsIPrincipal* aPrincipal,
const nsAString& aDocumentURI,
bool aPrivate,
nsIDOMStorage** aRetval)
{
nsAutoCString originAttrSuffix;
nsAutoCString originKey;
nsresult rv = GenerateOriginKey(aPrincipal, originAttrSuffix, originKey);
if (NS_FAILED(rv)) {
return NS_ERROR_NOT_AVAILABLE;
}
RefPtr<LocalStorageCache> cache = GetCache(originAttrSuffix, originKey);
// Get or create a cache for the given scope
if (!cache) {
if (aCreateMode == CreateMode::UseIfExistsNeverCreate) {
*aRetval = nullptr;
return NS_OK;
}
if (aCreateMode == CreateMode::CreateIfShouldPreload) {
// This is a demand to just preload the cache, if the scope has
// no data stored, bypass creation and preload of the cache.
StorageDBChild* db = StorageDBChild::Get();
if (db) {
if (!db->ShouldPreloadOrigin(LocalStorageManager::CreateOrigin(originAttrSuffix, originKey))) {
return NS_OK;
}
} else {
if (originKey.EqualsLiteral("knalb.:about")) {
return NS_OK;
}
}
}
// There is always a single instance of a cache per scope
// in a single instance of a DOM storage manager.
cache = PutCache(originAttrSuffix, originKey, aPrincipal);
}
if (aRetval) {
nsCOMPtr<nsPIDOMWindowInner> inner = nsPIDOMWindowInner::From(aWindow);
nsCOMPtr<nsIDOMStorage> storage = new LocalStorage(
inner, this, cache, aDocumentURI, aPrincipal, aPrivate);
storage.forget(aRetval);
}
return NS_OK;
}
NS_IMETHODIMP
LocalStorageManager::PrecacheStorage(nsIPrincipal* aPrincipal,
nsIDOMStorage** aRetval)
{
return GetStorageInternal(CreateMode::CreateIfShouldPreload, nullptr,
aPrincipal, EmptyString(), false, aRetval);
}
NS_IMETHODIMP
LocalStorageManager::CreateStorage(mozIDOMWindow* aWindow,
nsIPrincipal* aPrincipal,
const nsAString& aDocumentURI,
bool aPrivate,
nsIDOMStorage** aRetval)
{
return GetStorageInternal(CreateMode::CreateAlways, aWindow, aPrincipal,
aDocumentURI, aPrivate, aRetval);
}
NS_IMETHODIMP
LocalStorageManager::GetStorage(mozIDOMWindow* aWindow,
nsIPrincipal* aPrincipal,
bool aPrivate,
nsIDOMStorage** aRetval)
{
return GetStorageInternal(CreateMode::UseIfExistsNeverCreate, aWindow,
aPrincipal, EmptyString(), aPrivate, aRetval);
}
NS_IMETHODIMP
LocalStorageManager::CloneStorage(nsIDOMStorage* aStorage)
{
// Cloning is supported only for sessionStorage
return NS_ERROR_NOT_IMPLEMENTED;
}
NS_IMETHODIMP
LocalStorageManager::CheckStorage(nsIPrincipal* aPrincipal,
nsIDOMStorage* aStorage,
bool* aRetval)
{
nsresult rv;
RefPtr<LocalStorage> storage = static_cast<LocalStorage*>(aStorage);
if (!storage) {
return NS_ERROR_UNEXPECTED;
}
*aRetval = false;
if (!aPrincipal) {
return NS_ERROR_NOT_AVAILABLE;
}
nsAutoCString suffix;
nsAutoCString origin;
rv = GenerateOriginKey(aPrincipal, suffix, origin);
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
LocalStorageCache* cache = GetCache(suffix, origin);
if (cache != storage->GetCache()) {
return NS_OK;
}
if (!storage->PrincipalEquals(aPrincipal)) {
return NS_OK;
}
*aRetval = true;
return NS_OK;
}
void
LocalStorageManager::ClearCaches(uint32_t aUnloadFlags,
const OriginAttributesPattern& aPattern,
const nsACString& aOriginScope)
{
for (auto iter1 = mCaches.Iter(); !iter1.Done(); iter1.Next()) {
OriginAttributes oa;
DebugOnly<bool> rv = oa.PopulateFromSuffix(iter1.Key());
MOZ_ASSERT(rv);
if (!aPattern.Matches(oa)) {
// This table doesn't match the given origin attributes pattern
continue;
}
CacheOriginHashtable* table = iter1.Data();
for (auto iter2 = table->Iter(); !iter2.Done(); iter2.Next()) {
LocalStorageCache* cache = iter2.Get()->cache();
if (aOriginScope.IsEmpty() ||
StringBeginsWith(cache->OriginNoSuffix(), aOriginScope)) {
cache->UnloadItems(aUnloadFlags);
}
}
}
}
nsresult
LocalStorageManager::Observe(const char* aTopic,
const nsAString& aOriginAttributesPattern,
const nsACString& aOriginScope)
{
OriginAttributesPattern pattern;
if (!pattern.Init(aOriginAttributesPattern)) {
NS_ERROR("Cannot parse origin attributes pattern");
return NS_ERROR_FAILURE;
}
// Clear everything, caches + database
if (!strcmp(aTopic, "cookie-cleared")) {
ClearCaches(LocalStorageCache::kUnloadComplete, pattern, EmptyCString());
return NS_OK;
}
// Clear everything, caches + database
if (!strcmp(aTopic, "extension:purge-localStorage-caches")) {
ClearCaches(LocalStorageCache::kUnloadComplete, pattern, aOriginScope);
return NS_OK;
}
// Clear from caches everything that has been stored
// while in session-only mode
if (!strcmp(aTopic, "session-only-cleared")) {
ClearCaches(LocalStorageCache::kUnloadSession, pattern, aOriginScope);
return NS_OK;
}
// Clear everything (including so and pb data) from caches and database
// for the gived domain and subdomains.
if (!strcmp(aTopic, "domain-data-cleared")) {
ClearCaches(LocalStorageCache::kUnloadComplete, pattern, aOriginScope);
return NS_OK;
}
// Clear all private-browsing caches
if (!strcmp(aTopic, "private-browsing-data-cleared")) {
ClearCaches(LocalStorageCache::kUnloadPrivate, pattern, EmptyCString());
return NS_OK;
}
// Clear localStorage data beloging to an origin pattern
if (!strcmp(aTopic, "origin-attr-pattern-cleared")) {
ClearCaches(LocalStorageCache::kUnloadComplete, pattern, EmptyCString());
return NS_OK;
}
if (!strcmp(aTopic, "profile-change")) {
// For case caches are still referenced - clear them completely
ClearCaches(LocalStorageCache::kUnloadComplete, pattern, EmptyCString());
mCaches.Clear();
return NS_OK;
}
if (!strcmp(aTopic, "low-disk-space")) {
mLowDiskSpace = true;
return NS_OK;
}
if (!strcmp(aTopic, "no-low-disk-space")) {
mLowDiskSpace = false;
return NS_OK;
}
#ifdef DOM_STORAGE_TESTS
if (!strcmp(aTopic, "test-reload")) {
// This immediately completely reloads all caches from the database.
ClearCaches(LocalStorageCache::kTestReload, pattern, EmptyCString());
return NS_OK;
}
if (!strcmp(aTopic, "test-flushed")) {
if (!XRE_IsParentProcess()) {
nsCOMPtr<nsIObserverService> obs = mozilla::services::GetObserverService();
if (obs) {
obs->NotifyObservers(nullptr, "domstorage-test-flushed", nullptr);
}
}
return NS_OK;
}
#endif
NS_ERROR("Unexpected topic");
return NS_ERROR_UNEXPECTED;
}
LocalStorageManager*
LocalStorageManager::Ensure()
{
if (sSelf) {
return sSelf;
}
// Cause sSelf to be populated.
nsCOMPtr<nsIDOMStorageManager> initializer =
do_GetService("@mozilla.org/dom/localStorage-manager;1");
MOZ_ASSERT(sSelf, "Didn't initialize?");
return sSelf;
}
} // namespace dom
} // namespace mozilla