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// Copyright 2014 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "extensions/browser/api/storage/local_value_store_cache.h"
#include <stddef.h>
#include <limits>
#include <utility>
#include "components/value_store/value_store_factory.h"
#include "content/public/browser/browser_thread.h"
#include "extensions/browser/api/storage/backend_task_runner.h"
#include "extensions/browser/api/storage/value_store_util.h"
#include "extensions/browser/api/storage/weak_unlimited_settings_storage.h"
#include "extensions/common/api/storage.h"
#include "extensions/common/extension.h"
#include "extensions/common/extension_id.h"
#include "extensions/common/permissions/permissions_data.h"
using content::BrowserThread;
namespace extensions {
namespace {
// Returns the quota limit for local storage, taken from the schema in
// extensions/common/api/storage.json.
SettingsStorageQuotaEnforcer::Limits GetLocalQuotaLimits() {
SettingsStorageQuotaEnforcer::Limits limits = {
static_cast<size_t>(api::storage::local::QUOTA_BYTES),
std::numeric_limits<size_t>::max(), std::numeric_limits<size_t>::max()};
return limits;
}
} // namespace
LocalValueStoreCache::LocalValueStoreCache(
scoped_refptr<value_store::ValueStoreFactory> factory)
: storage_factory_(std::move(factory)), quota_(GetLocalQuotaLimits()) {
DCHECK_CURRENTLY_ON(BrowserThread::UI);
}
LocalValueStoreCache::~LocalValueStoreCache() {
DCHECK(IsOnBackendSequence());
}
void LocalValueStoreCache::RunWithValueStoreForExtension(
StorageCallback callback,
scoped_refptr<const Extension> extension) {
DCHECK(IsOnBackendSequence());
value_store::ValueStore* storage = GetStorage(extension.get());
// A neat way to implement unlimited storage; if the extension has the
// unlimited storage permission, force through all calls to Set().
if (extension->permissions_data()->HasAPIPermission(
mojom::APIPermissionID::kUnlimitedStorage)) {
WeakUnlimitedSettingsStorage unlimited_storage(storage);
std::move(callback).Run(&unlimited_storage);
} else {
std::move(callback).Run(storage);
}
}
void LocalValueStoreCache::DeleteStorageSoon(const ExtensionId& extension_id) {
DCHECK(IsOnBackendSequence());
storage_map_.erase(extension_id);
value_store_util::DeleteValueStore(settings_namespace::LOCAL,
value_store_util::ModelType::APP,
extension_id, storage_factory_);
value_store_util::DeleteValueStore(settings_namespace::LOCAL,
value_store_util::ModelType::EXTENSION,
extension_id, storage_factory_);
}
value_store::ValueStore* LocalValueStoreCache::GetStorage(
const Extension* extension) {
auto iter = storage_map_.find(extension->id());
if (iter != storage_map_.end()) {
return iter->second.get();
}
value_store_util::ModelType model_type =
extension->is_app() ? value_store_util::ModelType::APP
: value_store_util::ModelType::EXTENSION;
std::unique_ptr<value_store::ValueStore> store =
value_store_util::CreateSettingsStore(settings_namespace::LOCAL,
model_type, extension->id(),
storage_factory_);
std::unique_ptr<SettingsStorageQuotaEnforcer> storage(
new SettingsStorageQuotaEnforcer(quota_, std::move(store)));
DCHECK(storage.get());
value_store::ValueStore* storage_ptr = storage.get();
storage_map_[extension->id()] = std::move(storage);
return storage_ptr;
}
} // namespace extensions
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