Add support for Chrome Storage Extension API (issue #1947)

- Supports chrome.storage.local and chrome.storage.sync
- chrome.storage.sync behaves identically to chrome.storage.local

libcef/browser/extensions/api/storage/sync_value_store_cache.cc

@@ -0,0 +1,97 @@
+// Copyright 2017 The Chromium Embedded Framework Authors.
+// Portions copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "libcef/browser/extensions/api/storage/sync_value_store_cache.h"
+
+#include <stddef.h>
+
+#include <limits>
+
+#include "content/public/browser/browser_thread.h"
+#include "extensions/browser/api/storage/backend_task_runner.h"
+#include "extensions/browser/api/storage/weak_unlimited_settings_storage.h"
+#include "extensions/browser/value_store/value_store_factory.h"
+#include "extensions/common/api/storage.h"
+#include "extensions/common/extension.h"
+#include "extensions/common/permissions/permissions_data.h"
+
+using content::BrowserThread;
+
+namespace extensions {
+
+namespace cef {
+
+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
+
+SyncValueStoreCache::SyncValueStoreCache(
+    const scoped_refptr<ValueStoreFactory>& factory)
+    : storage_factory_(factory), quota_(GetLocalQuotaLimits()) {
+  DCHECK_CURRENTLY_ON(BrowserThread::UI);
+}
+
+SyncValueStoreCache::~SyncValueStoreCache() {
+  DCHECK(IsOnBackendSequence());
+}
+
+void SyncValueStoreCache::RunWithValueStoreForExtension(
+    const StorageCallback& callback,
+    scoped_refptr<const Extension> extension) {
+  DCHECK(IsOnBackendSequence());
+
+  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(
+          APIPermission::kUnlimitedStorage)) {
+    WeakUnlimitedSettingsStorage unlimited_storage(storage);
+    callback.Run(&unlimited_storage);
+  } else {
+    callback.Run(storage);
+  }
+}
+
+void SyncValueStoreCache::DeleteStorageSoon(const std::string& extension_id) {
+  DCHECK(IsOnBackendSequence());
+  storage_map_.erase(extension_id);
+  storage_factory_->DeleteSettings(settings_namespace::SYNC,
+                                   ValueStoreFactory::ModelType::APP,
+                                   extension_id);
+  storage_factory_->DeleteSettings(settings_namespace::SYNC,
+                                   ValueStoreFactory::ModelType::EXTENSION,
+                                   extension_id);
+}
+
+ValueStore* SyncValueStoreCache::GetStorage(const Extension* extension) {
+  StorageMap::iterator iter = storage_map_.find(extension->id());
+  if (iter != storage_map_.end())
+    return iter->second.get();
+
+  ValueStoreFactory::ModelType model_type =
+      extension->is_app() ? ValueStoreFactory::ModelType::APP
+                          : ValueStoreFactory::ModelType::EXTENSION;
+  std::unique_ptr<ValueStore> store = storage_factory_->CreateSettingsStore(
+      settings_namespace::SYNC, model_type, extension->id());
+  std::unique_ptr<SettingsStorageQuotaEnforcer> storage(
+      new SettingsStorageQuotaEnforcer(quota_, std::move(store)));
+  DCHECK(storage.get());
+
+  ValueStore* storage_ptr = storage.get();
+  storage_map_[extension->id()] = std::move(storage);
+  return storage_ptr;
+}
+}  // namespace cef
+}  // namespace extensions

libcef/browser/extensions/api/storage/sync_value_store_cache.h

@@ -0,0 +1,56 @@
+// Copyright 2017 The Chromium Embedded Framework Authors.
+// Portions copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CEF_LIBCEF_BROWSER_EXTENSIONS_API_STORAGE_SYNC_VALUE_STORE_CACHE_H_
+#define CEF_LIBCEF_BROWSER_EXTENSIONS_API_STORAGE_SYNC_VALUE_STORE_CACHE_H_
+
+#include <memory>
+
+#include "base/compiler_specific.h"
+#include "base/macros.h"
+#include "base/memory/ref_counted.h"
+#include "extensions/browser/api/storage/settings_storage_quota_enforcer.h"
+#include "extensions/browser/api/storage/value_store_cache.h"
+
+namespace extensions {
+
+class ValueStoreFactory;
+
+namespace cef {
+
+// Based on LocalValueStoreCache
+// ValueStoreCache for the SYNC namespace. It owns a backend for apps and
+// another for extensions. Each backend takes care of persistence.
+class SyncValueStoreCache : public ValueStoreCache {
+ public:
+  explicit SyncValueStoreCache(const scoped_refptr<ValueStoreFactory>& factory);
+  ~SyncValueStoreCache() override;
+
+  // ValueStoreCache implementation:
+  void RunWithValueStoreForExtension(
+      const StorageCallback& callback,
+      scoped_refptr<const Extension> extension) override;
+  void DeleteStorageSoon(const std::string& extension_id) override;
+
+ private:
+  using StorageMap = std::map<std::string, std::unique_ptr<ValueStore>>;
+
+  ValueStore* GetStorage(const Extension* extension);
+
+  // The Factory to use for creating new ValueStores.
+  const scoped_refptr<ValueStoreFactory> storage_factory_;
+
+  // Quota limits (see SettingsStorageQuotaEnforcer).
+  const SettingsStorageQuotaEnforcer::Limits quota_;
+
+  // The collection of ValueStores for local storage.
+  StorageMap storage_map_;
+
+  DISALLOW_COPY_AND_ASSIGN(SyncValueStoreCache);
+};
+}  // namespace cef
+}  // namespace extensions
+
+#endif  // CEF_LIBCEF_BROWSER_EXTENSIONS_API_STORAGE_SYNC_VALUE_STORE_CACHE_H_