Revert 176015

chrome/browser/extensions/api/storage/policy_value_store.cc

-// Copyright (c) 2012 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 "chrome/browser/extensions/api/storage/policy_value_store.h"
-
-#include "base/logging.h"
-#include "base/values.h"
-#include "chrome/browser/extensions/api/storage/settings_namespace.h"
-#include "chrome/browser/policy/policy_map.h"
-#include "chrome/browser/policy/policy_types.h"
-#include "chrome/browser/value_store/value_store_change.h"
-#include "content/public/browser/browser_thread.h"
-
-using content::BrowserThread;
-
-namespace extensions {
-
-namespace {
-
-const char kReadOnlyStoreErrorMessage[] = "This is a read-only store.";
-
-ValueStore::WriteResult WriteResultError() {
-  return ValueStore::MakeWriteResult(kReadOnlyStoreErrorMessage);
-}
-
-}  // namespace
-
-PolicyValueStore::PolicyValueStore(
-    const std::string& extension_id,
-    const scoped_refptr<SettingsObserverList>& observers,
-    scoped_ptr<ValueStore> delegate)
-    : extension_id_(extension_id),
-      observers_(observers),
-      delegate_(delegate.Pass()) {}
-
-PolicyValueStore::~PolicyValueStore() {}
-
-void PolicyValueStore::SetCurrentPolicy(const policy::PolicyMap& policy,
-                                        bool notify_if_changed) {
-  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE));
-  // Convert |policy| to a dictionary value. Only include mandatory policies
-  // for now.
-  base::DictionaryValue current_policy;
-  for (policy::PolicyMap::const_iterator it = policy.begin();
-       it != policy.end(); ++it) {
-    if (it->second.level == policy::POLICY_LEVEL_MANDATORY) {
-      current_policy.SetWithoutPathExpansion(
-          it->first, it->second.value->DeepCopy());
-    }
-  }
-
-  // Get the previous policies stored in the database.
-  // TODO(joaodasilva): it'd be better to have a less expensive way of
-  // determining which keys are currently stored, or of determining which keys
-  // must be removed.
-  base::DictionaryValue previous_policy;
-  ValueStore::ReadResult read_result = delegate_->Get();
-  if (read_result->HasError()) {
-    LOG(WARNING) << "Failed to read managed settings for extension "
-        << extension_id_ << ": " << read_result->error();
-    // Leave |previous_policy| empty, so that events are generated for every
-    // policy in |current_policy|.
-  } else {
-    read_result->settings()->Swap(&previous_policy);
-  }
-
-  // Now get two lists of changes: changes after setting the current policies,
-  // and changes after removing old policies that aren't in |current_policy|
-  // anymore.
-  std::vector<std::string> removed_keys;
-  for (base::DictionaryValue::Iterator it(previous_policy);
-       it.HasNext(); it.Advance()) {
-    if (!current_policy.HasKey(it.key()))
-      removed_keys.push_back(it.key());
-  }
-
-  ValueStoreChangeList changes;
-
-  WriteResult result = delegate_->Remove(removed_keys);
-  if (!result->HasError()) {
-    changes.insert(
-        changes.end(), result->changes().begin(), result->changes().end());
-  }
-
-  // IGNORE_QUOTA because these settings aren't writable by the extension, and
-  // are configured by the domain administrator.
-  ValueStore::WriteOptions options = ValueStore::IGNORE_QUOTA;
-  result = delegate_->Set(options, current_policy);
-  if (!result->HasError()) {
-    changes.insert(
-        changes.end(), result->changes().begin(), result->changes().end());
-  }
-
-  if (!changes.empty() && notify_if_changed) {
-    observers_->Notify(
-        &SettingsObserver::OnSettingsChanged,
-        extension_id_,
-        settings_namespace::MANAGED,
-        ValueStoreChange::ToJson(changes));
-  }
-}
-
-void PolicyValueStore::DeleteStorage() {
-  // This is called from our owner, indicating that storage for this extension
-  // should be removed.
-  delegate_->Clear();
-}
-
-size_t PolicyValueStore::GetBytesInUse(const std::string& key) {
-  // LeveldbValueStore doesn't implement this; and the underlying database
-  // isn't acccessible to the extension in any case; from the extension's
-  // perspective this is a read-only store.
-  return 0;
-}
-
-size_t PolicyValueStore::GetBytesInUse(const std::vector<std::string>& keys) {
-  // See note above.
-  return 0;
-}
-
-size_t PolicyValueStore::GetBytesInUse() {
-  // See note above.
-  return 0;
-}
-
-ValueStore::ReadResult PolicyValueStore::Get(const std::string& key) {
-  return delegate_->Get(key);
-}
-
-ValueStore::ReadResult PolicyValueStore::Get(
-    const std::vector<std::string>& keys) {
-  return delegate_->Get(keys);
-}
-
-ValueStore::ReadResult PolicyValueStore::Get() {
-  return delegate_->Get();
-}
-
-ValueStore::WriteResult PolicyValueStore::Set(
-    WriteOptions options, const std::string& key, const base::Value& value) {
-  return WriteResultError();
-}
-
-ValueStore::WriteResult PolicyValueStore::Set(
-    WriteOptions options, const base::DictionaryValue& settings) {
-  return WriteResultError();
-}
-
-ValueStore::WriteResult PolicyValueStore::Remove(const std::string& key) {
-  return WriteResultError();
-}
-
-ValueStore::WriteResult PolicyValueStore::Remove(
-    const std::vector<std::string>& keys) {
-  return WriteResultError();
-}
-
-ValueStore::WriteResult PolicyValueStore::Clear() {
-  return WriteResultError();
-}
-
-}  // namespace extensions