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// 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 "components/policy/core/common/policy_map.h"
#include "components/policy/core/common/policy_types.h"
#include "content/public/browser/browser_thread.h"
#include "extensions/browser/api/storage/settings_namespace.h"
#include "extensions/browser/value_store/value_store_change.h"
#include "extensions/browser/value_store/value_store_util.h"
using content::BrowserThread;
namespace util = value_store_util;
namespace extensions {
namespace {
scoped_ptr<ValueStore::Error> ReadOnlyError(scoped_ptr<std::string> key) {
return make_scoped_ptr(new ValueStore::Error(
ValueStore::READ_ONLY, "This is a read-only store.", key.Pass()));
}
} // 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) {
DCHECK_CURRENTLY_ON(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 the database is corrupted, try to restore it.
// This may have the unfortunate side-effect of incorrectly informing the
// extension of a "new" key, which isn't new and was corrupted. Unfortunately,
// there's not always a way around this - if the database is corrupted, there
// may be no way of telling which keys were previously present.
if (read_result->IsCorrupted()) {
if (delegate_->Restore())
read_result = delegate_->Get();
}
if (read_result->HasError()) {
LOG(WARNING) << "Failed to read managed settings for extension "
<< extension_id_ << ": " << read_result->error().message;
// 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.IsAtEnd(); 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()) {
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 MakeWriteResult(ReadOnlyError(util::NewKey(key)));
}
ValueStore::WriteResult PolicyValueStore::Set(
WriteOptions options, const base::DictionaryValue& settings) {
return MakeWriteResult(ReadOnlyError(util::NoKey()));
}
ValueStore::WriteResult PolicyValueStore::Remove(const std::string& key) {
return MakeWriteResult(ReadOnlyError(util::NewKey(key)));
}
ValueStore::WriteResult PolicyValueStore::Remove(
const std::vector<std::string>& keys) {
return MakeWriteResult(ReadOnlyError(util::NoKey()));
}
ValueStore::WriteResult PolicyValueStore::Clear() {
return MakeWriteResult(ReadOnlyError(util::NoKey()));
}
bool PolicyValueStore::Restore() { return delegate_->Restore(); }
bool PolicyValueStore::RestoreKey(const std::string& key) {
return delegate_->RestoreKey(key);
}
} // namespace extensions
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