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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/settings/policy_value_store.h"
#include "base/logging.h"
#include "base/values.h"
#include "chrome/browser/extensions/settings/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
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