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// Copyright 2012 The Chromium Authors
// 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 <algorithm>
#include <utility>
#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 "components/value_store/value_store_change.h"
#include "extensions/browser/api/storage/backend_task_runner.h"
#include "extensions/browser/api/storage/storage_area_namespace.h"
#include "extensions/common/extension_id.h"
using value_store::ValueStore;
namespace extensions {
namespace {
ValueStore::Status ReadOnlyError() {
return ValueStore::Status(ValueStore::READ_ONLY,
"This is a read-only store.");
}
} // namespace
PolicyValueStore::PolicyValueStore(
const ExtensionId& extension_id,
SequenceBoundSettingsChangedCallback observer,
std::unique_ptr<ValueStore> delegate)
: extension_id_(extension_id),
observer_(std::move(observer)),
delegate_(std::move(delegate)) {}
PolicyValueStore::~PolicyValueStore() = default;
void PolicyValueStore::SetCurrentPolicy(const policy::PolicyMap& policy) {
DCHECK(IsOnBackendSequence());
// Convert |policy| to a dictionary value. Only include mandatory policies
// for now.
base::Value::Dict current_policy;
for (const auto& it : policy) {
if (it.second.level == policy::POLICY_LEVEL_MANDATORY) {
current_policy.Set(it.first, it.second.value_unsafe()->Clone());
}
}
// 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::Value::Dict previous_policy;
ValueStore::ReadResult read_result = delegate_->Get();
if (!read_result.status().ok()) {
LOG(WARNING) << "Failed to read managed settings for extension "
<< extension_id_ << ": " << read_result.status().message;
// Leave |previous_policy| empty, so that events are generated for every
// policy in |current_policy|.
} else {
std::swap(read_result.settings(), 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 (auto kv : previous_policy) {
if (!current_policy.Find(kv.first))
removed_keys.push_back(kv.first);
}
value_store::ValueStoreChangeList changes;
{
WriteResult result = delegate_->Remove(removed_keys);
if (result.status().ok()) {
auto new_changes = result.PassChanges();
changes.insert(changes.end(),
std::make_move_iterator(new_changes.begin()),
std::make_move_iterator(new_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;
WriteResult result = delegate_->Set(options, current_policy);
if (result.status().ok()) {
auto new_changes = result.PassChanges();
changes.insert(changes.end(),
std::make_move_iterator(new_changes.begin()),
std::make_move_iterator(new_changes.end()));
}
}
if (!changes.empty()) {
observer_->Run(extension_id_, StorageAreaNamespace::kManaged,
/*session_access_level=*/std::nullopt,
value_store::ValueStoreChange::ToValue(std::move(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::GetKeys() {
return delegate_->GetKeys();
}
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 WriteResult(ReadOnlyError());
}
ValueStore::WriteResult PolicyValueStore::Set(
WriteOptions options,
const base::Value::Dict& settings) {
return WriteResult(ReadOnlyError());
}
ValueStore::WriteResult PolicyValueStore::Remove(const std::string& key) {
return WriteResult(ReadOnlyError());
}
ValueStore::WriteResult PolicyValueStore::Remove(
const std::vector<std::string>& keys) {
return WriteResult(ReadOnlyError());
}
ValueStore::WriteResult PolicyValueStore::Clear() {
return WriteResult(ReadOnlyError());
}
} // namespace extensions
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