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// Copyright 2020 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 COMPONENTS_POLICY_CORE_COMMON_POLICY_MIGRATOR_H_
#define COMPONENTS_POLICY_CORE_COMMON_POLICY_MIGRATOR_H_
#include "base/callback.h"
#include "base/values.h"
#include "components/policy/core/common/policy_bundle.h"
#include "components/policy/core/common/policy_map.h"
#include "components/policy/policy_export.h"
namespace policy {
// A helper class that migrates a deprecated policy to a new policy -
// potentially across domain boundaries, by setting up the new policy based on
// the old one. It can migrate a deprecated policy to a new policy.
//
// For migrations that are only in the Chrome domain and which are accessed via
// prefs: you should use |LegacyPoliciesDeprecatingPolicyHandler| instead.
class POLICY_EXPORT PolicyMigrator {
public:
virtual ~PolicyMigrator();
// If there are deprecated policies in |bundle|, set the value of the new
// policies accordingly.
virtual void Migrate(PolicyBundle* bundle) = 0;
// Indicates how to rename a policy when migrating the old policy to the new
// policy.
struct POLICY_EXPORT Migration {
using ValueTransform = base::RepeatingCallback<void(base::Value*)>;
Migration(Migration&&);
Migration(const char* old_name, const char* new_name);
Migration(const char* old_name,
const char* new_name,
ValueTransform transform);
~Migration();
// Old name for the policy
const char* old_name;
// New name for the policy, in the Chrome domain.
const char* new_name;
// Function to use to convert values from the old policy to the new
// policy (e.g. convert value types). It should mutate the Value in
// place. By default, it does no transform.
ValueTransform transform;
};
protected:
static void CopyPolicyIfUnset(PolicyMap& source,
PolicyMap* dest,
const Migration& migration);
};
} // namespace policy
#endif // COMPONENTS_POLICY_CORE_COMMON_POLICY_MIGRATOR_H_
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