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// Copyright 2024 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROMEOS_ASH_COMPONENTS_KCER_EXTRA_INSTANCES_H_
#define CHROMEOS_ASH_COMPONENTS_KCER_EXTRA_INSTANCES_H_
#include "base/no_destructor.h"
#include "chromeos/ash/components/kcer/kcer.h"
#include "chromeos/ash/components/kcer/kcer_impl.h"
namespace kcer {
// This class is a singleton that provides access to some special Kcer
// instances. It is separate from KcerFactory primarily for the code under
// */components/* and other places that don't have access to Profile-s and
// cannot use KcerFactory. Using KcerFactory should be preferred whenever
// possible.
// TODO(miersh): This class was implemented to simplify the migration from NSS
// to Kcer. Eventually all the code should be refactored to either retrieve the
// correct Kcer instance by a Profile or receive the instance as an input. This
// class should be merged into KcerFactory after that.
class COMPONENT_EXPORT(KCER) ExtraInstances {
public:
static ExtraInstances* Get();
// Retrieves the Kcer instance for the main profile (or EmptyKcer, if there's
// none). This method is only introduced to migrate some existing code from
// NSS to Kcer. If at all possible, all new code should either fetch Kcer from
// KcerFactory by Profile or receive a pointer to the correct Kcer instance as
// an argument.
static base::WeakPtr<Kcer> GetDefaultKcer();
// Returns a Kcer instance without any tokens.
static base::WeakPtr<Kcer> GetEmptyKcer();
// Returns a Kcer instance with just the device token (or with no tokens, if
// the device token should not be available in the current environment, e.g.
// in Lacros).
static base::WeakPtr<Kcer> GetDeviceKcer();
// Initializes DeviceKcer. DeviceKcer can be used immediately after creation,
// but it won't complete any requests until it's initialized.
void InitializeDeviceKcer(scoped_refptr<base::TaskRunner> token_task_runner,
base::WeakPtr<internal::KcerToken> device_token);
// Used by KcerFactory to update the value returned from GetDefaultKcer().
void SetDefaultKcer(base::WeakPtr<Kcer> default_kcer);
private:
friend class base::NoDestructor<ExtraInstances>;
ExtraInstances();
~ExtraInstances();
internal::KcerImpl empty_kcer_;
// Only initialized in Ash.
std::unique_ptr<internal::KcerImpl> device_kcer_;
// Contains a nullptr on the login screen. In a user session contains Kcer for
// the profile of the primary user. After the primary profile is destroyed,
// the pointer is automatically invalidated.
base::WeakPtr<Kcer> default_kcer_;
};
} // namespace kcer
#endif // CHROMEOS_ASH_COMPONENTS_KCER_EXTRA_INSTANCES_H_
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