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// Copyright 2015 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_PROXIMITY_AUTH_CRYPTAUTH_CRYPTAUTH_ENROLLMENT_MANAGER_H
#define COMPONENTS_PROXIMITY_AUTH_CRYPTAUTH_CRYPTAUTH_ENROLLMENT_MANAGER_H
#include "base/memory/scoped_ptr.h"
#include "base/memory/weak_ptr.h"
#include "base/observer_list.h"
#include "base/time/time.h"
#include "components/proximity_auth/cryptauth/proto/cryptauth_api.pb.h"
#include "components/proximity_auth/cryptauth/sync_scheduler.h"
class PrefRegistrySimple;
class PrefService;
namespace base {
class Clock;
class Time;
}
namespace proximity_auth {
class CryptAuthEnroller;
class CryptAuthEnrollerFactory;
// This class manages the device's enrollment with CryptAuth, periodically
// re-enrolling to keep the state on the server fresh. If an enrollment fails,
// the manager will schedule the next enrollment more aggressively to recover
// from the failure.
class CryptAuthEnrollmentManager : public SyncScheduler::Delegate {
public:
class Observer {
public:
// Called when an enrollment attempt is started.
virtual void OnEnrollmentStarted() = 0;
// Called when an enrollment attempt finishes with the |success| of the
// attempt.
virtual void OnEnrollmentFinished(bool success) = 0;
virtual ~Observer() {}
};
// Creates the manager:
// |clock|: Used to determine the time between sync attempts.
// |enroller_factory|: Creates CryptAuthEnroller instances to perform each
// enrollment attempt.
// |user_public_key|: The user's persistent public key identifying the device.
// |user_private_key|: The corresponding private key to |user_public_key|.
// |device_info|: Contains information about the local device that will be
// uploaded to CryptAuth with each enrollment request.
// |pref_service|: Contains preferences across browser restarts, and should
// have been registered through RegisterPrefs().
CryptAuthEnrollmentManager(
scoped_ptr<base::Clock> clock,
scoped_ptr<CryptAuthEnrollerFactory> enroller_factory,
const std::string& user_public_key,
const std::string& user_private_key,
const cryptauth::GcmDeviceInfo& device_info,
PrefService* pref_service);
~CryptAuthEnrollmentManager() override;
// Registers the prefs used by this class to the given |pref_service|.
static void RegisterPrefs(PrefRegistrySimple* registry);
// Begins scheduling periodic enrollment attempts.
void Start();
// Adds an observer.
void AddObserver(Observer* observer);
// Removes an observer.
void RemoveObserver(Observer* observer);
// Skips the waiting period and forces an enrollment immediately. If an
// enrollment is already in progress, this function does nothing.
// |invocation_reason| specifies the reason that the enrollment was triggered,
// which is upload to the server.
void ForceEnrollmentNow(cryptauth::InvocationReason invocation_reason);
// Returns true if a successful enrollment has been recorded and this
// enrollment has not expired.
bool IsEnrollmentValid() const;
// Returns the timestamp of the last successful enrollment. If no enrollment
// has ever been made, then a null base::Time object will be returned.
base::Time GetLastEnrollmentTime() const;
// Returns the time to the next enrollment attempt.
base::TimeDelta GetTimeToNextAttempt() const;
// Returns true if an enrollment attempt is currently in progress.
bool IsEnrollmentInProgress() const;
// Returns true if the last enrollment failed and the manager is now
// scheduling enrollments more aggressively to recover. If no enrollment has
// ever been recorded, then this function will also return true.
bool IsRecoveringFromFailure() const;
protected:
// Creates a new SyncScheduler instance. Exposed for testing.
virtual scoped_ptr<SyncScheduler> CreateSyncScheduler();
private:
// SyncScheduler::Delegate:
void OnSyncRequested(
scoped_ptr<SyncScheduler::SyncRequest> sync_request) override;
// Callback when |cryptauth_enroller_| completes.
void OnEnrollmentFinished(bool success);
// Used to determine the time.
scoped_ptr<base::Clock> clock_;
// Creates CryptAuthEnroller instances for each enrollment attempt.
scoped_ptr<CryptAuthEnrollerFactory> enroller_factory_;
// The user's persistent key-pair identifying the local device.
std::string user_public_key_;
std::string user_private_key_;
// The local device information to upload to CryptAuth.
const cryptauth::GcmDeviceInfo device_info_;
// Contains perferences that outlive the lifetime of this object and across
// process restarts.
// Not owned and must outlive this instance.
PrefService* pref_service_;
// Schedules the time between enrollment attempts.
scoped_ptr<SyncScheduler> scheduler_;
// Contains the SyncRequest that |scheduler_| requests when an enrollment
// attempt is made.
scoped_ptr<SyncScheduler::SyncRequest> sync_request_;
// The CryptAuthEnroller instance for the current enrollment attempt. A new
// instance will be created for each individual attempt.
scoped_ptr<CryptAuthEnroller> cryptauth_enroller_;
// List of observers.
base::ObserverList<Observer> observers_;
base::WeakPtrFactory<CryptAuthEnrollmentManager> weak_ptr_factory_;
DISALLOW_COPY_AND_ASSIGN(CryptAuthEnrollmentManager);
};
} // namespace proximity_auth
#endif // COMPONENTS_PROXIMITY_CRYPTAUTH_CRYPTAUTH_ENROLLMENT_MANAGER_H
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