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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 COMPONENTS_INVALIDATION_INVALIDATION_LISTENER_H_
#define COMPONENTS_INVALIDATION_INVALIDATION_LISTENER_H_
#include <stdint.h>
#include <memory>
#include <string>
#include "base/observer_list_types.h"
#include "base/time/time.h"
#include "components/invalidation/public/invalidation.h"
namespace gcm {
class GCMDriver;
}
namespace instance_id {
class InstanceIDDriver;
}
namespace invalidation {
// For the migration from topic based (Fandango) invalidations to direct
// message invalidations, this is a thin wrapper around the topic based
// invalidations. The only reason for having this is to provide the `type`
// method in the interface (as opposed to using the `topic` method).
// TODO(b/350013667) Once we fully migrated to direct message
// invalidations, we can delete `invalidation::Invalidation` and rename this to
// Invalidation.
class DirectInvalidation : public invalidation::Invalidation {
public:
using invalidation::Invalidation::Invalidation;
std::string type() const;
base::Time issue_timestamp() const;
};
// Interface to handle obtained registration tokens.
class RegistrationTokenHandler {
public:
virtual ~RegistrationTokenHandler() = default;
// Will be called whenever the registration token was obtained or refreshed.
virtual void OnRegistrationTokenReceived(
const std::string& registration_token,
base::Time token_end_of_life) = 0;
};
// Represents invalidations availability status.
enum class InvalidationsExpected {
kYes, // Both registration and upload succeeded.
kMaybe // One of registration or upload failed. Invalidations might
// still be received, but we should not rely on it.
};
// The `InvalidationListener` is receiving invalidation data messages via FM
// (formerly known as FCM formerly known as GCM). It also obtains the FM app
// registration token, aka app instance id.
//
// Expected elements of FM message data:
// {
// "type": string, # used to route the message to the correct observer.
// "version" : int,
// "payload" : string
// }
//
// Note that invalidation messages might get dropped while the service is not
// listening.
class InvalidationListener {
public:
// Application id for the `GCMDriver` used by invalidations.
static constexpr char kFmAppId[] = "com.google.chrome.fcm.invalidations";
// Represents version of the format of the invalidation messages that is
// parsed by the listener.
static constexpr int kInvalidationProtocolVersion = 1;
virtual ~InvalidationListener() = default;
enum class RegistrationTokenUploadStatus { kSucceeded, kFailed };
class Observer : public base::CheckedObserver {
public:
// Called when expectations about invalidations changed in the listener.
virtual void OnExpectationChanged(InvalidationsExpected expected) = 0;
// Called when an invalidation has been received.
virtual void OnInvalidationReceived(
const DirectInvalidation& invalidation) = 0;
// Will be called when the Observer is added the `InvalidationListener`.
// This way, the `InvalidationListener` will know which subject the
// `Observer` is interested in.
virtual std::string GetType() const = 0;
};
virtual void AddObserver(Observer* handler) = 0;
virtual bool HasObserver(const Observer* handler) const = 0;
virtual void RemoveObserver(const Observer* handler) = 0;
// Creates an `InvalidationListener` for `app_id_`.
// `gcm_driver` will typically be obtained like this:
// - device: g_browser_process->gcm_driver();
// - profile: instance_id::InstanceIDProfileServiceFactory
// ::GetForProfile(profile)->driver());
// `instance_id_driver` is typically obtained like this:
// - device: constructed on demand from `gcm_driver`;
// - profile: gcm::GCMProfileServiceFactory
// ::GetForProfile(profile)->driver();
//
// `project_number` is a pantheon project number, e.g.
// - `1013309121859` for DMServer invalidations, see the comment for
// `kCriticalInvalidationsProjectNumber`.
//
// `log_prefix` is a string that will be added in the beginning of each
// emitted log. The string should be wrapped with square brackets, e.g.
// `log_prefix = "[prefix]"`.
static std::unique_ptr<InvalidationListener> Create(
gcm::GCMDriver* gcm_driver,
instance_id::InstanceIDDriver* instance_id_driver,
int64_t project_number,
std::string log_prefix);
// The following functions are to be used by the `RegistrationTokenHandler`
// only.
// This must be called at most once before shutdown.
virtual void Start(RegistrationTokenHandler* handler) = 0;
virtual void SetRegistrationUploadStatus(
RegistrationTokenUploadStatus status) = 0;
virtual void Shutdown() = 0;
// Returns proeject number of Google Cloud Project this listener is registered
// with.
virtual int64_t project_number() const = 0;
};
} // namespace invalidation
#endif // COMPONENTS_INVALIDATION_INVALIDATION_LISTENER_H_
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