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// Copyright 2014 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_PROXIMITY_AUTH_MESSENGER_IMPL_H_
#define CHROMEOS_ASH_COMPONENTS_PROXIMITY_AUTH_MESSENGER_IMPL_H_
#include <memory>
#include "base/containers/circular_deque.h"
#include "base/memory/weak_ptr.h"
#include "base/observer_list.h"
#include "base/values.h"
#include "chromeos/ash/components/proximity_auth/messenger.h"
#include "chromeos/ash/services/secure_channel/public/cpp/client/client_channel.h"
namespace proximity_auth {
// Concrete implementation of the Messenger interface.
class MessengerImpl : public Messenger,
public ash::secure_channel::ClientChannel::Observer {
public:
// Constructs a messenger that sends and receives messages.
//
// Messages are relayed over the provided |channel|.
//
// The messenger begins observing messages as soon as it is constructed.
explicit MessengerImpl(
std::unique_ptr<ash::secure_channel::ClientChannel> channel);
MessengerImpl(const MessengerImpl&) = delete;
MessengerImpl& operator=(const MessengerImpl&) = delete;
~MessengerImpl() override;
// Messenger:
void AddObserver(MessengerObserver* observer) override;
void RemoveObserver(MessengerObserver* observer) override;
void DispatchUnlockEvent() override;
void RequestUnlock() override;
ash::secure_channel::ClientChannel* GetChannel() const override;
private:
// Internal data structure to represent a pending message that either hasn't
// been sent yet or is waiting for a response from the remote device.
struct PendingMessage {
PendingMessage();
explicit PendingMessage(const base::Value::Dict& message);
explicit PendingMessage(const std::string& message);
~PendingMessage();
// The message, serialized as JSON.
const std::string json_message;
// The message type. This is possible to parse from the |json_message|; it's
// stored redundantly for convenience.
const std::string type;
};
// Pops the first of the |queued_messages_| and sends it to the remote device.
void ProcessMessageQueue();
// Called when the message is encoded so it can be sent over the connection.
void OnMessageEncoded(const std::string& encoded_message);
// Handles an incoming "status_update" |message|, parsing and notifying
// observers of the content.
void HandleRemoteStatusUpdateMessage(const base::Value::Dict& message);
// Handles an incoming "unlock_response" message, notifying observers of the
// response.
void HandleUnlockResponseMessage(const base::Value::Dict& message);
// ash::secure_channel::ClientChannel::Observer:
void OnDisconnected() override;
void OnMessageReceived(const std::string& payload) override;
// Called when a message has been recevied from the remote device. The message
// should be a valid JSON string.
void HandleMessage(const std::string& message);
// Called when a message has been sent to the remote device.
void OnSendMessageResult(bool success);
// Authenticated end-to-end channel used to communicate with the remote
// device.
std::unique_ptr<ash::secure_channel::ClientChannel> channel_;
// The registered observers of |this_| messenger.
base::ObserverList<MessengerObserver>::Unchecked observers_;
// Queue of messages to send to the remote device.
base::circular_deque<PendingMessage> queued_messages_;
// The current message being sent or waiting on the remote device for a
// response. Null if there is no message currently in this state.
std::unique_ptr<PendingMessage> pending_message_;
base::WeakPtrFactory<MessengerImpl> weak_ptr_factory_{this};
};
} // namespace proximity_auth
#endif // CHROMEOS_ASH_COMPONENTS_PROXIMITY_AUTH_MESSENGER_IMPL_H_
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