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/*
This file is part of GNUnet.
Copyright (C) 2020 GNUnet e.V.
GNUnet is free software: you can redistribute it and/or modify it
under the terms of the GNU Affero General Public License as published
by the Free Software Foundation, either version 3 of the License,
or (at your option) any later version.
GNUnet is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
SPDX-License-Identifier: AGPL3.0-or-later
*/
/**
* @author Tobias Frisch
* @file src/messenger/gnunet-service-messenger_handle.h
* @brief GNUnet MESSENGER service
*/
#ifndef GNUNET_SERVICE_MESSENGER_HANDLE_H
#define GNUNET_SERVICE_MESSENGER_HANDLE_H
#include "platform.h"
#include "gnunet_cadet_service.h"
#include "gnunet_container_lib.h"
#include "gnunet_crypto_lib.h"
#include "gnunet_identity_service.h"
#include "gnunet_peer_lib.h"
#include "gnunet_mq_lib.h"
#include "gnunet-service-messenger_service.h"
#include "messenger_api_ego.h"
#include "messenger_api_message.h"
struct GNUNET_MESSENGER_SrvHandle
{
struct GNUNET_MESSENGER_Service *service;
struct GNUNET_MQ_Handle *mq;
char *name;
struct GNUNET_IDENTITY_Operation *operation;
struct GNUNET_MESSENGER_Ego *ego;
struct GNUNET_CONTAINER_MultiHashMap *member_ids;
};
/**
* Creates and allocates a new handle related to a <i>service</i> and using a given <i>mq</i> (message queue).
*
* @param service MESSENGER Service
* @param mq Message queue
* @return New handle
*/
struct GNUNET_MESSENGER_SrvHandle*
create_handle (struct GNUNET_MESSENGER_Service *service, struct GNUNET_MQ_Handle *mq);
/**
* Destroys a handle and frees its memory fully.
*
* @param handle Handle
*/
void
destroy_handle (struct GNUNET_MESSENGER_SrvHandle *handle);
/**
* Writes the path of the directory for a given <i>handle</i> using a specific <i>name</i> to the parameter
* <i>dir</i>. This directory will be used to store data regarding the handle and its messages.
*
* @param handle Handle
* @param name Potential name of the handle
* @param dir[out] Path to store data
*/
void
get_handle_data_subdir (struct GNUNET_MESSENGER_SrvHandle *handle, const char *name, char **dir);
/**
* Returns the member id of a given <i>handle</i> in a specific <i>room</i>.
*
* If the handle is not a member of the specific <i>room</i>, NULL gets returned.
*
* @param handle Handle
* @param key Key of a room
* @return Member id or NULL
*/
const struct GNUNET_ShortHashCode*
get_handle_member_id (const struct GNUNET_MESSENGER_SrvHandle *handle, const struct GNUNET_HashCode *key);
/**
* Changes the member id of a given <i>handle</i> in a specific <i>room</i> to match a <i>unique_id</i>.
*
* The client connected to the <i>handle</i> will be informed afterwards automatically.
*
* @param handle Handle
* @param key Key of a room
* @param unique_id Unique member id
*/
void
change_handle_member_id (struct GNUNET_MESSENGER_SrvHandle *handle, const struct GNUNET_HashCode *key,
const struct GNUNET_ShortHashCode *unique_id);
/**
* Returns the EGO used by a given <i>handle</i>.
*
* @param handle Handle
* @return EGO keypair
*/
struct GNUNET_MESSENGER_Ego*
get_handle_ego (struct GNUNET_MESSENGER_SrvHandle *handle);
/**
* Tries to set the name and EGO key of a <i>handle</i> initially by looking up a specific <i>name</i>.
*
* @param handle Handle
* @param name Name (optionally: valid EGO name)
*/
void
setup_handle_name (struct GNUNET_MESSENGER_SrvHandle *handle, const char *name);
/**
* Tries to change the keypair of an EGO of a <i>handle</i> under the same name and informs all rooms
* about the change automatically.
*
* @param handle Handle
* @return GNUNET_OK on success, otherwise GNUNET_SYSERR
*/
int
update_handle (struct GNUNET_MESSENGER_SrvHandle *handle);
/**
* Tries to rename the handle which implies renaming the EGO its using and moving all related data into
* the directory fitting to the changed <i>name</i>.
*
* The client connected to the <i>handle</i> will be informed afterwards automatically.
*
* @param handle Handle
* @param name New name
* @return GNUNET_OK on success, otherwise GNUNET_NO
*/
int
set_handle_name (struct GNUNET_MESSENGER_SrvHandle *handle, const char *name);
/**
* Makes a given <i>handle</i> a member of the room using a specific <i>key</i> and opens the
* room from the handles service.
*
* @param handle Handle
* @param key Key of a room
* @return GNUNET_YES on success, otherwise GNUNET_NO
*/
int
open_handle_room (struct GNUNET_MESSENGER_SrvHandle *handle, const struct GNUNET_HashCode *key);
/**
* Makes a given <i>handle</i> a member of the room using a specific <i>key</i> and enters the room
* through a tunnel to a peer identified by a given <i>door</i> (peer identity).
*
* @param handle Handle
* @param door Peer identity
* @param key Key of a room
* @return GNUNET_YES on success, otherwise GNUNET_NO
*/
int
entry_handle_room (struct GNUNET_MESSENGER_SrvHandle *handle, const struct GNUNET_PeerIdentity *door,
const struct GNUNET_HashCode *key);
/**
* Removes the membership of the room using a specific <i>key</i> and closes it if no other handle
* from this service is still a member of it.
*
* @param handle Handle
* @param key Key of a room
* @return GNUNET_YES on success, otherwise GNUNET_NO
*/
int
close_handle_room (struct GNUNET_MESSENGER_SrvHandle *handle, const struct GNUNET_HashCode *key);
/**
* Sends a <i>message</i> from a given <i>handle</i> to the room using a specific <i>key</i>.
*
* @param handle Handle
* @param key Key of a room
* @param message Message
* @return GNUNET_YES on success, otherwise GNUNET_NO
*/
int
send_handle_message (struct GNUNET_MESSENGER_SrvHandle *handle, const struct GNUNET_HashCode *key,
struct GNUNET_MESSENGER_Message *message);
/**
* Loads member ids and other potential configuration from a given <i>handle</i> which
* depends on the given name the <i>handle</i> uses.
*
* @param handle Handle
*/
void
load_handle_configuration(struct GNUNET_MESSENGER_SrvHandle *handle);
/**
* Saves member ids and other potential configuration from a given <i>handle</i> which
* depends on the given name the <i>handle</i> uses.
*
* @param handle Handle
*/
void
save_handle_configuration(struct GNUNET_MESSENGER_SrvHandle *handle);
#endif //GNUNET_SERVICE_MESSENGER_HANDLE_H
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