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/* Messenger.h
*
* An implementation of a simple text chat only messenger on the tox network core.
*
* NOTE: All the text in the messages must be encoded using UTF-8
*
* Copyright (C) 2013 Tox project All Rights Reserved.
*
* This file is part of Tox.
*
* Tox is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Tox 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Tox. If not, see <http://www.gnu.org/licenses/>.
*
*/
#ifndef MESSENGER_H
#define MESSENGER_H
#include "net_crypto.h"
#include "DHT.h"
#include "friend_requests.h"
#include "LAN_discovery.h"
#ifdef __cplusplus
extern "C" {
#endif
#define MAX_NAME_LENGTH 128
#define MAX_USERSTATUS_LENGTH 128
#define PACKET_ID_NICKNAME 48
#define PACKET_ID_USERSTATUS 49
#define PACKET_ID_RECEIPT 65
#define PACKET_ID_MESSAGE 64
/* status definitions */
#define FRIEND_ONLINE 4
#define FRIEND_CONFIRMED 3
#define FRIEND_REQUESTED 2
#define FRIEND_ADDED 1
#define NOFRIEND 0
/* errors for m_addfriend
* FAERR - Friend Add Error */
#define FAERR_TOOLONG -1
#define FAERR_NOMESSAGE -2
#define FAERR_OWNKEY -3
#define FAERR_ALREADYSENT -4
#define FAERR_UNKNOWN -5
/* don't assume MAX_USERSTATUS_LENGTH will stay at 128, it may be increased
to an absurdly large number later */
/* USERSTATUS_KIND
* Represents the different kinds of userstatus
* someone can have.
* More on this later... */
typedef enum {
USERSTATUS_KIND_RETAIN = (uint8_t)0, /* This is a special value that must not be returned by
* m_get_userstatus_kind. You can pass it into m_set_userstatus
* to keep the current USERSTATUS_KIND. */
USERSTATUS_KIND_ONLINE, /* Recommended representation: Green. */
USERSTATUS_KIND_AWAY, /* Recommended representation: Orange, or yellow. */
USERSTATUS_KIND_BUSY, /* Recommended representation: Red. */
USERSTATUS_KIND_OFFLINE, /* Recommended representation: Grey, semi-transparent. */
USERSTATUS_KIND_INVALID,
} USERSTATUS_KIND;
/*
* add a friend
* set the data that will be sent along with friend request
* client_id is the client id of the friend
* data is the data and length is the length
* returns the friend number if success
* return -1 if message length is too long
* return -2 if no message (message length must be >= 1 byte)
* return -3 if user's own key
* return -4 if friend request already sent or already a friend
* return -5 for unknown error
*/
int m_addfriend(uint8_t *client_id, uint8_t *data, uint16_t length);
/* add a friend without sending a friendrequest.
returns the friend number if success
return -1 if failure. */
int m_addfriend_norequest(uint8_t *client_id);
/* return the friend id associated to that client id.
return -1 if no such friend */
int getfriend_id(uint8_t *client_id);
/* copies the public key associated to that friend id into client_id buffer.
make sure that client_id is of size CLIENT_ID_SIZE.
return 0 if success
return -1 if failure */
int getclient_id(int friend_id, uint8_t *client_id);
/* remove a friend */
int m_delfriend(int friendnumber);
/* return 4 if friend is online
return 3 if friend is confirmed
return 2 if the friend request was sent
return 1 if the friend was added
return 0 if there is no friend with that number */
int m_friendstatus(int friendnumber);
/* send a text chat message to an online friend
returns the message id if packet was successfully put into the send queue
return 0 if it was not
you will want to retain the return value, it will be passed to your read receipt callback
if one is received.
m_sendmessage_withid will send a message with the id of your choosing,
however we can generate an id for you by calling plain m_sendmessage. */
uint32_t m_sendmessage(int friendnumber, uint8_t *message, uint32_t length);
uint32_t m_sendmessage_withid(int friendnumber, uint32_t theid, uint8_t *message, uint32_t length);
/* Set our nickname
name must be a string of maximum MAX_NAME_LENGTH length.
length must be at least 1 byte
length is the length of name with the NULL terminator
return 0 if success
return -1 if failure */
int setname(uint8_t *name, uint16_t length);
/* get our nickname
put it in name
return the length of the name*/
uint16_t getself_name(uint8_t *name);
/* get name of friendnumber
put it in name
name needs to be a valid memory location with a size of at least MAX_NAME_LENGTH (128) bytes.
return 0 if success
return -1 if failure */
int getname(int friendnumber, uint8_t *name);
/* set our user status
you are responsible for freeing status after
returns 0 on success, -1 on failure */
int m_set_userstatus(USERSTATUS_KIND kind, uint8_t *status, uint16_t length);
int m_set_userstatus_kind(USERSTATUS_KIND kind);
/* return the length of friendnumber's user status,
including null
pass it into malloc */
int m_get_userstatus_size(int friendnumber);
/* copy friendnumber's userstatus into buf, truncating if size is over maxlen
get the size you need to allocate from m_get_userstatus_size
The self variant will copy our own userstatus. */
int m_copy_userstatus(int friendnumber, uint8_t *buf, uint32_t maxlen);
int m_copy_self_userstatus(uint8_t *buf, uint32_t maxlen);
/* Return one of USERSTATUS_KIND values, except USERSTATUS_KIND_RETAIN.
* Values unknown to your application should be represented as USERSTATUS_KIND_ONLINE.
* As above, the self variant will return our own USERSTATUS_KIND.
* If friendnumber is invalid, this shall return USERSTATUS_KIND_INVALID. */
USERSTATUS_KIND m_get_userstatus_kind(int friendnumber);
USERSTATUS_KIND m_get_self_userstatus_kind(void);
/* Sets whether we send read receipts for friendnumber.
* This function is not lazy, and it will fail if yesno is not (0 or 1).*/
void m_set_sends_receipts(int friendnumber, int yesno);
/* set the function that will be executed when a friend request is received.
function format is function(uint8_t * public_key, uint8_t * data, uint16_t length) */
void m_callback_friendrequest(void (*function)(uint8_t *, uint8_t *, uint16_t));
/* set the function that will be executed when a message from a friend is received.
function format is: function(int friendnumber, uint8_t * message, uint32_t length) */
void m_callback_friendmessage(void (*function)(int, uint8_t *, uint16_t));
/* set the callback for name changes
function(int friendnumber, uint8_t *newname, uint16_t length)
you are not responsible for freeing newname */
void m_callback_namechange(void (*function)(int, uint8_t *, uint16_t));
/* set the callback for user status changes
function(int friendnumber, USERSTATUS_KIND kind, uint8_t *newstatus, uint16_t length)
you are not responsible for freeing newstatus */
void m_callback_userstatus(void (*function)(int, USERSTATUS_KIND, uint8_t *, uint16_t));
/* set the callback for read receipts
function(int friendnumber, uint32_t receipt)
if you are keeping a record of returns from m_sendmessage,
receipt might be one of those values, and that means the message
has been received on the other side. since core doesn't
track ids for you, receipt may not correspond to any message
in that case, you should discard it. */
void m_callback_read_receipt(void (*function)(int, uint32_t));
/* run this at startup
returns 0 if no connection problems
returns -1 if there are problems */
int initMessenger(void);
/* the main loop that needs to be run at least 200 times per second */
void doMessenger(void);
/* SAVING AND LOADING FUNCTIONS: */
/* returns the size of the messenger data (for saving) */
uint32_t Messenger_size(void);
/* save the messenger in data (must be allocated memory of size Messenger_size()) */
void Messenger_save(uint8_t *data);
/* load the messenger from data of size length */
int Messenger_load(uint8_t *data, uint32_t length);
#ifdef __cplusplus
}
#endif
#endif
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