/* $Id$ */
/* 
 * Copyright (C) 2008-2011 Teluu Inc. (http://www.teluu.com)
 * Copyright (C) 2003-2008 Benny Prijono <benny@prijono.org>
 *
 * This program 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 2 of the License, or
 * (at your option) any later version.
 *
 * This program 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 this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA 
 */
#ifndef __PJSIP_SIMPLE_PRESENCE_H__
#define __PJSIP_SIMPLE_PRESENCE_H__

/**
 * @file presence.h
 * @brief SIP Extension for Presence (RFC 3856)
 */
#include <pjsip-simple/evsub.h>
#include <pjsip-simple/pidf.h>
#include <pjsip-simple/xpidf.h>
#include <pjsip-simple/rpid.h>


PJ_BEGIN_DECL


/**
 * @defgroup PJSIP_SIMPLE_PRES SIP Extension for Presence (RFC 3856)
 * @ingroup PJSIP_SIMPLE
 * @brief Support for SIP Extension for Presence (RFC 3856)
 * @{
 *
 * This module contains the implementation of SIP Presence Extension as 
 * described in RFC 3856. It uses the SIP Event Notification framework
 * (evsub.h) and extends the framework by implementing "presence"
 * event package.
 */


/**
 * Initialize the presence module and register it as endpoint module and
 * package to the event subscription module.
 *
 * @param endpt		The endpoint instance.
 * @param mod_evsub	The event subscription module instance.
 *
 * @return		PJ_SUCCESS if the module is successfully 
 *			initialized and registered to both endpoint
 *			and the event subscription module.
 */
PJ_DECL(pj_status_t) pjsip_pres_init_module(pjsip_endpoint *endpt,
					    pjsip_module *mod_evsub);


/**
 * Get the presence module instance.
 *
 * @return		The presence module instance.
 */
PJ_DECL(pjsip_module*) pjsip_pres_instance(void);


/**
 * Maximum presence status info.
 */
#define PJSIP_PRES_STATUS_MAX_INFO  8


/**
 * This structure describes presence status of a presentity.
 */
struct pjsip_pres_status
{
    unsigned		info_cnt;	/**< Number of info in the status.  */
    struct {

	pj_bool_t	basic_open;	/**< Basic status/availability.	    */
	pjrpid_element	rpid;		/**< Optional RPID info.	    */

	pj_str_t	id;		/**< Tuple id.			    */
	pj_str_t	contact;	/**< Optional contact address.	    */

	pj_xml_node    *tuple_node;	/**< Pointer to tuple XML node of
					     parsed PIDF body received from
					     remote agent. Only valid for
					     client subscription. If the
					     last received NOTIFY request
					     does not contain any PIDF body,
					     this valud will be set to NULL */

    } info[PJSIP_PRES_STATUS_MAX_INFO];	/**< Array of info.		    */

    pj_bool_t		_is_valid;	/**< Internal flag.		    */
};


/**
 * @see pjsip_pres_status
 */
typedef struct pjsip_pres_status pjsip_pres_status;


/**
 * Create presence client subscription session.
 *
 * @param dlg		The underlying dialog to use.
 * @param user_cb	Pointer to callbacks to receive presence subscription
 *			events.
 * @param options	Option flags. Currently only PJSIP_EVSUB_NO_EVENT_ID
 *			is recognized.
 * @param p_evsub	Pointer to receive the presence subscription
 *			session.
 *
 * @return		PJ_SUCCESS on success.
 */
PJ_DECL(pj_status_t) pjsip_pres_create_uac( pjsip_dialog *dlg,
					    const pjsip_evsub_user *user_cb,
					    unsigned options,
					    pjsip_evsub **p_evsub );


/**
 * Create presence server subscription session.
 *
 * @param dlg		The underlying dialog to use.
 * @param user_cb	Pointer to callbacks to receive presence subscription
 *			events.
 * @param rdata		The incoming SUBSCRIBE request that creates the event 
 *			subscription.
 * @param p_evsub	Pointer to receive the presence subscription
 *			session.
 *
 * @return		PJ_SUCCESS on success.
 */
PJ_DECL(pj_status_t) pjsip_pres_create_uas( pjsip_dialog *dlg,
					    const pjsip_evsub_user *user_cb,
					    pjsip_rx_data *rdata,
					    pjsip_evsub **p_evsub );


/**
 * Forcefully destroy the presence subscription. This function should only
 * be called on special condition, such as when the subscription 
 * initialization has failed. For other conditions, application MUST terminate
 * the subscription by sending the appropriate un(SUBSCRIBE) or NOTIFY.
 *
 * @param sub		The presence subscription.
 * @param notify	Specify whether the state notification callback
 *			should be called.
 *
 * @return		PJ_SUCCESS if subscription session has been destroyed.
 */
PJ_DECL(pj_status_t) pjsip_pres_terminate( pjsip_evsub *sub,
					   pj_bool_t notify );


/**
 * Call this function to create request to initiate presence subscription, to 
 * refresh subcription, or to request subscription termination.
 *
 * @param sub		Client subscription instance.
 * @param expires	Subscription expiration. If the value is set to zero,
 *			this will request unsubscription.
 * @param p_tdata	Pointer to receive the request.
 *
 * @return		PJ_SUCCESS on success.
 */
PJ_DECL(pj_status_t) pjsip_pres_initiate( pjsip_evsub *sub,
					  pj_int32_t expires,
					  pjsip_tx_data **p_tdata);


/**
 * Add a list of headers to the subscription instance. The list of headers
 * will be added to outgoing presence subscription requests.
 *
 * @param sub		Subscription instance.
 * @param hdr_list	List of headers to be added.
 *
 * @return		PJ_SUCCESS on success.
 */
PJ_DECL(pj_status_t) pjsip_pres_add_header( pjsip_evsub *sub,
					    const pjsip_hdr *hdr_list );


/**
 * Accept the incoming subscription request by sending 2xx response to
 * incoming SUBSCRIBE request.
 *
 * @param sub		Server subscription instance.
 * @param rdata		The incoming subscription request message.
 * @param st_code	Status code, which MUST be final response.
 * @param hdr_list	Optional list of headers to be added in the response.
 *
 * @return		PJ_SUCCESS on success.
 */
PJ_DECL(pj_status_t) pjsip_pres_accept( pjsip_evsub *sub,
					pjsip_rx_data *rdata,
				        int st_code,
					const pjsip_hdr *hdr_list );


/**
 * For notifier, create NOTIFY request to subscriber, and set the state 
 * of the subscription. Application MUST set the presence status to the
 * appropriate state (by calling #pjsip_pres_set_status()) before calling
 * this function.
 *
 * @param sub		The server subscription (notifier) instance.
 * @param state		New state to set.
 * @param state_str	The state string name, if state contains value other
 *			than active, pending, or terminated. Otherwise this
 *			argument is ignored.
 * @param reason	Specify reason if new state is terminated, otherwise
 *			put NULL.
 * @param p_tdata	Pointer to receive the request.
 *
 * @return		PJ_SUCCESS on success.
 */
PJ_DECL(pj_status_t) pjsip_pres_notify( pjsip_evsub *sub,
					pjsip_evsub_state state,
					const pj_str_t *state_str,
					const pj_str_t *reason,
					pjsip_tx_data **p_tdata);


/**
 * Create NOTIFY request to reflect current subscription status.
 *
 * @param sub		Server subscription object.
 * @param p_tdata	Pointer to receive request.
 *
 * @return		PJ_SUCCESS on success.
 */
PJ_DECL(pj_status_t) pjsip_pres_current_notify( pjsip_evsub *sub,
					        pjsip_tx_data **p_tdata );


/**
 * Send request message that was previously created with initiate(), notify(),
 * or current_notify(). Application may also send request created with other
 * functions, e.g. authentication. But the request MUST be either request
 * that creates/refresh subscription or NOTIFY request.
 *
 * @param sub		The subscription object.
 * @param tdata		Request message to be sent.
 *
 * @return		PJ_SUCCESS on success.
 */
PJ_DECL(pj_status_t) pjsip_pres_send_request( pjsip_evsub *sub,
					      pjsip_tx_data *tdata );


/**
 * Get the presence status. Client normally would call this function
 * after receiving NOTIFY request from server.
 *
 * @param sub		The client or server subscription.
 * @param status	The structure to receive presence status.
 *
 * @return		PJ_SUCCESS on success.
 */
PJ_DECL(pj_status_t) pjsip_pres_get_status( pjsip_evsub *sub,
					    pjsip_pres_status *status );


/**
 * Set the presence status. This operation is only valid for server
 * subscription. After calling this function, application would need to
 * send NOTIFY request to client.
 *
 * @param sub		The server subscription.
 * @param status	Status to be set.
 *
 * @return		PJ_SUCCESS on success.
 */
PJ_DECL(pj_status_t) pjsip_pres_set_status( pjsip_evsub *sub,
					    const pjsip_pres_status *status );


/**
 * This is a utility function to create PIDF message body from PJSIP
 * presence status (pjsip_pres_status).
 *
 * @param pool		The pool to allocate memory for the message body.
 * @param status	Presence status to be converted into PIDF message
 *			body.
 * @param entity	The entity ID, which normally is equal to the 
 *			presentity ID publishing this presence info.
 * @param p_body	Pointer to receive the SIP message body.
 *
 * @return		PJ_SUCCESS on success.
 */
PJ_DECL(pj_status_t) pjsip_pres_create_pidf( pj_pool_t *pool,
					     const pjsip_pres_status *status,
					     const pj_str_t *entity,
					     pjsip_msg_body **p_body );


/**
 * This is a utility function to create X-PIDF message body from PJSIP
 * presence status (pjsip_pres_status).
 *
 * @param pool		The pool to allocate memory for the message body.
 * @param status	Presence status to be converted into X-PIDF message
 *			body.
 * @param entity	The entity ID, which normally is equal to the 
 *			presentity ID publishing this presence info.
 * @param p_body	Pointer to receive the SIP message body.
 *
 * @return		PJ_SUCCESS on success.
 */
PJ_DECL(pj_status_t) pjsip_pres_create_xpidf(pj_pool_t *pool,
					     const pjsip_pres_status *status,
					     const pj_str_t *entity,
					     pjsip_msg_body **p_body );


/**
 * This is a utility function to parse PIDF body into PJSIP presence status.
 *
 * @param rdata		The incoming SIP message containing the PIDF body.
 * @param pool		Pool to allocate memory to copy the strings into
 *			the presence status structure.
 * @param status	The presence status to be initialized.
 *
 * @return		PJ_SUCCESS on success.
 *
 * @see pjsip_pres_parse_pidf2()
 */
PJ_DECL(pj_status_t) pjsip_pres_parse_pidf(pjsip_rx_data *rdata,
					   pj_pool_t *pool,
					   pjsip_pres_status *status);

/**
 * This is a utility function to parse PIDF body into PJSIP presence status.
 *
 * @param body		Text body, with one extra space at the end to place
 * 			NULL character temporarily during parsing.
 * @param body_len	Length of the body, not including the NULL termination
 * 			character.
 * @param pool		Pool to allocate memory to copy the strings into
 *			the presence status structure.
 * @param status	The presence status to be initialized.
 *
 * @return		PJ_SUCCESS on success.
 *
 * @see pjsip_pres_parse_pidf()
 */
PJ_DECL(pj_status_t) pjsip_pres_parse_pidf2(char *body, unsigned body_len,
					    pj_pool_t *pool,
					    pjsip_pres_status *status);


/**
 * This is a utility function to parse X-PIDF body into PJSIP presence status.
 *
 * @param rdata		The incoming SIP message containing the X-PIDF body.
 * @param pool		Pool to allocate memory to copy the strings into
 *			the presence status structure.
 * @param status	The presence status to be initialized.
 *
 * @return		PJ_SUCCESS on success.
 *
 * @see pjsip_pres_parse_xpidf2()
 */
PJ_DECL(pj_status_t) pjsip_pres_parse_xpidf(pjsip_rx_data *rdata,
					   pj_pool_t *pool,
					   pjsip_pres_status *status);


/**
 * This is a utility function to parse X-PIDF body into PJSIP presence status.
 *
 * @param body		Text body, with one extra space at the end to place
 * 			NULL character temporarily during parsing.
 * @param body_len	Length of the body, not including the NULL termination
 * 			character.
 * @param pool		Pool to allocate memory to copy the strings into
 *			the presence status structure.
 * @param status	The presence status to be initialized.
 *
 * @return		PJ_SUCCESS on success.
 *
 * @see pjsip_pres_parse_xpidf()
 */
PJ_DECL(pj_status_t) pjsip_pres_parse_xpidf2(char *body, unsigned body_len,
					     pj_pool_t *pool,
					     pjsip_pres_status *status);


/**
 * @}
 */

PJ_END_DECL


#endif	/* __PJSIP_SIMPLE_PRESENCE_H__ */