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+/* $Id$ */
+/* 
+ * 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_EVSUB_H__
+#define __PJSIP_SIMPLE_EVSUB_H__
+
+/**
+ * @file evsub.h
+ * @brief SIP Specific Event Notification Extension (RFC 3265)
+ */
+
+#include <pjsip-simple/types.h>
+
+
+/**
+ * @defgroup PJSIP_EVENT_NOT SIP Event Notification (RFC 3265) Module
+ * @ingroup PJSIP_SIMPLE
+ * @brief Core Event Subscription framework, used by presence, call transfer, etc.
+ * @{
+ *
+ * This module provides the implementation of SIP Extension for SIP Specific
+ * Event Notification (RFC 3265). It extends PJSIP by supporting SUBSCRIBE and
+ * NOTIFY methods.
+ *
+ * This module itself is extensible; new event packages can be registered to
+ * this module to handle specific extensions (such as presence).
+ */
+
+PJ_BEGIN_DECL
+
+
+/**
+ * Opaque type for event subscription session.
+ */
+typedef struct pjsip_evsub pjsip_evsub;
+
+
+/**
+ * This enumeration describes basic subscription state as described in the 
+ * RFC 3265. The standard specifies that extensions may define additional 
+ * states. In the case where the state is not known, the subscription state
+ * will be set to PJSIP_EVSUB_STATE_UNKNOWN, and the token will be kept
+ * in state_str member of the susbcription structure.
+ */
+enum pjsip_evsub_state
+{
+    PJSIP_EVSUB_STATE_NULL,	 /**< State is NULL.			    */
+    PJSIP_EVSUB_STATE_SENT,	 /**< Client has sent SUBSCRIBE request.    */
+    PJSIP_EVSUB_STATE_ACCEPTED,	 /**< 2xx response to SUBSCRIBE has been 
+				      sent/received.			    */
+    PJSIP_EVSUB_STATE_PENDING,	 /**< Subscription is pending.		    */
+    PJSIP_EVSUB_STATE_ACTIVE,	 /**< Subscription is active.		    */
+    PJSIP_EVSUB_STATE_TERMINATED,/**< Subscription is terminated.	    */
+    PJSIP_EVSUB_STATE_UNKNOWN,	 /**< Subscription state can not be determined.
+				      Application can query the state by 
+				      calling #pjsip_evsub_get_state_name().*/
+};
+
+/**
+ * @see pjsip_evsub_state
+ */
+typedef enum pjsip_evsub_state pjsip_evsub_state;
+
+
+/**
+ * Some options for the event subscription.
+ */
+enum
+{
+    /** 
+     * If this flag is set, then outgoing request to create subscription
+     * will not have id in the Event header (e.g. in REFER request). But if 
+     * there is an id in the incoming NOTIFY, that id will be used.
+     */
+    PJSIP_EVSUB_NO_EVENT_ID  = 1,
+};
+
+
+/**
+ * This structure describes callback that is registered by application or
+ * package to receive notifications about subscription events.
+ */
+struct pjsip_evsub_user
+{
+    /**
+     * This callback is called when subscription state has changed.
+     * Application MUST be prepared to receive NULL event and events with
+     * type other than PJSIP_EVENT_TSX_STATE
+     *
+     * This callback is OPTIONAL.
+     *
+     * @param sub	The subscription instance.
+     * @param event	The event that has caused the state to change,
+     *			which may be NULL or may have type other than
+     *			PJSIP_EVENT_TSX_STATE.
+     */
+    void (*on_evsub_state)( pjsip_evsub *sub, pjsip_event *event);
+
+    /**
+     * This callback is called when transaction state has changed.
+     *
+     * @param sub	The subscription instance.
+     * @param tsx	Transaction.
+     * @param event	The event.
+     */
+    void (*on_tsx_state)(pjsip_evsub *sub, pjsip_transaction *tsx,
+			 pjsip_event *event);
+
+    /**
+     * This callback is called when incoming SUBSCRIBE (or any method that
+     * establishes the subscription in the first place) is received. It 
+     * allows application to specify what response should be sent to 
+     * remote, along with additional headers and message body to be put 
+     * in the response.
+     *
+     * This callback is OPTIONAL.
+     *
+     * However, implementation MUST send NOTIFY request upon receiving this
+     * callback. The suggested behavior is to call 
+     * #pjsip_evsub_current_notify(), since this function takes care
+     * about unsubscription request and calculates the appropriate expiration
+     * interval.
+     */
+    void (*on_rx_refresh)( pjsip_evsub *sub, 
+			   pjsip_rx_data *rdata,
+			   int *p_st_code,
+			   pj_str_t **p_st_text,
+			   pjsip_hdr *res_hdr,
+			   pjsip_msg_body **p_body);
+
+    /**
+     * This callback is called when client/subscriber received incoming
+     * NOTIFY request. It allows the application to specify what response
+     * should be sent to remote, along with additional headers and message
+     * body to be put in the response.
+     *
+     * This callback is OPTIONAL. When it is not implemented, the default
+     * behavior is to respond incoming NOTIFY request with 200 (OK).
+     *
+     * @param sub	The subscription instance.
+     * @param rdata	The received NOTIFY request.
+     * @param p_st_code	Application MUST set the value of this argument with
+     *			final status code (200-699) upon returning from the
+     *			callback.
+     * @param p_st_text	Custom status text, if any.
+     * @param res_hdr	Upon return, application can put additional headers 
+     *			to be sent in the response in this list.
+     * @param p_body	Application MAY specify message body to be sent in
+     *			the response.
+     */
+    void (*on_rx_notify)(pjsip_evsub *sub, 
+			 pjsip_rx_data *rdata,
+			 int *p_st_code,
+			 pj_str_t **p_st_text,
+			 pjsip_hdr *res_hdr,
+			 pjsip_msg_body **p_body);
+
+    /**
+     * This callback is called when it is time for the client to refresh
+     * the subscription.
+     *
+     * This callback is OPTIONAL when PJSIP package such as presence or 
+     * refer is used; the event package will refresh subscription by sending
+     * SUBSCRIBE with the interval set to current/last interval.
+     *
+     * @param sub	The subscription instance.
+     */
+    void (*on_client_refresh)(pjsip_evsub *sub);
+
+    /**
+     * This callback is called when server doesn't receive subscription 
+     * refresh after the specified subscription interval.
+     *
+     * This callback is OPTIONAL when PJSIP package such as presence or 
+     * refer is used; the event package send NOTIFY to terminate the 
+     * subscription.
+     */
+    void (*on_server_timeout)(pjsip_evsub *sub);
+
+};
+
+
+/**
+ * @see pjsip_evsub_user
+ */
+typedef struct pjsip_evsub_user pjsip_evsub_user;
+
+
+/**
+ * SUBSCRIBE method constant. @see pjsip_get_subscribe_method()
+ */
+PJ_DECL_DATA(const pjsip_method) pjsip_subscribe_method;
+
+/**
+ * NOTIFY method constant. @see pjsip_get_notify_method()
+ */
+PJ_DECL_DATA(const pjsip_method) pjsip_notify_method;
+
+/**
+ * SUBSCRIBE method constant.
+ */
+PJ_DECL(const pjsip_method*) pjsip_get_subscribe_method(void);
+
+/**
+ * NOTIFY method constant.
+ */
+PJ_DECL(const pjsip_method*) pjsip_get_notify_method(void);
+
+
+/**
+ * Initialize the event subscription module and register the module to the 
+ * specified endpoint.
+ *
+ * @param endpt		The endpoint instance.
+ *
+ * @return		PJ_SUCCESS if module can be created and registered
+ *			successfully.
+ */
+PJ_DECL(pj_status_t) pjsip_evsub_init_module(pjsip_endpoint *endpt);
+
+
+/**
+ * Get the event subscription module instance that was previously created 
+ * and registered to endpoint.
+ *
+ * @return		The event subscription module instance.
+ */
+PJ_DECL(pjsip_module*) pjsip_evsub_instance(void);
+
+
+/**
+ * Register event package to the event subscription framework.
+ *
+ * @param pkg_mod	The module that implements the event package being
+ *			registered.
+ * @param event_name	Event package identification.
+ * @param expires	Default subscription expiration time, in seconds.
+ * @param accept_cnt	Number of strings in Accept array.
+ * @param accept	Array of Accept value.
+ *
+ * @return		PJ_SUCCESS on success.
+ */
+PJ_DECL(pj_status_t) pjsip_evsub_register_pkg( pjsip_module *pkg_mod,
+					       const pj_str_t *event_name,
+					       unsigned expires,
+					       unsigned accept_cnt,
+					       const pj_str_t accept[]);
+
+/**
+ * Get the Allow-Events header. This header is built based on the packages
+ * that are registered to the evsub module.
+ *
+ * @param m		Pointer to event subscription module instance, or
+ *			NULL to use default instance (equal to 
+ *			#pjsip_evsub_instance()).
+ *
+ * @return		The Allow-Events header.
+ */
+PJ_DECL(const pjsip_hdr*) pjsip_evsub_get_allow_events_hdr(pjsip_module *m);
+
+
+/**
+ * Create client subscription session.
+ *
+ * @param dlg		The underlying dialog to use.
+ * @param user_cb	Callback to receive event subscription notifications.
+ * @param event		Event name.
+ * @param option	Bitmask of options.
+ * @param p_evsub	Pointer to receive event subscription instance.
+ *
+ * @return		PJ_SUCCESS on success.
+ */
+PJ_DECL(pj_status_t) pjsip_evsub_create_uac( pjsip_dialog *dlg,
+					     const pjsip_evsub_user *user_cb,
+					     const pj_str_t *event,
+					     unsigned option,
+					     pjsip_evsub **p_evsub);
+
+/**
+ * Create server subscription session.
+ *
+ * @param dlg		The underlying dialog to use.
+ * @param user_cb	Callback to receive event subscription notifications.
+ * @param rdata		The incoming request that creates the event 
+ *			subscription, such as SUBSCRIBE or REFER.
+ * @param option	Bitmask of options.
+ * @param p_evsub	Pointer to receive event subscription instance.
+ *
+ * @return		PJ_SUCCESS on success.
+ */
+PJ_DECL(pj_status_t) pjsip_evsub_create_uas( pjsip_dialog *dlg,
+					     const pjsip_evsub_user *user_cb,
+					     pjsip_rx_data *rdata,
+					     unsigned option,
+					     pjsip_evsub **p_evsub);
+
+/**
+ * Forcefully destroy the subscription session. 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 event 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_evsub_terminate( pjsip_evsub *sub,
+					    pj_bool_t notify );
+
+
+/**
+ * Get subscription state.
+ *
+ * @param sub		Event subscription instance.
+ *
+ * @return		Subscription state.
+ */
+PJ_DECL(pjsip_evsub_state) pjsip_evsub_get_state(pjsip_evsub *sub);
+
+
+/**
+ * Get the string representation of the subscription state.
+ *
+ * @param sub		Event subscription instance.
+ *
+ * @return		NULL terminated string.
+ */
+PJ_DECL(const char*) pjsip_evsub_get_state_name(pjsip_evsub *sub);
+
+
+/**
+ * Get subscription termination reason, if any. If remote did not
+ * send termination reason, this function will return empty string.
+ *
+ * @param sub		Event subscription instance.
+ *
+ * @return		NULL terminated string.
+ */
+PJ_DECL(const pj_str_t*) pjsip_evsub_get_termination_reason(pjsip_evsub *sub);
+
+
+/**
+ * Call this function to create request to initiate subscription, to 
+ * refresh subcription, or to request subscription termination.
+ *
+ * @param sub		Client subscription instance.
+ * @param method	The method that establishes the subscription, such as
+ *			SUBSCRIBE or REFER. If this argument is NULL, then
+ *			SUBSCRIBE will be used.
+ * @param expires	Subscription expiration. If the value is set to zero,
+ *			this will request unsubscription. If the value is
+ *			negative, default expiration as defined by the package
+ *			will be used.
+ * @param p_tdata	Pointer to receive the request.
+ *
+ * @return		PJ_SUCCESS on success.
+ */
+PJ_DECL(pj_status_t) pjsip_evsub_initiate( pjsip_evsub *sub,
+					   const pjsip_method *method,
+					   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_evsub_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_evsub_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.
+ *
+ * @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 request message.
+ *
+ * @return		PJ_SUCCESS on success.
+ */
+PJ_DECL(pj_status_t) pjsip_evsub_notify( pjsip_evsub *sub,
+					 pjsip_evsub_state state,
+					 const pj_str_t *state_str,
+					 const pj_str_t *reason,
+					 pjsip_tx_data **p_tdata);
+
+
+/**
+ * For notifier, create a NOTIFY request that reflects current subscription
+ * status.
+ *
+ * @param sub		The server subscription instance.
+ * @param p_tdata	Pointer to receive the request messge.
+ *
+ * @return		PJ_SUCCESS on success.
+ */
+PJ_DECL(pj_status_t) pjsip_evsub_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 event subscription object.
+ * @param tdata		Request message to be send.
+ *
+ * @return		PJ_SUCCESS on success.
+ */
+PJ_DECL(pj_status_t) pjsip_evsub_send_request( pjsip_evsub *sub,
+					       pjsip_tx_data *tdata);
+
+
+
+/**
+ * Get the event subscription instance associated with the specified 
+ * transaction.
+ *
+ * @param tsx		The transaction.
+ *
+ * @return		The event subscription instance registered in the
+ *			transaction, if any.
+ */
+PJ_DECL(pjsip_evsub*) pjsip_tsx_get_evsub(pjsip_transaction *tsx);
+
+
+/**
+ * Set event subscription's module data.
+ *
+ * @param sub		The event subscription.
+ * @param mod_id	The module id.
+ * @param data		Arbitrary data.
+ */
+PJ_DECL(void) pjsip_evsub_set_mod_data( pjsip_evsub *sub, unsigned mod_id,
+				        void *data );
+
+
+/**
+ * Get event subscription's module data.
+ *
+ * @param sub		The event subscription.
+ * @param mod_id	The module id.
+ *
+ * @return		Data previously set at the specified id.
+ */
+PJ_DECL(void*) pjsip_evsub_get_mod_data( pjsip_evsub *sub, unsigned mod_id );
+
+
+
+PJ_END_DECL
+
+/**
+ * @}
+ */
+
+#endif	/* __PJSIP_SIMPLE_EVSUB_H__ */