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Diffstat (limited to 'pjsip/include/pjsip-simple/evsub.h')
| -rw-r--r-- | pjsip/include/pjsip-simple/evsub.h | 505 |
1 files changed, 505 insertions, 0 deletions
diff --git a/pjsip/include/pjsip-simple/evsub.h b/pjsip/include/pjsip-simple/evsub.h new file mode 100644 index 0000000..5184a79 --- /dev/null +++ b/pjsip/include/pjsip-simple/evsub.h @@ -0,0 +1,505 @@ +/* $Id: evsub.h 3553 2011-05-05 06:14:19Z nanang $ */ +/* + * 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__ */ |