presence.c

基于sip协议的网络电话源码

    pres->status.info_cnt = status->info_cnt;

    return PJ_SUCCESS;
}


/*
 * Create message body.
 */
static pj_status_t pres_create_msg_body( pjsip_pres *pres, 
					 pjsip_tx_data *tdata)
{
    pj_str_t entity;

    /* Get publisher URI */
    entity.ptr = pj_pool_alloc(tdata->pool, PJSIP_MAX_URL_SIZE);
    entity.slen = pjsip_uri_print(PJSIP_URI_IN_REQ_URI,
				  pres->dlg->local.info->uri,
				  entity.ptr, PJSIP_MAX_URL_SIZE);
    if (entity.slen < 1)
	return PJ_ENOMEM;

    if (pres->content_type == CONTENT_TYPE_PIDF) {

	return pjsip_pres_create_pidf(tdata->pool, &pres->status,
				      &entity, &tdata->msg->body);

    } else if (pres->content_type == CONTENT_TYPE_XPIDF) {

	return pjsip_pres_create_xpidf(tdata->pool, &pres->status,
				       &entity, &tdata->msg->body);

    } else {
	return PJSIP_SIMPLE_EBADCONTENT;
    }
}


/*
 * Create NOTIFY
 */
PJ_DEF(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)
{
    pjsip_pres *pres;
    pjsip_tx_data *tdata;
    pj_status_t status;
    
    /* Check arguments. */
    PJ_ASSERT_RETURN(sub, PJ_EINVAL);

    /* Get the presence object. */
    pres = pjsip_evsub_get_mod_data(sub, mod_presence.id);
    PJ_ASSERT_RETURN(pres != NULL, PJSIP_SIMPLE_ENOPRESENCE);

    /* Must have at least one presence info. */
    PJ_ASSERT_RETURN(pres->status.info_cnt > 0, PJSIP_SIMPLE_ENOPRESENCEINFO);


    /* Lock object. */
    pjsip_dlg_inc_lock(pres->dlg);

    /* Create the NOTIFY request. */
    status = pjsip_evsub_notify( sub, state, state_str, reason, &tdata);
    if (status != PJ_SUCCESS)
	goto on_return;


    /* Create message body to reflect the presence status. */
    status = pres_create_msg_body( pres, tdata );
    if (status != PJ_SUCCESS)
	goto on_return;


    /* Done. */
    *p_tdata = tdata;


on_return:
    pjsip_dlg_dec_lock(pres->dlg);
    return status;
}


/*
 * Create NOTIFY that reflect current state.
 */
PJ_DEF(pj_status_t) pjsip_pres_current_notify( pjsip_evsub *sub,
					       pjsip_tx_data **p_tdata )
{
    pjsip_pres *pres;
    pjsip_tx_data *tdata;
    pj_status_t status;
    
    /* Check arguments. */
    PJ_ASSERT_RETURN(sub, PJ_EINVAL);

    /* Get the presence object. */
    pres = pjsip_evsub_get_mod_data(sub, mod_presence.id);
    PJ_ASSERT_RETURN(pres != NULL, PJSIP_SIMPLE_ENOPRESENCE);

    /* Must have at least one presence info. */
    PJ_ASSERT_RETURN(pres->status.info_cnt > 0, PJSIP_SIMPLE_ENOPRESENCEINFO);


    /* Lock object. */
    pjsip_dlg_inc_lock(pres->dlg);

    /* Create the NOTIFY request. */
    status = pjsip_evsub_current_notify( sub, &tdata);
    if (status != PJ_SUCCESS)
	goto on_return;


    /* Create message body to reflect the presence status. */
    status = pres_create_msg_body( pres, tdata );
    if (status != PJ_SUCCESS)
	goto on_return;


    /* Done. */
    *p_tdata = tdata;


on_return:
    pjsip_dlg_dec_lock(pres->dlg);
    return status;
}


/*
 * Send request.
 */
PJ_DEF(pj_status_t) pjsip_pres_send_request( pjsip_evsub *sub,
					     pjsip_tx_data *tdata )
{
    return pjsip_evsub_send_request(sub, tdata);
}


/*
 * This callback is called by event subscription when subscription
 * state has changed.
 */
static void pres_on_evsub_state( pjsip_evsub *sub, pjsip_event *event)
{
    pjsip_pres *pres;

    pres = pjsip_evsub_get_mod_data(sub, mod_presence.id);
    PJ_ASSERT_ON_FAIL(pres!=NULL, {return;});

    if (pres->user_cb.on_evsub_state)
	(*pres->user_cb.on_evsub_state)(sub, event);
}

/*
 * Called when transaction state has changed.
 */
static void pres_on_evsub_tsx_state( pjsip_evsub *sub, pjsip_transaction *tsx,
				     pjsip_event *event)
{
    pjsip_pres *pres;

    pres = pjsip_evsub_get_mod_data(sub, mod_presence.id);
    PJ_ASSERT_ON_FAIL(pres!=NULL, {return;});

    if (pres->user_cb.on_tsx_state)
	(*pres->user_cb.on_tsx_state)(sub, tsx, event);
}


/*
 * Called when SUBSCRIBE is received.
 */
static void pres_on_evsub_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)
{
    pjsip_pres *pres;

    pres = pjsip_evsub_get_mod_data(sub, mod_presence.id);
    PJ_ASSERT_ON_FAIL(pres!=NULL, {return;});

    if (pres->user_cb.on_rx_refresh) {
	(*pres->user_cb.on_rx_refresh)(sub, rdata, p_st_code, p_st_text,
				       res_hdr, p_body);

    } else {
	/* Implementors MUST send NOTIFY if it implements on_rx_refresh */
	pjsip_tx_data *tdata;
	pj_str_t timeout = { "timeout", 7};
	pj_status_t status;

	if (pjsip_evsub_get_state(sub)==PJSIP_EVSUB_STATE_TERMINATED) {
	    status = pjsip_pres_notify( sub, PJSIP_EVSUB_STATE_TERMINATED,
					NULL, &timeout, &tdata);
	} else {
	    status = pjsip_pres_current_notify(sub, &tdata);
	}

	if (status == PJ_SUCCESS)
	    pjsip_pres_send_request(sub, tdata);
    }
}


/*
 * Process the content of incoming NOTIFY request and update temporary
 * status.
 *
 * return PJ_SUCCESS if incoming request is acceptable. If return value
 *	  is not PJ_SUCCESS, res_hdr may be added with Warning header.
 */
static pj_status_t pres_process_rx_notify( pjsip_pres *pres,
					   pjsip_rx_data *rdata, 
					   int *p_st_code,
					   pj_str_t **p_st_text,
					   pjsip_hdr *res_hdr)
{
    pjsip_ctype_hdr *ctype_hdr;
    pj_status_t status;

    *p_st_text = NULL;

    /* Check Content-Type and msg body are present. */
    ctype_hdr = rdata->msg_info.ctype;

    if (ctype_hdr==NULL || rdata->msg_info.msg->body==NULL) {
	
	pjsip_warning_hdr *warn_hdr;
	pj_str_t warn_text;

	*p_st_code = PJSIP_SC_BAD_REQUEST;

	warn_text = pj_str("Message body is not present");
	warn_hdr = pjsip_warning_hdr_create(rdata->tp_info.pool, 399,
					    pjsip_endpt_name(pres->dlg->endpt),
					    &warn_text);
	pj_list_push_back(res_hdr, warn_hdr);

	return PJSIP_ERRNO_FROM_SIP_STATUS(PJSIP_SC_BAD_REQUEST);
    }

    /* Parse content. */

    if (pj_stricmp(&ctype_hdr->media.type, &STR_APPLICATION)==0 &&
	pj_stricmp(&ctype_hdr->media.subtype, &STR_PIDF_XML)==0)
    {
	status = pjsip_pres_parse_pidf( rdata, pres->dlg->pool,
					&pres->tmp_status);
    }
    else 
    if (pj_stricmp(&ctype_hdr->media.type, &STR_APPLICATION)==0 &&
	pj_stricmp(&ctype_hdr->media.subtype, &STR_XPIDF_XML)==0)
    {
	status = pjsip_pres_parse_xpidf( rdata, pres->dlg->pool,
					 &pres->tmp_status);
    }
    else
    {
	status = PJSIP_SIMPLE_EBADCONTENT;
    }

    if (status != PJ_SUCCESS) {
	/* Unsupported or bad Content-Type */
	pjsip_accept_hdr *accept_hdr;
	pjsip_warning_hdr *warn_hdr;

	*p_st_code = PJSIP_SC_NOT_ACCEPTABLE_HERE;

	/* Add Accept header */
	accept_hdr = pjsip_accept_hdr_create(rdata->tp_info.pool);
	accept_hdr->values[accept_hdr->count++] = STR_APP_PIDF_XML;
	accept_hdr->values[accept_hdr->count++] = STR_APP_XPIDF_XML;
	pj_list_push_back(res_hdr, accept_hdr);

	/* Add Warning header */
	warn_hdr = pjsip_warning_hdr_create_from_status(
				    rdata->tp_info.pool,
				    pjsip_endpt_name(pres->dlg->endpt),
				    status);
	pj_list_push_back(res_hdr, warn_hdr);

	return status;
    }

    /* If application calls pres_get_status(), redirect the call to
     * retrieve the temporary status.
     */
    pres->tmp_status._is_valid = PJ_TRUE;

    return PJ_SUCCESS;
}


/*
 * Called when NOTIFY is received.
 */
static void pres_on_evsub_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)
{
    pjsip_pres *pres;
    pj_status_t status;

    pres = pjsip_evsub_get_mod_data(sub, mod_presence.id);
    PJ_ASSERT_ON_FAIL(pres!=NULL, {return;});

    if (rdata->msg_info.msg->body) {
	status = pres_process_rx_notify( pres, rdata, p_st_code, p_st_text,
					 res_hdr );
	if (status != PJ_SUCCESS)
	    return;

    } else {
	/* This has just been changed. Previously, we treat incoming NOTIFY
	 * with no message body as having the presence subscription closed.
	 * Now we treat it as no change in presence status (ref: EyeBeam).
	 */
#if 1
	*p_st_code = 200;
	return;
#else
	unsigned i;
	/* Subscription is terminated. Consider contact is offline */
	pres->tmp_status._is_valid = PJ_TRUE;
	for (i=0; i<pres->tmp_status.info_cnt; ++i)
	    pres->tmp_status.info[i].basic_open = PJ_FALSE;
#endif
    }

    /* Notify application. */
    if (pres->user_cb.on_rx_notify) {
	(*pres->user_cb.on_rx_notify)(sub, rdata, p_st_code, p_st_text, 
				      res_hdr, p_body);
    }

    
    /* If application responded NOTIFY with 2xx, copy temporary status
     * to main status, and mark the temporary status as invalid.
     */
    if ((*p_st_code)/100 == 2) {
	pj_memcpy(&pres->status, &pres->tmp_status, sizeof(pjsip_pres_status));
    }

    pres->tmp_status._is_valid = PJ_FALSE;

    /* Done */
}

/*
 * Called when it's time to send SUBSCRIBE.
 */
static void pres_on_evsub_client_refresh(pjsip_evsub *sub)
{
    pjsip_pres *pres;

    pres = pjsip_evsub_get_mod_data(sub, mod_presence.id);
    PJ_ASSERT_ON_FAIL(pres!=NULL, {return;});

    if (pres->user_cb.on_client_refresh) {
	(*pres->user_cb.on_client_refresh)(sub);
    } else {
	pj_status_t status;
	pjsip_tx_data *tdata;

	status = pjsip_pres_initiate(sub, -1, &tdata);
	if (status == PJ_SUCCESS)
	    pjsip_pres_send_request(sub, tdata);
    }
}

/*
 * Called when no refresh is received after the interval.
 */
static void pres_on_evsub_server_timeout(pjsip_evsub *sub)
{
    pjsip_pres *pres;

    pres = pjsip_evsub_get_mod_data(sub, mod_presence.id);
    PJ_ASSERT_ON_FAIL(pres!=NULL, {return;});

    if (pres->user_cb.on_server_timeout) {
	(*pres->user_cb.on_server_timeout)(sub);
    } else {
	pj_status_t status;
	pjsip_tx_data *tdata;
	pj_str_t reason = { "timeout", 7 };

	status = pjsip_pres_notify(sub, PJSIP_EVSUB_STATE_TERMINATED,
				   NULL, &reason, &tdata);
	if (status == PJ_SUCCESS)
	    pjsip_pres_send_request(sub, tdata);
    }
}