res_pjsip_pidf_eyebeam_body_supplement.c

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/*
 * asterisk -- An open source telephony toolkit.
 *
 * Copyright (C) 2014, Digium, Inc.
 *
 * Mark Michelson <mmichelson@digium.com>
 *
 * See http://www.asterisk.org for more information about
 * the Asterisk project. Please do not directly contact
 * any of the maintainers of this project for assistance;
 * the project provides a web site, mailing lists and IRC
 * channels for your use.
 *
 * This program is free software, distributed under the terms of
 * the GNU General Public License Version 2. See the LICENSE file
 * at the top of the source tree.
 */
 
/*** MODULEINFO
    <depend>pjproject</depend>
    <depend>res_pjsip</depend>
    <depend>res_pjsip_pubsub</depend>
    <support_level>core</support_level>
 ***/
 
#include "asterisk.h"
 
#include <pjsip.h>
#include <pjsip_simple.h>
#include <pjlib.h>
 
#include "asterisk/module.h"
#include "asterisk/res_pjsip.h"
#include "asterisk/res_pjsip_pubsub.h"
#include "asterisk/res_pjsip_presence_xml.h"
#include "asterisk/res_pjsip_body_generator_types.h"
 
/*!
 * \internal
 * \brief Adds non standard elements to the xml body
 *
 * This is some code that was part of the original chan_sip implementation
 * that is not part of the RFC 3863 definition, but we are keeping available
 * for backward compatability. The original comment stated that Eyebeam
 * supports this format.
 */
static void add_eyebeam(pj_pool_t *pool, pj_xml_node *node, const char *pidfstate)
{
    static const char *XMLNS_DM_PREFIX = "xmlns:dm";
    static const char *XMLNS_DM = "urn:ietf:params:xml:ns:pidf:data-model";
 
    static const char *XMLNS_RPID_PREFIX = "xmlns:rpid";
    static const char *XMLNS_RPID = "urn:ietf:params:xml:ns:pidf:rpid";
 
    pj_xml_node *person = ast_sip_presence_xml_create_node(pool, node, "dm:person");
 
    if (pidfstate[0] != '-') {
        pj_xml_node *activities = ast_sip_presence_xml_create_node(pool, person, "rpid:activities");
        size_t str_size = sizeof("rpid:") + strlen(pidfstate);
        char *act_str = ast_alloca(str_size);
 
        /* Safe */
        strcpy(act_str, "rpid:");
        strcat(act_str, pidfstate);
 
        ast_sip_presence_xml_create_node(pool, activities, act_str);
    }
 
    ast_sip_presence_xml_create_attr(pool, node, XMLNS_DM_PREFIX, XMLNS_DM);
    ast_sip_presence_xml_create_attr(pool, node, XMLNS_RPID_PREFIX, XMLNS_RPID);
}
 
static int pidf_supplement_body(void *body, void *data)
{
    pjpidf_pres *pres = body;
    struct ast_sip_exten_state_data *state_data = data;
    char *statestring = NULL, *pidfstate = NULL, *pidfnote = NULL;
    enum ast_sip_pidf_state local_state;
 
    ast_sip_presence_exten_state_to_str(state_data->exten_state, &statestring,
            &pidfstate, &pidfnote, &local_state, 0);
 
    add_eyebeam(state_data->pool, pres, pidfstate);
    return 0;
}
 
static struct ast_sip_pubsub_body_supplement pidf_supplement = {
    .type = "application",
    .subtype = "pidf+xml",
    .supplement_body = pidf_supplement_body,
};
 
static int load_module(void)
{
    if (ast_sip_pubsub_register_body_supplement(&pidf_supplement)) {
        return AST_MODULE_LOAD_DECLINE;
    }
    return AST_MODULE_LOAD_SUCCESS;
}
 
static int unload_module(void)
{
    ast_sip_pubsub_unregister_body_supplement(&pidf_supplement);
    return 0;
}
 
AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_LOAD_ORDER, "PJSIP PIDF Eyebeam supplement",
    .support_level = AST_MODULE_SUPPORT_CORE,
    .load = load_module,
    .unload = unload_module,
    .load_pri = AST_MODPRI_CHANNEL_DEPEND,
    .requires = "res_pjsip,res_pjsip_pubsub",
);