res_pjsip_pidf_digium_body_supplement.c

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/*
 * asterisk -- An open source telephony toolkit.
 *
 * Copyright (C) 2014, Digium, Inc.
 *
 * Kevin Harwell <kharwell@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/presencestate.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"
 
static int pidf_supplement_body(void *body, void *data)
{
    struct ast_sip_exten_state_data *state_data = data;
    pj_xml_node *node;
    char sanitized[1024];
 
    /* The res_pjsip_exten_state module converts the user agent to lower case */
    if (ast_strlen_zero(state_data->user_agent) ||
        (!strstr(state_data->user_agent, "digium") &&
        !strstr(state_data->user_agent, "sangoma"))) {
        /* not a Sangoma phone */
        return 0;
    }
 
    if (!(node = ast_sip_presence_xml_create_node(
              state_data->pool, body, "tuple"))) {
        ast_log(LOG_WARNING, "Unable to create PIDF tuple\n");
        return -1;
    }
 
    ast_sip_presence_xml_create_attr(
        state_data->pool, node, "id", "digium-presence");
 
    if (!(node = ast_sip_presence_xml_create_node(
              state_data->pool, node, "status"))) {
        ast_log(LOG_WARNING, "Unable to create PIDF tuple status\n");
        return -1;
    }
 
    if (!(node = ast_sip_presence_xml_create_node(
              state_data->pool, node, "digium_presence"))) {
        ast_log(LOG_WARNING, "Unable to create digium presence\n");
        return -1;
    }
 
    if (!ast_strlen_zero(state_data->presence_message)) {
        ast_sip_sanitize_xml(state_data->presence_message, sanitized, sizeof(sanitized));
        pj_strdup2(state_data->pool, &node->content, sanitized);
    }
 
    ast_sip_presence_xml_create_attr(
        state_data->pool, node, "type", ast_presence_state2str(
            state_data->presence_state));
 
    if (!ast_strlen_zero(state_data->presence_subtype)) {
        ast_sip_sanitize_xml(state_data->presence_subtype, sanitized, sizeof(sanitized));
        ast_sip_presence_xml_create_attr(
            state_data->pool, node, "subtype", sanitized);
    }
 
    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 Sangoma presence 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",
);