res_pjsip_pidf_body_generator.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"
 
static void *pidf_allocate_body(void *data)
{
    struct ast_sip_exten_state_data *state_data = data;
    char *local = ast_strdupa(state_data->local);
    pjpidf_pres *pres;
    pj_str_t entity;
 
    pres = pjpidf_create(state_data->pool, pj_cstr(&entity, ast_strip_quoted(local, "<", ">")));
 
    return pres;
}
 
static int pidf_generate_body_content(void *body, void *data)
{
    pjpidf_tuple *tuple;
    pj_str_t note, id, contact, priority;
    char *statestring = NULL, *pidfstate = NULL, *pidfnote = NULL;
    enum ast_sip_pidf_state local_state;
    char sanitized[PJSIP_MAX_URL_SIZE];
    pjpidf_pres *pres = body;
    struct ast_sip_exten_state_data *state_data = data;
 
    ast_sip_presence_exten_state_to_str(state_data->exten_state, &statestring,
            &pidfstate, &pidfnote, &local_state, 0);
 
    if (!pjpidf_pres_add_note(state_data->pool, pres, pj_cstr(&note, pidfnote))) {
        ast_log(LOG_WARNING, "Unable to add note to PIDF presence\n");
        return -1;
    }
 
    if (!(tuple = pjpidf_pres_add_tuple(state_data->pool, pres,
                    pj_cstr(&id, state_data->exten)))) {
        ast_log(LOG_WARNING, "Unable to create PIDF tuple\n");
        return -1;
    }
 
    ast_sip_sanitize_xml(state_data->remote, sanitized, sizeof(sanitized));
    pjpidf_tuple_set_contact(state_data->pool, tuple, pj_cstr(&contact, sanitized));
    pjpidf_tuple_set_contact_prio(state_data->pool, tuple, pj_cstr(&priority, "1"));
    pjpidf_status_set_basic_open(pjpidf_tuple_get_status(tuple),
            local_state == NOTIFY_OPEN || local_state == NOTIFY_INUSE);
 
    return 0;
}
 
#define MAX_STRING_GROWTHS 5
 
static void pidf_to_string(void *body, struct ast_str **str)
{
    pjpidf_pres *pres = body;
    int growths = 0;
    int size;
 
    do {
        size = pjpidf_print(pres, ast_str_buffer(*str), ast_str_size(*str) - 1);
        if (size <= AST_PJSIP_XML_PROLOG_LEN) {
            ast_str_make_space(str, ast_str_size(*str) * 2);
            ++growths;
        }
    } while (size <= AST_PJSIP_XML_PROLOG_LEN && growths < MAX_STRING_GROWTHS);
    if (size <= AST_PJSIP_XML_PROLOG_LEN) {
        ast_log(LOG_WARNING, "PIDF body text too large\n");
        return;
    }
 
    *(ast_str_buffer(*str) + size) = '\0';
    ast_str_update(*str);
}
 
static struct ast_sip_pubsub_body_generator pidf_body_generator = {
    .type = "application",
    .subtype = "pidf+xml",
    .body_type = AST_SIP_EXTEN_STATE_DATA,
    .allocate_body = pidf_allocate_body,
    .generate_body_content = pidf_generate_body_content,
    .to_string = pidf_to_string,
    /* No need for a destroy_body callback since we use a pool */
};
 
static int load_module(void)
{
    if (ast_sip_pubsub_register_body_generator(&pidf_body_generator)) {
        return AST_MODULE_LOAD_DECLINE;
    }
    return AST_MODULE_LOAD_SUCCESS;
}
 
static int unload_module(void)
{
    ast_sip_pubsub_unregister_body_generator(&pidf_body_generator);
    return 0;
}
 
AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_LOAD_ORDER, "PJSIP Extension State PIDF Provider",
    .support_level = AST_MODULE_SUPPORT_CORE,
    .load = load_module,
    .unload = unload_module,
    .load_pri = AST_MODPRI_CHANNEL_DEPEND,
    .requires = "res_pjsip,res_pjsip_pubsub",
);