res_pjsip_one_touch_record_info.c

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/*
 * Asterisk -- An open source telephony toolkit.
 *
 * Copyright (C) 2013, malleable, llc.
 *
 * Sean Bright <[email protected]>
 *
 * 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_session</depend>
    <support_level>core</support_level>
***/

#include "asterisk.h"

#include <pjsip.h>
#include <pjsip_ua.h>

#include "asterisk/features.h"
#include "asterisk/res_pjsip.h"
#include "asterisk/res_pjsip_session.h"
#include "asterisk/module.h"
#include "asterisk/features_config.h"

static void send_response(struct ast_sip_session *session, int code, struct pjsip_rx_data *rdata)
{
   pjsip_tx_data *tdata;

   if (pjsip_dlg_create_response(session->inv_session->dlg, rdata, code, NULL, &tdata) == PJ_SUCCESS) {
      struct pjsip_transaction *tsx = pjsip_rdata_get_tsx(rdata);

      pjsip_dlg_send_response(session->inv_session->dlg, tsx, tdata);
   }
}

static int handle_incoming_request(struct ast_sip_session *session, struct pjsip_rx_data *rdata)
{
   static const pj_str_t rec_str = { "Record", 6 };
   pjsip_generic_string_hdr *record;
   int feature_res;
   char feature_code[AST_FEATURE_MAX_LEN];
   const char *feature;
   char *digit;

   record = pjsip_msg_find_hdr_by_name(rdata->msg_info.msg, &rec_str, NULL);

   /* If we don't have Record header, we have nothing to do */
   if (!record) {
      return 0;
   }

   if (!pj_stricmp2(&record->hvalue, "on")) {
      feature = session->endpoint->info.recording.onfeature;
   } else if (!pj_stricmp2(&record->hvalue, "off")) {
      feature = session->endpoint->info.recording.offfeature;
   } else {
      /* Don't send response because another module may handle this */
      return 0;
   }

   if (!session->channel) {
      send_response(session, 481, rdata);
      return 1;
   }

   /* Is this endpoint configured with One Touch Recording? */
   if (!session->endpoint->info.recording.enabled || ast_strlen_zero(feature)) {
      send_response(session, 403, rdata);
      return 1;
   }

   ast_channel_lock(session->channel);
   feature_res = ast_get_feature(session->channel, feature, feature_code, sizeof(feature_code));
   ast_channel_unlock(session->channel);

   if (feature_res || ast_strlen_zero(feature_code)) {
      send_response(session, 403, rdata);
      return 1;
   }

   for (digit = feature_code; *digit; ++digit) {
      struct ast_frame f = { AST_FRAME_DTMF, .subclass.integer = *digit, .len = 100 };
      ast_queue_frame(session->channel, &f);
   }

   send_response(session, 200, rdata);

   return 1;
}

static struct ast_sip_session_supplement info_supplement = {
   .method = "INFO",
   .priority = AST_SIP_SUPPLEMENT_PRIORITY_FIRST,
   .incoming_request = handle_incoming_request,
};

static int load_module(void)
{
   ast_sip_session_register_supplement(&info_supplement);

   return AST_MODULE_LOAD_SUCCESS;
}

static int unload_module(void)
{
   ast_sip_session_unregister_supplement(&info_supplement);
   return 0;
}

AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_LOAD_ORDER, "PJSIP INFO One Touch Recording Support",
   .support_level = AST_MODULE_SUPPORT_CORE,
   .load = load_module,
   .unload = unload_module,
   .load_pri = AST_MODPRI_APP_DEPEND,
   .requires = "res_pjsip,res_pjsip_session",
);