resource_bridges.c

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/*
 * Asterisk -- An open source telephony toolkit.
 *
 * Copyright (C) 2012 - 2013, Digium, Inc.
 *
 * David M. Lee, II <[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.
 */

/*! \file
 *
 * \brief Implementation for ARI stubs.
 *
 * \author David M. Lee, II <[email protected]>
 */

/*** MODULEINFO
   <support_level>core</support_level>
 ***/

#include "asterisk.h"

#include "resource_bridges.h"
#include "asterisk/stasis.h"
#include "asterisk/stasis_bridges.h"
#include "asterisk/stasis_app.h"
#include "asterisk/stasis_app_impl.h"
#include "asterisk/stasis_app_playback.h"
#include "asterisk/stasis_app_recording.h"
#include "asterisk/stasis_channels.h"
#include "asterisk/core_unreal.h"
#include "asterisk/channel.h"
#include "asterisk/bridge.h"
#include "asterisk/format_cap.h"
#include "asterisk/file.h"
#include "asterisk/musiconhold.h"
#include "asterisk/format_cache.h"

/*!
 * \brief Finds a bridge, filling the response with an error, if appropriate.
 *
 * \param[out] response Response to fill with an error if control is not found.
 * \param bridge_id ID of the bridge to lookup.
 *
 * \return Bridget.
 * \return \c NULL if bridge does not exist.
 */
static struct ast_bridge *find_bridge(
   struct ast_ari_response *response,
   const char *bridge_id)
{
   RAII_VAR(struct ast_bridge *, bridge, NULL, ao2_cleanup);

   ast_assert(response != NULL);

   bridge = stasis_app_bridge_find_by_id(bridge_id);
   if (bridge == NULL) {
      RAII_VAR(struct ast_bridge_snapshot *, snapshot,
         ast_bridge_get_snapshot_by_uniqueid(bridge_id), ao2_cleanup);
      if (!snapshot) {
         ast_ari_response_error(response, 404, "Not found",
            "Bridge not found");
         return NULL;
      }

      ast_ari_response_error(response, 409, "Conflict",
         "Bridge not in Stasis application");
      return NULL;
   }

   ao2_ref(bridge, +1);
   return bridge;
}

/*!
 * \brief Finds the control object for a channel, filling the response with an
 * error, if appropriate.
 * \param[out] response Response to fill with an error if control is not found.
 * \param channel_id ID of the channel to lookup.
 * \return Channel control object.
 * \return \c NULL if control object does not exist.
 */
static struct stasis_app_control *find_channel_control(
   struct ast_ari_response *response,
   const char *channel_id)
{
   RAII_VAR(struct stasis_app_control *, control, NULL, ao2_cleanup);

   ast_assert(response != NULL);

   control = stasis_app_control_find_by_channel_id(channel_id);
   if (control == NULL) {
      /* Distinguish between 400 and 422 errors */
      RAII_VAR(struct ast_channel_snapshot *, snapshot, NULL,
         ao2_cleanup);
      snapshot = ast_channel_snapshot_get_latest(channel_id);
      if (snapshot == NULL) {
         ast_log(LOG_DEBUG, "Couldn't find '%s'\n", channel_id);
         ast_ari_response_error(response, 400, "Bad Request",
            "Channel not found");
         return NULL;
      }

      ast_log(LOG_DEBUG, "Found non-stasis '%s'\n", channel_id);
      ast_ari_response_error(response, 422, "Unprocessable Entity",
         "Channel not in Stasis application");
      return NULL;
   }

   ao2_ref(control, +1);
   return control;
}

struct control_list {
   size_t count;
   struct stasis_app_control *controls[];
};

static void control_list_dtor(void *obj) {
   struct control_list *list = obj;
   size_t i;

   for (i = 0; i < list->count; ++i) {
      ao2_cleanup(list->controls[i]);
      list->controls[i] = NULL;
   }
}

static struct control_list *control_list_create(struct ast_ari_response *response, size_t count, const char **channels) {
   RAII_VAR(struct control_list *, list, NULL, ao2_cleanup);
   size_t i;

   if (count == 0 || !channels) {
      ast_ari_response_error(response, 400, "Bad Request", "Missing parameter channel");
      return NULL;
   }

   list = ao2_alloc(sizeof(*list) + count * sizeof(list->controls[0]), control_list_dtor);
   if (!list) {
      ast_ari_response_alloc_failed(response);
      return NULL;
   }

   for (i = 0; i < count; ++i) {
      if (ast_strlen_zero(channels[i])) {
         continue;
      }
      list->controls[list->count] =
         find_channel_control(response, channels[i]);
      if (!list->controls[list->count]) {
         /* response filled in by find_channel_control() */
         return NULL;
      }
      ++list->count;
   }

   if (list->count == 0) {
      ast_ari_response_error(response, 400, "Bad Request", "Missing parameter channel");
      return NULL;
   }

   ao2_ref(list, +1);
   return list;
}

static int check_add_remove_channel(struct ast_ari_response *response,
                struct stasis_app_control *control,
                enum stasis_app_control_channel_result result)
{
   switch (result) {
   case STASIS_APP_CHANNEL_RECORDING :
      ast_ari_response_error(
         response, 409, "Conflict", "Channel %s currently recording",
         stasis_app_control_get_channel_id(control));
      return -1;
   case STASIS_APP_CHANNEL_OKAY:
      return 0;
   }
   return 0;
}

void ast_ari_bridges_add_channel(struct ast_variable *headers,
   struct ast_ari_bridges_add_channel_args *args,
   struct ast_ari_response *response)
{
   RAII_VAR(struct ast_bridge *, bridge, find_bridge(response, args->bridge_id), ao2_cleanup);
   RAII_VAR(struct control_list *, list, NULL, ao2_cleanup);
   size_t i;
   int has_error = 0;

   if (!bridge) {
      /* Response filled in by find_bridge() */
      return;
   }

   list = control_list_create(response, args->channel_count, args->channel);
   if (!list) {
      /* Response filled in by control_list_create() */
      return;
   }

   for (i = 0; i < list->count; ++i) {
      stasis_app_control_clear_roles(list->controls[i]);
      if (!ast_strlen_zero(args->role)) {
         if (stasis_app_control_add_role(list->controls[i], args->role)) {
            ast_ari_response_alloc_failed(response);
            return;
         }
      }

      /* Apply bridge features to each of the channel controls */
      if (!stasis_app_control_bridge_features_init(list->controls[i])) {
         stasis_app_control_absorb_dtmf_in_bridge(list->controls[i], args->absorb_dtmf);
         stasis_app_control_mute_in_bridge(list->controls[i], args->mute);
         stasis_app_control_inhibit_colp_in_bridge(list->controls[i], args->inhibit_connected_line_updates);
      }
   }

   for (i = 0; i < list->count; ++i) {
      if ((has_error = check_add_remove_channel(response, list->controls[i],
              stasis_app_control_add_channel_to_bridge(
                list->controls[i], bridge)))) {
         break;
      }
   }

   if (!has_error) {
      ast_ari_response_no_content(response);
   }
}

void ast_ari_bridges_remove_channel(struct ast_variable *headers,
   struct ast_ari_bridges_remove_channel_args *args,
   struct ast_ari_response *response)
{
   RAII_VAR(struct ast_bridge *, bridge, find_bridge(response, args->bridge_id), ao2_cleanup);
   RAII_VAR(struct control_list *, list, NULL, ao2_cleanup);
   size_t i;

   if (!bridge) {
      /* Response filled in by find_bridge() */
      return;
   }

   list = control_list_create(response, args->channel_count, args->channel);
   if (!list) {
      /* Response filled in by control_list_create() */
      return;
   }

   /* Make sure all of the channels are in this bridge */
   for (i = 0; i < list->count; ++i) {
      if (stasis_app_get_bridge(list->controls[i]) != bridge) {
         ast_log(LOG_WARNING, "Channel %s not in bridge %s\n",
            args->channel[i], args->bridge_id);
         ast_ari_response_error(response, 422,
            "Unprocessable Entity",
            "Channel not in this bridge");
         return;
      }
   }

   /* Now actually remove it */
   for (i = 0; i < list->count; ++i) {
      stasis_app_control_remove_channel_from_bridge(list->controls[i],
         bridge);
   }

   ast_ari_response_no_content(response);
}

struct bridge_channel_control_thread_data {
   struct ast_channel *bridge_channel;
   struct stasis_app_control *control;
   struct stasis_forward *forward;
   char bridge_id[0];
};

static void *bridge_channel_control_thread(void *data)
{
   struct bridge_channel_control_thread_data *thread_data = data;
   struct ast_channel *bridge_channel = thread_data->bridge_channel;
   struct stasis_app_control *control = thread_data->control;
   struct stasis_forward *forward = thread_data->forward;
   ast_callid callid = ast_channel_callid(bridge_channel);
   char *bridge_id = ast_strdupa(thread_data->bridge_id);

   if (callid) {
      ast_callid_threadassoc_add(callid);
   }

   ast_free(thread_data);
   thread_data = NULL;

   stasis_app_control_execute_until_exhausted(bridge_channel, control);
   stasis_app_control_flush_queue(control);

   stasis_app_bridge_playback_channel_remove(bridge_id, control);
   stasis_forward_cancel(forward);
   ao2_cleanup(control);
   ast_hangup(bridge_channel);
   return NULL;
}

static struct ast_channel *prepare_bridge_media_channel(const char *type)
{
   RAII_VAR(struct ast_format_cap *, cap, NULL, ao2_cleanup);
   struct ast_channel *chan;

   cap = ast_format_cap_alloc(AST_FORMAT_CAP_FLAG_DEFAULT);
   if (!cap) {
      return NULL;
   }

   ast_format_cap_append(cap, ast_format_slin, 0);

   chan = ast_request(type, cap, NULL, NULL, "ARI", NULL);
   if (!chan) {
      return NULL;
   }

   if (stasis_app_channel_unreal_set_internal(chan)) {
      ast_channel_cleanup(chan);
      return NULL;
   }
   return chan;
}

/*!
 * \brief Performs common setup for a bridge playback operation
 * with both new controls and when existing controls are  found.
 *
 * \param args_media medias to play
 * \param args_media_count number of media items in \c media
 * \param args_lang language string split from arguments
 * \param args_offset_ms milliseconds offset split from arguments
 * \param args_playback_id string to use for playback split from
 *        arguments (null valid)
 * \param response ARI response being built
 * \param bridge Bridge the playback is being peformed on
 * \param control Control being used for the playback channel
 * \param json contents of the response to ARI
 * \param playback_url stores playback URL for use with response
 *
 * \retval -1 operation failed
 * \retval operation was successful
 */
static int ari_bridges_play_helper(const char **args_media,
   size_t args_media_count,
   const char *args_lang,
   int args_offset_ms,
   int args_skipms,
   const char *args_playback_id,
   struct ast_ari_response *response,
   struct ast_bridge *bridge,
   struct stasis_app_control *control,
   struct ast_json **json,
   char **playback_url)
{
   RAII_VAR(struct ast_channel_snapshot *, snapshot, NULL, ao2_cleanup);
   RAII_VAR(struct stasis_app_playback *, playback, NULL, ao2_cleanup);

   const char *language;

   snapshot = stasis_app_control_get_snapshot(control);
   if (!snapshot) {
      ast_ari_response_error(
         response, 500, "Internal Error", "Failed to get control snapshot");
      return -1;
   }

   language = S_OR(args_lang, snapshot->base->language);

   playback = stasis_app_control_play_uri(control, args_media, args_media_count,
      language, bridge->uniqueid, STASIS_PLAYBACK_TARGET_BRIDGE, args_skipms,
      args_offset_ms, args_playback_id);

   if (!playback) {
      ast_ari_response_alloc_failed(response);
      return -1;
   }

   if (ast_asprintf(playback_url, "/playbacks/%s",
         stasis_app_playback_get_id(playback)) == -1) {
      ast_ari_response_alloc_failed(response);
      return -1;
   }

   *json = stasis_app_playback_to_json(playback);
   if (!*json) {
      ast_ari_response_alloc_failed(response);
      return -1;
   }

   return 0;
}

static void ari_bridges_play_new(const char **args_media,
   size_t args_media_count,
   const char *args_lang,
   int args_offset_ms,
   int args_skipms,
   const char *args_playback_id,
   struct ast_ari_response *response,
   struct ast_bridge *bridge)
{
   RAII_VAR(struct ast_channel *, play_channel, NULL, ast_hangup);
   RAII_VAR(struct stasis_app_control *, control, NULL, ao2_cleanup);
   RAII_VAR(struct ast_json *, json, NULL, ast_json_unref);
   RAII_VAR(struct stasis_forward *, channel_forward, NULL, stasis_forward_cancel);
   RAII_VAR(char *, playback_url, NULL, ast_free);

   struct stasis_topic *channel_topic;
   struct stasis_topic *bridge_topic;
   struct bridge_channel_control_thread_data *thread_data;
   pthread_t threadid;

   if (!(play_channel = prepare_bridge_media_channel("Announcer"))) {
      ast_ari_response_error(
         response, 500, "Internal Error", "Could not create playback channel");
      return;
   }
   ast_debug(1, "Created announcer channel '%s'\n", ast_channel_name(play_channel));

   bridge_topic = ast_bridge_topic(bridge);
   channel_topic = ast_channel_topic(play_channel);

   /* Forward messages from the playback channel topic to the bridge topic so that anything listening for
    * messages on the bridge topic will receive the playback start/stop messages. Other messages that would
    * go to this channel will be suppressed since the channel is marked as internal.
    */
   if (!bridge_topic || !channel_topic || !(channel_forward = stasis_forward_all(channel_topic, bridge_topic))) {
      ast_ari_response_error(
         response, 500, "Internal Error", "Could not forward playback channel stasis messages to bridge topic");
      return;
   }

   if (ast_unreal_channel_push_to_bridge(play_channel, bridge,
      AST_BRIDGE_CHANNEL_FLAG_IMMOVABLE | AST_BRIDGE_CHANNEL_FLAG_LONELY)) {
      ast_ari_response_error(
         response, 500, "Internal Error", "Failed to put playback channel into the bridge");
      return;
   }

   control = stasis_app_control_create(play_channel);
   if (control == NULL) {
      ast_ari_response_alloc_failed(response);
      return;
   }

   ao2_lock(control);
   if (ari_bridges_play_helper(args_media, args_media_count, args_lang,
         args_offset_ms, args_skipms, args_playback_id, response, bridge,
         control, &json, &playback_url)) {
      ao2_unlock(control);
      return;
   }
   ao2_unlock(control);

   if (stasis_app_bridge_playback_channel_add(bridge, play_channel, control)) {
      ast_ari_response_alloc_failed(response);
      return;
   }

   /* Give play_channel and control reference to the thread data */
   thread_data = ast_malloc(sizeof(*thread_data) + strlen(bridge->uniqueid) + 1);
   if (!thread_data) {
      stasis_app_bridge_playback_channel_remove((char *)bridge->uniqueid, control);
      ast_ari_response_alloc_failed(response);
      return;
   }

   thread_data->bridge_channel = play_channel;
   thread_data->control = control;
   thread_data->forward = channel_forward;
   /* Safe */
   strcpy(thread_data->bridge_id, bridge->uniqueid);

   if (ast_pthread_create_detached(&threadid, NULL, bridge_channel_control_thread, thread_data)) {
      stasis_app_bridge_playback_channel_remove((char *)bridge->uniqueid, control);
      ast_ari_response_alloc_failed(response);
      ast_free(thread_data);
      return;
   }

   /* These are owned by the other thread now, so we don't want RAII_VAR disposing of them. */
   play_channel = NULL;
   control = NULL;
   channel_forward = NULL;

   ast_ari_response_created(response, playback_url, ast_json_ref(json));
}

enum play_found_result {
   PLAY_FOUND_SUCCESS,
   PLAY_FOUND_FAILURE,
   PLAY_FOUND_CHANNEL_UNAVAILABLE,
};

/*!
 * \brief Performs common setup for a bridge playback operation
 * with both new controls and when existing controls are  found.
 *
 * \param args_media medias to play
 * \param args_media_count number of media items in \c media
 * \param args_lang language string split from arguments
 * \param args_offset_ms milliseconds offset split from arguments
 * \param args_playback_id string to use for playback split from
 *        arguments (null valid)
 * \param response ARI response being built
 * \param bridge Bridge the playback is being peformed on
 * \param found_channel The channel that was found controlling playback
 *
 * \retval PLAY_FOUND_SUCCESS The operation was successful
 * \retval PLAY_FOUND_FAILURE The operation failed (terminal failure)
 * \retval PLAY_FOUND_CHANNEL_UNAVAILABLE The operation failed because
 * the channel requested to playback with is breaking down.
 */
static enum play_found_result ari_bridges_play_found(const char **args_media,
   size_t args_media_count,
   const char *args_lang,
   int args_offset_ms,
   int args_skipms,
   const char *args_playback_id,
   struct ast_ari_response *response,
   struct ast_bridge *bridge,
   struct ast_channel *found_channel)
{
   RAII_VAR(struct ast_channel *, play_channel, found_channel, ao2_cleanup);
   RAII_VAR(struct stasis_app_control *, control, NULL, ao2_cleanup);
   RAII_VAR(char *, playback_url, NULL, ast_free);
   RAII_VAR(struct ast_json *, json, NULL, ast_json_unref);

   control = stasis_app_control_find_by_channel(play_channel);
   if (!control) {
      return PLAY_FOUND_CHANNEL_UNAVAILABLE;
   }

   ao2_lock(control);
   if (stasis_app_control_is_done(control)) {
      /* We failed to queue the action. Bailout and return that we aren't terminal. */
      ao2_unlock(control);
      return PLAY_FOUND_CHANNEL_UNAVAILABLE;
   }

   if (ari_bridges_play_helper(args_media, args_media_count,
         args_lang, args_offset_ms, args_skipms, args_playback_id,
         response, bridge, control, &json, &playback_url)) {
      ao2_unlock(control);
      return PLAY_FOUND_FAILURE;
   }
   ao2_unlock(control);

   ast_ari_response_created(response, playback_url, ast_json_ref(json));
   return PLAY_FOUND_SUCCESS;
}

static void ari_bridges_handle_play(
   const char *args_bridge_id,
   const char **args_media,
   size_t args_media_count,
   const char *args_lang,
   int args_offset_ms,
   int args_skipms,
   const char *args_playback_id,
   struct ast_ari_response *response)
{
   RAII_VAR(struct ast_bridge *, bridge, find_bridge(response, args_bridge_id), ao2_cleanup);
   struct ast_channel *play_channel;

   ast_assert(response != NULL);

   if (!bridge) {
      return;
   }

   while ((play_channel = stasis_app_bridge_playback_channel_find(bridge))) {
      /* If ari_bridges_play_found fails because the channel is unavailable for
       * playback, The channel will be removed from the playback list soon. We
       * can keep trying to get channels from the list until we either get one
       * that will work or else there isn't a channel for this bridge anymore,
       * in which case we'll revert to ari_bridges_play_new.
       */
      if (ari_bridges_play_found(args_media, args_media_count, args_lang,
            args_offset_ms, args_skipms, args_playback_id, response,bridge,
            play_channel) == PLAY_FOUND_CHANNEL_UNAVAILABLE) {
         continue;
      }
      return;
   }

   ari_bridges_play_new(args_media, args_media_count, args_lang, args_offset_ms,
      args_skipms, args_playback_id, response, bridge);
}


void ast_ari_bridges_play(struct ast_variable *headers,
   struct ast_ari_bridges_play_args *args,
   struct ast_ari_response *response)
{
   ari_bridges_handle_play(args->bridge_id,
   args->media,
   args->media_count,
   args->lang,
   args->offsetms,
   args->skipms,
   args->playback_id,
   response);
}

void ast_ari_bridges_play_with_id(struct ast_variable *headers,
   struct ast_ari_bridges_play_with_id_args *args,
   struct ast_ari_response *response)
{
   ari_bridges_handle_play(args->bridge_id,
   args->media,
   args->media_count,
   args->lang,
   args->offsetms,
   args->skipms,
   args->playback_id,
   response);
}

void ast_ari_bridges_record(struct ast_variable *headers,
   struct ast_ari_bridges_record_args *args,
   struct ast_ari_response *response)
{
   RAII_VAR(struct ast_bridge *, bridge, find_bridge(response, args->bridge_id), ao2_cleanup);
   RAII_VAR(struct ast_channel *, record_channel, NULL, ast_hangup);
   RAII_VAR(struct stasis_app_control *, control, NULL, ao2_cleanup);
   RAII_VAR(struct stasis_app_recording *, recording, NULL, ao2_cleanup);
   RAII_VAR(char *, recording_url, NULL, ast_free);
   RAII_VAR(struct ast_json *, json, NULL, ast_json_unref);
   RAII_VAR(struct stasis_app_recording_options *, options, NULL, ao2_cleanup);
   RAII_VAR(char *, uri_encoded_name, NULL, ast_free);
   RAII_VAR(struct stasis_forward *, channel_forward, NULL, stasis_forward_cancel);

   struct stasis_topic *channel_topic;
   struct stasis_topic *bridge_topic;
   size_t uri_name_maxlen;
   struct bridge_channel_control_thread_data *thread_data;
   pthread_t threadid;

   ast_assert(response != NULL);

   if (bridge == NULL) {
      return;
   }

   if (!(record_channel = prepare_bridge_media_channel("Recorder"))) {
      ast_ari_response_error(
         response, 500, "Internal Server Error", "Failed to create recording channel");
      return;
   }

   bridge_topic = ast_bridge_topic(bridge);
   channel_topic = ast_channel_topic(record_channel);

   /* Forward messages from the recording channel topic to the bridge topic so that anything listening for
    * messages on the bridge topic will receive the recording start/stop messages. Other messages that would
    * go to this channel will be suppressed since the channel is marked as internal.
    */
   if (!bridge_topic || !channel_topic || !(channel_forward = stasis_forward_all(channel_topic, bridge_topic))) {
      ast_ari_response_error(
         response, 500, "Internal Error", "Could not forward record channel stasis messages to bridge topic");
      return;
   }

   if (ast_unreal_channel_push_to_bridge(record_channel, bridge,
      AST_BRIDGE_CHANNEL_FLAG_IMMOVABLE | AST_BRIDGE_CHANNEL_FLAG_LONELY)) {
      ast_ari_response_error(
         response, 500, "Internal Error", "Failed to put recording channel into the bridge");
      return;
   }

   control = stasis_app_control_create(record_channel);
   if (control == NULL) {
      ast_ari_response_alloc_failed(response);
      return;
   }

   options = stasis_app_recording_options_create(args->name, args->format);
   if (options == NULL) {
      ast_ari_response_alloc_failed(response);
      return;
   }

   ast_string_field_build(options, target, "bridge:%s", args->bridge_id);
   options->max_silence_seconds = args->max_silence_seconds;
   options->max_duration_seconds = args->max_duration_seconds;
   options->terminate_on =
      stasis_app_recording_termination_parse(args->terminate_on);
   options->if_exists =
      stasis_app_recording_if_exists_parse(args->if_exists);
   options->beep = args->beep;

   if (options->terminate_on == STASIS_APP_RECORDING_TERMINATE_INVALID) {
      ast_ari_response_error(
         response, 400, "Bad Request",
         "terminateOn invalid");
      return;
   }

   if (options->if_exists == AST_RECORD_IF_EXISTS_ERROR) {
      ast_ari_response_error(
         response, 400, "Bad Request",
         "ifExists invalid");
      return;
   }

   if (!ast_get_format_for_file_ext(options->format)) {
      ast_ari_response_error(
         response, 422, "Unprocessable Entity",
         "specified format is unknown on this system");
      return;
   }

   recording = stasis_app_control_record(control, options);
   if (recording == NULL) {
      switch(errno) {
      case EINVAL:
         /* While the arguments are invalid, we should have
          * caught them prior to calling record.
          */
         ast_ari_response_error(
            response, 500, "Internal Server Error",
            "Error parsing request");
         break;
      case EEXIST:
         ast_ari_response_error(response, 409, "Conflict",
            "Recording '%s' already exists and can not be overwritten",
            args->name);
         break;
      case ENOMEM:
         ast_ari_response_alloc_failed(response);
         break;
      case EPERM:
         ast_ari_response_error(
            response, 400, "Bad Request",
            "Recording name invalid");
         break;
      default:
         ast_log(LOG_WARNING,
            "Unrecognized recording error: %s\n",
            strerror(errno));
         ast_ari_response_error(
            response, 500, "Internal Server Error",
            "Internal Server Error");
         break;
      }
      return;
   }

   uri_name_maxlen = strlen(args->name) * 3;
   uri_encoded_name = ast_malloc(uri_name_maxlen);
   if (!uri_encoded_name) {
      ast_ari_response_alloc_failed(response);
      return;
   }
   ast_uri_encode(args->name, uri_encoded_name, uri_name_maxlen, ast_uri_http);

   if (ast_asprintf(&recording_url, "/recordings/live/%s",
         uri_encoded_name) == -1) {
      recording_url = NULL;
      ast_ari_response_alloc_failed(response);
      return;
   }

   json = stasis_app_recording_to_json(recording);
   if (!json) {
      ast_ari_response_alloc_failed(response);
      return;
   }

   thread_data = ast_calloc(1, sizeof(*thread_data));
   if (!thread_data) {
      ast_ari_response_alloc_failed(response);
      return;
   }

   thread_data->bridge_channel = record_channel;
   thread_data->control = control;
   thread_data->forward = channel_forward;

   if (ast_pthread_create_detached(&threadid, NULL, bridge_channel_control_thread, thread_data)) {
      ast_ari_response_alloc_failed(response);
      ast_free(thread_data);
      return;
   }

   /* These are owned by the other thread now, so we don't want RAII_VAR disposing of them. */
   record_channel = NULL;
   control = NULL;
   channel_forward = NULL;

   ast_ari_response_created(response, recording_url, ast_json_ref(json));
}

void ast_ari_bridges_start_moh(struct ast_variable *headers,
   struct ast_ari_bridges_start_moh_args *args,
   struct ast_ari_response *response)
{
   RAII_VAR(struct ast_bridge *, bridge, find_bridge(response, args->bridge_id), ao2_cleanup);
   struct ast_channel *moh_channel;
   const char *moh_class = args->moh_class;

   if (!bridge) {
      /* The response is provided by find_bridge() */
      return;
   }

   moh_channel = stasis_app_bridge_moh_channel(bridge);
   if (!moh_channel) {
      ast_ari_response_alloc_failed(response);
      return;
   }

   ast_moh_start(moh_channel, moh_class, NULL);
   ast_channel_cleanup(moh_channel);

   ast_ari_response_no_content(response);

}

void ast_ari_bridges_stop_moh(struct ast_variable *headers,
   struct ast_ari_bridges_stop_moh_args *args,
   struct ast_ari_response *response)
{
   RAII_VAR(struct ast_bridge *, bridge, find_bridge(response, args->bridge_id), ao2_cleanup);

   if (!bridge) {
      /* the response is provided by find_bridge() */
      return;
   }

   if (stasis_app_bridge_moh_stop(bridge)) {
      ast_ari_response_error(
         response, 409, "Conflict",
         "Bridge isn't playing music");
      return;
   }

   ast_ari_response_no_content(response);
}

void ast_ari_bridges_get(struct ast_variable *headers,
   struct ast_ari_bridges_get_args *args,
   struct ast_ari_response *response)
{
   RAII_VAR(struct ast_bridge_snapshot *, snapshot, ast_bridge_get_snapshot_by_uniqueid(args->bridge_id), ao2_cleanup);
   if (!snapshot) {
      ast_ari_response_error(
         response, 404, "Not Found",
         "Bridge not found");
      return;
   }

   ast_ari_response_ok(response,
      ast_bridge_snapshot_to_json(snapshot, stasis_app_get_sanitizer()));
}

void ast_ari_bridges_destroy(struct ast_variable *headers,
   struct ast_ari_bridges_destroy_args *args,
   struct ast_ari_response *response)
{
   RAII_VAR(struct ast_bridge *, bridge, find_bridge(response, args->bridge_id), ao2_cleanup);
   if (!bridge) {
      return;
   }

   stasis_app_bridge_destroy(args->bridge_id);
   ast_ari_response_no_content(response);
}

void ast_ari_bridges_list(struct ast_variable *headers,
   struct ast_ari_bridges_list_args *args,
   struct ast_ari_response *response)
{
   RAII_VAR(struct ao2_container *, bridges, NULL, ao2_cleanup);
   RAII_VAR(struct ast_json *, json, NULL, ast_json_unref);
   struct ao2_iterator i;
   struct ast_bridge *bridge;

   bridges = ast_bridges();
   if (!bridges) {
      ast_ari_response_alloc_failed(response);
      return;
   }

   json = ast_json_array_create();
   if (!json) {
      ast_ari_response_alloc_failed(response);
      return;
   }

   i = ao2_iterator_init(bridges, 0);
   while ((bridge = ao2_iterator_next(&i))) {
      struct ast_bridge_snapshot *snapshot = ast_bridge_get_snapshot(bridge);
      /* ast_bridge_snapshot_to_json will return NULL if snapshot is NULL */
      struct ast_json *json_bridge = ast_bridge_snapshot_to_json(snapshot, stasis_app_get_sanitizer());

      ao2_ref(bridge, -1);
      ao2_cleanup(snapshot);
      if (!json_bridge || ast_json_array_append(json, json_bridge)) {
         ao2_iterator_destroy(&i);
         ast_ari_response_alloc_failed(response);
         return;
      }
   }
   ao2_iterator_destroy(&i);

   ast_ari_response_ok(response, ast_json_ref(json));
}

void ast_ari_bridges_create(struct ast_variable *headers,
   struct ast_ari_bridges_create_args *args,
   struct ast_ari_response *response)
{
   RAII_VAR(struct ast_bridge *, bridge, stasis_app_bridge_create(args->type, args->name, args->bridge_id), ao2_cleanup);
   RAII_VAR(struct ast_bridge_snapshot *, snapshot, NULL, ao2_cleanup);

   if (!bridge) {
      ast_ari_response_error(
         response, 500, "Internal Error",
         "Unable to create bridge");
      return;
   }

   ast_bridge_lock(bridge);
   snapshot = ast_bridge_snapshot_create(bridge);
   ast_bridge_unlock(bridge);

   if (!snapshot) {
      ast_ari_response_error(
         response, 500, "Internal Error",
         "Unable to create snapshot for new bridge");
      return;
   }

   ast_ari_response_ok(response,
      ast_bridge_snapshot_to_json(snapshot, stasis_app_get_sanitizer()));
}

void ast_ari_bridges_create_with_id(struct ast_variable *headers,
   struct ast_ari_bridges_create_with_id_args *args,
   struct ast_ari_response *response)
{
   RAII_VAR(struct ast_bridge *, bridge, find_bridge(response, args->bridge_id), ao2_cleanup);
   RAII_VAR(struct ast_bridge_snapshot *, snapshot, NULL, ao2_cleanup);

   if (bridge) {
      /* update */
      if (!ast_strlen_zero(args->name)
         && strcmp(args->name, bridge->name)) {
         ast_ari_response_error(
            response, 500, "Internal Error",
            "Changing bridge name is not implemented");
         return;
      }
      if (!ast_strlen_zero(args->type)) {
         ast_ari_response_error(
            response, 500, "Internal Error",
            "Supplying a bridge type when updating a bridge is not allowed.");
         return;
      }
      ast_ari_response_ok(response,
         ast_bridge_snapshot_to_json(snapshot, stasis_app_get_sanitizer()));
      return;
   }

   bridge = stasis_app_bridge_create(args->type, args->name, args->bridge_id);
   if (!bridge) {
      ast_ari_response_error(
         response, 500, "Internal Error",
         "Unable to create bridge");
      return;
   }

   ast_bridge_lock(bridge);
   snapshot = ast_bridge_snapshot_create(bridge);
   ast_bridge_unlock(bridge);

   if (!snapshot) {
      ast_ari_response_error(
         response, 500, "Internal Error",
         "Unable to create snapshot for new bridge");
      return;
   }

   ast_ari_response_ok(response,
      ast_bridge_snapshot_to_json(snapshot, stasis_app_get_sanitizer()));
}

static int bridge_set_video_source_cb(struct stasis_app_control *control,
   struct ast_channel *chan, void *data)
{
   struct ast_bridge *bridge = data;

   ast_bridge_lock(bridge);
   ast_bridge_set_single_src_video_mode(bridge, chan);
   ast_bridge_unlock(bridge);

   return 0;
}

void ast_ari_bridges_set_video_source(struct ast_variable *headers,
   struct ast_ari_bridges_set_video_source_args *args, struct ast_ari_response *response)
{
   struct ast_bridge *bridge;
   struct stasis_app_control *control;

   bridge = find_bridge(response, args->bridge_id);
   if (!bridge) {
      return;
   }

   control = find_channel_control(response, args->channel_id);
   if (!control) {
      ao2_ref(bridge, -1);
      return;
   }

   if (stasis_app_get_bridge(control) != bridge) {
      ast_ari_response_error(response, 422,
         "Unprocessable Entity",
         "Channel not in this bridge");
      ao2_ref(bridge, -1);
      ao2_ref(control, -1);
      return;
   }

   stasis_app_send_command(control, bridge_set_video_source_cb,
      ao2_bump(bridge), __ao2_cleanup);

   ao2_ref(bridge, -1);
   ao2_ref(control, -1);

   ast_ari_response_no_content(response);
}

void ast_ari_bridges_clear_video_source(struct ast_variable *headers,
   struct ast_ari_bridges_clear_video_source_args *args, struct ast_ari_response *response)
{
   struct ast_bridge *bridge;

   bridge = find_bridge(response, args->bridge_id);
   if (!bridge) {
      return;
   }

   ast_bridge_lock(bridge);
   ast_bridge_set_talker_src_video_mode(bridge);
   ast_bridge_unlock(bridge);

   ao2_ref(bridge, -1);
   ast_ari_response_no_content(response);
}