resource_channels.c

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/*
 * Asterisk -- An open source telephony toolkit.
 *
 * Copyright (C) 2012 - 2013, Digium, Inc.
 *
 * David M. Lee, II <dlee@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.
 */
 
/*! \file
 *
 * \brief Implementation for ARI stubs.
 *
 * \author David M. Lee, II <dlee@digium.com>
 */
 
/*** MODULEINFO
    <support_level>core</support_level>
 ***/
 
#include "asterisk.h"
 
#include "asterisk/file.h"
#include "asterisk/pbx.h"
#include "asterisk/bridge.h"
#include "asterisk/callerid.h"
#include "asterisk/stasis_app.h"
#include "asterisk/stasis_app_playback.h"
#include "asterisk/stasis_app_recording.h"
#include "asterisk/stasis_app_snoop.h"
#include "asterisk/stasis_channels.h"
#include "asterisk/causes.h"
#include "asterisk/format_cache.h"
#include "asterisk/core_local.h"
#include "asterisk/dial.h"
#include "asterisk/max_forwards.h"
#include "asterisk/rtp_engine.h"
#include "asterisk/websocket_client.h"
#include "resource_channels.h"
 
#include <limits.h>
 
 
/*! \brief Return the corresponded hangup code of the given reason */
static int convert_reason_to_hangup_code(const char* reason)
{
    if (!strcmp(reason, "normal")) {
        return AST_CAUSE_NORMAL;
    } else if (!strcmp(reason, "busy")) {
        return AST_CAUSE_BUSY;
    } else if (!strcmp(reason, "congestion")) {
        return AST_CAUSE_CONGESTION;
    } else if (!strcmp(reason, "no_answer")) {
        return AST_CAUSE_NOANSWER;
    } else if (!strcmp(reason, "timeout")) {
        return AST_CAUSE_NO_USER_RESPONSE;
    } else if (!strcmp(reason, "rejected")) {
        return AST_CAUSE_CALL_REJECTED;
    } else if (!strcmp(reason, "unallocated")) {
        return AST_CAUSE_UNALLOCATED;
    } else if (!strcmp(reason, "normal_unspecified")) {
        return AST_CAUSE_NORMAL_UNSPECIFIED;
    } else if (!strcmp(reason, "number_incomplete")) {
        return AST_CAUSE_INVALID_NUMBER_FORMAT;
    } else if (!strcmp(reason, "codec_mismatch")) {
        return AST_CAUSE_BEARERCAPABILITY_NOTAVAIL;
    } else if (!strcmp(reason, "interworking")) {
        return AST_CAUSE_INTERWORKING;
    } else if (!strcmp(reason, "failure")) {
        return AST_CAUSE_FAILURE;
    } else if(!strcmp(reason, "answered_elsewhere")) {
        return AST_CAUSE_ANSWERED_ELSEWHERE;
    }
 
    return -1;
}
 
/*!
 * \brief Ensure channel is in a state that allows operation to be performed.
 *
 * Since Asterisk 14, it has been possible for down channels, as well as unanswered
 * outbound channels to enter Stasis. While some operations are fine to perform on
 * such channels, operations that
 *
 * - Attempt to manipulate channel state
 * - Attempt to play media
 * - Attempt to control the channel's location in the dialplan
 *
 * are invalid. This function can be used to determine if the channel is in an
 * appropriate state.
 *
 * \note When this function returns an error, the HTTP response is taken care of.
 *
 * \param control The app control
 * \param response Response to fill in if there is an error
 *
 * \retval 0 Channel is in a valid state. Continue on!
 * \retval non-zero Channel is in an invalid state. Bail!
 */
static int channel_state_invalid(struct stasis_app_control *control,
    struct ast_ari_response *response)
{
    struct ast_channel_snapshot *snapshot;
 
    snapshot = stasis_app_control_get_snapshot(control);
    if (!snapshot) {
        ast_ari_response_error(response, 404, "Not Found", "Channel not found");
        return -1;
    }
 
    /* These channel states apply only to outbound channels:
     * - Down: Channel has been created, and nothing else has been done
     * - Reserved: For a PRI, an underlying B-channel is reserved,
     *   but the channel is not yet dialed
     * - Ringing: The channel has been dialed.
     *
     * This does not affect inbound channels. Inbound channels, when they
     * enter the dialplan, are in the "Ring" state. If they have already
     * been answered, then they are in the "Up" state.
     */
    if (snapshot->state == AST_STATE_DOWN
        || snapshot->state == AST_STATE_RESERVED
        || snapshot->state == AST_STATE_RINGING) {
        ast_ari_response_error(response, 412, "Precondition Failed",
            "Channel in invalid state");
        ao2_ref(snapshot, -1);
 
        return -1;
    }
 
    ao2_ref(snapshot, -1);
 
    return 0;
}
 
/*!
 * \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.
 * \retval NULL if control object does not exist.
 */
static struct stasis_app_control *find_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 404 and 409 errors */
        RAII_VAR(struct ast_channel *, chan, NULL, ao2_cleanup);
        chan = ast_channel_get_by_name(channel_id);
        if (chan == NULL) {
            ast_ari_response_error(response, 404, "Not Found",
                   "Channel not found");
            return NULL;
        }
 
        ast_ari_response_error(response, 409, "Conflict",
               "Channel not in Stasis application");
        return NULL;
    }
 
    ao2_ref(control, +1);
    return control;
}
 
void ast_ari_channels_continue_in_dialplan(
    struct ast_variable *headers,
    struct ast_ari_channels_continue_in_dialplan_args *args,
    struct ast_ari_response *response)
{
    RAII_VAR(struct stasis_app_control *, control, NULL, ao2_cleanup);
    RAII_VAR(struct ast_channel_snapshot *, snapshot, NULL, ao2_cleanup);
    int ipri;
    const char *context;
    const char *exten;
 
    ast_assert(response != NULL);
 
    control = find_control(response, args->channel_id);
    if (control == NULL) {
        return;
    }
 
    if (channel_state_invalid(control, response)) {
        return;
    }
 
    snapshot = stasis_app_control_get_snapshot(control);
    if (!snapshot) {
        ast_ari_response_error(response, 404, "Not Found", "Channel not found");
        return;
    }
 
    if (ast_strlen_zero(args->context)) {
        context = snapshot->dialplan->context;
        exten = S_OR(args->extension, snapshot->dialplan->exten);
    } else {
        context = args->context;
        exten = S_OR(args->extension, "s");
    }
 
    if (!ast_strlen_zero(args->label)) {
        /* A label was provided in the request, use that */
 
        if (sscanf(args->label, "%30d", &ipri) != 1) {
            ipri = ast_findlabel_extension(NULL, context, exten, args->label, NULL);
            if (ipri == -1) {
                ast_log(AST_LOG_ERROR, "Requested label: %s can not be found in context: %s\n", args->label, context);
                ast_ari_response_error(response, 404, "Not Found", "Requested label can not be found");
                return;
            }
        } else {
            ast_debug(3, "Numeric value provided for label, jumping to that priority\n");
        }
 
        if (ipri == 0) {
            ast_log(AST_LOG_ERROR, "Invalid priority label '%s' specified for extension %s in context: %s\n",
                    args->label, exten, context);
            ast_ari_response_error(response, 400, "Bad Request", "Requested priority is illegal");
            return;
        }
 
    } else if (args->priority) {
        /* No label provided, use provided priority */
        ipri = args->priority;
    } else if (ast_strlen_zero(args->context) && ast_strlen_zero(args->extension)) {
        /* Special case. No exten, context, or priority provided, then move on to the next priority */
        ipri = snapshot->dialplan->priority + 1;
    } else {
        ipri = 1;
    }
 
 
    if (stasis_app_control_continue(control, context, exten, ipri)) {
        ast_ari_response_alloc_failed(response);
        return;
    }
 
    ast_ari_response_no_content(response);
}
 
void ast_ari_channels_move(struct ast_variable *headers,
    struct ast_ari_channels_move_args *args,
    struct ast_ari_response *response)
{
    RAII_VAR(struct stasis_app_control *, control, NULL, ao2_cleanup);
 
    control = find_control(response, args->channel_id);
    if (!control) {
        return;
    }
 
    if (stasis_app_control_move(control, args->app, args->app_args)) {
        ast_ari_response_error(response, 500, "Internal Server Error",
            "Failed to switch Stasis applications");
        return;
    }
 
    ast_ari_response_no_content(response);
}
 
void ast_ari_channels_redirect(struct ast_variable *headers,
    struct ast_ari_channels_redirect_args *args,
    struct ast_ari_response *response)
{
    RAII_VAR(struct stasis_app_control *, control, NULL, ao2_cleanup);
    RAII_VAR(struct ast_channel_snapshot *, chan_snapshot, NULL, ao2_cleanup);
    char *tech;
    char *resource;
    int tech_len;
 
    control = find_control(response, args->channel_id);
    if (!control) {
        return;
    }
 
    if (channel_state_invalid(control, response)) {
        return;
    }
 
    if (ast_strlen_zero(args->endpoint)) {
        ast_ari_response_error(response, 400, "Not Found",
            "Required parameter 'endpoint' not provided.");
        return;
    }
 
    tech = ast_strdupa(args->endpoint);
    if (!(resource = strchr(tech, '/')) || !(tech_len = resource - tech)) {
        ast_ari_response_error(response, 422, "Unprocessable Entity",
            "Endpoint parameter '%s' does not contain tech/resource", args->endpoint);
        return;
    }
 
    *resource++ = '\0';
    if (ast_strlen_zero(resource)) {
        ast_ari_response_error(response, 422, "Unprocessable Entity",
            "No resource provided in endpoint parameter '%s'", args->endpoint);
        return;
    }
 
    chan_snapshot = ast_channel_snapshot_get_latest(args->channel_id);
    if (!chan_snapshot) {
        ast_ari_response_error(response, 500, "Internal Server Error",
            "Unable to find channel snapshot for '%s'", args->channel_id);
        return;
    }
 
    if (strncasecmp(chan_snapshot->base->type, tech, tech_len)) {
        ast_ari_response_error(response, 422, "Unprocessable Entity",
            "Endpoint technology '%s' does not match channel technology '%s'",
            tech, chan_snapshot->base->type);
        return;
    }
 
    if (stasis_app_control_redirect(control, resource)) {
        ast_ari_response_error(response, 500, "Internal Server Error",
            "Failed to redirect channel");
        return;
    }
 
    ast_ari_response_no_content(response);
}
 
void ast_ari_channels_answer(struct ast_variable *headers,
    struct ast_ari_channels_answer_args *args,
    struct ast_ari_response *response)
{
    RAII_VAR(struct stasis_app_control *, control, NULL, ao2_cleanup);
 
    control = find_control(response, args->channel_id);
    if (control == NULL) {
        return;
    }
 
    if (channel_state_invalid(control, response)) {
        return;
    }
 
    if (stasis_app_control_answer(control) != 0) {
        ast_ari_response_error(
            response, 500, "Internal Server Error",
            "Failed to answer channel");
        return;
    }
 
    ast_ari_response_no_content(response);
}
 
void ast_ari_channels_ring(struct ast_variable *headers,
    struct ast_ari_channels_ring_args *args,
    struct ast_ari_response *response)
{
    RAII_VAR(struct stasis_app_control *, control, NULL, ao2_cleanup);
 
    control = find_control(response, args->channel_id);
    if (control == NULL) {
        return;
    }
 
    if (channel_state_invalid(control, response)) {
        return;
    }
 
    stasis_app_control_ring(control);
 
    ast_ari_response_no_content(response);
}
 
void ast_ari_channels_ring_stop(struct ast_variable *headers,
    struct ast_ari_channels_ring_stop_args *args,
    struct ast_ari_response *response)
{
    RAII_VAR(struct stasis_app_control *, control, NULL, ao2_cleanup);
 
    control = find_control(response, args->channel_id);
    if (control == NULL) {
        return;
    }
 
    if (channel_state_invalid(control, response)) {
        return;
    }
 
    stasis_app_control_ring_stop(control);
 
    ast_ari_response_no_content(response);
}
 
void ast_ari_channels_progress(struct ast_variable *headers,
    struct ast_ari_channels_progress_args *args,
    struct ast_ari_response *response)
{
    RAII_VAR(struct stasis_app_control *, control, NULL, ao2_cleanup);
 
    control = find_control(response, args->channel_id);
    if (control == NULL) {
        return;
    }
 
    if (channel_state_invalid(control, response)) {
        return;
    }
 
    stasis_app_control_progress(control);
 
    ast_ari_response_no_content(response);
}
 
void ast_ari_channels_mute(struct ast_variable *headers,
    struct ast_ari_channels_mute_args *args,
    struct ast_ari_response *response)
{
    RAII_VAR(struct stasis_app_control *, control, NULL, ao2_cleanup);
    unsigned int direction = 0;
    enum ast_frame_type frametype = AST_FRAME_VOICE;
 
    control = find_control(response, args->channel_id);
    if (control == NULL) {
        return;
    }
 
    if (channel_state_invalid(control, response)) {
        return;
    }
 
    if (ast_strlen_zero(args->direction)) {
        ast_ari_response_error(
            response, 400, "Bad Request",
            "Direction is required");
        return;
    }
 
    if (!strcmp(args->direction, "in")) {
        direction = AST_MUTE_DIRECTION_READ;
    } else if (!strcmp(args->direction, "out")) {
        direction = AST_MUTE_DIRECTION_WRITE;
    } else if (!strcmp(args->direction, "both")) {
        direction = AST_MUTE_DIRECTION_READ | AST_MUTE_DIRECTION_WRITE;
    } else {
        ast_ari_response_error(
            response, 400, "Bad Request",
            "Invalid direction specified");
        return;
    }
 
    stasis_app_control_mute(control, direction, frametype);
 
    ast_ari_response_no_content(response);
}
 
void ast_ari_channels_unmute(struct ast_variable *headers,
    struct ast_ari_channels_unmute_args *args,
    struct ast_ari_response *response)
{
    RAII_VAR(struct stasis_app_control *, control, NULL, ao2_cleanup);
    unsigned int direction = 0;
    enum ast_frame_type frametype = AST_FRAME_VOICE;
 
    control = find_control(response, args->channel_id);
    if (control == NULL) {
        return;
    }
 
    if (channel_state_invalid(control, response)) {
        return;
    }
 
    if (ast_strlen_zero(args->direction)) {
        ast_ari_response_error(
            response, 400, "Bad Request",
            "Direction is required");
        return;
    }
 
    if (!strcmp(args->direction, "in")) {
        direction = AST_MUTE_DIRECTION_READ;
    } else if (!strcmp(args->direction, "out")) {
        direction = AST_MUTE_DIRECTION_WRITE;
    } else if (!strcmp(args->direction, "both")) {
        direction = AST_MUTE_DIRECTION_READ | AST_MUTE_DIRECTION_WRITE;
    } else {
        ast_ari_response_error(
            response, 400, "Bad Request",
            "Invalid direction specified");
        return;
    }
 
    stasis_app_control_unmute(control, direction, frametype);
 
    ast_ari_response_no_content(response);
}
 
void ast_ari_channels_send_dtmf(struct ast_variable *headers,
    struct ast_ari_channels_send_dtmf_args *args,
    struct ast_ari_response *response)
{
    RAII_VAR(struct stasis_app_control *, control, NULL, ao2_cleanup);
 
    control = find_control(response, args->channel_id);
    if (control == NULL) {
        return;
    }
 
    if (channel_state_invalid(control, response)) {
        return;
    }
 
    if (ast_strlen_zero(args->dtmf)) {
        ast_ari_response_error(
            response, 400, "Bad Request",
            "DTMF is required");
        return;
    }
 
    stasis_app_control_dtmf(control, args->dtmf, args->before, args->between, args->duration, args->after);
 
    ast_ari_response_no_content(response);
}
 
void ast_ari_channels_hold(struct ast_variable *headers,
    struct ast_ari_channels_hold_args *args,
    struct ast_ari_response *response)
{
    RAII_VAR(struct stasis_app_control *, control, NULL, ao2_cleanup);
 
    control = find_control(response, args->channel_id);
    if (control == NULL) {
        /* Response filled in by find_control */
        return;
    }
 
    if (channel_state_invalid(control, response)) {
        return;
    }
 
    stasis_app_control_hold(control);
 
    ast_ari_response_no_content(response);
}
 
void ast_ari_channels_unhold(struct ast_variable *headers,
    struct ast_ari_channels_unhold_args *args,
    struct ast_ari_response *response)
{
    RAII_VAR(struct stasis_app_control *, control, NULL, ao2_cleanup);
 
    control = find_control(response, args->channel_id);
    if (control == NULL) {
        /* Response filled in by find_control */
        return;
    }
 
    if (channel_state_invalid(control, response)) {
        return;
    }
 
    stasis_app_control_unhold(control);
 
    ast_ari_response_no_content(response);
}
 
void ast_ari_channels_start_moh(struct ast_variable *headers,
    struct ast_ari_channels_start_moh_args *args,
    struct ast_ari_response *response)
{
    RAII_VAR(struct stasis_app_control *, control, NULL, ao2_cleanup);
 
    control = find_control(response, args->channel_id);
    if (control == NULL) {
        /* Response filled in by find_control */
        return;
    }
 
    if (channel_state_invalid(control, response)) {
        return;
    }
 
    stasis_app_control_moh_start(control, args->moh_class);
    ast_ari_response_no_content(response);
}
 
void ast_ari_channels_stop_moh(struct ast_variable *headers,
    struct ast_ari_channels_stop_moh_args *args,
    struct ast_ari_response *response)
{
    RAII_VAR(struct stasis_app_control *, control, NULL, ao2_cleanup);
 
    control = find_control(response, args->channel_id);
    if (control == NULL) {
        /* Response filled in by find_control */
        return;
    }
 
    if (channel_state_invalid(control, response)) {
        return;
    }
 
    stasis_app_control_moh_stop(control);
    ast_ari_response_no_content(response);
}
 
void ast_ari_channels_start_silence(struct ast_variable *headers,
    struct ast_ari_channels_start_silence_args *args,
    struct ast_ari_response *response)
{
    RAII_VAR(struct stasis_app_control *, control, NULL, ao2_cleanup);
 
    control = find_control(response, args->channel_id);
    if (control == NULL) {
        /* Response filled in by find_control */
        return;
    }
 
    if (channel_state_invalid(control, response)) {
        return;
    }
 
    stasis_app_control_silence_start(control);
    ast_ari_response_no_content(response);
}
 
void ast_ari_channels_stop_silence(struct ast_variable *headers,
    struct ast_ari_channels_stop_silence_args *args,
    struct ast_ari_response *response)
{
    RAII_VAR(struct stasis_app_control *, control, NULL, ao2_cleanup);
 
    control = find_control(response, args->channel_id);
    if (control == NULL) {
        /* Response filled in by find_control */
        return;
    }
 
    if (channel_state_invalid(control, response)) {
        return;
    }
 
    stasis_app_control_silence_stop(control);
    ast_ari_response_no_content(response);
}
 
static void ari_channels_handle_play(
    const char *args_channel_id,
    const char **args_media,
    size_t args_media_count,
    const char *args_lang,
    int args_offsetms,
    int args_skipms,
    const char *args_playback_id,
    struct ast_ari_response *response)
{
    RAII_VAR(struct stasis_app_control *, control, NULL, ao2_cleanup);
    RAII_VAR(struct ast_channel_snapshot *, snapshot, NULL, ao2_cleanup);
    RAII_VAR(struct stasis_app_playback *, playback, NULL, ao2_cleanup);
    RAII_VAR(char *, playback_url, NULL, ast_free);
    struct ast_json *json;
    const char *language;
 
    ast_assert(response != NULL);
 
    control = find_control(response, args_channel_id);
    if (control == NULL) {
        /* Response filled in by find_control */
        return;
    }
 
    if (channel_state_invalid(control, response)) {
        return;
    }
 
    snapshot = stasis_app_control_get_snapshot(control);
    if (!snapshot) {
        ast_ari_response_error(
            response, 404, "Not Found",
            "Channel not found");
        return;
    }
 
    if (args_skipms < 0) {
        ast_ari_response_error(
            response, 400, "Bad Request",
            "skipms cannot be negative");
        return;
    }
 
    if (args_offsetms < 0) {
        ast_ari_response_error(
            response, 400, "Bad Request",
            "offsetms cannot be negative");
        return;
    }
 
    language = S_OR(args_lang, snapshot->base->language);
 
    playback = stasis_app_control_play_uri(control, args_media, args_media_count, language,
        args_channel_id, STASIS_PLAYBACK_TARGET_CHANNEL, args_skipms, args_offsetms, args_playback_id);
    if (!playback) {
        ast_ari_response_error(
            response, 500, "Internal Server Error",
            "Failed to queue media for playback");
        return;
    }
 
    if (ast_asprintf(&playback_url, "/playbacks/%s",
            stasis_app_playback_get_id(playback)) == -1) {
        playback_url = NULL;
        ast_ari_response_error(
            response, 500, "Internal Server Error",
            "Out of memory");
        return;
    }
 
    json = stasis_app_playback_to_json(playback);
    if (!json) {
        ast_ari_response_error(
            response, 500, "Internal Server Error",
            "Out of memory");
        return;
    }
 
    ast_ari_response_created(response, playback_url, json);
}
 
void ast_ari_channels_play(struct ast_variable *headers,
    struct ast_ari_channels_play_args *args,
    struct ast_ari_response *response)
{
    ari_channels_handle_play(
        args->channel_id,
        args->media,
        args->media_count,
        args->lang,
        args->offsetms,
        args->skipms,
        args->playback_id,
        response);
}
 
void ast_ari_channels_play_with_id(struct ast_variable *headers,
    struct ast_ari_channels_play_with_id_args *args,
    struct ast_ari_response *response)
{
    ari_channels_handle_play(
        args->channel_id,
        args->media,
        args->media_count,
        args->lang,
        args->offsetms,
        args->skipms,
        args->playback_id,
        response);
}
 
void ast_ari_channels_record(struct ast_variable *headers,
    struct ast_ari_channels_record_args *args,
    struct ast_ari_response *response)
{
    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);
    struct ast_json *json;
    RAII_VAR(struct stasis_app_recording_options *, options, NULL,
        ao2_cleanup);
    RAII_VAR(char *, uri_encoded_name, NULL, ast_free);
    size_t uri_name_maxlen;
 
    ast_assert(response != NULL);
 
    if (args->max_duration_seconds < 0) {
        ast_ari_response_error(
            response, 400, "Bad Request",
            "max_duration_seconds cannot be negative");
        return;
    }
 
    if (args->max_silence_seconds < 0) {
        ast_ari_response_error(
            response, 400, "Bad Request",
            "max_silence_seconds cannot be negative");
        return;
    }
 
    control = find_control(response, args->channel_id);
    if (control == NULL) {
        /* Response filled in by find_control */
        return;
    }
 
    options = stasis_app_recording_options_create(args->name, args->format);
    if (options == NULL) {
        ast_ari_response_error(
            response, 500, "Internal Server Error",
            "Out of memory");
    }
    ast_string_field_build(options, target, "channel:%s", args->channel_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_error(
                response, 500, "Internal Server Error",
                "Out of memory");
            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_error(
            response, 500, "Internal Server Error",
            "Out of memory");
        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_error(
            response, 500, "Internal Server Error",
            "Out of memory");
        return;
    }
 
    json = stasis_app_recording_to_json(recording);
    if (!json) {
        ast_ari_response_error(
            response, 500, "Internal Server Error",
            "Out of memory");
        return;
    }
 
    ast_ari_response_created(response, recording_url, json);
}
 
void ast_ari_channels_get(struct ast_variable *headers,
    struct ast_ari_channels_get_args *args,
    struct ast_ari_response *response)
{
    struct ast_channel_snapshot *snapshot;
 
    snapshot = ast_channel_snapshot_get_latest(args->channel_id);
    if (!snapshot) {
        ast_ari_response_error(
            response, 404, "Not Found",
            "Channel not found");
        return;
    }
 
    ast_ari_response_ok(response,
                ast_channel_snapshot_to_json(snapshot, NULL));
    ao2_ref(snapshot, -1);
}
 
void ast_ari_channels_hangup(struct ast_variable *headers,
    struct ast_ari_channels_hangup_args *args,
    struct ast_ari_response *response)
{
    RAII_VAR(struct ast_channel *, chan, NULL, ao2_cleanup);
    int cause;
    struct ast_rtp_glue *glue;
    struct ast_rtp_instance *rtp = NULL;
    const struct ast_channel_tech *tech;
 
    chan = ast_channel_get_by_name(args->channel_id);
    if (chan == NULL) {
        ast_ari_response_error(
            response, 404, "Not Found",
            "Channel not found");
        return;
    }
 
    if (!ast_strlen_zero(args->reason) && !ast_strlen_zero(args->reason_code)) {
        ast_ari_response_error(response, 400, "Bad Request",
            "The reason and reason_code can't both be specified");
        return;
    }
 
    if (!ast_strlen_zero(args->reason_code)) {
        /* reason_code allows any hangup code */
        if (sscanf(args->reason_code, "%30d", &cause) != 1) {
            ast_ari_response_error(
                response, 400, "Invalid Reason Code",
                "Invalid reason for hangup reason code provided");
            return;
        }
    } else if (!ast_strlen_zero(args->reason)) {
        /* reason allows only listed hangup reason */
        cause = convert_reason_to_hangup_code(args->reason);
        if (cause == -1) {
            ast_ari_response_error(
                response, 400, "Invalid Reason",
                "Invalid reason for hangup reason provided");
            return;
        }
    } else {
        /* not specified. set default hangup */
        cause = AST_CAUSE_NORMAL;
    }
 
    ast_channel_hangupcause_set(chan, cause);
 
    /*
     * Only hold the channel lock long enough to get the rtp instance.
     * glue->get_rtp_info() will bump the refcount on it.
     */
    ast_channel_lock(chan);
    tech = ast_channel_tech(chan);
    glue = ast_rtp_instance_get_glue(tech->type);
    if (glue) {
        glue->get_rtp_info(chan, &rtp);
    }
    ast_channel_unlock(chan);
    /*
     * If this channel is in a bridge, ast_rtp_instance_set_stats_vars() will
     * attempt to lock the bridge peer as well as this channel.  This can cause
     * a lock inversion if we already have this channel locked and another
     * thread tries to set bridge variables on the peer because it will have
     * locked the peer first, then this channel.  For this reason, we must
     * NOT have the channel locked when we call ast_rtp_instance_set_stats_vars().
     * This should be safe since glue->get_rtp_info() will have bumped the
     * refcount on the rtp instance so it can't go away while the channel
     * is unlocked.
     */
    if (rtp) {
        ast_rtp_instance_set_stats_vars(chan, rtp);
        ao2_ref(rtp, -1);
    }
 
    ast_softhangup(chan, AST_SOFTHANGUP_EXPLICIT);
 
    ast_ari_response_no_content(response);
}
 
void ast_ari_channels_list(struct ast_variable *headers,
    struct ast_ari_channels_list_args *args,
    struct ast_ari_response *response)
{
    RAII_VAR(struct ao2_container *, snapshots, NULL, ao2_cleanup);
    RAII_VAR(struct ast_json *, json, NULL, ast_json_unref);
    struct ao2_iterator i;
    void *obj;
    struct stasis_message_sanitizer *sanitize = stasis_app_get_sanitizer();
 
    snapshots = ast_channel_cache_all();
 
    json = ast_json_array_create();
    if (!json) {
        ast_ari_response_alloc_failed(response);
        return;
    }
 
    i = ao2_iterator_init(snapshots, 0);
    while ((obj = ao2_iterator_next(&i))) {
        struct ast_channel_snapshot *snapshot = obj;
        int r;
 
        if (sanitize && sanitize->channel_snapshot
            && sanitize->channel_snapshot(snapshot)) {
            ao2_ref(snapshot, -1);
            continue;
        }
 
        r = ast_json_array_append(
            json, ast_channel_snapshot_to_json(snapshot, NULL));
        if (r != 0) {
            ast_ari_response_alloc_failed(response);
            ao2_iterator_destroy(&i);
            ao2_ref(snapshot, -1);
            return;
        }
        ao2_ref(snapshot, -1);
    }
    ao2_iterator_destroy(&i);
 
    ast_ari_response_ok(response, ast_json_ref(json));
}
 
/*! \brief Structure used for origination */
struct ari_origination {
    /*! \brief Dialplan context */
    char context[AST_MAX_CONTEXT];
    /*! \brief Dialplan extension */
    char exten[AST_MAX_EXTENSION];
    /*! \brief Dialplan priority */
    int priority;
    /*! \brief Application data to pass to Stasis application */
    char appdata[0];
};
 
/*! \brief Thread which dials and executes upon answer */
static void *ari_originate_dial(void *data)
{
    struct ast_dial *dial = data;
    struct ari_origination *origination = ast_dial_get_user_data(dial);
    enum ast_dial_result res;
 
    res = ast_dial_run(dial, NULL, 0);
    if (res != AST_DIAL_RESULT_ANSWERED) {
        goto end;
    }
 
    if (!ast_strlen_zero(origination->appdata)) {
        struct ast_app *app = pbx_findapp("Stasis");
 
        if (app) {
            ast_verb(4, "Launching Stasis(%s) on %s\n", origination->appdata,
                ast_channel_name(ast_dial_answered(dial)));
            pbx_exec(ast_dial_answered(dial), app, origination->appdata);
        } else {
            ast_log(LOG_WARNING, "No such application 'Stasis'\n");
        }
    } else {
        struct ast_channel *answered = ast_dial_answered(dial);
 
        if (!ast_strlen_zero(origination->context)) {
            ast_channel_context_set(answered, origination->context);
        }
 
        if (!ast_strlen_zero(origination->exten)) {
            ast_channel_exten_set(answered, origination->exten);
        }
 
        if (origination->priority > 0) {
            ast_channel_priority_set(answered, origination->priority);
        }
 
        if (ast_pbx_run(answered)) {
            ast_log(LOG_ERROR, "Failed to start PBX on %s\n", ast_channel_name(answered));
        } else {
            /* PBX will have taken care of hanging up, so we steal the answered channel so dial doesn't do it */
            ast_dial_answered_steal(dial);
        }
    }
 
end:
    ast_dial_destroy(dial);
    ast_free(origination);
    return NULL;
}
 
static struct ast_channel *ari_channels_handle_originate_with_id(const char *args_endpoint,
    const char *args_extension,
    const char *args_context,
    long args_priority,
    const char *args_label,
    const char *args_app,
    const char *args_app_args,
    const char *args_caller_id,
    int args_timeout,
    struct ast_variable *variables,
    const char *args_channel_id,
    const char *args_other_channel_id,
    const char *args_originator,
    const char *args_formats,
    struct ast_ari_response *response)
{
    char *dialtech;
    char *dialdevice = NULL;
    struct ast_dial *dial;
    char *caller_id = NULL;
    char *cid_num = NULL;
    char *cid_name = NULL;
    char *stuff;
    struct ast_channel *other = NULL;
    struct ast_channel *chan = NULL;
    RAII_VAR(struct ast_channel_snapshot *, snapshot, NULL, ao2_cleanup);
    struct ast_assigned_ids assignedids = {
        .uniqueid = args_channel_id,
        .uniqueid2 = args_other_channel_id,
    };
    struct ari_origination *origination;
    pthread_t thread;
    struct ast_format_cap *format_cap = NULL;
 
    if ((assignedids.uniqueid && AST_MAX_PUBLIC_UNIQUEID < strlen(assignedids.uniqueid))
        || (assignedids.uniqueid2 && AST_MAX_PUBLIC_UNIQUEID < strlen(assignedids.uniqueid2))) {
        ast_ari_response_error(response, 400, "Bad Request",
            "Uniqueid length exceeds maximum of %d", AST_MAX_PUBLIC_UNIQUEID);
        return NULL;
    }
 
    if (ast_strlen_zero(args_endpoint)) {
        ast_ari_response_error(response, 400, "Bad Request",
            "Endpoint must be specified");
        return NULL;
    }
 
    if (!ast_strlen_zero(args_originator) && !ast_strlen_zero(args_formats)) {
        ast_ari_response_error(response, 400, "Bad Request",
            "Originator and formats can't both be specified");
        return NULL;
    }
 
    dialtech = ast_strdupa(args_endpoint);
    if ((stuff = strchr(dialtech, '/'))) {
        *stuff++ = '\0';
        dialdevice = stuff;
    }
 
    if (ast_strlen_zero(dialtech) || ast_strlen_zero(dialdevice)) {
        ast_ari_response_error(response, 400, "Bad Request",
            "Invalid endpoint specified");
        return NULL;
    }
 
    if (!ast_strlen_zero(args_app)) {
        RAII_VAR(struct ast_str *, appdata, ast_str_create(64), ast_free);
 
        if (!appdata) {
            ast_ari_response_alloc_failed(response);
            return NULL;
        }
 
        ast_str_set(&appdata, 0, "%s", args_app);
        if (!ast_strlen_zero(args_app_args)) {
            ast_str_append(&appdata, 0, ",%s", args_app_args);
        }
 
        origination = ast_calloc(1, sizeof(*origination) + ast_str_size(appdata) + 1);
        if (!origination) {
            ast_ari_response_alloc_failed(response);
            return NULL;
        }
 
        strcpy(origination->appdata, ast_str_buffer(appdata));
    } else if (!ast_strlen_zero(args_extension)) {
        origination = ast_calloc(1, sizeof(*origination) + 1);
        if (!origination) {
            ast_ari_response_alloc_failed(response);
            return NULL;
        }
 
        ast_copy_string(origination->context, S_OR(args_context, "default"), sizeof(origination->context));
        ast_copy_string(origination->exten, args_extension, sizeof(origination->exten));
 
        if (!ast_strlen_zero(args_label)) {
            /* A label was provided in the request, use that */
            int ipri = 1;
            if (sscanf(args_label, "%30d", &ipri) != 1) {
                ipri = ast_findlabel_extension(chan, origination->context, origination->exten, args_label, args_caller_id);
 
                if (ipri == -1) {
                    ast_log(AST_LOG_ERROR, "Requested label: %s can not be found in context: %s\n", args_label, args_context);
                    ast_ari_response_error(response, 404, "Not Found", "Requested label can not be found");
                    return NULL;
                }
            } else {
                ast_debug(3, "Numeric value provided for label, jumping to that priority\n");
            }
 
            if (ipri == 0) {
                ast_log(AST_LOG_ERROR, "Invalid priority label '%s' specified for extension %s in context: %s\n",
                        args_label, args_extension, args_context);
                ast_ari_response_error(response, 400, "Bad Request", "Requested priority is illegal");
                return NULL;
            }
 
            /* Our priority was provided by a label */
            origination->priority =  ipri;
        } else {
            /* No label provided, use provided priority */
            origination->priority = args_priority ? args_priority : 1;
        }
 
        origination->appdata[0] = '\0';
    } else {
        ast_ari_response_error(response, 400, "Bad Request",
            "Application or extension must be specified");
        return NULL;
    }
 
    dial = ast_dial_create();
    if (!dial) {
        ast_ari_response_alloc_failed(response);
        ast_free(origination);
        return NULL;
    }
    ast_dial_set_user_data(dial, origination);
 
    if (ast_dial_append(dial, dialtech, dialdevice, &assignedids)) {
        ast_ari_response_alloc_failed(response);
        ast_dial_destroy(dial);
        ast_free(origination);
        return NULL;
    }
 
    if (args_timeout > 0) {
        ast_dial_set_global_timeout(dial, args_timeout * 1000);
    } else if (args_timeout == -1) {
        ast_dial_set_global_timeout(dial, -1);
    } else {
        ast_dial_set_global_timeout(dial, 30000);
    }
 
    if (!ast_strlen_zero(args_caller_id)) {
        caller_id = ast_strdupa(args_caller_id);
        ast_callerid_parse(caller_id, &cid_name, &cid_num);
 
        if (ast_is_shrinkable_phonenumber(cid_num)) {
            ast_shrink_phone_number(cid_num);
        }
    }
 
    if (!ast_strlen_zero(args_originator)) {
        other = ast_channel_get_by_name(args_originator);
        if (!other) {
            ast_ari_response_error(
                response, 400, "Bad Request",
                "Provided originator channel was not found");
            ast_dial_destroy(dial);
            ast_free(origination);
            return NULL;
        }
    }
 
    if (!ast_strlen_zero(args_formats)) {
        char *format_name;
        char *formats_copy = ast_strdupa(args_formats);
 
        if (!(format_cap = ast_format_cap_alloc(AST_FORMAT_CAP_FLAG_DEFAULT))) {
            ast_ari_response_alloc_failed(response);
            ast_dial_destroy(dial);
            ast_free(origination);
            ast_channel_cleanup(other);
            return NULL;
        }
 
        while ((format_name = ast_strip(strsep(&formats_copy, ",")))) {
            struct ast_format *fmt = ast_format_cache_get(format_name);
 
            if (!fmt || ast_format_cap_append(format_cap, fmt, 0)) {
                if (!fmt) {
                    ast_ari_response_error(
                        response, 400, "Bad Request",
                        "Provided format (%s) was not found", format_name);
                } else {
                    ast_ari_response_alloc_failed(response);
                }
                ast_dial_destroy(dial);
                ast_free(origination);
                ast_channel_cleanup(other);
                ao2_ref(format_cap, -1);
                ao2_cleanup(fmt);
                return NULL;
            }
            ao2_ref(fmt, -1);
        }
    }
 
    if (ast_dial_prerun(dial, other, format_cap)) {
        if (ast_channel_errno() == AST_CHANNEL_ERROR_ID_EXISTS) {
            ast_ari_response_error(response, 409, "Conflict",
                "Channel with given unique ID already exists");
        } else {
            ast_ari_response_alloc_failed(response);
        }
        ast_dial_destroy(dial);
        ast_free(origination);
        ast_channel_cleanup(other);
        return NULL;
    }
 
    ast_channel_cleanup(other);
    ao2_cleanup(format_cap);
 
    chan = ast_dial_get_channel(dial, 0);
    if (!chan) {
        ast_ari_response_alloc_failed(response);
        ast_dial_destroy(dial);
        ast_free(origination);
        return NULL;
    }
 
    if (!ast_strlen_zero(cid_num) || !ast_strlen_zero(cid_name)) {
        struct ast_party_connected_line connected;
 
        /*
         * It seems strange to set the CallerID on an outgoing call leg
         * to whom we are calling, but this function's callers are doing
         * various Originate methods.  This call leg goes to the local
         * user.  Once the called party answers, the dialplan needs to
         * be able to access the CallerID from the CALLERID function as
         * if the called party had placed this call.
         */
        ast_set_callerid(chan, cid_num, cid_name, cid_num);
 
        ast_party_connected_line_set_init(&connected, ast_channel_connected(chan));
        if (!ast_strlen_zero(cid_num)) {
            connected.id.number.valid = 1;
            connected.id.number.str = (char *) cid_num;
            connected.id.number.presentation = AST_PRES_ALLOWED_USER_NUMBER_NOT_SCREENED;
        }
        if (!ast_strlen_zero(cid_name)) {
            connected.id.name.valid = 1;
            connected.id.name.str = (char *) cid_name;
            connected.id.name.presentation = AST_PRES_ALLOWED_USER_NUMBER_NOT_SCREENED;
        }
        ast_channel_set_connected_line(chan, &connected, NULL);
    }
 
    if (variables) {
        ast_set_variables(chan, variables);
    }
    ast_set_flag(ast_channel_flags(chan), AST_FLAG_ORIGINATED);
 
    if (!ast_strlen_zero(args_app)) {
        struct ast_channel *local_peer;
 
        stasis_app_subscribe_channel(args_app, chan);
 
        /* Subscribe to the Local channel peer also. */
        local_peer = ast_local_get_peer(chan);
        if (local_peer) {
            stasis_app_subscribe_channel(args_app, local_peer);
            ast_channel_unref(local_peer);
        }
    }
 
    snapshot = ast_channel_snapshot_get_latest(ast_channel_uniqueid(chan));
 
    /* Before starting the async dial bump the ref in case the dial quickly goes away and takes
     * the reference with it
     */
    ast_channel_ref(chan);
 
    if (ast_pthread_create_detached(&thread, NULL, ari_originate_dial, dial)) {
        ast_ari_response_alloc_failed(response);
        ast_dial_destroy(dial);
        ast_free(origination);
    } else {
        ast_ari_response_ok(response, ast_channel_snapshot_to_json(snapshot, NULL));
    }
 
    return chan;
}
 
/*!
 * \internal
 * \brief Convert a \c ast_json list of key/value pair tuples into a \c ast_variable list
 * \since 13.3.0
 *
 * \param[out] response HTTP response if error
 * \param json_variables The JSON blob containing the variable
 * \param[out] variables An out reference to the variables to populate.
 *
 * \retval 0 on success.
 * \retval -1 on error.
 */
static int json_to_ast_variables(struct ast_ari_response *response, struct ast_json *json_variables, struct ast_variable **variables)
{
    enum ast_json_to_ast_vars_code res;
 
    res = ast_json_to_ast_variables(json_variables, variables);
    switch (res) {
    case AST_JSON_TO_AST_VARS_CODE_SUCCESS:
        return 0;
    case AST_JSON_TO_AST_VARS_CODE_INVALID_TYPE:
        ast_ari_response_error(response, 400, "Bad Request",
            "Only string values in the 'variables' object allowed");
        break;
    case AST_JSON_TO_AST_VARS_CODE_OOM:
        ast_ari_response_alloc_failed(response);
        break;
    }
    ast_log(AST_LOG_ERROR, "Unable to convert 'variables' in JSON body to channel variables\n");
 
    return -1;
}
 
void ast_ari_channels_originate_with_id(struct ast_variable *headers,
    struct ast_ari_channels_originate_with_id_args *args,
    struct ast_ari_response *response)
{
    struct ast_variable *variables = NULL;
    struct ast_channel *chan;
 
    /* Parse any query parameters out of the body parameter */
    if (args->variables) {
        struct ast_json *json_variables;
 
        ast_ari_channels_originate_with_id_parse_body(args->variables, args);
        json_variables = ast_json_object_get(args->variables, "variables");
        if (json_variables
            && json_to_ast_variables(response, json_variables, &variables)) {
            return;
        }
    }
 
    chan = ari_channels_handle_originate_with_id(
        args->endpoint,
        args->extension,
        args->context,
        args->priority,
        args->label,
        args->app,
        args->app_args,
        args->caller_id,
        args->timeout,
        variables,
        args->channel_id,
        args->other_channel_id,
        args->originator,
        args->formats,
        response);
    ast_channel_cleanup(chan);
    ast_variables_destroy(variables);
}
 
void ast_ari_channels_originate(struct ast_variable *headers,
    struct ast_ari_channels_originate_args *args,
    struct ast_ari_response *response)
{
    struct ast_variable *variables = NULL;
    struct ast_channel *chan;
 
    /* Parse any query parameters out of the body parameter */
    if (args->variables) {
        struct ast_json *json_variables;
 
        ast_ari_channels_originate_parse_body(args->variables, args);
        json_variables = ast_json_object_get(args->variables, "variables");
        if (json_variables
            && json_to_ast_variables(response, json_variables, &variables)) {
            return;
        }
    }
 
    chan = ari_channels_handle_originate_with_id(
        args->endpoint,
        args->extension,
        args->context,
        args->priority,
        args->label,
        args->app,
        args->app_args,
        args->caller_id,
        args->timeout,
        variables,
        args->channel_id,
        args->other_channel_id,
        args->originator,
        args->formats,
        response);
    ast_channel_cleanup(chan);
    ast_variables_destroy(variables);
}
 
void ast_ari_channels_get_channel_var(struct ast_variable *headers,
    struct ast_ari_channels_get_channel_var_args *args,
    struct ast_ari_response *response)
{
    RAII_VAR(struct ast_json *, json, NULL, ast_json_unref);
    RAII_VAR(struct stasis_app_control *, control, NULL, ao2_cleanup);
    RAII_VAR(struct ast_str *, value, ast_str_create(32), ast_free);
    RAII_VAR(struct ast_channel *, channel, NULL, ast_channel_cleanup);
 
    ast_assert(response != NULL);
 
    if (!value) {
        ast_ari_response_alloc_failed(response);
        return;
    }
 
    if (ast_strlen_zero(args->variable)) {
        ast_ari_response_error(
            response, 400, "Bad Request",
            "Variable name is required");
        return;
    }
 
    if (ast_strlen_zero(args->channel_id)) {
        ast_ari_response_error(
            response, 400, "Bad Request",
            "Channel ID is required");
        return;
    }
 
    channel = ast_channel_get_by_name(args->channel_id);
    if (!channel) {
        ast_ari_response_error(
            response, 404, "Channel Not Found",
            "Provided channel was not found");
        return;
    }
 
    /* You may be tempted to lock the channel you're about to read from. You
     * would be wrong. Some dialplan functions put the channel into
     * autoservice, which deadlocks if the channel is already locked.
     * ast_str_retrieve_variable() does its own locking, and the dialplan
     * functions need to as well. We should be fine without the lock.
     */
 
    if (args->variable[strlen(args->variable) - 1] == ')') {
        if (ast_func_read2(channel, args->variable, &value, 0)) {
            ast_ari_response_error(
                response, 500, "Error With Function",
                "Unable to read provided function");
            return;
        }
    } else {
        if (!ast_str_retrieve_variable(&value, 0, channel, NULL, args->variable)) {
            ast_ari_response_error(
                response, 404, "Variable Not Found",
                "Provided variable was not found");
            return;
        }
    }
 
    if (!(json = ast_json_pack("{s: s}", "value", S_OR(ast_str_buffer(value), "")))) {
        ast_ari_response_alloc_failed(response);
        return;
    }
 
    ast_ari_response_ok(response, ast_json_ref(json));
}
 
void ast_ari_channels_set_channel_var(struct ast_variable *headers,
    struct ast_ari_channels_set_channel_var_args *args,
    struct ast_ari_response *response)
{
    RAII_VAR(struct stasis_app_control *, control, NULL, ao2_cleanup);
 
    ast_assert(response != NULL);
 
    if (ast_strlen_zero(args->variable)) {
        ast_ari_response_error(
            response, 400, "Bad Request",
            "Variable name is required");
        return;
    }
 
    control = find_control(response, args->channel_id);
    if (control == NULL) {
        /* response filled in by find_control */
        return;
    }
 
    if (stasis_app_control_set_channel_var(control, args->variable, args->value)) {
        ast_ari_response_error(
            response, 400, "Bad Request",
            "Failed to execute function");
        return;
    }
 
    ast_ari_response_no_content(response);
}
 
static void ari_channels_handle_snoop_channel(
    const char *args_channel_id,
    const char *args_spy,
    const char *args_whisper,
    const char *args_app,
    const char *args_app_args,
    const char *args_snoop_id,
    struct ast_ari_response *response)
{
    enum stasis_app_snoop_direction spy, whisper;
    RAII_VAR(struct ast_channel *, chan, NULL, ast_channel_cleanup);
    RAII_VAR(struct ast_channel *, snoop, NULL, ast_channel_cleanup);
    RAII_VAR(struct ast_channel_snapshot *, snapshot, NULL, ao2_cleanup);
 
    ast_assert(response != NULL);
 
    if (ast_strlen_zero(args_spy) || !strcmp(args_spy, "none")) {
        spy = STASIS_SNOOP_DIRECTION_NONE;
    } else if (!strcmp(args_spy, "both")) {
        spy = STASIS_SNOOP_DIRECTION_BOTH;
    } else if (!strcmp(args_spy, "out")) {
        spy = STASIS_SNOOP_DIRECTION_OUT;
    } else if (!strcmp(args_spy, "in")) {
        spy = STASIS_SNOOP_DIRECTION_IN;
    } else {
        ast_ari_response_error(
            response, 400, "Bad Request",
            "Invalid direction specified for spy");
        return;
    }
 
    if (ast_strlen_zero(args_whisper) || !strcmp(args_whisper, "none")) {
        whisper = STASIS_SNOOP_DIRECTION_NONE;
    } else if (!strcmp(args_whisper, "both")) {
        whisper = STASIS_SNOOP_DIRECTION_BOTH;
    } else if (!strcmp(args_whisper, "out")) {
        whisper = STASIS_SNOOP_DIRECTION_OUT;
    } else if (!strcmp(args_whisper, "in")) {
        whisper = STASIS_SNOOP_DIRECTION_IN;
    } else {
        ast_ari_response_error(
            response, 400, "Bad Request",
            "Invalid direction specified for whisper");
        return;
    }
 
    if (spy == STASIS_SNOOP_DIRECTION_NONE && whisper == STASIS_SNOOP_DIRECTION_NONE) {
        ast_ari_response_error(
            response, 400, "Bad Request",
            "Direction must be specified for at least spy or whisper");
        return;
    } else if (ast_strlen_zero(args_app)) {
        ast_ari_response_error(
            response, 400, "Bad Request",
            "Application name is required");
        return;
    }
 
    chan = ast_channel_get_by_name(args_channel_id);
    if (chan == NULL) {
        ast_ari_response_error(
            response, 404, "Channel Not Found",
            "Provided channel was not found");
        return;
    }
 
    snoop = stasis_app_control_snoop(chan, spy, whisper, args_app, args_app_args,
        args_snoop_id);
    if (snoop == NULL) {
        ast_ari_response_error(
            response, 500, "Internal error",
            "Snoop channel could not be created");
        return;
    }
 
    snapshot = ast_channel_snapshot_get_latest(ast_channel_uniqueid(snoop));
    ast_ari_response_ok(response, ast_channel_snapshot_to_json(snapshot, NULL));
}
 
void ast_ari_channels_snoop_channel(struct ast_variable *headers,
    struct ast_ari_channels_snoop_channel_args *args,
    struct ast_ari_response *response)
{
    ari_channels_handle_snoop_channel(
        args->channel_id,
        args->spy,
        args->whisper,
        args->app,
        args->app_args,
        args->snoop_id,
        response);
}
 
void ast_ari_channels_snoop_channel_with_id(struct ast_variable *headers,
    struct ast_ari_channels_snoop_channel_with_id_args *args,
    struct ast_ari_response *response)
{
    ari_channels_handle_snoop_channel(
        args->channel_id,
        args->spy,
        args->whisper,
        args->app,
        args->app_args,
        args->snoop_id,
        response);
}
 
struct ari_channel_thread_data {
    struct ast_channel *chan;
    struct ast_str *stasis_stuff;
};
 
static void chan_data_destroy(struct ari_channel_thread_data *chan_data)
{
    ast_free(chan_data->stasis_stuff);
    ast_hangup(chan_data->chan);
    ast_free(chan_data);
}
 
/*!
 * \brief Thread that owns stasis-created channel.
 *
 * The channel enters into a Stasis application immediately upon creation. In this
 * way, the channel can be manipulated by the Stasis application. Once the channel
 * exits the Stasis application, it is hung up.
 */
static void *ari_channel_thread(void *data)
{
    struct ari_channel_thread_data *chan_data = data;
    struct ast_app *stasis_app;
 
    stasis_app = pbx_findapp("Stasis");
    if (!stasis_app) {
        ast_log(LOG_ERROR, "Stasis dialplan application is not registered");
        chan_data_destroy(chan_data);
        return NULL;
    }
 
    pbx_exec(chan_data->chan, stasis_app, ast_str_buffer(chan_data->stasis_stuff));
 
    chan_data_destroy(chan_data);
 
    return NULL;
}
 
struct ast_datastore_info dialstring_info = {
    .type = "ARI Dialstring",
    .destroy = ast_free_ptr,
};
 
/*!
 * \brief Save dialstring onto a channel datastore
 *
 * This will later be retrieved when it comes time to actually dial the channel
 *
 * \param chan The channel on which to save the dialstring
 * \param dialstring The dialstring to save
 * \retval 0 on success.
 * \retval -1 on error.
 */
static int save_dialstring(struct ast_channel *chan, const char *dialstring)
{
    struct ast_datastore *datastore;
 
    datastore = ast_datastore_alloc(&dialstring_info, NULL);
    if (!datastore) {
        return -1;
    }
 
    datastore->data = ast_strdup(dialstring);
    if (!datastore->data) {
        ast_datastore_free(datastore);
        return -1;
    }
 
    ast_channel_lock(chan);
    if (ast_channel_datastore_add(chan, datastore)) {
        ast_channel_unlock(chan);
        ast_datastore_free(datastore);
        return -1;
    }
    ast_channel_unlock(chan);
 
    return 0;
}
 
/*!
 * \brief Retrieve the dialstring from the channel datastore
 *
 * \pre chan is locked
 * \param chan Channel that was previously created in ARI
 * \retval NULL Failed to find datastore
 * \retval non-NULL The dialstring
 */
static char *restore_dialstring(struct ast_channel *chan)
{
    struct ast_datastore *datastore;
 
    datastore = ast_channel_datastore_find(chan, &dialstring_info, NULL);
    if (!datastore) {
        return NULL;
    }
 
    return datastore->data;
}
 
void ast_ari_channels_create(struct ast_variable *headers,
    struct ast_ari_channels_create_args *args,
    struct ast_ari_response *response)
{
    RAII_VAR(struct ast_variable *, variables, NULL, ast_variables_destroy);
    struct ast_assigned_ids assignedids;
    struct ari_channel_thread_data *chan_data;
    struct ast_channel_snapshot *snapshot;
    pthread_t thread;
    char *dialtech;
    char *dialdevice = NULL;
    char *stuff;
    int cause;
    struct ast_format_cap *request_cap;
    struct ast_channel *originator = NULL;
 
    /* Parse any query parameters out of the body parameter */
    if (args->variables) {
        struct ast_json *json_variables;
 
        ast_ari_channels_create_parse_body(args->variables, args);
        json_variables = ast_json_object_get(args->variables, "variables");
        if (json_variables
            && json_to_ast_variables(response, json_variables, &variables)) {
            return;
        }
    }
 
    assignedids.uniqueid = args->channel_id;
    assignedids.uniqueid2 = args->other_channel_id;
 
    if (!ast_strlen_zero(args->originator) && !ast_strlen_zero(args->formats)) {
        ast_ari_response_error(response, 400, "Bad Request",
            "Originator and formats can't both be specified");
        return;
    }
 
    if (ast_strlen_zero(args->endpoint)) {
        ast_ari_response_error(response, 400, "Bad Request",
            "Endpoint must be specified");
        return;
    }
 
    chan_data = ast_calloc(1, sizeof(*chan_data));
    if (!chan_data) {
        ast_ari_response_alloc_failed(response);
        return;
    }
 
    chan_data->stasis_stuff = ast_str_create(32);
    if (!chan_data->stasis_stuff) {
        ast_ari_response_alloc_failed(response);
        chan_data_destroy(chan_data);
        return;
    }
 
    ast_str_append(&chan_data->stasis_stuff, 0, "%s", args->app);
    if (!ast_strlen_zero(args->app_args)) {
        ast_str_append(&chan_data->stasis_stuff, 0, ",%s", args->app_args);
    }
 
    dialtech = ast_strdupa(args->endpoint);
    if ((stuff = strchr(dialtech, '/'))) {
        *stuff++ = '\0';
        dialdevice = stuff;
    }
 
    if (ast_strlen_zero(dialtech) || ast_strlen_zero(dialdevice)) {
        ast_ari_response_error(response, 400, "Bad Request",
            "Invalid endpoint specified");
        chan_data_destroy(chan_data);
        return;
    }
 
    if (!ast_strlen_zero(args->originator)) {
        originator = ast_channel_get_by_name(args->originator);
    }
 
    if (originator) {
        request_cap = ao2_bump(ast_channel_nativeformats(originator));
        if (!ast_strlen_zero(args->app)) {
            stasis_app_subscribe_channel(args->app, originator);
        }
    } else if (!ast_strlen_zero(args->formats)) {
        char *format_name;
        char *formats_copy = ast_strdupa(args->formats);
 
        if (!(request_cap = ast_format_cap_alloc(AST_FORMAT_CAP_FLAG_DEFAULT))) {
            ast_ari_response_alloc_failed(response);
            chan_data_destroy(chan_data);
            return;
        }
 
        while ((format_name = ast_strip(strsep(&formats_copy, ",")))) {
            struct ast_format *fmt = ast_format_cache_get(format_name);
 
            if (!fmt || ast_format_cap_append(request_cap, fmt, 0)) {
                if (!fmt) {
                    ast_ari_response_error(
                        response, 400, "Bad Request",
                        "Provided format (%s) was not found", format_name);
                } else {
                    ast_ari_response_alloc_failed(response);
                }
                ao2_ref(request_cap, -1);
                ao2_cleanup(fmt);
                chan_data_destroy(chan_data);
                return;
            }
            ao2_ref(fmt, -1);
        }
    } else {
        if (!(request_cap = ast_format_cap_alloc(AST_FORMAT_CAP_FLAG_DEFAULT))) {
            ast_ari_response_alloc_failed(response);
            chan_data_destroy(chan_data);
            return;
        }
 
        ast_format_cap_append_by_type(request_cap, AST_MEDIA_TYPE_AUDIO);
    }
 
    chan_data->chan = ast_request(dialtech, request_cap, &assignedids, originator, dialdevice, &cause);
    ao2_cleanup(request_cap);
 
    if (!chan_data->chan) {
        if (ast_channel_errno() == AST_CHANNEL_ERROR_ID_EXISTS) {
            ast_ari_response_error(response, 409, "Conflict",
                "Channel with given unique ID already exists");
        } else {
            ast_ari_response_alloc_failed(response);
        }
        ast_channel_cleanup(originator);
        chan_data_destroy(chan_data);
        return;
    }
 
    if (!ast_strlen_zero(args->app)) {
        stasis_app_subscribe_channel(args->app, chan_data->chan);
    }
 
    if (variables) {
        ast_set_variables(chan_data->chan, variables);
    }
 
    ast_channel_cleanup(originator);
 
    if (save_dialstring(chan_data->chan, stuff)) {
        ast_ari_response_alloc_failed(response);
        chan_data_destroy(chan_data);
        return;
    }
 
    snapshot = ast_channel_snapshot_get_latest(ast_channel_uniqueid(chan_data->chan));
 
    if (ast_pthread_create_detached(&thread, NULL, ari_channel_thread, chan_data)) {
        ast_ari_response_alloc_failed(response);
        chan_data_destroy(chan_data);
    } else {
        ast_ari_response_ok(response, ast_channel_snapshot_to_json(snapshot, NULL));
    }
 
    ao2_ref(snapshot, -1);
}
 
void ast_ari_channels_dial(struct ast_variable *headers,
    struct ast_ari_channels_dial_args *args,
    struct ast_ari_response *response)
{
    RAII_VAR(struct stasis_app_control *, control, NULL, ao2_cleanup);
    RAII_VAR(struct ast_channel *, caller, NULL, ast_channel_cleanup);
    RAII_VAR(struct ast_channel *, callee, NULL, ast_channel_cleanup);
    char *dialstring;
 
    control = find_control(response, args->channel_id);
    if (control == NULL) {
        /* Response filled in by find_control */
        return;
    }
 
    if (!ast_strlen_zero(args->caller)) {
        caller = ast_channel_get_by_name(args->caller);
    }
 
    callee = ast_channel_get_by_name(args->channel_id);
    if (!callee) {
        ast_ari_response_error(response, 404, "Not Found",
            "Callee not found");
        return;
    }
 
    if (ast_channel_state(callee) != AST_STATE_DOWN
        && ast_channel_state(callee) != AST_STATE_RESERVED) {
        ast_ari_response_error(response, 409, "Conflict",
            "Channel is not in the 'Down' state");
        return;
    }
 
    /* XXX This is straight up copied from main/dial.c. It's probably good
     * to separate this to some common method.
     */
    if (caller) {
        ast_channel_lock_both(caller, callee);
    } else {
        ast_channel_lock(callee);
    }
 
    dialstring = restore_dialstring(callee);
    if (!dialstring) {
        ast_channel_unlock(callee);
        if (caller) {
            ast_channel_unlock(caller);
        }
        ast_ari_response_error(response, 409, "Conflict",
            "Dialing a channel not created by ARI");
        return;
    }
    /* Make a copy of the dialstring just in case some jerk tries to hang up the
     * channel before we can actually dial
     */
    dialstring = ast_strdupa(dialstring);
 
    ast_channel_stage_snapshot(callee);
    if (caller) {
        ast_channel_inherit_variables(caller, callee);
        ast_channel_datastore_inherit(caller, callee);
        ast_max_forwards_decrement(callee);
 
        /* Copy over callerid information */
        ast_party_redirecting_copy(ast_channel_redirecting(callee), ast_channel_redirecting(caller));
 
        ast_channel_dialed(callee)->transit_network_select = ast_channel_dialed(caller)->transit_network_select;
 
        ast_connected_line_copy_from_caller(ast_channel_connected(callee), ast_channel_caller(caller));
 
        ast_channel_language_set(callee, ast_channel_language(caller));
        ast_channel_req_accountcodes(callee, caller, AST_CHANNEL_REQUESTOR_BRIDGE_PEER);
        if (ast_strlen_zero(ast_channel_musicclass(callee)))
            ast_channel_musicclass_set(callee, ast_channel_musicclass(caller));
 
        ast_channel_adsicpe_set(callee, ast_channel_adsicpe(caller));
        ast_channel_transfercapability_set(callee, ast_channel_transfercapability(caller));
        ast_channel_unlock(caller);
    }
 
    ast_channel_stage_snapshot_done(callee);
    ast_channel_unlock(callee);
 
    if (stasis_app_control_dial(control, dialstring, args->timeout)) {
        ast_ari_response_alloc_failed(response);
        return;
    }
 
    ast_ari_response_no_content(response);
}
 
void ast_ari_channels_rtpstatistics(struct ast_variable *headers,
        struct ast_ari_channels_rtpstatistics_args *args,
        struct ast_ari_response *response)
{
    RAII_VAR(struct ast_channel *, chan, NULL, ast_channel_cleanup);
    RAII_VAR(struct ast_rtp_instance *, rtp, NULL, ao2_cleanup);
    struct ast_json *j_res;
    const struct ast_channel_tech *tech;
    struct ast_rtp_glue *glue;
 
    chan = ast_channel_get_by_name(args->channel_id);
    if (!chan) {
        ast_ari_response_error(response, 404, "Not Found",
            "Channel not found");
        return;
    }
 
    ast_channel_lock(chan);
    tech = ast_channel_tech(chan);
    if (!tech) {
        ast_channel_unlock(chan);
        ast_ari_response_error(response, 404, "Not Found",
            "Channel's tech not found");
        return;
    }
 
    glue = ast_rtp_instance_get_glue(tech->type);
    if (!glue) {
        ast_channel_unlock(chan);
        ast_ari_response_error(response, 403, "Forbidden",
            "Unsupported channel type");
        return;
    }
 
    glue->get_rtp_info(chan, &rtp);
    if (!rtp) {
        ast_channel_unlock(chan);
        ast_ari_response_error(response, 404, "Not Found",
            "RTP info not found");
        return;
    }
 
    j_res = ast_rtp_instance_get_stats_all_json(rtp);
    if (!j_res) {
        ast_channel_unlock(chan);
        ast_ari_response_error(response, 404, "Not Found",
            "Statistics not found");
        return;
    }
 
    ast_channel_unlock(chan);
    ast_ari_response_ok(response, j_res);
 
    return;
}
 
static int external_media_rtp_udp(struct ast_ari_channels_external_media_args *args,
    struct ast_variable *variables,
    struct ast_ari_response *response)
{
    char *endpoint;
    struct ast_channel *chan;
    struct varshead *vars;
 
    if (ast_asprintf(&endpoint, "UnicastRTP/%s/c(%s)",
            args->external_host,
            args->format) == -1) {
        return 1;
    }
 
    chan = ari_channels_handle_originate_with_id(
        endpoint,
        NULL,
        NULL,
        0,
        NULL,
        args->app,
        args->data,
        NULL,
        0,
        variables,
        args->channel_id,
        NULL,
        NULL,
        args->format,
        response);
 
    ast_free(endpoint);
 
    if (!chan) {
        return 1;
    }
 
    ast_channel_lock(chan);
    vars = ast_channel_varshead(chan);
    if (vars && !AST_LIST_EMPTY(vars)) {
        ast_json_object_set(response->message, "channelvars", ast_json_channel_vars(vars));
    }
    ast_channel_unlock(chan);
    ast_channel_unref(chan);
    return 0;
}
 
static int external_media_audiosocket_tcp(struct ast_ari_channels_external_media_args *args,
    struct ast_variable *variables,
    struct ast_ari_response *response)
{
    char *endpoint;
    struct ast_channel *chan;
    struct varshead *vars;
 
    if (ast_asprintf(&endpoint, "AudioSocket/%s/%s",
        args->external_host, args->data) == -1) {
        return 1;
    }
 
    chan = ari_channels_handle_originate_with_id(
        endpoint,
        NULL,
        NULL,
        0,
        NULL,
        args->app,
        args->data,
        NULL,
        0,
        variables,
        args->channel_id,
        NULL,
        NULL,
        args->format,
        response);
 
    ast_free(endpoint);
 
    if (!chan) {
        return 1;
    }
 
    ast_channel_lock(chan);
    vars = ast_channel_varshead(chan);
    if (vars && !AST_LIST_EMPTY(vars)) {
        ast_json_object_set(response->message, "channelvars", ast_json_channel_vars(vars));
    }
    ast_channel_unlock(chan);
    ast_channel_unref(chan);
    return 0;
}
 
static int external_media_websocket(struct ast_ari_channels_external_media_args *args,
    struct ast_variable *variables,
    struct ast_ari_response *response)
{
    char *endpoint;
    struct ast_channel *chan;
    struct varshead *vars;
    char direction[16] = "";
 
    /* If direction is set here, it WILL override any m() line in transport data
     * since it is appended to the end of the string.
     */
    if (args->direction) {
        snprintf(direction, sizeof(direction), "d(%s)", args->direction);
    }
 
    if (ast_asprintf(&endpoint, "WebSocket/%s%s%s%s%s",
            args->external_host,
            S_COR(args->transport_data, "/", ""),
            S_OR(args->transport_data, ""),
            S_COR(!args->transport_data && args->direction, "/", ""),
            direction) == -1) {
        return 1;
    }
 
    chan = ari_channels_handle_originate_with_id(
        endpoint,
        NULL,
        NULL,
        0,
        NULL,
        args->app,
        args->data,
        NULL,
        0,
        variables,
        args->channel_id,
        NULL,
        NULL,
        args->format,
        response);
 
    ast_free(endpoint);
 
    if (!chan) {
        return 1;
    }
 
    ast_channel_lock(chan);
    vars = ast_channel_varshead(chan);
    if (vars && !AST_LIST_EMPTY(vars)) {
        ast_json_object_set(response->message, "channelvars", ast_json_channel_vars(vars));
    }
    ast_channel_unlock(chan);
    ast_channel_unref(chan);
    return 0;
}
 
#include "asterisk/config.h"
#include "asterisk/netsock2.h"
 
void ast_ari_channels_external_media(struct ast_variable *headers,
    struct ast_ari_channels_external_media_args *args, struct ast_ari_response *response)
{
    RAII_VAR(struct ast_variable *, variables, NULL, ast_variables_destroy);
    char *external_host;
    char *host = NULL;
    char *port = NULL;
 
    ast_assert(response != NULL);
 
    /* Parse any query parameters out of the body parameter */
    if (args->variables) {
        struct ast_json *json_variables;
 
        ast_ari_channels_external_media_parse_body(args->variables, args);
        json_variables = ast_json_object_get(args->variables, "variables");
        if (json_variables
            && json_to_ast_variables(response, json_variables, &variables)) {
            return;
        }
    }
 
    if (ast_strlen_zero(args->app)) {
        ast_ari_response_error(response, 400, "Bad Request", "app cannot be empty");
        return;
    }
 
    if (ast_strlen_zero(args->transport)) {
        args->transport = "udp";
    }
 
    if (ast_strlen_zero(args->encapsulation)) {
        args->encapsulation = "rtp";
    }
    if (ast_strings_equal(args->transport, "websocket")) {
        if (!ast_strings_equal(args->encapsulation, "none")) {
            ast_ari_response_error(response, 400, "Bad Request", "encapsulation must be 'none' for websocket transport");
            return;
        }
    }
 
    if (ast_strings_equal(args->encapsulation, "rtp")) {
        if (!ast_strings_equal(args->transport, "udp")) {
            ast_ari_response_error(response, 400, "Bad Request", "transport must be 'udp' for rtp encapsulation");
            return;
        }
    }
 
    if (ast_strings_equal(args->encapsulation, "audiosocket")) {
        if (!ast_strings_equal(args->transport, "tcp")) {
            ast_ari_response_error(response, 400, "Bad Request", "transport must be 'tcp' for audiosocket encapsulation");
            return;
        }
    }
 
    if (ast_strlen_zero(args->connection_type)) {
        args->connection_type = "client";
    }
    if (!ast_strings_equal(args->transport, "websocket")) {
        if (ast_strings_equal(args->connection_type, "server")) {
            ast_ari_response_error(response, 400, "Bad Request", "'server' connection_type can only be used with the websocket transport");
            return;
        }
    }
 
    if (ast_strlen_zero(args->external_host)) {
        if (ast_strings_equal(args->connection_type, "client")) {
            ast_ari_response_error(response, 400, "Bad Request", "external_host is required for all but websocket server connections");
            return;
        } else {
            /* server is only valid for websocket, enforced above */
            args->external_host = "INCOMING";
        }
    }
 
    if (ast_strings_equal(args->transport, "websocket")) {
        if (ast_strings_equal(args->connection_type, "client")) {
            struct ast_websocket_client *ws_client =
                ast_websocket_client_retrieve_by_id(args->external_host);
            ao2_cleanup(ws_client);
            if (!ws_client) {
                ast_ari_response_error(response, 400, "Bad Request", "external_host must be a valid websocket_client connection id.");
                return;
            }
        }
    } else {
        external_host = ast_strdupa(args->external_host);
        if (!ast_sockaddr_split_hostport(external_host, &host, &port, PARSE_PORT_REQUIRE)) {
            ast_ari_response_error(response, 400, "Bad Request", "external_host must be <host>:<port> for all transports other than websocket");
            return;
        }
    }
 
    if (ast_strlen_zero(args->format)) {
        ast_ari_response_error(response, 400, "Bad Request", "format cannot be empty");
        return;
    }
 
    if (!ast_strlen_zero(args->direction)) {
        if (strcmp(args->direction, "both") && strcmp(args->direction, "in")
            && strcmp(args->direction, "out")) {
            ast_ari_response_error(
                response, 400, "Bad Request",
                "Invalid direction specified");
            return;
        }
    }
 
    if (strcasecmp(args->encapsulation, "rtp") == 0 && strcasecmp(args->transport, "udp") == 0) {
        if (external_media_rtp_udp(args, variables, response)) {
            ast_ari_response_error(
                response, 500, "Internal Server Error",
                "An internal error prevented this request from being handled");
        }
    } else if (strcasecmp(args->encapsulation, "audiosocket") == 0 && strcasecmp(args->transport, "tcp") == 0) {
        if (ast_strlen_zero(args->data)) {
            ast_ari_response_error(response, 400, "Bad Request", "data can not be empty");
        } else if (external_media_audiosocket_tcp(args, variables, response)) {
            ast_ari_response_error(
                response, 500, "Internal Server Error",
                "An internal error prevented this request from being handled");
        }
    } else if (strcasecmp(args->encapsulation, "none") == 0 && strcasecmp(args->transport, "websocket") == 0) {
        if (external_media_websocket(args, variables, response)) {
            ast_ari_response_error(
                response, 500, "Internal Server Error",
                "An internal error prevented this request from being handled");
        }
    } else {
        ast_ari_response_error(
            response, 501, "Not Implemented",
            "The encapsulation and/or transport is not supported");
    }
}
 
void ast_ari_channels_transfer_progress(struct ast_variable *headers, struct ast_ari_channels_transfer_progress_args *args, struct ast_ari_response *response)
{
    enum ast_control_transfer message;
    RAII_VAR(struct stasis_app_control *, control, NULL, ao2_cleanup);
    RAII_VAR(struct ast_channel *, chan, NULL, ast_channel_cleanup);
 
    control = find_control(response, args->channel_id);
    if (control == NULL) {
        /* Response filled in by find_control */
        return;
    }
 
    chan = ast_channel_get_by_name(args->channel_id);
    if (!chan) {
        ast_ari_response_error(response, 404, "Not Found",
            "Callee not found");
        return;
    }
 
    if (ast_strlen_zero(args->states)) {
        ast_ari_response_error(response, 400, "Bad Request", "states must not be empty");
        return;
    }
 
    if (strcasecmp(args->states, "channel_progress") == 0) {
        message = AST_TRANSFER_PROGRESS;
    } else if (strcasecmp(args->states, "channel_answered") == 0) {
        message = AST_TRANSFER_SUCCESS;
    } else if (strcasecmp(args->states, "channel_unavailable") == 0) {
        message = AST_TRANSFER_UNAVAILABLE;
    } else if (strcasecmp(args->states, "channel_declined") == 0) {
        message = AST_TRANSFER_FAILED;
    } else {
        ast_ari_response_error(response, 400, "Bad Request", "Invalid states value");
        return;
    }
 
    ast_indicate_data(chan, AST_CONTROL_TRANSFER, &message, sizeof(message));
    ast_ari_response_no_content(response);
}