app_blind_transfer.c

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/*
 * Asterisk -- An open source telephony toolkit.
 *
 * Copyright (C) 2019, Alexei Gradinari
 *
 * Alexei Gradinari <[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 Blind transfer by caller channel
 *
 * \author Alexei Gradinari <[email protected]>
 *
 * \ingroup applications
 */

/*** MODULEINFO
   <support_level>extended</support_level>
 ***/

#include "asterisk.h"

#include "asterisk/pbx.h"
#include "asterisk/module.h"
#include "asterisk/app.h"
#include "asterisk/channel.h"
#include "asterisk/bridge.h"

/*** DOCUMENTATION
   <application name="BlindTransfer" language="en_US">
      <synopsis>
         Blind transfer channel(s) to the extension and context provided
      </synopsis>
      <syntax>
         <parameter name="exten" required="true">
            <para>Specify extension.</para>
         </parameter>
         <parameter name="context">
            <para>Optionally specify a context.
            By default, Asterisk will use the caller channel context.</para>
         </parameter>
      </syntax>
      <description>
         <para>Redirect all channels currently bridged to the caller channel to the
         specified destination.</para>
         <para>The result of the application will be reported in the <variable>BLINDTRANSFERSTATUS</variable>
         channel variable:</para>
         <variablelist>
            <variable name="BLINDTRANSFERSTATUS">
               <value name="SUCCESS">
                  Transfer succeeded.
               </value>
               <value name="FAILURE">
                  Transfer failed.
               </value>
               <value name="INVALID">
                  Transfer invalid.
               </value>
               <value name="NOTPERMITTED">
                  Transfer not permitted.
               </value>
            </variable>
         </variablelist>
      </description>
   </application>
 ***/

static const char * const app = "BlindTransfer";

static int blind_transfer_exec(struct ast_channel *chan, const char *data)
{
   char *exten = NULL;
   char *context = NULL;
   char *parse;
   AST_DECLARE_APP_ARGS(args,
      AST_APP_ARG(exten);
      AST_APP_ARG(context);
   );

   if (ast_strlen_zero((char *)data)) {
      ast_log(LOG_WARNING, "%s requires an argument (exten)\n", app);
      pbx_builtin_setvar_helper(chan, "BLINDTRANSFERSTATUS", "FAILURE");
      return 0;
   }

   parse = ast_strdupa(data);
   AST_STANDARD_APP_ARGS(args, parse);

   exten = args.exten;
   if (ast_strlen_zero(args.context)) {
      context = (char *)ast_channel_context(chan);
   } else {
      context = args.context;
   }

   switch (ast_bridge_transfer_blind(1, chan, exten, context, NULL, NULL)) {
      case AST_BRIDGE_TRANSFER_NOT_PERMITTED:
         pbx_builtin_setvar_helper(chan, "BLINDTRANSFERSTATUS", "NOTPERMITTED");
         break;
      case AST_BRIDGE_TRANSFER_INVALID:
         pbx_builtin_setvar_helper(chan, "BLINDTRANSFERSTATUS", "INVALID");
         break;
      case AST_BRIDGE_TRANSFER_FAIL:
         pbx_builtin_setvar_helper(chan, "BLINDTRANSFERSTATUS", "FAILURE");
         break;
      case AST_BRIDGE_TRANSFER_SUCCESS:
         pbx_builtin_setvar_helper(chan, "BLINDTRANSFERSTATUS", "SUCCESS");
         break;
      default:
         pbx_builtin_setvar_helper(chan, "BLINDTRANSFERSTATUS", "FAILURE");
        }

   return 0;
}

static int unload_module(void)
{
   return ast_unregister_application(app);
}

static int load_module(void)
{
   return ast_register_application_xml(app, blind_transfer_exec);
}

AST_MODULE_INFO_STANDARD_EXTENDED(ASTERISK_GPL_KEY, "Blind transfer channel to the given destination");