app_blind_transfer.c

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/*
 * Asterisk -- An open source telephony toolkit.
 *
 * Copyright (C) 2019, Alexei Gradinari
 *
 * Alexei Gradinari <alex2grad@gmail.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 Blind transfer by caller channel
 *
 * \author Alexei Gradinari <alex2grad@gmail.com>
 *
 * \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");