app_readexten.c

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/*
 * Asterisk -- An open source telephony toolkit.
 *
 * Copyright (C) 2007-2008, Trinity College Computing Center
 * Written by David Chappell <David.Chappell@trincoll.edu>
 *
 * 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 Trivial application to read an extension into a variable
 *
 * \author David Chappell <David.Chappell@trincoll.edu>
 *
 * \ingroup applications
 */
 
/*** MODULEINFO
    <support_level>core</support_level>
 ***/
 
#include "asterisk.h"
 
#include "asterisk/file.h"
#include "asterisk/pbx.h"
#include "asterisk/app.h"
#include "asterisk/module.h"
#include "asterisk/indications.h"
#include "asterisk/channel.h"
 
/*** DOCUMENTATION
    <application name="ReadExten" language="en_US">
        <synopsis>
            Read an extension into a variable.
        </synopsis>
        <syntax>
            <parameter name="variable" required="true" />
            <parameter name="filename">
                <para>File to play before reading digits or tone with option <literal>i</literal></para>
            </parameter>
            <parameter name="context">
                <para>Context in which to match extensions.</para>
            </parameter>
            <parameter name="option">
                <optionlist>
                    <option name="s">
                        <para>Return immediately if the channel is not answered.</para>
                    </option>
                    <option name="i">
                        <para>Play <replaceable>filename</replaceable> as an indication tone from your
                        <filename>indications.conf</filename> or a directly specified list of
                        frequencies and durations.</para>
                    </option>
                    <option name="n">
                        <para>Read digits even if the channel is not answered.</para>
                    </option>
                    <option name="p">
                        <para>The extension entered will be considered complete when a <literal>#</literal>
                        is entered.</para>
                    </option>
                </optionlist>
            </parameter>
            <parameter name="timeout">
                <para>An integer number of seconds to wait for a digit response. If
                greater than <literal>0</literal>, that value will override the default timeout.</para>
            </parameter>
        </syntax>
        <description>
            <para>Reads a <literal>#</literal> terminated string of digits from the user into the given variable.</para>
            <para>Will set READEXTENSTATUS on exit with one of the following statuses:</para>
            <variablelist>
                <variable name="READEXTENSTATUS">
                    <value name="OK">
                        A valid extension exists in ${variable}.
                    </value>
                    <value name="TIMEOUT">
                        No extension was entered in the specified time.  Also sets ${variable} to "t".
                    </value>
                    <value name="INVALID">
                        An invalid extension, ${INVALID_EXTEN}, was entered.  Also sets ${variable} to "i".
                    </value>
                    <value name="SKIP">
                        Line was not up and the option 's' was specified.
                    </value>
                    <value name="ERROR">
                        Invalid arguments were passed.
                    </value>
                </variable>
            </variablelist>
        </description>
    </application>
 ***/
 
enum readexten_option_flags {
    OPT_SKIP = (1 << 0),
    OPT_INDICATION = (1 << 1),
    OPT_NOANSWER = (1 << 2),
    OPT_POUND_TO_END = (1 << 3),
};
 
AST_APP_OPTIONS(readexten_app_options, {
    AST_APP_OPTION('s', OPT_SKIP),
    AST_APP_OPTION('i', OPT_INDICATION),
    AST_APP_OPTION('n', OPT_NOANSWER),
    AST_APP_OPTION('p', OPT_POUND_TO_END),
});
 
static char *app = "ReadExten";
 
static int readexten_exec(struct ast_channel *chan, const char *data)
{
    int res = 0;
    char exten[256] = "";
    int maxdigits = sizeof(exten) - 1;
    int timeout = 0, digit_timeout = 0, x = 0;
    char *argcopy = NULL, *status = "";
    struct ast_tone_zone_sound *ts = NULL;
    struct ast_flags flags = {0};
 
     AST_DECLARE_APP_ARGS(arglist,
        AST_APP_ARG(variable);
        AST_APP_ARG(filename);
        AST_APP_ARG(context);
        AST_APP_ARG(options);
        AST_APP_ARG(timeout);
    );
 
    if (ast_strlen_zero(data)) {
        ast_log(LOG_WARNING, "ReadExten requires at least one argument\n");
        pbx_builtin_setvar_helper(chan, "READEXTENSTATUS", "ERROR");
        return 0;
    }
 
    argcopy = ast_strdupa(data);
    AST_STANDARD_APP_ARGS(arglist, argcopy);
 
    if (ast_strlen_zero(arglist.variable)) {
        ast_log(LOG_WARNING, "Usage: ReadExten(variable[,filename[,context[,options[,timeout]]]])\n");
        pbx_builtin_setvar_helper(chan, "READEXTENSTATUS", "ERROR");
        return 0;
    }
 
    if (ast_strlen_zero(arglist.filename)) {
        arglist.filename = NULL;
    }
 
    if (ast_strlen_zero(arglist.context)) {
        arglist.context = ast_strdupa(ast_channel_context(chan));
    }
 
    if (!ast_strlen_zero(arglist.options)) {
        ast_app_parse_options(readexten_app_options, &flags, NULL, arglist.options);
    }
 
    if (!ast_strlen_zero(arglist.timeout)) {
        timeout = atoi(arglist.timeout);
        if (timeout > 0)
            timeout *= 1000;
    }
 
    if (timeout <= 0)
        timeout = ast_channel_pbx(chan) ? ast_channel_pbx(chan)->rtimeoutms : 10000;
 
    digit_timeout = ast_channel_pbx(chan) ? ast_channel_pbx(chan)->dtimeoutms : 5000;
 
    if (ast_test_flag(&flags, OPT_INDICATION) && !ast_strlen_zero(arglist.filename)) {
        ts = ast_get_indication_tone(ast_channel_zone(chan), arglist.filename);
    }
 
    do {
        if (ast_channel_state(chan) != AST_STATE_UP) {
            if (ast_test_flag(&flags, OPT_SKIP)) {
                /* At the user's option, skip if the line is not up */
                pbx_builtin_setvar_helper(chan, arglist.variable, "");
                status = "SKIP";
                break;
            } else if (!ast_test_flag(&flags, OPT_NOANSWER)) {
                /* Otherwise answer unless we're supposed to read while on-hook */
                res = ast_answer(chan);
            }
        }
 
        if (res < 0) {
            status = "HANGUP";
            break;
        }
 
        ast_playtones_stop(chan);
        ast_stopstream(chan);
 
        if (ts && ts->data[0]) {
            res = ast_playtones_start(chan, 0, ts->data, 0);
        } else if (arglist.filename) {
            if (ast_test_flag(&flags, OPT_INDICATION) && ast_fileexists(arglist.filename, NULL, ast_channel_language(chan)) <= 0) {
                /*
                 * We were asked to play an indication that did not exist in the config.
                 * If no such file exists, play it as a tonelist.  With any luck they won't
                 * have a file named "350+440.ulaw"
                 * (but honestly, who would do something so silly?)
                 */
                res = ast_playtones_start(chan, 0, arglist.filename, 0);
            } else {
                res = ast_streamfile(chan, arglist.filename, ast_channel_language(chan));
            }
        }
 
        for (x = 0; x < maxdigits; x++) {
            ast_debug(3, "extension so far: '%s', timeout: %d\n", exten, timeout);
            res = ast_waitfordigit(chan, timeout);
 
            ast_playtones_stop(chan);
            ast_stopstream(chan);
            timeout = digit_timeout;
 
            if (res < 1) {      /* timeout expired or hangup */
                if (ast_check_hangup(chan)) {
                    status = "HANGUP";
                } else if (x == 0) {
                    pbx_builtin_setvar_helper(chan, arglist.variable, "t");
                    status = "TIMEOUT";
                }
                break;
            }
 
            if (ast_test_flag(&flags, OPT_POUND_TO_END) && res == '#') {
                exten[x] = 0;
                break;
            }
 
            exten[x] = res;
            if (!ast_matchmore_extension(chan, arglist.context, exten, 1 /* priority */,
                S_COR(ast_channel_caller(chan)->id.number.valid, ast_channel_caller(chan)->id.number.str, NULL))) {
                if (!ast_exists_extension(chan, arglist.context, exten, 1,
                    S_COR(ast_channel_caller(chan)->id.number.valid, ast_channel_caller(chan)->id.number.str, NULL))
                    && res == '#') {
                    exten[x] = '\0';
                }
                break;
            }
        }
 
        if (!ast_strlen_zero(status))
            break;
 
        if (ast_exists_extension(chan, arglist.context, exten, 1,
            S_COR(ast_channel_caller(chan)->id.number.valid, ast_channel_caller(chan)->id.number.str, NULL))) {
            ast_debug(3, "User entered valid extension '%s'\n", exten);
            pbx_builtin_setvar_helper(chan, arglist.variable, exten);
            status = "OK";
        } else {
            ast_debug(3, "User dialed invalid extension '%s' in context '%s' on %s\n", exten, arglist.context, ast_channel_name(chan));
            pbx_builtin_setvar_helper(chan, arglist.variable, "i");
            pbx_builtin_setvar_helper(chan, "INVALID_EXTEN", exten);
            status = "INVALID";
        }
    } while (0);
 
    if (ts) {
        ts = ast_tone_zone_sound_unref(ts);
    }
 
    pbx_builtin_setvar_helper(chan, "READEXTENSTATUS", status);
 
    return status[0] == 'H' ? -1 : 0;
}
 
static int unload_module(void)
{
    int res = ast_unregister_application(app);
    return res;
}
 
static int load_module(void)
{
    int res = ast_register_application_xml(app, readexten_exec);
    return res;
}
 
AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "Read and evaluate extension validity");