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"

ASTERISK_FILE_VERSION(__FILE__, "$Revision: 357542 $")

#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>
            </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),
};

AST_APP_OPTIONS(readexten_app_options, {
   AST_APP_OPTION('s', OPT_SKIP),
   AST_APP_OPTION('i', OPT_INDICATION),
   AST_APP_OPTION('n', OPT_NOANSWER),
});

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;

   if (digit_timeout <= 0)
      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;
         }

         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");