app_directory.c

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/*
 * Asterisk -- An open source telephony toolkit.
 *
 * Copyright (C) 1999 - 2005, Digium, Inc.
 *
 * Mark Spencer <markster@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 Provide a directory of extensions
 *
 * \author Mark Spencer <markster@digium.com>
 *
 * \ingroup applications
 */

/*** MODULEINFO
   <depend>app_voicemail</depend>
 ***/
#include "asterisk.h"

ASTERISK_FILE_VERSION(__FILE__, "$Revision: 234895 $")

#include <ctype.h>

#include "asterisk/paths.h" /* use ast_config_AST_SPOOL_DIR */
#include "asterisk/file.h"
#include "asterisk/pbx.h"
#include "asterisk/module.h"
#include "asterisk/say.h"
#include "asterisk/app.h"
#include "asterisk/utils.h"

static char *app = "Directory";

static char *synopsis = "Provide directory of voicemail extensions";
static char *descrip =
"  Directory(vm-context[,dial-context[,options]]): This application will present\n"
"the calling channel with a directory of extensions from which they can search\n"
"by name. The list of names and corresponding extensions is retrieved from the\n"
"voicemail configuration file, voicemail.conf.\n"
"  This application will immediately exit if one of the following DTMF digits are\n"
"received and the extension to jump to exists:\n"
"    0 - Jump to the 'o' extension, if it exists.\n"
"    * - Jump to the 'a' extension, if it exists.\n\n"
"  Parameters:\n"
"    vm-context   - This is the context within voicemail.conf to use for the\n"
"                   Directory.\n"
"    dial-context - This is the dialplan context to use when looking for an\n"
"                   extension that the user has selected, or when jumping to the\n"
"                   'o' or 'a' extension.\n\n"
"  Options:\n"
"    e           In addition to the name, also read the extension number to the\n"
"              caller before presenting dialing options.\n"
"    f[(<n>)]    Allow the caller to enter the first name of a user in the\n"
"              directory instead of using the last name.  If specified, the\n"
"              optional number argument will be used for the number of\n"
"              characters the user should enter.\n"
"    l[(<n>)]    Allow the caller to enter the last name of a user in the\n"
"              directory.  This is the default.  If specified, the\n"
"              optional number argument will be used for the number of\n"
"              characters the user should enter.\n"
"    b[(<n>)]    Allow the caller to enter either the first or the last name\n"
"              of a user in the directory.  If specified, the optional number\n"
"              argument will be used for the number of characters the user\n"
"              should enter.\n"
"    m           Instead of reading each name sequentially and asking for\n"
"              confirmation, create a menu of up to 8 names.\n"
"    p(<n>)      Pause for n milliseconds after the digits are typed.  This is\n"
"              helpful for people with cellphones, who are not holding the\n"
"              receiver to their ear while entering DTMF.\n"
"\n"
"    Only one of the f, l, or b options may be specified.  If more than one is\n"
"    specified, then Directory will act as if 'b' was specified.  The number\n"
"    of characters for the user to type defaults to 3.\n";

/* For simplicity, I'm keeping the format compatible with the voicemail config,
   but i'm open to suggestions for isolating it */

#define VOICEMAIL_CONFIG "voicemail.conf"

enum {
   OPT_LISTBYFIRSTNAME = (1 << 0),
   OPT_SAYEXTENSION =    (1 << 1),
   OPT_FROMVOICEMAIL =   (1 << 2),
   OPT_SELECTFROMMENU =  (1 << 3),
   OPT_LISTBYLASTNAME =  (1 << 4),
   OPT_LISTBYEITHER =    OPT_LISTBYFIRSTNAME | OPT_LISTBYLASTNAME,
   OPT_PAUSE =           (1 << 5),
} directory_option_flags;

enum {
   OPT_ARG_FIRSTNAME =   0,
   OPT_ARG_LASTNAME =    1,
   OPT_ARG_EITHER =      2,
   OPT_ARG_PAUSE =       3,
   /* This *must* be the last value in this enum! */
   OPT_ARG_ARRAY_SIZE =  4,
};

struct directory_item {
   char exten[AST_MAX_EXTENSION + 1];
   char name[AST_MAX_EXTENSION + 1];
   char key[50]; /* Text to order items. Either lastname+firstname or firstname+lastname */

   AST_LIST_ENTRY(directory_item) entry;
};

AST_APP_OPTIONS(directory_app_options, {
   AST_APP_OPTION_ARG('f', OPT_LISTBYFIRSTNAME, OPT_ARG_FIRSTNAME),
   AST_APP_OPTION_ARG('l', OPT_LISTBYLASTNAME, OPT_ARG_LASTNAME),
   AST_APP_OPTION_ARG('b', OPT_LISTBYEITHER, OPT_ARG_EITHER),
   AST_APP_OPTION_ARG('p', OPT_PAUSE, OPT_ARG_PAUSE),
   AST_APP_OPTION('e', OPT_SAYEXTENSION),
   AST_APP_OPTION('v', OPT_FROMVOICEMAIL),
   AST_APP_OPTION('m', OPT_SELECTFROMMENU),
});

static int compare(const char *text, const char *template)
{
   char digit;

   if (ast_strlen_zero(text)) {
      return -1;
   }

   while (*template) {
      digit = toupper(*text++);
      switch (digit) {
      case 0:
         return -1;
      case '1':
         digit = '1';
         break;
      case '2':
      case 'A':
      case 'B':
      case 'C':
         digit = '2';
         break;
      case '3':
      case 'D':
      case 'E':
      case 'F':
         digit = '3';
         break;
      case '4':
      case 'G':
      case 'H':
      case 'I':
         digit = '4';
         break;
      case '5':
      case 'J':
      case 'K':
      case 'L':
         digit = '5';
         break;
      case '6':
      case 'M':
      case 'N':
      case 'O':
         digit = '6';
         break;
      case '7':
      case 'P':
      case 'Q':
      case 'R':
      case 'S':
         digit = '7';
         break;
      case '8':
      case 'T':
      case 'U':
      case 'V':
         digit = '8';
         break;
      case '9':
      case 'W':
      case 'X':
      case 'Y':
      case 'Z':
         digit = '9';
         break;

      default:
         if (digit > ' ')
            return -1;
         continue;
      }

      if (*template++ != digit)
         return -1;
   }

   return 0;
}

/* play name of mailbox owner.
 * returns:  -1 for bad or missing extension
 *           '1' for selected entry from directory
 *           '*' for skipped entry from directory
 */
static int play_mailbox_owner(struct ast_channel *chan, const char *context,
   const char *ext, const char *name, struct ast_flags *flags)
{
   int res = 0;
   if ((res = ast_app_sayname(chan, ext, context)) >= 0) {
      ast_stopstream(chan);
      /* If Option 'e' was specified, also read the extension number with the name */
      if (ast_test_flag(flags, OPT_SAYEXTENSION)) {
         ast_stream_and_wait(chan, "vm-extension", AST_DIGIT_ANY);
         res = ast_say_character_str(chan, ext, AST_DIGIT_ANY, chan->language);
      }
   } else {
      res = ast_say_character_str(chan, S_OR(name, ext), AST_DIGIT_ANY, chan->language);
      if (!ast_strlen_zero(name) && ast_test_flag(flags, OPT_SAYEXTENSION)) {
         ast_stream_and_wait(chan, "vm-extension", AST_DIGIT_ANY);
         res = ast_say_character_str(chan, ext, AST_DIGIT_ANY, chan->language);
      }
   }

   return res;
}

static int select_entry(struct ast_channel *chan, const char *context, const char *dialcontext, const struct directory_item *item, struct ast_flags *flags)
{
   ast_debug(1, "Selecting '%s' - %s@%s\n", item->name, item->exten, dialcontext);

   if (ast_test_flag(flags, OPT_FROMVOICEMAIL)) {
      /* We still want to set the exten though */
      ast_copy_string(chan->exten, item->exten, sizeof(chan->exten));
   } else if (ast_goto_if_exists(chan, dialcontext, item->exten, 1)) {
      ast_log(LOG_WARNING,
         "Can't find extension '%s' in context '%s'.  "
         "Did you pass the wrong context to Directory?\n",
         item->exten, dialcontext);
      return -1;
   }

   return 0;
}

static int select_item_seq(struct ast_channel *chan, struct directory_item **items, int count, const char *context, const char *dialcontext, struct ast_flags *flags)
{
   struct directory_item *item, **ptr;
   int i, res, loop;

   for (ptr = items, i = 0; i < count; i++, ptr++) {
      item = *ptr;

      for (loop = 3 ; loop > 0; loop--) {
         res = play_mailbox_owner(chan, context, item->exten, item->name, flags);

         if (!res)
            res = ast_stream_and_wait(chan, "dir-instr", AST_DIGIT_ANY);
         if (!res)
            res = ast_waitfordigit(chan, 3000);
         ast_stopstream(chan);
   
         if (res == '1') { /* Name selected */
            return select_entry(chan, context, dialcontext, item, flags) ? -1 : 1;
         } else if (res == '*') {
            /* Skip to next match in list */
            break;
         }

         if (res < 0)
            return -1;

         res = 0;
      }
   }

   /* Nothing was selected */
   return 0;
}

static int select_item_menu(struct ast_channel *chan, struct directory_item **items, int count, const char *context, const char *dialcontext, struct ast_flags *flags)
{
   struct directory_item **block, *item;
   int i, limit, res = 0;
   char buf[9];

   for (block = items; count; block += limit, count -= limit) {
      limit = count;
      if (limit > 8)
         limit = 8;

      for (i = 0; i < limit && !res; i++) {
         item = block[i];

         snprintf(buf, sizeof(buf), "digits/%d", i + 1);
         /* Press <num> for <name>, [ extension <ext> ] */
         res = ast_streamfile(chan, "dir-multi1", chan->language);
         if (!res)
            res = ast_waitstream(chan, AST_DIGIT_ANY);
         if (!res)
            res = ast_streamfile(chan, buf, chan->language);
         if (!res)
            res = ast_waitstream(chan, AST_DIGIT_ANY);
         if (!res)
            res = ast_streamfile(chan, "dir-multi2", chan->language);
         if (!res)
            res = ast_waitstream(chan, AST_DIGIT_ANY);
         if (!res)
            res = play_mailbox_owner(chan, context, item->exten, item->name, flags);
         if (!res)
            res = ast_waitstream(chan, AST_DIGIT_ANY);
         if (!res)
            res = ast_waitfordigit(chan, 800);
      }

      /* Press "9" for more names. */
      if (!res && count > limit) {
         res = ast_streamfile(chan, "dir-multi9", chan->language);
         if (!res)
            res = ast_waitstream(chan, AST_DIGIT_ANY);
      }

      if (!res) {
         res = ast_waitfordigit(chan, 3000);
      }

      if (res && res > '0' && res < '1' + limit) {
         return select_entry(chan, context, dialcontext, block[res - '1'], flags) ? -1 : 1;
      }

      if (res < 0)
         return -1;

      res = 0;
   }

   /* Nothing was selected */
   return 0;
}

static struct ast_config *realtime_directory(char *context)
{
   struct ast_config *cfg;
   struct ast_config *rtdata;
   struct ast_category *cat;
   struct ast_variable *var;
   char *mailbox;
   const char *fullname;
   const char *hidefromdir;
   char tmp[100];
   struct ast_flags config_flags = { 0 };

   /* Load flat file config. */
   cfg = ast_config_load(VOICEMAIL_CONFIG, config_flags);

   if (!cfg) {
      /* Loading config failed. */
      ast_log(LOG_WARNING, "Loading config failed.\n");
      return NULL;
   }

   /* Get realtime entries, categorized by their mailbox number
      and present in the requested context */
   rtdata = ast_load_realtime_multientry("voicemail", "mailbox LIKE", "%", "context", context, SENTINEL);

   /* if there are no results, just return the entries from the config file */
   if (!rtdata)
      return cfg;

   /* Does the context exist within the config file? If not, make one */
   cat = ast_category_get(cfg, context);
   if (!cat) {
      cat = ast_category_new(context, "", 99999);
      if (!cat) {
         ast_log(LOG_WARNING, "Out of memory\n");
         ast_config_destroy(cfg);
         if (rtdata) {
            ast_config_destroy(rtdata);
         }
         return NULL;
      }
      ast_category_append(cfg, cat);
   }

   mailbox = NULL;
   while ( (mailbox = ast_category_browse(rtdata, mailbox)) ) {
      fullname = ast_variable_retrieve(rtdata, mailbox, "fullname");
      if (ast_true((hidefromdir = ast_variable_retrieve(rtdata, mailbox, "hidefromdir")))) {
         /* Skip hidden */
         continue;
      }
      snprintf(tmp, sizeof(tmp), "no-password,%s", S_OR(fullname, ""));
      var = ast_variable_new(mailbox, tmp, "");
      if (var)
         ast_variable_append(cat, var);
      else
         ast_log(LOG_WARNING, "Out of memory adding mailbox '%s'\n", mailbox);
   }
   ast_config_destroy(rtdata);

   return cfg;
}

static int check_match(struct directory_item **result, const char *item_fullname, const char *item_ext, const char *pattern_ext, int use_first_name)
{
   struct directory_item *item;
   const char *key = NULL;
   int namelen;


   /* Set key to last name or first name depending on search mode */
   if (!use_first_name)
      key = strchr(item_fullname, ' ');

   if (key)
      key++;
   else
      key = item_fullname;

   if (compare(key, pattern_ext))
      return 0;

   /* Match */
   item = ast_calloc(1, sizeof(*item));
   if (!item)
      return -1;
   ast_copy_string(item->name, item_fullname, sizeof(item->name));
   ast_copy_string(item->exten, item_ext, sizeof(item->exten));

   ast_copy_string(item->key, key, sizeof(item->key));
   if (key != item_fullname) {
      /* Key is the last name. Append first name to key in order to sort Last,First */
      namelen = key - item_fullname - 1;
      if (namelen > sizeof(item->key) - strlen(item->key) - 1)
         namelen = sizeof(item->key) - strlen(item->key) - 1;
      strncat(item->key, item_fullname, namelen);
   }

   *result = item;
   return 1;
}

typedef AST_LIST_HEAD_NOLOCK(, directory_item) itemlist;

static int search_directory(const char *context, struct ast_config *vmcfg, struct ast_config *ucfg, const char *ext, struct ast_flags flags, itemlist *alist)
{
   struct ast_variable *v;
   char buf[AST_MAX_EXTENSION + 1], *pos, *bufptr, *cat;
   struct directory_item *item;
   int res;

   ast_debug(2, "Pattern: %s\n", ext);

   for (v = ast_variable_browse(vmcfg, context); v; v = v->next) {

      /* Ignore hidden */
      if (strcasestr(v->value, "hidefromdir=yes"))
         continue;

      ast_copy_string(buf, v->value, sizeof(buf));
      bufptr = buf;

      /* password,Full Name,email,pager,options */
      strsep(&bufptr, ",");
      pos = strsep(&bufptr, ",");

      /* No name to compare against */
      if (ast_strlen_zero(pos)) {
         continue;
      }

      res = 0;
      if (ast_test_flag(&flags, OPT_LISTBYLASTNAME)) {
         res = check_match(&item, pos, v->name, ext, 0 /* use_first_name */);
      }
      if (!res && ast_test_flag(&flags, OPT_LISTBYFIRSTNAME)) {
         res = check_match(&item, pos, v->name, ext, 1 /* use_first_name */);
      }

      if (!res)
         continue;
      else if (res < 0)
         return -1;

      AST_LIST_INSERT_TAIL(alist, item, entry);
   }

   if (ucfg) {
      for (cat = ast_category_browse(ucfg, NULL); cat ; cat = ast_category_browse(ucfg, cat)) {
         const char *position;
         if (!strcasecmp(cat, "general"))
            continue;
         if (!ast_true(ast_config_option(ucfg, cat, "hasdirectory")))
            continue;

         /* Find all candidate extensions */
         position = ast_variable_retrieve(ucfg, cat, "fullname");
         if (!position)
            continue;

         res = 0;
         if (ast_test_flag(&flags, OPT_LISTBYLASTNAME)) {
            res = check_match(&item, position, cat, ext, 0 /* use_first_name */);
         }
         if (!res && ast_test_flag(&flags, OPT_LISTBYFIRSTNAME)) {
            res = check_match(&item, position, cat, ext, 1 /* use_first_name */);
         }

         if (!res)
            continue;
         else if (res < 0)
            return -1;

         AST_LIST_INSERT_TAIL(alist, item, entry);
      }
   }
   return 0;
}

static void sort_items(struct directory_item **sorted, int count)
{
   int reordered, i;
   struct directory_item **ptr, *tmp;

   if (count < 2)
      return;

   /* Bubble-sort items by the key */
   do {
      reordered = 0;
      for (ptr = sorted, i = 0; i < count - 1; i++, ptr++) {
         if (strcasecmp(ptr[0]->key, ptr[1]->key) > 0) {
            tmp = ptr[0];
            ptr[0] = ptr[1];
            ptr[1] = tmp;
            reordered++;
         }
      }
   } while (reordered);
}

static int goto_exten(struct ast_channel *chan, const char *dialcontext, char *ext)
{
   if (!ast_goto_if_exists(chan, dialcontext, ext, 1) ||
      (!ast_strlen_zero(chan->macrocontext) &&
      !ast_goto_if_exists(chan, chan->macrocontext, ext, 1))) {
      return 0;
   } else {
      ast_log(LOG_WARNING, "Can't find extension '%s' in current context.  "
         "Not Exiting the Directory!\n", ext);
      return -1;
   }
}

static int do_directory(struct ast_channel *chan, struct ast_config *vmcfg, struct ast_config *ucfg, char *context, char *dialcontext, char digit, int digits, struct ast_flags *flags)
{
   /* Read in the first three digits..  "digit" is the first digit, already read */
   int res = 0;
   itemlist alist = AST_LIST_HEAD_NOLOCK_INIT_VALUE;
   struct directory_item *item, **ptr, **sorted = NULL;
   int count, i;
   char ext[10] = "";

   if (ast_strlen_zero(context)) {
      ast_log(LOG_WARNING,
         "Directory must be called with an argument "
         "(context in which to interpret extensions)\n");
      return -1;
   }

   if (digit == '0' && !goto_exten(chan, dialcontext, "o")) {
      return digit;
   }

   if (digit == '*' && !goto_exten(chan, dialcontext, "a")) {
      return digit;
   }

   ext[0] = digit;
   if (ast_readstring(chan, ext + 1, digits - 1, 3000, 3000, "#") < 0)
      return -1;

   res = search_directory(context, vmcfg, ucfg, ext, *flags, &alist);
   if (res)
      goto exit;

   /* Count items in the list */
   count = 0;
   AST_LIST_TRAVERSE(&alist, item, entry) {
      count++;
   }

   if (count < 1) {
      res = ast_streamfile(chan, "dir-nomatch", chan->language);
      goto exit;
   }


   /* Create plain array of pointers to items (for sorting) */
   sorted = ast_calloc(count, sizeof(*sorted));

   ptr = sorted;
   AST_LIST_TRAVERSE(&alist, item, entry) {
      *ptr++ = item;
   }

   /* Sort items */
   sort_items(sorted, count);

   if (option_debug) {
      ast_debug(2, "Listing matching entries:\n");
      for (ptr = sorted, i = 0; i < count; i++, ptr++) {
         ast_log(LOG_DEBUG, "%s: %s\n", ptr[0]->exten, ptr[0]->name);
      }
   }

   if (ast_test_flag(flags, OPT_SELECTFROMMENU)) {
      /* Offer multiple entries at the same time */
      res = select_item_menu(chan, sorted, count, context, dialcontext, flags);
   } else {
      /* Offer entries one by one */
      res = select_item_seq(chan, sorted, count, context, dialcontext, flags);
   }

   if (!res) {
      res = ast_streamfile(chan, "dir-nomore", chan->language);
   }

exit:
   if (sorted)
      ast_free(sorted);

   while ((item = AST_LIST_REMOVE_HEAD(&alist, entry)))
      ast_free(item);

   return res;
}

static int directory_exec(struct ast_channel *chan, void *data)
{
   int res = 0, digit = 3;
   struct ast_config *cfg, *ucfg;
   const char *dirintro;
   char *parse, *opts[OPT_ARG_ARRAY_SIZE] = { "", };
   struct ast_flags flags = { 0 };
   struct ast_flags config_flags = { 0 };
   enum { FIRST, LAST, BOTH } which = LAST;
   char digits[9] = "digits/3";
   AST_DECLARE_APP_ARGS(args,
      AST_APP_ARG(vmcontext);
      AST_APP_ARG(dialcontext);
      AST_APP_ARG(options);
   );

   if (ast_strlen_zero(data)) {
      ast_log(LOG_WARNING, "Directory requires an argument (context[,dialcontext])\n");
      return -1;
   }

   parse = ast_strdupa(data);

   AST_STANDARD_APP_ARGS(args, parse);

   if (args.options && ast_app_parse_options(directory_app_options, &flags, opts, args.options))
      return -1;

   if (ast_strlen_zero(args.dialcontext))
      args.dialcontext = args.vmcontext;

   cfg = realtime_directory(args.vmcontext);
   if (!cfg) {
      ast_log(LOG_ERROR, "Unable to read the configuration data!\n");
      return -1;
   }

   ucfg = ast_config_load("users.conf", config_flags);

   dirintro = ast_variable_retrieve(cfg, args.vmcontext, "directoryintro");
   if (ast_strlen_zero(dirintro))
      dirintro = ast_variable_retrieve(cfg, "general", "directoryintro");

   if (ast_test_flag(&flags, OPT_LISTBYFIRSTNAME) && ast_test_flag(&flags, OPT_LISTBYLASTNAME)) {
      if (!ast_strlen_zero(opts[OPT_ARG_EITHER])) {
         digit = atoi(opts[OPT_ARG_EITHER]);
      }
      which = BOTH;
   } else if (ast_test_flag(&flags, OPT_LISTBYFIRSTNAME)) {
      if (!ast_strlen_zero(opts[OPT_ARG_FIRSTNAME])) {
         digit = atoi(opts[OPT_ARG_FIRSTNAME]);
      }
      which = FIRST;
   } else {
      if (!ast_strlen_zero(opts[OPT_ARG_LASTNAME])) {
         digit = atoi(opts[OPT_ARG_LASTNAME]);
      }
      which = LAST;
   }

   /* If no options specified, search by last name */
   if (!ast_test_flag(&flags, OPT_LISTBYFIRSTNAME) && !ast_test_flag(&flags, OPT_LISTBYLASTNAME)) {
      ast_set_flag(&flags, OPT_LISTBYLASTNAME);
      which = LAST;
   }

   if (digit > 9) {
      digit = 9;
   } else if (digit < 1) {
      digit = 3;
   }
   digits[7] = digit + '0';

   if (chan->_state != AST_STATE_UP)
      res = ast_answer(chan);

   for (;;) {
      if (!ast_strlen_zero(dirintro) && !res) {
         res = ast_stream_and_wait(chan, dirintro, AST_DIGIT_ANY);
      } else if (!res) {
         /* Stop playing sounds as soon as we have a digit. */
         res = ast_stream_and_wait(chan, "dir-welcome", AST_DIGIT_ANY);
         if (!res) {
            res = ast_stream_and_wait(chan, "dir-pls-enter", AST_DIGIT_ANY);
         }
         if (!res) {
            res = ast_stream_and_wait(chan, digits, AST_DIGIT_ANY);
         }
         if (!res) {
            res = ast_stream_and_wait(chan, 
               which == FIRST ? "dir-first" :
               which == LAST ? "dir-last" :
               "dir-firstlast", AST_DIGIT_ANY);
         }
         if (!res) {
            res = ast_stream_and_wait(chan, "dir-usingkeypad", AST_DIGIT_ANY);
         }
      }
      ast_stopstream(chan);
      if (!res)
         res = ast_waitfordigit(chan, 5000);

      if (res <= 0)
         break;

      res = do_directory(chan, cfg, ucfg, args.vmcontext, args.dialcontext, res, digit, &flags);
      if (res)
         break;

      res = ast_waitstream(chan, AST_DIGIT_ANY);
      ast_stopstream(chan);

      if (res)
         break;
   }

   if (ucfg)
      ast_config_destroy(ucfg);
   ast_config_destroy(cfg);

   return res < 0 ? -1 : 0;
}

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

static int load_module(void)
{
   return ast_register_application(app, directory_exec, synopsis, descrip);
}

AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "Extension Directory");