egroupware/phpgwapi/inc/class.common.inc.php

<?php
  /**************************************************************************\
  * phpGroupWare API - Commononly used functions                             *
  * This file written by Dan Kuykendall <seek3r@phpgroupware.org>            *
  * and Joseph Engo <jengo@phpgroupware.org>                                 *
  * and Mark Peters <skeeter@phpgroupware.org>                               *
  * Commononly used functions by phpGroupWare developers                     *
  * Copyright (C) 2000, 2001 Dan Kuykendall                                  *
  * -------------------------------------------------------------------------*
  * This library is part of the phpGroupWare API                             *
  * http://www.phpgroupware.org/api                                          * 
  * ------------------------------------------------------------------------ *
  * This library is free software; you can redistribute it and/or modify it  *
  * under the terms of the GNU Lesser General Public License as published by *
  * the Free Software Foundation; either version 2.1 of the License,         *
  * or any later version.                                                    *
  * This library is distributed in the hope that it will be useful, but      *
  * WITHOUT ANY WARRANTY; without even the implied warranty of               *
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.                     *
  * See the GNU Lesser General Public License for more details.              *
  * You should have received a copy of the GNU Lesser General Public License *
  * along with this library; if not, write to the Free Software Foundation,  *
  * Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA            *
  \**************************************************************************/

  /* $Id$ */

  $d1 = strtolower(substr($phpgw_info['server']['api_inc'],0,3));
  $d2 = strtolower(substr($phpgw_info['server']['server_root'],0,3));
  $d3 = strtolower(substr($phpgw_info['server']['app_inc'],0,3));
  if($d1 == 'htt' || $d1 == 'ftp' || $d2 == 'htt' || $d2 == 'ftp' || $d3 == 'htt' || $d3 == 'ftp') {
    echo 'Failed attempt to break in via an old Security Hole!<br>'."\n";
    exit;
  } unset($d1);unset($d2);unset($d3);

  class common
  {
    var $phpgw;
    var $iv = '';
    var $key = '';
    var $crypto;

    // Convert an array into the format needed for the access column.
    function array_to_string($access,$array)
    {
      $s = '';
      if ($access == 'group' || $access == 'public' || $access == 'none') {
         if (count($array)) {
            while ($t = each($array)) {
   			$s .= ',' . $t[1];
            }
            $s .= ',';
         }
         if (! count($array) && $access == 'none') {
            $s = '';
         }
      }
      return $s;
    }


    // This is used for searching the access fields
    function sql_search($table,$owner=0)
    {
      global $phpgw, $phpgw_info;

      $s = '';
      if (!$owner) {
         $owner = $phpgw_info['user']['account_id'];
      }
      $groups = $phpgw->accounts->memberships(intval($owner));
      if (gettype($groups) == 'array') {
         while ($group = each($groups)) {
           $s .= " or $table like '%," . $group[2] . ",%'";
        }
      }
      return $s;
    }

    // return a array of installed languages
    function getInstalledLanguages()
    {
    	global $phpgw;
    	
    	$phpgw->db->query('select distinct lang from lang');
    	while (@$phpgw->db->next_record()) 
    	{
    		$installedLanguages[$phpgw->db->f('lang')] = $phpgw->db->f('lang');
    	}   
    	
    	return $installedLanguages;
    }

    // return the preferred language of the users
    // it's using HTTP_ACCEPT_LANGUAGE (send from the users browser)
    // and ...(to find out which languages are installed)
    function getPreferredLanguage()
    {
        global $HTTP_ACCEPT_LANGUAGE;
        
        // create a array of languages the user is accepting
        $userLanguages = explode(',',$HTTP_ACCEPT_LANGUAGE);
        $supportedLanguages = $this->getInstalledLanguages();

	// find usersupported language
        while (list($key,$value) = each($userLanguages))
        {
        	// remove everything behind '-' example: de-de
                $value = trim($value);
                $pieces = explode('-', $value);
                $value = $pieces[0];
                # print 'current lang $value<br>';
                if ($supportedLanguages[$value])
                {
                        $retValue=$value;
                        break;
                }
        }

	// no usersupported language found -> return english
        if (empty($retValue))
        {
                $retValue='en';
        }
        
        return $retValue;
    }      

    // connect to the ldap server and return a handle
    function ldapConnect($host = '', $dn = '', $passwd = '')
    {
   	global $phpgw_info;
   	
   	if (! $host) {
   	   $host = $phpgw_info['server']['ldap_host'];
   	}

   	if (! $dn) {
   	   $dn = $phpgw_info['server']['ldap_root_dn'];
   	}

   	if (! $passwd) {
   	   $passwd = $phpgw_info['server']['ldap_root_passwd'];
   	}

	
   	// connect to ldap server
   	if (! $ds = ldap_connect($host)) {
  		printf("<b>Error: Can't connect to LDAP server %s!</b><br>",$host);
		  return False;
   	}

   	// bind as admin, we not to able to do everything
   	if (! ldap_bind($ds,$dn,$passwd)) {
  		printf("<b>Error: Can't bind to LDAP server: %s!</b><br>",$dn);
		  return False;
   	}

   	return $ds;
    }

    // This function is used if the developer wants to stop a running app in the middle of execution
    // We may need to do some clean up before hand
    function phpgw_exit($call_footer = False)
    {
       global $phpgw;

       if ($call_footer) {
          $this->phpgw_footer();
       }  
       $phpgw->db->disconnect();
       exit;
    }

    function randomstring($size)
    {
      $s = '';
      srand((double)microtime()*1000000);
      $random_char = array('0','1','2','3','4','5','6','7','8','9','a','b','c','d','e','f',
                           'g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v',
                           'w','x','y','z','A','B','C','D','E','F','G','H','I','J','K','L',
                           'M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z');

      for ($i=0; $i<$size; $i++) {
         $s .= $random_char[rand(1,61)];
      }
      return $s;    
    }

    // Look at the note towards the top of this file (jengo)
    function filesystem_separator()
    {
       return filesystem_separator();
    }

    function error_list($error)
    {
       $html_error = '<table border="0" width="50%"><tr><td align="right"><b>' . lang('error') . '</b>: </td><td align="left">' . $error[0] . '</td></tr>';

       for ($i=1; $i<count($error); $i++) {
          $html_error .= '<tr><td>&nbsp;</td><td align="left">' . $error[$i] . '</td></tr>';
       }
       return $html_error . '</table>';
    }

    function check_owner($record,$link,$label,$extravars = '')
    {
       global $phpgw, $phpgw_info;

       $s = '<a href="' . $phpgw->link($link,$extravars) . '"> ' . lang($label) . ' </a>';
       if (ereg("^[0-9]+$",$record)) {
          if ($record != $phpgw_info['user']['account_id']) {
             $s = "&nbsp;";
          }
       } else {
          if ($record != $phpgw_info['user']['userid']) {
             $s = "&nbsp";
          }
      }

      return $s;
    }    

    function display_fullname($lid = '', $firstname = '', $lastname = '')
    {
      if (! $lid && ! $firstname && ! $lastname) {
         global $phpgw_info;
         $lid       = $phpgw_info['user']['account_lid'];
         $firstname = $phpgw_info['user']['firstname'];
         $lastname  = $phpgw_info['user']['lastname'];
      }
    
      if (! $firstname && ! $lastname) {
         $s = $lid;
      }
      if (! $firstname && $lastname) {
         $s = $lastname;
      }
      if ($firstname && ! $lastname) {
         $s = $firstname;
      }
      if ($firstname && $lastname) {
         $s = "$lastname, $firstname";
      }
      return $s;
    }

    function grab_owner_name($id)
    {
      global $phpgw;

      $db = $phpgw->db;
      $db->query('select account_lid,account_firstname,account_lastname from phpgw_accounts where account_id='.$id,__LINE__,__FILE__);
      $db->next_record();

      return $phpgw->common->display_fullname($db->f('account_lid'),$db->f('account_firstname'),$db->f('account_lastname'));
    }  

    function create_tabs($tabs, $selected, $fontsize = '')
    {
       global $phpgw_info;
       $output_text = '<table border="0" cellspacing="0" cellpadding="0"><tr>';
       $ir = $phpgw_info['server']['images_dir'];

       if ($fontsize) {
          $fs  = '<font size="' . $fontsize . '">';
          $fse = '</font>';
       }

       $i = 1;
       while ($tab = each($tabs)) {
         if ($tab[0] == $selected) {
            if ($i == 1) {
               $output_text .= '<td align="right"><img src="' . $ir . '/tabs-start1.gif"></td>';
            }
     
            $output_text .= '<td align="left" background="' . $ir . '/tabs-bg1.gif">&nbsp;<b><a href="'
                          . $tab[1]['link'] . '" class="tablink">' . $fs . $tab[1]['label']
                          . $fse . '</a></b>&nbsp;</td>';
            if ($i == count($tabs)) {
               $output_text .= '<td align="left"><img src="' . $ir . '/tabs-end1.gif"></td>';
            } else {
               $output_text .= '<td align="left"><img src="' . $ir . '/tabs-sepr.gif"></td>';
            }
         } else {
            if ($i == 1) {
               $output_text .= '<td align="right"><img src="' . $ir . '/tabs-start0.gif"></td>';
            }
            $output_text .= '<td align="left" background="' . $ir . '/tabs-bg0.gif">&nbsp;<b><a href="'
                          . $tab[1]['link'] . '" class="tablink">' . $fs . $tab[1]['label'] . $fse
                          . '</a></b>&nbsp;</td>';
            if (($i + 1) == $selected) {
               $output_text .= '<td align="left"><img src="' . $ir . '/tabs-sepl.gif"></td>';
            } else if ($i == $selected || $i != count($tabs)) {
               $output_text .= '<td align="left"><img src="' . $ir . '/tabs-sepm.gif"></td>';
            } else if ($i == count($tabs)) {
               if ($i == $selected) {
                  $output_text .= '<td align="left"><img src="' . $ir . '/tabs-end1.gif"></td>';          
               } else {
                  $output_text .= '<td align="left"><img src="' . $ir . '/tabs-end0.gif"></td>';
               }
            } else {
               if ($i != count($tabs)) {
                  $output_text .= '<td align="left"><img src="' . $ir . '/tabs-sepr.gif"></td>';
               }
            }
         }
         $i++;
         $output_text .= "\n";
       }
       $output_text .= "</table>\n";
       return $output_text;
    }

    function get_app_dir($appname = ''){
      global $phpgw_info;
      if ($appname == '') { 
         $appname = $phpgw_info['flags']['currentapp'];
      }
      if ($appname == 'home' || $appname == 'logout' || $appname == 'login') {
         $appname = 'phpgwapi';
      }

      $appdir         = PHPGW_INCLUDE_ROOT . '/'.$appname;
      $appdir_default = PHPGW_SERVER_ROOT . '/'.$appname;

      if (is_dir ($appdir)){
        return $appdir;
      }elseif (is_dir ($appdir_default)){
        return $appdir_default;
      }else{
        return False;
      }      
    }

    function get_inc_dir($appname = '')
    {
       global $phpgw_info;
  
       if (! $appname){
          $appname = $phpgw_info['flags']['currentapp'];
       }
       if ($appname == 'home' || $appname == 'logout' || $appname == 'login') {
          $appname = 'phpgwapi';
       }
 
       $incdir         = PHPGW_INCLUDE_ROOT . '/' . $appname . '/inc';
       $incdir_default = PHPGW_SERVER_ROOT . '/' . $appname . '/inc';
 
       if (is_dir ($incdir)) {
          return $incdir;
       } elseif (is_dir ($incdir_default)) {
          return $incdir_default;
       } else {
          return False;
       }      
    }

    function list_themes()
    {
       $dh = opendir(PHPGW_SERVER_ROOT . '/phpgwapi/themes');
       while ($file = readdir($dh)) {
         if (eregi("\.theme$", $file)) {
            $list[] = substr($file,0,strpos($file,'.'));
         }
       }
       //$dh->close();
       reset ($list);
       return $list;
    }

    function list_templates(){
      global $phpgw_info;
      $d = dir(PHPGW_SERVER_ROOT . '/phpgwapi/templates');
      while ($entry=$d->read()) {
         if ($entry != 'CVS' && $entry != '.' && $entry != '..'){
            $list[$entry]['name'] = $entry;
            $f = PHPGW_SERVER_ROOT . '/phpgwapi/templates/' . $entry . '/details.inc.php';
            if (file_exists ($f)){
               include($f);
               $list[$entry]['title'] = 'Use '.$phpgw_info['template'][$entry]['title'].'interface';
            } else {
               $list[$entry]['title'] = $entry;
            }
         }
      }
      $d->close();
      reset ($list);
      return $list;
    }

    function get_tpl_dir($appname = '')
    {
       global $phpgw_info;
       if (! $appname) {
          $appname = $phpgw_info['flags']['currentapp'];
        }
        if ($appname == 'home' || $appname == 'logout' || $appname == 'login') {
           $appname = 'phpgwapi';
        }

        // Setting this for display of template choices in user preferences
        if ($phpgw_info['server']['template_set'] == 'user_choice') {
           $phpgw_info['server']['usrtplchoice'] = 'user_choice';
        }

        if ($phpgw_info['server']['template_set'] == 'user_choice' && isset($phpgw_info['user']['preferences']['common']['template_set'])) {
           $phpgw_info['server']['template_set'] = $phpgw_info['user']['preferences']['common']['template_set'];
        } elseif ($phpgw_info['server']['template_set'] == 'user_choice' || !isset($phpgw_info['server']['template_set'])) {
           $phpgw_info['server']['template_set'] = 'default';
        }

        $tpldir         = PHPGW_SERVER_ROOT . '/' . $appname . '/templates/'
                        . $phpgw_info['server']['template_set'];
        $tpldir_default = PHPGW_SERVER_ROOT . '/' . $appname . '/templates/default';

        if (is_dir($tpldir)) {
           return $tpldir;
        } elseif (is_dir($tpldir_default)) {
           return $tpldir_default;
        } else {
           return False;
        }      
    }

    function get_image_dir($appname = ''){
      global $phpgw_info;
      if ($appname == '') {
         $appname = $phpgw_info['flags']['currentapp'];
      }
      if (empty($phpgw_info['server']['template_set'])) {
         $phpgw_info['server']['template_set'] = 'default';
      }

      $imagedir            = PHPGW_SERVER_ROOT . '/' . $appname . '/templates/'
                           . $phpgw_info['server']['template_set'] . '/images';
      $imagedir_default    = PHPGW_SERVER_ROOT . '/' . $appname . '/templates/default/images';
      $imagedir_olddefault = PHPGW_SERVER_ROOT . '/' . $appname . '/images';

      if (is_dir ($imagedir)){
         return $imagedir;
      } elseif (is_dir ($imagedir_default)) {
         return $imagedir_default;
      } elseif (is_dir ($imagedir_olddefault)) {
         return $imagedir_olddefault;
      } else {
         return False;
      }      
    }

    function get_image_path($appname = ''){
      global $phpgw_info;
      if ($appname == '') {
         $appname = $phpgw_info['flags']['currentapp'];
      }
      if (empty($phpgw_info['server']['template_set'])) { 
         $phpgw_info['server']['template_set'] = 'default';
      }

      $imagedir            = PHPGW_SERVER_ROOT . '/'.$appname.'/templates/'.$phpgw_info['server']['template_set'].'/images';
      $imagedir_default    = PHPGW_SERVER_ROOT . '/'.$appname.'/templates/default/images';
      $imagedir_olddefault = PHPGW_SERVER_ROOT . '/'.$appname.'/images';

      if (is_dir ($imagedir)){
        return $phpgw_info['server']['webserver_url'].'/'.$appname.'/templates/'.$phpgw_info['server']['template_set'].'/images';
      }elseif (is_dir ($imagedir_default)){
        return $phpgw_info['server']['webserver_url'].'/'.$appname.'/templates/default/images';
      }elseif (is_dir ($imagedir_olddefault)){
        return $phpgw_info['server']['webserver_url'].'/'.$appname.'/images';
      }else{
        return False;
      }      
    }

    function navbar()
    {    
       global $phpgw_info, $phpgw;

       $phpgw_info['navbar']['home']['title'] = 'Home';
       $phpgw_info['navbar']['home']['url']   = $phpgw->link($phpgw_info['server']['webserver_url'] . '/index.php');
       $phpgw_info['navbar']['home']['icon']  = $phpgw_info['server']['webserver_url'] . '/phpgwapi/templates/'
                                              . $phpgw_info['server']['template_set'] . '/images/home.gif';

       reset($phpgw_info['user']['apps']);
       while ($permission = each($phpgw_info['user']['apps'])) {
          if (is_long($permission[0])) { continue; }
          if ($phpgw_info['apps'][$permission[0]]['status'] != 2) {
             $phpgw_info['navbar'][$permission[0]]['title'] = $phpgw_info['apps'][$permission[0]]['title'];
             $phpgw_info['navbar'][$permission[0]]['url']   = $phpgw->link($phpgw_info['server']['webserver_url']
                                                            . '/' . $permission[0] . '/index.php');
            $icon_file = PHPGW_SERVER_ROOT . '/'.$permission[0] . '/templates/'. $phpgw_info['server']['template_set']. '/images/navbar.gif';
            if (file_exists($icon_file)){
              $phpgw_info['navbar'][$permission[0]]['icon']  = $phpgw_info['server']['webserver_url'] . '/'
                . $permission[0] . '/templates/' . $phpgw_info['server']['template_set'] . '/images/navbar.gif';
            }else{
              $phpgw_info['navbar'][$permission[0]]['icon']  = $phpgw_info['server']['webserver_url'] . '/'
                . $permission[0] . '/templates/default/images/navbar.gif';
            }
          }
       }
       $phpgw_info['navbar']['preferences']['title'] = 'preferences';
       $phpgw_info['navbar']['preferences']['url']   = $phpgw->link($phpgw_info['server']['webserver_url']
                                                     . '/preferences/index.php');
       $phpgw_info['navbar']['preferences']['icon']  = $phpgw_info['server']['webserver_url'] . '/preferences/templates/'
                                                     . $phpgw_info['server']['template_set'] . '/images/navbar.gif';

       if ($phpgw_info['flags']['currentapp'] == 'home' || $phpgw_info['flags']['currentapp'] == 'preferences' || $phpgw_info['flags']['currentapp'] == 'about') {
          $app = 'phpGroupWare';
       } else {
          $app = $phpgw_info['flags']['currentapp'];
       }
       $phpgw_info['navbar']['about']['title'] = lang('About x',$app);      // We handle this here
                                                                            // becuase its special
       $phpgw_info['navbar']['about']['url']   = $phpgw->link($phpgw_info['server']['webserver_url']
                                               . '/about.php','app='.$app);
       $phpgw_info['navbar']['about']['icon']  = $phpgw_info['server']['webserver_url'] . '/phpgwapi/templates/'
                                               . $phpgw_info['server']['template_set'] . '/images/about.gif';

       $phpgw_info['navbar']['logout']['title'] = 'Logout';
       $phpgw_info['navbar']['logout']['url']   = $phpgw->link($phpgw_info['server']['webserver_url']
                                                . '/logout.php');
       $phpgw_info['navbar']['logout']['icon']  = $phpgw_info['server']['webserver_url'] . '/phpgwapi/templates/'
                                                . $phpgw_info['server']['template_set'] . '/images/logout.gif';
    }


    function app_header()
    {
       if (file_exists(PHPGW_APP_INC . '/header.inc.php')) {
          include(PHPGW_APP_INC . '/header.inc.php');
       }
    }

    function phpgw_header() {
      global $phpgw, $phpgw_info;

      include(PHPGW_INCLUDE_ROOT . '/phpgwapi/templates/' . $phpgw_info['server']['template_set']
                                 . '/head.inc.php');
      $this->navbar(False);
      include(PHPGW_INCLUDE_ROOT . '/phpgwapi/templates/' . $phpgw_info['server']['template_set']
                                 . '/navbar.inc.php');
      if ((! isset($phpgw_info['flags']['nonavbar']) || ! $phpgw_info['flags']['nonavbar']) && ! $phpgw_info['flags']['navbar_target']) {
         echo parse_navbar();
      }
    }

    function phpgw_footer()
    {
       global $phpgw, $phpgw_info, $HTMLCOMPLAINT;

       if (!isset($phpgw_info['flags']['nofooter']) || !$phpgw_info['flags']['nofooter']) {
          include(PHPGW_API_INC . '/footer.inc.php');
       }
 
       // Clean up mcrypt
       if (is_object($this->crypto)) {
          $this->crypto->cleanup();
          unset($this->crypto);
       }
    }

    function hex2bin($data)
    {
       $len = strlen($data);
       return pack('H' . $len, $data);
    }

    function encrypt($data) {
      global $phpgw_info, $phpgw;

      $data = serialize($data);
      return $phpgw->crypto->encrypt($data);
    }

    function decrypt($data) {
      global $phpgw_info, $phpgw;

      $data = $phpgw->crypto->decrypt($data);
      return unserialize($data);
    }

  function des_cryptpasswd($userpass, $random)
  {
    $lcrypt = "{crypt}";
    $password = crypt($userpass);
    $ldappassword = sprintf("%s%s", $lcrypt, $password);
 
    return $ldappassword;
  }

  function md5_cryptpasswd($userpass, $random)
  {
    $bsalt = "$1$";
    $esalt = "$";						// patch
    $lcrypt = "{crypt}";
//    $modsalt = sprintf("%s%s", $bsalt, $random);
    $modsalt = sprintf("%s%s%s", $bsalt, $random, $esalt);	// patch
    $password = crypt($userpass, $modsalt);
    $ldappassword = sprintf("%s%s", $lcrypt, $password);
  
    return $ldappassword;
  }    

  function encrypt_password($password)
  {
     global $phpgw, $phpgw_info;
     
     if ($phpgw_info['server']['ldap_encryption_type'] == 'DES') {
         $salt       = $this->randomstring(2);
         $e_password = $this->des_cryptpasswd($password, $salt);
      }
      if ($phpgw_info['server']['ldap_encryption_type'] == 'MD5') {
//         $salt       = $this->randomstring(9);
         $salt       = $this->randomstring(8);			// patch
         $e_password = $this->md5_cryptpasswd($password, $salt);
      }
      return $e_password;
  }

  function hook($location = '', $order = ''){
    global $phpgw, $phpgw_info;
    if ($order == ''){$order[] = $phpgw_info['flags']['currentapp'];}
    /* First include the ordered apps hook file */
    reset ($order);
    while (list (, $appname) = each ($order)){
       $f = PHPGW_SERVER_ROOT . '/' . $appname . '/inc/hook_'.$phpgw_info['flags']['currentapp'];
    	if ($location != '') {
    	   $f .= '_'.$location.'.inc.php';
    	} else {
    	   $f .= '.inc.php';
    	}
  	  if (file_exists($f)) {include($f);}
      $completed_hooks[$appname] = True;
    }
    /* Then add the rest */
    reset ($phpgw_info['user']['apps']);
    while ($permission = each($phpgw_info['user']['apps'])) {
       if ($completed_hooks[$permission[0]] != True){
          $appname = $permission[0];
          $f = PHPGW_SERVER_ROOT . '/' . $permission[0] . '/inc/hook_'.$phpgw_info['flags']['currentapp'];
      	if ($location != '') {
      	   $f .= '_'.$location.'.inc.php';
      	} else {
      	   $f .= '.inc.php';
      	}
    	  if (file_exists($f)) {
    	     include($f);
    	  }
      }
    }
  }

  function hook_single($location = '', $appname = '')
  {
     global $phpgw, $phpgw_info;
     if (! $appname) {
        $appname = $phpgw_info['flags']['currentapp'];
     }
     $s = $phpgw->common->filesystem_separator();
     /* First include the ordered apps hook file */
     $f = PHPGW_SERVER_ROOT . $s . $appname . $s . 'inc' . $s . 'hook_'.$appname;
     if ($location != '') {
        $f .= '_'.$location.'.inc.php';
     } else {
        $f .= '.inc.php';
     }
     if (file_exists($f)) {
        include($f);
        return True;
     } else {
        return False;
     }
  }

  function hook_count($location = ''){
    global $phpgw, $phpgw_info;
    $count = 0;
    reset($phpgw_info['user']['apps']);
    while ($permission = each($phpgw_info['user']['apps'])) {
      $f = PHPGW_SERVER_ROOT . '/' . $permission[0] . '/inc/hook_'.$phpgw_info['flags']['currentapp'];
    	if ($location != ''){$f .= '_'.$location.'.inc.php';}else{$f .= '.inc.php'; }
  	  if (file_exists($f)) {++$count;}
    }
    return $count;
  }

  /* Wrapper to the session->appsession() */
  function appsession($data = '##NOTHING##') {
    global $phpgw_info, $phpgw;
    return $phpgw->session->appsession($data);
  }

    function show_date($t = '', $format = '')
    {
      global $phpgw_info;

      if (! $t)
         $t = time();

      $t = $t + ((60*60) * $phpgw_info['user']['preferences']['common']['tz_offset']);

      if (! $format) {
         $format = $phpgw_info['user']['preferences']['common']['dateformat'] . ' - ';
         if ($phpgw_info['user']['preferences']['common']['timeformat'] == '12') {
            $format .= 'h:i:s a';
         } else {
            $format .= 'H:i:s';
         }
      }
      return date($format,$t);
    }

    function dateformatorder($yearstr,$monthstr,$daystr,$add_seperator = False)
    {
      global $phpgw_info;
      $dateformat = strtolower($phpgw_info['user']['preferences']['common']['dateformat']);
      $sep = substr($phpgw_info['user']['preferences']['common']['dateformat'],1,1);

      $dlarr[strpos($dateformat,'y')] = $yearstr;
      $dlarr[strpos($dateformat,'m')] = $monthstr;
      $dlarr[strpos($dateformat,'d')] = $daystr;
      ksort($dlarr);

      if ($add_seperator) {
         return (implode($sep,$dlarr));
      } else {
         return (implode(' ',$dlarr));      
      }
    } 

    function formattime($hour,$min,$sec='')
    {
      global $phpgw_info;

      $h12 = $hour;
      if ($phpgw_info['user']['preferences']['common']['timeformat'] == '12') {
         if ($hour > 12) 
            $ampm = ' pm';
         else
            $ampm = ' am';
         $h12 %= 12;
         if ($h12 == 0 && $hour)
            $h12 = 12;
         if ($h12 == 0 && ! $hour)
            $h12 = 0;
      } else 
         $h12 = $hour;

       if ($sec)
          $sec = ":$sec";

       return "$h12:$min$sec$ampm";
    }

    // This will be moved into the applications area.
    function check_code($code)
    {
      $s = '<br>';
      switch ($code)
      {
        case 13:	$s .= lang('Your message has been sent');break;
        case 14:	$s .= lang('New entry added sucessfully');break;
        case 15:	$s .= lang('Entry updated sucessfully');	break;
        case 16:	$s .= lang('Entry has been deleted sucessfully'); break;
        case 18:	$s .= lang('Password has been updated');	break;
        case 38:	$s .= lang('Password could not be changed');	break;
        case 19:	$s .= lang('Session has been killed');	break;
        case 27:	$s .= lang('Account has been updated');	break;
        case 28:	$s .= lang('Account has been created');	break;
        case 29:	$s .= lang('Account has been deleted');	break;
        case 30:	$s .= lang('Your settings have been updated'); break;
        case 31:	$s .= lang('Group has been added');	break;
        case 32:	$s .= lang('Group has been deleted');	break;
        case 33:	$s .= lang('Group has been updated');	break;
        case 34:    $s .= lang('Account has been deleted') . '<p>'
		             .  lang('Error deleting x x directory',lang('users'),' '.lang('private').' ') 
 		             .  ',<br>' . lang('Please x by hand',lang('delete')) . '<br><br>'
		             .  lang('To correct this error for the future you will need to properly set the')
		             .  '<br>' . lang('permissions to the files/users directory')
	          	   .  '<br>' . lang('On *nix systems please type: x','chmod 707 '
			        . $phpgw_info['server']['files_dir'] . '/users/'); 
       		break;
      case 35:	$s .= lang('Account has been updated') . '<p>'
		   .  lang('Error renaming x x directory',lang('users'),
		     ' '.lang('private').' ') 
		   .  ',<br>' . lang('Please x by hand',
		      lang('rename')) . '<br><br>'
		   .  lang('To correct this error for the future you will need to properly set the')
		   .  '<br>' . lang('permissions to the files/users directory')
		   .  '<br>' . lang('On *nix systems please type: x','chmod 707 '
			. $phpgw_info['server']['files_dir'] . '/users/'); 
		break;
      case 36:	$s .= lang('Account has been created') . '<p>'
		   .  lang('Error creating x x directory',lang('users'),
		     ' '.lang('private').' ') 
		   .  ',<br>' . lang('Please x by hand',
		      lang('create')) . '<br><br>'
		   .  lang('To correct this error for the future you will need to properly set the')
		   .  '<br>' . lang('permissions to the files/users directory')
		   .  '<br>' . lang('On *nix systems please type: x','chmod 707 '
			. $phpgw_info['server']['files_dir'] . '/users/'); 
		break;
      case 37:	$s .= lang('Group has been added') . '<p>'
		   .  lang('Error creating x x directory',lang('groups'),' ')
		   .  ',<br>' . lang('Please x by hand',
		      lang('create')) . '<br><br>'
		   .  lang('To correct this error for the future you will need to properly set the')
		   .  '<br>' . lang('permissions to the files/users directory')
		   .  '<br>' . lang('On *nix systems please type: x','chmod 707 '
			. $phpgw_info['server']['files_dir'] . '/groups/'); 
		break;
      case 38:	$s .= lang('Group has been deleted') . '<p>'
		   .  lang('Error deleting x x directory',lang('groups'),' ')
		   .  ',<br>' . lang('Please x by hand',
		      lang('delete')) . '<br><br>'
		   .  lang('To correct this error for the future you will need to properly set the')
		   .  '<br>' . lang('permissions to the files/users directory')
		   .  '<br>' . lang('On *nix systems please type: x','chmod 707 '
			. $phpgw_info['server']['files_dir'] . '/groups/'); 
		break;
      case 39:	$s .= lang('Group has been updated') . '<p>'
		   .  lang('Error renaming x x directory',lang('groups'),' ')
		   .  ',<br>' . lang('Please x by hand',
		      lang('rename')) . '<br><br>'
		   .  lang('To correct this error for the future you will need to properly set the')
		   .  '<br>' . lang('permissions to the files/users directory')
		   .  '<br>' . lang('On *nix systems please type: x','chmod 707 '
			. $phpgw_info['server']['files_dir'] . '/groups/'); 
		break;
      case 40: $s .= lang('You have not entered a\nBrief Description').'.';
		break;
      case 41: $s .= lang('You have not entered a\nvalid time of day.');
		break;
      case 42: $s .= lang('You have not entered a\nvalid date.');
		break;
      default:	return '';
    }
    return $s;
  }
    
    function phpgw_error($error,$line = '', $file = '') 
    {
       echo '<p><b>phpGroupWare internal error:</b><p>'.$error;
       if ($line) {
          echo 'Line: '.$line;
       }
       if ($file) {
          echo 'File: '.$file;
       }
       echo '<p>Your session has been halted.';
       exit;
    }


    function create_phpcode_from_array($array)
    {
       while (list($key, $val) = each($array)) {
          if (is_array($val)) {
             while (list($key2, $val2) = each($val)) {
                if (is_array($val2)) {
                   while (list($key3, $val3) = each ($val2)) {
                      if (is_array($val3)) {
                         while (list($key4, $val4) = each ($val3)) {
                            $s .= '$phpgw_info["' . $key . '"]["' . $key2 . '"]["' . $key3 . '"]["' .$key4 . '"]="' . $val4 . '";';
                            $s .= "\n";
                         }
                      } else {
                         $s .= '$phpgw_info["' . $key . '"]["' . $key2 . '"]["' . $key3 . '"]="' . $val3 . '";';
                         $s .= "\n";
                      }
                   }
                } else {
                   $s .= '$phpgw_info["' . $key .'"]["' . $key2 . '"]="' . $val2 . '";';
                   $s .= "\n";
                }
             }
          } else {
             $s .= '$phpgw_info["' . $key . '"]="' . $val . '";';
             $s .= "\n";
          }
       }
       return $s;
    }   


    // This will return the full phpgw_info array, used for debugging    
    function debug_list_array_contents($array)
    {
       while (list($key, $val) = each($array)) {
          if (is_array($val)) {
             while (list($key2, $val2) = each($val)) {
                if (is_array($val2)) {
                   while (list($key3, $val3) = each ($val2)) {
                      if (is_array($val3)) {
                         while (list($key4, $val4) = each ($val3)) {
                            echo $$array . "[$key][$key2][$key3][$key4]=$val4<br>";
                         }
                      } else {
                         echo $$array . "[$key][$key2][$key3]=$val3<br>";
                      }
                  }
                } else {
                  echo $$array . "[$key][$key2]=$val2<br>";
                }
             }
          } else {
             echo $$array . "[$key]=$val<br>";
          }
       }
    }
    
    // This will return a list of functions in the API
    function debug_list_core_functions()
    {
       echo '<br><b>core functions</b><br>';
       echo '<pre>';
       chdir(PHPGW_INCLUDE_ROOT . '/phpgwapi');
       system("grep -r '^[ \t]*function' *");
       echo '</pre>';
    }    
  }//end common class