htdocs/always.php

   1 <?php
   2 /**
   3 * @package davical
   4 * @author Andrew McMillan <andrew@mcmillan.net.nz>
   5 * @copyright Catalyst .Net Ltd, Morphoss Ltd <http://www.morphoss.com/>
   6 * @license   http://gnu.org/copyleft/gpl.html GNU GPL v2 or later
   7 */
   8
   9 if ( preg_match('{/always.php$}', $_SERVER['SCRIPT_NAME'] ) ) header('Location: index.php');
  10
  11 // Ensure the configuration starts out as an empty object.
  12 $c = (object) array();
  13 $c->script_start_time = microtime(true);
  14
  15 // Ditto for a few other global things
  16 unset($session); unset($request); unset($dbconn); unset($_awl_dbconn); unset($include_properties);
  17
  18 // An ultra-simple exception handler to catch errors that occur
  19 // before we get a more functional exception handler in place...
  20 function early_exception_handler($e) {
  21   echo "Exception [".$e->getCode()."] ".$e->getmessage()."\n";
  22   echo "At line ", $e->getLine(), " of ", $e->getFile(), "\n";
  23   echo "================= Stack Trace ===================\n";
  24
  25   $trace = array_reverse($e->getTrace());
  26   foreach( $trace AS $k => $v ) {
  27     printf( "%s[%d] %s%s%s()\n", $v['file'], $v['line'], (isset($v['class'])?$v['class']:''), (isset($v['type'])?$v['type']:''), (isset($v['function'])?$v['function']:'') );
  28   }
  29   @ob_flush();
  30 }
  31 set_exception_handler('early_exception_handler');
  32
  33 // Default some of the configurable values
  34 $c->sysabbr     = 'davical';
  35 $c->admin_email = 'admin@davical.example.com';
  36 $c->system_name = 'DAViCal CalDAV Server';
  37 $c->domain_name = (isset($_SERVER['SERVER_NAME'])?$_SERVER['SERVER_NAME']:$_SERVER['SERVER_ADDR']);
  38 $c->save_time_zone_defs = true;
  39 $c->collections_always_exist = false;
  40 $c->allow_get_email_visibility = false;
  41 $c->permission_scan_depth = 2;
  42 $c->expand_pdo_parameters = true;
  43 $c->home_calendar_name    = 'calendar';
  44 $c->home_addressbook_name = 'addresses';
  45 $c->enable_row_linking = true;
  46 $c->enable_scheduling = false;
  47 $c->http_auth_mode = 'Basic';
  48 // $c->default_locale = array('es_MX', 'es_AR', 'es', 'pt');  // An array of locales to try, or just a single locale
  49 // $c->local_tzid = 'Pacific/Auckland';  // Perhaps we should read from /etc/timezone - I wonder how standard that is?
  50 $c->default_locale = 'en';
  51 $c->locale_path = '../locale';
  52 $c->base_url = preg_replace('#/[^/]+\.php.*$#', '', $_SERVER['SCRIPT_NAME']);
  53 $c->base_directory = preg_replace('#/[^/]*$#', '', $_SERVER['DOCUMENT_ROOT']);
  54 $c->default_privileges = array('read-free-busy', 'schedule-deliver');
  55
  56 $c->enable_auto_schedule = true;
  57
  58 $c->stylesheets = array( $c->base_url.'/davical.css' );
  59 $c->images      = $c->base_url . '/images';
  60
  61 // Add a default for newly created users
  62 $c->template_usr = array( 'active' => true,
  63                           'locale' => 'en_GB',
  64                           'date_format_type' => 'E',
  65                           'email_ok' => date('Y-m-d')
  66                         );
  67
  68 $c->hide_TODO = true;                      // VTODO only visible to collection owner
  69 $c->readonly_webdav_collections = true;    // WebDAV access is readonly
  70
  71 // Kind of private configuration values
  72 $c->total_query_time = 0;
  73
  74 $c->dbg = array();
  75
  76
  77 // Utilities
  78 if ( ! @include_once('AWLUtilities.php') ) {
  79   $try_paths = array(
  80         '../../awl/inc'
  81       , '/usr/share/awl/inc'        // Where it ends up on Debian
  82       , '/usr/share/php/awl/inc'    // Fedora's standard for PHP libraries
  83       , '/usr/local/share/awl/inc'
  84   );
  85   foreach( $try_paths AS $awl_include_path ) {
  86     if ( @file_exists($awl_include_path.'/AWLUtilities.php') ) {
  87       set_include_path( $awl_include_path. PATH_SEPARATOR. get_include_path());
  88       break;
  89     }
  90   }
  91   if ( ! @include_once('AWLUtilities.php') ) {
  92     echo "Could not find the AWL libraries. Are they installed? Check your include_path in php.ini!\n";
  93     @ob_flush(); exit(0);
  94   }
  95 }
  96
  97 // Ensure that ../inc is in our included paths as early as possible
  98 set_include_path( '../inc'. PATH_SEPARATOR. get_include_path());
  99
 100
 101 /** We actually discovered this and worked around it earlier, but we can't log it until the utilties are loaded */
 102 if ( !isset($_SERVER['SERVER_NAME']) ) {
 103   @dbg_error_log( 'WARN', "Your webserver is not setting the SERVER_NAME parameter. You may need to set \$c->domain_name in your configuration.  Using IP address meanhwhile..." );
 104 }
 105
 106 /**
 107 * Calculate the simplest form of reference to this page, excluding the PATH_INFO following the script name.
 108 */
 109 $c->protocol_server_port = sprintf( '%s://%s%s',
 110                  (isset($_SERVER['HTTPS']) && $_SERVER['HTTPS'] == 'on'? 'https' : 'http'),
 111                  $_SERVER['SERVER_NAME'],
 112                  (
 113                     ( (!isset($_SERVER['HTTPS']) || $_SERVER['HTTPS'] != 'on')
 114                                         && (!isset($_SERVER['SERVER_PORT']) || $_SERVER['SERVER_PORT'] == 80) )
 115                            || (isset($_SERVER['HTTPS']) && $_SERVER['HTTPS'] == 'on'
 116                                                         && (!isset($_SERVER['SERVER_PORT']) || $_SERVER['SERVER_PORT'] == 443) )
 117                    ? ''
 118                    : ':'.$_SERVER['SERVER_PORT']
 119                  ) );
 120 $c->protocol_server_port_script = $c->protocol_server_port . ($_SERVER['SCRIPT_NAME'] == '/index.php' ? '' : $_SERVER['SCRIPT_NAME']);
 121
 122
 123 /**
 124 * We use @file_exists because things like open_basedir might noisily deny
 125 * access which could break DAViCal completely by causing output to start
 126 * too early.
 127 */
 128 ob_start( );
 129 if ( @file_exists('/etc/davical/'.$_SERVER['SERVER_NAME'].'-conf.php') ) {
 130   include('/etc/davical/'.$_SERVER['SERVER_NAME'].'-conf.php');
 131 }
 132 else if ( @file_exists('/etc/davical/config.php') ) {
 133   include('/etc/davical/config.php');
 134 }
 135 else if ( @file_exists('/usr/local/etc/davical/'.$_SERVER['SERVER_NAME'].'-conf.php') ) {
 136   include('/usr/local/etc/davical/'.$_SERVER['SERVER_NAME'].'-conf.php');
 137 }
 138 else if ( @file_exists('/usr/local/etc/davical/config.php') ) {
 139   include('/usr/local/etc/davical/config.php');
 140 }
 141 else if ( @file_exists('../config/config.php') ) {
 142   include('../config/config.php');
 143 }
 144 else if ( @file_exists('config/config.php') ) {
 145   include('config/config.php');
 146 }
 147 else {
 148   include('davical_configuration_missing.php');
 149   @ob_flush();  exit(0);
 150 }
 151 $config_warnings = trim(ob_get_contents());
 152 ob_end_clean();
 153
 154 if ( !isset($c->page_title) ) $c->page_title = $c->system_name;
 155
 156 if ( isset($_SERVER['HTTP_X_DAVICAL_TESTCASE']) ) {
 157   @dbg_error_log( 'LOG', '==========> Test case =%s=', $_SERVER['HTTP_X_DAVICAL_TESTCASE'] );
 158 }
 159 else if ( isset($c->dbg['script_start']) && $c->dbg['script_start'] ) {
 160   // Only log this if more than a little debugging of some sort is turned on, somewhere
 161   @dbg_error_log( 'LOG', '==========> method =%s= =%s= =%s= =%s= =%s=',
 162          $_SERVER['REQUEST_METHOD'], $c->protocol_server_port_script, $_SERVER['PATH_INFO'], $c->base_url, $c->base_directory );
 163 }
 164
 165 /**
 166 * Now that we have loaded the configuration file we can switch to a
 167 * default site locale.  This may be overridden by each user.
 168 */
 169 putenv("LANG=". $c->default_locale);
 170 awl_set_locale($c->default_locale);
 171 init_gettext( 'davical', $c->locale_path );
 172
 173 /**
 174 * Work out our version
 175 *
 176 */
 177 $c->code_version = 0;
 178 $c->want_awl_version = '0.50';
 179 $c->version_string = '1.0.1'; // The actual version # is replaced into that during the build /release process
 180 if ( isset($c->version_string) && preg_match( '/(\d+)\.(\d+)\.(\d+)(.*)/', $c->version_string, $matches) ) {
 181   $c->code_major = $matches[1];
 182   $c->code_minor = $matches[2];
 183   $c->code_patch = $matches[3];
 184   $c->code_version = (($c->code_major * 1000) + $c->code_minor).'.'.$c->code_patch;
 185   dbg_error_log('caldav', 'Version (%d.%d.%d) == %s', $c->code_major, $c->code_minor, $c->code_patch, $c->code_version);
 186   header( sprintf('Server: %d.%d', $c->code_major, $c->code_minor) );
 187 }
 188
 189 /**
 190 * Force the domain name to what was in the configuration file
 191 */
 192 $_SERVER['SERVER_NAME'] = $c->domain_name;
 193
 194 require_once('AwlQuery.php');
 195
 196 $c->want_dbversion = array(1,2,11);
 197 $c->schema_version = 0;
 198 $qry = new AwlQuery( 'SELECT schema_major, schema_minor, schema_patch FROM awl_db_revision ORDER BY schema_id DESC LIMIT 1;' );
 199 if ( $qry->Exec('always',__LINE__,__FILE__) && $row = $qry->Fetch() ) {
 200   $c->schema_version = doubleval( sprintf( '%d%03d.%03d', $row->schema_major, $row->schema_minor, $row->schema_patch) );
 201   $c->wanted_version = doubleval( sprintf( '%d%03d.%03d', $c->want_dbversion[0], $c->want_dbversion[1], $c->want_dbversion[2]) );
 202   $c->schema_major = $row->schema_major;
 203   $c->schema_minor = $row->schema_minor;
 204   $c->schema_patch = $row->schema_patch;
 205   if ( $c->schema_version < $c->wanted_version ) {
 206     $c->messages[] = sprintf( 'Database schema needs upgrading. Current: %d.%d.%d, Desired: %d.%d.%d',
 207              $row->schema_major, $row->schema_minor, $row->schema_patch, $c->want_dbversion[0], $c->want_dbversion[1], $c->want_dbversion[2]);
 208   }
 209   if ( isset($_SERVER['HTTP_X_DAVICAL_TESTCASE']) ) $qry->QDo('SET TIMEZONE TO \'Pacific/Auckland\'');
 210 }
 211
 212 require_once('Principal.php');
 213
 214 /**
 215  * Return the HTTP status code description for a given code. Hopefully
 216  * this is an efficient way to code this.
 217  * @return string The text for a give HTTP status code, in english
 218  */
 219 function getStatusMessage($status) {
 220   switch( $status ) {
 221     case 100:  $ans = 'Continue';                             break;
 222     case 101:  $ans = 'Switching Protocols';                  break;
 223     case 200:  $ans = 'OK';                                   break;
 224     case 201:  $ans = 'Created';                              break;
 225     case 202:  $ans = 'Accepted';                             break;
 226     case 203:  $ans = 'Non-Authoritative Information';        break;
 227     case 204:  $ans = 'No Content';                           break;
 228     case 205:  $ans = 'Reset Content';                        break;
 229     case 206:  $ans = 'Partial Content';                      break;
 230     case 207:  $ans = 'Multi-Status';                         break;
 231     case 300:  $ans = 'Multiple Choices';                     break;
 232     case 301:  $ans = 'Moved Permanently';                    break;
 233     case 302:  $ans = 'Found';                                break;
 234     case 303:  $ans = 'See Other';                            break;
 235     case 304:  $ans = 'Not Modified';                         break;
 236     case 305:  $ans = 'Use Proxy';                            break;
 237     case 307:  $ans = 'Temporary Redirect';                   break;
 238     case 400:  $ans = 'Bad Request';                          break;
 239     case 401:  $ans = 'Unauthorized';                         break;
 240     case 402:  $ans = 'Payment Required';                     break;
 241     case 403:  $ans = 'Forbidden';                            break;
 242     case 404:  $ans = 'Not Found';                            break;
 243     case 405:  $ans = 'Method Not Allowed';                   break;
 244     case 406:  $ans = 'Not Acceptable';                       break;
 245     case 407:  $ans = 'Proxy Authentication Required';        break;
 246     case 408:  $ans = 'Request Timeout';                      break;
 247     case 409:  $ans = 'Conflict';                             break;
 248     case 410:  $ans = 'Gone';                                 break;
 249     case 411:  $ans = 'Length Required';                      break;
 250     case 412:  $ans = 'Precondition Failed';                  break;
 251     case 413:  $ans = 'Request Entity Too Large';             break;
 252     case 414:  $ans = 'Request-URI Too Long';                 break;
 253     case 415:  $ans = 'Unsupported Media Type';               break;
 254     case 416:  $ans = 'Requested Range Not Satisfiable';      break;
 255     case 417:  $ans = 'Expectation Failed';                   break;
 256     case 422:  $ans = 'Unprocessable Entity';                 break;
 257     case 423:  $ans = 'Locked';                               break;
 258     case 424:  $ans = 'Failed Dependency';                    break;
 259     case 500:  $ans = 'Internal Server Error';                break;
 260     case 501:  $ans = 'Not Implemented';                      break;
 261     case 502:  $ans = 'Bad Gateway';                          break;
 262     case 503:  $ans = 'Service Unavailable';                  break;
 263     case 504:  $ans = 'Gateway Timeout';                      break;
 264     case 505:  $ans = 'HTTP Version Not Supported';           break;
 265     default:   $ans = 'Unknown HTTP Status Code '.$status;
 266   }
 267   return $ans;
 268 }
 269
 270
 271 /**
 272 * Construct a URL from the supplied dav_name.  The URL will be urlencoded,
 273 * except for any '/' characters in it.
 274 * @param string $partial_path  The part of the path after the script name
 275 */
 276 function ConstructURL( $partial_path, $force_script = false ) {
 277   global $c;
 278
 279   $partial_path = rawurlencode($partial_path);
 280   $partial_path = str_replace( '%2F', '/', $partial_path);
 281
 282   if ( ! isset($c->_url_script_path) ) {
 283     $c->protocol_server_port_script = str_replace( 'index.php', 'caldav.php', $c->protocol_server_port_script);
 284     $c->_url_script_path = (preg_match('#/$#', $c->protocol_server_port_script) ? 'caldav.php' : '');
 285     $c->_url_script_path = $c->protocol_server_port_script . $c->_url_script_path;
 286   }
 287
 288   $url = $c->_url_script_path;
 289   if ( $force_script ) {
 290     if ( ! preg_match( '#/caldav\.php$#', $url ) ) $url .= '/caldav.php';
 291   }
 292   $url .= $partial_path;
 293   $url = preg_replace( '#^(https?://.+)//#', '$1/', $url );  // Ensure we don't double any '/'
 294   $url = preg_replace('#^https?://[^/]+#', '', $url );       // Remove any protocol + hostname portion
 295
 296   return $url;
 297 }
 298
 299
 300 /**
 301 * Deconstruct a dav_name from the supplied URL.  The dav_name will be urldecoded.
 302 *
 303 * @param string $partial_path  The part of the path after the script name
 304 */
 305 function DeconstructURL( $url, $force_script = false ) {
 306   global $c;
 307
 308   $dav_name = rawurldecode($url);
 309
 310   /** Allow a path like .../username/calendar.ics to translate into the calendar URL */
 311   if ( preg_match( '#^(/[^/]+/[^/]+).ics$#', $dav_name, $matches ) ) {
 312     $dav_name = $matches[1]. '/';
 313   }
 314
 315   /** remove any leading protocol/server/port/prefix... */
 316   if ( !isset($c->deconstruction_base_path) ) $c->deconstruction_base_path = ConstructURL('/');
 317   if ( preg_match( '%^(.*?)'.str_replace('%', '\\%',$c->deconstruction_base_path).'(.*)$%', $dav_name, $matches ) ) {
 318     if ( $matches[1] == '' || $matches[1] == $c->protocol_server_port ) {
 319       $dav_name = $matches[2];
 320     }
 321   }
 322
 323   /** strip doubled slashes */
 324   if ( strstr($dav_name,'//') ) $dav_name = preg_replace( '#//+#', '/', $dav_name);
 325
 326   if ( substr($dav_name,0,1) != '/' ) $dav_name = '/'.$dav_name;
 327
 328   return $dav_name;
 329 }
 330
 331
 332 /**
 333 * Convert a date from ISO format into the sad old HTTP format.
 334 * @param string $isodate The date to convert
 335 */
 336 function ISODateToHTTPDate( $isodate ) {
 337   // Use strtotime since strptime is not available on Windows platform.
 338   return( gmstrftime('%a, %d %b %Y %H:%M:%S GMT', strtotime($isodate)) );
 339 }
 340
 341 /**
 342 * Convert a date into ISO format into the sparkly new ISO format.
 343 * @param string $indate The date to convert
 344 */
 345 function DateToISODate( $indate, $in_utc=false ) {
 346   // Use strtotime since strptime is not available on Windows platform.
 347   if ( $in_utc ) return( gmdate('Ymd\THis\Z', strtotime($indate)) );
 348   return( date('c', strtotime($indate)) );
 349 }
 350
 351 /**
 352 * Given a privilege string, or an array of privilege strings, return a bit mask
 353 * of the privileges.
 354 * @param mixed $raw_privs The string (or array of strings) of privilege names
 355 * @return integer A bit mask of the privileges.
 356 */
 357 define("DAVICAL_MAXPRIV", "65535");
 358 define("DAVICAL_ADDRESSBOOK_MAXPRIV", "1023");
 359 function privilege_to_bits( $raw_privs ) {
 360   $out_priv = 0;
 361
 362   if ( gettype($raw_privs) == 'string' ) $raw_privs = array( $raw_privs );
 363
 364   if ( ! is_array($raw_privs) ) $raw_privs = array($raw_privs);
 365
 366   foreach( $raw_privs AS $priv ) {
 367     $trim_priv = trim(strtolower(preg_replace( '/^.*:/', '', $priv)));
 368     switch( $trim_priv ) {
 369       case 'read'                            : $out_priv |=     1;  break;
 370       case 'write-properties'                : $out_priv |=     2;  break;
 371       case 'write-content'                   : $out_priv |=     4;  break;
 372       case 'unlock'                          : $out_priv |=     8;  break;
 373       case 'read-acl'                        : $out_priv |=    16;  break;
 374       case 'read-current-user-privilege-set' : $out_priv |=    32;  break;
 375       case 'bind'                            : $out_priv |=    64;  break;
 376       case 'unbind'                          : $out_priv |=   128;  break;
 377       case 'write-acl'                       : $out_priv |=   256;  break;
 378       case 'read-free-busy'                  : $out_priv |=   512;  break;
 379       case 'schedule-deliver-invite'         : $out_priv |=  1024;  break;
 380       case 'schedule-deliver-reply'          : $out_priv |=  2048;  break;
 381       case 'schedule-query-freebusy'         : $out_priv |=  4096;  break;
 382       case 'schedule-send-invite'            : $out_priv |=  8192;  break;
 383       case 'schedule-send-reply'             : $out_priv |= 16384;  break;
 384       case 'schedule-send-freebusy'          : $out_priv |= 32768;  break;
 385
 386       /** Aggregates of Privileges */
 387       case 'write'                           : $out_priv |=   198;  break; // 2 + 4 + 64 + 128
 388       case 'schedule-deliver'                : $out_priv |=  7168;  break; // 1024 + 2048 + 4096
 389       case 'schedule-send'                   : $out_priv |= 57344;  break; // 8192 + 16384 + 32768
 390       case 'all'                             : $out_priv  = DAVICAL_MAXPRIV;  break;
 391       case 'fake_privilege_for_input'        : break;
 392       default:
 393         dbg_error_log( 'ERROR', 'Cannot convert privilege of "%s" into bits.', $priv );
 394
 395     }
 396   }
 397
 398   // 'all' will include future privileges
 399   if ( ($out_priv & DAVICAL_MAXPRIV) >= DAVICAL_MAXPRIV ) $out_priv = pow(2,24) - 1;
 400   return $out_priv;
 401 }
 402
 403
 404 /**
 405 * Given a bit mask of the privileges, will return an array of the
 406 * text values of privileges.
 407 * @param integer $raw_bits A bit mask of the privileges.
 408 * @return mixed The string (or array of strings) of privilege names
 409 */
 410 function bits_to_privilege( $raw_bits, $resourcetype = 'resource' ) {
 411   $out_priv = array();
 412
 413   if ( is_string($raw_bits) ) {
 414     $raw_bits = bindec($raw_bits);
 415   }
 416
 417   if ( ($raw_bits & DAVICAL_MAXPRIV) == DAVICAL_MAXPRIV ) $out_priv[] = 'all';
 418
 419   if ( ($raw_bits &   1) != 0 ) $out_priv[] = 'DAV::read';
 420   if ( ($raw_bits &   8) != 0 ) $out_priv[] = 'DAV::unlock';
 421   if ( ($raw_bits &  16) != 0 ) $out_priv[] = 'DAV::read-acl';
 422   if ( ($raw_bits &  32) != 0 ) $out_priv[] = 'DAV::read-current-user-privilege-set';
 423   if ( ($raw_bits & 256) != 0 ) $out_priv[] = 'DAV::write-acl';
 424   if ( ($resourcetype == 'calendar' || $resourcetype == 'proxy' || $resourcetype == '*') && ($raw_bits & 512) != 0 ) $out_priv[] = 'urn:ietf:params:xml:ns:caldav:read-free-busy';
 425
 426   if ( ($raw_bits & 198) != 0 ) {
 427     if ( ($raw_bits & 198) == 198 ) $out_priv[] = 'DAV::write';
 428     if ( ($raw_bits &   2) != 0 ) $out_priv[] = 'DAV::write-properties';
 429     if ( ($raw_bits &   4) != 0 ) $out_priv[] = 'DAV::write-content';
 430     if ( ($raw_bits &  64) != 0 ) $out_priv[] = 'DAV::bind';
 431     if ( ($raw_bits & 128) != 0 ) $out_priv[] = 'DAV::unbind';
 432   }
 433
 434   if ( ($resourcetype == 'schedule-inbox' || $resourcetype == '*') && ($raw_bits & 7168) != 0 ) {
 435     if ( ($raw_bits & 7168) == 7168 ) $out_priv[] = 'urn:ietf:params:xml:ns:caldav:schedule-deliver';
 436     if ( ($raw_bits & 1024) != 0 ) $out_priv[] = 'urn:ietf:params:xml:ns:caldav:schedule-deliver-invite';
 437     if ( ($raw_bits & 2048) != 0 ) $out_priv[] = 'urn:ietf:params:xml:ns:caldav:schedule-deliver-reply';
 438     if ( ($raw_bits & 4096) != 0 ) $out_priv[] = 'urn:ietf:params:xml:ns:caldav:schedule-query-freebusy';
 439   }
 440
 441   if ( ($resourcetype == 'schedule-outbox' || $resourcetype == '*') && ($raw_bits & 57344) != 0 ) {
 442     if ( ($raw_bits & 57344) == 57344 ) $out_priv[] = 'urn:ietf:params:xml:ns:caldav:schedule-send';
 443     if ( ($raw_bits &  8192) != 0 ) $out_priv[] = 'urn:ietf:params:xml:ns:caldav:schedule-send-invite';
 444     if ( ($raw_bits & 16384) != 0 ) $out_priv[] = 'urn:ietf:params:xml:ns:caldav:schedule-send-reply';
 445     if ( ($raw_bits & 32768) != 0 ) $out_priv[] = 'urn:ietf:params:xml:ns:caldav:schedule-send-freebusy';
 446   }
 447
 448 //  dbg_error_log( 'DAVResource', ' Privilege bit "%s" is "%s".', $raw_bits, implode(', ', $out_priv) );
 449
 450   return $out_priv;
 451 }
 452
 453
 454 /**
 455 * Returns the array of privilege names converted into XMLElements
 456 */
 457 function privileges_to_XML( $privilege_names, &$xmldoc=null ) {
 458   if ( !isset($xmldoc) && isset($GLOBALS['reply']) ) $xmldoc = $GLOBALS['reply'];
 459   $privileges = array();
 460   foreach( $privilege_names AS $k ) {
 461     $privilege = new XMLElement('privilege');
 462     if ( isset($xmldoc) )
 463       $xmldoc->NSElement($privilege,$k);
 464     else
 465       $privilege->NewElement($k);
 466     $privileges[] = $privilege;
 467   }
 468   return $privileges;
 469 }
 470