* @copyright (c) 2009 by RalfBecker-At-outdoor-training.de * @license http://opensource.org/licenses/gpl-license.php GPL - GNU General Public License * @version $Id$ */ /** * Class for timezone information * * This class serves two purposes: * - convert between TZID strings and nummeric tz_id's stored in database * - get iCal VTIMEZONE component for a TZID (data from Lighting extension) * * Recommendations about timezone handling in calendars: * @link http://www.calconnect.org/publications/icalendartimezoneproblemsandrecommendationsv1.0.pdf * * Mapping Windows timezone to standard TZID's: * @link http://unicode.org/repos/cldr-tmp/trunk/diff/supplemental/windows_tzid.html * * UTC is treated specially: it's implicitly mapped to tz_id=-1 (to be able to store it for events), * but calendar_ical creates NO VTIMEZONE component for it. */ class calendar_timezones { /** * Methods callable via menuation * * @var array */ public $public_functions = array( 'update' => true, ); /** * Name of timezone table */ const TABLE = 'egw_cal_timezones'; /** * Cached timezone data (reference to session created by init_static) * * @var array id => data */ protected static $tz_cache = array(); /** * Cached timezone data (reference to session created by init_static) * * @var array tzid => id */ protected static $tz2id = array(); /** * Get DateTimeZone object for a given TZID * * We use our database to replace eg. Windows timezones not understood by PHP with their standard TZID * * @param string $tzid * @return DateTimeZone * @throws Exception if called with an unknown TZID */ public function DateTimeZone($tzid) { if (($id = self::tz2id($tzid,'alias'))) { $tzid = self::id2tz($id); } return new DateTimeZone($tzid); } /** * Get the nummeric id (or other data) for a given TZID * * Examples: * - calendar_timezone::tz2id('Europe/Berlin') returns nummeric id for given TZID * - calendar_timezone::tz2id('Europe/Berlin','component') returns VTIMEZONE component for given TZID * * @param string $tzid TZID * @param string $what='id' what to return, default id, null for whole array * @return int tz_id or null if not found */ public static function tz2id($tzid,$what='id') { $id =& self::$tz2id[$tzid]; if (!isset($id)) { if (($data = $GLOBALS['egw']->db->select(self::TABLE,'*',array( 'tz_tzid' => $tzid, ),__LINE__,__FILE__,false,'','calendar')->fetch())) { $id = $data['tz_id']; self::$tz_cache[$id] = egw_db::strip_array_keys($data,'tz_'); } } if (isset($id) && $what != 'id') { return self::id2tz($id,$what); } return $id; } /** * Get timezone data for a given nummeric id * * if NOT tzid or alias queried, we automatically resolve an evtl. alias * * Example: * - calendar_timezone::id2tz($id) returns TZID * - calendar_timezone::id2tz($id,'component') returns VTIMEZONE component for the given id * * @param int $id * @param string $what='tzid' what data to return or null for whole data array, with keys 'id', 'tzid', 'component', 'alias', 'latitude', 'longitude' * @return mixed false: if not found */ public static function id2tz($id,$what='tzid') { $data =& self::$tz_cache[$id]; if (!isset($data)) { if (($data = $GLOBALS['egw']->db->select(self::TABLE,'*',array( 'tz_id' => $id, ),__LINE__,__FILE__,false,'','calendar')->fetch())) { $data = egw_db::strip_array_keys($data,'tz_'); self::$tz2id[$data['tzid']] = $id; } } // if not tzid queried, resolve aliases automatically if ($data && $data['alias'] && $what != 'tzid' && $what != 'alias') { $data = self::id2tz($data['alias'],null); } return !$data ? $data : ($what ? $data[$what] : $data); } /** * Init static variables for session and check for updated timezone information * * As we use returned references from the session, we do NOT need to care about storing the information explicitly */ public static function init_static() { self::$tz_cache =& egw_cache::getSession(__CLASS__,'tz_cache'); self::$tz2id =& egw_cache::getSession(__CLASS__,'tz2id'); // init cache with mapping UTC <--> -1, as UTC is no real timezone, but we need to be able to use it in calendar if (!is_array(self::$tz2id)) { self::$tz_cache = array('-1' => array( 'tzid' => 'UTC', 'id' => -1, )); self::$tz2id = array('UTC' => -1); } // check for updated timezones once per session if (!egw_cache::getSession(__CLASS__, 'tzs_checked')) { try { $msg = self::import_sqlite($updated); if ($updated) error_log($msg); // log that timezones have been updated } catch (Exception $e) { _egw_log_exception($e); // log the exception to error_log, but do not stall program execution } egw_cache::setSession(__CLASS__, 'tzs_checked', true); } } /** * Import timezones from sqlite file * * @param boolean $updated=null on return true if update was neccessary, false if tz's were already up to date * @param string $file='calendar/setup/timezones.sqlite' filename relative to EGW_SERVER_ROOT * @param boolean $check_version=true true: check version and only act, if it's different * @return string message about update * @throws egw_exception_wrong_parameter if $file is not readable or wrong format/version * @throws egw_exception_assertion_failed if no PDO sqlite support * @throws egw_exception_wrong_userinput for broken sqlite extension */ public static function import_sqlite(&$updated=null,$file='calendar/setup/timezones.sqlite',$check_version=true) { $path = EGW_SERVER_ROOT.'/'.$file; if (!file_exists($path) || !is_readable($path)) { throw new egw_exception_wrong_parameter(__METHOD__."('$file') not found or readable!"); } if (!check_load_extension('pdo') || !check_load_extension('pdo_sqlite')) { throw new egw_exception_assertion_failed(__METHOD__."('$file') required SQLite support (PHP extension pdo_sqlite) missing!"); } $pdo = new PDO('sqlite:'.$path); // some PHP pdo_sqlite can for whatever reason NOT read the timezones database (reported eg. on Gentu) // not much we can do, but give an good error message, with a download link to the MySQL dump if (!($rs = $pdo->query('SELECT version FROM tz_schema_version'))) { throw new egw_exception_wrong_userinput( lang('Your PHP extension pdo_sqlite is broken!').'
'.lang('It can NOT read timezones from sqlite database %1!',$path).'
'. lang('As an alternative you can %1download a MySQL dump%2 and import it manually into egw_cal_timezones table.', '','')); } if ($rs->fetchColumn() != 1) { throw new egw_exception_wrong_parameter(__METHOD__."('$file') only schema version 1 supported!"); } $tz_version = $pdo->query('SELECT version FROM tz_version')->fetchColumn(); $tz_db_version = $GLOBALS['egw']->db->query("SELECT config_value FROM egw_config WHERE config_name='tz_version' AND config_app='phpgwapi'",__LINE__,__FILE__)->fetchColumn(); //echo "

tz_version($path)=$tz_version, tz_db_version=$tz_db_version

\n"; if ($tz_version === $tz_db_version) { $updated = false; return lang('Nothing to update, version is already %1.',$tz_db_version); // we already have the right } $tz2id = array(); foreach($pdo->query('SELECT * FROM tz_data ORDER BY alias') as $data) { if ($data['alias']) { $data['alias'] = $tz2id[$data['alias']]; if (!$data['alias']) continue; // there's no such tzid } // check if already in database $tz2id[$data['tzid']] = $GLOBALS['egw']->db->select('egw_cal_timezones','tz_id',array( 'tz_tzid' => $data['tzid'], ),__LINE__,__FILE__,false,'','calendar')->fetchColumn(); $GLOBALS['egw']->db->insert('egw_cal_timezones',array( 'tz_alias' => $data['alias'], 'tz_latitude' => $data['latitude'], 'tz_longitude' => $data['longitude'], 'tz_component' => $data['component'], ),array( 'tz_tzid' => $data['tzid'], ),__LINE__,__FILE__,'calendar'); // only query last insert id, if not already in database (gives warning for PostgreSQL) if (!$tz2id[$data['tzid']]) $tz2id[$data['tzid']] = $GLOBALS['egw']->db->get_last_insert_id('egw_cal_timezones','tz_id'); } $GLOBALS['egw']->db->insert('egw_config',array('config_value' => $tz_version),array( 'config_name' => 'tz_version', 'config_app' => 'phpgwapi', ),__LINE__,__FILE__,'phpgwapi'); //_debug_array($tz2id); $updated = true; return lang('Timezones updated to version %1 (%2 records updated).',$tz_version,count($tz2id)); } /** * Admin >> Update timezones * */ public function update() { if (!$GLOBALS['egw_info']['user']['apps']['admin']) { throw new egw_exception_no_permission_admin(); } $GLOBALS['egw']->framework->render('

'.self::import_sqlite()."

\n",lang('Update timezones'),true); } } /* if (isset($_SERVER['SCRIPT_FILENAME']) && $_SERVER['SCRIPT_FILENAME'] == __FILE__) // some tests { $GLOBALS['egw_info'] = array( 'flags' => array( 'currentapp' => 'calendar', ) ); include('../../header.inc.php'); calendar_timezones::init_static(); // echo "

Testing availability of VTIMEZONE data for each tzid supported by PHP

\n"; // foreach(DateTimeZone::listIdentifiers() as $tz) echo "

Testing availability of VTIMEZONE data for each TZID supported by EGroupware

\n"; foreach(call_user_func_array('array_merge',egw_time::getTimezones()) as $tz => $label) { if (($id = calendar_timezones::tz2id($tz,'component')) || $tz == 'UTC') // UTC is always supported { $found[] = $tz; //if (substr($tz,0,10) == 'Australia/') echo "$tz: found
\n"; } else { $not_found[] = $tz; echo "$tz: NOT found
\n"; } } echo '

'.count($found).' found, '.count($not_found)." NOT found

\n"; if ($not_found) echo "
\n\$no_vtimezone = array(\n\t'".implode("',\n\t'",$not_found)."',\n);\n
\n"; echo "

Testing availability of PHP support for each TZID supported by EGroupware's timezone database:

\n"; foreach($GLOBALS['egw']->db->select('egw_cal_timezones','*',false,__LINE__,__FILE__,false,'','calendar') as $row) { try { $timezone = new DateTimeZone($row['tz_tzid']); //$timezone = calendar_timezones::DateTimeZone($row['tz_tzid']); echo $row['tz_tzid'].": available
\n"; } catch(Exception $e) { if (($id = calendar_timezones::tz2id($row['tz_tzid'],'alias')) && ($alias = calendar_timezones::id2tz($id))) { try { $timezone = new DateTimeZone($alias); echo $row['tz_tzid']."='$alias': available through alias
\n"; unset($e); } catch(Exception $e) { // ignore } } if (isset($e)) echo $row['tz_tzid'].": NOT available
\n"; } } } else*/ calendar_timezones::init_static();