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egroupware_official/calendar/inc/class.calendar_timezones.inc.php

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<?php
/**
* EGroupware - Calendar's timezone information
*
* Timezone information get imported from SQLite database, "borrowed" of Lighting TB extension.
*
* @link http://www.egroupware.org
* @package calendar
* @author Ralf Becker <RalfBecker-AT-outdoor-training.de>
* @copyright (c) 2009-11 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 $tzid
* @return DateTimeZone
* @throws Exception if called with an unknown TZID
*/
public static function DateTimeZone($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
$msg = self::import_tz_aliases($updated);
if ($updated) error_log($msg); // log that timezone aliases 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 = $pdo->query('SELECT version FROM tz_schema_version')))
{
throw new egw_exception_wrong_userinput(
lang('Your PHP extension pdo_sqlite is broken!').'<br />'.lang('It can NOT read timezones from sqlite database %1!',$path).'<br />'.
lang('As an alternative you can %1download a MySQL dump%2 and import it manually into egw_cal_timezones table.',
'<a href="http://dev.egroupware.org/other/egw_cal_timezones.sql.bz2">','</a>'));
}
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();
$config = config::read('phpgwapi');
//echo "<p>tz_version($path)=$tz_version, tz_db_version=$config[tz_version]</p>\n";
if ($tz_version === $config['tz_version'])
{
$updated = false;
return lang('Nothing to update, version is already %1.',$config['tz_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');
}
config::save_value('tz_version', $tz_version, 'phpgwapi');
//_debug_array($tz2id);
$updated = true;
return lang('Timezones updated to version %1 (%2 records updated).',$tz_version,count($tz2id));
}
/**
* Import timezone aliases
*
* @param boolean &$updated=null on return true if update was neccessary, false if tz's were already up to date
* @param string $file='calendar/setup/tz_aliases.inc.php' filename relative to EGW_SERVER_ROOT
* @param boolean $check_mtime=true true: check version and only act, if it's different
* @return string message about update
* @throws egw_exception_wrong_parameter if $file is not readable or wrong format/version
*/
public static function import_tz_aliases(&$updated=null,$file='calendar/setup/tz_aliases.inc.php',$check_mtime=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!");
}
$config = config::read('phpgwapi');
$tz_aliases_mtime = date('Y-m-d H:i:s', filemtime($path));
if ($tz_aliases_mtime === $config['tz_aliases_mtime'])
{
$updated = false;
return lang('Nothing to update, version is already %1.',$tz_aliases_mtime);
}
include($path); // sets $tz_aliases
$updates = 0;
foreach($tz_aliases as $alias => $tzid)
{
if ((!($alias_id=self::tz2id($alias, 'alias')) || self::id2tz($alias_id, 'tzid') !== $tzid) && // not in DB or different
($tz_id = self::tz2id($tzid))) // given tzid for alias exists in DB
{
$GLOBALS['egw']->db->insert('egw_cal_timezones',array(
'tz_alias' => $tz_id,
),array(
'tz_tzid' => $alias,
),__LINE__,__FILE__,'calendar');
++$updates;
}
//error_log(__METHOD__."() alias=$alias, tzid=$tzid --> self::tz2id('$alias', 'alias') = ".array2string($alias_id).", self::tz2id('$tzid')=".array2string($tz_id));
}
config::save_value('tz_aliases_mtime',$tz_aliases_mtime,$app='phpgwapi');
//_debug_array($tz2id);
$updated = true;
return lang('Timezones aliases updated to version %1 (%2 records updated).', $tz_aliases_mtime, $updates);
}
/**
* Admin >> Update timezones
*
*/
public function update()
{
if (!$GLOBALS['egw_info']['user']['apps']['admin'])
{
throw new egw_exception_no_permission_admin();
}
$GLOBALS['egw']->framework->render(
'<h3>'.self::import_sqlite()."</h3>\n".
'<h3>'.self::import_tz_aliases()."</h3>\n",
lang('Update timezones'),true);
}
/**
* Add VTIMEZONE component to VCALENDAR
*
* @param Horde_iCalendar $vcal
* @param string $tzid
* @return boolean false if no vtimezone component available, true on success
*/
public static function add_vtimezone($vcal, $tzid)
{
include_once EGW_SERVER_ROOT.'/phpgwapi/inc/horde/lib/core.php';
// checking type of $val, now we included the object definition (no need to always include it!)
if (!$vcal instanceof Horde_iCalendar)
{
throw new egw_exception_wrong_parameter(__METHOD__.'('.array2string($val).", '$tzid') no Horde_iCalendar!");
}
// check if we have vtimezone component data for $tzid
if (!($vtimezone = calendar_timezones::tz2id($tzid, 'component')))
{
return false;
}
// $vtimezone is a string with a single VTIMEZONE component, afaik Horde_iCalendar can not add it directly
// --> we have to parse it and let Horde_iCalendar add it again
$horde_vtimezone = Horde_iCalendar::newComponent('VTIMEZONE',$container=false);
$horde_vtimezone->parsevCalendar($vtimezone,'VTIMEZONE');
// DTSTART is in UTC time, Horde_iCalendar parses it in server timezone, which we need to set again for printing
$standard = $horde_vtimezone->findComponent('STANDARD');
if (is_a($standard, 'Horde_iCalendar'))
{
$dtstart = $standard->getAttribute('DTSTART');
$dtstart = new egw_time($dtstart, egw_time::$server_timezone);
$dtstart->setTimezone(egw_time::$server_timezone);
$standard->setAttribute('DTSTART', $dtstart->format('Ymd\THis'), array(), false);
}
$daylight = $horde_vtimezone->findComponent('DAYLIGHT');
if (is_a($daylight, 'Horde_iCalendar'))
{
$dtstart = $daylight->getAttribute('DTSTART');
$dtstart = new egw_time($dtstart, egw_time::$server_timezone);
$dtstart->setTimezone(egw_time::$server_timezone);
$daylight->setAttribute('DTSTART', $dtstart->format('Ymd\THis'), array(), false);
}
//error_log($vtimezone); error_log($horde_vtimezone->_exportvData('VTIMEZONE'));
$vcal->addComponent($horde_vtimezone);
return true;
}
/**
* Query timezone of a given user, returns 'tzid' or VTIMEZONE 'component'
*
* @param int $user=null
* @param string $type='vcalendar' 'tzid' or everything tz2id supports, default 'vcalendar' = full vcalendar component
* @return string
*/
public static function user_timezone($user=null, $type='vcalendar')
{
if (!$user || $user == $GLOBALS['egw_info']['user']['account_id'])
{
$tzid = $GLOBALS['egw_info']['user']['preferences']['common']['tz'];
}
else
{
$prefs_obj = new preferences($user);
$prefs = $prefs_obj->read();
$tzid = $prefs['common']['tz'];
}
if (!$tzid) $tzid = egw_time::$server_timezone->getName();
switch ($type)
{
case 'vcalendar':
include_once EGW_SERVER_ROOT.'/phpgwapi/inc/horde/lib/core.php';
// checking type of $val, now we included the object definition (no need to always include it!)
$vcal = new Horde_iCalendar;
$vcal->setAttribute('PRODID','-//EGroupware//NONSGML EGroupware Calendar '.$GLOBALS['egw_info']['apps']['calendar']['version'].'//'.
strtoupper($GLOBALS['egw_info']['user']['preferences']['common']['lang']));
self::add_vtimezone($vcal, $tzid);
$tzid = $vcal->exportvCalendar('utf-8');
break;
case 'tzid':
break;
default:
$tzid = self::tz2id($tzid,$type == 'vcalendar' ? 'component' : $type);
break;
}
return $tzid;
}
}
/*
if (isset($_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 "<h3>Testing availability of VTIMEZONE data for each tzid supported by PHP</h3>\n";
// foreach(DateTimeZone::listIdentifiers() as $tz)
echo "<h3>Testing availability of VTIMEZONE data for each TZID supported by EGroupware</h3>\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<br />\n";
}
else
{
$not_found[] = $tz;
echo "$tz: <b>NOT</b> found<br />\n";
}
}
echo '<h3>'.count($found).' found, '.count($not_found)." <b>NOT</b> found</h3>\n";
if ($not_found) echo "<pre>\n\$no_vtimezone = array(\n\t'".implode("',\n\t'",$not_found)."',\n);\n</pre>\n";
echo "<h3>Testing availability of PHP support for each TZID supported by EGroupware's timezone database:</h3>\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<br />\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 <b>alias</b><br />\n";
unset($e);
}
catch(Exception $e)
{
// ignore
}
}
if (isset($e)) echo $row['tz_tzid'].": <b>NOT</b> available<br />\n";
}
}
}
else*/
calendar_timezones::init_static();
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