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266 lines
9.4 KiB
266 lines
9.4 KiB
10 years ago
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<?php
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namespace Sabre\VObject;
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/**
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* Time zone name translation
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*
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* This file translates well-known time zone names into "Olson database" time zone names.
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*
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* @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
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* @author Frank Edelhaeuser (fedel@users.sourceforge.net)
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* @author Evert Pot (http://evertpot.com/)
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* @license http://sabre.io/license/ Modified BSD License
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*/
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class TimeZoneUtil {
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public static $map = null;
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/**
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* List of microsoft exchange timezone ids.
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*
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* Source: http://msdn.microsoft.com/en-us/library/aa563018(loband).aspx
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*/
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public static $microsoftExchangeMap = array(
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0 => 'UTC',
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31 => 'Africa/Casablanca',
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// Insanely, id #2 is used for both Europe/Lisbon, and Europe/Sarajevo.
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// I'm not even kidding.. We handle this special case in the
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// getTimeZone method.
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2 => 'Europe/Lisbon',
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1 => 'Europe/London',
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4 => 'Europe/Berlin',
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6 => 'Europe/Prague',
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3 => 'Europe/Paris',
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69 => 'Africa/Luanda', // This was a best guess
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7 => 'Europe/Athens',
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5 => 'Europe/Bucharest',
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49 => 'Africa/Cairo',
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50 => 'Africa/Harare',
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59 => 'Europe/Helsinki',
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27 => 'Asia/Jerusalem',
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26 => 'Asia/Baghdad',
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74 => 'Asia/Kuwait',
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51 => 'Europe/Moscow',
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56 => 'Africa/Nairobi',
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25 => 'Asia/Tehran',
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24 => 'Asia/Muscat', // Best guess
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54 => 'Asia/Baku',
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48 => 'Asia/Kabul',
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58 => 'Asia/Yekaterinburg',
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47 => 'Asia/Karachi',
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23 => 'Asia/Calcutta',
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62 => 'Asia/Kathmandu',
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46 => 'Asia/Almaty',
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71 => 'Asia/Dhaka',
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66 => 'Asia/Colombo',
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61 => 'Asia/Rangoon',
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22 => 'Asia/Bangkok',
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64 => 'Asia/Krasnoyarsk',
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45 => 'Asia/Shanghai',
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63 => 'Asia/Irkutsk',
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21 => 'Asia/Singapore',
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73 => 'Australia/Perth',
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75 => 'Asia/Taipei',
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20 => 'Asia/Tokyo',
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72 => 'Asia/Seoul',
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70 => 'Asia/Yakutsk',
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19 => 'Australia/Adelaide',
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44 => 'Australia/Darwin',
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18 => 'Australia/Brisbane',
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76 => 'Australia/Sydney',
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43 => 'Pacific/Guam',
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42 => 'Australia/Hobart',
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68 => 'Asia/Vladivostok',
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41 => 'Asia/Magadan',
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17 => 'Pacific/Auckland',
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40 => 'Pacific/Fiji',
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67 => 'Pacific/Tongatapu',
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29 => 'Atlantic/Azores',
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53 => 'Atlantic/Cape_Verde',
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30 => 'America/Noronha',
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8 => 'America/Sao_Paulo', // Best guess
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32 => 'America/Argentina/Buenos_Aires',
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60 => 'America/Godthab',
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28 => 'America/St_Johns',
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9 => 'America/Halifax',
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33 => 'America/Caracas',
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65 => 'America/Santiago',
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35 => 'America/Bogota',
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10 => 'America/New_York',
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34 => 'America/Indiana/Indianapolis',
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55 => 'America/Guatemala',
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11 => 'America/Chicago',
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37 => 'America/Mexico_City',
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36 => 'America/Edmonton',
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38 => 'America/Phoenix',
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12 => 'America/Denver', // Best guess
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13 => 'America/Los_Angeles', // Best guess
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14 => 'America/Anchorage',
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15 => 'Pacific/Honolulu',
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16 => 'Pacific/Midway',
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39 => 'Pacific/Kwajalein',
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);
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/**
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* This method will try to find out the correct timezone for an iCalendar
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* date-time value.
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*
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* You must pass the contents of the TZID parameter, as well as the full
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* calendar.
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*
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* If the lookup fails, this method will return the default PHP timezone
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* (as configured using date_default_timezone_set, or the date.timezone ini
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* setting).
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*
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* Alternatively, if $failIfUncertain is set to true, it will throw an
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* exception if we cannot accurately determine the timezone.
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*
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* @param string $tzid
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* @param Sabre\VObject\Component $vcalendar
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* @return DateTimeZone
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*/
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static public function getTimeZone($tzid, Component $vcalendar = null, $failIfUncertain = false) {
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// First we will just see if the tzid is a support timezone identifier.
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//
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// The only exception is if the timezone starts with (. This is to
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// handle cases where certain microsoft products generate timezone
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// identifiers that for instance look like:
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//
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// (GMT+01.00) Sarajevo/Warsaw/Zagreb
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//
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// Since PHP 5.5.10, the first bit will be used as the timezone and
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// this method will return just GMT+01:00. This is wrong, because it
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// doesn't take DST into account.
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if ($tzid[0]!=='(') {
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// PHP has a bug that logs PHP warnings even it shouldn't:
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// https://bugs.php.net/bug.php?id=67881
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//
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// That's why we're checking if we'll be able to successfull instantiate
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// \DateTimeZone() before doing so. Otherwise we could simply instantiate
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// and catch the exception.
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$tzIdentifiers = \DateTimeZone::listIdentifiers();
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try {
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if (
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(in_array($tzid, $tzIdentifiers)) ||
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(preg_match('/^GMT(\+|-)([0-9]{4})$/', $tzid, $matches)) ||
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(in_array($tzid, self::getIdentifiersBC()))
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) {
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return new \DateTimeZone($tzid);
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}
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} catch(\Exception $e) {
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}
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}
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self::loadTzMaps();
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// Next, we check if the tzid is somewhere in our tzid map.
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if (isset(self::$map[$tzid])) {
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return new \DateTimeZone(self::$map[$tzid]);
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}
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// Maybe the author was hyper-lazy and just included an offset. We
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// support it, but we aren't happy about it.
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if (preg_match('/^GMT(\+|-)([0-9]{4})$/', $tzid, $matches)) {
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// Note that the path in the source will never be taken from PHP 5.5.10
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// onwards. PHP 5.5.10 supports the "GMT+0100" style of format, so it
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// already gets returned early in this function. Once we drop support
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// for versions under PHP 5.5.10, this bit can be taken out of the
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// source.
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// @codeCoverageIgnoreStart
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return new \DateTimeZone('Etc/GMT' . $matches[1] . ltrim(substr($matches[2],0,2),'0'));
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// @codeCoverageIgnoreEnd
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}
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if ($vcalendar) {
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// If that didn't work, we will scan VTIMEZONE objects
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foreach($vcalendar->select('VTIMEZONE') as $vtimezone) {
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if ((string)$vtimezone->TZID === $tzid) {
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// Some clients add 'X-LIC-LOCATION' with the olson name.
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if (isset($vtimezone->{'X-LIC-LOCATION'})) {
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$lic = (string)$vtimezone->{'X-LIC-LOCATION'};
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// Libical generators may specify strings like
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// "SystemV/EST5EDT". For those we must remove the
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// SystemV part.
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if (substr($lic,0,8)==='SystemV/') {
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$lic = substr($lic,8);
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}
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return self::getTimeZone($lic, null, $failIfUncertain);
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}
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// Microsoft may add a magic number, which we also have an
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// answer for.
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if (isset($vtimezone->{'X-MICROSOFT-CDO-TZID'})) {
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$cdoId = (int)$vtimezone->{'X-MICROSOFT-CDO-TZID'}->getValue();
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// 2 can mean both Europe/Lisbon and Europe/Sarajevo.
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if ($cdoId===2 && strpos((string)$vtimezone->TZID, 'Sarajevo')!==false) {
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return new \DateTimeZone('Europe/Sarajevo');
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}
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if (isset(self::$microsoftExchangeMap[$cdoId])) {
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return new \DateTimeZone(self::$microsoftExchangeMap[$cdoId]);
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}
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}
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}
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}
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}
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if ($failIfUncertain) {
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throw new \InvalidArgumentException('We were unable to determine the correct PHP timezone for tzid: ' . $tzid);
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}
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// If we got all the way here, we default to UTC.
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return new \DateTimeZone(date_default_timezone_get());
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}
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/**
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* This method will load in all the tz mapping information, if it's not yet
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* done.
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*/
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static public function loadTzMaps() {
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if (!is_null(self::$map)) return;
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self::$map = array_merge(
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include __DIR__ . '/timezonedata/windowszones.php',
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include __DIR__ . '/timezonedata/lotuszones.php',
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include __DIR__ . '/timezonedata/exchangezones.php',
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include __DIR__ . '/timezonedata/php-workaround.php'
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);
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}
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/**
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* This method returns an array of timezone identifiers, that are supported
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* by DateTimeZone(), but not returned by DateTimeZone::listIdentifiers()
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*
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* We're not using DateTimeZone::listIdentifiers(DateTimeZone::ALL_WITH_BC) because:
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* - It's not supported by some PHP versions as well as HHVM.
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* - It also returns identifiers, that are invalid values for new DateTimeZone() on some PHP versions.
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* (See timezonedata/php-bc.php and timezonedata php-workaround.php)
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*
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* @return array
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*/
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static public function getIdentifiersBC() {
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return include __DIR__ . '/timezonedata/php-bc.php';
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}
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}
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