109 lines
2.8 KiB
PHP
109 lines
2.8 KiB
PHP
<?php
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/**
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* ownCloud
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*
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* @author Joas Schilling
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* @copyright 2014 Joas Schilling nickvergessen@owncloud.com
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*
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* This file is licensed under the Affero General Public License version 3 or
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* later.
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* See the COPYING-README file.
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*/
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namespace OC;
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use OCP\IConfig;
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use OCP\IDateTimeZone;
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use OCP\ISession;
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class DateTimeZone implements IDateTimeZone {
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/** @var IConfig */
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protected $config;
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/** @var ISession */
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protected $session;
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/**
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* Constructor
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*
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* @param IConfig $config
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* @param ISession $session
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*/
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public function __construct(IConfig $config, ISession $session) {
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$this->config = $config;
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$this->session = $session;
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}
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/**
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* Get the timezone of the current user, based on his session information and config data
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*
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* @return \DateTimeZone
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*/
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public function getTimeZone() {
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$timeZone = $this->config->getUserValue($this->session->get('user_id'), 'core', 'timezone', null);
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if ($timeZone === null) {
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if ($this->session->exists('timezone')) {
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return $this->guessTimeZoneFromOffset($this->session->get('timezone'));
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}
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$timeZone = $this->getDefaultTimeZone();
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}
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try {
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return new \DateTimeZone($timeZone);
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} catch (\Exception $e) {
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\OCP\Util::writeLog('datetimezone', 'Failed to created DateTimeZone "' . $timeZone . "'", \OCP\Util::DEBUG);
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return new \DateTimeZone($this->getDefaultTimeZone());
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}
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}
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/**
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* Guess the DateTimeZone for a given offset
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*
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* We first try to find a Etc/GMT* timezone, if that does not exist,
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* we try to find it manually, before falling back to UTC.
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*
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* @param mixed $offset
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* @return \DateTimeZone
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*/
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protected function guessTimeZoneFromOffset($offset) {
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try {
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// Note: the timeZone name is the inverse to the offset,
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// so a positive offset means negative timeZone
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// and the other way around.
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if ($offset > 0) {
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$timeZone = 'Etc/GMT-' . $offset;
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} else {
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$timeZone = 'Etc/GMT+' . abs($offset);
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}
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return new \DateTimeZone($timeZone);
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} catch (\Exception $e) {
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// If the offset has no Etc/GMT* timezone,
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// we try to guess one timezone that has the same offset
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foreach (\DateTimeZone::listIdentifiers() as $timeZone) {
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$dtz = new \DateTimeZone($timeZone);
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$dtOffset = $dtz->getOffset(new \DateTime());
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if ($dtOffset == 3600 * $offset) {
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return $dtz;
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}
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}
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// No timezone found, fallback to UTC
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\OCP\Util::writeLog('datetimezone', 'Failed to find DateTimeZone for offset "' . $offset . "'", \OCP\Util::DEBUG);
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return new \DateTimeZone($this->getDefaultTimeZone());
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}
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}
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/**
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* Get the default timezone of the server
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*
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* Falls back to UTC if it is not yet set.
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*
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* @return string
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*/
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protected function getDefaultTimeZone() {
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$serverTimeZone = date_default_timezone_get();
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return $serverTimeZone ?: 'UTC';
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}
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}
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