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- <?php
- /**
- * @copyright Copyright (c) 2016, ownCloud, Inc.
- *
- * @author Joas Schilling <coding@schilljs.com>
- * @author Morris Jobke <hey@morrisjobke.de>
- *
- * @license AGPL-3.0
- *
- * This code is free software: you can redistribute it and/or modify
- * it under the terms of the GNU Affero General Public License, version 3,
- * as published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU Affero General Public License for more details.
- *
- * You should have received a copy of the GNU Affero General Public License, version 3,
- * along with this program. If not, see <http://www.gnu.org/licenses/>
- *
- */
- namespace OC;
- use OCP\IConfig;
- use OCP\IDateTimeZone;
- use OCP\ISession;
- class DateTimeZone implements IDateTimeZone {
- /** @var IConfig */
- protected $config;
- /** @var ISession */
- protected $session;
- /**
- * Constructor
- *
- * @param IConfig $config
- * @param ISession $session
- */
- public function __construct(IConfig $config, ISession $session) {
- $this->config = $config;
- $this->session = $session;
- }
- /**
- * Get the timezone of the current user, based on his session information and config data
- *
- * @param bool|int $timestamp
- * @return \DateTimeZone
- */
- public function getTimeZone($timestamp = false) {
- $timeZone = $this->config->getUserValue($this->session->get('user_id'), 'core', 'timezone', null);
- if ($timeZone === null) {
- if ($this->session->exists('timezone')) {
- return $this->guessTimeZoneFromOffset($this->session->get('timezone'), $timestamp);
- }
- $timeZone = $this->getDefaultTimeZone();
- }
- try {
- return new \DateTimeZone($timeZone);
- } catch (\Exception $e) {
- \OCP\Util::writeLog('datetimezone', 'Failed to created DateTimeZone "' . $timeZone . "'", \OCP\Util::DEBUG);
- return new \DateTimeZone($this->getDefaultTimeZone());
- }
- }
- /**
- * Guess the DateTimeZone for a given offset
- *
- * We first try to find a Etc/GMT* timezone, if that does not exist,
- * we try to find it manually, before falling back to UTC.
- *
- * @param mixed $offset
- * @param bool|int $timestamp
- * @return \DateTimeZone
- */
- protected function guessTimeZoneFromOffset($offset, $timestamp) {
- try {
- // Note: the timeZone name is the inverse to the offset,
- // so a positive offset means negative timeZone
- // and the other way around.
- if ($offset > 0) {
- $timeZone = 'Etc/GMT-' . $offset;
- } else {
- $timeZone = 'Etc/GMT+' . abs($offset);
- }
- return new \DateTimeZone($timeZone);
- } catch (\Exception $e) {
- // If the offset has no Etc/GMT* timezone,
- // we try to guess one timezone that has the same offset
- foreach (\DateTimeZone::listIdentifiers() as $timeZone) {
- $dtz = new \DateTimeZone($timeZone);
- $dateTime = new \DateTime();
- if ($timestamp !== false) {
- $dateTime->setTimestamp($timestamp);
- }
- $dtOffset = $dtz->getOffset($dateTime);
- if ($dtOffset == 3600 * $offset) {
- return $dtz;
- }
- }
- // No timezone found, fallback to UTC
- \OCP\Util::writeLog('datetimezone', 'Failed to find DateTimeZone for offset "' . $offset . "'", \OCP\Util::DEBUG);
- return new \DateTimeZone($this->getDefaultTimeZone());
- }
- }
- /**
- * Get the default timezone of the server
- *
- * Falls back to UTC if it is not yet set.
- *
- * @return string
- */
- protected function getDefaultTimeZone() {
- $serverTimeZone = date_default_timezone_get();
- return $serverTimeZone ?: 'UTC';
- }
- }
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