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<?php
/**
* SPDX-FileCopyrightText: 2016-2024 Nextcloud GmbH and Nextcloud contributors
* SPDX-FileCopyrightText: 2016 ownCloud, Inc.
* SPDX-License-Identifier: AGPL-3.0-only
*/
namespace OC;
use OCP\IConfig;
use OCP\IDateTimeZone;
use OCP\ISession;
use Psr\Log\LoggerInterface;
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 $e) {
\OC::$server->get(LoggerInterface::class)->debug('Failed to created DateTimeZone "' . $timeZone . '"', ['app' => 'datetimezone']);
return new \DateTimeZone($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 $dtz;
}
}
// No timezone found, fallback to UTC
\OC::$server->get(LoggerInterface::class)->debug('Failed to find DateTimeZone for offset "' . $offset . '"', ['app' => 'datetimezone']);
return new \DateTimeZone($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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