/**
* @param string $backendId
* @param string $privateUri
* @param string $userId
* @param ICalendar $usersCalendar
* @return mixed
*/
public function scanCalendar($backendId, $privateUri, $userId, ICalendar &$usersCalendar = null)
{
$backend = $this->backends->find($backendId);
if (!$backend instanceof IBackend) {
$this->logger->debug('Backend \'' . $backendId . '\' not found');
return null;
}
$calendar = $this->getRemoteAndDeleteIfNecessary($backend, $privateUri, $userId);
if (!$calendar) {
return null;
}
$cachedCalendar = $this->getCached($backendId, $privateUri, $userId);
if ($cachedCalendar) {
if ($usersCalendar) {
$calendar = $this->resetUnsupportedProperties($backend, $calendar, $usersCalendar);
} else {
$calendar = $this->resetUnsupportedProperties($backend, $calendar, $cachedCalendar);
}
$cachedCalendar->overwriteWith($calendar);
$this->updateCache($cachedCalendar);
} else {
CalendarUtility::generateURI($calendar, function ($newUri) use($calendar) {
return $this->cache->doesExist($newUri, $calendar->getUserId());
}, true);
$calendar = $this->addToCache($calendar);
if ($usersCalendar) {
$usersCalendar->setId($calendar->getId());
}
}
}
/**
* @param ICalendar $n
* @param ICalendar $o
* @throws Exception
*/
private function checkForIllegalChanges(ICalendar $n, ICalendar $o)
{
if ($n->getUserId() !== $o->getUserId()) {
throw new Exception('Not allowed to transfer calendar to another user!');
}
if ($n->getBackend()->getId() !== $o->getBackend()->getId()) {
throw new Exception('Not allowed to transfer calendar to another backend!');
}
if ($n->getPublicUri() !== $o->getPublicUri()) {
if ($this->cache->doesExist($n->getPublicUri(), $n->getUserId())) {
throw new Exception('New URI is already assigned to another calendar!');
}
}
}
