/**
* walk over any calendars that are not fully scanned yet and scan them
*/
protected function backgroundScan()
{
$scanned = [];
while (($calendar = $this->cache->getIncomplete()) !== false && !in_array($calendar->getId(), $scanned)) {
$this->scanCalendar($calendar->getBackend()->getId(), $calendar->getPrivateUri(), $calendar->getUserId());
$scanned[] = $calendar->getId();
}
}
/**
* was a calendar updated?
* @param string $backendId
* @param string $privateUri
* @param string $userId
* @return boolean
*/
public function checkUpdate($backendId, $privateUri, $userId)
{
if ($this->watchPolicy === self::CHECK_ALWAYS || $this->watchPolicy === self::CHECK_ONCE && !$this->wasCalendarChecked($backendId, $privateUri, $userId)) {
$backend = $this->backends->find($backendId);
if (!$backend instanceof IBackend) {
return false;
}
$cachedCalendar = $this->cache->findByPrivateUri($backendId, $privateUri, $userId);
$this->setCheckedCalendar($backendId, $privateUri, $userId);
$calendarAPI = $backend->getCalendarAPI();
if ($calendarAPI->hasUpdated($cachedCalendar)) {
$objectScanner = $backend->getObjectScanner($cachedCalendar);
$objectScanner->scan();
$this->scanner->scanCalendar($backendId, $privateUri, $userId);
return true;
}
return false;
} else {
return false;
}
}
/**
* @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!');
}
}
}
