/**
* {@inheritdoc}
*/
public function __invoke(ServerRequestInterface $request, ResponseInterface $response, WatcherInterface $watcher)
{
if ($watcher instanceof ScheduledWatcherInterface) {
$response = $response->withHeader('Expires', $watcher->getEnd()->format('D, d M Y H:i:s e'));
} else {
$response = $response->withHeader('Cache-Control', 'max-age=0')->withHeader('Cache-Control', 'no-cache, must-revalidate')->withHeader('Pragma', 'no-cache');
}
$location = $this->location;
if (!preg_match('/^https?:\\/\\//', $location)) {
$location = (string) $request->getUri()->withPath($location);
}
return $response->withStatus(302)->withHeader('Location', $location);
}
/**
* Retrieve custom maintenance message.
*
* @param WatcherInterface $watcher
*
* @return string
*/
protected function getMaintenanceMessage(WatcherInterface $watcher)
{
$message = 'Maintenance mode is not active!';
if ($watcher->isActive()) {
$message = $watcher instanceof ScheduledWatcherInterface ? 'Undergoing maintenance tasks until ' . $watcher->getEnd()->format('Y/m/d H:i:s') : 'Undergoing maintenance tasks';
}
return $message;
}