Checks that the path is inside the jail and throws an exception if not.
string $path: A path to check against the jail.
Drupal\Core\FileTransfer\FileTransferException
protected final function checkPath($path) {
$full_jail = $this->chroot . $this->jail;
$full_path = drupal_realpath(substr($this->chroot . $path, 0, strlen($full_jail)));
$full_path = $this
->fixRemotePath($full_path, FALSE);
if ($full_jail !== $full_path) {
throw new FileTransferException('@directory is outside of the @jail', NULL, array(
'@directory' => $path,
'@jail' => $this->jail,
));
}
}