public function updateDocument(Document $document, $title, $plainContent, User $updater, $passPhrase)
{
$share = $document->getShareOf($updater);
if ($share === null) {
throw new AccessDeniedException('The user does not have access to this document');
}
$encryptionKey = $this->getEncryptionKey($share, $passPhrase);
$encryptedContent = base64_encode(\Crypto::Encrypt($plainContent, $encryptionKey));
$document->setTitle($title);
$document->setEncryptedContent($encryptedContent);
$this->documentRepository->save($document);
}