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<?php
/**
* @copyright Copyright (c) 2017 Joas Schilling <coding@schilljs.com>
*
* @license GNU AGPL version 3 or any later version
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
namespace OCA\Notifications;
use OC\Authentication\Exceptions\InvalidTokenException;
use OC\Authentication\Token\IProvider;
use OC\Security\IdentityProof\Key;
use OC\Security\IdentityProof\Manager;
use OCP\AppFramework\Http;
use OCP\DB\QueryBuilder\IQueryBuilder;
use OCP\Http\Client\IClientService;
use OCP\IConfig;
use OCP\IDBConnection;
use OCP\ILogger;
use OCP\IUser;
use OCP\IUserManager;
use OCP\Notification\IManager as INotificationManager;
use OCP\Notification\INotification;
class Push {
/** @var IDBConnection */
protected $db;
/** @var INotificationManager */
protected $notificationManager;
/** @var IConfig */
protected $config;
/** @var IProvider */
protected $tokenProvider;
/** @var Manager */
private $keyManager;
/** @var IUserManager */
private $userManager;
/** @var IClientService */
protected $clientService;
/** @var ILogger */
protected $log;
public function __construct(IDBConnection $connection, INotificationManager $notificationManager, IConfig $config, IProvider $tokenProvider, Manager $keyManager, IUserManager $userManager, IClientService $clientService, ILogger $log) {
$this->db = $connection;
$this->notificationManager = $notificationManager;
$this->config = $config;
$this->tokenProvider = $tokenProvider;
$this->keyManager = $keyManager;
$this->userManager = $userManager;
$this->clientService = $clientService;
$this->log = $log;
}
/**
* @param INotification $notification
*/
public function pushToDevice(INotification $notification) {
$user = $this->userManager->get($notification->getUser());
if (!($user instanceof IUser)) {
return;
}
$devices = $this->getDevicesForUser($notification->getUser());
if (empty($devices)) {
return;
}
$language = $this->config->getUserValue($notification->getUser(), 'core', 'lang', 'en');
try {
$notification = $this->notificationManager->prepare($notification, $language);
} catch (\InvalidArgumentException $e) {
return;
}
$userKey = $this->keyManager->getKey($user);
$pushNotifications = [];
foreach ($devices as $device) {
try {
$payload = json_encode($this->encryptAndSign($userKey, $device, $notification));
$proxyServer = rtrim($device['proxyserver'], '/');
if (!isset($pushNotifications[$proxyServer])) {
$pushNotifications[$proxyServer] = [];
}
$pushNotifications[$proxyServer][] = $payload;
} catch (InvalidTokenException $e) {
// Token does not exist anymore, should drop the push device entry
$this->deletePushToken($device['token']);
} catch (\InvalidArgumentException $e) {
// Failed to encrypt message for device: public key is invalid
$this->deletePushToken($device['token']);
}
}
if (empty($pushNotifications)) {
return;
}
$client = $this->clientService->newClient();
foreach ($pushNotifications as $proxyServer => $notifications) {
try {
$response = $client->post($proxyServer . '/notifications', [
'body' => [
'notifications' => $notifications,
],
]);
} catch (\Exception $e) {
$this->log->logException($e, [
'app' => 'notifications',
]);
continue;
}
$status = $response->getStatusCode();
if ($status !== Http::STATUS_OK && $status !== Http::STATUS_SERVICE_UNAVAILABLE) {
$body = $response->getBody();
$this->log->error('Could not send notification to push server [{url}]: {error}',[
'error' => is_string($body) ? $body : 'no reason given',
'url' => $proxyServer,
'app' => 'notifications',
]);
} else if ($status === Http::STATUS_SERVICE_UNAVAILABLE && $this->config->getSystemValue('debug', false)) {
$body = $response->getBody();
$this->log->debug('Could not send notification to push server [{url}]: {error}',[
'error' => is_string($body) ? $body : 'no reason given',
'url' => $proxyServer,
'app' => 'notifications',
]);
}
}
}
/**
* @param Key $userKey
* @param array $device
* @param INotification $notification
* @return array
* @throws InvalidTokenException
* @throws \InvalidArgumentException
*/
protected function encryptAndSign(Key $userKey, array $device, INotification $notification) {
// Check if the token is still valid...
$this->tokenProvider->getTokenById($device['token']);
$data = [
'app' => $notification->getApp(),
'subject' => $notification->getParsedSubject(),
];
if (!openssl_public_encrypt(json_encode($data), $encryptedSubject, $device['devicepublickey'], OPENSSL_PKCS1_PADDING)) {
$this->log->error(openssl_error_string(), ['app' => 'notifications']);
throw new \InvalidArgumentException('Failed to encrypt message for device');
}
openssl_sign($encryptedSubject, $signature, $userKey->getPrivate(), OPENSSL_ALGO_SHA512);
$base64EncryptedSubject = base64_encode($encryptedSubject);
$base64Signature = base64_encode($signature);
return [
'deviceIdentifier' => $device['deviceidentifier'],
'pushTokenHash' => $device['pushtokenhash'],
'subject' => $base64EncryptedSubject,
'signature' => $base64Signature,
];
}
/**
* @param string $uid
* @return array[]
*/
protected function getDevicesForUser($uid) {
$query = $this->db->getQueryBuilder();
$query->select('*')
->from('notifications_pushtokens')
->where($query->expr()->eq('uid', $query->createNamedParameter($uid)));
$result = $query->execute();
$devices = $result->fetchAll();
$result->closeCursor();
return $devices;
}
/**
* @param int $tokenId
* @return bool
*/
protected function deletePushToken($tokenId) {
$query = $this->db->getQueryBuilder();
$query->delete('notifications_pushtokens')
->where($query->expr()->eq('token', $query->createNamedParameter($tokenId, IQueryBuilder::PARAM_INT)));
return $query->execute() !== 0;
}
}
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