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<?php
declare(strict_types=1);
/**
* @copyright Copyright (c) 2020 Robin Appelman <robin@icewind.nl>
*
* @author Robin Appelman <robin@icewind.nl>
*
* @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 OC\Files\Stream;
use Icewind\Streams\Wrapper;
class HashWrapper extends Wrapper {
protected $callback;
protected $hash;
public static function wrap($source, string $algo, callable $callback) {
$hash = hash_init($algo);
$context = stream_context_create([
'hash' => [
'source' => $source,
'callback' => $callback,
'hash' => $hash,
],
]);
return Wrapper::wrapSource($source, $context, 'hash', self::class);
}
protected function open() {
$context = $this->loadContext('hash');
$this->callback = $context['callback'];
$this->hash = $context['hash'];
return true;
}
public function dir_opendir($path, $options) {
return $this->open();
}
public function stream_open($path, $mode, $options, &$opened_path) {
return $this->open();
}
public function stream_read($count) {
$result = parent::stream_read($count);
hash_update($this->hash, $result);
return $result;
}
public function stream_close() {
if (is_callable($this->callback)) {
// if the stream is closed as a result of the end-of-request GC, the hash context might be cleaned up before this stream
if ($this->hash instanceof \HashContext) {
try {
$hash = @hash_final($this->hash);
if ($hash) {
call_user_func($this->callback, $hash);
}
} catch (\Throwable $e) {
}
}
// prevent further calls by potential PHP 7 GC ghosts
$this->callback = null;
}
return parent::stream_close();
}
}
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