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<?php
/**
* Session handler for using Stud.IP Cache as session storage
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* @author André Noack <noack@data-quest.de>
*/
namespace Studip\Session;
use SessionHandlerInterface;
use SessionIdInterface;
use SessionUpdateTimestampHandlerInterface;
use Studip\Cache\Cache;
use Studip\Cache\Factory;
class CacheSessionHandler implements
SessionHandlerInterface,
SessionIdInterface,
SessionUpdateTimestampHandlerInterface
{
private const CACHE_KEY_PREFIX = 'session_data';
private int $session_lifetime = 7200;
private Cache $cache;
public function __construct(?int $session_lifetime = null)
{
if ($session_lifetime) {
$this->session_lifetime = $session_lifetime;
}
}
public function close(): bool
{
return true;
}
public function destroy(string $id): bool
{
$cache_key = self::CACHE_KEY_PREFIX . '/' . $id;
$this->cache->expire($cache_key);
return true;
}
public function gc(int $max_lifetime): int|false
{
return false;
}
public function open(string $path, string $name): bool
{
$this->cache = Factory::getCache();
return true;
}
public function read(string $id): string|false
{
$cache_key = self::CACHE_KEY_PREFIX . '/' . $id;
return $this->cache->read($cache_key);
}
public function write(string $id, string $data): bool
{
$cache_key = self::CACHE_KEY_PREFIX . '/' . $id;
return $this->cache->write($cache_key, $data, $this->session_lifetime);
}
public function create_sid(): string
{
do {
$new_id = md5(bin2hex(random_bytes(128)));
} while ($this->read($new_id));
return $new_id;
}
public function updateTimestamp(string $id, string $data): bool
{
return $this->write($id, $data);
}
public function validateId(string $id): bool
{
return (bool) $this->read($id);
}
}
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