1 files changed, 100 insertions, 0 deletions
diff --git a/lib/session/CacheSessionHandler.php b/lib/session/CacheSessionHandler.php
new file mode 100644
index 0000000..c416ceb
--- /dev/null
+++ b/lib/session/CacheSessionHandler.php
@@ -0,0 +1,100 @@
+<?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;
+
+class CacheSessionHandler implements \SessionHandlerInterface, \SessionIdInterface, \SessionUpdateTimestampHandlerInterface
+{
+
+    const CACHE_KEY_PREFIX = 'session_data';
+
+    private $session_lifetime = 7200;
+
+    private $cache;
+
+    public function __construct($session_lifetime = null)
+    {
+        if ($session_lifetime) {
+            $this->session_lifetime = $session_lifetime;
+        }
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public function close(): bool
+    {
+        return true;
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public function destroy($id): bool
+    {
+        $cache_key = self::CACHE_KEY_PREFIX . '/' . $id;
+        $this->cache->expire($cache_key);
+        return true;
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public function gc($max_lifetime): int|false
+    {
+        return false;
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public function open($path, $name): bool
+    {
+        $this->cache = \Studip\Cache\Factory::getCache();
+        return true;
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public function read($id): string|false
+    {
+        $cache_key = self::CACHE_KEY_PREFIX . '/' . $id;
+        return $this->cache->read($cache_key);
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public function write($id, $data): bool
+    {
+        $cache_key = self::CACHE_KEY_PREFIX . '/' . $id;
+        return (bool)$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);
+    }
+}