Store PHP sessions in the database

app/Core/Session/FlashMessage.php

@@ -7,7 +7,7 @@ use Kanboard\Core\Base;
 /**
  * Session Flash Message
  *
- * @package  session
+ * @package  Kanboard\Core\Session
  * @author   Frederic Guillot
  */
 class FlashMessage extends Base
@@ -43,11 +43,11 @@ class FlashMessage extends Base
      */
     public function setMessage($key, $message)
     {
-        if (! isset($this->sessionStorage->flash)) {
-            $this->sessionStorage->flash = array();
+        if (! session_exists('flash')) {
+            session_set('flash', []);
         }
 
-        $this->sessionStorage->flash[$key] = $message;
+        session_merge('flash', [$key => $message]);
     }
 
     /**
@@ -61,9 +61,14 @@ class FlashMessage extends Base
     {
         $message = '';
 
-        if (isset($this->sessionStorage->flash[$key])) {
-            $message = $this->sessionStorage->flash[$key];
-            unset($this->sessionStorage->flash[$key]);
+        if (session_exists('flash')) {
+            $messages = session_get('flash');
+
+            if (isset($messages[$key])) {
+                $message = $messages[$key];
+                unset($messages[$key]);
+                session_set('flash', $messages);
+            }
         }
 
         return $message;

app/Core/Session/SessionHandler.php

@@ -0,0 +1,70 @@
+<?php
+
+namespace Kanboard\Core\Session;
+
+use PicoDb\Database;
+use SessionHandlerInterface;
+
+/**
+ * Class SessionHandler
+ *
+ * @package Kanboard\Core\Session
+ */
+class SessionHandler implements SessionHandlerInterface
+{
+    const TABLE = 'sessions';
+
+    /**
+     * @var Database
+     */
+    private $db;
+
+    public function __construct(Database $db)
+    {
+        $this->db = $db;
+    }
+
+    public function close()
+    {
+        return true;
+    }
+
+    public function destroy($sessionID)
+    {
+        return $this->db->table(self::TABLE)->eq('id', $sessionID)->remove();
+    }
+
+    public function gc($maxlifetime)
+    {
+        return $this->db->table(self::TABLE)->lt('expire_at', time())->remove();
+    }
+
+    public function open($savePath, $name)
+    {
+        return true;
+    }
+
+    public function read($sessionID)
+    {
+        $result = $this->db->table(self::TABLE)->eq('id', $sessionID)->findOneColumn('data');
+        return $result ?: '';
+    }
+
+    public function write($sessionID, $data)
+    {
+        $lifetime = time() + (ini_get('session.gc_maxlifetime') ?: 1440);
+
+        if ($this->db->table(self::TABLE)->eq('id', $sessionID)->exists()) {
+            return $this->db->table(self::TABLE)->eq('id', $sessionID)->update(array(
+                'expire_at' => $lifetime,
+                'data'      => $data,
+            ));
+        }
+
+        return $this->db->table(self::TABLE)->insert(array(
+            'id'        => $sessionID,
+            'expire_at' => $lifetime,
+            'data'      => $data,
+        ));
+    }
+}

app/Core/Session/SessionManager.php

@@ -7,7 +7,7 @@ use Kanboard\Core\Base;
 /**
  * Session Manager
  *
- * @package  session
+ * @package  Kanboard\Core\Session
  * @author   Frederic Guillot
  */
 class SessionManager extends Base
@@ -38,6 +38,8 @@ class SessionManager extends Base
      */
     public function open()
     {
+        session_set_save_handler(new SessionHandler($this->db), true);
+
         $this->configure();
 
         if (ini_get('session.auto_start') == 1) {
@@ -46,8 +48,6 @@ class SessionManager extends Base
 
         session_name('KB_SID');
         session_start();
-
-        $this->sessionStorage->setStorage($_SESSION);
     }
 
     /**

app/Core/Session/SessionStorage.php

@@ -1,92 +0,0 @@
-<?php
-
-namespace Kanboard\Core\Session;
-
-/**
- * Session Storage
- *
- * @package  session
- * @author   Frederic Guillot
- *
- * @property array  $user
- * @property array  $flash
- * @property array  $csrf
- * @property array  $postAuthenticationValidated
- * @property array  $filters
- * @property string $redirectAfterLogin
- * @property string $captcha
- * @property string $commentSorting
- * @property bool   $hasSubtaskInProgress
- * @property bool   $hasRememberMe
- * @property bool   $subtaskListToggle
- * @property string $scope
- * @property bool   $twoFactorBeforeCodeCalled
- * @property string $twoFactorSecret
- * @property string $oauthState
- * @property int    $smsTwoFactorSecret
- */
-class SessionStorage
-{
-    /**
-     * Pointer to external storage
-     *
-     * @access private
-     * @var array
-     */
-    private $storage = array();
-
-    /**
-     * Set external storage
-     *
-     * @access public
-     * @param  array  $storage  External session storage (example: $_SESSION)
-     */
-    public function setStorage(array &$storage)
-    {
-        $this->storage =& $storage;
-
-        // Load dynamically existing session variables into object properties
-        foreach ($storage as $key => $value) {
-            $this->$key = $value;
-        }
-    }
-
-    /**
-     * Get all session variables
-     *
-     * @access public
-     * @return array
-     */
-    public function getAll()
-    {
-        $session = get_object_vars($this);
-        unset($session['storage']);
-
-        return $session;
-    }
-
-    /**
-     * Flush session data
-     *
-     * @access public
-     */
-    public function flush()
-    {
-        $session = get_object_vars($this);
-        unset($session['storage']);
-
-        foreach (array_keys($session) as $property) {
-            unset($this->$property);
-        }
-    }
-
-    /**
-     * Copy class properties to external storage
-     *
-     * @access public
-     */
-    public function __destruct()
-    {
-        $this->storage = $this->getAll();
-    }
-}