Rewrite of session management

app/Core/Session/FlashMessage.php

@@ -0,0 +1,71 @@
+<?php
+
+namespace Kanboard\Core\Session;
+
+use Kanboard\Core\Base;
+
+/**
+ * Session Flash Message
+ *
+ * @package  session
+ * @author   Frederic Guillot
+ */
+class FlashMessage extends Base
+{
+    /**
+     * Add success message
+     *
+     * @access public
+     * @param  string  $message
+     */
+    public function success($message)
+    {
+        $this->setMessage('success', $message);
+    }
+
+    /**
+     * Add failure message
+     *
+     * @access public
+     * @param  string  $message
+     */
+    public function failure($message)
+    {
+        $this->setMessage('failure', $message);
+    }
+
+    /**
+     * Add new flash message
+     *
+     * @access public
+     * @param  string  $key
+     * @param  string  $message
+     */
+    public function setMessage($key, $message)
+    {
+        if (! isset($this->sessionStorage->flash)) {
+            $this->sessionStorage->flash = array();
+        }
+
+        $this->sessionStorage->flash[$key] = $message;
+    }
+
+    /**
+     * Get flash message
+     *
+     * @access public
+     * @param  string  $key
+     * @return string
+     */
+    public function getMessage($key)
+    {
+        $message = '';
+
+        if (isset($this->sessionStorage->flash[$key])) {
+            $message = $this->sessionStorage->flash[$key];
+            unset($this->sessionStorage->flash[$key]);
+        }
+
+        return $message;
+    }
+}