1 files changed, 125 insertions, 0 deletions
diff --git a/library/Icinga/Web/Window.php b/library/Icinga/Web/Window.php
new file mode 100644
index 0000000..158483a
--- /dev/null
+++ b/library/Icinga/Web/Window.php
@@ -0,0 +1,125 @@
+<?php
+/* Icinga Web 2 | (c) 2014 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Web;
+
+use Icinga\Application\Icinga;
+use Icinga\Web\Session\SessionNamespace;
+
+class Window
+{
+    const UNDEFINED = 'undefined';
+
+    /** @var Window */
+    protected static $window;
+
+    /** @var string */
+    protected $id;
+
+    /** @var string */
+    protected $containerId;
+
+    public function __construct($id)
+    {
+        $parts = explode('_', $id, 2);
+        if (isset($parts[1])) {
+            $this->id = $parts[0];
+            $this->containerId = $id;
+        } else {
+            $this->id = $id;
+        }
+    }
+
+    /**
+     * Get whether the window's ID is undefined
+     *
+     * @return bool
+     */
+    public function isUndefined()
+    {
+        return $this->id === self::UNDEFINED;
+    }
+
+    /**
+     * Get the window's ID
+     *
+     * @return string
+     */
+    public function getId()
+    {
+        return $this->id;
+    }
+
+    /**
+     * Get the container's ID
+     *
+     * @return string
+     */
+    public function getContainerId()
+    {
+        return $this->containerId ?: $this->id;
+    }
+
+    /**
+     * Return a window-aware session by using the given prefix
+     *
+     * @param   string      $prefix     The prefix to use
+     * @param   bool        $reset      Whether to reset any existing session-data
+     *
+     * @return  SessionNamespace
+     */
+    public function getSessionNamespace($prefix, $reset = false)
+    {
+        $session = Session::getSession();
+
+        $identifier = $prefix . '_' . $this->getId();
+        if ($reset && $session->hasNamespace($identifier)) {
+            $session->removeNamespace($identifier);
+        }
+
+        $namespace = $session->getNamespace($identifier);
+        $nsUndef = $prefix . '_' . self::UNDEFINED;
+
+        if (! $reset && ! $this->isUndefined() && $session->hasNamespace($nsUndef)) {
+            // We may not have any window-id on the very first request. Now we add
+            // all values from the namespace, that has been created in this case,
+            // to the new one and remove it afterwards.
+            foreach ($session->getNamespace($nsUndef) as $name => $value) {
+                $namespace->set($name, $value);
+            }
+
+            $session->removeNamespace($nsUndef);
+        }
+
+        return $namespace;
+    }
+
+    /**
+     * Generate a random string
+     *
+     * @return string
+     */
+    public static function generateId()
+    {
+        $letters = 'abcefghijklmnopqrstuvwxyz';
+        return substr(str_shuffle($letters), 0, 12);
+    }
+
+    /**
+     * @return Window
+     */
+    public static function getInstance()
+    {
+        if (! isset(static::$window)) {
+            $id = Icinga::app()->getRequest()->getHeader('X-Icinga-WindowId');
+            if (empty($id) || $id === static::UNDEFINED) {
+                Icinga::app()->getResponse()->setOverrideWindowId();
+                $id = static::generateId();
+            }
+
+            static::$window = new Window($id);
+        }
+
+        return static::$window;
+    }
+}