[glib] Add GNotification



commit 639bd3626b683a0be273462d47e6bc30351a77d1
Author: Lars Uebernickel <lars uebernic de>
Date:   Tue Oct 15 11:21:10 2013 -0400

    Add GNotification
    
    https://bugzilla.gnome.org/show_bug.cgi?id=688492

 gio/Makefile.am               |    6 +
 gio/gapplication.c            |   99 +++++++
 gio/gapplication.h            |    8 +
 gio/gfdonotificationbackend.c |  405 ++++++++++++++++++++++++++
 gio/gio.h                     |    1 +
 gio/giomodule.c               |    9 +
 gio/giotypes.h                |    2 +
 gio/gnotification-private.h   |   54 ++++
 gio/gnotification.c           |  639 +++++++++++++++++++++++++++++++++++++++++
 gio/gnotification.h           |   94 ++++++
 gio/gnotificationbackend.c    |  112 +++++++
 gio/gnotificationbackend.h    |   83 ++++++
 12 files changed, 1512 insertions(+), 0 deletions(-)
---
diff --git a/gio/Makefile.am b/gio/Makefile.am
index 5142237..a6fd62c 100644
--- a/gio/Makefile.am
+++ b/gio/Makefile.am
@@ -152,6 +152,9 @@ application_headers = \
        gmenu.h                         \
        gmenuexporter.h                 \
        gdbusmenumodel.h                \
+       gnotification.h                 \
+       gnotification-private.h         \
+       gnotificationbackend.h          \
        $(NULL)
 
 application_sources = \
@@ -175,6 +178,8 @@ application_sources = \
        gmenu.c                                 \
        gmenuexporter.c                         \
        gdbusmenumodel.c                        \
+       gnotification.c                         \
+       gnotificationbackend.c                  \
        $(NULL)
 
 local_sources = \
@@ -261,6 +266,7 @@ unix_sources = \
        gunixoutputstream.c     \
        gcontenttype.c          \
        gcontenttypeprivate.h   \
+       gfdonotificationbackend.c \
        $(NULL)
 
 
diff --git a/gio/gapplication.c b/gio/gapplication.c
index f20e01f..d3132e1 100644
--- a/gio/gapplication.c
+++ b/gio/gapplication.c
@@ -32,6 +32,9 @@
 #include "gactionmap.h"
 #include "gmenumodel.h"
 #include "gsettings.h"
+#include "gnotification-private.h"
+#include "gnotificationbackend.h"
+#include "gdbusutils.h"
 
 #include "gioenumtypes.h"
 #include "gioenums.h"
@@ -249,6 +252,8 @@ struct _GApplicationPrivate
 
   GRemoteActionGroup *remote_actions;
   GApplicationImpl   *impl;
+
+  GNotificationBackend *notifications;
 };
 
 enum
@@ -686,6 +691,9 @@ g_application_finalize (GObject *object)
   if (application->priv->actions)
     g_object_unref (application->priv->actions);
 
+  if (application->priv->notifications)
+    g_object_unref (application->priv->notifications);
+
   G_OBJECT_CLASS (g_application_parent_class)
     ->finalize (object);
 }
@@ -1919,5 +1927,96 @@ g_application_unmark_busy (GApplication *application)
     g_application_impl_set_busy_state (application->priv->impl, FALSE);
 }
 
+/* Notifications {{{1 */
+
+/**
+ * g_application_send_notification:
+ * @application: a #GApplication
+ * @id: (allow-none): id of the notification, or %NULL
+ * @notification: the #GNotification to send
+ *
+ * Sends a notification on behalf of @application to the desktop shell.
+ * There is no guarantee that the notification is displayed immediately,
+ * or even at all.
+ *
+ * Notifications may persist after the application exits. It will be
+ * D-Bus-activated when the notification or one of its actions is
+ * activated.
+ *
+ * Modifying @notification after this call has no effect. However, the
+ * object can be reused for a later call to this function.
+ *
+ * @id may be any string that uniquely identifies the event for the
+ * application. It does not need to be in any special format. For
+ * example, "new-message" might be appropriate for a notification about
+ * new messages.
+ *
+ * If a previous notification was sent with the same @id, it will be
+ * replaced with @notification and shown again as if it was a new
+ * notification. This works even for notifications sent from a previous
+ * execution of the application, as long as @id is the same string.
+ *
+ * @id may be %NULL, but it is impossible to replace or withdraw
+ * notifications without an id.
+ *
+ * If @notification is no longer relevant, it can be withdrawn with
+ * g_application_withdraw_notification().
+ *
+ * Since: 2.40
+ */
+void
+g_application_send_notification (GApplication  *application,
+                                 const gchar   *id,
+                                 GNotification *notification)
+{
+  gchar *generated_id = NULL;
+
+  g_return_if_fail (G_IS_APPLICATION (application));
+  g_return_if_fail (G_IS_NOTIFICATION (notification));
+  g_return_if_fail (g_application_get_is_registered (application));
+  g_return_if_fail (!g_application_get_is_remote (application));
+
+  if (application->priv->notifications == NULL)
+    application->priv->notifications = g_notification_backend_new_default (application);
+
+  if (id == NULL)
+    {
+      generated_id = g_dbus_generate_guid ();
+      id = generated_id;
+    }
+
+  g_notification_backend_send_notification (application->priv->notifications, id, notification);
+
+  g_free (generated_id);
+}
+
+/**
+ * g_application_withdraw_notification:
+ * @application: a #GApplication
+ * @id: id of a previously sent notification
+ *
+ * Withdraws a notification that was sent with
+ * g_application_send_notification().
+ *
+ * This call does nothing if a notification with @id doesn't exist or
+ * the notification was never sent.
+ *
+ * This function works even for notifications sent in previous
+ * executions of this application, as long @id is the same as it was for
+ * the sent notification.
+ *
+ * Since: 2.40
+ */
+void
+g_application_withdraw_notification (GApplication *application,
+                                     const gchar  *id)
+{
+  g_return_if_fail (G_IS_APPLICATION (application));
+  g_return_if_fail (id != NULL);
+
+  if (application->priv->notifications)
+    g_notification_backend_withdraw_notification (application->priv->notifications, id);
+}
+
 /* Epilogue {{{1 */
 /* vim:set foldmethod=marker: */
diff --git a/gio/gapplication.h b/gio/gapplication.h
index 5878a7f..d9c72df 100644
--- a/gio/gapplication.h
+++ b/gio/gapplication.h
@@ -201,6 +201,14 @@ void                    g_application_mark_busy                         (GApplic
 GLIB_AVAILABLE_IN_2_38
 void                    g_application_unmark_busy                       (GApplication             
*application);
 
+GLIB_AVAILABLE_IN_2_40
+void                    g_application_send_notification                 (GApplication             
*application,
+                                                                         const gchar              *id,
+                                                                         GNotification            
*notification);
+GLIB_AVAILABLE_IN_2_40
+void                    g_application_withdraw_notification             (GApplication             
*application,
+                                                                         const gchar              *id);
+
 G_END_DECLS
 
 #endif /* __G_APPLICATION_H__ */
diff --git a/gio/gfdonotificationbackend.c b/gio/gfdonotificationbackend.c
new file mode 100644
index 0000000..91af278
--- /dev/null
+++ b/gio/gfdonotificationbackend.c
@@ -0,0 +1,405 @@
+/*
+ * Copyright © 2013 Lars Uebernickel
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General
+ * Public License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place, Suite 330,
+ * Boston, MA 02111-1307, USA.
+ *
+ * Authors: Lars Uebernickel <lars uebernic de>
+ */
+
+#include "gnotificationbackend.h"
+
+#include "gapplication.h"
+#include "giomodule-priv.h"
+#include "gnotification-private.h"
+#include "gdbusconnection.h"
+#include "gaction.h"
+#include "gfileicon.h"
+#include "gfile.h"
+#include "gdbusutils.h"
+
+#define G_TYPE_FDO_NOTIFICATION_BACKEND  (g_fdo_notification_backend_get_type ())
+#define G_FDO_NOTIFICATION_BACKEND(o)    (G_TYPE_CHECK_INSTANCE_CAST ((o), G_TYPE_FDO_NOTIFICATION_BACKEND, 
GFdoNotificationBackend))
+
+typedef struct _GFdoNotificationBackend GFdoNotificationBackend;
+typedef GNotificationBackendClass       GFdoNotificationBackendClass;
+
+struct _GFdoNotificationBackend
+{
+  GNotificationBackend parent;
+
+  guint   notify_subscription;
+  GSList *notifications;
+};
+
+GType g_fdo_notification_backend_get_type (void);
+
+G_DEFINE_TYPE_WITH_CODE (GFdoNotificationBackend, g_fdo_notification_backend, G_TYPE_NOTIFICATION_BACKEND,
+  _g_io_modules_ensure_extension_points_registered ();
+  g_io_extension_point_implement (G_NOTIFICATION_BACKEND_EXTENSION_POINT_NAME,
+                                 g_define_type_id, "freedesktop", 0))
+
+typedef struct
+{
+  GFdoNotificationBackend *backend;
+  gchar *id;
+  guint32 notify_id;
+  gchar *default_action;
+  GVariant *default_action_target;
+} FreedesktopNotification;
+
+
+static void
+freedesktop_notification_free (gpointer data)
+{
+  FreedesktopNotification *n = data;
+
+  g_free (n->id);
+  g_free (n->default_action);
+  if (n->default_action_target)
+    g_variant_unref (n->default_action_target);
+
+  g_slice_free (FreedesktopNotification, n);
+}
+
+static FreedesktopNotification *
+g_fdo_notification_backend_find_notification (GFdoNotificationBackend *backend,
+                                              const gchar             *id)
+{
+  GSList *it;
+
+  for (it = backend->notifications; it != NULL; it = it->next)
+    {
+      FreedesktopNotification *n = it->data;
+      if (g_str_equal (n->id, id))
+        return n;
+    }
+
+  return NULL;
+}
+
+static FreedesktopNotification *
+g_fdo_notification_backend_find_notification_by_notify_id (GFdoNotificationBackend *backend,
+                                                           guint32                  id)
+{
+  GSList *it;
+
+  for (it = backend->notifications; it != NULL; it = it->next)
+    {
+      FreedesktopNotification *n = it->data;
+      if (n->notify_id == id)
+        return n;
+    }
+
+  return NULL;
+}
+
+static void
+notify_signal (GDBusConnection *connection,
+               const gchar     *sender_name,
+               const gchar     *object_path,
+               const gchar     *interface_name,
+               const gchar     *signal_name,
+               GVariant        *parameters,
+               gpointer         user_data)
+{
+  GFdoNotificationBackend *backend = user_data;
+  guint32 id = 0;
+  const gchar *action = NULL;
+  FreedesktopNotification *n;
+
+  if (g_str_equal (signal_name, "NotificationClosed") &&
+      g_variant_is_of_type (parameters, G_VARIANT_TYPE ("(uu)")))
+    {
+      g_variant_get (parameters, "(uu)", &id, NULL);
+    }
+  else if (g_str_equal (signal_name, "ActionInvoked") &&
+           g_variant_is_of_type (parameters, G_VARIANT_TYPE ("(us)")))
+    {
+      g_variant_get (parameters, "(u&s)", &id, &action);
+    }
+  else
+    return;
+
+  n = g_fdo_notification_backend_find_notification_by_notify_id (backend, id);
+  if (n == NULL)
+    return;
+
+  if (action)
+    {
+      if (g_str_equal (action, "default"))
+        {
+          g_notification_backend_activate_action (G_NOTIFICATION_BACKEND (backend),
+                                                  n->default_action,
+                                                  n->default_action_target);
+        }
+      else
+        {
+          gchar *name;
+          GVariant *target;
+
+          if (g_action_parse_detailed_name (action, &name, &target, NULL))
+            {
+              g_notification_backend_activate_action (G_NOTIFICATION_BACKEND (backend), name, target);
+              g_free (name);
+              if (target)
+                g_variant_unref (target);
+            }
+        }
+    }
+
+  backend->notifications = g_slist_remove (backend->notifications, n);
+  freedesktop_notification_free (n);
+}
+
+static void
+call_notify (GDBusConnection     *con,
+             GApplication        *app,
+             guint32              replace_id,
+             GNotification       *notification,
+             GAsyncReadyCallback  callback,
+             gpointer             user_data)
+{
+  GVariantBuilder action_builder;
+  guint n_buttons;
+  guint i;
+  GVariantBuilder hints_builder;
+  GIcon *image;
+  GVariant *parameters;
+  const gchar *body;
+
+  g_variant_builder_init (&action_builder, G_VARIANT_TYPE_STRING_ARRAY);
+  if (g_notification_get_default_action (notification, NULL, NULL))
+    {
+      g_variant_builder_add (&action_builder, "s", "default");
+      g_variant_builder_add (&action_builder, "s", "");
+    }
+
+  n_buttons = g_notification_get_n_buttons (notification);
+  for (i = 0; i < n_buttons; i++)
+    {
+      gchar *label;
+      gchar *action;
+      GVariant *target;
+      gchar *detailed_name;
+
+      g_notification_get_button (notification, i, &label, &action, &target);
+      detailed_name = g_action_print_detailed_name (action, target);
+
+      /* Actions named 'default' collide with libnotify's naming of the
+       * default action. Rewriting them to something unique is enough,
+       * because those actions can never be activated (they aren't
+       * prefixed with 'app.').
+       */
+      if (g_str_equal (detailed_name, "default"))
+        {
+          g_free (detailed_name);
+          detailed_name = g_dbus_generate_guid ();
+        }
+
+      g_variant_builder_add_value (&action_builder, g_variant_new_take_string (detailed_name));
+      g_variant_builder_add_value (&action_builder, g_variant_new_take_string (label));
+
+      g_free (action);
+      if (target)
+        g_variant_unref (target);
+    }
+
+  g_variant_builder_init (&hints_builder, G_VARIANT_TYPE ("a{sv}"));
+  g_variant_builder_add (&hints_builder, "{sv}", "desktop-entry",
+                         g_variant_new_string (g_application_get_application_id (app)));
+  if (g_notification_get_urgent (notification))
+    g_variant_builder_add (&hints_builder, "{sv}", "urgency", g_variant_new_byte (2));
+  image = g_notification_get_image (notification);
+  if (image != NULL && G_IS_FILE_ICON (image))
+    {
+      GFile *file;
+
+      file = g_file_icon_get_file (G_FILE_ICON (image));
+      g_variant_builder_add (&hints_builder, "{sv}", "image-path",
+                             g_variant_new_take_string (g_file_get_uri (file)));
+    }
+
+  body = g_notification_get_body (notification);
+
+  parameters = g_variant_new ("(susssasa{sv}i)",
+                              "",           /* app name */
+                              replace_id,
+                              "",           /* app icon */
+                              g_notification_get_title (notification),
+                              body ? body : "",
+                              &action_builder,
+                              &hints_builder,
+                              -1);          /* expire_timeout */
+
+  g_dbus_connection_call (con, "org.freedesktop.Notifications", "/org/freedesktop/Notifications",
+                          "org.freedesktop.Notifications", "Notify",
+                          parameters, G_VARIANT_TYPE ("(u)"),
+                          G_DBUS_CALL_FLAGS_NONE, -1, NULL,
+                          callback, user_data);
+}
+
+static void
+notification_sent (GObject      *source_object,
+                   GAsyncResult *result,
+                   gpointer      user_data)
+{
+  FreedesktopNotification *n = user_data;
+  GVariant *val;
+  GError *error = NULL;
+  static gboolean warning_printed = FALSE;
+
+  val = g_dbus_connection_call_finish (G_DBUS_CONNECTION (source_object), result, &error);
+  if (val)
+    {
+      g_variant_get (val, "(u)", &n->notify_id);
+      g_variant_unref (val);
+    }
+  else
+    {
+      if (!warning_printed)
+        {
+          g_warning ("unable to send notifications through org.freedesktop.Notifications: %s",
+                     error->message);
+          warning_printed = TRUE;
+        }
+
+      n->backend->notifications = g_slist_remove (n->backend->notifications, n);
+      freedesktop_notification_free (n);
+
+      g_error_free (error);
+    }
+}
+
+static void
+g_fdo_notification_backend_dispose (GObject *object)
+{
+  GFdoNotificationBackend *backend = G_FDO_NOTIFICATION_BACKEND (object);
+
+  if (backend->notify_subscription)
+    {
+      GDBusConnection *session_bus;
+
+      session_bus = g_notification_backend_get_dbus_connection (G_NOTIFICATION_BACKEND (backend));
+      g_dbus_connection_signal_unsubscribe (session_bus, backend->notify_subscription);
+      backend->notify_subscription = 0;
+    }
+
+  if (backend->notifications)
+    {
+      g_slist_free_full (backend->notifications, freedesktop_notification_free);
+      backend->notifications = NULL;
+    }
+
+  G_OBJECT_CLASS (g_fdo_notification_backend_parent_class)->dispose (object);
+}
+
+static gboolean
+g_fdo_notification_backend_is_supported (void)
+{
+  /* This is the fallback backend with the lowest priority. To avoid an
+   * unnecessary synchronous dbus call to check for
+   * org.freedesktop.Notifications, this function always succeeds. A
+   * warning will be printed when sending the first notification fails.
+   */
+  return TRUE;
+}
+
+static void
+g_fdo_notification_backend_send_notification (GNotificationBackend *backend,
+                                              const gchar          *id,
+                                              GNotification        *notification)
+{
+  GFdoNotificationBackend *self = G_FDO_NOTIFICATION_BACKEND (backend);
+  FreedesktopNotification *n;
+
+  if (self->notify_subscription == 0)
+    {
+      self->notify_subscription =
+        g_dbus_connection_signal_subscribe (g_notification_backend_get_dbus_connection (backend),
+                                            "org.freedesktop.Notifications",
+                                            "org.freedesktop.Notifications", NULL,
+                                            "/org/freedesktop/Notifications", NULL,
+                                            G_DBUS_SIGNAL_FLAGS_NONE,
+                                            notify_signal, backend, NULL);
+    }
+
+  n = g_fdo_notification_backend_find_notification (self, id);
+  if (n == NULL)
+    {
+      n = g_slice_new (FreedesktopNotification);
+      n->backend = self;
+      n->id = g_strdup (id);
+      n->notify_id = 0;
+
+      n->backend->notifications = g_slist_prepend (n->backend->notifications, n);
+    }
+  else
+    {
+      /* Only clear default action. All other fields are still valid */
+      g_free (n->default_action);
+      if (n->default_action_target)
+        g_variant_unref (n->default_action_target);
+    }
+
+  g_notification_get_default_action (notification, &n->default_action, &n->default_action_target);
+
+  call_notify (g_notification_backend_get_dbus_connection (backend),
+               g_notification_backend_get_application (backend),
+               n->notify_id, notification, notification_sent, n);
+}
+
+static void
+g_fdo_notification_backend_withdraw_notification (GNotificationBackend *backend,
+                                                  const gchar          *id)
+{
+  GFdoNotificationBackend *self = G_FDO_NOTIFICATION_BACKEND (backend);
+  FreedesktopNotification *n;
+
+  n = g_fdo_notification_backend_find_notification (self, id);
+  if (n)
+    {
+      if (n->notify_id > 0)
+        {
+          g_dbus_connection_call (g_notification_backend_get_dbus_connection (backend),
+                                  "org.freedesktop.Notifications",
+                                  "/org/freedesktop/Notifications",
+                                  "org.freedesktop.Notifications", "CloseNotification",
+                                  g_variant_new ("(u)", n->id), NULL,
+                                  G_DBUS_CALL_FLAGS_NONE, -1, NULL, NULL, NULL);
+        }
+
+      self->notifications = g_slist_remove (self->notifications, n);
+      freedesktop_notification_free (n);
+    }
+}
+
+static void
+g_fdo_notification_backend_init (GFdoNotificationBackend *backend)
+{
+}
+
+static void
+g_fdo_notification_backend_class_init (GFdoNotificationBackendClass *class)
+{
+  GObjectClass *object_class = G_OBJECT_CLASS (class);
+  GNotificationBackendClass *backend_class = G_NOTIFICATION_BACKEND_CLASS (class);
+
+  object_class->dispose = g_fdo_notification_backend_dispose;
+
+  backend_class->is_supported = g_fdo_notification_backend_is_supported;
+  backend_class->send_notification = g_fdo_notification_backend_send_notification;
+  backend_class->withdraw_notification = g_fdo_notification_backend_withdraw_notification;
+}
diff --git a/gio/gio.h b/gio/gio.h
index 04a8770..a1c6804 100644
--- a/gio/gio.h
+++ b/gio/gio.h
@@ -161,6 +161,7 @@
 #include <gio/gmenu.h>
 #include <gio/gmenuexporter.h>
 #include <gio/gdbusmenumodel.h>
+#include <gio/gnotification.h>
 
 #undef __GIO_GIO_H_INSIDE__
 
diff --git a/gio/giomodule.c b/gio/giomodule.c
index a394c60..77624ad 100644
--- a/gio/giomodule.c
+++ b/gio/giomodule.c
@@ -37,6 +37,7 @@
 #include "gsocks5proxy.h"
 #include "gtlsbackend.h"
 #include "gvfs.h"
+#include "gnotificationbackend.h"
 #ifdef G_OS_WIN32
 #include "gregistrysettingsbackend.h"
 #endif
@@ -894,6 +895,10 @@ extern GType g_network_monitor_base_get_type (void);
 extern GType _g_network_monitor_netlink_get_type (void);
 #endif
 
+#ifdef G_OS_UNIX
+extern GType g_fdo_notification_backend_get_type (void);
+#endif
+
 #ifdef G_PLATFORM_WIN32
 
 #include <windows.h>
@@ -997,6 +1002,9 @@ _g_io_modules_ensure_extension_points_registered (void)
 
       ep = g_io_extension_point_register (G_NETWORK_MONITOR_EXTENSION_POINT_NAME);
       g_io_extension_point_set_required_type (ep, G_TYPE_NETWORK_MONITOR);
+
+      ep = g_io_extension_point_register (G_NOTIFICATION_BACKEND_EXTENSION_POINT_NAME);
+      g_io_extension_point_set_required_type (ep, G_TYPE_NOTIFICATION_BACKEND);
     }
   
   G_UNLOCK (registered_extensions);
@@ -1065,6 +1073,7 @@ _g_io_modules_ensure_loaded (void)
 #endif
 #ifdef G_OS_UNIX
       g_type_ensure (_g_unix_volume_monitor_get_type ());
+      g_type_ensure (g_fdo_notification_backend_get_type ());
 #endif
 #ifdef G_OS_WIN32
       g_type_ensure (_g_winhttp_vfs_get_type ());
diff --git a/gio/giotypes.h b/gio/giotypes.h
index 8267ab6..ffee9d2 100644
--- a/gio/giotypes.h
+++ b/gio/giotypes.h
@@ -62,6 +62,8 @@ typedef struct _GSettings                     GSettings;
 typedef struct _GPermission                   GPermission;
 
 typedef struct _GMenuModel                    GMenuModel;
+typedef struct _GNotificationBackend          GNotificationBackend;
+typedef struct _GNotification                 GNotification;
 
 /**
  * GDrive:
diff --git a/gio/gnotification-private.h b/gio/gnotification-private.h
new file mode 100644
index 0000000..9521b80
--- /dev/null
+++ b/gio/gnotification-private.h
@@ -0,0 +1,54 @@
+/*
+ * Copyright © 2013 Lars Uebernickel
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General
+ * Public License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place, Suite 330,
+ * Boston, MA 02111-1307, USA.
+ *
+ * Authors: Lars Uebernickel <lars uebernic de>
+ */
+
+#ifndef __G_NOTIFICATION_PRIVATE_H__
+#define __G_NOTIFICATION_PRIVATE_H__
+
+#include "gnotification.h"
+
+const gchar *           g_notification_get_id                           (GNotification *notification);
+
+const gchar *           g_notification_get_title                        (GNotification *notification);
+
+const gchar *           g_notification_get_body                         (GNotification *notification);
+
+GIcon *                 g_notification_get_image                        (GNotification *notification);
+
+gboolean                g_notification_get_urgent                       (GNotification *notification);
+
+guint                   g_notification_get_n_buttons                    (GNotification *notification);
+
+void                    g_notification_get_button                       (GNotification  *notification,
+                                                                         gint            index,
+                                                                         gchar         **label,
+                                                                         gchar         **action,
+                                                                         GVariant      **target);
+
+gint                    g_notification_get_button_with_action           (GNotification *notification,
+                                                                         const gchar   *action);
+
+gboolean                g_notification_get_default_action               (GNotification  *notification,
+                                                                         gchar         **action,
+                                                                         GVariant      **target);
+
+GVariant *              g_notification_serialize                        (GNotification *notification);
+
+#endif
diff --git a/gio/gnotification.c b/gio/gnotification.c
new file mode 100644
index 0000000..d912e9f
--- /dev/null
+++ b/gio/gnotification.c
@@ -0,0 +1,639 @@
+/*
+ * Copyright © 2013 Lars Uebernickel
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General
+ * Public License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place, Suite 330,
+ * Boston, MA 02111-1307, USA.
+ *
+ * Authors: Lars Uebernickel <lars uebernic de>
+ */
+
+#include "config.h"
+
+#include "gnotification-private.h"
+#include "gdbusutils.h"
+#include "gicon.h"
+#include "gaction.h"
+
+typedef GObjectClass GNotificationClass;
+
+struct _GNotification
+{
+  GObject parent;
+
+  gchar *title;
+  gchar *body;
+  GIcon *image;
+  gboolean urgent;
+  GPtrArray *buttons;
+  gchar *default_action;
+  GVariant *default_action_target;
+};
+
+typedef struct
+{
+  gchar *label;
+  gchar *action_name;
+  GVariant *target;
+} Button;
+
+G_DEFINE_TYPE (GNotification, g_notification, G_TYPE_OBJECT);
+
+static void
+button_free (gpointer data)
+{
+  Button *button = data;
+
+  g_free (button->label);
+  g_free (button->action_name);
+  if (button->target)
+    g_variant_unref (button->target);
+
+  g_slice_free (Button, button);
+}
+
+static void
+g_notification_dispose (GObject *object)
+{
+  GNotification *notification = G_NOTIFICATION (object);
+
+  g_clear_object (&notification->image);
+
+  G_OBJECT_CLASS (g_notification_parent_class)->dispose (object);
+}
+
+static void
+g_notification_finalize (GObject *object)
+{
+  GNotification *notification = G_NOTIFICATION (object);
+
+  g_free (notification->title);
+  g_free (notification->body);
+  g_free (notification->default_action);
+  if (notification->default_action_target)
+    g_variant_unref (notification->default_action_target);
+  g_ptr_array_free (notification->buttons, TRUE);
+
+  G_OBJECT_CLASS (g_notification_parent_class)->finalize (object);
+}
+
+static void
+g_notification_class_init (GNotificationClass *klass)
+{
+  GObjectClass *object_class = G_OBJECT_CLASS (klass);
+
+  object_class->dispose = g_notification_dispose;
+  object_class->finalize = g_notification_finalize;
+}
+
+static void
+g_notification_init (GNotification *notification)
+{
+  notification->buttons = g_ptr_array_new_full (2, button_free);
+}
+
+/**
+ * g_notification_new:
+ * @title: the title of the notification
+ *
+ * Creates a new #GNotification with @title as its title.
+ *
+ * After populating @notification with more details, it can be sent to
+ * the desktop shell with g_application_send_notification(). Changing
+ * any properties after this call will not have any effect until
+ * resending @notification.
+ *
+ * Returns: a new #GNotification instance
+ *
+ * Since: 2.40
+ */
+GNotification *
+g_notification_new (const gchar *title)
+{
+  GNotification *notification;
+
+  g_return_val_if_fail (title != NULL, NULL);
+
+  notification = g_object_new (G_TYPE_NOTIFICATION, NULL);
+  notification->title = g_strdup (title);
+
+  return notification;
+}
+
+/**
+ * g_notification_get_title:
+ * @notification: a #GNotification
+ *
+ * Gets the title of @notification.
+ *
+ * Returns: the title of @notification
+ *
+ * Since: 2.40
+ */
+const gchar *
+g_notification_get_title (GNotification *notification)
+{
+  g_return_val_if_fail (G_IS_NOTIFICATION (notification), NULL);
+
+  return notification->title;
+}
+
+/**
+ * g_notification_set_title:
+ * @notification: a #GNotification
+ * title: the new title for @notification
+ *
+ * Sets the title of @notification to @title.
+ *
+ * Since: 2.40
+ */
+void
+g_notification_set_title (GNotification *notification,
+                          const gchar   *title)
+{
+  g_return_if_fail (G_IS_NOTIFICATION (notification));
+  g_return_if_fail (title != NULL);
+
+  g_free (notification->title);
+
+  notification->title = g_strdup (title);
+}
+
+/**
+ * g_notification_get_body:
+ * @notification: a #GNotification
+ *
+ * Gets the current body of @notification.
+ *
+ * Returns: (allow-none): the body of @notification
+ *
+ * Since: 2.40
+ */
+const gchar *
+g_notification_get_body (GNotification *notification)
+{
+  g_return_val_if_fail (G_IS_NOTIFICATION (notification), NULL);
+
+  return notification->body;
+}
+
+/**
+ * g_notification_set_body:
+ * @notification: a #GNotification
+ * @body: (allow-none): the new body for @notification, or %NULL
+ *
+ * Sets the body of @notification to @body.
+ *
+ * Since: 2.40
+ */
+void
+g_notification_set_body (GNotification *notification,
+                         const gchar   *body)
+{
+  g_return_if_fail (G_IS_NOTIFICATION (notification));
+  g_return_if_fail (body != NULL);
+
+  g_free (notification->body);
+
+  notification->body = g_strdup (body);
+}
+
+/**
+ * g_notification_get_image:
+ * @notification: a #GNotification
+ *
+ * Gets the image currently set on @notification.
+ *
+ * Returns: (transfer none): the image associated with @notification
+ *
+ * Since: 2.40
+ */
+GIcon *
+g_notification_get_image (GNotification *notification)
+{
+  g_return_val_if_fail (G_IS_NOTIFICATION (notification), NULL);
+
+  return notification->image;
+}
+
+/**
+ * g_notification_set_image:
+ * @notification: a #GNotification
+ * @image: the image to be shown in @notification, as a #GIcon
+ *
+ * Sets the image of @notification to @image.
+ *
+ * Since: 2.40
+ */
+void
+g_notification_set_image (GNotification *notification,
+                          GIcon         *image)
+{
+  g_return_if_fail (G_IS_NOTIFICATION (notification));
+
+  if (notification->image)
+    g_object_unref (notification->image);
+
+  notification->image = g_object_ref (image);
+}
+
+/**
+ * g_notification_get_urgent:
+ * @notification: a #GNotification
+ *
+ * Returns %TRUE if @notification is marked as urgent.
+ *
+ * Since: 2.40
+ */
+gboolean
+g_notification_get_urgent (GNotification *notification)
+{
+  g_return_val_if_fail (G_IS_NOTIFICATION (notification), FALSE);
+
+  return notification->urgent;
+}
+
+/**
+ * g_notification_set_urgent:
+ * @notification: a #GNotification
+ * @urgent: %TRUE if @notification is urgent
+ *
+ * Sets or unsets whether @notification is marked as urgent.
+ *
+ * Since: 2.40
+ */
+void
+g_notification_set_urgent (GNotification *notification,
+                           gboolean       urgent)
+{
+  g_return_if_fail (G_IS_NOTIFICATION (notification));
+
+  notification->urgent = urgent;
+}
+
+/**
+ * g_notification_add_button:
+ * @notification: a #GNotification
+ * @label: label of the button
+ * @detailed_action: a detailed action name
+ *
+ * Adds a button to @notification that activates the action in
+ * @detailed_action when clicked. That action must be an
+ * application-wide action (starting with "app."). If @detailed_action
+ * contains a target, the action will be activated with that target as
+ * its parameter.
+ *
+ * See g_action_parse_detailed_name() for a description of the format
+ * for @detailed_action.
+ *
+ * Since: 2.40
+ */
+void
+g_notification_add_button (GNotification *notification,
+                           const gchar   *label,
+                           const gchar   *detailed_action)
+{
+  gchar *action;
+  GVariant *target;
+  GError *error = NULL;
+
+  g_return_if_fail (detailed_action != NULL);
+
+  if (!g_action_parse_detailed_name (detailed_action, &action, &target, &error))
+    {
+      g_warning ("%s: %s", G_STRFUNC, error->message);
+      g_error_free (error);
+      return;
+    }
+
+  g_notification_add_button_with_target_value (notification, label, action, target);
+
+  g_free (action);
+  if (target)
+    g_variant_unref (target);
+}
+
+/**
+ * g_notification_add_button_with_target: (skip)
+ * @notification: a #GNotification
+ * @label: label of the button
+ * @action: an action name
+ * @target_format: (allow-none): a GVariant format string, or %NULL
+ * @...: positional parameters, as determined by @format_string
+ *
+ * Adds a button to @notification that activates @action when clicked.
+ * @action must be an application-wide action (it must start with "app.").
+ *
+ * If @target_format is given, it is used to collect remaining
+ * positional parameters into a GVariant instance, similar to
+ * g_variant_new(). @action will be activated with that GVariant as its
+ * parameter.
+ *
+ * Since: 2.40
+ */
+void
+g_notification_add_button_with_target (GNotification *notification,
+                                       const gchar   *label,
+                                       const gchar   *action,
+                                       const gchar   *target_format,
+                                       ...)
+{
+  va_list args;
+  GVariant *target = NULL;
+
+  if (target_format)
+    {
+      va_start (args, target_format);
+      target = g_variant_new_va (target_format, NULL, &args);
+      va_end (args);
+    }
+
+  g_notification_add_button_with_target_value (notification, label, action, target);
+}
+
+/**
+ * g_notification_add_button_with_target_value: (rename-to g_notification_add_button_with_target)
+ * @notification: a #GNotification
+ * @label: label of the button
+ * @action: an action name
+ * @target: (allow-none): a GVariant to use as @action's parameter, or %NULL
+ *
+ * Adds a button to @notification that activates @action when clicked.
+ * @action must be an application-wide action (it must start with "app.").
+ *
+ * If @target is non-%NULL, @action will be activated with @target as
+ * its parameter.
+ *
+ * Since: 2.40
+ */
+void
+g_notification_add_button_with_target_value (GNotification *notification,
+                                             const gchar   *label,
+                                             const gchar   *action,
+                                             GVariant      *target)
+{
+  Button *button;
+
+  g_return_if_fail (G_IS_NOTIFICATION (notification));
+  g_return_if_fail (label != NULL);
+  g_return_if_fail (action != NULL && g_action_name_is_valid (action));
+
+  if (!g_str_has_prefix (action, "app."))
+    {
+      g_warning ("%s: action '%s' does not start with 'app.'."
+                 "This is unlikely to work properly.", G_STRFUNC, action);
+    }
+
+  button =  g_slice_new0 (Button);
+  button->label = g_strdup (label);
+  button->action_name = g_strdup (action);
+
+  if (target)
+    button->target = g_variant_ref_sink (target);
+
+  g_ptr_array_add (notification->buttons, button);
+}
+
+/*< private >
+ * g_notification_get_n_buttons:
+ * @notification: a #GNotification
+ *
+ * Returns: the amount of buttons added to @notification.
+ */
+guint
+g_notification_get_n_buttons (GNotification *notification)
+{
+  return notification->buttons->len;
+}
+
+/*< private >
+ * g_notification_get_button:
+ * @notification: a #GNotification
+ * @index: index of the button
+ * @label: (): return location for the button's label
+ * @action: (): return location for the button's associated action
+ * @target: (): return location for the target @action should be
+ * activated with
+ *
+ * Returns a description of a button that was added to @notification
+ * with g_notification_add_button().
+ *
+ * @index must be smaller than the value returned by
+ * g_notification_get_n_buttons().
+ */
+void
+g_notification_get_button (GNotification  *notification,
+                           gint            index,
+                           gchar         **label,
+                           gchar         **action,
+                           GVariant      **target)
+{
+  Button *button;
+
+  button = g_ptr_array_index (notification->buttons, index);
+
+  if (label)
+    *label = g_strdup (button->label);
+
+  if (action)
+    *action = g_strdup (button->action_name);
+
+  if (target)
+    *target = button->target ? g_variant_ref (button->target) : NULL;
+}
+
+/*< private >
+ * g_notification_get_button_with_action:
+ * @notification: a #GNotification
+ * @action: an action name
+ *
+ * Returns the index of the button in @notification that is associated
+ * with @action, or -1 if no such button exists.
+ */
+gint
+g_notification_get_button_with_action (GNotification *notification,
+                                       const gchar   *action)
+{
+  guint i;
+
+  for (i = 0; i < notification->buttons->len; i++)
+    {
+      Button *button;
+
+      button = g_ptr_array_index (notification->buttons, i);
+      if (g_str_equal (action, button->action_name))
+        return i;
+    }
+
+  return -1;
+}
+
+
+/*< private >
+ * g_notification_get_default_action:
+ * @notification: a #GNotification
+ * @action: (allow-none): return location for the default action
+ * @target: (allow-none): return location for the target of the default action
+ *
+ * Gets the action and target for the default action of @notification.
+ *
+ * Returns: %TRUE if @notification has a default action
+ */
+gboolean
+g_notification_get_default_action (GNotification  *notification,
+                                   gchar         **action,
+                                   GVariant      **target)
+{
+  if (notification->default_action == NULL)
+    return FALSE;
+
+  if (action)
+    *action = g_strdup (notification->default_action);
+
+  if (target)
+    {
+      if (notification->default_action_target)
+        *target = g_variant_ref (notification->default_action_target);
+      else
+        *target = NULL;
+    }
+
+  return TRUE;
+}
+
+/**
+ * g_notification_set_default_action:
+ * @notification: a #GNotification
+ * @detailed_action: a detailed action name
+ *
+ * Sets the default action of @notification to @detailed_action. This
+ * action is activated when the notification is clicked on.
+ *
+ * The action in @detailed_action must be an application-wide action (it
+ * must start with "app."). If @detailed_action contains a target, the
+ * given action will be activated with that target as its parameter.
+ * See g_action_parse_detailed_name() for a description of the format
+ * for @detailed_action.
+ *
+ * When no default action is set, the application that the notification
+ * was sent on is activated.
+ *
+ * Since: 2.40
+ */
+void
+g_notification_set_default_action (GNotification *notification,
+                                   const gchar   *detailed_action)
+{
+  gchar *action;
+  GVariant *target;
+  GError *error = NULL;
+
+  if (!g_action_parse_detailed_name (detailed_action, &action, &target, &error))
+    {
+      g_warning ("%s: %s", G_STRFUNC, error->message);
+      g_error_free (error);
+      return;
+    }
+
+  g_notification_set_default_action_and_target_value (notification, action, target);
+
+  g_free (action);
+  if (target)
+    g_variant_unref (target);
+}
+
+/**
+ * g_notification_set_default_action_and_target: (skip)
+ * @notification: a #GNotification
+ * @action: an action name
+ * @target_format: (allow-none): a GVariant format string, or %NULL
+ * @...: positional parameters, as determined by @format_string
+ *
+ * Sets the default action of @notification to @action. This action is
+ * activated when the notification is clicked on. It must be an
+ * application-wide action (it must start with "app.").
+ *
+ * If @target_format is given, it is used to collect remaining
+ * positional parameters into a GVariant instance, similar to
+ * g_variant_new(). @action will be activated with that GVariant as its
+ * parameter.
+ *
+ * When no default action is set, the application that the notification
+ * was sent on is activated.
+ *
+ * Since: 2.40
+ */
+void
+g_notification_set_default_action_and_target (GNotification *notification,
+                                              const gchar   *action,
+                                              const gchar   *target_format,
+                                              ...)
+{
+  va_list args;
+  GVariant *target = NULL;
+
+  if (target_format)
+    {
+      va_start (args, target_format);
+      target = g_variant_new_va (target_format, NULL, &args);
+      va_end (args);
+    }
+
+  g_notification_set_default_action_and_target_value (notification, action, target);
+}
+
+/**
+ * g_notification_set_default_action_and_target_value: (rename-to 
g_notification_set_default_action_and_target)
+ * @notification: a #GNotification
+ * @action: an action name
+ * @target: (allow-none): a GVariant to use as @action's parameter, or %NULL
+ *
+ * Sets the default action of @notification to @action. This action is
+ * activated when the notification is clicked on. It must be an
+ * application-wide action (start with "app.").
+ *
+ * If @target_format is given, it is used to collect remaining
+ * positional parameters into a GVariant instance, similar to
+ * g_variant_new().
+ *
+ * If @target is non-%NULL, @action will be activated with @target as
+ * its parameter.
+ *
+ * When no default action is set, the application that the notification
+ * was sent on is activated.
+ *
+ * Since: 2.40
+ */
+void
+g_notification_set_default_action_and_target_value (GNotification *notification,
+                                                    const gchar   *action,
+                                                    GVariant      *target)
+{
+  g_return_if_fail (G_IS_NOTIFICATION (notification));
+  g_return_if_fail (action != NULL && g_action_name_is_valid (action));
+
+  if (!g_str_has_prefix (action, "app."))
+    {
+      g_warning ("%s: action '%s' does not start with 'app.'."
+                 "This is unlikely to work properly.", G_STRFUNC, action);
+    }
+
+  g_free (notification->default_action);
+  g_clear_pointer (&notification->default_action_target, g_variant_unref);
+
+  notification->default_action = g_strdup (action);
+
+  if (target)
+    notification->default_action_target = g_variant_ref_sink (target);
+}
diff --git a/gio/gnotification.h b/gio/gnotification.h
new file mode 100644
index 0000000..652d7dd
--- /dev/null
+++ b/gio/gnotification.h
@@ -0,0 +1,94 @@
+/*
+ * Copyright © 2013 Lars Uebernickel
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General
+ * Public License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place, Suite 330,
+ * Boston, MA 02111-1307, USA.
+ *
+ * Authors: Lars Uebernickel <lars uebernic de>
+ */
+
+#ifndef __G_NOTIFICATION_H__
+#define __G_NOTIFICATION_H__
+
+#if !defined (__GIO_GIO_H_INSIDE__) && !defined (GIO_COMPILATION)
+#error "Only <gio/gio.h> can be included directly."
+#endif
+
+#include <gio/giotypes.h>
+
+G_BEGIN_DECLS
+
+#define G_TYPE_NOTIFICATION         (g_notification_get_type ())
+#define G_NOTIFICATION(o)           (G_TYPE_CHECK_INSTANCE_CAST ((o), G_TYPE_NOTIFICATION, GNotification))
+#define G_IS_NOTIFICATION(o)        (G_TYPE_CHECK_INSTANCE_TYPE ((o), G_TYPE_NOTIFICATION))
+
+GLIB_AVAILABLE_IN_2_40
+GType                   g_notification_get_type                         (void) G_GNUC_CONST;
+
+GLIB_AVAILABLE_IN_2_40
+GNotification *         g_notification_new                              (const gchar *title);
+
+GLIB_AVAILABLE_IN_2_40
+void                    g_notification_set_title                        (GNotification *notification,
+                                                                         const gchar   *title);
+
+GLIB_AVAILABLE_IN_2_40
+void                    g_notification_set_body                         (GNotification *notification,
+                                                                         const gchar   *body);
+
+GLIB_AVAILABLE_IN_2_40
+void                    g_notification_set_image                        (GNotification *notification,
+                                                                         GIcon         *image);
+
+GLIB_AVAILABLE_IN_2_40
+void                    g_notification_set_urgent                       (GNotification *notification,
+                                                                         gboolean       urgent);
+
+GLIB_AVAILABLE_IN_2_40
+void                    g_notification_add_button                       (GNotification *notification,
+                                                                         const gchar   *label,
+                                                                         const gchar   *detailed_action);
+
+GLIB_AVAILABLE_IN_2_40
+void                    g_notification_add_button_with_target           (GNotification *notification,
+                                                                         const gchar   *label,
+                                                                         const gchar   *action,
+                                                                         const gchar   *target_format,
+                                                                         ...);
+
+GLIB_AVAILABLE_IN_2_40
+void                    g_notification_add_button_with_target_value     (GNotification *notification,
+                                                                         const gchar   *label,
+                                                                         const gchar   *action,
+                                                                         GVariant      *target);
+
+GLIB_AVAILABLE_IN_2_40
+void                    g_notification_set_default_action               (GNotification *notification,
+                                                                         const gchar   *detailed_action);
+
+GLIB_AVAILABLE_IN_2_40
+void                    g_notification_set_default_action_and_target    (GNotification *notification,
+                                                                         const gchar   *action,
+                                                                         const gchar   *target_format,
+                                                                         ...);
+
+GLIB_AVAILABLE_IN_2_40
+void                 g_notification_set_default_action_and_target_value (GNotification *notification,
+                                                                         const gchar   *action,
+                                                                         GVariant      *target);
+
+G_END_DECLS
+
+#endif
diff --git a/gio/gnotificationbackend.c b/gio/gnotificationbackend.c
new file mode 100644
index 0000000..d5ced9c
--- /dev/null
+++ b/gio/gnotificationbackend.c
@@ -0,0 +1,112 @@
+/*
+ * Copyright © 2013 Lars Uebernickel
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published
+ * by the Free Software Foundation; either version 2 of the licence or (at
+ * your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General
+ * Public License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place, Suite 330,
+ * Boston, MA 02111-1307, USA.
+ *
+ * Authors: Lars Uebernickel <lars uebernic de>
+ */
+
+#include "gnotificationbackend.h"
+
+#include "gnotification.h"
+#include "gapplication.h"
+#include "gactiongroup.h"
+#include "giomodule-priv.h"
+
+G_DEFINE_TYPE (GNotificationBackend, g_notification_backend, G_TYPE_OBJECT);
+
+static void
+g_notification_backend_class_init (GNotificationBackendClass *class)
+{
+}
+
+static void
+g_notification_backend_init (GNotificationBackend *backend)
+{
+}
+
+GNotificationBackend *
+g_notification_backend_new_default (GApplication *application)
+{
+  GType backend_type;
+  GNotificationBackend *backend;
+
+  g_return_val_if_fail (G_IS_APPLICATION (application), NULL);
+
+  backend_type = _g_io_module_get_default_type (G_NOTIFICATION_BACKEND_EXTENSION_POINT_NAME,
+                                                "GNOTIFICATION_BACKEND",
+                                                G_STRUCT_OFFSET (GNotificationBackendClass, is_supported));
+
+  backend = g_object_new (backend_type, NULL);
+
+  /* Avoid ref cycle by not taking a ref to the application at all. The
+   * backend only lives as long as the application does.
+   */
+  backend->application = application;
+
+  backend->dbus_connection = g_object_ref (g_application_get_dbus_connection (application));
+
+  return backend;
+}
+
+void
+g_notification_backend_send_notification (GNotificationBackend *backend,
+                                          const gchar          *id,
+                                          GNotification        *notification)
+{
+  g_return_if_fail (G_IS_NOTIFICATION_BACKEND (backend));
+  g_return_if_fail (G_IS_NOTIFICATION (notification));
+
+  G_NOTIFICATION_BACKEND_GET_CLASS (backend)->send_notification (backend, id, notification);
+}
+
+void
+g_notification_backend_withdraw_notification (GNotificationBackend *backend,
+                                              const gchar          *id)
+{
+  g_return_if_fail (G_IS_NOTIFICATION_BACKEND (backend));
+  g_return_if_fail (id != NULL);
+
+  G_NOTIFICATION_BACKEND_GET_CLASS (backend)->withdraw_notification (backend, id);
+}
+
+GApplication *
+g_notification_backend_get_application (GNotificationBackend *backend)
+{
+  g_return_val_if_fail (G_IS_NOTIFICATION_BACKEND (backend), NULL);
+
+  return backend->application;
+}
+
+void
+g_notification_backend_activate_action (GNotificationBackend *backend,
+                                        const gchar          *name,
+                                        GVariant             *parameter)
+{
+  g_return_if_fail (G_IS_NOTIFICATION_BACKEND (backend));
+  g_return_if_fail (name != NULL);
+
+  if (g_str_has_prefix (name, "app."))
+    g_action_group_activate_action (G_ACTION_GROUP (backend->application), name + 4, parameter);
+}
+
+GDBusConnection *
+g_notification_backend_get_dbus_connection (GNotificationBackend *backend)
+{
+  g_return_val_if_fail (G_IS_NOTIFICATION_BACKEND (backend), NULL);
+
+  return backend->dbus_connection;
+}
diff --git a/gio/gnotificationbackend.h b/gio/gnotificationbackend.h
new file mode 100644
index 0000000..508e428
--- /dev/null
+++ b/gio/gnotificationbackend.h
@@ -0,0 +1,83 @@
+/*
+ * Copyright © 2013 Lars Uebernickel
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published
+ * by the Free Software Foundation; either version 2 of the licence or (at
+ * your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General
+ * Public License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place, Suite 330,
+ * Boston, MA 02111-1307, USA.
+ *
+ * Authors: Lars Uebernickel <lars uebernic de>
+ */
+
+#ifndef __G_NOTIFICATION_BACKEND_H__
+#define __G_NOTIFICATION_BACKEND_H__
+
+#include <gio/giotypes.h>
+
+G_BEGIN_DECLS
+
+#define G_TYPE_NOTIFICATION_BACKEND         (g_notification_backend_get_type ())
+#define G_NOTIFICATION_BACKEND(o)           (G_TYPE_CHECK_INSTANCE_CAST ((o), G_TYPE_NOTIFICATION_BACKEND, 
GNotificationBackend))
+#define G_IS_NOTIFICATION_BACKEND(o)        (G_TYPE_CHECK_INSTANCE_TYPE ((o), G_TYPE_NOTIFICATION_BACKEND))
+#define G_NOTIFICATION_BACKEND_CLASS(k)     (G_TYPE_CHECK_CLASS_CAST ((k), G_TYPE_NOTIFICATION_BACKEND, 
GNotificationBackendClass))
+#define G_NOTIFICATION_BACKEND_GET_CLASS(o) (G_TYPE_INSTANCE_GET_CLASS ((o), G_TYPE_NOTIFICATION_BACKEND, 
GNotificationBackendClass))
+
+#define G_NOTIFICATION_BACKEND_EXTENSION_POINT_NAME "gnotification-backend"
+
+typedef struct _GNotificationBackend      GNotificationBackend;
+typedef struct _GNotificationBackendClass GNotificationBackendClass;
+
+struct _GNotificationBackend
+{
+  GObject parent_instance;
+
+  GApplication    *application;
+  GDBusConnection *dbus_connection;
+};
+
+struct _GNotificationBackendClass
+{
+  GObjectClass parent_class;
+
+  gboolean  (*is_supported)             (void);
+
+  void      (*send_notification)        (GNotificationBackend *backend,
+                                         const gchar          *id,
+                                         GNotification        *notification);
+
+  void      (*withdraw_notification)    (GNotificationBackend *backend,
+                                         const gchar          *id);
+};
+
+GType                   g_notification_backend_get_type                 (void);
+
+GNotificationBackend *  g_notification_backend_new_default              (GApplication         *application);
+
+void                    g_notification_backend_send_notification        (GNotificationBackend *backend,
+                                                                         const gchar          *id,
+                                                                         GNotification        *notification);
+
+void                    g_notification_backend_withdraw_notification    (GNotificationBackend *backend,
+                                                                         const gchar          *id);
+
+GApplication *          g_notification_backend_get_application          (GNotificationBackend *backend);
+
+void                    g_notification_backend_activate_action          (GNotificationBackend *backend,
+                                                                         const gchar          *name,
+                                                                         GVariant             *parameter);
+
+GDBusConnection *       g_notification_backend_get_dbus_connection      (GNotificationBackend *backend);
+
+G_END_DECLS
+
+#endif


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