[glib] gapplication: don't emit warnings for DBus calls

[Giovanni Campagna <gcampagna src gnome org>]

commit 415c6d2e2742946606c4db5b1157a946767afdb7
Author: Giovanni Campagna <gcampagna src gnome org>
Date:   Fri Oct 25 18:02:16 2013 +0200

    gapplication: don't emit warnings for DBus calls
    
    If a broken (or malicious) remote client calls Open or CommandLine
    on a GApplication that does not implement those, return a DBus
    error instead of going through and then emitting a warning.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=710885

 gio/gapplicationimpl-dbus.c |   16 ++++++++++++++++
 1 files changed, 16 insertions(+), 0 deletions(-)
---
diff --git a/gio/gapplicationimpl-dbus.c b/gio/gapplicationimpl-dbus.c
index 07709cc..2c77fee 100644
--- a/gio/gapplicationimpl-dbus.c
+++ b/gio/gapplicationimpl-dbus.c
@@ -203,12 +203,20 @@ g_application_impl_method_call (GDBusConnection       *connection,
 
   else if (strcmp (method_name, "Open") == 0)
     {
+      GApplicationFlags flags;
       GVariant *platform_data;
       const gchar *hint;
       GVariant *array;
       GFile **files;
       gint n, i;
 
+      flags = g_application_get_flags (impl->app);
+      if ((flags & G_APPLICATION_HANDLES_OPEN) == 0)
+        {
+          g_dbus_method_invocation_return_error (invocation, G_DBUS_ERROR, G_DBUS_ERROR_NOT_SUPPORTED, 
"Application does not open files");
+          return;
+        }
+
       /* freedesktop interface has no hint parameter */
       if (g_str_equal (interface_name, "org.freedesktop.Application"))
         {
@@ -246,10 +254,18 @@ g_application_impl_method_call (GDBusConnection       *connection,
 
   else if (strcmp (method_name, "CommandLine") == 0)
     {
+      GApplicationFlags flags;
       GApplicationCommandLine *cmdline;
       GVariant *platform_data;
       int status;
 
+      flags = g_application_get_flags (impl->app);
+      if ((flags & G_APPLICATION_HANDLES_COMMAND_LINE) == 0)
+        {
+          g_dbus_method_invocation_return_error (invocation, G_DBUS_ERROR, G_DBUS_ERROR_NOT_SUPPORTED, 
"Application does not handle command line arguments");
+          return;
+        }
+
       /* Only on the GtkApplication interface */
 
       cmdline = g_dbus_command_line_new (invocation);