D-Bus service providing org.gnome.ScreenSaver GetActive method for xsecurelock

org.gnome.ScreenSaver.py

#!/usr/bin/env python2

# /usr/share/dbus-1/scripts/org.gnome.ScreenSaver.py

import dbus
import dbus.mainloop.glib
import dbus.service
import gobject
import psutil

class ScreenSaver(dbus.service.Object):
  def __init__(self):
    self.session_bus = dbus.SessionBus()
    name = dbus.service.BusName("org.gnome.ScreenSaver", bus=self.session_bus)
    dbus.service.Object.__init__(self, name, "/")

  @dbus.service.method("org.gnome.ScreenSaver", in_signature='', out_signature='b')
  def GetActive(self):
    for pid in psutil.process_iter():
      if pid.name() == "xsecurelock":
        return True

    return False

if __name__ == '__main__':
  dbus.mainloop.glib.DBusGMainLoop(set_as_default=True)
  loop = gobject.MainLoop()
  object = ScreenSaver()
  loop.run()

org.gnome.ScreenSaver.service

# /usr/share/dbus-1/services/org.gnome.ScreenSaver.service

[D-BUS Service]
Name=org.gnome.ScreenSaver
Exec=/usr/share/dbus-1/scripts/org.gnome.ScreenSaver.py