[krb5-auth-dialog] Add simple DBUS signal listener example

[Guido Günther <guidog src gnome org>]

commit c374a7f8dbe6ef40c65752e3f35635d50d6b9260
Author: Guido Günther <agx sigxcpu org>
Date:   Fri Apr 2 16:39:37 2010 +0200

    Add simple DBUS signal listener example

 Makefile.am             |    2 +-
 configure.ac            |    1 +
 examples/Makefile.am    |    2 +
 examples/tgt-signals.py |   76 +++++++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 80 insertions(+), 1 deletions(-)
---
diff --git a/Makefile.am b/Makefile.am
index 6bbc2a7..c6adefb 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -1,6 +1,6 @@
 NULL = 
 
-SUBDIRS = secmem gtksecentry src po etpo icons preferences help
+SUBDIRS = secmem gtksecentry src po etpo icons preferences help examples
 
 EXTRA_DIST = \
 	krb5-auth-dialog.spec \
diff --git a/configure.ac b/configure.ac
index 0f9d81c..4a2e4bb 100644
--- a/configure.ac
+++ b/configure.ac
@@ -238,6 +238,7 @@ po/Makefile.in
 preferences/Makefile
 preferences/krb5-auth-dialog-preferences.1
 help/Makefile
+examples/Makefile
 ])
 
 AC_MSG_NOTICE([])
diff --git a/examples/Makefile.am b/examples/Makefile.am
new file mode 100644
index 0000000..ed8137b
--- /dev/null
+++ b/examples/Makefile.am
@@ -0,0 +1,2 @@
+EXTRA_DIST = \
+	tgt-signals.py
diff --git a/examples/tgt-signals.py b/examples/tgt-signals.py
new file mode 100644
index 0000000..613aa39
--- /dev/null
+++ b/examples/tgt-signals.py
@@ -0,0 +1,76 @@
+#!/usr/bin/python
+#
+# Copyright (C) 2010 Guido Guenther <agx sigxcpu org>
+#
+# 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 2.1 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
+"""Example on howto handle the different DBus signals emitted by
+   krb5-auth-dialog"""
+
+import datetime
+import time
+import subprocess
+from optparse import OptionParser
+
+import gobject
+import dbus
+import dbus.mainloop.glib
+
+def print_info(action, principal, when):
+    w = datetime.datetime.fromtimestamp(when)
+    if options.verbose:
+        print "Ticket %s. Principal %s expires %s" % (action, principal, time.asctime(w.timetuple()))
+
+def run_action(cmd):
+    if cmd:
+        subprocess.call(cmd, shell=True)
+
+def tgt_acquired_handler(principal, when):
+    print_info("acquired", principal, when)
+    run_action(options.acquired_action)
+
+def tgt_renewed_handler(principal, when):
+    print_info("renewed", principal, when)
+    run_action(options.renewed_action)
+
+def tgt_expired_handler(principal, when):
+    if options.verbose:
+        print "Principal %s expired" % principal
+    run_action(options.expired_action)
+
+if __name__ == '__main__':
+    global options
+
+    parser = OptionParser()
+    parser.add_option("--acquired-action", dest="acquired_action",
+                      help="action on ticket acquisition")
+    parser.add_option("--renewed-action", dest="renewed_action",
+                      help="action on ticket renewal")
+    parser.add_option("--expired-action", dest="expired_action",
+                      help="action on ticket expiration")
+    parser.add_option("-q", "--quiet",
+                      action="store_false", dest="verbose", default=True,
+                      help="don't print status messages to stdout")
+
+    (options, args) = parser.parse_args()
+
+    dbus.mainloop.glib.DBusGMainLoop(set_as_default=True)
+
+    bus = dbus.SessionBus()
+    bus.add_signal_receiver(tgt_renewed_handler, dbus_interface = "org.gnome.KrbAuthDialog", signal_name = "krb_tgt_renewed")
+    bus.add_signal_receiver(tgt_acquired_handler, dbus_interface = "org.gnome.KrbAuthDialog", signal_name = "krb_tgt_acquired")
+    bus.add_signal_receiver(tgt_expired_handler, dbus_interface = "org.gnome.KrbAuthDialog", signal_name = "krb_tgt_expired")
+
+    loop = gobject.MainLoop()
+    loop.run()