Added XEP-0203 Delayed Delivery plugin.

sleekxmpp/plugins/xep_0203/delay.py

@@ -0,0 +1,36 @@
+"""
+    SleekXMPP: The Sleek XMPP Library
+    Copyright (C) 2011 Nathanael C. Fritz, Lance J.T. Stout
+    This file is part of SleekXMPP.
+
+    See the file LICENSE for copying permission.
+"""
+
+
+from sleekxmpp.stanza import Message, Presence
+from sleekxmpp.xmlstream import register_stanza_plugin
+from sleekxmpp.plugins.base import base_plugin
+from sleekxmpp.plugins.xep_0203 import stanza
+
+
+class xep_0203(base_plugin):
+
+    """
+    XEP-0203: Delayed Delivery
+
+    XMPP stanzas are sometimes withheld for delivery due to the recipient
+    being offline, or are resent in order to establish recent history as
+    is the case with MUCS. In any case, it is important to know when the
+    stanza was originally sent, not just when it was last received.
+
+    Also see <http://www.xmpp.org/extensions/xep-0203.html>.
+    """
+
+    def plugin_init(self):
+        """Start the XEP-0203 plugin."""
+        self.xep = '0203'
+        self.description = 'Delayed Delivery'
+        self.stanza = stanza
+
+        register_stanza_plugin(Message, stanza.Delay)
+        register_stanza_plugin(Presence, stanza.Delay)