Add XEP-0297: Stanza Forwarding support

sleekxmpp/plugins/xep_0297/stanza.py

@@ -0,0 +1,34 @@
+"""
+    SleekXMPP: The Sleek XMPP Library
+    Copyright (C) 2012 Nathanael C. Fritz, Lance J.T. Stout
+    This file is part of SleekXMPP.
+
+    See the file LICENSE for copying permission.
+"""
+
+from sleekxmpp.xmlstream import ElementBase
+
+
+class Forwarded(ElementBase):
+    name = 'forwarded'
+    namespace = 'urn:xmpp:forward:0'
+    plugin_attrib = 'forwarded'
+    interfaces = set(['stanza'])
+
+    def get_stanza(self):
+        if self.xml.find('{jabber:client}message') is not None:
+            return self['message']
+        elif self.xml.find('{jabber:client}presence') is not None:
+            return self['presence']
+        elif self.xml.find('{jabber:client}iq') is not None:
+            return self['iq']
+        return ''
+
+    def set_stanza(self, value):
+        self.del_stanza()
+        self.append(value)
+
+    def del_stanza(self):
+        del self['message']
+        del self['presence']
+        del self['iq']