--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/plugins/plugin_xep_0334.py	Thu Dec 25 12:09:05 2014 +0100
@@ -0,0 +1,111 @@
+#!/usr/bin/python
+# -*- coding: utf-8 -*-
+
+# SAT plugin for Delayed Delivery (XEP-0334)
+# Copyright (C) 2009, 2010, 2011, 2012, 2013, 2014 Jérôme Poisson (goffi@goffi.org)
+# Copyright (C) 2013, 2014 Adrien Cossa (souliane@mailoo.org)
+
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+
+# This program 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 Affero General Public License for more details.
+
+# You should have received a copy of the GNU Affero General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+from sat.core.i18n import _
+from sat.core.log import getLogger
+log = getLogger(__name__)
+
+from sat.core import exceptions
+
+from wokkel import disco, iwokkel
+try:
+    from twisted.words.protocols.xmlstream import XMPPHandler
+except ImportError:
+    from wokkel.subprotocols import XMPPHandler
+from twisted.python import failure
+from zope.interface import implements
+
+
+NS_MPH = 'urn:xmpp:hints'
+
+PLUGIN_INFO = {
+    "name": "Message Processing Hints",
+    "import_name": "XEP-0334",
+    "type": "XEP",
+    "protocols": ["XEP-0334"],
+    "main": "XEP_0334",
+    "handler": "yes",
+    "description": _("""Implementation of Message Processing Hints""")
+}
+
+
+class XEP_0334(object):
+
+    def __init__(self, host):
+        log.info(_("Message Processing Hints plugin initialization"))
+        self.host = host
+        host.trigger.add("sendMessage", self.sendMessageTrigger)
+        host.trigger.add("MessageReceived", self.messageReceivedTrigger)
+
+    def getHandler(self, profile):
+        return XEP_0334_handler(self, profile)
+
+    def sendMessageTrigger(self, mess_data, pre_xml_treatments, post_xml_treatments, profile):
+        """Add the hints element to the message to be sent"""
+        hints = []
+        for key in ('no-permanent-storage', 'no-storage', 'no-copy'):
+            if mess_data['extra'].get(key, None):
+                hints.append(key)
+
+        def treatment(mess_data):
+            message = mess_data['xml']
+            for key in hints:
+                message.addElement((NS_MPH, key))
+                if key in ('no-permanent-storage', 'no-storage'):
+                    mess_data['extra']['no_storage'] = True
+                    # TODO: the core doesn't process this 'no_storage' info yet
+                    # it will be added after the frontends refactorization
+            return mess_data
+
+        if hints:
+            post_xml_treatments.addCallback(treatment)
+        return True
+
+    def messageReceivedTrigger(self, message, post_treat, profile):
+        """Check for hints in the received message"""
+        hints = []
+        for key in ('no-permanent-storage', 'no-storage'):
+            try:
+                message.elements(uri=NS_MPH, name=key).next()
+                hints.append(key)
+            except StopIteration:
+                pass
+
+        def post_treat_hints(data):
+            raise failure.Failure(exceptions.SkipHistory())
+
+        if hints:
+            post_treat.addCallback(post_treat_hints)
+        return True
+
+
+class XEP_0334_handler(XMPPHandler):
+    implements(iwokkel.IDisco)
+
+    def __init__(self, plugin_parent, profile):
+        self.plugin_parent = plugin_parent
+        self.host = plugin_parent.host
+        self.profile = profile
+
+    def getDiscoInfo(self, requestor, target, nodeIdentifier=''):
+        return [disco.DiscoFeature(NS_MPH)]
+
+    def getDiscoItems(self, requestor, target, nodeIdentifier=''):
+        return []