--- a/src/plugins/plugin_exp_pubsub_hook.py	Sun Nov 19 16:46:07 2017 +0100
+++ b/src/plugins/plugin_exp_pubsub_hook.py	Sun Nov 19 16:51:39 2017 +0100
@@ -179,7 +179,7 @@
             - HOOK_TYPE_PYTHON_FILE: a python file
                 file must have a "hook" method which will be called
             - HOOK_TYPE_PYTHON_CODE: direct python code
-            /!\ Python hooks will be executed in SàT context,
+                /!\ Python hooks will be executed in SàT context,
                 with host, client and item as arguments, it means that:
                     - they can do whatever they wants, so don't run untrusted hooks
                     - they MUST NOT BLOCK, they are run in Twisted async environment and blocking would block whole SàT process

--- a/src/plugins/plugin_xep_0060.py	Sun Nov 19 16:46:07 2017 +0100
+++ b/src/plugins/plugin_xep_0060.py	Sun Nov 19 16:51:39 2017 +0100
@@ -92,8 +92,10 @@
         host.bridge.addMethod("psNodeAffiliationsSet", ".plugin", in_sign='ssa{ss}s', out_sign='', method=self._setNodeAffiliations, async=True)
         host.bridge.addMethod("psNodeSubscriptionsGet", ".plugin", in_sign='sss', out_sign='a{ss}', method=self._getNodeSubscriptions, async=True)
         host.bridge.addMethod("psNodeSubscriptionsSet", ".plugin", in_sign='ssa{ss}s', out_sign='', method=self._setNodeSubscriptions, async=True)
+        host.bridge.addMethod("psNodeDelete", ".plugin", in_sign='sss', out_sign='', method=self._deleteNode, async=True)
+        host.bridge.addMethod("psNodeWatchAdd", ".plugin", in_sign='sss', out_sign='', method=self._addWatch, async=False)
+        host.bridge.addMethod("psNodeWatchRemove", ".plugin", in_sign='sss', out_sign='', method=self._removeWatch, async=False)
         host.bridge.addMethod("psAffiliationsGet", ".plugin", in_sign='sss', out_sign='a{ss}', method=self._getAffiliations, async=True)
-        host.bridge.addMethod("psNodeDelete", ".plugin", in_sign='sss', out_sign='', method=self._deleteNode, async=True)
         host.bridge.addMethod("psItemsGet", ".plugin", in_sign='ssiassa{ss}s', out_sign='(asa{ss})', method=self._getItems, async=True)
         host.bridge.addMethod("psItemSend", ".plugin", in_sign='ssssa{ss}s', out_sign='s', method=self._sendItem, async=True)
         host.bridge.addMethod("psRetractItem", ".plugin", in_sign='sssbs', out_sign='', method=self._retractItem, async=True)
@@ -105,14 +107,20 @@
         host.bridge.addMethod("psGetSubscribeRTResult", ".plugin", in_sign='ss', out_sign='(ua(sss))', method=self._manySubscribeRTResult, async=True)
         host.bridge.addMethod("psGetFromMany", ".plugin", in_sign='a(ss)ia{ss}s', out_sign='s', method=self._getFromMany)
         host.bridge.addMethod("psGetFromManyRTResult", ".plugin", in_sign='ss', out_sign='(ua(sssasa{ss}))', method=self._getFromManyRTResult, async=True)
+
+        # high level observer method
         host.bridge.addSignal("psEvent", ".plugin", signature='ssssa{ss}s')  # args: category, service(jid), node, type (C.PS_ITEMS, C.PS_DELETE), data, profile
 
+        # low level observer method, used if service/node is in watching list (see psNodeWatch* methods)
+        host.bridge.addSignal("psEventRaw", ".plugin", signature='sssass')  # args: service(jid), node, type (C.PS_ITEMS, C.PS_DELETE), list of item_xml, profile
+
     def getHandler(self, client):
         client.pubsub_client = SatPubSubClient(self.host, self)
         return client.pubsub_client
 
     @defer.inlineCallbacks
     def profileConnected(self, client):
+        client.pubsub_watching = set()
         client.pubsub_service = yield self.host.findServiceEntity(client, "pubsub", "service")
 
     def getFeatures(self, profile):
@@ -577,6 +585,24 @@
     def deleteNode(self, client, service, nodeIdentifier):
         return client.pubsub_client.deleteNode(service, nodeIdentifier)
 
+    def _addWatch(self, service_s, node, profile_key):
+        """watch modifications on a node
+
+        This method should only be called from bridge
+        """
+        client = self.host.getClient(profile_key)
+        service = jid.JID(service_s) if service_s else client.jid.userhostJID()
+        client.pubsub_watching.add((service, node))
+
+    def _removeWatch(self, service_s, node, profile_key):
+        """remove a node watch
+
+        This method should only be called from bridge
+        """
+        client = self.host.getClient(profile_key)
+        service = jid.JID(service_s) if service_s else client.jid.userhostJID()
+        client.pubsub_watching.remove((service, node))
+
     def _retractItem(self, service_s, nodeIdentifier, itemIdentifier, notify, profile_key):
         return self._retractItems(service_s, nodeIdentifier, (itemIdentifier,), notify, profile_key)
 
@@ -897,11 +923,18 @@
         log.debug(u"Pubsub items received")
         for callback in self._getNodeCallbacks(event.nodeIdentifier, C.PS_ITEMS):
             callback(self.parent, event)
+        client = self.parent
+        if (event.sender, event.nodeIdentifier) in client.pubsub_watching:
+            raw_items = [i.toXml() for i in event.items]
+            self.host.bridge.psEventRaw(event.sender.full(), event.nodeIdentifier, C.PS_ITEMS, raw_items, client.profile)
 
     def deleteReceived(self, event):
         log.debug((u"Publish node deleted"))
         for callback in self._getNodeCallbacks(event.nodeIdentifier, C.PS_DELETE):
             callback(self.parent, event)
+        client = self.parent
+        if (event.sender, event.nodeIdentifier) in client.pubsub_watching:
+            self.host.bridge.psEventRaw(event.sender.full(), event.nodeIdentifier, C.PS_DELETE, [], client.profile)
 
     def subscriptions(self, service, nodeIdentifier, sender=None):
         """Return the list of subscriptions to the given service and node.