plugin XEP-0280: priority and "sent" fixes:

- carbon prioriy must be bigger than ones of encryption plugins, because the carbon copied messages must be unwrapped to be decrypted, this patch fixes it
- "sent" carbon elements was only stored and notified to frontends, it is now unwrapped and injected in normal traffic, this way other plugin can manage it, in particular encrypted elements can be decrypted

sat/plugins/plugin_xep_0280.py

@@ -75,7 +75,7 @@ class XEP_0280(object):
         log.info(_("Plugin XEP_0280 initialization"))
         self.host = host
         host.memory.updateParams(self.params)
-        host.trigger.add("MessageReceived", self.messageReceivedTrigger, priority=1000)
+        host.trigger.add("MessageReceived", self.messageReceivedTrigger, priority=200000)
 
     def getHandler(self, client):
         return XEP_0280_handler()
@@ -138,30 +138,26 @@ class XEP_0280(object):
             return
         forwarded_elt = next(carbons_elt.elements(C.NS_FORWARD, "forwarded"))
         cc_message_elt = next(forwarded_elt.elements(C.NS_CLIENT, "message"))
+
+        # we replace the wrapping message with the CCed one
+        # and continue the normal behaviour
         if carbons_elt.name == "received":
-            # on receive we replace the wrapping message with the CCed one
-            # and continue the normal behaviour
             message_elt["from"] = cc_message_elt["from"]
-            del message_elt.children[:]
-            for c in cc_message_elt.children:
-                message_elt.addChild(c)
-            return True
         elif carbons_elt.name == "sent":
-            # on sent we parse the message and just add it to history
-            # and send it to frontends (without normal sending treatments)
-            mess_data = client.messageProt.parseMessage(cc_message_elt)
-            if not mess_data["message"] and not mess_data["subject"]:
-                return False
-            client.messageAddToHistory(mess_data)
-            client.messageSendToBridge(mess_data)
+            message_elt["to"] = cc_message_elt["to"]
         else:
             log.warning(
                 u"invalid message carbons received:\n{xml}".format(
                     xml=message_elt.toXml()
                 )
             )
-        return False
+            return False
 
+        del message_elt.children[:]
+        for c in cc_message_elt.children:
+            message_elt.addChild(c)
+
+        return True
 
 class XEP_0280_handler(XMPPHandler):
     implements(iwokkel.IDisco)