[omemo] Query devices if we have none

- PEP is not reliable enough for now, so we have to use this as
fallback

omemo/omemo_connection.py

@@ -121,7 +121,7 @@ class OMEMOConnection:
         log.debug('%s => Announce Support after Sign In', self.account)
         self.query_for_bundles = []
         self.publish_bundle()
-        self.query_own_devicelist()
+        self.query_devicelist()
 
     def activate(self):
         """ Method called when the Plugin is activated in the PluginManager
@@ -136,7 +136,7 @@ class OMEMOConnection:
                       self.account)
             self.query_for_bundles = []
             self.publish_bundle()
-            self.query_own_devicelist()
+            self.query_devicelist()
 
     def deactivate(self):
         """ Method called when the Plugin is deactivated in the PluginManager
@@ -518,16 +518,34 @@ class OMEMOConnection:
             bool
                 True if the given event was a valid device list update event
         """
-
         if event.conn.name != self.account:
             return
 
         if event.pep_type != 'omemo-devicelist':
-            return False
+            return
 
-        devices_list = list(set(unpack_device_list_update(event.stanza,
-                                                          event.conn.name)))
-        contact_jid = app.get_jid_without_resource(event.fjid)
+        self._handle_device_list_update(None, event.stanza)
+
+        # Dont propagate event further
+        return True
+
+    def _handle_device_list_update(self, conn, stanza, fetch_bundle=False):
+        """ Check if the passed event is a device list update and store the new
+            device ids.
+
+            Parameters
+            ----------
+            conn :          nbxmpp.NonBlockingClient
+
+            stanza:         nbxmpp.Iq
+
+            fetch_bundle:   If True, bundles are fetched for the device ids
+
+        """
+
+        devices_list = list(set(unpack_device_list_update(stanza,
+                                                          self.account)))
+        contact_jid = stanza.getFrom().getStripped()
         if not devices_list:
             log.error('%s => Received empty or invalid Devicelist from: %s',
                       self.account, contact_jid)
@@ -561,11 +579,11 @@ class OMEMOConnection:
             if contact_jid in self.query_for_bundles:
                 self.query_for_bundles.remove(contact_jid)
 
+            if fetch_bundle:
+                self.are_keys_missing(contact_jid)
             # Enable Encryption on receiving first Device List
             # TODO
 
-        return True
-
     def publish_own_devices_list(self, new=False):
         """ Get all currently known own active device ids and publish them
 
@@ -690,12 +708,19 @@ class OMEMOConnection:
             if ctrl:
                 self.plugin.new_fingerprints_available(ctrl)
 
-    def query_own_devicelist(self):
+    def query_devicelist(self, jid=None, fetch_bundle=False):
         """ Query own devicelist from the server """
-
-        device_query = DevicelistQuery(self.own_jid)
-        log.info('%s => Querry own devicelist ...', self.account)
-        self.send_with_callback(device_query, self.handle_devicelist_result)
+        if jid is None:
+            device_query = DevicelistQuery(self.own_jid)
+            log.info('%s => Querry own devicelist ...', self.account)
+            self.send_with_callback(device_query,
+                                    self.handle_devicelist_result)
+        else:
+            device_query = DevicelistQuery(jid)
+            log.info('%s => Querry devicelist from %s', self.account, jid)
+            self.send_with_callback(device_query,
+                                    self._handle_device_list_update,
+                                    data={'fetch_bundle': fetch_bundle})
 
     def publish_bundle(self):
         """ Publish our bundle information to the PEP node """

omemo/omemoplugin.py

@@ -23,6 +23,7 @@ the Gajim-OMEMO plugin.  If not, see <http://www.gnu.org/licenses/>.
 import logging
 import binascii
 import threading
+from enum import IntEnum, unique
 
 from gi.repository import GLib
 
@@ -73,6 +74,12 @@ if not ERROR_MSG:
 # pylint: disable=attribute-defined-outside-init
 
 
+@unique
+class UserMessages(IntEnum):
+    QUERY_DEVICES = 0
+    NO_FINGERPRINTS = 1
+
+
 class OmemoPlugin(GajimPlugin):
     def init(self):
         """ Init """
@@ -206,6 +213,7 @@ class OmemoPlugin(GajimPlugin):
     def before_sendmessage(self, chat_control):
         account = chat_control.account
         contact = chat_control.contact
+        con = self.connections[account]
         self.new_fingerprints_available(chat_control)
         if isinstance(chat_control, GroupchatControl):
             room = chat_control.room_jid
@@ -215,17 +223,24 @@ class OmemoPlugin(GajimPlugin):
                 real_jid = con.groupchat[room][nick]
                 if real_jid == own_jid:
                     continue
-                if not self.connections[account].are_keys_missing(real_jid):
+                if not con.are_keys_missing(real_jid):
                     missing = False
             if missing:
-                log.debug('%s => No Trusted Fingerprints for %s',
-                          account, room)
-                self.no_trusted_fingerprints_warning(chat_control)
+                log.info('%s => No Trusted Fingerprints for %s',
+                         account, room)
+                self.print_message(chat_control, UserMessages.NO_FINGERPRINTS)
         else:
-            if self.connections[account].are_keys_missing(contact.jid):
-                log.debug('%s => No Trusted Fingerprints for %s',
-                          account, contact.jid)
-                self.no_trusted_fingerprints_warning(chat_control)
+            # check if we have devices for the contact
+            if not self.get_omemo(account).device_list_for(contact.jid):
+                con.query_devicelist(contact.jid, True)
+                self.print_message(chat_control, UserMessages.QUERY_DEVICES)
+                chat_control.sendmessage = False
+                return
+            # check if bundles are missing for some devices
+            if con.are_keys_missing(contact.jid):
+                log.info('%s => No Trusted Fingerprints for %s',
+                         account, contact.jid)
+                self.print_message(chat_control, UserMessages.NO_FINGERPRINTS)
                 chat_control.sendmessage = False
             else:
                 log.debug('%s => Sending Message to %s',
@@ -277,7 +292,13 @@ class OmemoPlugin(GajimPlugin):
                 omemo.store.setShownFingerprints(fingerprints)
 
     @staticmethod
-    def no_trusted_fingerprints_warning(chat_control):
-        msg = "To send an encrypted message, you have to " \
-              "first trust the fingerprint of your contact!"
+    def print_message(chat_control, kind):
+        msg = None
+        if kind == UserMessages.QUERY_DEVICES:
+            msg = _('No devices found. Query in progress...')
+        elif kind == UserMessages.NO_FINGERPRINTS:
+            msg = _('To send an encrypted message, you have to '
+                    'first trust the fingerprint of your contact!')
+        if msg is None:
+            return
         chat_control.print_conversation_line(msg, 'status', '', None)

omemo/xmpp.py

@@ -140,7 +140,7 @@ class BundleInformationAnnouncement(Iq):
 
 
 class DevicelistQuery(Iq):
-    def __init__(self, contact_jid,):
+    def __init__(self, contact_jid):
         id_ = app.get_an_id()
         attrs = {'id': id_}
         Iq.__init__(self, typ='get', attrs=attrs, to=contact_jid)