Add new event type for OTR modifications

hangups/__init__.py

@@ -9,7 +9,7 @@
 from .auth import get_auth, get_auth_stdin, GoogleAuthError
 from .exceptions import HangupsError, NetworkError
 from .conversation_event import (ChatMessageSegment, ConversationEvent,
-                                 ChatMessageEvent, RenameEvent,
+                                 ChatMessageEvent, OTREvent, RenameEvent,
                                  MembershipChangeEvent, HangoutEvent,
                                  GroupLinkSharingModificationEvent)
 # Only import Protocol Buffer objects that are needed for the high-level

hangups/conversation.py

@@ -166,6 +166,8 @@ def _wrap_event(event_):
         """Wrap hangouts_pb2.Event in ConversationEvent subclass."""
         if event_.HasField('chat_message'):
             return conversation_event.ChatMessageEvent(event_)
+        elif event_.HasField('otr_modification'):
+            return conversation_event.OTREvent(event_)
         elif event_.HasField('conversation_rename'):
             return conversation_event.RenameEvent(event_)
         elif event_.HasField('membership_change'):

hangups/conversation_event.py

@@ -164,6 +164,24 @@ def attachments(self):
         return attachments
 
 
+class OTREvent(ConversationEvent):
+
+    """An event that changes OTR mode.
+
+    Corresponds to hangouts_pb2.OTRModification.
+    """
+
+    @property
+    def new_otr_status(self):
+        """The conversation's old OTR status."""
+        return self._event.otr_modification.new_otr_status
+
+    @property
+    def old_otr_status(self):
+        """The conversation's old OTR status."""
+        return self._event.otr_modification.old_otr_status
+
+
 class RenameEvent(ConversationEvent):
 
     """An event that renames a conversation.