Skip, rather than erroring, invalid guest requests

Erroring causes problems when people make illegal requests, because they
don't know what limit parameter they should pass.

This is definitely buggy. It leaks message counts for rooms people don't
have permission to see, via tokens. But apparently we already
consciously decided to allow that as a team, so this preserves that
behaviour.

synapse/handlers/_base.py

@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-# Copyright 2014, 2015 OpenMarket Ltd
+# Copyright 2014 - 2016 OpenMarket Ltd
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@@ -52,8 +52,7 @@ class BaseHandler(object):
         self.event_builder_factory = hs.get_event_builder_factory()
 
     @defer.inlineCallbacks
-    def _filter_events_for_client(self, user_id, events, is_guest=False,
-                                  require_all_visible_for_guests=True):
+    def _filter_events_for_client(self, user_id, events, is_guest=False):
         # Assumes that user has at some point joined the room if not is_guest.
 
         def allowed(event, membership, visibility):
@@ -114,17 +113,6 @@ class BaseHandler(object):
             if should_include:
                 events_to_return.append(event)
 
-        if (require_all_visible_for_guests
-                and is_guest
-                and len(events_to_return) < len(events)):
-            # This indicates that some events in the requested range were not
-            # visible to guest users. To be safe, we reject the entire request,
-            # so that we don't have to worry about interpreting visibility
-            # boundaries.
-            raise AuthError(403, "User %s does not have permission" % (
-                user_id
-            ))
-
         defer.returnValue(events_to_return)
 
     def ratelimit(self, user_id):

synapse/handlers/message.py

@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-# Copyright 2014, 2015 OpenMarket Ltd
+# Copyright 2014 - 2016 OpenMarket Ltd
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@@ -685,7 +685,7 @@ class MessageHandler(BaseHandler):
         ).addErrback(unwrapFirstError)
 
         messages = yield self._filter_events_for_client(
-            user_id, messages, is_guest=is_guest, require_all_visible_for_guests=False
+            user_id, messages, is_guest=is_guest,
         )
 
         start_token = now_token.copy_and_replace("room_key", token[0])

synapse/handlers/room.py

@@ -895,14 +895,12 @@ class RoomContextHandler(BaseHandler):
             user.to_string(),
             results["events_before"],
             is_guest=is_guest,
-            require_all_visible_for_guests=False
         )
 
         results["events_after"] = yield self._filter_events_for_client(
             user.to_string(),
             results["events_after"],
             is_guest=is_guest,
-            require_all_visible_for_guests=False
         )
 
         if results["events_after"]:

synapse/handlers/sync.py

@@ -648,7 +648,6 @@ class SyncHandler(BaseHandler):
                 sync_config.user.to_string(),
                 loaded_recents,
                 is_guest=sync_config.is_guest,
-                require_all_visible_for_guests=False
             )
             loaded_recents.extend(recents)
             recents = loaded_recents

synapse/notifier.py

@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-# Copyright 2014, 2015 OpenMarket Ltd
+# Copyright 2014 - 2016 OpenMarket Ltd
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@@ -386,7 +386,6 @@ class Notifier(object):
                         user.to_string(),
                         new_events,
                         is_guest=is_guest,
-                        require_all_visible_for_guests=False
                     )
 
                 events.extend(new_events)