Allow non-guests to peek on rooms using /events

1 files changed, 46 insertions, 47 deletions

diff --git a/synapse/handlers/message.py b/synapse/handlers/message.py
index 4c7bf2bef3..ff800f8af1 100644
--- a/synapse/handlers/message.py
+++ b/synapse/handlers/message.py
@@ -78,21 +78,20 @@ class MessageHandler(BaseHandler):
         defer.returnValue(None)
 
     @defer.inlineCallbacks
-    def get_messages(self, user_id=None, room_id=None, pagin_config=None,
-                     as_client_event=True, is_guest=False):
+    def get_messages(self, requester, room_id=None, pagin_config=None,
+                     as_client_event=True):
         """Get messages in a room.
 
         Args:
-            user_id (str): The user requesting messages.
+            requester (Requester): The user requesting messages.
             room_id (str): The room they want messages from.
             pagin_config (synapse.api.streams.PaginationConfig): The pagination
                 config rules to apply, if any.
             as_client_event (bool): True to get events in client-server format.
-            is_guest (bool): Whether the requesting user is a guest (as opposed
-                to a fully registered user).
         Returns:
             dict: Pagination API results
         """
+        user_id = requester.user.to_string()
         data_source = self.hs.get_event_sources().sources["room"]
 
         if pagin_config.from_token:
@@ -115,36 +114,33 @@ class MessageHandler(BaseHandler):
 
         source_config = pagin_config.get_source_config("room")
 
-        if not is_guest:
-            member_event = yield self.auth.check_user_was_in_room(room_id, user_id)
-            if member_event.membership == Membership.LEAVE:
-                # If they have left the room then clamp the token to be before
-                # they left the room.
-                # If they're a guest, we'll just 403 them if they're asking for
-                # events they can't see.
-                leave_token = yield self.store.get_topological_token_for_event(
-                    member_event.event_id
-                )
-                leave_token = RoomStreamToken.parse(leave_token)
-                if leave_token.topological < room_token.topological:
-                    source_config.from_key = str(leave_token)
-
-                if source_config.direction == "f":
-                    if source_config.to_key is None:
+        membership, member_event_id = yield self._check_in_room_or_world_readable(
+            room_id, user_id
+        )
+        if membership == Membership.LEAVE:
+            # If they have left the room then clamp the token to be before
+            # they left the room.
+            leave_token = yield self.store.get_topological_token_for_event(
+                member_event_id
+            )
+            leave_token = RoomStreamToken.parse(leave_token)
+            if leave_token.topological < room_token.topological:
+                source_config.from_key = str(leave_token)
+
+            if source_config.direction == "f":
+                if source_config.to_key is None:
+                    source_config.to_key = str(leave_token)
+                else:
+                    to_token = RoomStreamToken.parse(source_config.to_key)
+                    if leave_token.topological < to_token.topological:
                         source_config.to_key = str(leave_token)
-                    else:
-                        to_token = RoomStreamToken.parse(source_config.to_key)
-                        if leave_token.topological < to_token.topological:
-                            source_config.to_key = str(leave_token)
 
         yield self.hs.get_handlers().federation_handler.maybe_backfill(
             room_id, room_token.topological
         )
 
-        user = UserID.from_string(user_id)
-
         events, next_key = yield data_source.get_pagination_rows(
-            user, source_config, room_id
+            requester.user, source_config, room_id
         )
 
         next_token = pagin_config.from_token.copy_and_replace(
@@ -158,7 +154,11 @@ class MessageHandler(BaseHandler):
                 "end": next_token.to_string(),
             })
 
-        events = yield self._filter_events_for_client(user_id, events, is_guest=is_guest)
+        events = yield self._filter_events_for_client(
+            user_id,
+            events,
+            is_peeking=(member_event_id is None),
+        )
 
         time_now = self.clock.time_msec()
 
@@ -289,7 +289,7 @@ class MessageHandler(BaseHandler):
             SynapseError if something went wrong.
         """
         membership, membership_event_id = yield self._check_in_room_or_world_readable(
-            room_id, user_id, is_guest
+            room_id, user_id
         )
 
         if membership == Membership.JOIN:
@@ -306,7 +306,7 @@ class MessageHandler(BaseHandler):
         defer.returnValue(data)
 
     @defer.inlineCallbacks
-    def _check_in_room_or_world_readable(self, room_id, user_id, is_guest):
+    def _check_in_room_or_world_readable(self, room_id, user_id):
         try:
             # check_user_was_in_room will return the most recent membership
             # event for the user if:
@@ -316,7 +316,7 @@ class MessageHandler(BaseHandler):
             member_event = yield self.auth.check_user_was_in_room(room_id, user_id)
             defer.returnValue((member_event.membership, member_event.event_id))
             return
-        except AuthError, auth_error:
+        except AuthError:
             visibility = yield self.state_handler.get_current_state(
                 room_id, EventTypes.RoomHistoryVisibility, ""
             )
@@ -326,8 +326,6 @@ class MessageHandler(BaseHandler):
             ):
                 defer.returnValue((Membership.JOIN, None))
                 return
-            if not is_guest:
-                raise auth_error
             raise AuthError(
                 403, "Guest access not allowed", errcode=Codes.GUEST_ACCESS_FORBIDDEN
             )
@@ -345,7 +343,7 @@ class MessageHandler(BaseHandler):
             A list of dicts representing state events. [{}, {}, {}]
         """
         membership, membership_event_id = yield self._check_in_room_or_world_readable(
-            room_id, user_id, is_guest
+            room_id, user_id
         )
 
         if membership == Membership.JOIN:
@@ -556,13 +554,13 @@ class MessageHandler(BaseHandler):
         defer.returnValue(ret)
 
     @defer.inlineCallbacks
-    def room_initial_sync(self, user_id, room_id, pagin_config=None, is_guest=False):
+    def room_initial_sync(self, requester, room_id, pagin_config=None):
         """Capture the a snapshot of a room. If user is currently a member of
         the room this will be what is currently in the room. If the user left
         the room this will be what was in the room when they left.
 
         Args:
-            user_id(str): The user to get a snapshot for.
+            requester(Requester): The user to get a snapshot for.
             room_id(str): The room to get a snapshot of.
             pagin_config(synapse.streams.config.PaginationConfig):
                 The pagination config used to determine how many messages to
@@ -573,19 +571,20 @@ class MessageHandler(BaseHandler):
             A JSON serialisable dict with the snapshot of the room.
         """
 
+        user_id = requester.user.to_string()
+
         membership, member_event_id = yield self._check_in_room_or_world_readable(
-            room_id,
-            user_id,
-            is_guest
+            room_id, user_id,
         )
+        is_peeking = member_event_id is None
 
         if membership == Membership.JOIN:
             result = yield self._room_initial_sync_joined(
-                user_id, room_id, pagin_config, membership, is_guest
+                user_id, room_id, pagin_config, membership, is_peeking
             )
         elif membership == Membership.LEAVE:
             result = yield self._room_initial_sync_parted(
-                user_id, room_id, pagin_config, membership, member_event_id, is_guest
+                user_id, room_id, pagin_config, membership, member_event_id, is_peeking
             )
 
         account_data_events = []
@@ -609,7 +608,7 @@ class MessageHandler(BaseHandler):
 
     @defer.inlineCallbacks
     def _room_initial_sync_parted(self, user_id, room_id, pagin_config,
-                                  membership, member_event_id, is_guest):
+                                  membership, member_event_id, is_peeking):
         room_state = yield self.store.get_state_for_events(
             [member_event_id], None
         )
@@ -631,7 +630,7 @@ class MessageHandler(BaseHandler):
         )
 
         messages = yield self._filter_events_for_client(
-            user_id, messages, is_guest=is_guest
+            user_id, messages, is_peeking=is_peeking
         )
 
         start_token = StreamToken(token[0], 0, 0, 0, 0)
@@ -654,7 +653,7 @@ class MessageHandler(BaseHandler):
 
     @defer.inlineCallbacks
     def _room_initial_sync_joined(self, user_id, room_id, pagin_config,
-                                  membership, is_guest):
+                                  membership, is_peeking):
         current_state = yield self.state.get_current_state(
             room_id=room_id,
         )
@@ -718,7 +717,7 @@ class MessageHandler(BaseHandler):
         ).addErrback(unwrapFirstError)
 
         messages = yield self._filter_events_for_client(
-            user_id, messages, is_guest=is_guest,
+            user_id, messages, is_peeking=is_peeking,
         )
 
         start_token = now_token.copy_and_replace("room_key", token[0])
@@ -737,7 +736,7 @@ class MessageHandler(BaseHandler):
             "presence": presence,
             "receipts": receipts,
         }
-        if not is_guest:
+        if not is_peeking:
             ret["membership"] = membership
 
         defer.returnValue(ret)