Merge pull request #455 from matrix-org/markjh/guest_access

Allow guest access to /sync

4 files changed, 144 insertions, 50 deletions

diff --git a/synapse/api/errors.py b/synapse/api/errors.py
index d4037b3d55..8bc7b9e6db 100644
--- a/synapse/api/errors.py
+++ b/synapse/api/errors.py
@@ -120,6 +120,22 @@ class AuthError(SynapseError):
         super(AuthError, self).__init__(*args, **kwargs)
 
 
+class GuestAccessError(AuthError):
+    """An error raised when a there is a problem with a guest user accessing
+    a room"""
+
+    def __init__(self, rooms, *args, **kwargs):
+        self.rooms = rooms
+        super(GuestAccessError, self).__init__(*args, **kwargs)
+
+    def error_dict(self):
+        return cs_error(
+            self.msg,
+            self.errcode,
+            rooms=self.rooms,
+        )
+
+
 class EventSizeError(SynapseError):
     """An error raised when an event is too big."""
 
diff --git a/synapse/api/filtering.py b/synapse/api/filtering.py
index 4390d01e38..5287aaa757 100644
--- a/synapse/api/filtering.py
+++ b/synapse/api/filtering.py
@@ -149,6 +149,9 @@ class FilterCollection(object):
             "include_leave", False
         )
 
+    def list_rooms(self):
+        return self.room_filter.list_rooms()
+
     def timeline_limit(self):
         return self.room_timeline_filter.limit()
 
@@ -181,6 +184,15 @@ class Filter(object):
     def __init__(self, filter_json):
         self.filter_json = filter_json
 
+    def list_rooms(self):
+        """The list of room_id strings this filter restricts the output to
+        or None if the this filter doesn't list the room ids.
+        """
+        if "rooms" in self.filter_json:
+            return list(set(self.filter_json["rooms"]))
+        else:
+            return None
+
     def check(self, event):
         """Checks whether the filter matches the given event.
 
diff --git a/synapse/handlers/sync.py b/synapse/handlers/sync.py
index 7088c20cb4..feea407ea2 100644
--- a/synapse/handlers/sync.py
+++ b/synapse/handlers/sync.py
@@ -15,8 +15,8 @@
 
 from ._base import BaseHandler
 
-from synapse.streams.config import PaginationConfig
 from synapse.api.constants import Membership, EventTypes
+from synapse.api.errors import GuestAccessError
 from synapse.util import unwrapFirstError
 
 from twisted.internet import defer
@@ -29,6 +29,7 @@ logger = logging.getLogger(__name__)
 
 SyncConfig = collections.namedtuple("SyncConfig", [
     "user",
+    "is_guest",
     "filter",
 ])
 
@@ -117,6 +118,8 @@ class SyncResult(collections.namedtuple("SyncResult", [
             self.presence or self.joined or self.invited
         )
 
+GuestRoom = collections.namedtuple("GuestRoom", ("room_id", "membership"))
+
 
 class SyncHandler(BaseHandler):
 
@@ -135,6 +138,18 @@ class SyncHandler(BaseHandler):
             A Deferred SyncResult.
         """
 
+        if sync_config.is_guest:
+            bad_rooms = []
+            for room_id in sync_config.filter.list_rooms():
+                world_readable = yield self._is_world_readable(room_id)
+                if not world_readable:
+                    bad_rooms.append(room_id)
+
+            if bad_rooms:
+                raise GuestAccessError(
+                    bad_rooms, 403, "Guest access not allowed"
+                )
+
         if timeout == 0 or since_token is None or full_state:
             # we are going to return immediately, so don't bother calling
             # notifier.wait_for_events.
@@ -151,6 +166,17 @@ class SyncHandler(BaseHandler):
             )
             defer.returnValue(result)
 
+    @defer.inlineCallbacks
+    def _is_world_readable(self, room_id):
+        state = yield self.hs.get_state_handler().get_current_state(
+            room_id,
+            EventTypes.RoomHistoryVisibility
+        )
+        if state and "history_visibility" in state.content:
+            defer.returnValue(state.content["history_visibility"] == "world_readable")
+        else:
+            defer.returnValue(False)
+
     def current_sync_for_user(self, sync_config, since_token=None,
                               full_state=False):
         """Get the sync for client needed to match what the server has now.
@@ -174,37 +200,52 @@ class SyncHandler(BaseHandler):
         """
         now_token = yield self.event_sources.get_current_token()
 
-        now_token, ephemeral_by_room = yield self.ephemeral_by_room(
-            sync_config, now_token
-        )
+        if sync_config.is_guest:
+            room_list = [
+                GuestRoom(room_id, Membership.JOIN)
+                for room_id in sync_config.filter.list_rooms()
+            ]
 
-        presence_stream = self.event_sources.sources["presence"]
-        # TODO (mjark): This looks wrong, shouldn't we be getting the presence
-        # UP to the present rather than after the present?
-        pagination_config = PaginationConfig(from_token=now_token)
-        presence, _ = yield presence_stream.get_pagination_rows(
-            user=sync_config.user,
-            pagination_config=pagination_config.get_source_config("presence"),
-            key=None
-        )
+            account_data = {}
+            account_data_by_room = {}
+            tags_by_room = {}
 
-        membership_list = (Membership.INVITE, Membership.JOIN)
-        if sync_config.filter.include_leave:
-            membership_list += (Membership.LEAVE, Membership.BAN)
+        else:
+            membership_list = (Membership.INVITE, Membership.JOIN)
+            if sync_config.filter.include_leave:
+                membership_list += (Membership.LEAVE, Membership.BAN)
 
-        room_list = yield self.store.get_rooms_for_user_where_membership_is(
-            user_id=sync_config.user.to_string(),
-            membership_list=membership_list
-        )
+            room_list = yield self.store.get_rooms_for_user_where_membership_is(
+                user_id=sync_config.user.to_string(),
+                membership_list=membership_list
+            )
+
+            account_data, account_data_by_room = (
+                yield self.store.get_account_data_for_user(
+                    sync_config.user.to_string()
+                )
+            )
 
-        account_data, account_data_by_room = (
-            yield self.store.get_account_data_for_user(
+            tags_by_room = yield self.store.get_tags_for_user(
                 sync_config.user.to_string()
             )
+
+        presence_stream = self.event_sources.sources["presence"]
+
+        joined_room_ids = [
+            room.room_id for room in room_list
+            if room.membership == Membership.JOIN
+        ]
+
+        presence, _ = yield presence_stream.get_new_events(
+            from_key=0,
+            user=sync_config.user,
+            room_ids=joined_room_ids,
+            is_guest=sync_config.is_guest,
         )
 
-        tags_by_room = yield self.store.get_tags_for_user(
-            sync_config.user.to_string()
+        now_token, ephemeral_by_room = yield self.ephemeral_by_room(
+            sync_config, now_token, joined_room_ids
         )
 
         joined = []
@@ -315,11 +356,13 @@ class SyncHandler(BaseHandler):
         return account_data_events
 
     @defer.inlineCallbacks
-    def ephemeral_by_room(self, sync_config, now_token, since_token=None):
+    def ephemeral_by_room(self, sync_config, now_token, room_ids,
+                          since_token=None):
         """Get the ephemeral events for each room the user is in
         Args:
             sync_config (SyncConfig): The flags, filters and user for the sync.
             now_token (StreamToken): Where the server is currently up to.
+            room_ids (list): List of room id strings to get data for.
             since_token (StreamToken): Where the server was when the client
                 last synced.
         Returns:
@@ -330,9 +373,6 @@ class SyncHandler(BaseHandler):
 
         typing_key = since_token.typing_key if since_token else "0"
 
-        rooms = yield self.store.get_rooms_for_user(sync_config.user.to_string())
-        room_ids = [room.room_id for room in rooms]
-
         typing_source = self.event_sources.sources["typing"]
         typing, typing_key = yield typing_source.get_new_events(
             user=sync_config.user,
@@ -410,8 +450,38 @@ class SyncHandler(BaseHandler):
         """
         now_token = yield self.event_sources.get_current_token()
 
-        rooms = yield self.store.get_rooms_for_user(sync_config.user.to_string())
-        room_ids = [room.room_id for room in rooms]
+        if sync_config.is_guest:
+            room_ids = sync_config.filter.list_rooms()
+
+            tags_by_room = {}
+            account_data = {}
+            account_data_by_room = {}
+
+        else:
+            rooms = yield self.store.get_rooms_for_user(
+                sync_config.user.to_string()
+            )
+            room_ids = [room.room_id for room in rooms]
+
+            now_token, ephemeral_by_room = yield self.ephemeral_by_room(
+                sync_config, now_token, since_token
+            )
+
+            tags_by_room = yield self.store.get_updated_tags(
+                sync_config.user.to_string(),
+                since_token.account_data_key,
+            )
+
+            account_data, account_data_by_room = (
+                yield self.store.get_updated_account_data_for_user(
+                    sync_config.user.to_string(),
+                    since_token.account_data_key,
+                )
+            )
+
+        now_token, ephemeral_by_room = yield self.ephemeral_by_room(
+            sync_config, now_token, room_ids, since_token
+        )
 
         presence_source = self.event_sources.sources["presence"]
         presence, presence_key = yield presence_source.get_new_events(
@@ -419,15 +489,10 @@ class SyncHandler(BaseHandler):
             from_key=since_token.presence_key,
             limit=sync_config.filter.presence_limit(),
             room_ids=room_ids,
-            # /sync doesn't support guest access, they can't get to this point in code
-            is_guest=False,
+            is_guest=sync_config.is_guest,
         )
         now_token = now_token.copy_and_replace("presence_key", presence_key)
 
-        now_token, ephemeral_by_room = yield self.ephemeral_by_room(
-            sync_config, now_token, since_token
-        )
-
         rm_handler = self.hs.get_handlers().room_member_handler
         app_service = yield self.store.get_app_service_by_user_id(
             sync_config.user.to_string()
@@ -447,18 +512,8 @@ class SyncHandler(BaseHandler):
             from_key=since_token.room_key,
             to_key=now_token.room_key,
             limit=timeline_limit + 1,
-        )
-
-        tags_by_room = yield self.store.get_updated_tags(
-            sync_config.user.to_string(),
-            since_token.account_data_key,
-        )
-
-        account_data, account_data_by_room = (
-            yield self.store.get_updated_account_data_for_user(
-                sync_config.user.to_string(),
-                since_token.account_data_key,
-            )
+            room_ids=room_ids if sync_config.is_guest else (),
+            is_guest=sync_config.is_guest,
         )
 
         joined = []
@@ -590,7 +645,10 @@ class SyncHandler(BaseHandler):
             end_key = "s" + room_key.split('-')[-1]
             loaded_recents = sync_config.filter.filter_room_timeline(events)
             loaded_recents = yield self._filter_events_for_client(
-                sync_config.user.to_string(), loaded_recents,
+                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
diff --git a/synapse/rest/client/v2_alpha/sync.py b/synapse/rest/client/v2_alpha/sync.py
index 697df03dda..35a70ffad1 100644
--- a/synapse/rest/client/v2_alpha/sync.py
+++ b/synapse/rest/client/v2_alpha/sync.py
@@ -85,7 +85,9 @@ class SyncRestServlet(RestServlet):
 
     @defer.inlineCallbacks
     def on_GET(self, request):
-        user, token_id, _ = yield self.auth.get_user_by_req(request)
+        user, token_id, is_guest = yield self.auth.get_user_by_req(
+            request, allow_guest=True
+        )
 
         timeout = parse_integer(request, "timeout", default=0)
         since = parse_string(request, "since")
@@ -118,8 +120,14 @@ class SyncRestServlet(RestServlet):
             except:
                 filter = FilterCollection({})
 
+        if is_guest and filter.list_rooms() is None:
+            raise SynapseError(
+                400, "Guest users must provide a list of rooms in the filter"
+            )
+
         sync_config = SyncConfig(
             user=user,
+            is_guest=is_guest,
             filter=filter,
         )