diff --git a/synapse/handlers/pagination.py b/synapse/handlers/pagination.py
index 60059fec3e..41679f7f86 100644
--- a/synapse/handlers/pagination.py
+++ b/synapse/handlers/pagination.py
@@ -13,7 +13,7 @@
# See the License for the specific language governing permissions and
# limitations under the License.
import logging
-from typing import TYPE_CHECKING, Any, Collection, Dict, List, Optional, Set
+from typing import TYPE_CHECKING, Collection, Dict, List, Optional, Set
import attr
@@ -422,7 +422,7 @@ class PaginationHandler:
pagin_config: PaginationConfig,
as_client_event: bool = True,
event_filter: Optional[Filter] = None,
- ) -> Dict[str, Any]:
+ ) -> JsonDict:
"""Get messages in a room.
Args:
@@ -431,6 +431,7 @@ class PaginationHandler:
pagin_config: The pagination config rules to apply, if any.
as_client_event: True to get events in client-server format.
event_filter: Filter to apply to results or None
+
Returns:
Pagination API results
"""
diff --git a/synapse/handlers/relations.py b/synapse/handlers/relations.py
new file mode 100644
index 0000000000..8e475475ad
--- /dev/null
+++ b/synapse/handlers/relations.py
@@ -0,0 +1,117 @@
+# Copyright 2021 The Matrix.org Foundation C.I.C.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+import logging
+from typing import TYPE_CHECKING, Optional
+
+from synapse.api.errors import SynapseError
+from synapse.types import JsonDict, Requester, StreamToken
+
+if TYPE_CHECKING:
+ from synapse.server import HomeServer
+
+
+logger = logging.getLogger(__name__)
+
+
+class RelationsHandler:
+ def __init__(self, hs: "HomeServer"):
+ self._main_store = hs.get_datastores().main
+ self._auth = hs.get_auth()
+ self._clock = hs.get_clock()
+ self._event_handler = hs.get_event_handler()
+ self._event_serializer = hs.get_event_client_serializer()
+
+ async def get_relations(
+ self,
+ requester: Requester,
+ event_id: str,
+ room_id: str,
+ relation_type: Optional[str] = None,
+ event_type: Optional[str] = None,
+ aggregation_key: Optional[str] = None,
+ limit: int = 5,
+ direction: str = "b",
+ from_token: Optional[StreamToken] = None,
+ to_token: Optional[StreamToken] = None,
+ ) -> JsonDict:
+ """Get related events of a event, ordered by topological ordering.
+
+ TODO Accept a PaginationConfig instead of individual pagination parameters.
+
+ Args:
+ requester: The user requesting the relations.
+ event_id: Fetch events that relate to this event ID.
+ room_id: The room the event belongs to.
+ relation_type: Only fetch events with this relation type, if given.
+ event_type: Only fetch events with this event type, if given.
+ aggregation_key: Only fetch events with this aggregation key, if given.
+ limit: Only fetch the most recent `limit` events.
+ direction: Whether to fetch the most recent first (`"b"`) or the
+ oldest first (`"f"`).
+ from_token: Fetch rows from the given token, or from the start if None.
+ to_token: Fetch rows up to the given token, or up to the end if None.
+
+ Returns:
+ The pagination chunk.
+ """
+
+ user_id = requester.user.to_string()
+
+ await self._auth.check_user_in_room_or_world_readable(
+ room_id, user_id, allow_departed_users=True
+ )
+
+ # This gets the original event and checks that a) the event exists and
+ # b) the user is allowed to view it.
+ event = await self._event_handler.get_event(requester.user, room_id, event_id)
+ if event is None:
+ raise SynapseError(404, "Unknown parent event.")
+
+ pagination_chunk = await self._main_store.get_relations_for_event(
+ event_id=event_id,
+ event=event,
+ room_id=room_id,
+ relation_type=relation_type,
+ event_type=event_type,
+ aggregation_key=aggregation_key,
+ limit=limit,
+ direction=direction,
+ from_token=from_token,
+ to_token=to_token,
+ )
+
+ events = await self._main_store.get_events_as_list(
+ [c["event_id"] for c in pagination_chunk.chunk]
+ )
+
+ now = self._clock.time_msec()
+ # Do not bundle aggregations when retrieving the original event because
+ # we want the content before relations are applied to it.
+ original_event = self._event_serializer.serialize_event(
+ event, now, bundle_aggregations=None
+ )
+ # The relations returned for the requested event do include their
+ # bundled aggregations.
+ aggregations = await self._main_store.get_bundled_aggregations(
+ events, requester.user.to_string()
+ )
+ serialized_events = self._event_serializer.serialize_events(
+ events, now, bundle_aggregations=aggregations
+ )
+
+ return_value = await pagination_chunk.to_dict(self._main_store)
+ return_value["chunk"] = serialized_events
+ return_value["original_event"] = original_event
+
+ return return_value
|
