373 lines
12 KiB
Python
373 lines
12 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2019 New Vector Ltd
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""This class implements the proposed relation APIs from MSC 1849.
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Since the MSC has not been approved all APIs here are unstable and may change at
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any time to reflect changes in the MSC.
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"""
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import logging
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from synapse.api.constants import EventTypes, RelationTypes
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from synapse.api.errors import ShadowBanError, SynapseError
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from synapse.http.servlet import (
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RestServlet,
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parse_integer,
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parse_json_object_from_request,
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parse_string,
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)
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from synapse.rest.client.transactions import HttpTransactionCache
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from synapse.storage.relations import (
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AggregationPaginationToken,
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PaginationChunk,
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RelationPaginationToken,
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)
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from synapse.util.stringutils import random_string
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from ._base import client_patterns
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logger = logging.getLogger(__name__)
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class RelationSendServlet(RestServlet):
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"""Helper API for sending events that have relation data.
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Example API shape to send a 👍 reaction to a room:
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POST /rooms/!foo/send_relation/$bar/m.annotation/m.reaction?key=%F0%9F%91%8D
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{}
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{
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"event_id": "$foobar"
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}
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"""
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PATTERN = (
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"/rooms/(?P<room_id>[^/]*)/send_relation"
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"/(?P<parent_id>[^/]*)/(?P<relation_type>[^/]*)/(?P<event_type>[^/]*)"
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)
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def __init__(self, hs):
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super().__init__()
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self.auth = hs.get_auth()
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self.event_creation_handler = hs.get_event_creation_handler()
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self.txns = HttpTransactionCache(hs)
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def register(self, http_server):
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http_server.register_paths(
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"POST",
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client_patterns(self.PATTERN + "$", releases=()),
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self.on_PUT_or_POST,
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self.__class__.__name__,
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)
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http_server.register_paths(
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"PUT",
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client_patterns(self.PATTERN + "/(?P<txn_id>[^/]*)$", releases=()),
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self.on_PUT,
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self.__class__.__name__,
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)
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def on_PUT(self, request, *args, **kwargs):
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return self.txns.fetch_or_execute_request(
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request, self.on_PUT_or_POST, request, *args, **kwargs
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)
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async def on_PUT_or_POST(
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self, request, room_id, parent_id, relation_type, event_type, txn_id=None
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):
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requester = await self.auth.get_user_by_req(request, allow_guest=True)
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if event_type == EventTypes.Member:
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# Add relations to a membership is meaningless, so we just deny it
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# at the CS API rather than trying to handle it correctly.
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raise SynapseError(400, "Cannot send member events with relations")
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content = parse_json_object_from_request(request)
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aggregation_key = parse_string(request, "key", encoding="utf-8")
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content["m.relates_to"] = {
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"event_id": parent_id,
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"key": aggregation_key,
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"rel_type": relation_type,
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}
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event_dict = {
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"type": event_type,
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"content": content,
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"room_id": room_id,
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"sender": requester.user.to_string(),
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}
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try:
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(
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event,
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_,
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) = await self.event_creation_handler.create_and_send_nonmember_event(
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requester, event_dict=event_dict, txn_id=txn_id
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)
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event_id = event.event_id
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except ShadowBanError:
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event_id = "$" + random_string(43)
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return 200, {"event_id": event_id}
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class RelationPaginationServlet(RestServlet):
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"""API to paginate relations on an event by topological ordering, optionally
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filtered by relation type and event type.
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"""
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PATTERNS = client_patterns(
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"/rooms/(?P<room_id>[^/]*)/relations/(?P<parent_id>[^/]*)"
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"(/(?P<relation_type>[^/]*)(/(?P<event_type>[^/]*))?)?$",
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releases=(),
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)
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def __init__(self, hs):
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super().__init__()
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self.auth = hs.get_auth()
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self.store = hs.get_datastore()
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self.clock = hs.get_clock()
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self._event_serializer = hs.get_event_client_serializer()
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self.event_handler = hs.get_event_handler()
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async def on_GET(
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self, request, room_id, parent_id, relation_type=None, event_type=None
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):
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requester = await self.auth.get_user_by_req(request, allow_guest=True)
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await self.auth.check_user_in_room_or_world_readable(
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room_id, requester.user.to_string(), allow_departed_users=True
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)
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# This gets the original event and checks that a) the event exists and
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# b) the user is allowed to view it.
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event = await self.event_handler.get_event(requester.user, room_id, parent_id)
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limit = parse_integer(request, "limit", default=5)
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from_token = parse_string(request, "from")
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to_token = parse_string(request, "to")
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if event.internal_metadata.is_redacted():
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# If the event is redacted, return an empty list of relations
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pagination_chunk = PaginationChunk(chunk=[])
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else:
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# Return the relations
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if from_token:
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from_token = RelationPaginationToken.from_string(from_token)
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if to_token:
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to_token = RelationPaginationToken.from_string(to_token)
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pagination_chunk = await self.store.get_relations_for_event(
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event_id=parent_id,
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relation_type=relation_type,
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event_type=event_type,
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limit=limit,
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from_token=from_token,
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to_token=to_token,
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)
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events = await self.store.get_events_as_list(
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[c["event_id"] for c in pagination_chunk.chunk]
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)
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now = self.clock.time_msec()
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# We set bundle_aggregations to False when retrieving the original
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# event because we want the content before relations were applied to
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# it.
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original_event = await self._event_serializer.serialize_event(
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event, now, bundle_aggregations=False
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)
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# Similarly, we don't allow relations to be applied to relations, so we
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# return the original relations without any aggregations on top of them
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# here.
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events = await self._event_serializer.serialize_events(
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events, now, bundle_aggregations=False
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)
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return_value = pagination_chunk.to_dict()
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return_value["chunk"] = events
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return_value["original_event"] = original_event
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return 200, return_value
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class RelationAggregationPaginationServlet(RestServlet):
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"""API to paginate aggregation groups of relations, e.g. paginate the
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types and counts of the reactions on the events.
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Example request and response:
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GET /rooms/{room_id}/aggregations/{parent_id}
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{
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chunk: [
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{
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"type": "m.reaction",
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"key": "👍",
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"count": 3
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}
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]
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}
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"""
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PATTERNS = client_patterns(
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"/rooms/(?P<room_id>[^/]*)/aggregations/(?P<parent_id>[^/]*)"
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"(/(?P<relation_type>[^/]*)(/(?P<event_type>[^/]*))?)?$",
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releases=(),
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)
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def __init__(self, hs):
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super().__init__()
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self.auth = hs.get_auth()
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self.store = hs.get_datastore()
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self.event_handler = hs.get_event_handler()
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async def on_GET(
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self, request, room_id, parent_id, relation_type=None, event_type=None
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):
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requester = await self.auth.get_user_by_req(request, allow_guest=True)
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await self.auth.check_user_in_room_or_world_readable(
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room_id, requester.user.to_string(), allow_departed_users=True,
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)
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# This checks that a) the event exists and b) the user is allowed to
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# view it.
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event = await self.event_handler.get_event(requester.user, room_id, parent_id)
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if relation_type not in (RelationTypes.ANNOTATION, None):
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raise SynapseError(400, "Relation type must be 'annotation'")
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limit = parse_integer(request, "limit", default=5)
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from_token = parse_string(request, "from")
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to_token = parse_string(request, "to")
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if event.internal_metadata.is_redacted():
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# If the event is redacted, return an empty list of relations
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pagination_chunk = PaginationChunk(chunk=[])
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else:
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# Return the relations
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if from_token:
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from_token = AggregationPaginationToken.from_string(from_token)
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if to_token:
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to_token = AggregationPaginationToken.from_string(to_token)
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pagination_chunk = await self.store.get_aggregation_groups_for_event(
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event_id=parent_id,
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event_type=event_type,
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limit=limit,
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from_token=from_token,
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to_token=to_token,
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)
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return 200, pagination_chunk.to_dict()
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class RelationAggregationGroupPaginationServlet(RestServlet):
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"""API to paginate within an aggregation group of relations, e.g. paginate
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all the 👍 reactions on an event.
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Example request and response:
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GET /rooms/{room_id}/aggregations/{parent_id}/m.annotation/m.reaction/👍
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{
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chunk: [
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{
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"type": "m.reaction",
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"content": {
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"m.relates_to": {
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"rel_type": "m.annotation",
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"key": "👍"
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}
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}
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},
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...
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]
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}
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"""
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PATTERNS = client_patterns(
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"/rooms/(?P<room_id>[^/]*)/aggregations/(?P<parent_id>[^/]*)"
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"/(?P<relation_type>[^/]*)/(?P<event_type>[^/]*)/(?P<key>[^/]*)$",
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releases=(),
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)
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def __init__(self, hs):
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super().__init__()
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self.auth = hs.get_auth()
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self.store = hs.get_datastore()
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self.clock = hs.get_clock()
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self._event_serializer = hs.get_event_client_serializer()
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self.event_handler = hs.get_event_handler()
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async def on_GET(self, request, room_id, parent_id, relation_type, event_type, key):
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requester = await self.auth.get_user_by_req(request, allow_guest=True)
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await self.auth.check_user_in_room_or_world_readable(
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room_id, requester.user.to_string(), allow_departed_users=True,
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)
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# This checks that a) the event exists and b) the user is allowed to
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# view it.
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await self.event_handler.get_event(requester.user, room_id, parent_id)
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if relation_type != RelationTypes.ANNOTATION:
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raise SynapseError(400, "Relation type must be 'annotation'")
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limit = parse_integer(request, "limit", default=5)
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from_token = parse_string(request, "from")
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to_token = parse_string(request, "to")
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if from_token:
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from_token = RelationPaginationToken.from_string(from_token)
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if to_token:
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to_token = RelationPaginationToken.from_string(to_token)
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result = await self.store.get_relations_for_event(
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event_id=parent_id,
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relation_type=relation_type,
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event_type=event_type,
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aggregation_key=key,
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limit=limit,
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from_token=from_token,
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to_token=to_token,
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)
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events = await self.store.get_events_as_list(
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[c["event_id"] for c in result.chunk]
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)
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now = self.clock.time_msec()
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events = await self._event_serializer.serialize_events(events, now)
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return_value = result.to_dict()
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return_value["chunk"] = events
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return 200, return_value
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def register_servlets(hs, http_server):
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RelationSendServlet(hs).register(http_server)
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RelationPaginationServlet(hs).register(http_server)
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RelationAggregationPaginationServlet(hs).register(http_server)
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RelationAggregationGroupPaginationServlet(hs).register(http_server)
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