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# Copyright 2019 New Vector Ltd
#
# 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, Tuple
from synapse.http.server import HttpServer
from synapse.http.servlet import RestServlet, parse_integer, parse_string
from synapse.http.site import SynapseRequest
from synapse.rest.client._base import client_patterns
from synapse.types import JsonDict, StreamToken
if TYPE_CHECKING:
from synapse.server import HomeServer
logger = logging.getLogger(__name__)
class RelationPaginationServlet(RestServlet):
"""API to paginate relations on an event by topological ordering, optionally
filtered by relation type and event type.
"""
PATTERNS = client_patterns(
"/rooms/(?P<room_id>[^/]*)/relations/(?P<parent_id>[^/]*)"
"(/(?P<relation_type>[^/]*)(/(?P<event_type>[^/]*))?)?$",
releases=("v1",),
)
def __init__(self, hs: "HomeServer"):
super().__init__()
self.auth = hs.get_auth()
self.store = hs.get_datastores().main
self._relations_handler = hs.get_relations_handler()
self._msc3715_enabled = hs.config.experimental.msc3715_enabled
async def on_GET(
self,
request: SynapseRequest,
room_id: str,
parent_id: str,
relation_type: Optional[str] = None,
event_type: Optional[str] = None,
) -> Tuple[int, JsonDict]:
requester = await self.auth.get_user_by_req(request, allow_guest=True)
limit = parse_integer(request, "limit", default=5)
# Fetch the direction parameter, if provided.
#
# TODO Use PaginationConfig.from_request when the unstable parameter is
# no longer needed.
direction = parse_string(request, "dir", allowed_values=["f", "b"])
if direction is None:
if self._msc3715_enabled:
direction = parse_string(
request,
"org.matrix.msc3715.dir",
default="b",
allowed_values=["f", "b"],
)
else:
direction = "b"
from_token_str = parse_string(request, "from")
to_token_str = parse_string(request, "to")
# Return the relations
from_token = None
if from_token_str:
from_token = await StreamToken.from_string(self.store, from_token_str)
to_token = None
if to_token_str:
to_token = await StreamToken.from_string(self.store, to_token_str)
result = await self._relations_handler.get_relations(
requester=requester,
event_id=parent_id,
room_id=room_id,
relation_type=relation_type,
event_type=event_type,
limit=limit,
direction=direction,
from_token=from_token,
to_token=to_token,
)
return 200, result
def register_servlets(hs: "HomeServer", http_server: HttpServer) -> None:
RelationPaginationServlet(hs).register(http_server)
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