192 lines
6.8 KiB
Python
192 lines
6.8 KiB
Python
# Copyright 2014-2016 OpenMarket 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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import logging
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import random
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from typing import TYPE_CHECKING, Iterable, List, Optional
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from synapse.api.constants import EduTypes, EventTypes, Membership, PresenceState
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from synapse.api.errors import AuthError, SynapseError
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from synapse.events import EventBase
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from synapse.events.utils import SerializeEventConfig
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from synapse.handlers.presence import format_user_presence_state
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from synapse.storage.databases.main.events_worker import EventRedactBehaviour
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from synapse.streams.config import PaginationConfig
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from synapse.types import JsonDict, Requester, UserID
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from synapse.visibility import filter_events_for_client
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if TYPE_CHECKING:
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from synapse.server import HomeServer
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logger = logging.getLogger(__name__)
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class EventStreamHandler:
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def __init__(self, hs: "HomeServer"):
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self.store = hs.get_datastores().main
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self.clock = hs.get_clock()
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self.hs = hs
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self.notifier = hs.get_notifier()
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self.state = hs.get_state_handler()
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self._server_notices_sender = hs.get_server_notices_sender()
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self._event_serializer = hs.get_event_client_serializer()
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async def get_stream(
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self,
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requester: Requester,
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pagin_config: PaginationConfig,
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timeout: int = 0,
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as_client_event: bool = True,
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affect_presence: bool = True,
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room_id: Optional[str] = None,
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) -> JsonDict:
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"""Fetches the events stream for a given user."""
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if room_id:
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blocked = await self.store.is_room_blocked(room_id)
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if blocked:
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raise SynapseError(403, "This room has been blocked on this server")
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# send any outstanding server notices to the user.
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await self._server_notices_sender.on_user_syncing(requester.user.to_string())
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presence_handler = self.hs.get_presence_handler()
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context = await presence_handler.user_syncing(
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requester.user.to_string(),
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requester.device_id,
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affect_presence=affect_presence,
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presence_state=PresenceState.ONLINE,
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)
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with context:
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if timeout:
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# If they've set a timeout set a minimum limit.
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timeout = max(timeout, 500)
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# Add some randomness to this value to try and mitigate against
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# thundering herds on restart.
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timeout = random.randint(int(timeout * 0.9), int(timeout * 1.1))
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stream_result = await self.notifier.get_events_for(
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requester.user,
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pagin_config,
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timeout,
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is_guest=requester.is_guest,
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explicit_room_id=room_id,
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)
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events = stream_result.events
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time_now = self.clock.time_msec()
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# When the user joins a new room, or another user joins a currently
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# joined room, we need to send down presence for those users.
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to_add: List[JsonDict] = []
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for event in events:
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if not isinstance(event, EventBase):
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continue
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if event.type == EventTypes.Member:
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if event.membership != Membership.JOIN:
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continue
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# Send down presence.
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if event.state_key == requester.user.to_string():
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# Send down presence for everyone in the room.
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users: Iterable[str] = await self.store.get_users_in_room(
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event.room_id
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)
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else:
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users = [event.state_key]
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states = await presence_handler.get_states(users)
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to_add.extend(
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{
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"type": EduTypes.PRESENCE,
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"content": format_user_presence_state(state, time_now),
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}
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for state in states
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)
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events.extend(to_add)
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chunks = await self._event_serializer.serialize_events(
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events,
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time_now,
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config=SerializeEventConfig(
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as_client_event=as_client_event, requester=requester
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),
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)
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chunk = {
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"chunk": chunks,
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"start": await stream_result.start_token.to_string(self.store),
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"end": await stream_result.end_token.to_string(self.store),
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}
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return chunk
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class EventHandler:
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def __init__(self, hs: "HomeServer"):
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self.store = hs.get_datastores().main
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self._storage_controllers = hs.get_storage_controllers()
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async def get_event(
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self,
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user: UserID,
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room_id: Optional[str],
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event_id: str,
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show_redacted: bool = False,
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) -> Optional[EventBase]:
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"""Retrieve a single specified event.
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Args:
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user: The local user requesting the event
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room_id: The expected room id. We'll return None if the
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event's room does not match.
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event_id: The event ID to obtain.
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show_redacted: Should the full content of redacted events be returned?
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Returns:
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An event, or None if there is no event matching this ID.
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Raises:
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AuthError: if the user does not have the rights to inspect this event.
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"""
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redact_behaviour = (
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EventRedactBehaviour.as_is if show_redacted else EventRedactBehaviour.redact
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)
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event = await self.store.get_event(
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event_id,
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check_room_id=room_id,
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redact_behaviour=redact_behaviour,
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allow_none=True,
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)
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if not event:
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return None
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is_user_in_room = await self.store.check_local_user_in_room(
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user_id=user.to_string(), room_id=event.room_id
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)
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# The user is peeking if they aren't in the room already
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is_peeking = not is_user_in_room
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filtered = await filter_events_for_client(
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self._storage_controllers, user.to_string(), [event], is_peeking=is_peeking
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)
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if not filtered:
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raise AuthError(403, "You don't have permission to access that event.")
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return event
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