mirror of
https://git.anonymousland.org/anonymousland/synapse.git
synced 2024-12-26 03:39:27 -05:00
82c1ee1c22
This is *not* ready for production yet. Caveats: 1. We should write some tests... 2. The stream token that we use for events can get stalled at the minimum position of all writers. This means that new events may not be processed and e.g. sent down sync streams if a writer isn't writing or is slow.
1250 lines
47 KiB
Python
1250 lines
47 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2016-2020 The Matrix.org Foundation C.I.C.
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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 abc
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import logging
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import random
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from http import HTTPStatus
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from typing import TYPE_CHECKING, Iterable, List, Optional, Tuple, Union
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from unpaddedbase64 import encode_base64
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from synapse import types
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from synapse.api.constants import MAX_DEPTH, EventTypes, Membership
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from synapse.api.errors import (
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AuthError,
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Codes,
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LimitExceededError,
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ShadowBanError,
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SynapseError,
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)
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from synapse.api.ratelimiting import Ratelimiter
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from synapse.api.room_versions import EventFormatVersions
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from synapse.crypto.event_signing import compute_event_reference_hash
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from synapse.events import EventBase
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from synapse.events.builder import create_local_event_from_event_dict
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from synapse.events.snapshot import EventContext
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from synapse.events.validator import EventValidator
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from synapse.storage.roommember import RoomsForUser
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from synapse.types import JsonDict, Requester, RoomAlias, RoomID, StateMap, UserID
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from synapse.util.async_helpers import Linearizer
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from synapse.util.distributor import user_joined_room, user_left_room
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from ._base import BaseHandler
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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 RoomMemberHandler(object):
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# TODO(paul): This handler currently contains a messy conflation of
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# low-level API that works on UserID objects and so on, and REST-level
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# API that takes ID strings and returns pagination chunks. These concerns
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# ought to be separated out a lot better.
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__metaclass__ = abc.ABCMeta
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def __init__(self, hs: "HomeServer"):
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self.hs = hs
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self.store = hs.get_datastore()
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self.auth = hs.get_auth()
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self.state_handler = hs.get_state_handler()
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self.config = hs.config
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self.federation_handler = hs.get_handlers().federation_handler
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self.directory_handler = hs.get_handlers().directory_handler
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self.identity_handler = hs.get_handlers().identity_handler
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self.registration_handler = hs.get_registration_handler()
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self.profile_handler = hs.get_profile_handler()
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self.event_creation_handler = hs.get_event_creation_handler()
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self.member_linearizer = Linearizer(name="member")
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self.clock = hs.get_clock()
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self.spam_checker = hs.get_spam_checker()
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self.third_party_event_rules = hs.get_third_party_event_rules()
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self._server_notices_mxid = self.config.server_notices_mxid
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self._enable_lookup = hs.config.enable_3pid_lookup
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self.allow_per_room_profiles = self.config.allow_per_room_profiles
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self._join_rate_limiter_local = Ratelimiter(
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clock=self.clock,
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rate_hz=hs.config.ratelimiting.rc_joins_local.per_second,
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burst_count=hs.config.ratelimiting.rc_joins_local.burst_count,
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)
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self._join_rate_limiter_remote = Ratelimiter(
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clock=self.clock,
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rate_hz=hs.config.ratelimiting.rc_joins_remote.per_second,
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burst_count=hs.config.ratelimiting.rc_joins_remote.burst_count,
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)
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# This is only used to get at ratelimit function, and
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# maybe_kick_guest_users. It's fine there are multiple of these as
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# it doesn't store state.
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self.base_handler = BaseHandler(hs)
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@abc.abstractmethod
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async def _remote_join(
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self,
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requester: Requester,
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remote_room_hosts: List[str],
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room_id: str,
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user: UserID,
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content: dict,
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) -> Tuple[str, int]:
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"""Try and join a room that this server is not in
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Args:
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requester
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remote_room_hosts: List of servers that can be used to join via.
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room_id: Room that we are trying to join
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user: User who is trying to join
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content: A dict that should be used as the content of the join event.
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"""
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raise NotImplementedError()
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@abc.abstractmethod
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async def remote_reject_invite(
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self,
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invite_event_id: str,
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txn_id: Optional[str],
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requester: Requester,
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content: JsonDict,
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) -> Tuple[str, int]:
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"""
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Rejects an out-of-band invite we have received from a remote server
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Args:
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invite_event_id: ID of the invite to be rejected
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txn_id: optional transaction ID supplied by the client
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requester: user making the rejection request, according to the access token
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content: additional content to include in the rejection event.
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Normally an empty dict.
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Returns:
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event id, stream_id of the leave event
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"""
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raise NotImplementedError()
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@abc.abstractmethod
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async def _user_joined_room(self, target: UserID, room_id: str) -> None:
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"""Notifies distributor on master process that the user has joined the
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room.
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Args:
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target
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room_id
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"""
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raise NotImplementedError()
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@abc.abstractmethod
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async def _user_left_room(self, target: UserID, room_id: str) -> None:
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"""Notifies distributor on master process that the user has left the
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room.
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Args:
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target
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room_id
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"""
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raise NotImplementedError()
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async def _local_membership_update(
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self,
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requester: Requester,
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target: UserID,
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room_id: str,
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membership: str,
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prev_event_ids: List[str],
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txn_id: Optional[str] = None,
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ratelimit: bool = True,
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content: Optional[dict] = None,
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require_consent: bool = True,
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) -> Tuple[str, int]:
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user_id = target.to_string()
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if content is None:
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content = {}
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content["membership"] = membership
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if requester.is_guest:
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content["kind"] = "guest"
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event, context = await self.event_creation_handler.create_event(
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requester,
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{
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"type": EventTypes.Member,
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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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"state_key": user_id,
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# For backwards compatibility:
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"membership": membership,
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},
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token_id=requester.access_token_id,
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txn_id=txn_id,
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prev_event_ids=prev_event_ids,
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require_consent=require_consent,
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)
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# Check if this event matches the previous membership event for the user.
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duplicate = await self.event_creation_handler.deduplicate_state_event(
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event, context
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)
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if duplicate is not None:
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# Discard the new event since this membership change is a no-op.
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_, stream_id = await self.store.get_event_ordering(duplicate.event_id)
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return duplicate.event_id, stream_id
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prev_state_ids = await context.get_prev_state_ids()
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prev_member_event_id = prev_state_ids.get((EventTypes.Member, user_id), None)
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newly_joined = False
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if event.membership == Membership.JOIN:
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newly_joined = True
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if prev_member_event_id:
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prev_member_event = await self.store.get_event(prev_member_event_id)
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newly_joined = prev_member_event.membership != Membership.JOIN
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# Only rate-limit if the user actually joined the room, otherwise we'll end
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# up blocking profile updates.
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if newly_joined:
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time_now_s = self.clock.time()
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(
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allowed,
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time_allowed,
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) = self._join_rate_limiter_local.can_requester_do_action(requester)
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if not allowed:
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raise LimitExceededError(
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retry_after_ms=int(1000 * (time_allowed - time_now_s))
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)
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stream_id = await self.event_creation_handler.handle_new_client_event(
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requester, event, context, extra_users=[target], ratelimit=ratelimit,
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)
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if event.membership == Membership.JOIN and newly_joined:
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# Only fire user_joined_room if the user has actually joined the
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# room. Don't bother if the user is just changing their profile
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# info.
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await self._user_joined_room(target, room_id)
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elif event.membership == Membership.LEAVE:
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if prev_member_event_id:
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prev_member_event = await self.store.get_event(prev_member_event_id)
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if prev_member_event.membership == Membership.JOIN:
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await self._user_left_room(target, room_id)
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return event.event_id, stream_id
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async def copy_room_tags_and_direct_to_room(
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self, old_room_id, new_room_id, user_id
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) -> None:
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"""Copies the tags and direct room state from one room to another.
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Args:
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old_room_id: The room ID of the old room.
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new_room_id: The room ID of the new room.
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user_id: The user's ID.
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"""
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# Retrieve user account data for predecessor room
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user_account_data, _ = await self.store.get_account_data_for_user(user_id)
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# Copy direct message state if applicable
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direct_rooms = user_account_data.get("m.direct", {})
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# Check which key this room is under
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if isinstance(direct_rooms, dict):
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for key, room_id_list in direct_rooms.items():
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if old_room_id in room_id_list and new_room_id not in room_id_list:
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# Add new room_id to this key
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direct_rooms[key].append(new_room_id)
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# Save back to user's m.direct account data
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await self.store.add_account_data_for_user(
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user_id, "m.direct", direct_rooms
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)
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break
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# Copy room tags if applicable
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room_tags = await self.store.get_tags_for_room(user_id, old_room_id)
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# Copy each room tag to the new room
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for tag, tag_content in room_tags.items():
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await self.store.add_tag_to_room(user_id, new_room_id, tag, tag_content)
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async def update_membership(
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self,
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requester: Requester,
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target: UserID,
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room_id: str,
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action: str,
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txn_id: Optional[str] = None,
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remote_room_hosts: Optional[List[str]] = None,
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third_party_signed: Optional[dict] = None,
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ratelimit: bool = True,
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content: Optional[dict] = None,
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require_consent: bool = True,
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) -> Tuple[str, int]:
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"""Update a user's membership in a room.
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Params:
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requester: The user who is performing the update.
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target: The user whose membership is being updated.
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room_id: The room ID whose membership is being updated.
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action: The membership change, see synapse.api.constants.Membership.
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txn_id: The transaction ID, if given.
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remote_room_hosts: Remote servers to send the update to.
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third_party_signed: Information from a 3PID invite.
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ratelimit: Whether to rate limit the request.
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content: The content of the created event.
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require_consent: Whether consent is required.
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Returns:
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A tuple of the new event ID and stream ID.
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Raises:
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ShadowBanError if a shadow-banned requester attempts to send an invite.
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"""
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if action == Membership.INVITE and requester.shadow_banned:
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# We randomly sleep a bit just to annoy the requester.
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await self.clock.sleep(random.randint(1, 10))
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raise ShadowBanError()
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key = (room_id,)
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with (await self.member_linearizer.queue(key)):
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result = await self._update_membership(
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requester,
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target,
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room_id,
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action,
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txn_id=txn_id,
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remote_room_hosts=remote_room_hosts,
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third_party_signed=third_party_signed,
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ratelimit=ratelimit,
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content=content,
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require_consent=require_consent,
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)
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return result
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async def _update_membership(
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self,
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requester: Requester,
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target: UserID,
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room_id: str,
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action: str,
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txn_id: Optional[str] = None,
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remote_room_hosts: Optional[List[str]] = None,
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third_party_signed: Optional[dict] = None,
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ratelimit: bool = True,
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content: Optional[dict] = None,
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require_consent: bool = True,
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) -> Tuple[str, int]:
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content_specified = bool(content)
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if content is None:
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content = {}
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else:
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# We do a copy here as we potentially change some keys
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# later on.
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content = dict(content)
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if not self.allow_per_room_profiles or requester.shadow_banned:
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# Strip profile data, knowing that new profile data will be added to the
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# event's content in event_creation_handler.create_event() using the target's
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# global profile.
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content.pop("displayname", None)
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content.pop("avatar_url", None)
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effective_membership_state = action
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if action in ["kick", "unban"]:
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effective_membership_state = "leave"
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# if this is a join with a 3pid signature, we may need to turn a 3pid
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# invite into a normal invite before we can handle the join.
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if third_party_signed is not None:
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await self.federation_handler.exchange_third_party_invite(
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third_party_signed["sender"],
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target.to_string(),
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room_id,
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third_party_signed,
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)
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if not remote_room_hosts:
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remote_room_hosts = []
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if effective_membership_state not in ("leave", "ban"):
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is_blocked = await self.store.is_room_blocked(room_id)
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if is_blocked:
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raise SynapseError(403, "This room has been blocked on this server")
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if effective_membership_state == Membership.INVITE:
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# block any attempts to invite the server notices mxid
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if target.to_string() == self._server_notices_mxid:
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raise SynapseError(HTTPStatus.FORBIDDEN, "Cannot invite this user")
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block_invite = False
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if (
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self._server_notices_mxid is not None
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and requester.user.to_string() == self._server_notices_mxid
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):
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# allow the server notices mxid to send invites
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is_requester_admin = True
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else:
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is_requester_admin = await self.auth.is_server_admin(requester.user)
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if not is_requester_admin:
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if self.config.block_non_admin_invites:
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logger.info(
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"Blocking invite: user is not admin and non-admin "
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"invites disabled"
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)
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block_invite = True
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if not self.spam_checker.user_may_invite(
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requester.user.to_string(), target.to_string(), room_id
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):
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logger.info("Blocking invite due to spam checker")
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block_invite = True
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if block_invite:
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raise SynapseError(403, "Invites have been disabled on this server")
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latest_event_ids = await self.store.get_prev_events_for_room(room_id)
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current_state_ids = await self.state_handler.get_current_state_ids(
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room_id, latest_event_ids=latest_event_ids
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)
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# TODO: Refactor into dictionary of explicitly allowed transitions
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# between old and new state, with specific error messages for some
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# transitions and generic otherwise
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old_state_id = current_state_ids.get((EventTypes.Member, target.to_string()))
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if old_state_id:
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old_state = await self.store.get_event(old_state_id, allow_none=True)
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old_membership = old_state.content.get("membership") if old_state else None
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if action == "unban" and old_membership != "ban":
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raise SynapseError(
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403,
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"Cannot unban user who was not banned"
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" (membership=%s)" % old_membership,
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errcode=Codes.BAD_STATE,
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)
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if old_membership == "ban" and action != "unban":
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raise SynapseError(
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403,
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"Cannot %s user who was banned" % (action,),
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errcode=Codes.BAD_STATE,
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)
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if old_state:
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same_content = content == old_state.content
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same_membership = old_membership == effective_membership_state
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same_sender = requester.user.to_string() == old_state.sender
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if same_sender and same_membership and same_content:
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_, stream_id = await self.store.get_event_ordering(
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old_state.event_id
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)
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return (
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old_state.event_id,
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stream_id,
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)
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if old_membership in ["ban", "leave"] and action == "kick":
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raise AuthError(403, "The target user is not in the room")
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# we don't allow people to reject invites to the server notice
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# room, but they can leave it once they are joined.
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if (
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old_membership == Membership.INVITE
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and effective_membership_state == Membership.LEAVE
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):
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is_blocked = await self._is_server_notice_room(room_id)
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if is_blocked:
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raise SynapseError(
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HTTPStatus.FORBIDDEN,
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"You cannot reject this invite",
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errcode=Codes.CANNOT_LEAVE_SERVER_NOTICE_ROOM,
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)
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else:
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if action == "kick":
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raise AuthError(403, "The target user is not in the room")
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is_host_in_room = await self._is_host_in_room(current_state_ids)
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if effective_membership_state == Membership.JOIN:
|
|
if requester.is_guest:
|
|
guest_can_join = await self._can_guest_join(current_state_ids)
|
|
if not guest_can_join:
|
|
# This should be an auth check, but guests are a local concept,
|
|
# so don't really fit into the general auth process.
|
|
raise AuthError(403, "Guest access not allowed")
|
|
|
|
if not is_host_in_room:
|
|
time_now_s = self.clock.time()
|
|
(
|
|
allowed,
|
|
time_allowed,
|
|
) = self._join_rate_limiter_remote.can_requester_do_action(requester,)
|
|
|
|
if not allowed:
|
|
raise LimitExceededError(
|
|
retry_after_ms=int(1000 * (time_allowed - time_now_s))
|
|
)
|
|
|
|
inviter = await self._get_inviter(target.to_string(), room_id)
|
|
if inviter and not self.hs.is_mine(inviter):
|
|
remote_room_hosts.append(inviter.domain)
|
|
|
|
content["membership"] = Membership.JOIN
|
|
|
|
profile = self.profile_handler
|
|
if not content_specified:
|
|
content["displayname"] = await profile.get_displayname(target)
|
|
content["avatar_url"] = await profile.get_avatar_url(target)
|
|
|
|
if requester.is_guest:
|
|
content["kind"] = "guest"
|
|
|
|
remote_join_response = await self._remote_join(
|
|
requester, remote_room_hosts, room_id, target, content
|
|
)
|
|
|
|
return remote_join_response
|
|
|
|
elif effective_membership_state == Membership.LEAVE:
|
|
if not is_host_in_room:
|
|
# perhaps we've been invited
|
|
invite = await self.store.get_invite_for_local_user_in_room(
|
|
user_id=target.to_string(), room_id=room_id
|
|
) # type: Optional[RoomsForUser]
|
|
if not invite:
|
|
logger.info(
|
|
"%s sent a leave request to %s, but that is not an active room "
|
|
"on this server, and there is no pending invite",
|
|
target,
|
|
room_id,
|
|
)
|
|
|
|
raise SynapseError(404, "Not a known room")
|
|
|
|
logger.info(
|
|
"%s rejects invite to %s from %s", target, room_id, invite.sender
|
|
)
|
|
|
|
if not self.hs.is_mine_id(invite.sender):
|
|
# send the rejection to the inviter's HS (with fallback to
|
|
# local event)
|
|
return await self.remote_reject_invite(
|
|
invite.event_id, txn_id, requester, content,
|
|
)
|
|
|
|
# the inviter was on our server, but has now left. Carry on
|
|
# with the normal rejection codepath, which will also send the
|
|
# rejection out to any other servers we believe are still in the room.
|
|
|
|
# thanks to overzealous cleaning up of event_forward_extremities in
|
|
# `delete_old_current_state_events`, it's possible to end up with no
|
|
# forward extremities here. If that happens, let's just hang the
|
|
# rejection off the invite event.
|
|
#
|
|
# see: https://github.com/matrix-org/synapse/issues/7139
|
|
if len(latest_event_ids) == 0:
|
|
latest_event_ids = [invite.event_id]
|
|
|
|
return await self._local_membership_update(
|
|
requester=requester,
|
|
target=target,
|
|
room_id=room_id,
|
|
membership=effective_membership_state,
|
|
txn_id=txn_id,
|
|
ratelimit=ratelimit,
|
|
prev_event_ids=latest_event_ids,
|
|
content=content,
|
|
require_consent=require_consent,
|
|
)
|
|
|
|
async def transfer_room_state_on_room_upgrade(
|
|
self, old_room_id: str, room_id: str
|
|
) -> None:
|
|
"""Upon our server becoming aware of an upgraded room, either by upgrading a room
|
|
ourselves or joining one, we can transfer over information from the previous room.
|
|
|
|
Copies user state (tags/push rules) for every local user that was in the old room, as
|
|
well as migrating the room directory state.
|
|
|
|
Args:
|
|
old_room_id: The ID of the old room
|
|
room_id: The ID of the new room
|
|
"""
|
|
logger.info("Transferring room state from %s to %s", old_room_id, room_id)
|
|
|
|
# Find all local users that were in the old room and copy over each user's state
|
|
users = await self.store.get_users_in_room(old_room_id)
|
|
await self.copy_user_state_on_room_upgrade(old_room_id, room_id, users)
|
|
|
|
# Add new room to the room directory if the old room was there
|
|
# Remove old room from the room directory
|
|
old_room = await self.store.get_room(old_room_id)
|
|
if old_room and old_room["is_public"]:
|
|
await self.store.set_room_is_public(old_room_id, False)
|
|
await self.store.set_room_is_public(room_id, True)
|
|
|
|
# Transfer alias mappings in the room directory
|
|
await self.store.update_aliases_for_room(old_room_id, room_id)
|
|
|
|
# Check if any groups we own contain the predecessor room
|
|
local_group_ids = await self.store.get_local_groups_for_room(old_room_id)
|
|
for group_id in local_group_ids:
|
|
# Add new the new room to those groups
|
|
await self.store.add_room_to_group(group_id, room_id, old_room["is_public"])
|
|
|
|
# Remove the old room from those groups
|
|
await self.store.remove_room_from_group(group_id, old_room_id)
|
|
|
|
async def copy_user_state_on_room_upgrade(
|
|
self, old_room_id: str, new_room_id: str, user_ids: Iterable[str]
|
|
) -> None:
|
|
"""Copy user-specific information when they join a new room when that new room is the
|
|
result of a room upgrade
|
|
|
|
Args:
|
|
old_room_id: The ID of upgraded room
|
|
new_room_id: The ID of the new room
|
|
user_ids: User IDs to copy state for
|
|
"""
|
|
|
|
logger.debug(
|
|
"Copying over room tags and push rules from %s to %s for users %s",
|
|
old_room_id,
|
|
new_room_id,
|
|
user_ids,
|
|
)
|
|
|
|
for user_id in user_ids:
|
|
try:
|
|
# It is an upgraded room. Copy over old tags
|
|
await self.copy_room_tags_and_direct_to_room(
|
|
old_room_id, new_room_id, user_id
|
|
)
|
|
# Copy over push rules
|
|
await self.store.copy_push_rules_from_room_to_room_for_user(
|
|
old_room_id, new_room_id, user_id
|
|
)
|
|
except Exception:
|
|
logger.exception(
|
|
"Error copying tags and/or push rules from rooms %s to %s for user %s. "
|
|
"Skipping...",
|
|
old_room_id,
|
|
new_room_id,
|
|
user_id,
|
|
)
|
|
continue
|
|
|
|
async def send_membership_event(
|
|
self,
|
|
requester: Requester,
|
|
event: EventBase,
|
|
context: EventContext,
|
|
ratelimit: bool = True,
|
|
):
|
|
"""
|
|
Change the membership status of a user in a room.
|
|
|
|
Args:
|
|
requester: The local user who requested the membership
|
|
event. If None, certain checks, like whether this homeserver can
|
|
act as the sender, will be skipped.
|
|
event: The membership event.
|
|
context: The context of the event.
|
|
ratelimit: Whether to rate limit this request.
|
|
Raises:
|
|
SynapseError if there was a problem changing the membership.
|
|
"""
|
|
target_user = UserID.from_string(event.state_key)
|
|
room_id = event.room_id
|
|
|
|
if requester is not None:
|
|
sender = UserID.from_string(event.sender)
|
|
assert (
|
|
sender == requester.user
|
|
), "Sender (%s) must be same as requester (%s)" % (sender, requester.user)
|
|
assert self.hs.is_mine(sender), "Sender must be our own: %s" % (sender,)
|
|
else:
|
|
requester = types.create_requester(target_user)
|
|
|
|
prev_event = await self.event_creation_handler.deduplicate_state_event(
|
|
event, context
|
|
)
|
|
if prev_event is not None:
|
|
return
|
|
|
|
prev_state_ids = await context.get_prev_state_ids()
|
|
if event.membership == Membership.JOIN:
|
|
if requester.is_guest:
|
|
guest_can_join = await self._can_guest_join(prev_state_ids)
|
|
if not guest_can_join:
|
|
# This should be an auth check, but guests are a local concept,
|
|
# so don't really fit into the general auth process.
|
|
raise AuthError(403, "Guest access not allowed")
|
|
|
|
if event.membership not in (Membership.LEAVE, Membership.BAN):
|
|
is_blocked = await self.store.is_room_blocked(room_id)
|
|
if is_blocked:
|
|
raise SynapseError(403, "This room has been blocked on this server")
|
|
|
|
await self.event_creation_handler.handle_new_client_event(
|
|
requester, event, context, extra_users=[target_user], ratelimit=ratelimit
|
|
)
|
|
|
|
prev_member_event_id = prev_state_ids.get(
|
|
(EventTypes.Member, event.state_key), None
|
|
)
|
|
|
|
if event.membership == Membership.JOIN:
|
|
# Only fire user_joined_room if the user has actually joined the
|
|
# room. Don't bother if the user is just changing their profile
|
|
# info.
|
|
newly_joined = True
|
|
if prev_member_event_id:
|
|
prev_member_event = await self.store.get_event(prev_member_event_id)
|
|
newly_joined = prev_member_event.membership != Membership.JOIN
|
|
if newly_joined:
|
|
await self._user_joined_room(target_user, room_id)
|
|
elif event.membership == Membership.LEAVE:
|
|
if prev_member_event_id:
|
|
prev_member_event = await self.store.get_event(prev_member_event_id)
|
|
if prev_member_event.membership == Membership.JOIN:
|
|
await self._user_left_room(target_user, room_id)
|
|
|
|
async def _can_guest_join(self, current_state_ids: StateMap[str]) -> bool:
|
|
"""
|
|
Returns whether a guest can join a room based on its current state.
|
|
"""
|
|
guest_access_id = current_state_ids.get((EventTypes.GuestAccess, ""), None)
|
|
if not guest_access_id:
|
|
return False
|
|
|
|
guest_access = await self.store.get_event(guest_access_id)
|
|
|
|
return bool(
|
|
guest_access
|
|
and guest_access.content
|
|
and "guest_access" in guest_access.content
|
|
and guest_access.content["guest_access"] == "can_join"
|
|
)
|
|
|
|
async def lookup_room_alias(
|
|
self, room_alias: RoomAlias
|
|
) -> Tuple[RoomID, List[str]]:
|
|
"""
|
|
Get the room ID associated with a room alias.
|
|
|
|
Args:
|
|
room_alias: The alias to look up.
|
|
Returns:
|
|
A tuple of:
|
|
The room ID as a RoomID object.
|
|
Hosts likely to be participating in the room ([str]).
|
|
Raises:
|
|
SynapseError if room alias could not be found.
|
|
"""
|
|
directory_handler = self.directory_handler
|
|
mapping = await directory_handler.get_association(room_alias)
|
|
|
|
if not mapping:
|
|
raise SynapseError(404, "No such room alias")
|
|
|
|
room_id = mapping["room_id"]
|
|
servers = mapping["servers"]
|
|
|
|
# put the server which owns the alias at the front of the server list.
|
|
if room_alias.domain in servers:
|
|
servers.remove(room_alias.domain)
|
|
servers.insert(0, room_alias.domain)
|
|
|
|
return RoomID.from_string(room_id), servers
|
|
|
|
async def _get_inviter(self, user_id: str, room_id: str) -> Optional[UserID]:
|
|
invite = await self.store.get_invite_for_local_user_in_room(
|
|
user_id=user_id, room_id=room_id
|
|
)
|
|
if invite:
|
|
return UserID.from_string(invite.sender)
|
|
return None
|
|
|
|
async def do_3pid_invite(
|
|
self,
|
|
room_id: str,
|
|
inviter: UserID,
|
|
medium: str,
|
|
address: str,
|
|
id_server: str,
|
|
requester: Requester,
|
|
txn_id: Optional[str],
|
|
id_access_token: Optional[str] = None,
|
|
) -> int:
|
|
"""Invite a 3PID to a room.
|
|
|
|
Args:
|
|
room_id: The room to invite the 3PID to.
|
|
inviter: The user sending the invite.
|
|
medium: The 3PID's medium.
|
|
address: The 3PID's address.
|
|
id_server: The identity server to use.
|
|
requester: The user making the request.
|
|
txn_id: The transaction ID this is part of, or None if this is not
|
|
part of a transaction.
|
|
id_access_token: The optional identity server access token.
|
|
|
|
Returns:
|
|
The new stream ID.
|
|
|
|
Raises:
|
|
ShadowBanError if the requester has been shadow-banned.
|
|
"""
|
|
if self.config.block_non_admin_invites:
|
|
is_requester_admin = await self.auth.is_server_admin(requester.user)
|
|
if not is_requester_admin:
|
|
raise SynapseError(
|
|
403, "Invites have been disabled on this server", Codes.FORBIDDEN
|
|
)
|
|
|
|
if requester.shadow_banned:
|
|
# We randomly sleep a bit just to annoy the requester.
|
|
await self.clock.sleep(random.randint(1, 10))
|
|
raise ShadowBanError()
|
|
|
|
# We need to rate limit *before* we send out any 3PID invites, so we
|
|
# can't just rely on the standard ratelimiting of events.
|
|
await self.base_handler.ratelimit(requester)
|
|
|
|
can_invite = await self.third_party_event_rules.check_threepid_can_be_invited(
|
|
medium, address, room_id
|
|
)
|
|
if not can_invite:
|
|
raise SynapseError(
|
|
403,
|
|
"This third-party identifier can not be invited in this room",
|
|
Codes.FORBIDDEN,
|
|
)
|
|
|
|
if not self._enable_lookup:
|
|
raise SynapseError(
|
|
403, "Looking up third-party identifiers is denied from this server"
|
|
)
|
|
|
|
invitee = await self.identity_handler.lookup_3pid(
|
|
id_server, medium, address, id_access_token
|
|
)
|
|
|
|
if invitee:
|
|
# Note that update_membership with an action of "invite" can raise
|
|
# a ShadowBanError, but this was done above already.
|
|
_, stream_id = await self.update_membership(
|
|
requester, UserID.from_string(invitee), room_id, "invite", txn_id=txn_id
|
|
)
|
|
else:
|
|
stream_id = await self._make_and_store_3pid_invite(
|
|
requester,
|
|
id_server,
|
|
medium,
|
|
address,
|
|
room_id,
|
|
inviter,
|
|
txn_id=txn_id,
|
|
id_access_token=id_access_token,
|
|
)
|
|
|
|
return stream_id
|
|
|
|
async def _make_and_store_3pid_invite(
|
|
self,
|
|
requester: Requester,
|
|
id_server: str,
|
|
medium: str,
|
|
address: str,
|
|
room_id: str,
|
|
user: UserID,
|
|
txn_id: Optional[str],
|
|
id_access_token: Optional[str] = None,
|
|
) -> int:
|
|
room_state = await self.state_handler.get_current_state(room_id)
|
|
|
|
inviter_display_name = ""
|
|
inviter_avatar_url = ""
|
|
member_event = room_state.get((EventTypes.Member, user.to_string()))
|
|
if member_event:
|
|
inviter_display_name = member_event.content.get("displayname", "")
|
|
inviter_avatar_url = member_event.content.get("avatar_url", "")
|
|
|
|
# if user has no display name, default to their MXID
|
|
if not inviter_display_name:
|
|
inviter_display_name = user.to_string()
|
|
|
|
canonical_room_alias = ""
|
|
canonical_alias_event = room_state.get((EventTypes.CanonicalAlias, ""))
|
|
if canonical_alias_event:
|
|
canonical_room_alias = canonical_alias_event.content.get("alias", "")
|
|
|
|
room_name = ""
|
|
room_name_event = room_state.get((EventTypes.Name, ""))
|
|
if room_name_event:
|
|
room_name = room_name_event.content.get("name", "")
|
|
|
|
room_join_rules = ""
|
|
join_rules_event = room_state.get((EventTypes.JoinRules, ""))
|
|
if join_rules_event:
|
|
room_join_rules = join_rules_event.content.get("join_rule", "")
|
|
|
|
room_avatar_url = ""
|
|
room_avatar_event = room_state.get((EventTypes.RoomAvatar, ""))
|
|
if room_avatar_event:
|
|
room_avatar_url = room_avatar_event.content.get("url", "")
|
|
|
|
(
|
|
token,
|
|
public_keys,
|
|
fallback_public_key,
|
|
display_name,
|
|
) = await self.identity_handler.ask_id_server_for_third_party_invite(
|
|
requester=requester,
|
|
id_server=id_server,
|
|
medium=medium,
|
|
address=address,
|
|
room_id=room_id,
|
|
inviter_user_id=user.to_string(),
|
|
room_alias=canonical_room_alias,
|
|
room_avatar_url=room_avatar_url,
|
|
room_join_rules=room_join_rules,
|
|
room_name=room_name,
|
|
inviter_display_name=inviter_display_name,
|
|
inviter_avatar_url=inviter_avatar_url,
|
|
id_access_token=id_access_token,
|
|
)
|
|
|
|
(
|
|
event,
|
|
stream_id,
|
|
) = await self.event_creation_handler.create_and_send_nonmember_event(
|
|
requester,
|
|
{
|
|
"type": EventTypes.ThirdPartyInvite,
|
|
"content": {
|
|
"display_name": display_name,
|
|
"public_keys": public_keys,
|
|
# For backwards compatibility:
|
|
"key_validity_url": fallback_public_key["key_validity_url"],
|
|
"public_key": fallback_public_key["public_key"],
|
|
},
|
|
"room_id": room_id,
|
|
"sender": user.to_string(),
|
|
"state_key": token,
|
|
},
|
|
ratelimit=False,
|
|
txn_id=txn_id,
|
|
)
|
|
return stream_id
|
|
|
|
async def _is_host_in_room(self, current_state_ids: StateMap[str]) -> bool:
|
|
# Have we just created the room, and is this about to be the very
|
|
# first member event?
|
|
create_event_id = current_state_ids.get(("m.room.create", ""))
|
|
if len(current_state_ids) == 1 and create_event_id:
|
|
# We can only get here if we're in the process of creating the room
|
|
return True
|
|
|
|
for etype, state_key in current_state_ids:
|
|
if etype != EventTypes.Member or not self.hs.is_mine_id(state_key):
|
|
continue
|
|
|
|
event_id = current_state_ids[(etype, state_key)]
|
|
event = await self.store.get_event(event_id, allow_none=True)
|
|
if not event:
|
|
continue
|
|
|
|
if event.membership == Membership.JOIN:
|
|
return True
|
|
|
|
return False
|
|
|
|
async def _is_server_notice_room(self, room_id: str) -> bool:
|
|
if self._server_notices_mxid is None:
|
|
return False
|
|
user_ids = await self.store.get_users_in_room(room_id)
|
|
return self._server_notices_mxid in user_ids
|
|
|
|
|
|
class RoomMemberMasterHandler(RoomMemberHandler):
|
|
def __init__(self, hs):
|
|
super(RoomMemberMasterHandler, self).__init__(hs)
|
|
|
|
self.distributor = hs.get_distributor()
|
|
self.distributor.declare("user_joined_room")
|
|
self.distributor.declare("user_left_room")
|
|
|
|
async def _is_remote_room_too_complex(
|
|
self, room_id: str, remote_room_hosts: List[str]
|
|
) -> Optional[bool]:
|
|
"""
|
|
Check if complexity of a remote room is too great.
|
|
|
|
Args:
|
|
room_id
|
|
remote_room_hosts
|
|
|
|
Returns: bool of whether the complexity is too great, or None
|
|
if unable to be fetched
|
|
"""
|
|
max_complexity = self.hs.config.limit_remote_rooms.complexity
|
|
complexity = await self.federation_handler.get_room_complexity(
|
|
remote_room_hosts, room_id
|
|
)
|
|
|
|
if complexity:
|
|
return complexity["v1"] > max_complexity
|
|
return None
|
|
|
|
async def _is_local_room_too_complex(self, room_id: str) -> bool:
|
|
"""
|
|
Check if the complexity of a local room is too great.
|
|
|
|
Args:
|
|
room_id: The room ID to check for complexity.
|
|
"""
|
|
max_complexity = self.hs.config.limit_remote_rooms.complexity
|
|
complexity = await self.store.get_room_complexity(room_id)
|
|
|
|
return complexity["v1"] > max_complexity
|
|
|
|
async def _remote_join(
|
|
self,
|
|
requester: Requester,
|
|
remote_room_hosts: List[str],
|
|
room_id: str,
|
|
user: UserID,
|
|
content: dict,
|
|
) -> Tuple[str, int]:
|
|
"""Implements RoomMemberHandler._remote_join
|
|
"""
|
|
# filter ourselves out of remote_room_hosts: do_invite_join ignores it
|
|
# and if it is the only entry we'd like to return a 404 rather than a
|
|
# 500.
|
|
remote_room_hosts = [
|
|
host for host in remote_room_hosts if host != self.hs.hostname
|
|
]
|
|
|
|
if len(remote_room_hosts) == 0:
|
|
raise SynapseError(404, "No known servers")
|
|
|
|
check_complexity = self.hs.config.limit_remote_rooms.enabled
|
|
if check_complexity and self.hs.config.limit_remote_rooms.admins_can_join:
|
|
check_complexity = not await self.auth.is_server_admin(user)
|
|
|
|
if check_complexity:
|
|
# Fetch the room complexity
|
|
too_complex = await self._is_remote_room_too_complex(
|
|
room_id, remote_room_hosts
|
|
)
|
|
if too_complex is True:
|
|
raise SynapseError(
|
|
code=400,
|
|
msg=self.hs.config.limit_remote_rooms.complexity_error,
|
|
errcode=Codes.RESOURCE_LIMIT_EXCEEDED,
|
|
)
|
|
|
|
# We don't do an auth check if we are doing an invite
|
|
# join dance for now, since we're kinda implicitly checking
|
|
# that we are allowed to join when we decide whether or not we
|
|
# need to do the invite/join dance.
|
|
event_id, stream_id = await self.federation_handler.do_invite_join(
|
|
remote_room_hosts, room_id, user.to_string(), content
|
|
)
|
|
await self._user_joined_room(user, room_id)
|
|
|
|
# Check the room we just joined wasn't too large, if we didn't fetch the
|
|
# complexity of it before.
|
|
if check_complexity:
|
|
if too_complex is False:
|
|
# We checked, and we're under the limit.
|
|
return event_id, stream_id
|
|
|
|
# Check again, but with the local state events
|
|
too_complex = await self._is_local_room_too_complex(room_id)
|
|
|
|
if too_complex is False:
|
|
# We're under the limit.
|
|
return event_id, stream_id
|
|
|
|
# The room is too large. Leave.
|
|
requester = types.create_requester(user, None, False, False, None)
|
|
await self.update_membership(
|
|
requester=requester, target=user, room_id=room_id, action="leave"
|
|
)
|
|
raise SynapseError(
|
|
code=400,
|
|
msg=self.hs.config.limit_remote_rooms.complexity_error,
|
|
errcode=Codes.RESOURCE_LIMIT_EXCEEDED,
|
|
)
|
|
|
|
return event_id, stream_id
|
|
|
|
async def remote_reject_invite(
|
|
self,
|
|
invite_event_id: str,
|
|
txn_id: Optional[str],
|
|
requester: Requester,
|
|
content: JsonDict,
|
|
) -> Tuple[str, int]:
|
|
"""
|
|
Rejects an out-of-band invite received from a remote user
|
|
|
|
Implements RoomMemberHandler.remote_reject_invite
|
|
"""
|
|
invite_event = await self.store.get_event(invite_event_id)
|
|
room_id = invite_event.room_id
|
|
target_user = invite_event.state_key
|
|
|
|
# first of all, try doing a rejection via the inviting server
|
|
fed_handler = self.federation_handler
|
|
try:
|
|
inviter_id = UserID.from_string(invite_event.sender)
|
|
event, stream_id = await fed_handler.do_remotely_reject_invite(
|
|
[inviter_id.domain], room_id, target_user, content=content
|
|
)
|
|
return event.event_id, stream_id
|
|
except Exception as e:
|
|
# if we were unable to reject the invite, we will generate our own
|
|
# leave event.
|
|
#
|
|
# The 'except' clause is very broad, but we need to
|
|
# capture everything from DNS failures upwards
|
|
#
|
|
logger.warning("Failed to reject invite: %s", e)
|
|
|
|
return await self._locally_reject_invite(
|
|
invite_event, txn_id, requester, content
|
|
)
|
|
|
|
async def _locally_reject_invite(
|
|
self,
|
|
invite_event: EventBase,
|
|
txn_id: Optional[str],
|
|
requester: Requester,
|
|
content: JsonDict,
|
|
) -> Tuple[str, int]:
|
|
"""Generate a local invite rejection
|
|
|
|
This is called after we fail to reject an invite via a remote server. It
|
|
generates an out-of-band membership event locally.
|
|
|
|
Args:
|
|
invite_event: the invite to be rejected
|
|
txn_id: optional transaction ID supplied by the client
|
|
requester: user making the rejection request, according to the access token
|
|
content: additional content to include in the rejection event.
|
|
Normally an empty dict.
|
|
"""
|
|
|
|
room_id = invite_event.room_id
|
|
target_user = invite_event.state_key
|
|
room_version = await self.store.get_room_version(room_id)
|
|
|
|
content["membership"] = Membership.LEAVE
|
|
|
|
# the auth events for the new event are the same as that of the invite, plus
|
|
# the invite itself.
|
|
#
|
|
# the prev_events are just the invite.
|
|
invite_hash = invite_event.event_id # type: Union[str, Tuple]
|
|
if room_version.event_format == EventFormatVersions.V1:
|
|
alg, h = compute_event_reference_hash(invite_event)
|
|
invite_hash = (invite_event.event_id, {alg: encode_base64(h)})
|
|
|
|
auth_events = tuple(invite_event.auth_events) + (invite_hash,)
|
|
prev_events = (invite_hash,)
|
|
|
|
# we cap depth of generated events, to ensure that they are not
|
|
# rejected by other servers (and so that they can be persisted in
|
|
# the db)
|
|
depth = min(invite_event.depth + 1, MAX_DEPTH)
|
|
|
|
event_dict = {
|
|
"depth": depth,
|
|
"auth_events": auth_events,
|
|
"prev_events": prev_events,
|
|
"type": EventTypes.Member,
|
|
"room_id": room_id,
|
|
"sender": target_user,
|
|
"content": content,
|
|
"state_key": target_user,
|
|
}
|
|
|
|
event = create_local_event_from_event_dict(
|
|
clock=self.clock,
|
|
hostname=self.hs.hostname,
|
|
signing_key=self.hs.signing_key,
|
|
room_version=room_version,
|
|
event_dict=event_dict,
|
|
)
|
|
event.internal_metadata.outlier = True
|
|
event.internal_metadata.out_of_band_membership = True
|
|
if txn_id is not None:
|
|
event.internal_metadata.txn_id = txn_id
|
|
if requester.access_token_id is not None:
|
|
event.internal_metadata.token_id = requester.access_token_id
|
|
|
|
EventValidator().validate_new(event, self.config)
|
|
|
|
context = await self.state_handler.compute_event_context(event)
|
|
context.app_service = requester.app_service
|
|
stream_id = await self.event_creation_handler.handle_new_client_event(
|
|
requester, event, context, extra_users=[UserID.from_string(target_user)],
|
|
)
|
|
return event.event_id, stream_id
|
|
|
|
async def _user_joined_room(self, target: UserID, room_id: str) -> None:
|
|
"""Implements RoomMemberHandler._user_joined_room
|
|
"""
|
|
user_joined_room(self.distributor, target, room_id)
|
|
|
|
async def _user_left_room(self, target: UserID, room_id: str) -> None:
|
|
"""Implements RoomMemberHandler._user_left_room
|
|
"""
|
|
user_left_room(self.distributor, target, room_id)
|
|
|
|
async def forget(self, user: UserID, room_id: str) -> None:
|
|
user_id = user.to_string()
|
|
|
|
member = await self.state_handler.get_current_state(
|
|
room_id=room_id, event_type=EventTypes.Member, state_key=user_id
|
|
)
|
|
membership = member.membership if member else None
|
|
|
|
if membership is not None and membership not in [
|
|
Membership.LEAVE,
|
|
Membership.BAN,
|
|
]:
|
|
raise SynapseError(400, "User %s in room %s" % (user_id, room_id))
|
|
|
|
if membership:
|
|
await self.store.forget(user_id, room_id)
|