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forked-synapse/synapse/handlers/room_member.py
Erik Johnston 28c98e51ff
Add local_current_membership table (#6655) 
Currently we rely on `current_state_events` to figure out what rooms a
user was in and their last membership event in there. However, if the
server leaves the room then the table may be cleaned up and that
information is lost. So lets add a table that separately holds that
information.
2020-01-15 14:59:33 +00:00

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# -*- coding: utf-8 -*-
# Copyright 2016 OpenMarket Ltd
# Copyright 2018 New Vector Ltd
# Copyright 2019 The Matrix.org Foundation C.I.C.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import abc
import logging
from six.moves import http_client
from twisted.internet import defer
from synapse import types
from synapse.api.constants import EventTypes, Membership
from synapse.api.errors import AuthError, Codes, SynapseError
from synapse.types import Collection, RoomID, UserID
from synapse.util.async_helpers import Linearizer
from synapse.util.distributor import user_joined_room, user_left_room
from ._base import BaseHandler
logger = logging.getLogger(__name__)
class RoomMemberHandler(object):
# TODO(paul): This handler currently contains a messy conflation of
# low-level API that works on UserID objects and so on, and REST-level
# API that takes ID strings and returns pagination chunks. These concerns
# ought to be separated out a lot better.
__metaclass__ = abc.ABCMeta
def __init__(self, hs):
"""
Args:
hs (synapse.server.HomeServer):
"""
self.hs = hs
self.store = hs.get_datastore()
self.auth = hs.get_auth()
self.state_handler = hs.get_state_handler()
self.config = hs.config
self.federation_handler = hs.get_handlers().federation_handler
self.directory_handler = hs.get_handlers().directory_handler
self.identity_handler = hs.get_handlers().identity_handler
self.registration_handler = hs.get_registration_handler()
self.profile_handler = hs.get_profile_handler()
self.event_creation_handler = hs.get_event_creation_handler()
self.member_linearizer = Linearizer(name="member")
self.clock = hs.get_clock()
self.spam_checker = hs.get_spam_checker()
self.third_party_event_rules = hs.get_third_party_event_rules()
self._server_notices_mxid = self.config.server_notices_mxid
self._enable_lookup = hs.config.enable_3pid_lookup
self.allow_per_room_profiles = self.config.allow_per_room_profiles
# This is only used to get at ratelimit function, and
# maybe_kick_guest_users. It's fine there are multiple of these as
# it doesn't store state.
self.base_handler = BaseHandler(hs)
@abc.abstractmethod
def _remote_join(self, requester, remote_room_hosts, room_id, user, content):
"""Try and join a room that this server is not in
Args:
requester (Requester)
remote_room_hosts (list[str]): List of servers that can be used
to join via.
room_id (str): Room that we are trying to join
user (UserID): User who is trying to join
content (dict): A dict that should be used as the content of the
join event.
Returns:
Deferred
"""
raise NotImplementedError()
@abc.abstractmethod
def _remote_reject_invite(
self, requester, remote_room_hosts, room_id, target, content
):
"""Attempt to reject an invite for a room this server is not in. If we
fail to do so we locally mark the invite as rejected.
Args:
requester (Requester)
remote_room_hosts (list[str]): List of servers to use to try and
reject invite
room_id (str)
target (UserID): The user rejecting the invite
content (dict): The content for the rejection event
Returns:
Deferred[dict]: A dictionary to be returned to the client, may
include event_id etc, or nothing if we locally rejected
"""
raise NotImplementedError()
@abc.abstractmethod
def _user_joined_room(self, target, room_id):
"""Notifies distributor on master process that the user has joined the
room.
Args:
target (UserID)
room_id (str)
Returns:
Deferred|None
"""
raise NotImplementedError()
@abc.abstractmethod
def _user_left_room(self, target, room_id):
"""Notifies distributor on master process that the user has left the
room.
Args:
target (UserID)
room_id (str)
Returns:
Deferred|None
"""
raise NotImplementedError()
@defer.inlineCallbacks
def _local_membership_update(
self,
requester,
target,
room_id,
membership,
prev_event_ids: Collection[str],
txn_id=None,
ratelimit=True,
content=None,
require_consent=True,
):
user_id = target.to_string()
if content is None:
content = {}
content["membership"] = membership
if requester.is_guest:
content["kind"] = "guest"
event, context = yield self.event_creation_handler.create_event(
requester,
{
"type": EventTypes.Member,
"content": content,
"room_id": room_id,
"sender": requester.user.to_string(),
"state_key": user_id,
# For backwards compatibility:
"membership": membership,
},
token_id=requester.access_token_id,
txn_id=txn_id,
prev_event_ids=prev_event_ids,
require_consent=require_consent,
)
# Check if this event matches the previous membership event for the user.
duplicate = yield self.event_creation_handler.deduplicate_state_event(
event, context
)
if duplicate is not None:
# Discard the new event since this membership change is a no-op.
return duplicate
yield self.event_creation_handler.handle_new_client_event(
requester, event, context, extra_users=[target], ratelimit=ratelimit
)
prev_state_ids = yield context.get_prev_state_ids()
prev_member_event_id = prev_state_ids.get((EventTypes.Member, user_id), 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 = yield self.store.get_event(prev_member_event_id)
newly_joined = prev_member_event.membership != Membership.JOIN
if newly_joined:
yield self._user_joined_room(target, room_id)
elif event.membership == Membership.LEAVE:
if prev_member_event_id:
prev_member_event = yield self.store.get_event(prev_member_event_id)
if prev_member_event.membership == Membership.JOIN:
yield self._user_left_room(target, room_id)
return event
@defer.inlineCallbacks
def copy_room_tags_and_direct_to_room(self, old_room_id, new_room_id, user_id):
"""Copies the tags and direct room state from one room to another.
Args:
old_room_id (str)
new_room_id (str)
user_id (str)
Returns:
Deferred[None]
"""
# Retrieve user account data for predecessor room
user_account_data, _ = yield self.store.get_account_data_for_user(user_id)
# Copy direct message state if applicable
direct_rooms = user_account_data.get("m.direct", {})
# Check which key this room is under
if isinstance(direct_rooms, dict):
for key, room_id_list in direct_rooms.items():
if old_room_id in room_id_list and new_room_id not in room_id_list:
# Add new room_id to this key
direct_rooms[key].append(new_room_id)
# Save back to user's m.direct account data
yield self.store.add_account_data_for_user(
user_id, "m.direct", direct_rooms
)
break
# Copy room tags if applicable
room_tags = yield self.store.get_tags_for_room(user_id, old_room_id)
# Copy each room tag to the new room
for tag, tag_content in room_tags.items():
yield self.store.add_tag_to_room(user_id, new_room_id, tag, tag_content)
@defer.inlineCallbacks
def update_membership(
self,
requester,
target,
room_id,
action,
txn_id=None,
remote_room_hosts=None,
third_party_signed=None,
ratelimit=True,
content=None,
require_consent=True,
):
key = (room_id,)
with (yield self.member_linearizer.queue(key)):
result = yield self._update_membership(
requester,
target,
room_id,
action,
txn_id=txn_id,
remote_room_hosts=remote_room_hosts,
third_party_signed=third_party_signed,
ratelimit=ratelimit,
content=content,
require_consent=require_consent,
)
return result
@defer.inlineCallbacks
def _update_membership(
self,
requester,
target,
room_id,
action,
txn_id=None,
remote_room_hosts=None,
third_party_signed=None,
ratelimit=True,
content=None,
require_consent=True,
):
content_specified = bool(content)
if content is None:
content = {}
else:
# We do a copy here as we potentially change some keys
# later on.
content = dict(content)
if not self.allow_per_room_profiles:
# Strip profile data, knowing that new profile data will be added to the
# event's content in event_creation_handler.create_event() using the target's
# global profile.
content.pop("displayname", None)
content.pop("avatar_url", None)
effective_membership_state = action
if action in ["kick", "unban"]:
effective_membership_state = "leave"
# if this is a join with a 3pid signature, we may need to turn a 3pid
# invite into a normal invite before we can handle the join.
if third_party_signed is not None:
yield self.federation_handler.exchange_third_party_invite(
third_party_signed["sender"],
target.to_string(),
room_id,
third_party_signed,
)
if not remote_room_hosts:
remote_room_hosts = []
if effective_membership_state not in ("leave", "ban"):
is_blocked = yield self.store.is_room_blocked(room_id)
if is_blocked:
raise SynapseError(403, "This room has been blocked on this server")
if effective_membership_state == Membership.INVITE:
# block any attempts to invite the server notices mxid
if target.to_string() == self._server_notices_mxid:
raise SynapseError(http_client.FORBIDDEN, "Cannot invite this user")
block_invite = False
if (
self._server_notices_mxid is not None
and requester.user.to_string() == self._server_notices_mxid
):
# allow the server notices mxid to send invites
is_requester_admin = True
else:
is_requester_admin = yield self.auth.is_server_admin(requester.user)
if not is_requester_admin:
if self.config.block_non_admin_invites:
logger.info(
"Blocking invite: user is not admin and non-admin "
"invites disabled"
)
block_invite = True
if not self.spam_checker.user_may_invite(
requester.user.to_string(), target.to_string(), room_id
):
logger.info("Blocking invite due to spam checker")
block_invite = True
if block_invite:
raise SynapseError(403, "Invites have been disabled on this server")
latest_event_ids = yield self.store.get_prev_events_for_room(room_id)
current_state_ids = yield self.state_handler.get_current_state_ids(
room_id, latest_event_ids=latest_event_ids
)
# TODO: Refactor into dictionary of explicitly allowed transitions
# between old and new state, with specific error messages for some
# transitions and generic otherwise
old_state_id = current_state_ids.get((EventTypes.Member, target.to_string()))
if old_state_id:
old_state = yield self.store.get_event(old_state_id, allow_none=True)
old_membership = old_state.content.get("membership") if old_state else None
if action == "unban" and old_membership != "ban":
raise SynapseError(
403,
"Cannot unban user who was not banned"
" (membership=%s)" % old_membership,
errcode=Codes.BAD_STATE,
)
if old_membership == "ban" and action != "unban":
raise SynapseError(
403,
"Cannot %s user who was banned" % (action,),
errcode=Codes.BAD_STATE,
)
if old_state:
same_content = content == old_state.content
same_membership = old_membership == effective_membership_state
same_sender = requester.user.to_string() == old_state.sender
if same_sender and same_membership and same_content:
return old_state
if old_membership in ["ban", "leave"] and action == "kick":
raise AuthError(403, "The target user is not in the room")
# we don't allow people to reject invites to the server notice
# room, but they can leave it once they are joined.
if (
old_membership == Membership.INVITE
and effective_membership_state == Membership.LEAVE
):
is_blocked = yield self._is_server_notice_room(room_id)
if is_blocked:
raise SynapseError(
http_client.FORBIDDEN,
"You cannot reject this invite",
errcode=Codes.CANNOT_LEAVE_SERVER_NOTICE_ROOM,
)
else:
if action == "kick":
raise AuthError(403, "The target user is not in the room")
is_host_in_room = yield self._is_host_in_room(current_state_ids)
if effective_membership_state == Membership.JOIN:
if requester.is_guest:
guest_can_join = yield 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:
inviter = yield 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"] = yield profile.get_displayname(target)
content["avatar_url"] = yield profile.get_avatar_url(target)
if requester.is_guest:
content["kind"] = "guest"
remote_join_response = yield 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
inviter = yield self._get_inviter(target.to_string(), room_id)
if not inviter:
raise SynapseError(404, "Not a known room")
if self.hs.is_mine(inviter):
# the inviter was on our server, but has now left. Carry on
# with the normal rejection codepath.
#
# This is a bit of a hack, because the room might still be
# active on other servers.
pass
else:
# send the rejection to the inviter's HS.
remote_room_hosts = remote_room_hosts + [inviter.domain]
res = yield self._remote_reject_invite(
requester, remote_room_hosts, room_id, target, content,
)
return res
res = yield 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,
)
return res
@defer.inlineCallbacks
def transfer_room_state_on_room_upgrade(self, old_room_id, room_id):
"""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 (str): The ID of the old room
room_id (str): The ID of the new room
Returns:
Deferred
"""
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 = yield self.store.get_users_in_room(old_room_id)
yield 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 = yield self.store.get_room(old_room_id)
if old_room and old_room["is_public"]:
yield self.store.set_room_is_public(old_room_id, False)
yield self.store.set_room_is_public(room_id, True)
# Check if any groups we own contain the predecessor room
local_group_ids = yield 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
yield self.store.add_room_to_group(group_id, room_id, old_room["is_public"])
# Remove the old room from those groups
yield self.store.remove_room_from_group(group_id, old_room_id)
@defer.inlineCallbacks
def copy_user_state_on_room_upgrade(self, old_room_id, new_room_id, user_ids):
"""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 (str): The ID of upgraded room
new_room_id (str): The ID of the new room
user_ids (Iterable[str]): User IDs to copy state for
Returns:
Deferred
"""
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
yield self.copy_room_tags_and_direct_to_room(
old_room_id, new_room_id, user_id
)
# Copy over push rules
yield 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
@defer.inlineCallbacks
def send_membership_event(self, requester, event, context, ratelimit=True):
"""
Change the membership status of a user in a room.
Args:
requester (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 (SynapseEvent): The membership event.
context: The context of the event.
ratelimit (bool): 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 = yield self.event_creation_handler.deduplicate_state_event(
event, context
)
if prev_event is not None:
return
prev_state_ids = yield context.get_prev_state_ids()
if event.membership == Membership.JOIN:
if requester.is_guest:
guest_can_join = yield 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 = yield self.store.is_room_blocked(room_id)
if is_blocked:
raise SynapseError(403, "This room has been blocked on this server")
yield 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 = yield self.store.get_event(prev_member_event_id)
newly_joined = prev_member_event.membership != Membership.JOIN
if newly_joined:
yield self._user_joined_room(target_user, room_id)
elif event.membership == Membership.LEAVE:
if prev_member_event_id:
prev_member_event = yield self.store.get_event(prev_member_event_id)
if prev_member_event.membership == Membership.JOIN:
yield self._user_left_room(target_user, room_id)
@defer.inlineCallbacks
def _can_guest_join(self, current_state_ids):
"""
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 = yield self.store.get_event(guest_access_id)
return (
guest_access
and guest_access.content
and "guest_access" in guest_access.content
and guest_access.content["guest_access"] == "can_join"
)
@defer.inlineCallbacks
def lookup_room_alias(self, room_alias):
"""
Get the room ID associated with a room alias.
Args:
room_alias (RoomAlias): 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 = yield 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
@defer.inlineCallbacks
def _get_inviter(self, user_id, room_id):
invite = yield 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)
@defer.inlineCallbacks
def do_3pid_invite(
self,
room_id,
inviter,
medium,
address,
id_server,
requester,
txn_id,
id_access_token=None,
):
if self.config.block_non_admin_invites:
is_requester_admin = yield self.auth.is_server_admin(requester.user)
if not is_requester_admin:
raise SynapseError(
403, "Invites have been disabled on this server", Codes.FORBIDDEN
)
# We need to rate limit *before* we send out any 3PID invites, so we
# can't just rely on the standard ratelimiting of events.
yield self.base_handler.ratelimit(requester)
can_invite = yield 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 = yield self.identity_handler.lookup_3pid(
id_server, medium, address, id_access_token
)
if invitee:
yield self.update_membership(
requester, UserID.from_string(invitee), room_id, "invite", txn_id=txn_id
)
else:
yield self._make_and_store_3pid_invite(
requester,
id_server,
medium,
address,
room_id,
inviter,
txn_id=txn_id,
id_access_token=id_access_token,
)
@defer.inlineCallbacks
def _make_and_store_3pid_invite(
self,
requester,
id_server,
medium,
address,
room_id,
user,
txn_id,
id_access_token=None,
):
room_state = yield 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,
) = yield 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,
)
yield 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,
)
@defer.inlineCallbacks
def _is_host_in_room(self, current_state_ids):
# 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 = yield self.store.get_event(event_id, allow_none=True)
if not event:
continue
if event.membership == Membership.JOIN:
return True
return False
@defer.inlineCallbacks
def _is_server_notice_room(self, room_id):
if self._server_notices_mxid is None:
return False
user_ids = yield 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")
@defer.inlineCallbacks
def _is_remote_room_too_complex(self, room_id, remote_room_hosts):
"""
Check if complexity of a remote room is too great.
Args:
room_id (str)
remote_room_hosts (list[str])
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 = yield self.federation_handler.get_room_complexity(
remote_room_hosts, room_id
)
if complexity:
return complexity["v1"] > max_complexity
return None
@defer.inlineCallbacks
def _is_local_room_too_complex(self, room_id):
"""
Check if the complexity of a local room is too great.
Args:
room_id (str)
Returns: bool
"""
max_complexity = self.hs.config.limit_remote_rooms.complexity
complexity = yield self.store.get_room_complexity(room_id)
return complexity["v1"] > max_complexity
@defer.inlineCallbacks
def _remote_join(self, requester, remote_room_hosts, room_id, user, content):
"""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")
if self.hs.config.limit_remote_rooms.enabled:
# Fetch the room complexity
too_complex = yield 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.
yield self.federation_handler.do_invite_join(
remote_room_hosts, room_id, user.to_string(), content
)
yield 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 self.hs.config.limit_remote_rooms.enabled:
if too_complex is False:
# We checked, and we're under the limit.
return
# Check again, but with the local state events
too_complex = yield self._is_local_room_too_complex(room_id)
if too_complex is False:
# We're under the limit.
return
# The room is too large. Leave.
requester = types.create_requester(user, None, False, None)
yield 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,
)
@defer.inlineCallbacks
def _remote_reject_invite(
self, requester, remote_room_hosts, room_id, target, content
):
"""Implements RoomMemberHandler._remote_reject_invite
"""
fed_handler = self.federation_handler
try:
ret = yield fed_handler.do_remotely_reject_invite(
remote_room_hosts, room_id, target.to_string(), content=content,
)
return ret
except Exception as e:
# if we were unable to reject the exception, just mark
# it as rejected on our end and plough ahead.
#
# The 'except' clause is very broad, but we need to
# capture everything from DNS failures upwards
#
logger.warning("Failed to reject invite: %s", e)
yield self.store.locally_reject_invite(target.to_string(), room_id)
return {}
def _user_joined_room(self, target, room_id):
"""Implements RoomMemberHandler._user_joined_room
"""
return user_joined_room(self.distributor, target, room_id)
def _user_left_room(self, target, room_id):
"""Implements RoomMemberHandler._user_left_room
"""
return user_left_room(self.distributor, target, room_id)
@defer.inlineCallbacks
def forget(self, user, room_id):
user_id = user.to_string()
member = yield 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:
yield self.store.forget(user_id, room_id)
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