MatrixSynapse/synapse/handlers/_base.py

318 lines
12 KiB
Python

# -*- coding: utf-8 -*-
# Copyright 2014 - 2016 OpenMarket Ltd
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
from twisted.internet import defer
from synapse.api.errors import LimitExceededError
from synapse.api.constants import Membership, EventTypes
from synapse.types import UserID, Requester
from synapse.util.logcontext import preserve_fn
import logging
logger = logging.getLogger(__name__)
VISIBILITY_PRIORITY = (
"world_readable",
"shared",
"invited",
"joined",
)
MEMBERSHIP_PRIORITY = (
Membership.JOIN,
Membership.INVITE,
Membership.KNOCK,
Membership.LEAVE,
Membership.BAN,
)
class BaseHandler(object):
"""
Common base class for the event handlers.
Attributes:
store (synapse.storage.events.StateStore):
state_handler (synapse.state.StateHandler):
"""
def __init__(self, hs):
self.store = hs.get_datastore()
self.auth = hs.get_auth()
self.notifier = hs.get_notifier()
self.state_handler = hs.get_state_handler()
self.distributor = hs.get_distributor()
self.ratelimiter = hs.get_ratelimiter()
self.clock = hs.get_clock()
self.hs = hs
self.server_name = hs.hostname
self.event_builder_factory = hs.get_event_builder_factory()
@defer.inlineCallbacks
def filter_events_for_clients(self, user_tuples, events, event_id_to_state):
""" Returns dict of user_id -> list of events that user is allowed to
see.
Args:
user_tuples (str, bool): (user id, is_peeking) for each user to be
checked. is_peeking should be true if:
* the user is not currently a member of the room, and:
* the user has not been a member of the room since the
given events
events ([synapse.events.EventBase]): list of events to filter
"""
forgotten = yield defer.gatherResults([
preserve_fn(self.store.who_forgot_in_room)(
room_id,
)
for room_id in frozenset(e.room_id for e in events)
], consumeErrors=True)
# Set of membership event_ids that have been forgotten
event_id_forgotten = frozenset(
row["event_id"] for rows in forgotten for row in rows
)
ignore_dict_content = yield self.store.get_global_account_data_by_type_for_users(
"m.ignored_user_list", user_ids=[user_id for user_id, _ in user_tuples]
)
# FIXME: This will explode if people upload something incorrect.
ignore_dict = {
user_id: frozenset(
content.get("ignored_users", {}).keys() if content else []
)
for user_id, content in ignore_dict_content.items()
}
def allowed(event, user_id, is_peeking, ignore_list):
"""
Args:
event (synapse.events.EventBase): event to check
user_id (str)
is_peeking (bool)
ignore_list (list): list of users to ignore
"""
if not event.is_state() and event.sender in ignore_list:
return False
state = event_id_to_state[event.event_id]
# get the room_visibility at the time of the event.
visibility_event = state.get((EventTypes.RoomHistoryVisibility, ""), None)
if visibility_event:
visibility = visibility_event.content.get("history_visibility", "shared")
else:
visibility = "shared"
if visibility not in VISIBILITY_PRIORITY:
visibility = "shared"
# if it was world_readable, it's easy: everyone can read it
if visibility == "world_readable":
return True
# Always allow history visibility events on boundaries. This is done
# by setting the effective visibility to the least restrictive
# of the old vs new.
if event.type == EventTypes.RoomHistoryVisibility:
prev_content = event.unsigned.get("prev_content", {})
prev_visibility = prev_content.get("history_visibility", None)
if prev_visibility not in VISIBILITY_PRIORITY:
prev_visibility = "shared"
new_priority = VISIBILITY_PRIORITY.index(visibility)
old_priority = VISIBILITY_PRIORITY.index(prev_visibility)
if old_priority < new_priority:
visibility = prev_visibility
# likewise, if the event is the user's own membership event, use
# the 'most joined' membership
membership = None
if event.type == EventTypes.Member and event.state_key == user_id:
membership = event.content.get("membership", None)
if membership not in MEMBERSHIP_PRIORITY:
membership = "leave"
prev_content = event.unsigned.get("prev_content", {})
prev_membership = prev_content.get("membership", None)
if prev_membership not in MEMBERSHIP_PRIORITY:
prev_membership = "leave"
new_priority = MEMBERSHIP_PRIORITY.index(membership)
old_priority = MEMBERSHIP_PRIORITY.index(prev_membership)
if old_priority < new_priority:
membership = prev_membership
# otherwise, get the user's membership at the time of the event.
if membership is None:
membership_event = state.get((EventTypes.Member, user_id), None)
if membership_event:
if membership_event.event_id not in event_id_forgotten:
membership = membership_event.membership
# if the user was a member of the room at the time of the event,
# they can see it.
if membership == Membership.JOIN:
return True
if visibility == "joined":
# we weren't a member at the time of the event, so we can't
# see this event.
return False
elif visibility == "invited":
# user can also see the event if they were *invited* at the time
# of the event.
return membership == Membership.INVITE
else:
# visibility is shared: user can also see the event if they have
# become a member since the event
#
# XXX: if the user has subsequently joined and then left again,
# ideally we would share history up to the point they left. But
# we don't know when they left.
return not is_peeking
defer.returnValue({
user_id: [
event
for event in events
if allowed(event, user_id, is_peeking, ignore_dict.get(user_id, []))
]
for user_id, is_peeking in user_tuples
})
@defer.inlineCallbacks
def filter_events_for_client(self, user_id, events, is_peeking=False):
"""
Check which events a user is allowed to see
Args:
user_id(str): user id to be checked
events([synapse.events.EventBase]): list of events to be checked
is_peeking(bool): should be True if:
* the user is not currently a member of the room, and:
* the user has not been a member of the room since the given
events
Returns:
[synapse.events.EventBase]
"""
types = (
(EventTypes.RoomHistoryVisibility, ""),
(EventTypes.Member, user_id),
)
event_id_to_state = yield self.store.get_state_for_events(
frozenset(e.event_id for e in events),
types=types
)
res = yield self.filter_events_for_clients(
[(user_id, is_peeking)], events, event_id_to_state
)
defer.returnValue(res.get(user_id, []))
def ratelimit(self, requester):
time_now = self.clock.time()
allowed, time_allowed = self.ratelimiter.send_message(
requester.user.to_string(), time_now,
msg_rate_hz=self.hs.config.rc_messages_per_second,
burst_count=self.hs.config.rc_message_burst_count,
)
if not allowed:
raise LimitExceededError(
retry_after_ms=int(1000 * (time_allowed - time_now)),
)
def is_host_in_room(self, current_state):
room_members = [
(state_key, event.membership)
for ((event_type, state_key), event) in current_state.items()
if event_type == EventTypes.Member
]
if len(room_members) == 0:
# Have we just created the room, and is this about to be the very
# first member event?
create_event = current_state.get(("m.room.create", ""))
if create_event:
return True
for (state_key, membership) in room_members:
if (
self.hs.is_mine_id(state_key)
and membership == Membership.JOIN
):
return True
return False
@defer.inlineCallbacks
def maybe_kick_guest_users(self, event, current_state):
# Technically this function invalidates current_state by changing it.
# Hopefully this isn't that important to the caller.
if event.type == EventTypes.GuestAccess:
guest_access = event.content.get("guest_access", "forbidden")
if guest_access != "can_join":
yield self.kick_guest_users(current_state)
@defer.inlineCallbacks
def kick_guest_users(self, current_state):
for member_event in current_state:
try:
if member_event.type != EventTypes.Member:
continue
target_user = UserID.from_string(member_event.state_key)
if not self.hs.is_mine(target_user):
continue
if member_event.content["membership"] not in {
Membership.JOIN,
Membership.INVITE
}:
continue
if (
"kind" not in member_event.content
or member_event.content["kind"] != "guest"
):
continue
# We make the user choose to leave, rather than have the
# event-sender kick them. This is partially because we don't
# need to worry about power levels, and partially because guest
# users are a concept which doesn't hugely work over federation,
# and having homeservers have their own users leave keeps more
# of that decision-making and control local to the guest-having
# homeserver.
requester = Requester(target_user, "", True)
handler = self.hs.get_handlers().room_member_handler
yield handler.update_membership(
requester,
target_user,
member_event.room_id,
"leave",
ratelimit=False,
)
except Exception as e:
logger.warn("Error kicking guest user: %s" % (e,))