219 lines
7.5 KiB
Python
219 lines
7.5 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2014 - 2016 OpenMarket Ltd
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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from twisted.internet import defer
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from synapse.api.constants import Membership, EventTypes
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from synapse.util.logcontext import preserve_fn, preserve_context_over_deferred
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import logging
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logger = logging.getLogger(__name__)
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VISIBILITY_PRIORITY = (
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"world_readable",
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"shared",
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"invited",
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"joined",
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)
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MEMBERSHIP_PRIORITY = (
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Membership.JOIN,
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Membership.INVITE,
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Membership.KNOCK,
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Membership.LEAVE,
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Membership.BAN,
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)
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@defer.inlineCallbacks
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def filter_events_for_clients(store, user_tuples, events, event_id_to_state):
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""" Returns dict of user_id -> list of events that user is allowed to
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see.
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Args:
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user_tuples (str, bool): (user id, is_peeking) for each user to be
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checked. is_peeking should be true if:
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* the user is not currently a member of the room, and:
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* the user has not been a member of the room since the
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given events
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events ([synapse.events.EventBase]): list of events to filter
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"""
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forgotten = yield preserve_context_over_deferred(defer.gatherResults([
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defer.maybeDeferred(
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preserve_fn(store.who_forgot_in_room),
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room_id,
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)
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for room_id in frozenset(e.room_id for e in events)
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], consumeErrors=True))
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# Set of membership event_ids that have been forgotten
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event_id_forgotten = frozenset(
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row["event_id"] for rows in forgotten for row in rows
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)
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ignore_dict_content = yield store.get_global_account_data_by_type_for_users(
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"m.ignored_user_list", user_ids=[user_id for user_id, _ in user_tuples]
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)
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# FIXME: This will explode if people upload something incorrect.
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ignore_dict = {
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user_id: frozenset(
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content.get("ignored_users", {}).keys() if content else []
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)
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for user_id, content in ignore_dict_content.items()
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}
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def allowed(event, user_id, is_peeking, ignore_list):
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"""
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Args:
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event (synapse.events.EventBase): event to check
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user_id (str)
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is_peeking (bool)
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ignore_list (list): list of users to ignore
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"""
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if not event.is_state() and event.sender in ignore_list:
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return False
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state = event_id_to_state[event.event_id]
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# get the room_visibility at the time of the event.
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visibility_event = state.get((EventTypes.RoomHistoryVisibility, ""), None)
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if visibility_event:
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visibility = visibility_event.content.get("history_visibility", "shared")
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else:
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visibility = "shared"
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if visibility not in VISIBILITY_PRIORITY:
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visibility = "shared"
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# if it was world_readable, it's easy: everyone can read it
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if visibility == "world_readable":
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return True
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# Always allow history visibility events on boundaries. This is done
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# by setting the effective visibility to the least restrictive
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# of the old vs new.
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if event.type == EventTypes.RoomHistoryVisibility:
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prev_content = event.unsigned.get("prev_content", {})
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prev_visibility = prev_content.get("history_visibility", None)
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if prev_visibility not in VISIBILITY_PRIORITY:
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prev_visibility = "shared"
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new_priority = VISIBILITY_PRIORITY.index(visibility)
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old_priority = VISIBILITY_PRIORITY.index(prev_visibility)
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if old_priority < new_priority:
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visibility = prev_visibility
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# likewise, if the event is the user's own membership event, use
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# the 'most joined' membership
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membership = None
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if event.type == EventTypes.Member and event.state_key == user_id:
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membership = event.content.get("membership", None)
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if membership not in MEMBERSHIP_PRIORITY:
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membership = "leave"
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prev_content = event.unsigned.get("prev_content", {})
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prev_membership = prev_content.get("membership", None)
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if prev_membership not in MEMBERSHIP_PRIORITY:
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prev_membership = "leave"
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# Always allow the user to see their own leave events, otherwise
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# they won't see the room disappear if they reject the invite
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if membership == "leave" and (
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prev_membership == "join" or prev_membership == "invite"
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):
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return True
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new_priority = MEMBERSHIP_PRIORITY.index(membership)
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old_priority = MEMBERSHIP_PRIORITY.index(prev_membership)
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if old_priority < new_priority:
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membership = prev_membership
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# otherwise, get the user's membership at the time of the event.
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if membership is None:
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membership_event = state.get((EventTypes.Member, user_id), None)
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if membership_event:
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if membership_event.event_id not in event_id_forgotten:
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membership = membership_event.membership
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# if the user was a member of the room at the time of the event,
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# they can see it.
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if membership == Membership.JOIN:
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return True
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if visibility == "joined":
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# we weren't a member at the time of the event, so we can't
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# see this event.
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return False
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elif visibility == "invited":
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# user can also see the event if they were *invited* at the time
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# of the event.
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return membership == Membership.INVITE
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else:
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# visibility is shared: user can also see the event if they have
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# become a member since the event
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#
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# XXX: if the user has subsequently joined and then left again,
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# ideally we would share history up to the point they left. But
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# we don't know when they left.
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return not is_peeking
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defer.returnValue({
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user_id: [
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event
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for event in events
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if allowed(event, user_id, is_peeking, ignore_dict.get(user_id, []))
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]
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for user_id, is_peeking in user_tuples
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})
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@defer.inlineCallbacks
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def filter_events_for_client(store, user_id, events, is_peeking=False):
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"""
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Check which events a user is allowed to see
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Args:
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user_id(str): user id to be checked
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events([synapse.events.EventBase]): list of events to be checked
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is_peeking(bool): should be True if:
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* the user is not currently a member of the room, and:
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* the user has not been a member of the room since the given
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events
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Returns:
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[synapse.events.EventBase]
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"""
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types = (
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(EventTypes.RoomHistoryVisibility, ""),
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(EventTypes.Member, user_id),
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)
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event_id_to_state = yield store.get_state_for_events(
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frozenset(e.event_id for e in events),
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types=types
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)
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res = yield filter_events_for_clients(
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store, [(user_id, is_peeking)], events, event_id_to_state
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)
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defer.returnValue(res.get(user_id, []))
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