diff options
Diffstat (limited to 'synapse/visibility.py')
| -rw-r--r-- | synapse/visibility.py | 163 |
1 files changed, 83 insertions, 80 deletions
diff --git a/synapse/visibility.py b/synapse/visibility.py index aaca2c584c..65d79cf0d0 100644 --- a/synapse/visibility.py +++ b/synapse/visibility.py @@ -12,15 +12,17 @@ # 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 itertools +import logging +import operator from twisted.internet import defer -from synapse.api.constants import Membership, EventTypes - -from synapse.util.logcontext import make_deferred_yieldable, preserve_fn - -import logging - +from synapse.api.constants import EventTypes, Membership +from synapse.events.utils import prune_event +from synapse.util.logcontext import ( + make_deferred_yieldable, preserve_fn, +) logger = logging.getLogger(__name__) @@ -43,21 +45,35 @@ MEMBERSHIP_PRIORITY = ( @defer.inlineCallbacks -def filter_events_for_clients(store, user_tuples, events, event_id_to_state, - always_include_ids=frozenset()): - """ Returns dict of user_id -> list of events that user is allowed to - see. +def filter_events_for_client(store, user_id, events, is_peeking=False, + always_include_ids=frozenset()): + """ + Check which events a 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 + store (synapse.storage.DataStore): our datastore (can also be a worker + store) + user_id(str): user id to be checked + events(list[synapse.events.EventBase]): sequence 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 always_include_ids (set(event_id)): set of event ids to specifically include (unless sender is ignored) + + Returns: + Deferred[list[synapse.events.EventBase]] """ + types = ( + (EventTypes.RoomHistoryVisibility, ""), + (EventTypes.Member, user_id), + ) + event_id_to_state = yield store.get_state_for_events( + frozenset(e.event_id for e in events), + types=types, + ) + forgotten = yield make_deferred_yieldable(defer.gatherResults([ defer.maybeDeferred( preserve_fn(store.who_forgot_in_room), @@ -71,31 +87,37 @@ def filter_events_for_clients(store, user_tuples, events, event_id_to_state, row["event_id"] for rows in forgotten for row in rows ) - ignore_dict_content = yield store.get_global_account_data_by_type_for_users( - "m.ignored_user_list", user_ids=[user_id for user_id, _ in user_tuples] + ignore_dict_content = yield store.get_global_account_data_by_type_for_user( + "m.ignored_user_list", user_id, ) # 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() - } + ignore_list = frozenset( + ignore_dict_content.get("ignored_users", {}).keys() + if ignore_dict_content else [] + ) + + erased_senders = yield store.are_users_erased((e.sender for e in events)) - def allowed(event, user_id, is_peeking, ignore_list): + def allowed(event): """ Args: event (synapse.events.EventBase): event to check - user_id (str) - is_peeking (bool) - ignore_list (list): list of users to ignore + + Returns: + None|EventBase: + None if the user cannot see this event at all + + a redacted copy of the event if they can only see a redacted + version + + the original event if they can see it as normal. """ if not event.is_state() and event.sender in ignore_list: - return False + return None if event.event_id in always_include_ids: - return True + return event state = event_id_to_state[event.event_id] @@ -109,10 +131,6 @@ def filter_events_for_clients(store, user_tuples, events, event_id_to_state, 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. @@ -146,7 +164,7 @@ def filter_events_for_clients(store, user_tuples, events, event_id_to_state, if membership == "leave" and ( prev_membership == "join" or prev_membership == "invite" ): - return True + return event new_priority = MEMBERSHIP_PRIORITY.index(membership) old_priority = MEMBERSHIP_PRIORITY.index(prev_membership) @@ -157,70 +175,55 @@ def filter_events_for_clients(store, user_tuples, events, event_id_to_state, if membership is None: membership_event = state.get((EventTypes.Member, user_id), None) if membership_event: + # XXX why do we do this? + # https://github.com/matrix-org/synapse/issues/3350 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 + return event + + # otherwise, it depends on the room visibility. if visibility == "joined": # we weren't a member at the time of the event, so we can't # see this event. - return False + return None 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 + return ( + event if membership == Membership.INVITE else None + ) + + elif visibility == "shared" and is_peeking: + # if the visibility is shared, users cannot see the event unless + # they have *subequently* joined the room (or were members at the + # time, of course) # # 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 + # we don't know when they left. We just treat it as though they + # never joined, and restrict access. + return None - 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 - }) + # the visibility is either shared or world_readable, and the user was + # not a member at the time. We allow it, provided the original sender + # has not requested their data to be erased, in which case, we return + # a redacted version. + if erased_senders[event.sender]: + return prune_event(event) + return event -@defer.inlineCallbacks -def filter_events_for_client(store, user_id, events, is_peeking=False, - always_include_ids=frozenset()): - """ - Check which events a user is allowed to see + # check each event: gives an iterable[None|EventBase] + filtered_events = itertools.imap(allowed, events) - 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 + # remove the None entries + filtered_events = filter(operator.truth, filtered_events) - Returns: - [synapse.events.EventBase] - """ - types = ( - (EventTypes.RoomHistoryVisibility, ""), - (EventTypes.Member, user_id), - ) - event_id_to_state = yield store.get_state_for_events( - frozenset(e.event_id for e in events), - types=types - ) - res = yield filter_events_for_clients( - store, [(user_id, is_peeking)], events, event_id_to_state, - always_include_ids=always_include_ids, - ) - defer.returnValue(res.get(user_id, [])) + # we turn it into a list before returning it. + defer.returnValue(list(filtered_events)) |