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Handle loops in redaction events

This commit is contained in:
Richard van der Hoff 2019-07-24 22:45:35 +01:00
parent 448bcfd0f9
commit 4e97eb89e5
2 changed files with 106 additions and 60 deletions

View file

@ -483,7 +483,8 @@ class EventsWorkerStore(SQLBaseStore):
if events_to_fetch:
logger.debug("Also fetching redaction events %s", events_to_fetch)
result_map = {}
# build a map from event_id to EventBase
event_map = {}
for event_id, row in fetched_events.items():
if not row:
continue
@ -494,14 +495,37 @@ class EventsWorkerStore(SQLBaseStore):
if not allow_rejected and rejected_reason:
continue
cache_entry = yield self._get_event_from_row(
row["internal_metadata"],
row["json"],
row["redactions"],
rejected_reason=row["rejected_reason"],
format_version=row["format_version"],
d = json.loads(row["json"])
internal_metadata = json.loads(row["internal_metadata"])
format_version = row["format_version"]
if format_version is None:
# This means that we stored the event before we had the concept
# of a event format version, so it must be a V1 event.
format_version = EventFormatVersions.V1
original_ev = event_type_from_format_version(format_version)(
event_dict=d,
internal_metadata_dict=internal_metadata,
rejected_reason=rejected_reason,
)
event_map[event_id] = original_ev
# finally, we can decide whether each one nededs redacting, and build
# the cache entries.
result_map = {}
for event_id, original_ev in event_map.items():
redactions = fetched_events[event_id]["redactions"]
redacted_event = self._maybe_redact_event_row(
original_ev, redactions, event_map
)
cache_entry = _EventCacheEntry(
event=original_ev, redacted_event=redacted_event
)
self._get_event_cache.prefill((event_id,), cache_entry)
result_map[event_id] = cache_entry
return result_map
@ -615,50 +639,7 @@ class EventsWorkerStore(SQLBaseStore):
return event_dict
@defer.inlineCallbacks
def _get_event_from_row(
self, internal_metadata, js, redactions, format_version, rejected_reason=None
):
"""Parse an event row which has been read from the database
Args:
internal_metadata (str): json-encoded internal_metadata column
js (str): json-encoded event body from event_json
redactions (list[str]): a list of the events which claim to have redacted
this event, from the redactions table
format_version: (str): the 'format_version' column
rejected_reason (str|None): the reason this event was rejected, if any
Returns:
_EventCacheEntry
"""
with Measure(self._clock, "_get_event_from_row"):
d = json.loads(js)
internal_metadata = json.loads(internal_metadata)
if format_version is None:
# This means that we stored the event before we had the concept
# of a event format version, so it must be a V1 event.
format_version = EventFormatVersions.V1
original_ev = event_type_from_format_version(format_version)(
event_dict=d,
internal_metadata_dict=internal_metadata,
rejected_reason=rejected_reason,
)
redacted_event = yield self._maybe_redact_event_row(original_ev, redactions)
cache_entry = _EventCacheEntry(
event=original_ev, redacted_event=redacted_event
)
self._get_event_cache.prefill((original_ev.event_id,), cache_entry)
return cache_entry
@defer.inlineCallbacks
def _maybe_redact_event_row(self, original_ev, redactions):
def _maybe_redact_event_row(self, original_ev, redactions, event_map):
"""Given an event object and a list of possible redacting event ids,
determine whether to honour any of those redactions and if so return a redacted
event.
@ -666,6 +647,8 @@ class EventsWorkerStore(SQLBaseStore):
Args:
original_ev (EventBase):
redactions (iterable[str]): list of event ids of potential redaction events
event_map (dict[str, EventBase]): other events which have been fetched, in
which we can look up the redaaction events. Map from event id to event.
Returns:
Deferred[EventBase|None]: if the event should be redacted, a pruned
@ -675,15 +658,9 @@ class EventsWorkerStore(SQLBaseStore):
# we choose to ignore redactions of m.room.create events.
return None
if original_ev.type == "m.room.redaction":
# ... and redaction events
return None
redaction_map = yield self._get_events_from_cache_or_db(redactions)
for redaction_id in redactions:
redaction_entry = redaction_map.get(redaction_id)
if not redaction_entry:
redaction_event = event_map.get(redaction_id)
if not redaction_event or redaction_event.rejected_reason:
# we don't have the redaction event, or the redaction event was not
# authorized.
logger.debug(
@ -693,7 +670,6 @@ class EventsWorkerStore(SQLBaseStore):
)
continue
redaction_event = redaction_entry.event
if redaction_event.room_id != original_ev.room_id:
logger.debug(
"%s was redacted by %s but redaction was in a different room!",

View file

@ -17,6 +17,8 @@
from mock import Mock
from twisted.internet import defer
from synapse.api.constants import EventTypes, Membership
from synapse.api.room_versions import RoomVersions
from synapse.types import RoomID, UserID
@ -216,3 +218,71 @@ class RedactionTestCase(unittest.HomeserverTestCase):
},
event.unsigned["redacted_because"],
)
def test_circular_redaction(self):
redaction_event_id1 = "$redaction1_id:test"
redaction_event_id2 = "$redaction2_id:test"
class EventIdManglingBuilder:
def __init__(self, base_builder, event_id):
self._base_builder = base_builder
self._event_id = event_id
@defer.inlineCallbacks
def build(self, prev_event_ids):
built_event = yield self._base_builder.build(prev_event_ids)
built_event.event_id = self._event_id
built_event._event_dict["event_id"] = self._event_id
return built_event
@property
def room_id(self):
return self._base_builder.room_id
event_1, context_1 = self.get_success(
self.event_creation_handler.create_new_client_event(
EventIdManglingBuilder(
self.event_builder_factory.for_room_version(
RoomVersions.V1,
{
"type": EventTypes.Redaction,
"sender": self.u_alice.to_string(),
"room_id": self.room1.to_string(),
"content": {"reason": "test"},
"redacts": redaction_event_id2,
},
),
redaction_event_id1,
)
)
)
self.get_success(self.store.persist_event(event_1, context_1))
event_2, context_2 = self.get_success(
self.event_creation_handler.create_new_client_event(
EventIdManglingBuilder(
self.event_builder_factory.for_room_version(
RoomVersions.V1,
{
"type": EventTypes.Redaction,
"sender": self.u_alice.to_string(),
"room_id": self.room1.to_string(),
"content": {"reason": "test"},
"redacts": redaction_event_id1,
},
),
redaction_event_id2,
)
)
)
self.get_success(self.store.persist_event(event_2, context_2))
# fetch one of the redactions
fetched = self.get_success(self.store.get_event(redaction_event_id1))
# it should have been redacted
self.assertEqual(fetched.unsigned["redacted_by"], redaction_event_id2)
self.assertEqual(
fetched.unsigned["redacted_because"].event_id, redaction_event_id2
)