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synced 2024-12-15 09:03:51 +01:00
Store room_versions in EventBase objects (#6875)
This is a bit fiddly because it all has to be done on one fell swoop: * Wherever we create a new event, pass in the room version (and check it matches the format version) * When we prune an event, use the room version of the unpruned event to create the pruned version. * When we pass an event over the replication protocol, pass the room version over alongside it, and use it when deserialising the event again.
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5 changed files with 63 additions and 32 deletions
1
changelog.d/6875.misc
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1
changelog.d/6875.misc
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@ -0,0 +1 @@
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Refactoring work in preparation for changing the event redaction algorithm.
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@ -15,9 +15,10 @@
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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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import abc
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import os
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from distutils.util import strtobool
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from typing import Optional, Type
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from typing import Dict, Optional, Type
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import six
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@ -199,15 +200,25 @@ class _EventInternalMetadata(object):
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return self._dict.get("redacted", False)
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class EventBase(object):
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class EventBase(metaclass=abc.ABCMeta):
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@property
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@abc.abstractmethod
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def format_version(self) -> int:
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"""The EventFormatVersion implemented by this event"""
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...
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def __init__(
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self,
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event_dict,
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signatures={},
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unsigned={},
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internal_metadata_dict={},
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rejected_reason=None,
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event_dict: JsonDict,
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room_version: RoomVersion,
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signatures: Dict[str, Dict[str, str]],
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unsigned: JsonDict,
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internal_metadata_dict: JsonDict,
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rejected_reason: Optional[str],
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):
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assert room_version.event_format == self.format_version
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self.room_version = room_version
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self.signatures = signatures
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self.unsigned = unsigned
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self.rejected_reason = rejected_reason
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@ -303,7 +314,13 @@ class EventBase(object):
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class FrozenEvent(EventBase):
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format_version = EventFormatVersions.V1 # All events of this type are V1
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def __init__(self, event_dict, internal_metadata_dict={}, rejected_reason=None):
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def __init__(
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self,
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event_dict: JsonDict,
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room_version: RoomVersion,
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internal_metadata_dict: JsonDict = {},
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rejected_reason: Optional[str] = None,
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):
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event_dict = dict(event_dict)
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# Signatures is a dict of dicts, and this is faster than doing a
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@ -326,8 +343,9 @@ class FrozenEvent(EventBase):
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self._event_id = event_dict["event_id"]
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super(FrozenEvent, self).__init__(
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super().__init__(
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frozen_dict,
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room_version=room_version,
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signatures=signatures,
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unsigned=unsigned,
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internal_metadata_dict=internal_metadata_dict,
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@ -352,7 +370,13 @@ class FrozenEvent(EventBase):
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class FrozenEventV2(EventBase):
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format_version = EventFormatVersions.V2 # All events of this type are V2
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def __init__(self, event_dict, internal_metadata_dict={}, rejected_reason=None):
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def __init__(
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self,
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event_dict: JsonDict,
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room_version: RoomVersion,
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internal_metadata_dict: JsonDict = {},
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rejected_reason: Optional[str] = None,
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):
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event_dict = dict(event_dict)
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# Signatures is a dict of dicts, and this is faster than doing a
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@ -377,8 +401,9 @@ class FrozenEventV2(EventBase):
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self._event_id = None
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super(FrozenEventV2, self).__init__(
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super().__init__(
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frozen_dict,
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room_version=room_version,
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signatures=signatures,
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unsigned=unsigned,
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internal_metadata_dict=internal_metadata_dict,
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@ -445,7 +470,7 @@ class FrozenEventV3(FrozenEventV2):
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return self._event_id
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def event_type_from_format_version(format_version: int) -> Type[EventBase]:
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def _event_type_from_format_version(format_version: int) -> Type[EventBase]:
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"""Returns the python type to use to construct an Event object for the
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given event format version.
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@ -474,5 +499,5 @@ def make_event_from_dict(
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rejected_reason: Optional[str] = None,
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) -> EventBase:
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"""Construct an EventBase from the given event dict"""
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event_type = event_type_from_format_version(room_version.event_format)
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return event_type(event_dict, internal_metadata_dict, rejected_reason)
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event_type = _event_type_from_format_version(room_version.event_format)
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return event_type(event_dict, room_version, internal_metadata_dict, rejected_reason)
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@ -35,26 +35,20 @@ from . import EventBase
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SPLIT_FIELD_REGEX = re.compile(r"(?<!\\)\.")
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def prune_event(event):
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def prune_event(event: EventBase) -> EventBase:
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""" Returns a pruned version of the given event, which removes all keys we
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don't know about or think could potentially be dodgy.
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This is used when we "redact" an event. We want to remove all fields that
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the user has specified, but we do want to keep necessary information like
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type, state_key etc.
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Args:
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event (FrozenEvent)
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Returns:
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FrozenEvent
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"""
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pruned_event_dict = prune_event_dict(event.get_dict())
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from . import event_type_from_format_version
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from . import make_event_from_dict
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pruned_event = event_type_from_format_version(event.format_version)(
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pruned_event_dict, event.internal_metadata.get_dict()
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pruned_event = make_event_from_dict(
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pruned_event_dict, event.room_version, event.internal_metadata.get_dict()
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)
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# Mark the event as redacted
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@ -18,7 +18,7 @@ import logging
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from twisted.internet import defer
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from synapse.api.room_versions import KNOWN_ROOM_VERSIONS
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from synapse.events import event_type_from_format_version
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from synapse.events import make_event_from_dict
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from synapse.events.snapshot import EventContext
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from synapse.http.servlet import parse_json_object_from_request
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from synapse.replication.http._base import ReplicationEndpoint
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@ -38,6 +38,9 @@ class ReplicationFederationSendEventsRestServlet(ReplicationEndpoint):
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{
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"events": [{
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"event": { .. serialized event .. },
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"room_version": .., // "1", "2", "3", etc: the version of the room
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// containing the event
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"event_format_version": .., // 1,2,3 etc: the event format version
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"internal_metadata": { .. serialized internal_metadata .. },
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"rejected_reason": .., // The event.rejected_reason field
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"context": { .. serialized event context .. },
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@ -73,6 +76,7 @@ class ReplicationFederationSendEventsRestServlet(ReplicationEndpoint):
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event_payloads.append(
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{
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"event": event.get_pdu_json(),
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"room_version": event.room_version.identifier,
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"event_format_version": event.format_version,
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"internal_metadata": event.internal_metadata.get_dict(),
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"rejected_reason": event.rejected_reason,
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@ -95,12 +99,13 @@ class ReplicationFederationSendEventsRestServlet(ReplicationEndpoint):
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event_and_contexts = []
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for event_payload in event_payloads:
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event_dict = event_payload["event"]
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format_ver = event_payload["event_format_version"]
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room_ver = KNOWN_ROOM_VERSIONS[event_payload["room_version"]]
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internal_metadata = event_payload["internal_metadata"]
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rejected_reason = event_payload["rejected_reason"]
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EventType = event_type_from_format_version(format_ver)
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event = EventType(event_dict, internal_metadata, rejected_reason)
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event = make_event_from_dict(
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event_dict, room_ver, internal_metadata, rejected_reason
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)
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context = EventContext.deserialize(
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self.storage, event_payload["context"]
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@ -17,7 +17,8 @@ import logging
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from twisted.internet import defer
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from synapse.events import event_type_from_format_version
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from synapse.api.room_versions import KNOWN_ROOM_VERSIONS
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from synapse.events import make_event_from_dict
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from synapse.events.snapshot import EventContext
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from synapse.http.servlet import parse_json_object_from_request
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from synapse.replication.http._base import ReplicationEndpoint
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@ -37,6 +38,9 @@ class ReplicationSendEventRestServlet(ReplicationEndpoint):
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{
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"event": { .. serialized event .. },
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"room_version": .., // "1", "2", "3", etc: the version of the room
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// containing the event
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"event_format_version": .., // 1,2,3 etc: the event format version
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"internal_metadata": { .. serialized internal_metadata .. },
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"rejected_reason": .., // The event.rejected_reason field
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"context": { .. serialized event context .. },
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payload = {
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"event": event.get_pdu_json(),
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"room_version": event.room_version.identifier,
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"event_format_version": event.format_version,
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"internal_metadata": event.internal_metadata.get_dict(),
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"rejected_reason": event.rejected_reason,
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content = parse_json_object_from_request(request)
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event_dict = content["event"]
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format_ver = content["event_format_version"]
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room_ver = KNOWN_ROOM_VERSIONS[content["room_version"]]
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internal_metadata = content["internal_metadata"]
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rejected_reason = content["rejected_reason"]
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EventType = event_type_from_format_version(format_ver)
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event = EventType(event_dict, internal_metadata, rejected_reason)
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event = make_event_from_dict(
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event_dict, room_ver, internal_metadata, rejected_reason
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)
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requester = Requester.deserialize(self.store, content["requester"])
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context = EventContext.deserialize(self.storage, content["context"])
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