MatrixSynapse/synapse/api/events/utils.py

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# -*- coding: utf-8 -*-
# Copyright 2014 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.
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from .room import (
RoomMemberEvent, RoomJoinRulesEvent, RoomPowerLevelsEvent,
RoomAliasesEvent, RoomCreateEvent,
)
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def prune_event(event):
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""" Returns a pruned version of the given event, which removes all keys we
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
type, state_key etc.
"""
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event_type = event.type
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allowed_keys = [
"event_id",
"user_id",
"room_id",
"hashes",
"signatures",
"content",
"type",
"state_key",
"depth",
"prev_events",
"prev_state",
"auth_events",
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"origin",
"origin_server_ts",
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]
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new_content = {}
def add_fields(*fields):
for field in fields:
if field in event.content:
new_content[field] = event.content[field]
if event_type == RoomMemberEvent.TYPE:
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add_fields("membership")
elif event_type == RoomCreateEvent.TYPE:
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add_fields("creator")
elif event_type == RoomJoinRulesEvent.TYPE:
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add_fields("join_rule")
elif event_type == RoomPowerLevelsEvent.TYPE:
add_fields(
"users",
"users_default",
"events",
"events_default",
"events_default",
"state_default",
"ban",
"kick",
"redact",
)
elif event_type == RoomAliasesEvent.TYPE:
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add_fields("aliases")
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allowed_fields = {
k: v
for k, v in event.get_full_dict().items()
if k in allowed_keys
}
allowed_fields["content"] = new_content
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return type(event)(**allowed_fields)