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84 lines
2.3 KiB
Python
84 lines
2.3 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2014 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 .room import (
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RoomMemberEvent, RoomJoinRulesEvent, RoomPowerLevelsEvent,
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RoomAliasesEvent, RoomCreateEvent,
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)
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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
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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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"""
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event_type = event.type
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allowed_keys = [
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"event_id",
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"user_id",
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"room_id",
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"hashes",
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"signatures",
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"content",
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"type",
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"state_key",
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"depth",
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"prev_events",
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"prev_state",
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"auth_events",
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]
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new_content = {}
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def add_fields(*fields):
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for field in fields:
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if field in event.content:
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new_content[field] = event.content[field]
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if event_type == RoomMemberEvent.TYPE:
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add_fields("membership")
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elif event_type == RoomCreateEvent.TYPE:
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add_fields("creator")
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elif event_type == RoomJoinRulesEvent.TYPE:
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add_fields("join_rule")
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elif event_type == RoomPowerLevelsEvent.TYPE:
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add_fields(
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"users",
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"users_default",
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"events",
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"events_default",
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"events_default",
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"state_default",
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"ban",
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"kick",
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"redact",
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)
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elif event_type == RoomAliasesEvent.TYPE:
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add_fields("aliases")
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allowed_fields = {
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k: v
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for k, v in event.get_full_dict().items()
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if k in allowed_keys
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}
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allowed_fields["content"] = new_content
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return type(event)(**allowed_fields)
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