130 lines
3.6 KiB
Python
130 lines
3.6 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 synapse.api.constants import EventTypes
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from . import EventBase
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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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"sender",
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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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"origin",
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"origin_server_ts",
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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 == EventTypes.Member:
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add_fields("membership")
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elif event_type == EventTypes.Create:
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add_fields("creator")
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elif event_type == EventTypes.JoinRules:
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add_fields("join_rule")
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elif event_type == EventTypes.PowerLevels:
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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 == EventTypes.Aliases:
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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_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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allowed_fields["unsigned"] = {}
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if "age_ts" in event.unsigned:
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allowed_fields["unsigned"]["age_ts"] = event.unsigned["age_ts"]
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return type(event)(allowed_fields)
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def serialize_event(hs, e):
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# FIXME(erikj): To handle the case of presence events and the like
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if not isinstance(e, EventBase):
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return e
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# Should this strip out None's?
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d = {k: v for k, v in e.get_dict().items()}
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if "age_ts" in d["unsigned"]:
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now = int(hs.get_clock().time_msec())
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d["unsigned"]["age"] = now - d["unsigned"]["age_ts"]
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del d["unsigned"]["age_ts"]
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d["user_id"] = d.pop("sender", None)
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if "redacted_because" in e.unsigned:
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d["redacted_because"] = serialize_event(
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hs, e.unsigned["redacted_because"]
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)
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del d["unsigned"]["redacted_because"]
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if "redacted_by" in e.unsigned:
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d["redacted_by"] = e.unsigned["redacted_by"]
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del d["unsigned"]["redacted_by"]
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if "replaces_state" in e.unsigned:
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d["replaces_state"] = e.unsigned["replaces_state"]
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del d["unsigned"]["replaces_state"]
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if "prev_content" in e.unsigned:
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d["prev_content"] = e.unsigned["prev_content"]
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del d["unsigned"]["prev_content"]
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del d["auth_events"]
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del d["prev_events"]
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del d["hashes"]
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del d["signatures"]
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return d
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