mirror of
https://mau.dev/maunium/synapse.git
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285 lines
8.7 KiB
Python
285 lines
8.7 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2014-2016 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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from frozendict import frozendict
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import re
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# Split strings on "." but not "\." This uses a negative lookbehind assertion for '\'
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# (?<!stuff) matches if the current position in the string is not preceded
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# by a match for 'stuff'.
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# TODO: This is fast, but fails to handle "foo\\.bar" which should be treated as
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# the literal fields "foo\" and "bar" but will instead be treated as "foo\\.bar"
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SPLIT_FIELD_REGEX = re.compile(r'(?<!\\)\.')
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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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"membership",
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]
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event_dict = event.get_dict()
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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_dict["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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"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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elif event_type == EventTypes.RoomHistoryVisibility:
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add_fields("history_visibility")
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allowed_fields = {
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k: v
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for k, v in event_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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if "replaces_state" in event.unsigned:
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allowed_fields["unsigned"]["replaces_state"] = event.unsigned["replaces_state"]
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return type(event)(
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allowed_fields,
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internal_metadata_dict=event.internal_metadata.get_dict()
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)
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def _copy_field(src, dst, field):
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"""Copy the field in 'src' to 'dst'.
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For example, if src={"foo":{"bar":5}} and dst={}, and field=["foo","bar"]
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then dst={"foo":{"bar":5}}.
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Args:
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src(dict): The dict to read from.
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dst(dict): The dict to modify.
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field(list<str>): List of keys to drill down to in 'src'.
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"""
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if len(field) == 0: # this should be impossible
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return
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if len(field) == 1: # common case e.g. 'origin_server_ts'
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if field[0] in src:
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dst[field[0]] = src[field[0]]
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return
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# Else is a nested field e.g. 'content.body'
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# Pop the last field as that's the key to move across and we need the
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# parent dict in order to access the data. Drill down to the right dict.
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key_to_move = field.pop(-1)
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sub_dict = src
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for sub_field in field: # e.g. sub_field => "content"
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if sub_field in sub_dict and type(sub_dict[sub_field]) in [dict, frozendict]:
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sub_dict = sub_dict[sub_field]
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else:
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return
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if key_to_move not in sub_dict:
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return
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# Insert the key into the output dictionary, creating nested objects
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# as required. We couldn't do this any earlier or else we'd need to delete
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# the empty objects if the key didn't exist.
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sub_out_dict = dst
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for sub_field in field:
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sub_out_dict = sub_out_dict.setdefault(sub_field, {})
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sub_out_dict[key_to_move] = sub_dict[key_to_move]
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def only_fields(dictionary, fields):
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"""Return a new dict with only the fields in 'dictionary' which are present
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in 'fields'.
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If there are no event fields specified then all fields are included.
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The entries may include '.' charaters to indicate sub-fields.
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So ['content.body'] will include the 'body' field of the 'content' object.
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A literal '.' character in a field name may be escaped using a '\'.
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Args:
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dictionary(dict): The dictionary to read from.
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fields(list<str>): A list of fields to copy over. Only shallow refs are
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taken.
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Returns:
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dict: A new dictionary with only the given fields. If fields was empty,
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the same dictionary is returned.
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"""
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if len(fields) == 0:
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return dictionary
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# for each field, convert it:
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# ["content.body.thing\.with\.dots"] => [["content", "body", "thing\.with\.dots"]]
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split_fields = [SPLIT_FIELD_REGEX.split(f) for f in fields]
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# for each element of the output array of arrays:
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# remove escaping so we can use the right key names.
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split_fields[:] = [
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[f.replace(r'\.', r'.') for f in field_array] for field_array in split_fields
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]
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output = {}
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for field_array in split_fields:
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_copy_field(dictionary, output, field_array)
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return output
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def format_event_raw(d):
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return d
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def format_event_for_client_v1(d):
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d = format_event_for_client_v2(d)
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sender = d.get("sender")
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if sender is not None:
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d["user_id"] = sender
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copy_keys = (
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"age", "redacted_because", "replaces_state", "prev_content",
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"invite_room_state",
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)
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for key in copy_keys:
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if key in d["unsigned"]:
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d[key] = d["unsigned"][key]
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return d
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def format_event_for_client_v2(d):
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drop_keys = (
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"auth_events", "prev_events", "hashes", "signatures", "depth",
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"origin", "prev_state",
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)
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for key in drop_keys:
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d.pop(key, None)
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return d
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def format_event_for_client_v2_without_room_id(d):
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d = format_event_for_client_v2(d)
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d.pop("room_id", None)
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return d
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def serialize_event(e, time_now_ms, as_client_event=True,
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event_format=format_event_for_client_v1,
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token_id=None, only_event_fields=None, is_invite=False):
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"""Serialize event for clients
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Args:
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e (EventBase)
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time_now_ms (int)
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as_client_event (bool)
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event_format
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token_id
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only_event_fields
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is_invite (bool): Whether this is an invite that is being sent to the
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invitee
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Returns:
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dict
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"""
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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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time_now_ms = int(time_now_ms)
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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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d["unsigned"]["age"] = time_now_ms - d["unsigned"]["age_ts"]
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del d["unsigned"]["age_ts"]
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if "redacted_because" in e.unsigned:
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d["unsigned"]["redacted_because"] = serialize_event(
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e.unsigned["redacted_because"], time_now_ms,
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event_format=event_format
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)
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if token_id is not None:
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if token_id == getattr(e.internal_metadata, "token_id", None):
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txn_id = getattr(e.internal_metadata, "txn_id", None)
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if txn_id is not None:
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d["unsigned"]["transaction_id"] = txn_id
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# If this is an invite for somebody else, then we don't care about the
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# invite_room_state as that's meant solely for the invitee. Other clients
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# will already have the state since they're in the room.
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if not is_invite:
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d["unsigned"].pop("invite_room_state", None)
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if as_client_event:
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d = event_format(d)
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if only_event_fields:
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if (not isinstance(only_event_fields, list) or
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not all(isinstance(f, basestring) for f in only_event_fields)):
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raise TypeError("only_event_fields must be a list of strings")
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d = only_fields(d, only_event_fields)
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return d
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