499 lines
16 KiB
Python
499 lines
16 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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import collections.abc
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import re
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from typing import Any, Mapping, Union
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from frozendict import frozendict
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from synapse.api.constants import EventTypes, RelationTypes
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from synapse.api.errors import Codes, SynapseError
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from synapse.api.room_versions import RoomVersion
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from synapse.util.async_helpers import yieldable_gather_results
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from . import EventBase
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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: 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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"""
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pruned_event_dict = prune_event_dict(event.room_version, event.get_dict())
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from . import make_event_from_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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# copy the internal fields
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pruned_event.internal_metadata.stream_ordering = (
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event.internal_metadata.stream_ordering
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)
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# Mark the event as redacted
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pruned_event.internal_metadata.redacted = True
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return pruned_event
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def prune_event_dict(room_version: RoomVersion, event_dict: dict) -> dict:
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"""Redacts the event_dict in the same way as `prune_event`, except it
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operates on dicts rather than event objects
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Returns:
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A copy of the pruned event dict
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"""
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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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"auth_events",
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"origin",
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"origin_server_ts",
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]
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# Room versions from before MSC2176 had additional allowed keys.
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if not room_version.msc2176_redaction_rules:
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allowed_keys.extend(["prev_state", "membership"])
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event_type = event_dict["type"]
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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_dict["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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# MSC2176 rules state that create events cannot be redacted.
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if room_version.msc2176_redaction_rules:
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return event_dict
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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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if room_version.msc2176_redaction_rules:
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add_fields("invite")
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elif event_type == EventTypes.Aliases and room_version.special_case_aliases_auth:
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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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elif event_type == EventTypes.Redaction and room_version.msc2176_redaction_rules:
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add_fields("redacts")
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allowed_fields = {k: v for k, v in event_dict.items() if k in allowed_keys}
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allowed_fields["content"] = new_content
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unsigned = {}
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allowed_fields["unsigned"] = unsigned
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event_unsigned = event_dict.get("unsigned", {})
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if "age_ts" in event_unsigned:
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unsigned["age_ts"] = event_unsigned["age_ts"]
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if "replaces_state" in event_unsigned:
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unsigned["replaces_state"] = event_unsigned["replaces_state"]
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return allowed_fields
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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 '.' characters 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",
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"redacted_because",
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"replaces_state",
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"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",
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"prev_events",
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"hashes",
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"signatures",
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"depth",
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"origin",
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"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(
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e,
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time_now_ms,
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as_client_event=True,
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event_format=format_event_for_client_v1,
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token_id=None,
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only_event_fields=None,
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is_invite=False,
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):
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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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d["event_id"] = e.event_id
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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, 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 not all(
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isinstance(f, str) for f in only_event_fields
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):
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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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class EventClientSerializer:
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"""Serializes events that are to be sent to clients.
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This is used for bundling extra information with any events to be sent to
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clients.
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"""
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def __init__(self, hs):
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self.store = hs.get_datastore()
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self.experimental_msc1849_support_enabled = (
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hs.config.experimental_msc1849_support_enabled
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)
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async def serialize_event(
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self, event, time_now, bundle_aggregations=True, **kwargs
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):
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"""Serializes a single event.
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Args:
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event (EventBase)
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time_now (int): The current time in milliseconds
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bundle_aggregations (bool): Whether to bundle in related events
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**kwargs: Arguments to pass to `serialize_event`
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Returns:
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dict: The serialized event
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"""
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# To handle the case of presence events and the like
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if not isinstance(event, EventBase):
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return event
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event_id = event.event_id
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serialized_event = serialize_event(event, time_now, **kwargs)
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# If MSC1849 is enabled then we need to look if there are any relations
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# we need to bundle in with the event.
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# Do not bundle relations if the event has been redacted
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if not event.internal_metadata.is_redacted() and (
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self.experimental_msc1849_support_enabled and bundle_aggregations
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):
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annotations = await self.store.get_aggregation_groups_for_event(event_id)
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references = await self.store.get_relations_for_event(
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event_id, RelationTypes.REFERENCE, direction="f"
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)
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if annotations.chunk:
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r = serialized_event["unsigned"].setdefault("m.relations", {})
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r[RelationTypes.ANNOTATION] = annotations.to_dict()
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if references.chunk:
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r = serialized_event["unsigned"].setdefault("m.relations", {})
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r[RelationTypes.REFERENCE] = references.to_dict()
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edit = None
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if event.type == EventTypes.Message:
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edit = await self.store.get_applicable_edit(event_id)
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if edit:
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# If there is an edit replace the content, preserving existing
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# relations.
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relations = event.content.get("m.relates_to")
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serialized_event["content"] = edit.content.get("m.new_content", {})
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if relations:
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serialized_event["content"]["m.relates_to"] = relations
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else:
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serialized_event["content"].pop("m.relates_to", None)
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r = serialized_event["unsigned"].setdefault("m.relations", {})
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r[RelationTypes.REPLACE] = {
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"event_id": edit.event_id,
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"origin_server_ts": edit.origin_server_ts,
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"sender": edit.sender,
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}
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return serialized_event
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def serialize_events(self, events, time_now, **kwargs):
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"""Serializes multiple events.
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Args:
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event (iter[EventBase])
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time_now (int): The current time in milliseconds
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**kwargs: Arguments to pass to `serialize_event`
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Returns:
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Deferred[list[dict]]: The list of serialized events
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"""
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return yieldable_gather_results(
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self.serialize_event, events, time_now=time_now, **kwargs
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)
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def copy_power_levels_contents(
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old_power_levels: Mapping[str, Union[int, Mapping[str, int]]]
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):
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"""Copy the content of a power_levels event, unfreezing frozendicts along the way
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Raises:
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TypeError if the input does not look like a valid power levels event content
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"""
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if not isinstance(old_power_levels, collections.abc.Mapping):
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raise TypeError("Not a valid power-levels content: %r" % (old_power_levels,))
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power_levels = {}
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for k, v in old_power_levels.items():
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if isinstance(v, int):
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power_levels[k] = v
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continue
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if isinstance(v, collections.abc.Mapping):
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power_levels[k] = h = {}
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for k1, v1 in v.items():
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# we should only have one level of nesting
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if not isinstance(v1, int):
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raise TypeError(
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"Invalid power_levels value for %s.%s: %r" % (k, k1, v1)
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)
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h[k1] = v1
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continue
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raise TypeError("Invalid power_levels value for %s: %r" % (k, v))
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return power_levels
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def validate_canonicaljson(value: Any):
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"""
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Ensure that the JSON object is valid according to the rules of canonical JSON.
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See the appendix section 3.1: Canonical JSON.
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This rejects JSON that has:
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* An integer outside the range of [-2 ^ 53 + 1, 2 ^ 53 - 1]
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* Floats
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* NaN, Infinity, -Infinity
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"""
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if isinstance(value, int):
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if value <= -(2 ** 53) or 2 ** 53 <= value:
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raise SynapseError(400, "JSON integer out of range", Codes.BAD_JSON)
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elif isinstance(value, float):
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# Note that Infinity, -Infinity, and NaN are also considered floats.
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raise SynapseError(400, "Bad JSON value: float", Codes.BAD_JSON)
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elif isinstance(value, (dict, frozendict)):
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for v in value.values():
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validate_canonicaljson(v)
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elif isinstance(value, (list, tuple)):
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for i in value:
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validate_canonicaljson(i)
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elif not isinstance(value, (bool, str)) and value is not None:
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# Other potential JSON values (bool, None, str) are safe.
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raise SynapseError(400, "Unknown JSON value", Codes.BAD_JSON)
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