774 lines
26 KiB
Python
774 lines
26 KiB
Python
# Copyright 2014-2016 OpenMarket Ltd
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# Copyright 2021 The Matrix.org Foundation C.I.C.
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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 (
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TYPE_CHECKING,
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Any,
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Callable,
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Dict,
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Iterable,
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List,
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Mapping,
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Match,
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MutableMapping,
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Optional,
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Union,
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)
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import attr
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from canonicaljson import encode_canonical_json
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from synapse.api.constants import (
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MAX_PDU_SIZE,
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EventContentFields,
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EventTypes,
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RelationTypes,
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)
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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.types import JsonDict, Requester
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from . import EventBase
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if TYPE_CHECKING:
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from synapse.handlers.relations import BundledAggregations
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# Split strings on "." but not "\." (or "\\\.").
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SPLIT_FIELD_REGEX = re.compile(r"\\*\.")
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# Find escaped characters, e.g. those with a \ in front of them.
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ESCAPE_SEQUENCE_PATTERN = re.compile(r"\\(.)")
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CANONICALJSON_MAX_INT = (2**53) - 1
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CANONICALJSON_MIN_INT = -CANONICALJSON_MAX_INT
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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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pruned_event.internal_metadata.outlier = event.internal_metadata.outlier
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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: JsonDict) -> JsonDict:
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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_server_ts",
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]
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# Earlier room versions from had additional allowed keys.
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if not room_version.updated_redaction_rules:
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allowed_keys.extend(["prev_state", "membership", "origin"])
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event_type = event_dict["type"]
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new_content = {}
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def add_fields(*fields: str) -> None:
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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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if room_version.restricted_join_rule_fix:
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add_fields(EventContentFields.AUTHORISING_USER)
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if room_version.updated_redaction_rules:
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# Preserve the signed field under third_party_invite.
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third_party_invite = event_dict["content"].get("third_party_invite")
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if isinstance(third_party_invite, collections.abc.Mapping):
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new_content["third_party_invite"] = {}
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if "signed" in third_party_invite:
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new_content["third_party_invite"]["signed"] = third_party_invite[
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"signed"
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]
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elif event_type == EventTypes.Create:
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if room_version.updated_redaction_rules:
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# MSC2176 rules state that create events cannot have their `content` redacted.
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new_content = event_dict["content"]
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elif not room_version.implicit_room_creator:
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# Some room versions give meaning to `creator`
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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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if room_version.restricted_join_rule:
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add_fields("allow")
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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.updated_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.updated_redaction_rules:
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add_fields("redacts")
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# Protect the rel_type and event_id fields under the m.relates_to field.
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if room_version.msc3389_relation_redactions:
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relates_to = event_dict["content"].get("m.relates_to")
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if isinstance(relates_to, collections.abc.Mapping):
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new_relates_to = {}
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for field in ("rel_type", "event_id"):
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if field in relates_to:
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new_relates_to[field] = relates_to[field]
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# Only include a non-empty relates_to field.
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if new_relates_to:
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new_content["m.relates_to"] = new_relates_to
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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: JsonDict = {}
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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: JsonDict, dst: JsonDict, field: List[str]) -> None:
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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: The dict to read from.
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dst: The dict to modify.
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field: 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 isinstance(
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sub_dict[sub_field], collections.abc.Mapping
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):
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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 _escape_slash(m: Match[str]) -> str:
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"""
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Replacement function; replace a backslash-backslash or backslash-dot with the
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second character. Leaves any other string alone.
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"""
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if m.group(1) in ("\\", "."):
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return m.group(1)
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return m.group(0)
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def _split_field(field: str) -> List[str]:
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"""
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Splits strings on unescaped dots and removes escaping.
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Args:
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field: A string representing a path to a field.
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Returns:
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A list of nested fields to traverse.
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"""
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# Convert the field and remove escaping:
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#
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# 1. "content.body.thing\.with\.dots"
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# 2. ["content", "body", "thing\.with\.dots"]
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# 3. ["content", "body", "thing.with.dots"]
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# Find all dots (and their preceding backslashes). If the dot is unescaped
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# then emit a new field part.
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result = []
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prev_start = 0
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for match in SPLIT_FIELD_REGEX.finditer(field):
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# If the match is an *even* number of characters than the dot was escaped.
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if len(match.group()) % 2 == 0:
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continue
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# Add a new part (up to the dot, exclusive) after escaping.
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result.append(
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ESCAPE_SEQUENCE_PATTERN.sub(
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_escape_slash, field[prev_start : match.end() - 1]
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)
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)
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prev_start = match.end()
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# Add any part of the field after the last unescaped dot. (Note that if the
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# character is a dot this correctly adds a blank string.)
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result.append(re.sub(r"\\(.)", _escape_slash, field[prev_start:]))
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return result
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def only_fields(dictionary: JsonDict, fields: List[str]) -> JsonDict:
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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 '.' or '\' character in a field name may be escaped using a '\'.
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Args:
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dictionary: The dictionary to read from.
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fields: 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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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(f) for f in fields]
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output: JsonDict = {}
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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: JsonDict) -> JsonDict:
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return d
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def format_event_for_client_v1(d: JsonDict) -> JsonDict:
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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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"knock_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: JsonDict) -> JsonDict:
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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: JsonDict) -> JsonDict:
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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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@attr.s(slots=True, frozen=True, auto_attribs=True)
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class SerializeEventConfig:
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as_client_event: bool = True
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# Function to convert from federation format to client format
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event_format: Callable[[JsonDict], JsonDict] = format_event_for_client_v1
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# The entity that requested the event. This is used to determine whether to include
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# the transaction_id in the unsigned section of the event.
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requester: Optional[Requester] = None
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# List of event fields to include. If empty, all fields will be returned.
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only_event_fields: Optional[List[str]] = None
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# Some events can have stripped room state stored in the `unsigned` field.
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# This is required for invite and knock functionality. If this option is
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# False, that state will be removed from the event before it is returned.
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# Otherwise, it will be kept.
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include_stripped_room_state: bool = False
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_DEFAULT_SERIALIZE_EVENT_CONFIG = SerializeEventConfig()
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def serialize_event(
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e: Union[JsonDict, EventBase],
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time_now_ms: int,
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*,
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config: SerializeEventConfig = _DEFAULT_SERIALIZE_EVENT_CONFIG,
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msc3970_enabled: bool = False,
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) -> JsonDict:
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"""Serialize event for clients
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Args:
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e
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time_now_ms
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config: Event serialization config
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msc3970_enabled: Whether MSC3970 is enabled. It changes whether we should
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include the `transaction_id` in the event's `unsigned` section.
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Returns:
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The serialized event dictionary.
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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 = dict(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"],
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time_now_ms,
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config=config,
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msc3970_enabled=msc3970_enabled,
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)
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# If we have a txn_id saved in the internal_metadata, we should include it in the
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# unsigned section of the event if it was sent by the same session as the one
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# requesting the event.
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txn_id: Optional[str] = getattr(e.internal_metadata, "txn_id", None)
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if txn_id is not None and config.requester is not None:
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# For the MSC3970 rules to be applied, we *need* to have the device ID in the
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# event internal metadata. Since we were not recording them before, if it hasn't
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# been recorded, we fallback to the old behaviour.
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event_device_id: Optional[str] = getattr(e.internal_metadata, "device_id", None)
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if msc3970_enabled and event_device_id is not None:
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if event_device_id == config.requester.device_id:
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d["unsigned"]["transaction_id"] = txn_id
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else:
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# The pre-MSC3970 behaviour is to only include the transaction ID if the
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# event was sent from the same access token. For regular users, we can use
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# the access token ID to determine this. For guests, we can't, but since
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# each guest only has one access token, we can just check that the event was
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# sent by the same user as the one requesting the event.
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event_token_id: Optional[int] = getattr(
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e.internal_metadata, "token_id", None
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)
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if config.requester.user.to_string() == e.sender and (
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(
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event_token_id is not None
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and config.requester.access_token_id is not None
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and event_token_id == config.requester.access_token_id
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)
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or config.requester.is_guest
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):
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d["unsigned"]["transaction_id"] = txn_id
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# invite_room_state and knock_room_state are a list of stripped room state events
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# that are meant to provide metadata about a room to an invitee/knocker. They are
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# intended to only be included in specific circumstances, such as down sync, and
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# should not be included in any other case.
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if not config.include_stripped_room_state:
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d["unsigned"].pop("invite_room_state", None)
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d["unsigned"].pop("knock_room_state", None)
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if config.as_client_event:
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d = config.event_format(d)
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# If the event is a redaction, copy the redacts field from the content to
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# top-level for backwards compatibility.
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if (
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e.type == EventTypes.Redaction
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and e.room_version.updated_redaction_rules
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and e.redacts is not None
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):
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d["redacts"] = e.redacts
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only_event_fields = config.only_event_fields
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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, *, msc3970_enabled: bool = False):
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self._msc3970_enabled = msc3970_enabled
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def serialize_event(
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self,
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event: Union[JsonDict, EventBase],
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time_now: int,
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*,
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config: SerializeEventConfig = _DEFAULT_SERIALIZE_EVENT_CONFIG,
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bundle_aggregations: Optional[Dict[str, "BundledAggregations"]] = None,
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) -> JsonDict:
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"""Serializes a single event.
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Args:
|
|
event: The event being serialized.
|
|
time_now: The current time in milliseconds
|
|
config: Event serialization config
|
|
bundle_aggregations: A map from event_id to the aggregations to be bundled
|
|
into the event.
|
|
|
|
Returns:
|
|
The serialized event
|
|
"""
|
|
# To handle the case of presence events and the like
|
|
if not isinstance(event, EventBase):
|
|
return event
|
|
|
|
serialized_event = serialize_event(
|
|
event, time_now, config=config, msc3970_enabled=self._msc3970_enabled
|
|
)
|
|
|
|
# Check if there are any bundled aggregations to include with the event.
|
|
if bundle_aggregations:
|
|
if event.event_id in bundle_aggregations:
|
|
self._inject_bundled_aggregations(
|
|
event,
|
|
time_now,
|
|
config,
|
|
bundle_aggregations,
|
|
serialized_event,
|
|
)
|
|
|
|
return serialized_event
|
|
|
|
def _inject_bundled_aggregations(
|
|
self,
|
|
event: EventBase,
|
|
time_now: int,
|
|
config: SerializeEventConfig,
|
|
bundled_aggregations: Dict[str, "BundledAggregations"],
|
|
serialized_event: JsonDict,
|
|
) -> None:
|
|
"""Potentially injects bundled aggregations into the unsigned portion of the serialized event.
|
|
|
|
Args:
|
|
event: The event being serialized.
|
|
time_now: The current time in milliseconds
|
|
config: Event serialization config
|
|
bundled_aggregations: Bundled aggregations to be injected.
|
|
A map from event_id to aggregation data. Must contain at least an
|
|
entry for `event`.
|
|
|
|
While serializing the bundled aggregations this map may be searched
|
|
again for additional events in a recursive manner.
|
|
serialized_event: The serialized event which may be modified.
|
|
"""
|
|
|
|
# We have already checked that aggregations exist for this event.
|
|
event_aggregations = bundled_aggregations[event.event_id]
|
|
|
|
# The JSON dictionary to be added under the unsigned property of the event
|
|
# being serialized.
|
|
serialized_aggregations = {}
|
|
|
|
if event_aggregations.references:
|
|
serialized_aggregations[
|
|
RelationTypes.REFERENCE
|
|
] = event_aggregations.references
|
|
|
|
if event_aggregations.replace:
|
|
# Include information about it in the relations dict.
|
|
#
|
|
# Matrix spec v1.5 (https://spec.matrix.org/v1.5/client-server-api/#server-side-aggregation-of-mreplace-relationships)
|
|
# said that we should only include the `event_id`, `origin_server_ts` and
|
|
# `sender` of the edit; however MSC3925 proposes extending it to the whole
|
|
# of the edit, which is what we do here.
|
|
serialized_aggregations[RelationTypes.REPLACE] = self.serialize_event(
|
|
event_aggregations.replace,
|
|
time_now,
|
|
config=config,
|
|
)
|
|
|
|
# Include any threaded replies to this event.
|
|
if event_aggregations.thread:
|
|
thread = event_aggregations.thread
|
|
|
|
serialized_latest_event = self.serialize_event(
|
|
thread.latest_event,
|
|
time_now,
|
|
config=config,
|
|
bundle_aggregations=bundled_aggregations,
|
|
)
|
|
|
|
thread_summary = {
|
|
"latest_event": serialized_latest_event,
|
|
"count": thread.count,
|
|
"current_user_participated": thread.current_user_participated,
|
|
}
|
|
serialized_aggregations[RelationTypes.THREAD] = thread_summary
|
|
|
|
# Include the bundled aggregations in the event.
|
|
if serialized_aggregations:
|
|
# There is likely already an "unsigned" field, but a filter might
|
|
# have stripped it off (via the event_fields option). The server is
|
|
# allowed to return additional fields, so add it back.
|
|
serialized_event.setdefault("unsigned", {}).setdefault(
|
|
"m.relations", {}
|
|
).update(serialized_aggregations)
|
|
|
|
def serialize_events(
|
|
self,
|
|
events: Iterable[Union[JsonDict, EventBase]],
|
|
time_now: int,
|
|
*,
|
|
config: SerializeEventConfig = _DEFAULT_SERIALIZE_EVENT_CONFIG,
|
|
bundle_aggregations: Optional[Dict[str, "BundledAggregations"]] = None,
|
|
) -> List[JsonDict]:
|
|
"""Serializes multiple events.
|
|
|
|
Args:
|
|
event
|
|
time_now: The current time in milliseconds
|
|
config: Event serialization config
|
|
bundle_aggregations: Whether to include the bundled aggregations for this
|
|
event. Only applies to non-state events. (State events never include
|
|
bundled aggregations.)
|
|
|
|
Returns:
|
|
The list of serialized events
|
|
"""
|
|
return [
|
|
self.serialize_event(
|
|
event,
|
|
time_now,
|
|
config=config,
|
|
bundle_aggregations=bundle_aggregations,
|
|
)
|
|
for event in events
|
|
]
|
|
|
|
|
|
_PowerLevel = Union[str, int]
|
|
PowerLevelsContent = Mapping[str, Union[_PowerLevel, Mapping[str, _PowerLevel]]]
|
|
|
|
|
|
def copy_and_fixup_power_levels_contents(
|
|
old_power_levels: PowerLevelsContent,
|
|
) -> Dict[str, Union[int, Dict[str, int]]]:
|
|
"""Copy the content of a power_levels event, unfreezing immutabledicts along the way.
|
|
|
|
We accept as input power level values which are strings, provided they represent an
|
|
integer, e.g. `"`100"` instead of 100. Such strings are converted to integers
|
|
in the returned dictionary (hence "fixup" in the function name).
|
|
|
|
Note that future room versions will outlaw such stringy power levels (see
|
|
https://github.com/matrix-org/matrix-spec/issues/853).
|
|
|
|
Raises:
|
|
TypeError if the input does not look like a valid power levels event content
|
|
"""
|
|
if not isinstance(old_power_levels, collections.abc.Mapping):
|
|
raise TypeError("Not a valid power-levels content: %r" % (old_power_levels,))
|
|
|
|
power_levels: Dict[str, Union[int, Dict[str, int]]] = {}
|
|
|
|
for k, v in old_power_levels.items():
|
|
if isinstance(v, collections.abc.Mapping):
|
|
h: Dict[str, int] = {}
|
|
power_levels[k] = h
|
|
for k1, v1 in v.items():
|
|
_copy_power_level_value_as_integer(v1, h, k1)
|
|
|
|
else:
|
|
_copy_power_level_value_as_integer(v, power_levels, k)
|
|
|
|
return power_levels
|
|
|
|
|
|
def _copy_power_level_value_as_integer(
|
|
old_value: object,
|
|
power_levels: MutableMapping[str, Any],
|
|
key: str,
|
|
) -> None:
|
|
"""Set `power_levels[key]` to the integer represented by `old_value`.
|
|
|
|
:raises TypeError: if `old_value` is neither an integer nor a base-10 string
|
|
representation of an integer.
|
|
"""
|
|
if type(old_value) is int:
|
|
power_levels[key] = old_value
|
|
return
|
|
|
|
if isinstance(old_value, str):
|
|
try:
|
|
parsed_value = int(old_value, base=10)
|
|
except ValueError:
|
|
# Fall through to the final TypeError.
|
|
pass
|
|
else:
|
|
power_levels[key] = parsed_value
|
|
return
|
|
|
|
raise TypeError(f"Invalid power_levels value for {key}: {old_value}")
|
|
|
|
|
|
def validate_canonicaljson(value: Any) -> None:
|
|
"""
|
|
Ensure that the JSON object is valid according to the rules of canonical JSON.
|
|
|
|
See the appendix section 3.1: Canonical JSON.
|
|
|
|
This rejects JSON that has:
|
|
* An integer outside the range of [-2 ^ 53 + 1, 2 ^ 53 - 1]
|
|
* Floats
|
|
* NaN, Infinity, -Infinity
|
|
"""
|
|
if type(value) is int:
|
|
if value < CANONICALJSON_MIN_INT or CANONICALJSON_MAX_INT < value:
|
|
raise SynapseError(400, "JSON integer out of range", Codes.BAD_JSON)
|
|
|
|
elif isinstance(value, float):
|
|
# Note that Infinity, -Infinity, and NaN are also considered floats.
|
|
raise SynapseError(400, "Bad JSON value: float", Codes.BAD_JSON)
|
|
|
|
elif isinstance(value, collections.abc.Mapping):
|
|
for v in value.values():
|
|
validate_canonicaljson(v)
|
|
|
|
elif isinstance(value, (list, tuple)):
|
|
for i in value:
|
|
validate_canonicaljson(i)
|
|
|
|
elif not isinstance(value, (bool, str)) and value is not None:
|
|
# Other potential JSON values (bool, None, str) are safe.
|
|
raise SynapseError(400, "Unknown JSON value", Codes.BAD_JSON)
|
|
|
|
|
|
def maybe_upsert_event_field(
|
|
event: EventBase, container: JsonDict, key: str, value: object
|
|
) -> bool:
|
|
"""Upsert an event field, but only if this doesn't make the event too large.
|
|
|
|
Returns true iff the upsert took place.
|
|
"""
|
|
if key in container:
|
|
old_value: object = container[key]
|
|
container[key] = value
|
|
# NB: here and below, we assume that passing a non-None `time_now` argument to
|
|
# get_pdu_json doesn't increase the size of the encoded result.
|
|
upsert_okay = len(encode_canonical_json(event.get_pdu_json())) <= MAX_PDU_SIZE
|
|
if not upsert_okay:
|
|
container[key] = old_value
|
|
else:
|
|
container[key] = value
|
|
upsert_okay = len(encode_canonical_json(event.get_pdu_json())) <= MAX_PDU_SIZE
|
|
if not upsert_okay:
|
|
del container[key]
|
|
|
|
return upsert_okay
|