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MatrixSynapse/synapse/api/filtering.py

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# Copyright 2015, 2016 OpenMarket Ltd
# Copyright 2017 Vector Creations Ltd
# Copyright 2018-2019 New Vector Ltd
# Copyright 2019-2021 The Matrix.org Foundation C.I.C.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import json
from typing import (
TYPE_CHECKING,
Awaitable,
Callable,
Dict,
Iterable,
List,
Optional,
Set,
TypeVar,
Union,
)
import jsonschema
from jsonschema import FormatChecker
from synapse.api.constants import EventContentFields
from synapse.api.errors import SynapseError
from synapse.api.presence import UserPresenceState
from synapse.events import EventBase
from synapse.types import JsonDict, RoomID, UserID
if TYPE_CHECKING:
from synapse.server import HomeServer
FILTER_SCHEMA = {
"additionalProperties": False,
"type": "object",
"properties": {
"limit": {"type": "number"},
"senders": {"$ref": "#/definitions/user_id_array"},
"not_senders": {"$ref": "#/definitions/user_id_array"},
# TODO: We don't limit event type values but we probably should...
# check types are valid event types
"types": {"type": "array", "items": {"type": "string"}},
"not_types": {"type": "array", "items": {"type": "string"}},
},
}
ROOM_FILTER_SCHEMA = {
"additionalProperties": False,
"type": "object",
"properties": {
"not_rooms": {"$ref": "#/definitions/room_id_array"},
"rooms": {"$ref": "#/definitions/room_id_array"},
"ephemeral": {"$ref": "#/definitions/room_event_filter"},
"include_leave": {"type": "boolean"},
"state": {"$ref": "#/definitions/room_event_filter"},
"timeline": {"$ref": "#/definitions/room_event_filter"},
"account_data": {"$ref": "#/definitions/room_event_filter"},
},
}
ROOM_EVENT_FILTER_SCHEMA = {
"additionalProperties": False,
"type": "object",
"properties": {
"limit": {"type": "number"},
"senders": {"$ref": "#/definitions/user_id_array"},
"not_senders": {"$ref": "#/definitions/user_id_array"},
"types": {"type": "array", "items": {"type": "string"}},
"not_types": {"type": "array", "items": {"type": "string"}},
"rooms": {"$ref": "#/definitions/room_id_array"},
"not_rooms": {"$ref": "#/definitions/room_id_array"},
"contains_url": {"type": "boolean"},
"lazy_load_members": {"type": "boolean"},
"include_redundant_members": {"type": "boolean"},
# Include or exclude events with the provided labels.
# cf https://github.com/matrix-org/matrix-doc/pull/2326
"org.matrix.labels": {"type": "array", "items": {"type": "string"}},
"org.matrix.not_labels": {"type": "array", "items": {"type": "string"}},
# MSC3440, filtering by event relations.
"io.element.relation_senders": {"type": "array", "items": {"type": "string"}},
"io.element.relation_types": {"type": "array", "items": {"type": "string"}},
},
}
USER_ID_ARRAY_SCHEMA = {
"type": "array",
"items": {"type": "string", "format": "matrix_user_id"},
}
ROOM_ID_ARRAY_SCHEMA = {
"type": "array",
"items": {"type": "string", "format": "matrix_room_id"},
}
USER_FILTER_SCHEMA = {
"$schema": "http://json-schema.org/draft-04/schema#",
"description": "schema for a Sync filter",
"type": "object",
"definitions": {
"room_id_array": ROOM_ID_ARRAY_SCHEMA,
"user_id_array": USER_ID_ARRAY_SCHEMA,
"filter": FILTER_SCHEMA,
"room_filter": ROOM_FILTER_SCHEMA,
"room_event_filter": ROOM_EVENT_FILTER_SCHEMA,
},
"properties": {
"presence": {"$ref": "#/definitions/filter"},
"account_data": {"$ref": "#/definitions/filter"},
"room": {"$ref": "#/definitions/room_filter"},
"event_format": {"type": "string", "enum": ["client", "federation"]},
"event_fields": {
"type": "array",
"items": {
"type": "string",
# Don't allow '\\' in event field filters. This makes matching
# events a lot easier as we can then use a negative lookbehind
# assertion to split '\.' If we allowed \\ then it would
# incorrectly split '\\.' See synapse.events.utils.serialize_event
#
# Note that because this is a regular expression, we have to escape
# each backslash in the pattern.
"pattern": r"^((?!\\\\).)*$",
},
},
},
"additionalProperties": False,
}
@FormatChecker.cls_checks("matrix_room_id")
def matrix_room_id_validator(room_id_str: str) -> RoomID:
return RoomID.from_string(room_id_str)
@FormatChecker.cls_checks("matrix_user_id")
def matrix_user_id_validator(user_id_str: str) -> UserID:
return UserID.from_string(user_id_str)
class Filtering:
def __init__(self, hs: "HomeServer"):
self._hs = hs
self.store = hs.get_datastore()
self.DEFAULT_FILTER_COLLECTION = FilterCollection(hs, {})
async def get_user_filter(
self, user_localpart: str, filter_id: Union[int, str]
) -> "FilterCollection":
result = await self.store.get_user_filter(user_localpart, filter_id)
return FilterCollection(self._hs, result)
def add_user_filter(
self, user_localpart: str, user_filter: JsonDict
) -> Awaitable[int]:
self.check_valid_filter(user_filter)
return self.store.add_user_filter(user_localpart, user_filter)
# TODO(paul): surely we should probably add a delete_user_filter or
# replace_user_filter at some point? There's no REST API specified for
# them however
def check_valid_filter(self, user_filter_json: JsonDict) -> None:
"""Check if the provided filter is valid.
This inspects all definitions contained within the filter.
Args:
user_filter_json: The filter
Raises:
SynapseError: If the filter is not valid.
"""
# NB: Filters are the complete json blobs. "Definitions" are an
# individual top-level key e.g. public_user_data. Filters are made of
# many definitions.
try:
jsonschema.validate(
user_filter_json, USER_FILTER_SCHEMA, format_checker=FormatChecker()
)
except jsonschema.ValidationError as e:
raise SynapseError(400, str(e))
# Filters work across events, presence EDUs, and account data.
FilterEvent = TypeVar("FilterEvent", EventBase, UserPresenceState, JsonDict)
class FilterCollection:
def __init__(self, hs: "HomeServer", filter_json: JsonDict):
self._filter_json = filter_json
room_filter_json = self._filter_json.get("room", {})
self._room_filter = Filter(
hs,
{k: v for k, v in room_filter_json.items() if k in ("rooms", "not_rooms")},
)
self._room_timeline_filter = Filter(hs, room_filter_json.get("timeline", {}))
self._room_state_filter = Filter(hs, room_filter_json.get("state", {}))
self._room_ephemeral_filter = Filter(hs, room_filter_json.get("ephemeral", {}))
self._room_account_data = Filter(hs, room_filter_json.get("account_data", {}))
self._presence_filter = Filter(hs, filter_json.get("presence", {}))
self._account_data = Filter(hs, filter_json.get("account_data", {}))
self.include_leave = filter_json.get("room", {}).get("include_leave", False)
self.event_fields = filter_json.get("event_fields", [])
self.event_format = filter_json.get("event_format", "client")
def __repr__(self) -> str:
return "<FilterCollection %s>" % (json.dumps(self._filter_json),)
def get_filter_json(self) -> JsonDict:
return self._filter_json
def timeline_limit(self) -> int:
return self._room_timeline_filter.limit
def presence_limit(self) -> int:
return self._presence_filter.limit
def ephemeral_limit(self) -> int:
return self._room_ephemeral_filter.limit
def lazy_load_members(self) -> bool:
return self._room_state_filter.lazy_load_members
def include_redundant_members(self) -> bool:
return self._room_state_filter.include_redundant_members
async def filter_presence(
self, events: Iterable[UserPresenceState]
) -> List[UserPresenceState]:
return await self._presence_filter.filter(events)
async def filter_account_data(self, events: Iterable[JsonDict]) -> List[JsonDict]:
return await self._account_data.filter(events)
async def filter_room_state(self, events: Iterable[EventBase]) -> List[EventBase]:
return await self._room_state_filter.filter(
await self._room_filter.filter(events)
)
async def filter_room_timeline(
self, events: Iterable[EventBase]
) -> List[EventBase]:
return await self._room_timeline_filter.filter(
await self._room_filter.filter(events)
)
async def filter_room_ephemeral(self, events: Iterable[JsonDict]) -> List[JsonDict]:
return await self._room_ephemeral_filter.filter(
await self._room_filter.filter(events)
)
async def filter_room_account_data(
self, events: Iterable[JsonDict]
) -> List[JsonDict]:
return await self._room_account_data.filter(
await self._room_filter.filter(events)
)
def blocks_all_presence(self) -> bool:
return (
self._presence_filter.filters_all_types()
or self._presence_filter.filters_all_senders()
)
def blocks_all_room_ephemeral(self) -> bool:
return (
self._room_ephemeral_filter.filters_all_types()
or self._room_ephemeral_filter.filters_all_senders()
or self._room_ephemeral_filter.filters_all_rooms()
)
def blocks_all_room_timeline(self) -> bool:
return (
self._room_timeline_filter.filters_all_types()
or self._room_timeline_filter.filters_all_senders()
or self._room_timeline_filter.filters_all_rooms()
)
class Filter:
def __init__(self, hs: "HomeServer", filter_json: JsonDict):
self._hs = hs
self._store = hs.get_datastore()
self.filter_json = filter_json
self.limit = filter_json.get("limit", 10)
self.lazy_load_members = filter_json.get("lazy_load_members", False)
self.include_redundant_members = filter_json.get(
"include_redundant_members", False
)
self.types = filter_json.get("types", None)
self.not_types = filter_json.get("not_types", [])
self.rooms = filter_json.get("rooms", None)
self.not_rooms = filter_json.get("not_rooms", [])
self.senders = filter_json.get("senders", None)
self.not_senders = filter_json.get("not_senders", [])
self.contains_url = filter_json.get("contains_url", None)
self.labels = filter_json.get("org.matrix.labels", None)
self.not_labels = filter_json.get("org.matrix.not_labels", [])
# Ideally these would be rejected at the endpoint if they were provided
# and not supported, but that would involve modifying the JSON schema
# based on the homeserver configuration.
if hs.config.experimental.msc3440_enabled:
self.relation_senders = self.filter_json.get(
"io.element.relation_senders", None
)
self.relation_types = self.filter_json.get(
"io.element.relation_types", None
)
else:
self.relation_senders = None
self.relation_types = None
def filters_all_types(self) -> bool:
return "*" in self.not_types
def filters_all_senders(self) -> bool:
return "*" in self.not_senders
def filters_all_rooms(self) -> bool:
return "*" in self.not_rooms
def _check(self, event: FilterEvent) -> bool:
"""Checks whether the filter matches the given event.
Args:
event: The event, account data, or presence to check against this
filter.
Returns:
True if the event matches the filter.
"""
# We usually get the full "events" as dictionaries coming through,
# except for presence which actually gets passed around as its own type.
if isinstance(event, UserPresenceState):
user_id = event.user_id
field_matchers = {
"senders": lambda v: user_id == v,
"types": lambda v: "m.presence" == v,
}
return self._check_fields(field_matchers)
else:
content = event.get("content")
# Content is assumed to be a dict below, so ensure it is. This should
# always be true for events, but account_data has been allowed to
# have non-dict content.
if not isinstance(content, dict):
content = {}
sender = event.get("sender", None)
if not sender:
# Presence events had their 'sender' in content.user_id, but are
# now handled above. We don't know if anything else uses this
# form. TODO: Check this and probably remove it.
sender = content.get("user_id")
room_id = event.get("room_id", None)
ev_type = event.get("type", None)
# check if there is a string url field in the content for filtering purposes
labels = content.get(EventContentFields.LABELS, [])
field_matchers = {
"rooms": lambda v: room_id == v,
"senders": lambda v: sender == v,
"types": lambda v: _matches_wildcard(ev_type, v),
"labels": lambda v: v in labels,
}
result = self._check_fields(field_matchers)
if not result:
return result
contains_url_filter = self.contains_url
if contains_url_filter is not None:
contains_url = isinstance(content.get("url"), str)
if contains_url_filter != contains_url:
return False
return True
def _check_fields(self, field_matchers: Dict[str, Callable[[str], bool]]) -> bool:
"""Checks whether the filter matches the given event fields.
Args:
field_matchers: A map of attribute name to callable to use for checking
particular fields.
The attribute name and an inverse (not_<attribute name>) must
exist on the Filter.
The callable should return true if the event's value matches the
filter's value.
Returns:
True if the event fields match
"""
for name, match_func in field_matchers.items():
# If the event matches one of the disallowed values, reject it.
not_name = "not_%s" % (name,)
disallowed_values = getattr(self, not_name)
if any(map(match_func, disallowed_values)):
return False
# Other the event does not match at least one of the allowed values,
# reject it.
allowed_values = getattr(self, name)
if allowed_values is not None:
if not any(map(match_func, allowed_values)):
return False
# Otherwise, accept it.
return True
def filter_rooms(self, room_ids: Iterable[str]) -> Set[str]:
"""Apply the 'rooms' filter to a given list of rooms.
Args:
room_ids: A list of room_ids.
Returns:
A list of room_ids that match the filter
"""
room_ids = set(room_ids)
disallowed_rooms = set(self.not_rooms)
room_ids -= disallowed_rooms
allowed_rooms = self.rooms
if allowed_rooms is not None:
room_ids &= set(allowed_rooms)
return room_ids
async def _check_event_relations(
self, events: Iterable[FilterEvent]
) -> List[FilterEvent]:
# The event IDs to check, mypy doesn't understand the ifinstance check.
event_ids = [event.event_id for event in events if isinstance(event, EventBase)] # type: ignore[attr-defined]
event_ids_to_keep = set(
await self._store.events_have_relations(
event_ids, self.relation_senders, self.relation_types
)
)
return [
event
for event in events
if not isinstance(event, EventBase) or event.event_id in event_ids_to_keep
]
async def filter(self, events: Iterable[FilterEvent]) -> List[FilterEvent]:
result = [event for event in events if self._check(event)]
if self.relation_senders or self.relation_types:
return await self._check_event_relations(result)
return result
def with_room_ids(self, room_ids: Iterable[str]) -> "Filter":
"""Returns a new filter with the given room IDs appended.
Args:
room_ids: The room_ids to add
Returns:
filter: A new filter including the given rooms and the old
filter's rooms.
"""
newFilter = Filter(self._hs, self.filter_json)
newFilter.rooms += room_ids
return newFilter
def _matches_wildcard(actual_value: Optional[str], filter_value: str) -> bool:
if filter_value.endswith("*") and isinstance(actual_value, str):
type_prefix = filter_value[:-1]
return actual_value.startswith(type_prefix)
else:
return actual_value == filter_value
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