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MatrixSynapse/synapse/api/filtering.py

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# -*- coding: utf-8 -*-
# Copyright 2015, 2016 OpenMarket Ltd
#
# 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.
from six import text_type
import jsonschema
from canonicaljson import json
from jsonschema import FormatChecker
from twisted.internet import defer
from synapse.api.errors import SynapseError
from synapse.storage.presence import UserPresenceState
from synapse.types import RoomID, UserID
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"
},
}
}
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):
return RoomID.from_string(room_id_str)
@FormatChecker.cls_checks('matrix_user_id')
def matrix_user_id_validator(user_id_str):
return UserID.from_string(user_id_str)
class Filtering(object):
def __init__(self, hs):
super(Filtering, self).__init__()
self.store = hs.get_datastore()
@defer.inlineCallbacks
def get_user_filter(self, user_localpart, filter_id):
result = yield self.store.get_user_filter(user_localpart, filter_id)
defer.returnValue(FilterCollection(result))
def add_user_filter(self, user_localpart, user_filter):
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):
"""Check if the provided filter is valid.
This inspects all definitions contained within the filter.
Args:
user_filter_json(dict): 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))
class FilterCollection(object):
def __init__(self, filter_json):
self._filter_json = filter_json
room_filter_json = self._filter_json.get("room", {})
self._room_filter = Filter({
k: v for k, v in room_filter_json.items()
if k in ("rooms", "not_rooms")
})
self._room_timeline_filter = Filter(room_filter_json.get("timeline", {}))
self._room_state_filter = Filter(room_filter_json.get("state", {}))
self._room_ephemeral_filter = Filter(room_filter_json.get("ephemeral", {}))
self._room_account_data = Filter(room_filter_json.get("account_data", {}))
self._presence_filter = Filter(filter_json.get("presence", {}))
self._account_data = Filter(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):
return "<FilterCollection %s>" % (json.dumps(self._filter_json),)
def get_filter_json(self):
return self._filter_json
def timeline_limit(self):
return self._room_timeline_filter.limit()
def presence_limit(self):
return self._presence_filter.limit()
def ephemeral_limit(self):
return self._room_ephemeral_filter.limit()
def lazy_load_members(self):
return self._room_state_filter.lazy_load_members()
def include_redundant_members(self):
return self._room_state_filter.include_redundant_members()
def filter_presence(self, events):
return self._presence_filter.filter(events)
def filter_account_data(self, events):
return self._account_data.filter(events)
def filter_room_state(self, events):
return self._room_state_filter.filter(self._room_filter.filter(events))
def filter_room_timeline(self, events):
return self._room_timeline_filter.filter(self._room_filter.filter(events))
def filter_room_ephemeral(self, events):
return self._room_ephemeral_filter.filter(self._room_filter.filter(events))
def filter_room_account_data(self, events):
return self._room_account_data.filter(self._room_filter.filter(events))
def blocks_all_presence(self):
return (
self._presence_filter.filters_all_types() or
self._presence_filter.filters_all_senders()
)
def blocks_all_room_ephemeral(self):
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):
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(object):
def __init__(self, filter_json):
self.filter_json = filter_json
self.types = self.filter_json.get("types", None)
self.not_types = self.filter_json.get("not_types", [])
self.rooms = self.filter_json.get("rooms", None)
self.not_rooms = self.filter_json.get("not_rooms", [])
self.senders = self.filter_json.get("senders", None)
self.not_senders = self.filter_json.get("not_senders", [])
self.contains_url = self.filter_json.get("contains_url", None)
def filters_all_types(self):
return "*" in self.not_types
def filters_all_senders(self):
return "*" in self.not_senders
def filters_all_rooms(self):
return "*" in self.not_rooms
def check(self, event):
"""Checks whether the filter matches the given event.
Returns:
bool: True if the event matches
"""
# We usually get the full "events" as dictionaries coming through,
# except for presence which actually gets passed around as its own
# namedtuple type.
if isinstance(event, UserPresenceState):
sender = event.user_id
room_id = None
ev_type = "m.presence"
contains_url = False
else:
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.
content = event.get("content")
# account_data has been allowed to have non-dict content, so
# check type first
if isinstance(content, dict):
sender = content.get("user_id")
room_id = event.get("room_id", None)
ev_type = event.get("type", None)
content = event.get("content", {})
# check if there is a string url field in the content for filtering purposes
contains_url = isinstance(content.get("url"), text_type)
return self.check_fields(
room_id,
sender,
ev_type,
contains_url,
)
def check_fields(self, room_id, sender, event_type, contains_url):
"""Checks whether the filter matches the given event fields.
Returns:
bool: True if the event fields match
"""
literal_keys = {
"rooms": lambda v: room_id == v,
"senders": lambda v: sender == v,
"types": lambda v: _matches_wildcard(event_type, v)
}
for name, match_func in literal_keys.items():
not_name = "not_%s" % (name,)
disallowed_values = getattr(self, not_name)
if any(map(match_func, disallowed_values)):
return False
allowed_values = getattr(self, name)
if allowed_values is not None:
if not any(map(match_func, allowed_values)):
return False
contains_url_filter = self.filter_json.get("contains_url")
if contains_url_filter is not None:
if contains_url_filter != contains_url:
return False
return True
def filter_rooms(self, room_ids):
"""Apply the 'rooms' filter to a given list of rooms.
Args:
room_ids (list): A list of room_ids.
Returns:
list: A list of room_ids that match the filter
"""
room_ids = set(room_ids)
disallowed_rooms = set(self.filter_json.get("not_rooms", []))
room_ids -= disallowed_rooms
allowed_rooms = self.filter_json.get("rooms", None)
if allowed_rooms is not None:
room_ids &= set(allowed_rooms)
return room_ids
def filter(self, events):
return list(filter(self.check, events))
def limit(self):
return self.filter_json.get("limit", 10)
def lazy_load_members(self):
return self.filter_json.get("lazy_load_members", False)
def include_redundant_members(self):
return self.filter_json.get("include_redundant_members", False)
def with_room_ids(self, room_ids):
"""Returns a new filter with the given room IDs appended.
Args:
room_ids (iterable[unicode]): The room_ids to add
Returns:
filter: A new filter including the given rooms and the old
filter's rooms.
"""
newFilter = Filter(self.filter_json)
newFilter.rooms += room_ids
return newFilter
def _matches_wildcard(actual_value, filter_value):
if filter_value.endswith("*"):
type_prefix = filter_value[:-1]
return actual_value.startswith(type_prefix)
else:
return actual_value == filter_value
DEFAULT_FILTER_COLLECTION = FilterCollection({})
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