308 lines
11 KiB
Python
308 lines
11 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2015, 2016 OpenMarket Ltd
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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from synapse.api.errors import SynapseError
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from synapse.types import UserID, RoomID
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from twisted.internet import defer
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import ujson as json
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class Filtering(object):
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def __init__(self, hs):
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super(Filtering, self).__init__()
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self.store = hs.get_datastore()
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@defer.inlineCallbacks
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def get_user_filter(self, user_localpart, filter_id):
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result = yield self.store.get_user_filter(user_localpart, filter_id)
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defer.returnValue(FilterCollection(result))
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def add_user_filter(self, user_localpart, user_filter):
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self.check_valid_filter(user_filter)
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return self.store.add_user_filter(user_localpart, user_filter)
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# TODO(paul): surely we should probably add a delete_user_filter or
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# replace_user_filter at some point? There's no REST API specified for
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# them however
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def check_valid_filter(self, user_filter_json):
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"""Check if the provided filter is valid.
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This inspects all definitions contained within the filter.
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Args:
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user_filter_json(dict): The filter
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Raises:
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SynapseError: If the filter is not valid.
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"""
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# NB: Filters are the complete json blobs. "Definitions" are an
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# individual top-level key e.g. public_user_data. Filters are made of
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# many definitions.
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top_level_definitions = [
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"presence", "account_data"
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]
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room_level_definitions = [
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"state", "timeline", "ephemeral", "account_data"
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]
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for key in top_level_definitions:
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if key in user_filter_json:
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self._check_definition(user_filter_json[key])
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if "room" in user_filter_json:
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self._check_definition_room_lists(user_filter_json["room"])
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for key in room_level_definitions:
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if key in user_filter_json["room"]:
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self._check_definition(user_filter_json["room"][key])
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if "event_fields" in user_filter_json:
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if type(user_filter_json["event_fields"]) != list:
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raise SynapseError(400, "event_fields must be a list of strings")
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for field in user_filter_json["event_fields"]:
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if not isinstance(field, basestring):
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raise SynapseError(400, "Event field must be a string")
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# Don't allow '\\' in event field filters. This makes matching
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# events a lot easier as we can then use a negative lookbehind
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# assertion to split '\.' If we allowed \\ then it would
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# incorrectly split '\\.' See synapse.events.utils.serialize_event
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if r'\\' in field:
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raise SynapseError(
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400, r'The escape character \ cannot itself be escaped'
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)
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def _check_definition_room_lists(self, definition):
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"""Check that "rooms" and "not_rooms" are lists of room ids if they
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are present
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Args:
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definition(dict): The filter definition
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Raises:
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SynapseError: If there was a problem with this definition.
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"""
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# check rooms are valid room IDs
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room_id_keys = ["rooms", "not_rooms"]
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for key in room_id_keys:
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if key in definition:
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if type(definition[key]) != list:
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raise SynapseError(400, "Expected %s to be a list." % key)
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for room_id in definition[key]:
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RoomID.from_string(room_id)
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def _check_definition(self, definition):
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"""Check if the provided definition is valid.
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This inspects not only the types but also the values to make sure they
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make sense.
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Args:
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definition(dict): The filter definition
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Raises:
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SynapseError: If there was a problem with this definition.
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"""
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# NB: Filters are the complete json blobs. "Definitions" are an
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# individual top-level key e.g. public_user_data. Filters are made of
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# many definitions.
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if type(definition) != dict:
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raise SynapseError(
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400, "Expected JSON object, not %s" % (definition,)
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)
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self._check_definition_room_lists(definition)
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# check senders are valid user IDs
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user_id_keys = ["senders", "not_senders"]
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for key in user_id_keys:
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if key in definition:
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if type(definition[key]) != list:
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raise SynapseError(400, "Expected %s to be a list." % key)
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for user_id in definition[key]:
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UserID.from_string(user_id)
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# TODO: We don't limit event type values but we probably should...
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# check types are valid event types
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event_keys = ["types", "not_types"]
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for key in event_keys:
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if key in definition:
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if type(definition[key]) != list:
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raise SynapseError(400, "Expected %s to be a list." % key)
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for event_type in definition[key]:
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if not isinstance(event_type, basestring):
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raise SynapseError(400, "Event type should be a string")
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class FilterCollection(object):
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def __init__(self, filter_json):
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self._filter_json = filter_json
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room_filter_json = self._filter_json.get("room", {})
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self._room_filter = Filter({
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k: v for k, v in room_filter_json.items()
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if k in ("rooms", "not_rooms")
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})
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self._room_timeline_filter = Filter(room_filter_json.get("timeline", {}))
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self._room_state_filter = Filter(room_filter_json.get("state", {}))
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self._room_ephemeral_filter = Filter(room_filter_json.get("ephemeral", {}))
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self._room_account_data = Filter(room_filter_json.get("account_data", {}))
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self._presence_filter = Filter(filter_json.get("presence", {}))
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self._account_data = Filter(filter_json.get("account_data", {}))
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self.include_leave = filter_json.get("room", {}).get(
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"include_leave", False
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)
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self.event_fields = filter_json.get("event_fields", [])
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def __repr__(self):
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return "<FilterCollection %s>" % (json.dumps(self._filter_json),)
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def get_filter_json(self):
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return self._filter_json
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def timeline_limit(self):
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return self._room_timeline_filter.limit()
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def presence_limit(self):
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return self._presence_filter.limit()
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def ephemeral_limit(self):
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return self._room_ephemeral_filter.limit()
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def filter_presence(self, events):
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return self._presence_filter.filter(events)
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def filter_account_data(self, events):
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return self._account_data.filter(events)
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def filter_room_state(self, events):
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return self._room_state_filter.filter(self._room_filter.filter(events))
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def filter_room_timeline(self, events):
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return self._room_timeline_filter.filter(self._room_filter.filter(events))
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def filter_room_ephemeral(self, events):
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return self._room_ephemeral_filter.filter(self._room_filter.filter(events))
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def filter_room_account_data(self, events):
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return self._room_account_data.filter(self._room_filter.filter(events))
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class Filter(object):
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def __init__(self, filter_json):
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self.filter_json = filter_json
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self.types = self.filter_json.get("types", None)
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self.not_types = self.filter_json.get("not_types", [])
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self.rooms = self.filter_json.get("rooms", None)
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self.not_rooms = self.filter_json.get("not_rooms", [])
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self.senders = self.filter_json.get("senders", None)
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self.not_senders = self.filter_json.get("not_senders", [])
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self.contains_url = self.filter_json.get("contains_url", None)
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def check(self, event):
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"""Checks whether the filter matches the given event.
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Returns:
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bool: True if the event matches
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"""
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sender = event.get("sender", None)
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if not sender:
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# Presence events have their 'sender' in content.user_id
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content = event.get("content")
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# account_data has been allowed to have non-dict content, so check type first
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if isinstance(content, dict):
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sender = content.get("user_id")
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return self.check_fields(
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event.get("room_id", None),
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sender,
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event.get("type", None),
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"url" in event.get("content", {})
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)
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def check_fields(self, room_id, sender, event_type, contains_url):
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"""Checks whether the filter matches the given event fields.
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Returns:
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bool: True if the event fields match
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"""
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literal_keys = {
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"rooms": lambda v: room_id == v,
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"senders": lambda v: sender == v,
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"types": lambda v: _matches_wildcard(event_type, v)
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}
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for name, match_func in literal_keys.items():
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not_name = "not_%s" % (name,)
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disallowed_values = getattr(self, not_name)
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if any(map(match_func, disallowed_values)):
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return False
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allowed_values = getattr(self, name)
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if allowed_values is not None:
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if not any(map(match_func, allowed_values)):
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return False
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contains_url_filter = self.filter_json.get("contains_url")
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if contains_url_filter is not None:
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if contains_url_filter != contains_url:
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return False
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return True
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def filter_rooms(self, room_ids):
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"""Apply the 'rooms' filter to a given list of rooms.
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Args:
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room_ids (list): A list of room_ids.
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Returns:
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list: A list of room_ids that match the filter
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"""
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room_ids = set(room_ids)
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disallowed_rooms = set(self.filter_json.get("not_rooms", []))
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room_ids -= disallowed_rooms
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allowed_rooms = self.filter_json.get("rooms", None)
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if allowed_rooms is not None:
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room_ids &= set(allowed_rooms)
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return room_ids
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def filter(self, events):
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return filter(self.check, events)
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def limit(self):
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return self.filter_json.get("limit", 10)
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def _matches_wildcard(actual_value, filter_value):
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if filter_value.endswith("*"):
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type_prefix = filter_value[:-1]
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return actual_value.startswith(type_prefix)
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else:
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return actual_value == filter_value
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DEFAULT_FILTER_COLLECTION = FilterCollection({})
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