230 lines
8.6 KiB
Python
230 lines
8.6 KiB
Python
# -*- coding: utf-8 -*-
|
|
# Copyright 2015 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 synapse.api.errors import SynapseError
|
|
from synapse.types import UserID, RoomID
|
|
|
|
|
|
class Filtering(object):
|
|
|
|
def __init__(self, hs):
|
|
super(Filtering, self).__init__()
|
|
self.store = hs.get_datastore()
|
|
|
|
def get_user_filter(self, user_localpart, filter_id):
|
|
result = self.store.get_user_filter(user_localpart, filter_id)
|
|
result.addCallback(Filter)
|
|
return 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.
|
|
|
|
top_level_definitions = [
|
|
"public_user_data", "private_user_data", "server_data"
|
|
]
|
|
|
|
room_level_definitions = [
|
|
"state", "events", "ephemeral"
|
|
]
|
|
|
|
for key in top_level_definitions:
|
|
if key in user_filter_json:
|
|
self._check_definition(user_filter_json[key])
|
|
|
|
if "room" in user_filter_json:
|
|
for key in room_level_definitions:
|
|
if key in user_filter_json["room"]:
|
|
self._check_definition(user_filter_json["room"][key])
|
|
|
|
def _check_definition(self, definition):
|
|
"""Check if the provided definition is valid.
|
|
|
|
This inspects not only the types but also the values to make sure they
|
|
make sense.
|
|
|
|
Args:
|
|
definition(dict): The filter definition
|
|
Raises:
|
|
SynapseError: If there was a problem with this definition.
|
|
"""
|
|
# 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.
|
|
if type(definition) != dict:
|
|
raise SynapseError(
|
|
400, "Expected JSON object, not %s" % (definition,)
|
|
)
|
|
|
|
# check rooms are valid room IDs
|
|
room_id_keys = ["rooms", "not_rooms"]
|
|
for key in room_id_keys:
|
|
if key in definition:
|
|
if type(definition[key]) != list:
|
|
raise SynapseError(400, "Expected %s to be a list." % key)
|
|
for room_id in definition[key]:
|
|
RoomID.from_string(room_id)
|
|
|
|
# check senders are valid user IDs
|
|
user_id_keys = ["senders", "not_senders"]
|
|
for key in user_id_keys:
|
|
if key in definition:
|
|
if type(definition[key]) != list:
|
|
raise SynapseError(400, "Expected %s to be a list." % key)
|
|
for user_id in definition[key]:
|
|
UserID.from_string(user_id)
|
|
|
|
# TODO: We don't limit event type values but we probably should...
|
|
# check types are valid event types
|
|
event_keys = ["types", "not_types"]
|
|
for key in event_keys:
|
|
if key in definition:
|
|
if type(definition[key]) != list:
|
|
raise SynapseError(400, "Expected %s to be a list." % key)
|
|
for event_type in definition[key]:
|
|
if not isinstance(event_type, basestring):
|
|
raise SynapseError(400, "Event type should be a string")
|
|
|
|
if "format" in definition:
|
|
event_format = definition["format"]
|
|
if event_format not in ["federation", "events"]:
|
|
raise SynapseError(400, "Invalid format: %s" % (event_format,))
|
|
|
|
if "select" in definition:
|
|
event_select_list = definition["select"]
|
|
for select_key in event_select_list:
|
|
if select_key not in ["event_id", "origin_server_ts",
|
|
"thread_id", "content", "content.body"]:
|
|
raise SynapseError(400, "Bad select: %s" % (select_key,))
|
|
|
|
if ("bundle_updates" in definition and
|
|
type(definition["bundle_updates"]) != bool):
|
|
raise SynapseError(400, "Bad bundle_updates: expected bool.")
|
|
|
|
|
|
class Filter(object):
|
|
def __init__(self, filter_json):
|
|
self.filter_json = filter_json
|
|
|
|
def filter_public_user_data(self, events):
|
|
return self._filter_on_key(events, ["public_user_data"])
|
|
|
|
def filter_private_user_data(self, events):
|
|
return self._filter_on_key(events, ["private_user_data"])
|
|
|
|
def filter_room_state(self, events):
|
|
return self._filter_on_key(events, ["room", "state"])
|
|
|
|
def filter_room_events(self, events):
|
|
return self._filter_on_key(events, ["room", "events"])
|
|
|
|
def filter_room_ephemeral(self, events):
|
|
return self._filter_on_key(events, ["room", "ephemeral"])
|
|
|
|
def _filter_on_key(self, events, keys):
|
|
filter_json = self.filter_json
|
|
if not filter_json:
|
|
return events
|
|
|
|
try:
|
|
# extract the right definition from the filter
|
|
definition = filter_json
|
|
for key in keys:
|
|
definition = definition[key]
|
|
return self._filter_with_definition(events, definition)
|
|
except KeyError:
|
|
# return all events if definition isn't specified.
|
|
return events
|
|
|
|
def _filter_with_definition(self, events, definition):
|
|
return [e for e in events if self._passes_definition(definition, e)]
|
|
|
|
def _passes_definition(self, definition, event):
|
|
"""Check if the event passes through the given definition.
|
|
|
|
Args:
|
|
definition(dict): The definition to check against.
|
|
event(Event): The event to check.
|
|
Returns:
|
|
True if the event passes through the filter.
|
|
"""
|
|
# Algorithm notes:
|
|
# For each key in the definition, check the event meets the criteria:
|
|
# * For types: Literal match or prefix match (if ends with wildcard)
|
|
# * For senders/rooms: Literal match only
|
|
# * "not_" checks take presedence (e.g. if "m.*" is in both 'types'
|
|
# and 'not_types' then it is treated as only being in 'not_types')
|
|
|
|
# room checks
|
|
if hasattr(event, "room_id"):
|
|
room_id = event.room_id
|
|
allow_rooms = definition.get("rooms", None)
|
|
reject_rooms = definition.get("not_rooms", None)
|
|
if reject_rooms and room_id in reject_rooms:
|
|
return False
|
|
if allow_rooms and room_id not in allow_rooms:
|
|
return False
|
|
|
|
# sender checks
|
|
if hasattr(event, "sender"):
|
|
# Should we be including event.state_key for some event types?
|
|
sender = event.sender
|
|
allow_senders = definition.get("senders", None)
|
|
reject_senders = definition.get("not_senders", None)
|
|
if reject_senders and sender in reject_senders:
|
|
return False
|
|
if allow_senders and sender not in allow_senders:
|
|
return False
|
|
|
|
# type checks
|
|
if "not_types" in definition:
|
|
for def_type in definition["not_types"]:
|
|
if self._event_matches_type(event, def_type):
|
|
return False
|
|
if "types" in definition:
|
|
included = False
|
|
for def_type in definition["types"]:
|
|
if self._event_matches_type(event, def_type):
|
|
included = True
|
|
break
|
|
if not included:
|
|
return False
|
|
|
|
return True
|
|
|
|
def _event_matches_type(self, event, def_type):
|
|
if def_type.endswith("*"):
|
|
type_prefix = def_type[:-1]
|
|
return event.type.startswith(type_prefix)
|
|
else:
|
|
return event.type == def_type
|