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# -*- coding: utf-8 -*-
# Copyright 2017 New Vector Ltd
# Copyright 2019 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 inspect
from typing import Any, Dict, List, Optional, Tuple
from synapse.spam_checker_api import RegistrationBehaviour, SpamCheckerApi
from synapse.types import Collection
MYPY = False
if MYPY:
import synapse.server
class SpamChecker:
def __init__(self, hs: "synapse.server.HomeServer"):
self.spam_checkers = [] # type: List[Any]
for module, config in hs.config.spam_checkers:
# Older spam checkers don't accept the `api` argument, so we
# try and detect support.
spam_args = inspect.getfullargspec(module)
if "api" in spam_args.args:
api = SpamCheckerApi(hs)
self.spam_checkers.append(module(config=config, api=api))
else:
self.spam_checkers.append(module(config=config))
def check_event_for_spam(self, event: "synapse.events.EventBase") -> bool:
"""Checks if a given event is considered "spammy" by this server.
If the server considers an event spammy, then it will be rejected if
sent by a local user. If it is sent by a user on another server, then
users receive a blank event.
Args:
event: the event to be checked
Returns:
True if the event is spammy.
"""
for spam_checker in self.spam_checkers:
if spam_checker.check_event_for_spam(event):
return True
return False
def user_may_invite(
self, inviter_userid: str, invitee_userid: str, room_id: str
) -> bool:
"""Checks if a given user may send an invite
If this method returns false, the invite will be rejected.
Args:
inviter_userid: The user ID of the sender of the invitation
invitee_userid: The user ID targeted in the invitation
room_id: The room ID
Returns:
True if the user may send an invite, otherwise False
"""
for spam_checker in self.spam_checkers:
if (
spam_checker.user_may_invite(inviter_userid, invitee_userid, room_id)
is False
):
return False
return True
def user_may_create_room(self, userid: str) -> bool:
"""Checks if a given user may create a room
If this method returns false, the creation request will be rejected.
Args:
userid: The ID of the user attempting to create a room
Returns:
True if the user may create a room, otherwise False
"""
for spam_checker in self.spam_checkers:
if spam_checker.user_may_create_room(userid) is False:
return False
return True
def user_may_create_room_alias(self, userid: str, room_alias: str) -> bool:
"""Checks if a given user may create a room alias
If this method returns false, the association request will be rejected.
Args:
userid: The ID of the user attempting to create a room alias
room_alias: The alias to be created
Returns:
True if the user may create a room alias, otherwise False
"""
for spam_checker in self.spam_checkers:
if spam_checker.user_may_create_room_alias(userid, room_alias) is False:
return False
return True
def user_may_publish_room(self, userid: str, room_id: str) -> bool:
"""Checks if a given user may publish a room to the directory
If this method returns false, the publish request will be rejected.
Args:
userid: The user ID attempting to publish the room
room_id: The ID of the room that would be published
Returns:
True if the user may publish the room, otherwise False
"""
for spam_checker in self.spam_checkers:
if spam_checker.user_may_publish_room(userid, room_id) is False:
return False
return True
def check_username_for_spam(self, user_profile: Dict[str, str]) -> bool:
"""Checks if a user ID or display name are considered "spammy" by this server.
If the server considers a username spammy, then it will not be included in
user directory results.
Args:
user_profile: The user information to check, it contains the keys:
* user_id
* display_name
* avatar_url
Returns:
True if the user is spammy.
"""
for spam_checker in self.spam_checkers:
# For backwards compatibility, only run if the method exists on the
# spam checker
checker = getattr(spam_checker, "check_username_for_spam", None)
if checker:
# Make a copy of the user profile object to ensure the spam checker
# cannot modify it.
if checker(user_profile.copy()):
return True
return False
def check_registration_for_spam(
self,
email_threepid: Optional[dict],
username: Optional[str],
request_info: Collection[Tuple[str, str]],
) -> RegistrationBehaviour:
"""Checks if we should allow the given registration request.
Args:
email_threepid: The email threepid used for registering, if any
username: The request user name, if any
request_info: List of tuples of user agent and IP that
were used during the registration process.
Returns:
Enum for how the request should be handled
"""
for spam_checker in self.spam_checkers:
# For backwards compatibility, only run if the method exists on the
# spam checker
checker = getattr(spam_checker, "check_registration_for_spam", None)
if checker:
behaviour = checker(email_threepid, username, request_info)
assert isinstance(behaviour, RegistrationBehaviour)
if behaviour != RegistrationBehaviour.ALLOW:
return behaviour
return RegistrationBehaviour.ALLOW
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