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