162 lines
5.3 KiB
Python
162 lines
5.3 KiB
Python
# Copyright 2018 New Vector Ltd
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# Copyright 2021 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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from typing import Any, List
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from matrix_common.regex import glob_to_regex
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from synapse.types import JsonDict
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from ._base import Config, ConfigError
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class RoomDirectoryConfig(Config):
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section = "roomdirectory"
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def read_config(self, config: JsonDict, **kwargs: Any) -> None:
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self.enable_room_list_search = config.get("enable_room_list_search", True)
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alias_creation_rules = config.get("alias_creation_rules")
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if alias_creation_rules is not None:
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self._alias_creation_rules = [
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_RoomDirectoryRule("alias_creation_rules", rule)
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for rule in alias_creation_rules
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]
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else:
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self._alias_creation_rules = [
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_RoomDirectoryRule("alias_creation_rules", {"action": "allow"})
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]
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room_list_publication_rules = config.get("room_list_publication_rules")
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if room_list_publication_rules is not None:
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self._room_list_publication_rules = [
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_RoomDirectoryRule("room_list_publication_rules", rule)
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for rule in room_list_publication_rules
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]
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else:
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self._room_list_publication_rules = [
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_RoomDirectoryRule("room_list_publication_rules", {"action": "allow"})
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]
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def is_alias_creation_allowed(self, user_id: str, room_id: str, alias: str) -> bool:
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"""Checks if the given user is allowed to create the given alias
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Args:
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user_id: The user to check.
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room_id: The room ID for the alias.
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alias: The alias being created.
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Returns:
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True if user is allowed to create the alias
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"""
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for rule in self._alias_creation_rules:
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if rule.matches(user_id, room_id, [alias]):
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return rule.action == "allow"
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return False
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def is_publishing_room_allowed(
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self, user_id: str, room_id: str, aliases: List[str]
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) -> bool:
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"""Checks if the given user is allowed to publish the room
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Args:
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user_id: The user ID publishing the room.
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room_id: The room being published.
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aliases: any local aliases associated with the room
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Returns:
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True if user can publish room
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"""
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for rule in self._room_list_publication_rules:
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if rule.matches(user_id, room_id, aliases):
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return rule.action == "allow"
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return False
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class _RoomDirectoryRule:
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"""Helper class to test whether a room directory action is allowed, like
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creating an alias or publishing a room.
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"""
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def __init__(self, option_name: str, rule: JsonDict):
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"""
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Args:
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option_name: Name of the config option this rule belongs to
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rule: The rule as specified in the config
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"""
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action = rule["action"]
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user_id = rule.get("user_id", "*")
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room_id = rule.get("room_id", "*")
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alias = rule.get("alias", "*")
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if action in ("allow", "deny"):
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self.action = action
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else:
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raise ConfigError(
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"%s rules can only have action of 'allow' or 'deny'" % (option_name,)
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)
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self._alias_matches_all = alias == "*"
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try:
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self._user_id_regex = glob_to_regex(user_id)
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self._alias_regex = glob_to_regex(alias)
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self._room_id_regex = glob_to_regex(room_id)
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except Exception as e:
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raise ConfigError("Failed to parse glob into regex") from e
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def matches(self, user_id: str, room_id: str, aliases: List[str]) -> bool:
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"""Tests if this rule matches the given user_id, room_id and aliases.
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Args:
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user_id: The user ID to check.
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room_id: The room ID to check.
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aliases: The associated aliases to the room. Will be a single element
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for testing alias creation, and can be empty for testing room
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publishing.
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Returns:
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True if the rule matches.
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"""
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# Note: The regexes are anchored at both ends
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if not self._user_id_regex.match(user_id):
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return False
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if not self._room_id_regex.match(room_id):
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return False
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# We only have alias checks left, so we can short circuit if the alias
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# rule matches everything.
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if self._alias_matches_all:
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return True
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# If we are not given any aliases then this rule only matches if the
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# alias glob matches all aliases, which we checked above.
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if not aliases:
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return False
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# Otherwise, we just need one alias to match
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for alias in aliases:
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if self._alias_regex.match(alias):
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return True
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return False
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