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# -*- coding: utf-8 -*-
# Copyright 2018 New Vector 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.util import glob_to_regex
from ._base import Config, ConfigError
class RoomDirectoryConfig(Config):
def read_config(self, config):
alias_creation_rules = config["alias_creation_rules"]
self._alias_creation_rules = [
_AliasRule(rule)
for rule in alias_creation_rules
]
def default_config(self, config_dir_path, server_name, **kwargs):
return """
# The `alias_creation` option controls who's allowed to create aliases
# on this server.
#
# The format of this option is a list of rules that contain globs that
# match against user_id and the new alias (fully qualified with server
# name). The action in the first rule that matches is taken, which can
# currently either be "allow" or "deny".
#
# If no rules match the request is denied.
alias_creation_rules:
- user_id: "*"
alias: "*"
action: allow
"""
def is_alias_creation_allowed(self, user_id, alias):
"""Checks if the given user is allowed to create the given alias
Args:
user_id (str)
alias (str)
Returns:
boolean: True if user is allowed to crate the alias
"""
for rule in self._alias_creation_rules:
if rule.matches(user_id, alias):
return rule.action == "allow"
return False
class _AliasRule(object):
def __init__(self, rule):
action = rule["action"]
user_id = rule["user_id"]
alias = rule["alias"]
if action in ("allow", "deny"):
self.action = action
else:
raise ConfigError(
"alias_creation_rules rules can only have action of 'allow'"
" or 'deny'"
)
try:
self._user_id_regex = glob_to_regex(user_id)
self._alias_regex = glob_to_regex(alias)
except Exception as e:
raise ConfigError("Failed to parse glob into regex: %s", e)
def matches(self, user_id, alias):
"""Tests if this rule matches the given user_id and alias.
Args:
user_id (str)
alias (str)
Returns:
boolean
"""
# Note: The regexes are anchored at both ends
if not self._user_id_regex.match(user_id):
return False
if not self._alias_regex.match(alias):
return False
return True
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