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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.
import logging
from six import iteritems, string_types
from twisted.internet import defer
from synapse.api.errors import SynapseError
from synapse.api.urls import ConsentURIBuilder
from synapse.config import ConfigError
from synapse.types import get_localpart_from_id
from synapse.api.constants import EventTypes
logger = logging.getLogger(__name__)
class ConsentServerNotices(object):
"""Keeps track of whether we need to send users server_notices about
privacy policy consent, and sends one if we do.
"""
def __init__(self, hs):
"""
Args:
hs (synapse.server.HomeServer):
"""
self._server_notices_manager = hs.get_server_notices_manager()
self._store = hs.get_datastore()
self._users_in_progress = set()
self._current_consent_version = hs.config.user_consent_version
self._server_notice_content = hs.config.user_consent_server_notice_content
self._send_to_guests = hs.config.user_consent_server_notice_to_guests
if self._server_notice_content is not None:
if not self._server_notices_manager.is_enabled():
raise ConfigError(
"user_consent configuration requires server notices, but "
"server notices are not enabled.",
)
if 'body' not in self._server_notice_content:
raise ConfigError(
"user_consent server_notice_consent must contain a 'body' "
"key.",
)
self._consent_uri_builder = ConsentURIBuilder(hs.config)
@defer.inlineCallbacks
def maybe_send_server_notice_to_user(self, user_id):
"""Check if we need to send a notice to this user, and does so if so
Args:
user_id (str): user to check
Returns:
Deferred
"""
if self._server_notice_content is None:
# not enabled
return
# make sure we don't send two messages to the same user at once
if user_id in self._users_in_progress:
return
self._users_in_progress.add(user_id)
try:
u = yield self._store.get_user_by_id(user_id)
if u["is_guest"] and not self._send_to_guests:
# don't send to guests
return
if u["consent_version"] == self._current_consent_version:
# user has already consented
return
if u["consent_server_notice_sent"] == self._current_consent_version:
# we've already sent a notice to the user
return
# need to send a message.
try:
consent_uri = self._consent_uri_builder.build_user_consent_uri(
get_localpart_from_id(user_id),
)
content = copy_with_str_subst(
self._server_notice_content, {
'consent_uri': consent_uri,
},
)
yield self._server_notices_manager.send_notice(
user_id, content, EventTypes.Message
)
yield self._store.user_set_consent_server_notice_sent(
user_id, self._current_consent_version,
)
except SynapseError as e:
logger.error("Error sending server notice about user consent: %s", e)
finally:
self._users_in_progress.remove(user_id)
def copy_with_str_subst(x, substitutions):
"""Deep-copy a structure, carrying out string substitions on any strings
Args:
x (object): structure to be copied
substitutions (object): substitutions to be made - passed into the
string '%' operator
Returns:
copy of x
"""
if isinstance(x, string_types):
return x % substitutions
if isinstance(x, dict):
return {
k: copy_with_str_subst(v, substitutions) for (k, v) in iteritems(x)
}
if isinstance(x, (list, tuple)):
return [copy_with_str_subst(y) for y in x]
# assume it's uninterested and can be shallow-copied.
return x
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