wip at implementing MSC 7075

synapse/server_notices/resource_limits_server_notices.py

@@ -0,0 +1,84 @@
+# -*- 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
+
+logger = logging.getLogger(__name__)
+
+
+class ResourceLimitsServerNotices(object):
+    """
+    """
+    def __init__(self, hs):
+        """
+
+        Args:
+            hs (synapse.server.HomeServer):
+        """
+        self._server_notices_manager = hs.get_server_notices_manager()
+        self._store = hs.get_datastore()
+        self._api = hs.get_api()
+        self._server_notice_content = hs.config.user_consent_server_notice_content
+        self._limit_usage_by_mau = config.limit_usage_by_mau = False
+        self._hs_disabled.config.hs_disabled = False
+
+        self._notified = set()
+        self._resouce_limited = False
+        # Config checks?
+
+    @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._limit_usage_by_mau is False and self._hs_disabled is False:
+            # not enabled
+            return
+
+        timestamp = yield self.store.user_last_seen_monthly_active(user_id)
+        if timestamp is None:
+            # This user will be blocked from receiving the notice anyway
+            return
+        try:
+            yield self.api.check_auth_blocking()
+            if self._resouce_limited:
+                # Need to start removing notices
+                pass
+        except AuthError as e:
+            # Need to start notifying of blocking
+            if not self._resouce_limited:
+                pass
+
+            # need to send a message.
+            try:
+                yield self._server_notices_manager.send_notice(
+                    user_id, content,
+                )
+
+            except SynapseError as e:
+                logger.error("Error sending server notice about resource limits: %s", e)