diff --git a/synapse/config/room.py b/synapse/config/room.py
new file mode 100644
index 0000000000..6aa4de0672
--- /dev/null
+++ b/synapse/config/room.py
@@ -0,0 +1,80 @@
+# -*- coding: utf-8 -*-
+# Copyright 2020 The Matrix.org Foundation C.I.C.
+#
+# 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 synapse.api.constants import RoomCreationPreset
+
+from ._base import Config, ConfigError
+
+logger = logging.Logger(__name__)
+
+
+class RoomDefaultEncryptionTypes(object):
+ """Possible values for the encryption_enabled_by_default_for_room_type config option"""
+
+ ALL = "all"
+ INVITE = "invite"
+ OFF = "off"
+
+
+class RoomConfig(Config):
+ section = "room"
+
+ def read_config(self, config, **kwargs):
+ # Whether new, locally-created rooms should have encryption enabled
+ encryption_for_room_type = config.get(
+ "encryption_enabled_by_default_for_room_type",
+ RoomDefaultEncryptionTypes.OFF,
+ )
+ if encryption_for_room_type == RoomDefaultEncryptionTypes.ALL:
+ self.encryption_enabled_by_default_for_room_presets = [
+ RoomCreationPreset.PRIVATE_CHAT,
+ RoomCreationPreset.TRUSTED_PRIVATE_CHAT,
+ RoomCreationPreset.PUBLIC_CHAT,
+ ]
+ elif encryption_for_room_type == RoomDefaultEncryptionTypes.INVITE:
+ self.encryption_enabled_by_default_for_room_presets = [
+ RoomCreationPreset.PRIVATE_CHAT,
+ RoomCreationPreset.TRUSTED_PRIVATE_CHAT,
+ ]
+ elif encryption_for_room_type == RoomDefaultEncryptionTypes.OFF:
+ self.encryption_enabled_by_default_for_room_presets = []
+ else:
+ raise ConfigError(
+ "Invalid value for encryption_enabled_by_default_for_room_type"
+ )
+
+ def generate_config_section(self, **kwargs):
+ return """\
+ ## Rooms ##
+
+ # Controls whether locally-created rooms should be end-to-end encrypted by
+ # default.
+ #
+ # Possible options are "all", "invite", and "off". They are defined as:
+ #
+ # * "all": any locally-created room
+ # * "invite": any room created with the "private_chat" or "trusted_private_chat"
+ # room creation presets
+ # * "off": this option will take no effect
+ #
+ # The default value is "off".
+ #
+ # Note that this option will only affect rooms created after it is set. It
+ # will also not affect rooms created by other servers.
+ #
+ #encryption_enabled_by_default_for_room_type: invite
+ """
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