add default_power_level_content_override config option. (#12618)

Co-authored-by: Matthew Hodgson <matthew@matrix.org>

1 files changed, 47 insertions, 0 deletions

diff --git a/synapse/config/room.py b/synapse/config/room.py

index e18a87ea37..462d85ac1d 100644
--- a/synapse/config/room.py
+++ b/synapse/config/room.py
@@ -63,6 +63,19 @@ class RoomConfig(Config):
                 "Invalid value for encryption_enabled_by_default_for_room_type"
             )
 
+        self.default_power_level_content_override = config.get(
+            "default_power_level_content_override",
+            None,
+        )
+        if self.default_power_level_content_override is not None:
+            for preset in self.default_power_level_content_override:
+                if preset not in vars(RoomCreationPreset).values():
+                    raise ConfigError(
+                        "Unrecognised room preset %s in default_power_level_content_override"
+                        % preset
+                    )
+                # We validate the actual overrides when we try to apply them.
+
     def generate_config_section(self, **kwargs: Any) -> str:
         return """\
         ## Rooms ##
@@ -83,4 +96,38 @@ class RoomConfig(Config):
         # will also not affect rooms created by other servers.
         #
         #encryption_enabled_by_default_for_room_type: invite
+
+        # Override the default power levels for rooms created on this server, per
+        # room creation preset.
+        #
+        # The appropriate dictionary for the room preset will be applied on top
+        # of the existing power levels content.
+        #
+        # Useful if you know that your users need special permissions in rooms
+        # that they create (e.g. to send particular types of state events without
+        # needing an elevated power level).  This takes the same shape as the
+        # `power_level_content_override` parameter in the /createRoom API, but
+        # is applied before that parameter.
+        #
+        # Valid keys are some or all of `private_chat`, `trusted_private_chat`
+        # and `public_chat`. Inside each of those should be any of the
+        # properties allowed in `power_level_content_override` in the
+        # /createRoom API. If any property is missing, its default value will
+        # continue to be used. If any property is present, it will overwrite
+        # the existing default completely (so if the `events` property exists,
+        # the default event power levels will be ignored).
+        #
+        #default_power_level_content_override:
+        #    private_chat:
+        #        "events":
+        #            "com.example.myeventtype" : 0
+        #            "m.room.avatar": 50
+        #            "m.room.canonical_alias": 50
+        #            "m.room.encryption": 100
+        #            "m.room.history_visibility": 100
+        #            "m.room.name": 50
+        #            "m.room.power_levels": 100
+        #            "m.room.server_acl": 100
+        #            "m.room.tombstone": 100
+        #        "events_default": 1
         """