add support for publishing rooms to the room directory

Part of #134

lib/controllers/client.dart

@@ -482,6 +482,18 @@ class ClientController(final String? accountId) extends AsyncNotifier<int> {
   Future<void> deleteAlias(String alias) =>
       _sendCommand("delete_alias", {"alias": alias});
 
+  Future<bool> getRoomPublished(String roomId) async =>
+      (await _sendCommand("get_room_visibility", {
+        "room_id": roomId,
+      }))["visibility"] ==
+      "public";
+
+  Future<void> setRoomPublished(String roomId, bool published) =>
+      _sendCommand("publish_room", {
+        "room_id": roomId,
+        "visibility": published ? "public" : "private",
+      });
+
   /// The room [alias] points to, or null if it doesn't exist.
   Future<String?> resolveAlias(String alias) async {
     try {

lib/controllers/room_published.dart

@@ -0,0 +1,21 @@
+import "package:hooks_riverpod/hooks_riverpod.dart";
+import "package:nexus/controllers/client.dart";
+
+/// Whether a room is published to the user's server's room directory.
+class RoomPublishedController(final String roomId) extends AsyncNotifier<bool> {
+  @override
+  Future<bool> build() =>
+      ref.read(ClientController.provider.notifier).getRoomPublished(roomId);
+
+  Future<void> set(bool published) async {
+    await ref
+        .read(ClientController.provider.notifier)
+        .setRoomPublished(roomId, published);
+    ref.invalidateSelf();
+  }
+
+  static final provider = AsyncNotifierProvider.family
+      .autoDispose<RoomPublishedController, bool, String>(
+        RoomPublishedController.new,
+      );
+}

lib/controllers/room_settings_sections.dart

@@ -10,6 +10,7 @@ import "package:nexus/controllers/power_level.dart";
 import "package:nexus/controllers/power_levels_saving.dart";
 import "package:nexus/controllers/room_image_packs.dart";
 import "package:nexus/controllers/room_power_levels.dart";
+import "package:nexus/controllers/room_published.dart";
 import "package:nexus/controllers/rooms.dart";
 import "package:nexus/controllers/space_edges.dart";
 import "package:nexus/helpers/extensions/join_rule_name.dart";
@@ -555,6 +556,39 @@ class RoomSettingsSectionsController(final String roomId)
                     : null,
               ),
             ),
+            .new(
+              title: "Publish to Room Directory",
+              description: "List the room in your homeserver's directory.",
+              icon: Icons.travel_explore,
+              builder: (title, description, icon) => HookConsumer(
+                builder: (context, ref, _) {
+                  final saving = Saving.use();
+                  final published = ref.watch(
+                    RoomPublishedController.provider(roomId),
+                  );
+
+                  return SwitchListTile(
+                    secondary: Icon(icon),
+                    title: Text(title),
+                    subtitle: Text(description),
+                    value: published.value ?? false,
+                    onChanged:
+                        canSetAliases && published.hasValue && !saving.active
+                        ? (value) => saving.run(
+                            () => ref
+                                .read(
+                                  RoomPublishedController.provider(
+                                    roomId,
+                                  ).notifier,
+                                )
+                                .set(value)
+                                .onError(showError),
+                          )
+                        : null,
+                  );
+                },
+              ),
+            ),
           ]),
         ),
         .new(