add room directory support

lib/models/content/bot_command_description.dart

@@ -2,6 +2,7 @@ import "package:collection/collection.dart";
 import "package:fast_immutable_collections/fast_immutable_collections.dart";
 import "package:freezed_annotation/freezed_annotation.dart";
 import "package:nexus/helpers/extensions/get_link_info.dart";
+import "package:nexus/helpers/extensions/get_localpart.dart";
 import "package:nexus/models/content/content.dart";
 
 part "bot_command_description.freezed.dart";
@@ -181,10 +182,6 @@ enum BotPrimitiveType(final String label, final String expected) {
   @JsonValue("event_id")
   eventId("event", r"a message link or event ID like $abc");
 
-  static final serverNamePattern = RegExp(
-    r"^(\[[0-9A-Fa-f:.]+\]|[A-Za-z0-9.-]+)(:\d{1,5})?$",
-  );
-
   Object? parse(String text, {required String roomId}) {
     final (:identifier, :eventId, :via) =
         text.linkInfo ??
@@ -206,7 +203,7 @@ enum BotPrimitiveType(final String label, final String expected) {
         identifier,
       .roomAlias when identifier.startsWith("#") && identifier.contains(":") =>
         identifier,
-      .serverName when serverNamePattern.hasMatch(text) => text,
+      .serverName when text.isValidServerName => text,
       .roomId when identifier.startsWith("!") && eventId == null => {
         "type": "room_id",
         "id": identifier,

lib/models/requests/get_room_directory.dart

@@ -0,0 +1,28 @@
+import "package:freezed_annotation/freezed_annotation.dart";
+
+part "get_room_directory.freezed.dart";
+part "get_room_directory.g.dart";
+
+@Freezed(toJson: false, fromJson: false)
+@JsonSerializable(includeIfNull: false, explicitToJson: true)
+class const GetRoomDirectoryRequest({
+  final String? server,
+  final int limit = 48,
+  final String? since,
+  final PublicRoomsFilter? filter,
+}) with _$GetRoomDirectoryRequest {
+  Map<String, Object?> toJson() => _$GetRoomDirectoryRequestToJson(this);
+
+  factory GetRoomDirectoryRequest.fromJson(Map<String, Object?> json) =>
+      _$GetRoomDirectoryRequestFromJson(json);
+}
+
+@Freezed(toJson: false, fromJson: false)
+@JsonSerializable(includeIfNull: false)
+class const PublicRoomsFilter({final String? genericSearchTerm})
+    with _$PublicRoomsFilter {
+  Map<String, Object?> toJson() => _$PublicRoomsFilterToJson(this);
+
+  factory PublicRoomsFilter.fromJson(Map<String, Object?> json) =>
+      _$PublicRoomsFilterFromJson(json);
+}

lib/models/room_directory.dart

@@ -0,0 +1,17 @@
+import "package:fast_immutable_collections/fast_immutable_collections.dart";
+import "package:freezed_annotation/freezed_annotation.dart";
+import "package:nexus/models/room_summary.dart";
+
+part "room_directory.freezed.dart";
+part "room_directory.g.dart";
+
+@Freezed(toJson: false, fromJson: false)
+@JsonSerializable(createToJson: false)
+class const RoomDirectory({
+  @JsonKey(name: "chunk") final IList<RoomSummary> rooms = const .empty(),
+  final String? nextBatch,
+  final int? totalRoomCountEstimate,
+}) with _$RoomDirectory {
+  factory RoomDirectory.fromJson(Map<String, Object?> json) =>
+      _$RoomDirectoryFromJson(json);
+}

lib/models/settings.dart

@@ -1,3 +1,4 @@
+import "package:fast_immutable_collections/fast_immutable_collections.dart";
 import "package:material_ui/material_ui.dart";
 import "package:freezed_annotation/freezed_annotation.dart";
 import "package:nexus/models/name_color.dart";
@@ -25,6 +26,10 @@ class const Settings({
   /// When not sending, read receipts are still sent privately, so that the
   /// user's other devices know what has been read.
   final ShowAndSend readReceipts = .showAndSend,
+  final IList<String> directoryServers = const IListConst([
+    "matrix.org",
+    "matrixrooms.info",
+  ]),
 }) with _$Settings {
   Map<String, Object?> toJson() => _$SettingsToJson(this);