feat: support MSC 3935: cute events

- add cute event skeletron (`im.fluffychat.cute_events`)
- add cute events to default command batch
- this way, all SDK users can profit from cute events
- supported events: `hug`, `googly_eyes`, `cuddle`

Fixes:
https://rail.chat/@AgathaSorceress@eldritch.cafe/109336005433123570

Signed-off-by: TheOneWithTheBraid <the-one@with-the-braid.cf>

lib/encryption/encryption.dart

@@ -354,7 +354,8 @@ class Encryption {
   Future<Map<String, dynamic>> encryptGroupMessagePayload(
       String roomId, Map<String, dynamic> payload,
       {String type = EventTypes.Message}) async {
-    final Map<String, dynamic>? mRelatesTo = payload.remove('m.relates_to');
+    final Map<String, dynamic>? mRelatesTo =
+        Map.from(payload).remove('m.relates_to');
     // Events which only contain a m.relates_to like reactions don't need to
     // be encrypted.
     if (payload.isEmpty && mRelatesTo != null) {

lib/encryption/utils/bootstrap.dart

@@ -27,7 +27,6 @@ import 'package:matrix/encryption/key_manager.dart';
 import 'package:matrix/encryption/ssss.dart';
 import 'package:matrix/encryption/utils/base64_unpadded.dart';
 import 'package:matrix/matrix.dart';
-import 'package:matrix/msc_extensions/msc_3814_dehydrated_devices/msc_3814_dehydrated_devices.dart';
 
 enum BootstrapState {
   /// Is loading.

lib/matrix.dart

@@ -56,7 +56,10 @@ export 'src/utils/uia_request.dart';
 export 'src/utils/uri_extension.dart';
 
 export 'msc_extensions/extension_recent_emoji/recent_emoji.dart';
+export 'msc_extensions/msc_3935_cute_events/msc_3935_cute_events.dart';
 export 'msc_extensions/msc_1236_widgets/msc_1236_widgets.dart';
+export 'msc_extensions/msc_2835_uia_login/msc_2835_uia_login.dart';
+export 'msc_extensions/msc_3814_dehydrated_devices/msc_3814_dehydrated_devices.dart';
 
 export 'src/utils/web_worker/web_worker_stub.dart'
     if (dart.library.html) 'src/utils/web_worker/web_worker.dart';

lib/msc_extensions/README.md

@@ -18,4 +18,7 @@ Please try to cover the following conventions:
 ## Implemented non-spec features
 
 - MSC 1236 - Widget API V2
+- MSC 2835 - UIA login
+- MSC 3814 - Dehydrated Devices
+- MSC 3935 - Cute Events
 - `io.element.recent_emoji` - recent emoji sync in account data

lib/msc_extensions/msc_3935_cute_events/msc_3935_cute_events.dart

@@ -0,0 +1,21 @@
+abstract class CuteEventContent {
+  static const String eventType = 'im.fluffychat.cute_event';
+
+  const CuteEventContent._();
+
+  static Map<String, dynamic> get googlyEyes => {
+        'msgtype': CuteEventContent.eventType,
+        'cute_type': 'googly_eyes',
+        'body': '👀'
+      };
+  static Map<String, dynamic> get cuddle => {
+        'msgtype': CuteEventContent.eventType,
+        'cute_type': 'cuddle',
+        'body': '😊'
+      };
+  static Map<String, dynamic> get hug => {
+        'msgtype': CuteEventContent.eventType,
+        'cute_type': 'hug',
+        'body': '🤗',
+      };
+}

lib/src/utils/commands_extension.dart

@@ -227,6 +227,33 @@ extension CommandsClientExtension on Client {
       await args.room.removeFromDirectChat();
       return;
     });
+    addCommand('hug', (CommandArgs args) async {
+      final content = CuteEventContent.hug;
+      return await args.room.sendEvent(
+        content,
+        inReplyTo: args.inReplyTo,
+        editEventId: args.editEventId,
+        txid: args.txid,
+      );
+    });
+    addCommand('googly', (CommandArgs args) async {
+      final content = CuteEventContent.googlyEyes;
+      return await args.room.sendEvent(
+        content,
+        inReplyTo: args.inReplyTo,
+        editEventId: args.editEventId,
+        txid: args.txid,
+      );
+    });
+    addCommand('cuddle', (CommandArgs args) async {
+      final content = CuteEventContent.cuddle;
+      return await args.room.sendEvent(
+        content,
+        inReplyTo: args.inReplyTo,
+        editEventId: args.editEventId,
+        txid: args.txid,
+      );
+    });
   }
 }
 
@@ -236,6 +263,7 @@ class CommandArgs {
   Event? inReplyTo;
   Room room;
   String? txid;
+
   CommandArgs(
       {required this.msg,
       this.editEventId,

test/commands_test.dart

@@ -378,6 +378,27 @@ void main() {
       expect(room.client.prevBatch, null);
     });
 
+    test('cute events - googly eyes', () async {
+      FakeMatrixApi.calledEndpoints.clear();
+      await room.sendTextEvent('/googly');
+      final sent = getLastMessagePayload();
+      expect(sent, CuteEventContent.googlyEyes);
+    });
+
+    test('cute events - hug', () async {
+      FakeMatrixApi.calledEndpoints.clear();
+      await room.sendTextEvent('/hug');
+      final sent = getLastMessagePayload();
+      expect(sent, CuteEventContent.hug);
+    });
+
+    test('cute events - hug', () async {
+      FakeMatrixApi.calledEndpoints.clear();
+      await room.sendTextEvent('/cuddle');
+      final sent = getLastMessagePayload();
+      expect(sent, CuteEventContent.cuddle);
+    });
+
     test('dispose client', () async {
       await client.dispose(closeDatabase: true);
     });