Add ❌ support

bin/nexusbot.dart

@@ -45,15 +45,14 @@ void main(List<String> argsRaw) async {
       if (event.senderId.startsWith("@${settings.name}:")) return;
       switch (event.type) {
         case EventTypes.Reaction:
-          if ((event.content["m.relates_to"] as Map<String, dynamic>)["key"] !=
-              "✅") {
-            return;
-          }
+          final reaction =
+              (event.content["m.relates_to"] as Map<String, dynamic>)["key"];
           final parentEvent = await client.getOneRoomEvent(
             event.roomId!,
             event.relationshipEventId!,
           );
           if (!parentEvent.senderId.startsWith("@${settings.name}:")) return;
+          if (reaction == "✅") {
             final registration = Registration.fromJson(parentEvent.content);
             container
                 .read(RegistrationController.provider.notifier)
@@ -62,6 +61,12 @@ void main(List<String> argsRaw) async {
             await event.room.sendTextEvent(
               "!admin users create ${registration.username}",
             );
+          } else if (reaction != "❌") {
+            await Event.fromMatrixEvent(
+              parentEvent,
+              event.room,
+            ).redactEvent(reason: "${event.senderId} reacted with ❌");
+          }
           break;
         case EventTypes.Message:
           if (!event.senderId.startsWith("@${settings.adminName}:")) break;
@@ -158,6 +163,7 @@ If you have any issues, reply to this email.""",
                 });
 
                 await room.sendReaction(event!, "✅");
+                await room.sendReaction(event, "❌");
 
                 return Response.found(settings.successUri);
               } catch (error, stackTrace) {