snapshot of https://github.com/RocketChat/Rocket.Chat.git (develop, 2026-09-16; blobs > 131072B omitted)

apps/meteor/server/lib/messaging/discussions/updateAndNotifyParentRoomWithParentMessage.ts

@@ -0,0 +1,55 @@
+import type { IRoom, MessageTypesValues } from '@rocket.chat/core-typings';
+import { Messages } from '@rocket.chat/models';
+
+import { settings } from '../../../settings/cached';
+import { notifyOnMessageChange } from '../../notifyListener';
+
+type DiscussionRoom = Pick<IRoom, '_id' | 'msgs' | 'lm' | 'sysMes'>;
+
+/**
+ * Both the system messages hidden globally and the ones hidden on the room itself are
+ * filtered out from the room history, so the count has to consider both of them.
+ * Type `rm` is filtered out because it's already discounted when the message is deleted.
+ */
+const getHiddenTypesToDiscount = (room: DiscussionRoom): MessageTypesValues[] => {
+	const globalHiddenTypes = settings.get<MessageTypesValues[]>('Hide_System_Messages');
+	const globallyHiddenTypes = Array.isArray(globalHiddenTypes) ? globalHiddenTypes : [];
+	const roomHiddenTypes = Array.isArray(room.sysMes) ? room.sysMes : [];
+
+	return [...new Set([...globallyHiddenTypes, ...roomHiddenTypes])]
+		.flatMap<MessageTypesValues>((type) =>
+			// `mute_unmute` is a single option covering two different message types
+			type === 'mute_unmute' ? ['user-muted', 'user-unmuted'] : [type],
+		)
+		.filter((type) => type !== 'rm');
+};
+
+const getDiscussionMessagesCount = async (room: DiscussionRoom): Promise<number> => {
+	const hiddenMessageTypes = getHiddenTypesToDiscount(room);
+
+	if (!hiddenMessageTypes.length) {
+		return room.msgs;
+	}
+
+	const hiddenMessagesCount = await Messages.countVisibleByRoomIdContainingTypes(room._id, hiddenMessageTypes);
+
+	return Math.max(room.msgs - hiddenMessagesCount, 0);
+};
+
+/**
+ * Copies the current metadata of a discussion (messages count and last message timestamp) to the
+ *  message which links to it on the parent room, and notifies the change to the clients.
+ */
+export const updateAndNotifyParentRoomWithParentMessage = async (room: DiscussionRoom): Promise<void> => {
+	room.msgs = await getDiscussionMessagesCount(room);
+
+	const parentMessage = await Messages.refreshDiscussionMetadata(room);
+	if (!parentMessage) {
+		return;
+	}
+
+	void notifyOnMessageChange({
+		id: parentMessage._id,
+		data: parentMessage,
+	});
+};