Update badge counts in new room list as needed

src/utils/read-receipts.ts

@@ -0,0 +1,34 @@
+/*
+Copyright 2020 The Matrix.org Foundation C.I.C.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+import { MatrixEvent } from "matrix-js-sdk/src/models/event";
+import { MatrixClient } from "matrix-js-sdk/src/client";
+
+/**
+ * Determines if a read receipt update event includes the client's own user.
+ * @param event The event to check.
+ * @param client The client to check against.
+ * @returns True if the read receipt update includes the client, false otherwise.
+ */
+export function readReceiptChangeIsFor(event: MatrixEvent, client: MatrixClient): boolean {
+    const myUserId = client.getUserId();
+    for (const eventId of Object.keys(event.getContent())) {
+        const receiptUsers = Object.keys(event.getContent()[eventId]['m.read'] || {});
+        if (receiptUsers.includes(myUserId)) {
+            return true;
+        }
+    }
+}