Convert KeyVerificationStateObserver to TS

Signed-off-by: Šimon Brandner <simon.bra.ag@gmail.com>

src/utils/KeyVerificationStateObserver.ts

@@ -0,0 +1,34 @@
+/*
+Copyright 2019 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 { MatrixClientPeg } from '../MatrixClientPeg';
+import { _t } from '../languageHandler';
+
+export function getNameForEventRoom(userId: string, roomId: string): string {
+    const client = MatrixClientPeg.get();
+    const room = client.getRoom(roomId);
+    const member = room && room.getMember(userId);
+    return member ? member.name : userId;
+}
+
+export function userLabelForEventRoom(userId: string, roomId: string): string {
+    const name = getNameForEventRoom(userId, roomId);
+    if (name !== userId) {
+        return _t("%(name)s (%(userId)s)", { name, userId });
+    } else {
+        return userId;
+    }
+}