Moves conversation.getProps out of models

Co-authored-by: Scott Nonnenberg <scott@signal.org>

ts/util/areWeAdmin.ts

@@ -0,0 +1,27 @@
+// Copyright 2023 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
+import type { ConversationAttributesType } from '../model-types';
+import { SignalService as Proto } from '../protobuf';
+import { isGroupV2 } from './whatTypeOfConversation';
+
+export function areWeAdmin(
+  attributes: Pick<
+    ConversationAttributesType,
+    'groupId' | 'groupVersion' | 'membersV2'
+  >
+): boolean {
+  if (!isGroupV2(attributes)) {
+    return false;
+  }
+
+  const memberEnum = Proto.Member.Role;
+  const members = attributes.membersV2 || [];
+  const ourUuid = window.textsecure.storage.user.getUuid()?.toString();
+  const me = members.find(item => item.uuid === ourUuid);
+  if (!me) {
+    return false;
+  }
+
+  return me.role === memberEnum.ADMINISTRATOR;
+}