Moves conversation.getProps out of models

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

ts/util/canChangeTimer.ts

@@ -0,0 +1,39 @@
+// 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 { areWeAdmin } from './areWeAdmin';
+import {
+  isDirectConversation,
+  isGroupV1,
+  isGroupV2,
+} from './whatTypeOfConversation';
+
+export function canChangeTimer(
+  attributes: ConversationAttributesType
+): boolean {
+  if (isDirectConversation(attributes)) {
+    return true;
+  }
+
+  if (isGroupV1(attributes)) {
+    return false;
+  }
+
+  if (!isGroupV2(attributes)) {
+    return true;
+  }
+
+  const accessControlEnum = Proto.AccessControl.AccessRequired;
+  const { accessControl } = attributes;
+  const canAnyoneChangeTimer =
+    accessControl &&
+    (accessControl.attributes === accessControlEnum.ANY ||
+      accessControl.attributes === accessControlEnum.MEMBER);
+  if (canAnyoneChangeTimer) {
+    return true;
+  }
+
+  return areWeAdmin(attributes);
+}