Avatar defaults and colors

ts/util/getAvatarData.ts

@@ -0,0 +1,20 @@
+// Copyright 2021 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
+import { AvatarDataType, getDefaultAvatars } from '../types/Avatar';
+import { isDirectConversation } from './whatTypeOfConversation';
+import { ConversationAttributesType } from '../model-types.d';
+
+export function getAvatarData(
+  conversationAttrs: Pick<ConversationAttributesType, 'avatars' | 'type'>
+): Array<AvatarDataType> {
+  const { avatars } = conversationAttrs;
+
+  if (avatars && avatars.length) {
+    return avatars;
+  }
+
+  const isGroup = !isDirectConversation(conversationAttrs);
+
+  return getDefaultAvatars(isGroup);
+}