Replace MessageController with MessageCache

ts/util/getMessageAuthorText.ts

@@ -0,0 +1,50 @@
+// Copyright 2023 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
+import type {
+  ConversationAttributesType,
+  MessageAttributesType,
+} from '../model-types.d';
+import { isIncoming, isOutgoing } from '../state/selectors/message';
+import { getTitle } from './getTitle';
+
+function getIncomingContact(
+  messageAttributes: MessageAttributesType
+): ConversationAttributesType | undefined {
+  if (!isIncoming(messageAttributes)) {
+    return undefined;
+  }
+  const { sourceServiceId } = messageAttributes;
+  if (!sourceServiceId) {
+    return undefined;
+  }
+
+  return window.ConversationController.getOrCreate(sourceServiceId, 'private')
+    .attributes;
+}
+
+export function getMessageAuthorText(
+  messageAttributes?: MessageAttributesType
+): string | undefined {
+  if (!messageAttributes) {
+    return undefined;
+  }
+
+  // if it's outgoing, it must be self-authored
+  const selfAuthor = isOutgoing(messageAttributes)
+    ? window.i18n('icu:you')
+    : undefined;
+
+  if (selfAuthor) {
+    return selfAuthor;
+  }
+
+  const incomingContact = getIncomingContact(messageAttributes);
+  if (incomingContact) {
+    return getTitle(incomingContact, { isShort: true });
+  }
+
+  // if it's not selfAuthor and there's no incoming contact,
+  // it might be a group notification, so we return undefined
+  return undefined;
+}