Support phone number sharing flag on profile

ts/util/getE164.ts

@@ -0,0 +1,26 @@
+// Copyright 2023 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
+import type { ConversationAttributesType } from '../model-types.d';
+import type { ConversationType } from '../state/ducks/conversations';
+import { isInSystemContacts } from './isInSystemContacts';
+
+export function getE164(
+  attributes: Pick<
+    ConversationAttributesType | ConversationType,
+    | 'type'
+    | 'name'
+    | 'systemGivenName'
+    | 'systemFamilyName'
+    | 'e164'
+    | 'notSharingPhoneNumber'
+  >
+): string | undefined {
+  const { e164, notSharingPhoneNumber = false } = attributes;
+
+  if (notSharingPhoneNumber && !isInSystemContacts(attributes)) {
+    return undefined;
+  }
+
+  return e164;
+}