New compose UX for usernames/e164

Co-authored-by: Jamie Kyle <113370520+jamiebuilds-signal@users.noreply.github.com>

ts/util/getCountryData.ts

@@ -0,0 +1,89 @@
+// Copyright 2024 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
+import memoizee from 'memoizee';
+
+import { instance } from './libphonenumberInstance';
+
+export type CountryDataType = Readonly<{
+  region: string;
+  displayName: string;
+  code: string;
+}>;
+
+// See https://github.com/signalapp/Signal-iOS-Private/blob/e788a20db08d724eb3013f49b84b06da6d8c7b5c/SignalServiceKit/src/Contacts/PhoneNumberUtil.swift#L22-L70
+function getCountryCodeForRegion(region: string): string {
+  let code: number;
+  if (region === 'AQ') {
+    // Antarctica
+    code = 672;
+  } else if (region === 'BV') {
+    // Bouvet Island
+    code = 55;
+  } else if (region === 'IC') {
+    // Canary Islands
+    code = 34;
+  } else if (region === 'EA') {
+    // Ceuta & Melilla
+    code = 34;
+  } else if (region === 'CP') {
+    // Clipperton Island
+    //
+    // This country code should be filtered - it does not appear to have a calling code.
+    throw new Error(`Unsupported country region: ${region}`);
+  } else if (region === 'DG') {
+    // Diego Garcia
+    code = 246;
+  } else if (region === 'TF') {
+    // French Southern Territories
+    code = 262;
+  } else if (region === 'HM') {
+    // Heard & McDonald Islands
+    code = 672;
+  } else if (region === 'XK') {
+    // Kosovo
+    code = 383;
+  } else if (region === 'PN') {
+    // Pitcairn Islands
+    code = 64;
+  } else if (region === 'GS') {
+    // So. Georgia & So. Sandwich Isl.
+    code = 500;
+  } else if (region === 'UM') {
+    // U.S. Outlying Islands
+    code = 1;
+  } else {
+    code = instance.getCountryCodeForRegion(region);
+    if (code == null) {
+      throw new Error(`Unsupported country region: ${region}`);
+    }
+  }
+
+  return `+${code}`;
+}
+
+function computeCountryDataForLocale(
+  locale: string
+): ReadonlyArray<CountryDataType> {
+  const map = window.SignalContext.getCountryDisplayNames()[locale];
+
+  const list = Object.entries(map).map(([region, displayName]) => {
+    return {
+      region,
+      displayName,
+      code: getCountryCodeForRegion(region),
+    };
+  });
+
+  list.sort((a, b) => {
+    if (a.displayName === b.displayName) {
+      return 0;
+    }
+
+    return a.displayName < b.displayName ? -1 : 1;
+  });
+
+  return list;
+}
+
+export const getCountryDataForLocale = memoizee(computeCountryDataForLocale);