From 2d44ba0431eda7ae155cef7a797c1fc130ebb9ac Mon Sep 17 00:00:00 2001
From: Nishant Kaushik <nishantkaushikadobe@gmail.com>
Date: Thu, 16 Jul 2026 13:35:07 +0530
Subject: [PATCH] Add fallback locales + try catch block for fetchign core
 dependencies

---
 libs/navigation/federal-locales-fallback.js | 106 ++++++++++++++++++++
 libs/navigation/navigation.js               |  45 +++++++--
 2 files changed, 141 insertions(+), 10 deletions(-)
 create mode 100644 libs/navigation/federal-locales-fallback.js

diff --git a/libs/navigation/federal-locales-fallback.js b/libs/navigation/federal-locales-fallback.js
new file mode 100644
index 00000000000..69baf7b7d09
--- /dev/null
+++ b/libs/navigation/federal-locales-fallback.js
@@ -0,0 +1,106 @@
+/*
+ * Snapshot of federal/utils/locales.js, vendored as a fallback for when the
+ * live cross-origin fetch in navigation.js (resolveLocales) fails (CORS,
+ * network error, federal origin down). Pulled from
+ * https://main--federal--adobecom.aem.page/federal/utils/locales.js.
+ * This is a point-in-time copy and will drift from the source over time;
+ * update it periodically rather than treating it as authoritative.
+ */
+export default {
+  '': { ietf: 'en-US', tk: 'hah7vzn.css' },
+  ae_ar: { ietf: 'ar-AE', tk: 'lpk1hwn.css', dir: 'rtl' },
+  ae_en: { ietf: 'en', tk: 'hah7vzn.css' },
+  africa: { ietf: 'en', tk: 'hah7vzn.css' },
+  ar: { ietf: 'es-AR', tk: 'hah7vzn.css' },
+  at: { ietf: 'de-AT', tk: 'hah7vzn.css' },
+  au: { ietf: 'en-AU', tk: 'hah7vzn.css' },
+  be_en: { ietf: 'en-BE', tk: 'hah7vzn.css' },
+  be_fr: { ietf: 'fr-BE', tk: 'hah7vzn.css', base: 'fr' },
+  be_nl: { ietf: 'nl-BE', tk: 'qxw8hzm.css' },
+  bg: { ietf: 'bg-BG', tk: 'qxw8hzm.css' },
+  br: { ietf: 'pt-BR', tk: 'hah7vzn.css' },
+  ca_fr: { ietf: 'fr-CA', tk: 'hah7vzn.css', base: 'fr' },
+  ca: { ietf: 'en-CA', tk: 'hah7vzn.css' },
+  ch_de: { ietf: 'de-CH', tk: 'hah7vzn.css' },
+  ch_fr: { ietf: 'fr-CH', tk: 'hah7vzn.css', base: 'fr' },
+  ch_it: { ietf: 'it-CH', tk: 'hah7vzn.css' },
+  cl: { ietf: 'es-CL', tk: 'hah7vzn.css' },
+  cn: { ietf: 'zh-CN', tk: 'qxw8hzm' },
+  co: { ietf: 'es-CO', tk: 'hah7vzn.css' },
+  cr: { ietf: 'es-419', tk: 'hah7vzn.css' },
+  cy_en: { ietf: 'en-CY', tk: 'hah7vzn.css' },
+  cz: { ietf: 'cs-CZ', tk: 'qxw8hzm.css' },
+  de: { ietf: 'de-DE', tk: 'hah7vzn.css' },
+  dk: { ietf: 'da-DK', tk: 'qxw8hzm.css' },
+  ec: { ietf: 'es-419', tk: 'hah7vzn.css' },
+  ee: { ietf: 'et-EE', tk: 'qxw8hzm.css' },
+  eg_ar: { ietf: 'ar', tk: 'qxw8hzm.css', dir: 'rtl' },
+  eg_en: { ietf: 'en-GB', tk: 'hah7vzn.css' },
+  el: { ietf: 'el', tk: 'qxw8hzm.css' },
+  es: { ietf: 'es-ES', tk: 'hah7vzn.css' },
+  fi: { ietf: 'fi-FI', tk: 'qxw8hzm.css' },
+  fr: { ietf: 'fr-FR', tk: 'hah7vzn.css' },
+  gr_el: { ietf: 'el', tk: 'qxw8hzm.css' },
+  gr_en: { ietf: 'en-GR', tk: 'hah7vzn.css' },
+  gt: { ietf: 'es-419', tk: 'hah7vzn.css' },
+  hk_en: { ietf: 'en-HK', tk: 'hah7vzn.css' },
+  hk_zh: { ietf: 'zh-HK', tk: 'jay0ecd' },
+  hu: { ietf: 'hu-HU', tk: 'qxw8hzm.css' },
+  id_en: { ietf: 'en', tk: 'hah7vzn.css' },
+  id_id: { ietf: 'id', tk: 'qxw8hzm.css' },
+  ie: { ietf: 'en-GB', tk: 'hah7vzn.css' },
+  il_en: { ietf: 'en-IL', tk: 'hah7vzn.css' },
+  il_he: { ietf: 'he', tk: 'qxw8hzm.css', dir: 'rtl' },
+  in_hi: { ietf: 'hi', tk: 'qxw8hzm.css' },
+  in: { ietf: 'en-GB', tk: 'hah7vzn.css' },
+  it: { ietf: 'it-IT', tk: 'hah7vzn.css' },
+  jp: { ietf: 'ja-JP', tk: 'dvg6awq' },
+  kr: { ietf: 'ko-KR', tk: 'qjs5sfm' },
+  kw_ar: { ietf: 'ar', tk: 'qxw8hzm.css', dir: 'rtl' },
+  kw_en: { ietf: 'en-GB', tk: 'hah7vzn.css' },
+  la: { ietf: 'es-LA', tk: 'hah7vzn.css' },
+  langstore: { ietf: 'en-US', tk: 'hah7vzn.css' },
+  lt: { ietf: 'lt-LT', tk: 'qxw8hzm.css' },
+  lu_de: { ietf: 'de-LU', tk: 'hah7vzn.css' },
+  lu_en: { ietf: 'en-LU', tk: 'hah7vzn.css' },
+  lu_fr: { ietf: 'fr-LU', tk: 'hah7vzn.css', base: 'fr' },
+  lv: { ietf: 'lv-LV', tk: 'qxw8hzm.css' },
+  mena_ar: { ietf: 'ar', tk: 'qxw8hzm.css', dir: 'rtl' },
+  mena_en: { ietf: 'en', tk: 'hah7vzn.css' },
+  mt: { ietf: 'en-MT', tk: 'hah7vzn.css' },
+  mx: { ietf: 'es-MX', tk: 'hah7vzn.css' },
+  my_en: { ietf: 'en-GB', tk: 'hah7vzn.css' },
+  my_ms: { ietf: 'ms', tk: 'qxw8hzm.css' },
+  ng: { ietf: 'en-GB', tk: 'hah7vzn.css' },
+  nl: { ietf: 'nl-NL', tk: 'qxw8hzm.css' },
+  no: { ietf: 'no-NO', tk: 'qxw8hzm.css' },
+  nz: { ietf: 'en-GB', tk: 'hah7vzn.css' },
+  pe: { ietf: 'es-PE', tk: 'hah7vzn.css' },
+  ph_en: { ietf: 'en', tk: 'hah7vzn.css' },
+  ph_fil: { ietf: 'fil-PH', tk: 'qxw8hzm.css' },
+  pl: { ietf: 'pl-PL', tk: 'qxw8hzm.css' },
+  pr: { ietf: 'es-419', tk: 'hah7vzn.css' },
+  pt: { ietf: 'pt-PT', tk: 'hah7vzn.css' },
+  qa_ar: { ietf: 'ar', tk: 'qxw8hzm.css', dir: 'rtl' },
+  qa_en: { ietf: 'en-GB', tk: 'hah7vzn.css' },
+  ro: { ietf: 'ro-RO', tk: 'qxw8hzm.css' },
+  ru: { ietf: 'ru-RU', tk: 'qxw8hzm.css' },
+  sa_ar: { ietf: 'ar', tk: 'qxw8hzm.css', dir: 'rtl' },
+  sa_en: { ietf: 'en', tk: 'hah7vzn.css' },
+  se: { ietf: 'sv-SE', tk: 'qxw8hzm.css' },
+  sg: { ietf: 'en-SG', tk: 'hah7vzn.css' },
+  si: { ietf: 'sl-SI', tk: 'qxw8hzm.css' },
+  sk: { ietf: 'sk-SK', tk: 'qxw8hzm.css' },
+  th_en: { ietf: 'en', tk: 'hah7vzn.css' },
+  th_th: { ietf: 'th', tk: 'lqo2bst.css' },
+  tr: { ietf: 'tr-TR', tk: 'qxw8hzm.css' },
+  tw: { ietf: 'zh-TW', tk: 'jay0ecd' },
+  ua: { ietf: 'uk-UA', tk: 'qxw8hzm.css' },
+  uk: { ietf: 'en-GB', tk: 'hah7vzn.css' },
+  vn_en: { ietf: 'en-GB', tk: 'hah7vzn.css' },
+  vn_vi: { ietf: 'vi', tk: 'qxw8hzm.css' },
+  za: { ietf: 'en-GB', tk: 'hah7vzn.css' },
+  cis_en: { ietf: 'en', tk: 'rks2kng.css' },
+  cis_ru: { ietf: 'ru', tk: 'qxw8hzm.css' },
+  sea: { ietf: 'en', tk: 'hah7vzn.css' },
+};
diff --git a/libs/navigation/navigation.js b/libs/navigation/navigation.js
index 1658ff29321..0af0c914f2c 100644
--- a/libs/navigation/navigation.js
+++ b/libs/navigation/navigation.js
@@ -47,7 +47,18 @@ async function loadFederalLocales(env) {
 }
 
 async function resolveLocales(env, localesOverride) {
-  return localesOverride ?? loadFederalLocales(env);
+  if (localesOverride) return localesOverride;
+  try {
+    return await loadFederalLocales(env);
+  } catch (e) {
+    window.lana?.log(`Failed to load federal locales, falling back to defaults | ${e.message}`, {
+      clientId: 'feds-milo',
+      tags: 'standalone-gnav',
+      severity: 'error',
+    });
+    const { default: fallbackLocales } = await import('./federal-locales-fallback.js');
+    return fallbackLocales;
+  }
 }
 
 const getStageDomainsMap = (stageDomainsMap, env) => {
@@ -146,15 +157,29 @@ export default async function loadBlock(configs, customLib) {
   }
 
   const origin = getStandaloneNavOrigin(env);
-  const [
-    { default: bootstrapBlock },
-    locales,
-    { setConfig, getConfig, createTag },
-  ] = await Promise.all([
-    import('./bootstrapper.js'),
-    resolveLocales(env, configs?.locales),
-    import('../utils/utils.js'),
-  ]);
+  let core;
+  try {
+    const [
+      { default: bootstrapBlock },
+      locales,
+      { setConfig, getConfig, createTag },
+    ] = await Promise.all([
+      import('./bootstrapper.js'),
+      resolveLocales(env, configs?.locales),
+      import('../utils/utils.js'),
+    ]);
+    core = { bootstrapBlock, locales, setConfig, getConfig, createTag };
+  } catch (e) {
+    window.lana?.log(`Global navigation Error: failed to load core navigation dependencies | ${e.message} | href: ${window.location.href}`, {
+      clientId: 'feds-milo',
+      tags: 'standalone-gnav',
+      severity: 'error',
+    });
+    header?.onError?.(e);
+    footer?.onError?.(e);
+    return;
+  }
+  const { bootstrapBlock, locales, setConfig, getConfig, createTag } = core;
   const paramConfigs = getParamsConfigs(configs);
   const clientConfig = {
     theme,