1 files changed, 93 insertions, 0 deletions
diff --git a/server/sonar-web/src/main/js/helpers/l10nBundle.ts b/server/sonar-web/src/main/js/helpers/l10nBundle.ts
new file mode 100644
index 00000000000..fc1a4414d57
--- /dev/null
+++ b/server/sonar-web/src/main/js/helpers/l10nBundle.ts
@@ -0,0 +1,93 @@
+/*
+ * SonarQube
+ * Copyright (C) 2009-2022 SonarSource SA
+ * mailto:info AT sonarsource DOT com
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 3 of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ */
+
+import { fetchL10nBundle } from '../api/l10n';
+import { L10nBundle, L10nBundleRequestParams } from '../types/l10nBundle';
+import { toNotSoISOString } from './dates';
+
+const DEFAULT_LOCALE = 'en';
+const DEFAULT_MESSAGES = {
+  // eslint-disable-next-line camelcase
+  default_error_message: 'The request cannot be processed. Try again later.'
+};
+
+export function getMessages() {
+  return getL10nBundleFromCache().messages ?? DEFAULT_MESSAGES;
+}
+
+export function getCurrentLocale() {
+  return getL10nBundleFromCache().locale;
+}
+
+export function getCurrentL10nBundle() {
+  return getL10nBundleFromCache();
+}
+
+export async function loadL10nBundle() {
+  const browserLocale = getPreferredLanguage();
+  const cachedBundle = getL10nBundleFromCache();
+
+  const params: L10nBundleRequestParams = {};
+
+  if (browserLocale) {
+    params.locale = browserLocale;
+
+    if (
+      cachedBundle.locale &&
+      browserLocale.startsWith(cachedBundle.locale) &&
+      cachedBundle.timestamp &&
+      cachedBundle.messages
+    ) {
+      params.ts = cachedBundle.timestamp;
+    }
+  }
+
+  const { effectiveLocale, messages } = await fetchL10nBundle(params).catch(response => {
+    if (response && response.status === 304) {
+      return {
+        effectiveLocale: cachedBundle.locale || browserLocale || DEFAULT_LOCALE,
+        messages: cachedBundle.messages ?? {}
+      };
+    }
+    throw new Error(`Unexpected status code: ${response.status}`);
+  });
+
+  const bundle = {
+    timestamp: toNotSoISOString(new Date()),
+    locale: effectiveLocale,
+    messages
+  };
+
+  persistL10nBundleInCache(bundle);
+
+  return bundle;
+}
+
+function getPreferredLanguage() {
+  return window.navigator.languages ? window.navigator.languages[0] : window.navigator.language;
+}
+
+function getL10nBundleFromCache() {
+  return ((window as unknown) as any).sonarQubeL10nBundle ?? {};
+}
+
+function persistL10nBundleInCache(bundle: L10nBundle) {
+  ((window as unknown) as any).sonarQubeL10nBundle = bundle;
+}