TF-2215 Support communicating L18n to remote servers

Signed-off-by: dab246 <tdvu@linagora.com>
(cherry picked from commit 21b69c6ac0bada69c63b87a17fc42c730ce12762)

lib/main.dart

@@ -64,7 +64,7 @@ class TMailApp extends StatelessWidget {
         }
         return supportedLocales.first;
       },
-      locale: LocalizationService.locale,
+      locale: LocalizationService.getLocaleFromLanguage(),
       fallbackLocale: LocalizationService.fallbackLocale,
       translations: LocalizationService(),
       onGenerateTitle: (context) {

lib/main/bindings/network/network_bindings.dart

@@ -29,6 +29,7 @@ import 'package:tmail_ui_user/features/quotas/data/network/quotas_api.dart';
 import 'package:tmail_ui_user/features/session/data/network/session_api.dart';
 import 'package:tmail_ui_user/features/thread/data/network/thread_api.dart';
 import 'package:tmail_ui_user/main/exceptions/remote_exception_thrower.dart';
+import 'package:tmail_ui_user/main/localizations/locale_interceptor.dart';
 import 'package:uuid/uuid.dart';
 
 class NetworkBindings extends Bindings {
@@ -69,11 +70,13 @@ class NetworkBindings extends Bindings {
         Get.find<TokenOidcCacheManager>(),
         Get.find<AccountCacheManager>(),
     ));
+    Get.put(LocaleInterceptor());
     Get.find<Dio>().interceptors.add(Get.find<DynamicUrlInterceptors>());
     Get.find<Dio>().interceptors.add(Get.find<AuthorizationInterceptors>());
     if (kDebugMode) {
       Get.find<Dio>().interceptors.add(LogInterceptor(requestBody: true));
     }
+    Get.find<Dio>().interceptors.add(Get.find<LocaleInterceptor>());
   }
 
   void _bindingApi() {

lib/main/bindings/network/network_isolate_binding.dart

@@ -14,6 +14,7 @@ import 'package:tmail_ui_user/features/mailbox/data/network/mailbox_isolate_work
 import 'package:tmail_ui_user/features/thread/data/network/thread_api.dart';
 import 'package:tmail_ui_user/features/thread/data/network/thread_isolate_worker.dart';
 import 'package:tmail_ui_user/main/bindings/network/binding_tag.dart';
+import 'package:tmail_ui_user/main/localizations/locale_interceptor.dart';
 import 'package:uuid/uuid.dart';
 import 'package:worker_manager/worker_manager.dart';
 
@@ -47,6 +48,7 @@ class NetworkIsolateBindings extends Bindings {
     if (kDebugMode) {
       dio.interceptors.add(LogInterceptor(requestBody: true));
     }
+    dio.interceptors.add(Get.find<LocaleInterceptor>());
   }
 
   void _bindingApi() {

lib/main/localizations/locale_interceptor.dart

@@ -0,0 +1,17 @@
+import 'dart:io';
+
+import 'package:core/utils/app_logger.dart';
+import 'package:dio/dio.dart';
+import 'package:tmail_ui_user/main/localizations/localization_service.dart';
+
+class LocaleInterceptor extends InterceptorsWrapper {
+
+  @override
+  void onRequest(RequestOptions options, RequestInterceptorHandler handler) {
+    final currentLocale = LocalizationService.getLocaleFromLanguage();
+    log('LocaleInterceptor::onRequest:currentLocale: $currentLocale');
+    options.headers[HttpHeaders.acceptLanguageHeader] = LocalizationService.supportedLocalesToLanguageTags();
+    options.headers[HttpHeaders.contentLanguageHeader] = currentLocale.toLanguageTag();
+    super.onRequest(options, handler);
+  }
+}

lib/main/localizations/localization_service.dart

@@ -5,6 +5,7 @@ import 'package:core/utils/app_logger.dart';
 import 'package:get/get.dart';
 import 'package:tmail_ui_user/features/manage_account/data/local/language_cache_manager.dart';
 import 'package:tmail_ui_user/main/localizations/language_code_constants.dart';
+import 'package:tmail_ui_user/main/routes/route_navigation.dart';
 
 class LocalizationService extends Translations {
 
@@ -29,30 +30,34 @@ class LocalizationService extends Translations {
     Locale(LanguageCodeConstants.italian, 'IT')
   ];
 
-  static final locale = _getLocaleFromLanguage();
-
   static void changeLocale(String langCode) {
-    log('LocalizationService::changeLocale(): langCode: $langCode');
-    final locale = _getLocaleFromLanguage(langCode: langCode);
-    Get.updateLocale(locale);
+    log('LocalizationService::changeLocale():langCode: $langCode');
+    final newLocale = getLocaleFromLanguage(langCode: langCode);
+    log('LocalizationService::changeLocale():newLocale: $newLocale');
+    Get.updateLocale(newLocale);
   }
 
-  static Locale _getLocaleFromLanguage({String? langCode}) {
-    final languageCacheManager = Get.find<LanguageCacheManager>();
-    final localeStored = languageCacheManager.getStoredLanguage();
-
-    log('LocalizationService::_getLocaleFromLanguage(): localeStored: ${localeStored.toString()}');
-
+  static Locale getLocaleFromLanguage({String? langCode}) {
+    final languageCacheManager = getBinding<LanguageCacheManager>();
+    log('LocalizationService::_getLocaleFromLanguage:languageCacheManager: $languageCacheManager');
+    final localeStored = languageCacheManager?.getStoredLanguage();
+    log('LocalizationService::_getLocaleFromLanguage():localeStored: $localeStored');
     if (localeStored != null) {
       return localeStored;
     } else {
       final languageCodeCurrent = langCode ?? Get.deviceLocale?.languageCode;
-      final localeSelected = supportedLocales
-          .firstWhereOrNull((locale) => locale.languageCode == languageCodeCurrent);
-      return localeSelected ?? Get.locale ?? defaultLocale;
+      log('LocalizationService::_getLocaleFromLanguage():languageCodeCurrent: $languageCodeCurrent');
+      final localeSelected = supportedLocales.firstWhereOrNull((locale) => locale.languageCode == languageCodeCurrent);
+      return localeSelected ?? Get.deviceLocale ?? defaultLocale;
     }
   }
 
+  static String supportedLocalesToLanguageTags() {
+    final listLanguageTags = supportedLocales.map((locale) => locale.toLanguageTag()).join(', ');
+    log('LocalizationService::supportedLocalesToLanguageTags:listLanguageTags: $listLanguageTags');
+    return listLanguageTags;
+  }
+
   @override
   Map<String, Map<String, String>> get keys => {};
 }