How to bootstrap custom locale resolver to validator in a quarkus rest api application - hibernate-validator

Question

I've created a custom locale resolver for the purpose of internationalization of quarkus rest application. Since I'm new to quarkus, could you please let me know where should I write the following bootstrap code in the application,
ValidatorFactory validatorFactory = Validation.byProvider(HibernateValidator.class)
.configure()
.localeResolver(customlocaleresolver)
.locales(Locale.GERMAN, Locale.FRENCH, Locale.ITALIAN)
.defaultLocale(Locale.ENGLISH)
.buildValidatorFactory();
return validatorFactory.getValidator();
Also, how should I make controller class to know that locale has to be resolved before sending the response.Any help is greatly appreciated. Thanks
I referred this link for internationalization - https://in.relation.to/2020/01/23/hibernate-validator-6-1-1-released/
Adding the custom locale resolver, getting null for httpheader from resteasycontext.
public class ResteasyContextLocaleResolver implements LocaleResolver {
#Override
public Locale resolve(LocaleResolverContext context) {
Optional<List<Locale.LanguageRange>> localePriorities = getAcceptableLanguages();
if (!localePriorities.isPresent()) {
return context.getDefaultLocale();
}
List<Locale> resolvedLocales = Locale.filter(localePriorities.get(), context.getSupportedLocales());
if (resolvedLocales.size() > 0) {
return resolvedLocales.get(0);
}
return context.getDefaultLocale();
}
private Optional<List<Locale.LanguageRange>> getAcceptableLanguages() {
HttpHeaders httpHeaders = ResteasyContext.getContextData(HttpHeaders.class);
if (httpHeaders != null) {
List<String> acceptLanguageList = httpHeaders.getRequestHeader("Accept-Language");
if (acceptLanguageList != null && !acceptLanguageList.isEmpty()) {
return Optional.of(Locale.LanguageRange.parse(acceptLanguageList.get(0)));
}
}
return Optional.empty();
}
}

Answer 1

This is documented in the Hibernate Validator guide for Quarkus:
You can configure this behavior by adding the following configuration in your application.properties:
# The default locale to use
quarkus.default-locale=fr-FR
If you are using RESTEasy Reactive, in the context of a JAX-RS endpoint, Hibernate Validator will automatically resolve the optimal locale to use from the Accept-Language HTTP header, provided the supported locales have been properly specified in the application.properties:
# The list of all the supported locales
quarkus.locales=en-US,es-ES,fr-FR
If the built-in feature that resolves the locale from the Accept-Language HTTP header suits your needs, then you do not need a custom locale resolver.
If that built-in feature isn't enough for some reason, you can declare your locale resolver as a CDI bean and it should get automatically picked up:
#ApplicationScoped
public class MyLocaleResolver implements LocaleResolver {
// ...
}
If that doesn't work for some reason, you can probably use a ValidatorFactoryCustomizer:
#ApplicationScoped
public class MyValidatorFactoryCustomizer implements ValidatorFactoryCustomizer {
#Override
public void customize(BaseHibernateValidatorConfiguration<?> configuration) {
configuration.localeResolver(customlocaleresolver);
}
}
That last solution will, however, completely override any built-in locale resolver: the Accept-Language HTTP header will get completely ignored.