GarciaPL Notes - Java and Others

Some of you may use Spring Security in your application. Let's assume that your application is localized for many different languages. In this post I would like to give you some solution for case when user loggs into your application and should be redirected to specified address with appropriate locale for that user. I think, because I am not sure that in this case LocaleResolver would not work because before user loggs in, you will receive for instance English locale which depends on what configuration is on your server. In this case you need to use CookieLocaleResolver. Another assumption - I hope that your app uses cookies.

package com.garciapl.security;

import org.springframework.security.core.AuthenticationException;
import org.springframework.security.web.DefaultRedirectStrategy;
import org.springframework.security.web.authentication.AuthenticationFailureHandler;
import org.springframework.security.web.authentication.SimpleUrlAuthenticationFailureHandler;
import org.springframework.web.servlet.i18n.CookieLocaleResolver;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.Locale;

public class AuthenticationFailureImpl extends SimpleUrlAuthenticationFailureHandler implements AuthenticationFailureHandler {

    private String defaultFailureUrl;
    private String langToken = "?lang=";
    private CookieLocaleResolver localeResolver;

    @Override
    public void onAuthenticationFailure(HttpServletRequest request, HttpServletResponse response, AuthenticationException exception) throws IOException, ServletException {

        Locale requestLocale = localeResolver.resolveLocale(request);
        saveException(request, exception);
        if (requestLocale != null) {
            new DefaultRedirectStrategy().sendRedirect(request, response, defaultFailureUrl + langToken + requestLocale.getLanguage());
        } else {
            new DefaultRedirectStrategy().sendRedirect(request, response, defaultFailureUrl + langToken + Locale.ENGLISH.getLanguage());
        }
    }

    public void setDefaultFailureUrl(String defaultFailureUrl) {
        this.defaultFailureUrl = defaultFailureUrl;
    }

    public void setLocaleResolver(CookieLocaleResolver localeResolver) {
        this.localeResolver = localeResolver;
    }
}