Question

I would like to provide user possibility to select application language on login. But since we are using spring security I am really not sure how to get selected language parameter from request parameters?

Is there any way to intercept spring security authentication process without modifying the process itself (cause I have found some examples with custom authentication, but I don’t need that at the moment)?

Or what would be the best practise to retrieve request parameter before it is redirected further? Thanks.

Answer 1

You can setup your own (instead of default) Authentication Success Handler at resources.groovy:

authenticationSuccessHandler(MyAuthenticationSuccessHandler) {
}

where MyAuthenticationSuccessHandler is class that implements AuthenticationSuccessHandler, or better to extends AjaxAwareAuthenticationSuccessHandler that is used by default, like:

authenticationSuccessHandler(AjaxAwareAuthenticationSuccessHandler) {
    requestCache = ref('requestCache')
    defaultTargetUrl = conf.successHandler.defaultTargetUrl // '/'
    alwaysUseDefaultTargetUrl = conf.successHandler.alwaysUseDefault // false
    targetUrlParameter = conf.successHandler.targetUrlParameter // 'spring-security-redirect'
    ajaxSuccessUrl = conf.successHandler.ajaxSuccessUrl // '/login/ajaxSuccess'
    useReferer = conf.successHandler.useReferer // false
    redirectStrategy = ref('redirectStrategy')
}

This class have access to actual request at:

void onAuthenticationSuccess(HttpServletRequest request, HttpServletResponse response,
        Authentication authentication) throws IOException, ServletException;