public class RestUsernamePasswordAuthenticationFilter extends
            UsernamePasswordAuthenticationFilter {
    private final Logger log = LoggerFactory.getLogger(this.getClass()
            .getName());

    static final String ORIGIN = "Origin";

    @Override
    public Authentication attemptAuthentication(HttpServletRequest request, HttpServletResponse response){

        String originHeader = request.getHeader(ORIGIN);

        log.debug(">> request.getHeader()::"+originHeader);
        log.debug(">> request.getMethod()::"+request.getMethod());
        String jsonReQuestBody = extractPostRequestBody(request);
        log.debug(">> request.body " + jsonReQuestBody);
        JsonObject requestJsonBody = new Gson().fromJson(jsonReQuestBody, JsonObject.class);
        Iterator<Entry<String, JsonElement>>  jsonIterator = requestJsonBody.entrySet().iterator();
        String userName = null;
        String password = null;
        String serviceLocationId = null;
        while (jsonIterator.hasNext()){
            Entry<String,JsonElement> entry= jsonIterator.next();
            String key = entry.getKey();
            JsonElement value = entry.getValue();
            log.debug(">> key " + key + "value" + value.getAsString());
            if (key != null && key.trim().equalsIgnoreCase("j_username")){
                userName = value.getAsString();
            }else if (key != null && key.trim().equalsIgnoreCase("j_password")){
                password = value.getAsString();
            }else if (key != null && key.trim().equalsIgnoreCase("j_service_location_uid")){
                serviceLocationId = value.getAsString();
            }

        }
        if (request.getMethod().equalsIgnoreCase("OPTIONS")) {
            try {
                response.getWriter().print("OK");
                response.getWriter().flush();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }

            return  null;

        }
        UsernamePasswordAuthenticationToken authRequest = new UsernamePasswordAuthenticationToken(userName, password);
        request.setAttribute("j_service_location_uid", serviceLocationId);
        // Allow subclasses to set the "details" property
        setDetails(request, authRequest);
        return this.getAuthenticationManager().authenticate(authRequest);
     }

    @SuppressWarnings("resource")
    private String extractPostRequestBody(HttpServletRequest request) {
        if ("POST".equalsIgnoreCase(request.getMethod())) {
            Scanner s = null;
            try {
                s = new Scanner(request.getInputStream(), "UTF-8").useDelimiter("\A");
            } catch (IOException e) {
                e.printStackTrace();
            }
            return s.hasNext() ? s.next() : "";
        }
        return "";
    }

}