XSS対策

jetspeed1にはxssの対策が行われていません */フィルターを用いて、スクリプトをURL欄に入力することを防ぐことでxss対策になります

public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException,
            ServletException
    {
        if (request instanceof HttpServletRequest)
        {
            HttpServletRequest hreq = (HttpServletRequest) request;
            if (isInvalid(hreq.getQueryString()) || isInvalid(hreq.getRequestURI()))
            {
                ((HttpServletResponse) response).sendError(HttpServletResponse.SC_BAD_REQUEST);
                return;
            }
        }
        chain.doFilter(request, response);
    }

    private boolean isInvalid(String value)
    {
        return (value != null && (value.indexOf('<') != -1 || value.indexOf('>') != -1 || value.indexOf("%3C") != -1
                || value.indexOf("%3c") != -1 || value.indexOf("%3E") != -1 || value.indexOf("%3e") != -1));
    }