SessionCheckFilter

SessionCheckFilter.java

/**
 * Servlet filter that enforces the existence of an session in order to continue.
 * @author Marvin S. Addison
 */
public class SessionCheckFilter implements Filter {
  @Override
  public void init(FilterConfig filterConfig) throws ServletException {

  }

  @Override
  public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
    final HttpServletRequest request = (HttpServletRequest) servletRequest;
    final HttpSession session = request.getSession(false);
    if (session == null) {
      final HttpServletResponse response = (HttpServletResponse) servletResponse;
      response.sendError(403);
      return;
    }
    filterChain.doFilter(servletRequest, servletResponse);
  }

  @Override
  public void destroy() {

  }
}