felix@4433: package de.intevation.flys.client.server;
felix@4433: 
felix@4433: import java.io.IOException;
felix@4433: import java.util.Enumeration;
felix@4433: 
felix@4433: import javax.servlet.Filter;
felix@4433: import javax.servlet.FilterChain;
felix@4433: import javax.servlet.FilterConfig;
felix@4433: import javax.servlet.ServletContext;
felix@4433: import javax.servlet.ServletException;
felix@4433: import javax.servlet.ServletRequest;
felix@4433: import javax.servlet.ServletResponse;
felix@4433: 
felix@4433: import javax.servlet.http.HttpServletRequest;
felix@4433: import javax.servlet.http.HttpServletResponse;
felix@4433: import javax.servlet.http.HttpSession;
felix@4433: 
felix@4433: import org.apache.log4j.Logger;
felix@4433: 
felix@4433: import de.intevation.flys.client.server.auth.Authentication;
felix@4433: import de.intevation.flys.client.server.auth.AuthenticationException;
felix@4433: import de.intevation.flys.client.server.auth.AuthenticationFactory;
felix@4433: import de.intevation.flys.client.server.auth.User;
felix@4433: import de.intevation.flys.client.server.features.Features;
felix@4433: 
felix@4433: 
felix@4433: /** ServletFilter used for GGInA authentification and certain authorisation. */
felix@4433: public class GGInAFilter implements Filter {
felix@4433: 
felix@4433:     /** Private logger. */
felix@4433:     private static Logger logger = Logger.getLogger(GGInAFilter.class);
felix@4433: 
felix@4433:     private boolean deactivate = false;
felix@4433:     private String authmethod;
felix@4433:     private String redirecturl;
felix@4433:     private ServletContext sc;
felix@4433: 
felix@4433:     public static final String LOGIN_JSP     = "/login.jsp";
felix@4433:     public static final String LOGIN_SERVLET = "/flys/login";
felix@4433:     public static final String FLYS_CSS      = "/FLYS.css";
felix@4433: 
felix@4433: 
felix@4433:     /**
felix@4433:      * Initialize.
felix@4433:      *
felix@4433:      * Read FilterConfig parameter deactivate
felix@4433:      */
felix@4433:     @Override
felix@4433:     public void init(FilterConfig config)
felix@4433:     throws ServletException
felix@4433:     {
felix@4433:         String deactivate = config.getInitParameter("deactivate");
felix@4433:         this.sc = config.getServletContext();
felix@4433:         logger.debug("GGInAFilter context " + this.sc.getContextPath());
felix@4433:         this.authmethod = sc.getInitParameter("authentication");
felix@4433:         this.redirecturl = sc.getInitParameter("redirect-url");
felix@4433:         if (deactivate != null && deactivate.equalsIgnoreCase("true")) {
felix@4433:             this.deactivate = true;
felix@4433:         }
felix@4433: 
felix@4433:     }
felix@4433: 
felix@4433: 
felix@4433:     /**
felix@4433:      * Called when filter in chain invoked.
felix@4433:      * @param req request to servlet
felix@4433:      * @param resp response of servlet
felix@4433:      * @param chain the filter chain
felix@4433:      */
felix@4433:     @Override
felix@4433:     public void doFilter(ServletRequest req, ServletResponse resp, FilterChain chain)
felix@4433:     throws IOException, ServletException
felix@4433:     {
felix@4433:         if (this.deactivate) {
felix@4433:             logger.debug("GGinAFilter is deactivated");
felix@4433:             chain.doFilter(req, resp);
felix@4433:             return;
felix@4433:         }
felix@4433: 
felix@4433:         HttpServletRequest sreq = (HttpServletRequest) req;
felix@4433: 
felix@4433:         String requesturi = sreq.getRequestURI();
felix@4433:         for (Enumeration e = req.getAttributeNames() ; e.hasMoreElements() ;) {
felix@4433:             logger.debug(e.nextElement());
felix@4433:         }
felix@4433: 
felix@4433:         logger.debug("Request for: " + requesturi);
felix@4433: 
felix@4433:         // Allow access to login pages
felix@4433:         // TODO Maybe replace with Filter <url-pattern>
felix@4433:         String path = this.sc.getContextPath();
felix@4433:         if (requesturi.equals(path + "/login.jsp") ||
felix@4433:                 requesturi.equals(path + "/flys/login")
felix@4433:                 || requesturi.equals(path + "/FLYS.css")) {
felix@4433:             logger.debug("Request for login " + requesturi);
felix@4433:             chain.doFilter(req, resp);
felix@4433:             return;
felix@4433:         }
felix@4433: 
felix@4433:         boolean redirect = false;
felix@4433: 
felix@4433:         HttpSession session = sreq.getSession();
felix@4433: 
felix@4433:         String uri = path + "/" + this.redirecturl;
felix@4433: 
felix@4433:         /* Redirect if uri is root or redirecturl */
felix@4433:         if (requesturi.equals(uri) || requesturi.equals(path + "/")) {
felix@4433:             redirect = true;
felix@4433:         }
felix@4433: 
felix@4433:         if (sreq.getQueryString() != null) {
felix@4433:             uri = uri + "?" + sreq.getQueryString();
felix@4433:         }
felix@4433:         session.setAttribute("requesturi", uri);
felix@4433: 
felix@4433:         User user = (User)session.getAttribute("user");
felix@4433:         if (user == null) {
felix@4433:             logger.debug("No user in session: " + requesturi);
felix@4433:             this.handleResponse(resp, redirect);
felix@4433:             return;
felix@4433:         }
felix@4433:         if (user.hasExpired()) {
felix@4433:             // try to re-authenticate the user
felix@4433:             logger.debug("User ticket has expired: " + requesturi);
felix@4433:             String encoding = sreq.getCharacterEncoding();
felix@4433:             try {
felix@4433:                 Authentication auth = this.auth(user, encoding);
felix@4433:                 if (auth == null || !auth.isSuccess()) {
felix@4433:                     logger.debug("Re-athentication not successful");
felix@4433:                     this.handleResponse(resp, redirect);
felix@4433:                 }
felix@4433:             }
felix@4433:             catch(AuthenticationException e) {
felix@4433:                 logger.error("Failure during re-authentication", e);
felix@4433:                 this.handleResponse(resp, redirect);
felix@4433:                 return;
felix@4433:             }
felix@4433:         }
felix@4433: 
felix@4433:         logger.debug("GGInAFilter.doFilter");
felix@4433:         chain.doFilter(req, resp);
felix@4433:         return;
felix@4433:     }
felix@4433: 
felix@4433:     private void redirect(ServletResponse resp) throws IOException {
felix@4433:         logger.debug("Redirect to login");
felix@4433:         ((HttpServletResponse) resp).sendRedirect(this.sc.getContextPath() +
felix@4433:             "/login.jsp");
felix@4433:     }
felix@4433: 
felix@4433:     private void sendNotAuthenticated(ServletResponse resp) throws IOException {
felix@4433:         logger.debug("Send not authenticated");
felix@4433:         ((HttpServletResponse)resp).sendError(HttpServletResponse.SC_FORBIDDEN, "User not authenticated");
felix@4433:     }
felix@4433: 
felix@4433:     private void handleResponse(ServletResponse resp, boolean redirect) throws IOException {
felix@4433:         if (redirect) {
felix@4433:             this.redirect(resp);
felix@4433:         }
felix@4433:         else {
felix@4433:             this.sendNotAuthenticated(resp);
felix@4433:         }
felix@4433:     }
felix@4433: 
felix@4433: 
felix@4433:     /**
felix@4433:      * Do nothing at destruction.
felix@4433:      */
felix@4433:     @Override
felix@4433:     public void destroy() {
felix@4433:     }
felix@4433: 
felix@4433:     private Authentication auth(User user, String encoding)
felix@4433:         throws AuthenticationException, IOException {
felix@4433:         Features features = (Features)sc.getAttribute(Features.CONTEXT_ATTRIBUTE);
felix@4433:         return AuthenticationFactory.getInstance(this.authmethod).auth(
felix@4433:                 user.getName(), user.getPassword(), encoding, features);
felix@4433:     }
felix@4433: }
felix@4433: // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :