--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/flys-client/src/main/java/org/dive4elements/river/client/server/LoginServlet.java	Thu Apr 25 12:31:32 2013 +0200
@@ -0,0 +1,120 @@
+package de.intevation.flys.client.server;
+
+import java.io.IOException;
+
+import javax.servlet.ServletException;
+import javax.servlet.ServletContext;
+import javax.servlet.http.HttpServlet;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+import javax.servlet.http.HttpSession;
+
+import org.apache.log4j.Logger;
+
+import de.intevation.flys.client.server.auth.Authentication;
+import de.intevation.flys.client.server.auth.AuthenticationException;
+import de.intevation.flys.client.server.auth.AuthenticationFactory;
+import de.intevation.flys.client.server.auth.User;
+import de.intevation.flys.client.server.auth.UserClient;
+import de.intevation.flys.client.server.features.Features;
+
+public class LoginServlet extends HttpServlet {
+
+    private static Logger logger = Logger.getLogger(LoginServlet.class);
+
+    private static final String FLYS_PAGE = "FLYS.html";
+    private static final String LOGIN_PAGE = "login.jsp";
+
+    private void redirectFailure(HttpServletResponse resp, String path)
+        throws IOException {
+        resp.sendRedirect(path + "/" + LOGIN_PAGE);
+    }
+
+    private void redirectFailure(HttpServletResponse resp, String path,
+            Exception e) throws IOException {
+        this.redirectFailure(resp, path, e.getMessage());
+    }
+
+    private void redirectFailure(HttpServletResponse resp, String path,
+            String message) throws IOException {
+        resp.sendRedirect(path + "/" + LOGIN_PAGE + "?error=" + message);
+    }
+
+    private void redirectSuccess(HttpServletResponse resp, String path,
+            String uri) throws IOException {
+        if (uri == null) {
+            String redirecturl = getServletContext().getInitParameter("redirect-url");
+            if (redirecturl == null) {
+                redirecturl = FLYS_PAGE;
+            }
+            uri = "/" + redirecturl;
+        }
+        resp.sendRedirect(uri);
+    }
+
+    @Override
+    protected void doGet(HttpServletRequest req, HttpServletResponse resp)
+    throws ServletException, IOException {
+        logger.debug("Processing get request");
+        this.redirectFailure(resp, req.getContextPath());
+    }
+
+    @Override
+    protected void doPost(HttpServletRequest req, HttpServletResponse resp)
+    throws ServletException, IOException
+    {
+        String encoding = req.getCharacterEncoding();
+        String username = req.getParameter("username");
+        String password = req.getParameter("password");
+
+        logger.debug("Processing post request");
+
+        if (username == null || password == null) {
+            logger.debug("No username or password provided");
+            this.redirectFailure(resp, req.getContextPath());
+            return;
+        }
+
+        try {
+            Authentication aresp = this.auth(username, password, encoding);
+            if (aresp == null || !aresp.isSuccess()) {
+                logger.debug("Authentication not successful");
+                this.redirectFailure(resp, req.getContextPath());
+                return;
+            }
+            User user = aresp.getUser();
+
+            String url = getServletContext().getInitParameter("server-url");
+            UserClient client = new UserClient(url);
+            if (!client.userExists(user)) {
+                logger.debug("Creating db user");
+                if (!client.createUser(user)) {
+                    this.redirectFailure(resp, req.getContextPath(),
+                            "Could not create new user");
+                    return;
+                }
+            }
+
+            HttpSession session = req.getSession();
+            session.setAttribute("user", user);
+
+            String uri = (String)session.getAttribute("requesturi");
+
+            this.redirectSuccess(resp, req.getContextPath(), uri);
+        }
+        catch(AuthenticationException e) {
+            logger.error(e, e);
+            this.redirectFailure(resp, req.getContextPath(), e);
+        }
+    }
+
+    private Authentication auth(String username, String password, String encoding)
+        throws AuthenticationException, IOException
+    {
+        ServletContext sc = this.getServletContext();
+        Features features = (Features)sc.getAttribute(Features.CONTEXT_ATTRIBUTE);
+        String auth = sc.getInitParameter("authentication");
+        return AuthenticationFactory.getInstance(auth).auth(username, password,
+                encoding, features);
+    }
+}