package org.restafarian.core.security;

 import javax.servlet.ServletContext;

 import javax.servlet.http.HttpServletRequest;

 import javax.servlet.http.HttpServletResponse;

 import org.apache.commons.configuration.Configuration;

 import org.apache.commons.logging.Log;

 import org.apache.commons.logging.LogFactory;

 import org.restafarian.core.beans.Person;

 /**

  * <p>This interface specifies the required methods for an authenticated

  * user manager.</p>

  */

 public class DefaultUserManager implements UserManager {

         private Log log = LogFactory.getLog(getClass());

         /**

          * <p>Initializes the module using the configuration.</p>

          *

          * @param context the <code>ServletContext</code> object

          * @param config the <code>Configuration</code> object

          */

         public void init(ServletContext context, Configuration config) {

                 log.info("Initializing the DefaultUserManager.");

         }

         /**

          * <p>Returns the currently authenticated user, or null, if there is

          * no user currently authenticated.</p>

          *

          * @param req the <code>HttpServletRequest</code> object

          * @return the currently authenticated user

          */

         public Person getAuthenticatedUser(HttpServletRequest req) {

                 Person user = null;

                 if (req.getRemoteUser() != null) {

                         user = new Person();

                         user.setId(req.getRemoteUser());

                         user.setUri(getServerRoot(req) + "/id/user/" + req.getRemoteUser());

                         user.setName(req.getRemoteUser());

                 }

                 return user;

         }

         /**

          * <p>Sets the currently authenticated user.</p>

          *

          * @param req the <code>HttpServletRequest</code> object

          * @param res the <code>HttpServletResponse</code> object

          * @param user the currently authenticated user

          */

         public void setAuthenticatedUser(HttpServletRequest req, HttpServletResponse res, Person user) {

                 // default implementation does nothing

         }

         /**

          * <p>Computes the root URL of this server.</p>

          *

          * @param req the <code>HttpServletRequest</code> object

          * @return the root URL of this server

          */

         private String getServerRoot(HttpServletRequest req) {

                 String[] parts = req.getRequestURL().toString().split("/");

                 return parts[0] + "//" + parts[2];

         }

 }