/**
    * This file Copyright (c) 2003-2010 Magnolia International
    * Ltd.  (http://www.magnolia-cms.com). All rights reserved.
    *
    *
    * This file is dual-licensed under both the Magnolia
    * Network Agreement and the GNU General Public License.
    * You may elect to use one or the other of these licenses.
    *
   * This file is distributed in the hope that it will be
   * useful, but AS-IS and WITHOUT ANY WARRANTY; without even the
   * implied warranty of MERCHANTABILITY or FITNESS FOR A
   * PARTICULAR PURPOSE, TITLE, or NONINFRINGEMENT.
   * Redistribution, except as permitted by whichever of the GPL
   * or MNA you select, is prohibited.
   *
   * 1. For the GPL license (GPL), you can redistribute and/or
   * modify this file under the terms of the GNU General
   * Public License, Version 3, as published by the Free Software
   * Foundation.  You should have received a copy of the GNU
   * General Public License, Version 3 along with this program;
   * if not, write to the Free Software Foundation, Inc., 51
   * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
   *
   * 2. For the Magnolia Network Agreement (MNA), this file
   * and the accompanying materials are made available under the
   * terms of the MNA which accompanies this distribution, and
   * is available at http://www.magnolia-cms.com/mna.html
   *
   * Any modifications to this file must keep this entire header
   * intact.
   *
   */
  package info.magnolia.cms.security.auth.callback;
  
  import javax.servlet.http.HttpServletResponse;
  import javax.servlet.http.HttpServletRequest;
  import javax.security.auth.login.LoginException;
  
  import java.util.HashMap;
  import java.util.Map;
  
  import info.magnolia.freemarker.FreemarkerUtil;
  import info.magnolia.cms.beans.config.MIMEMapping;
  import info.magnolia.cms.i18n.MessagesManager;
  import info.magnolia.cms.i18n.Messages;
  import info.magnolia.cms.security.auth.login.LoginResult;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  import org.apache.commons.lang.ClassUtils;
  
  /**
   * Sends a login form.
   * @author Sameer Charles
   * $Id: FormClientCallback.java 36890 2010-09-02 11:38:12Z pbaerfuss $
   */
  public class FormClientCallback extends AbstractHttpClientCallback {
  
      private static final Logger log = LoggerFactory.getLogger(FormClientCallback.class);
  
      public static final String ERROR_STRING = "errorString";
  
      private String loginForm;
  
      public void doCallback(HttpServletRequest request, HttpServletResponse response) {
          try {
              if (!response.isCommitted()) {
                  response.setContentType("text/html");
                  if (null == request.getCharacterEncoding()) {
                      response.setCharacterEncoding(MIMEMapping.getContentEncodingOrDefault("text/html"));
                  }
              }
              FreemarkerUtil.process(getLoginForm(), getMessages(), response.getWriter());
          }
          catch (Throwable t) {
              log.error("exception while writing login template", t);
          }
      }
  
      public String getLoginForm() {
          return loginForm;
      }
  
      public void setLoginForm(String loginForm) {
          this.loginForm = loginForm;
      }
  
      /**
       * simply sets "errorString" in case of login exception.
       * override this to pass more objects to the freemarker template.
       * @return an empty map
       */
      protected Map<String, String> getMessages() {
          LoginResult loginResult = LoginResult.getCurrentLoginResult();
          LoginException exception = loginResult.getLoginException();
          Map<String, String> messages = new HashMap<String, String>();
          if (null != exception) {
              final String exName = ClassUtils.getShortClassName(exception, null);
             final Messages mm = MessagesManager.getMessages();
             final String defaultMessage = mm.get("login.defaultError");
             messages.put(ERROR_STRING, mm.getWithDefault("login." + exName, defaultMessage));
         }
         return messages;
     }
 
 }