/**
    * This file Copyright (c) 2011-2013 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.module.exchangesimple.pages;
  
  import info.magnolia.cms.i18n.Messages;
  import info.magnolia.cms.i18n.MessagesManager;
  import info.magnolia.cms.security.AccessDeniedException;
  import info.magnolia.cms.security.AccessManager;
  import info.magnolia.cms.security.MgnlKeyPair;
  import info.magnolia.cms.security.Permission;
  import info.magnolia.cms.security.SecurityUtil;
  import info.magnolia.context.MgnlContext;
  import info.magnolia.module.ModuleRegistry;
  import info.magnolia.module.admininterface.TemplatedMVCHandler;
  import info.magnolia.module.exchangesimple.ExchangeSimpleModule;
  
  import javax.servlet.ServletException;
  import javax.servlet.http.HttpServletRequest;
  import javax.servlet.http.HttpServletResponse;
  
  /**
   * Activation UI.
   *
   * @version $Id$
   */
  public class ActivationPage extends TemplatedMVCHandler {
  
      private int keyLength;
  
      private boolean generateKeys;
  
      private boolean success;
  
      private MgnlKeyPair keyPair;
  
      /**
       * @param name
       * @param request
       * @param response
       */
      public ActivationPage(String name, HttpServletRequest request, HttpServletResponse response) {
          super(name, request, response);
          keyLength = ModuleRegistry.Factory.getInstance().getModuleInstance(ExchangeSimpleModule.class).getActivationKeyLength();
      }
  
      /**
       * @see info.magnolia.cms.servlets.MVCServletHandlerImpl#getCommand()
       */
      @Override
      public String getCommand() {
          if (this.generateKeys) {
              return "generateKeys";
          }
          return super.getCommand();
      }
  
      /**
       * Actually perform backup.
       */
      public String generateKeys() throws Exception {
          if (!checkPermissions(request, "config", "/", Permission.WRITE)) {
              throw new ServletException(new AccessDeniedException(
              "Write permission needed to generate new key. Please try again after logging in with appropriate permissions."));
          }
  
          keyPair = SecurityUtil.generateKeyPair(keyLength);
          SecurityUtil.updateKeys(keyPair);
          this.success = true;
 
         // TODO: distribute key to public instances
 
         return this.show();
     }
 
     //need to retrieve the public key directly (proxy used by SecurityUtil might not be updated yet)
     public String getCurrentPublicKey() {
         if (keyPair != null) {
             return keyPair.getPublicKey();
         }
         return SecurityUtil.getPublicKey();
     }
 
     /**
      * Uses access manager to authorize this request.
      *
      * @param request
      *            HttpServletRequest as received by the service method
      * @return boolean true if read access is granted
      */
     protected boolean checkPermissions(HttpServletRequest request, String repository, String basePath,
             long permissionType) {
 
         AccessManager accessManager = MgnlContext.getAccessManager(repository);
         if (accessManager != null) {
             if (!accessManager.isGranted(basePath, permissionType)) {
                 return false;
             }
         }
         return true;
     }
 
     public Messages getMessages() {
         return MessagesManager.getMessages("info.magnolia.module.exchangesimple.messages");
     }
 
     public int getKeyLength() {
         return keyLength;
     }
 
     public void setKeyLength(int keyLength) {
         this.keyLength = keyLength;
     }
 
     public boolean isGenerateKeys() {
         return generateKeys;
     }
 
     public void setGenerateKeys(boolean generateKeys) {
         this.generateKeys = generateKeys;
     }
 
     public boolean isSuccess() {
         return success;
     }
 
     public void setSuccess(boolean success) {
         this.success = success;
     }
 
 }