/**
    * This file Copyright (c) 2003-2014 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.admininterface.pages;
  
  import info.magnolia.cms.beans.config.ContentRepository;
  import info.magnolia.cms.core.HierarchyManager;
  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.Permission;
  import info.magnolia.cms.util.AlertUtil;
  import info.magnolia.context.MgnlContext;
  import info.magnolia.importexport.DataTransporter;
  import info.magnolia.module.admininterface.TemplatedMVCHandler;
  import info.magnolia.repository.RepositoryConstants;
  
  import java.io.IOException;
  import java.io.OutputStream;
  import java.util.Iterator;
  
  import javax.jcr.LoginException;
  import javax.jcr.PathNotFoundException;
  import javax.jcr.RepositoryException;
  import javax.jcr.Session;
  import javax.jcr.Workspace;
  import javax.servlet.ServletException;
  import javax.servlet.http.HttpServletRequest;
  import javax.servlet.http.HttpServletResponse;
  
  import org.apache.commons.lang.StringEscapeUtils;
  import org.apache.commons.lang.StringUtils;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  
  /**
   * Simple servlet used to import/export data from jcr using the standard jcr import/export features.
   * @author Fabrizio Giustina
   * @version $Id$
   */
  public class ExportPage extends TemplatedMVCHandler {
  
      /**
       * Stable serialVersionUID.
       */
      public static final long serialVersionUID = 222L;
  
      public static final String MIME_TEXT_XML = "text/xml";
  
      public static final String MIME_GZIP = "application/x-gzip";
  
      public static final String MIME_APPLICATION_ZIP = "application/zip";
  
      /**
       * View value for the export file stream (won't render anything)
       */
      public static final String VIEW_EXPORT="export";
  
      /**
       * Logger.
       */
      private static Logger log = LoggerFactory.getLogger(ExportPage.class);
  
      protected String mgnlRepository;
  
      protected String mgnlPath;
  
     private boolean mgnlFormat;
 
     private String ext;
 
     private boolean exportxml;
 
     /**
      * Getter for <code>ext</code>.
      * @return Returns the ext.
      */
     public String getExt() {
         return this.ext;
     }
 
     /**
      * Setter for <code>ext</code>.
      * @param ext The ext to set.
      */
     public void setExt(String ext) {
         this.ext = ext;
     }
 
     /**
      * Getter for <code>mgnlFormat</code>.
      * @return Returns the mgnlFormat.
      */
     public boolean isMgnlFormat() {
         return this.mgnlFormat;
     }
 
     /**
      * Setter for <code>mgnlFormat</code>.
      * @param mgnlFormat The mgnlFormat to set.
      */
     public void setMgnlFormat(boolean mgnlFormat) {
         this.mgnlFormat = mgnlFormat;
     }
 
     /**
      * Getter for <code>mgnlPath</code>.
      * @return Returns the mgnlPath.
      */
     public String getMgnlPath() {
         return this.mgnlPath;
     }
 
     /**
      * Setter for <code>mgnlPath</code>.
      * @param mgnlPath The mgnlPath to set.
      */
     public void setMgnlPath(String mgnlPath) {
         this.mgnlPath = mgnlPath;
     }
 
     /**
      * Getter for <code>mgnlRepository</code>.
      * @return Returns the mgnlRepository.
      */
     public String getMgnlRepository() {
         return this.mgnlRepository;
     }
 
     /**
      * Setter for <code>mgnlRepository</code>.
      * @param mgnlRepository The mgnlRepository to set.
      */
     public void setMgnlRepository(String mgnlRepository) {
         this.mgnlRepository = mgnlRepository;
     }
 
     /**
      * Getter for <code>exportxml</code>.
      * @return Returns the exportxml.
      */
     public boolean isExportxml() {
         return this.exportxml;
     }
 
     /**
      * Setter for <code>exportxml</code>.
      * @param exportxml The exportxml to set.
      */
     public void setExportxml(boolean exportxml) {
         this.exportxml = exportxml;
     }
 
     /**
      * @param name
      * @param request
      * @param response
      */
     public ExportPage(String name, HttpServletRequest request, HttpServletResponse response) {
         super(name, request, response);
     }
 
     /**
      * @see info.magnolia.cms.servlets.MVCServletHandlerImpl#getCommand()
      */
     @Override
     public String getCommand() {
         if (this.exportxml) {
             return "exportxml";
         }
         return super.getCommand();
     }
 
     /**
      * Actually perform export. The generated file is sent to the client.
      * @param response HttpServletResponse
      * @param repository selected repository
      * @param basepath base path in repository
      * @param format should we format the resulting xml
      * @param keepVersionHistory if <code>false</code> version info will be stripped from the exported document
      * @throws IOException for errors while accessing the servlet output stream
      */
     public String exportxml() throws Exception {
 
         if (StringUtils.isEmpty(mgnlRepository)) {
             mgnlRepository = RepositoryConstants.WEBSITE;
         }
         if (StringUtils.isEmpty(mgnlPath)) {
             mgnlPath = "/";
         }
         if (StringUtils.isEmpty(ext)) {
             ext = DataTransporter.XML;
         }
 
         checkPath(); //check if path exists
 
         if (!checkPermissions(request, mgnlRepository, mgnlPath, Permission.WRITE)) {
 
             AlertUtil.setMessage("User not allowed to modify own user data [" + StringEscapeUtils.escapeHtml(mgnlPath) + "].");
 
             throw new ServletException(new AccessDeniedException(
                 "User not allowed to modify own user data ["
                     + StringEscapeUtils.escapeHtml(mgnlPath) //escape to prevent XSS attack
                     + "]."));
 
         }
         HierarchyManager hr = MgnlContext.getHierarchyManager(mgnlRepository);
         Workspace ws = hr.getWorkspace();
         Session session = ws.getSession();
 
         if (ext.equalsIgnoreCase(DataTransporter.ZIP)) {
             response.setContentType(MIME_APPLICATION_ZIP);
         }
         else if (ext.equalsIgnoreCase(DataTransporter.GZ)) {
             response.setContentType(MIME_GZIP);
         }
         else {
             response.setContentType(MIME_TEXT_XML);
             response.setCharacterEncoding("UTF-8");
         }
 
         String pathName = DataTransporter.createExportPath(mgnlPath);
         pathName = DataTransporter.encodePath(pathName, DataTransporter.DOT, DataTransporter.UTF8);
         if (DataTransporter.DOT.equals(pathName)) {
             // root node
             pathName = StringUtils.EMPTY;
         }
 
         response.setHeader("content-disposition", "attachment; filename=" + mgnlRepository + pathName + ext);
         OutputStream baseOutputStream = response.getOutputStream();
 
         try {
             DataTransporter.executeExport(
                 baseOutputStream,
                 false,
                 mgnlFormat,
                 session,
                 mgnlPath,
                 mgnlRepository,
                 ext);
         }
         catch (RuntimeException e) {
             response.setContentType("text/html; charset=UTF-8");
             response.setHeader("content-disposition", "inline");
             throw e;
         }
 
         return VIEW_EXPORT;
     }
 
     /**
      * Uses access manager to authorise 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;
     }
 
     @Override
     public void renderHtml(String view) throws IOException {
         // if we are exporing the file, everything is already done --> do not render
         if(VIEW_EXPORT.equals(view)){
             return;
         }
         super.renderHtml(view);
     }
 
     public Messages getMessages() {
         return MessagesManager.getMessages();
     }
 
     public Iterator getRepositories() {
         return ContentRepository.getAllRepositoryNames();
     }
 
     protected void checkPath() throws LoginException, RepositoryException, ServletException {
         try {
             if (!MgnlContext.getJCRSession(mgnlRepository).nodeExists(mgnlPath)) {
                 String escapedMessage = "The path [" + StringEscapeUtils.escapeHtml(mgnlPath) + "] doesn't exist in the [" + mgnlRepository + "] repository."; // escape to prevent XSS attack
                 AlertUtil.setMessage(escapedMessage);
                 throw new ServletException(new PathNotFoundException(escapedMessage));
             }
         } catch (RepositoryException e) {
             String escapedMessage = StringEscapeUtils.escapeHtml(e.getMessage());
             AlertUtil.setMessage(escapedMessage);
             throw new ServletException(new RepositoryException(escapedMessage)); // escape to prevent XSS attack
         }
     }
 }