View Javadoc
1   /*
2    * Copyright (c) 2002-2020, City of Paris
3    * All rights reserved.
4    *
5    * Redistribution and use in source and binary forms, with or without
6    * modification, are permitted provided that the following conditions
7    * are met:
8    *
9    *  1. Redistributions of source code must retain the above copyright notice
10   *     and the following disclaimer.
11   *
12   *  2. Redistributions in binary form must reproduce the above copyright notice
13   *     and the following disclaimer in the documentation and/or other materials
14   *     provided with the distribution.
15   *
16   *  3. Neither the name of 'Mairie de Paris' nor 'Lutece' nor the names of its
17   *     contributors may be used to endorse or promote products derived from
18   *     this software without specific prior written permission.
19   *
20   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
21   * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23   * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE
24   * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
25   * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
26   * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
27   * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
28   * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
29   * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
30   * POSSIBILITY OF SUCH DAMAGE.
31   *
32   * License 1.0
33   */
34  package fr.paris.lutece.plugins.blog.web;
35  
36  import fr.paris.lutece.plugins.blog.business.DocContent;
37  import fr.paris.lutece.plugins.blog.business.DocContentHome;
38  import fr.paris.lutece.portal.service.util.AppLogService;
39  import fr.paris.lutece.portal.service.util.AppPropertiesService;
40  
41  import org.apache.commons.lang.StringUtils;
42  
43  import java.io.IOException;
44  import java.io.OutputStream;
45  
46  import javax.servlet.ServletException;
47  import javax.servlet.http.HttpServlet;
48  import javax.servlet.http.HttpServletRequest;
49  import javax.servlet.http.HttpServletResponse;
50  
51  /**
52   * Servlet serving ticketing files
53   */
54  public class BlogFileServlet extends HttpServlet
55  {
56      /**
57       * Generated serial Id
58       */
59      private static final long serialVersionUID = -3589685443968252550L;
60  
61      // Parameters
62      public static final String PARAMETER_ID_FILE = "id_file";
63  
64      // Other constants
65      public static final String URL_SERVLET = "servlet/plugins/blog/file";
66      private static final String LOG_UNKNOWN_ID_RESPONSE = "Calling Blogd file servlet with unknown id file : ";
67      private static final String LOG_WRONG_ID_RESPONSE = "Calling Blogd file servlet with wrong format for parameter " + PARAMETER_ID_FILE + " : ";
68      private static final String PROPERTY_MAX_AGE = "blog.fileServlet.maxAge";
69      private static final long DEFAULT_MAX_AGE = 60L * 60 * 24 * 7; // 1 week
70      private static final long MAX_AGE = AppPropertiesService.getPropertyLong( PROPERTY_MAX_AGE, DEFAULT_MAX_AGE );
71  
72      /**
73       * Processes requests for both HTTP <code>GET</code> and <code>POST</code> methods.
74       * 
75       * @param request
76       *            servlet request
77       * @param httpResponse
78       *            servlet response
79       * @throws ServletException
80       *             the servlet Exception
81       * @throws IOException
82       *             the io exception
83       */
84      protected void processRequest( HttpServletRequest request, HttpServletResponse httpResponse ) throws ServletException, IOException
85      {
86          String strIdFile = request.getParameter( PARAMETER_ID_FILE );
87          if ( !StringUtils.isEmpty( strIdFile ) && StringUtils.isNumeric( strIdFile ) )
88          {
89              int nIdResponse = Integer.parseInt( strIdFile );
90  
91              DocContent docContent = DocContentHome.getDocsContent( nIdResponse );
92  
93              if ( docContent == null )
94              {
95                  AppLogService.error( LOG_UNKNOWN_ID_RESPONSE + strIdFile );
96                  throw new ServletException( LOG_UNKNOWN_ID_RESPONSE + strIdFile );
97              }
98  
99              httpResponse.setHeader( "Content-Disposition", "attachment; filename=\"" + docContent.getTextValue( ) + "\";" );
100             httpResponse.setHeader( "Content-type", docContent.getValueContentType( ) );
101             httpResponse.addHeader( "Content-Encoding", "UTF-8" );
102             httpResponse.addHeader( "Cache-Control", "public,max-age=" + MAX_AGE );
103 
104             try ( OutputStream os = httpResponse.getOutputStream( ) )
105             {
106                 os.write( docContent.getBinaryValue( ) );
107                 // We do not close the output stream in finaly clause because it is
108                 // the response stream,
109                 // and an error message needs to be displayed if an exception occurs
110             }
111             catch( IOException e )
112             {
113                 AppLogService.error( e.getStackTrace( ), e );
114             }
115         }
116         else
117         {
118             AppLogService.error( LOG_WRONG_ID_RESPONSE + strIdFile );
119             throw new ServletException( );
120         }
121     }
122 
123     /**
124      * Handles the HTTP <code>GET</code> method.
125      * 
126      * @param request
127      *            servlet request
128      * @param response
129      *            servlet response
130      * @throws ServletException
131      *             the servlet Exception
132      * @throws IOException
133      *             the io exception
134      */
135     @Override
136     protected void doGet( HttpServletRequest request, HttpServletResponse response ) throws ServletException, IOException
137     {
138         processRequest( request, response );
139     }
140 
141     /**
142      * Handles the HTTP <code>POST</code> method.
143      * 
144      * @param request
145      *            servlet request
146      * @param response
147      *            servlet response
148      * @throws ServletException
149      *             the servlet Exception
150      * @throws IOException
151      *             the io exception
152      */
153     @Override
154     protected void doPost( HttpServletRequest request, HttpServletResponse response ) throws ServletException, IOException
155     {
156         processRequest( request, response );
157     }
158 
159     /**
160      * Returns a short description of the servlet.
161      * 
162      * @return message
163      */
164     @Override
165     public String getServletInfo( )
166     {
167         return "Servlet serving file content";
168     }
169 
170 }