org.argeo.server.jcr.mvc/src/org/argeo/jcr/mvc/ResourceProxyServlet.java

   1 /*
   2  * Copyright (C) 2007-2012 Argeo GmbH
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  *         http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16 package org.argeo.jcr.mvc;
  17
  18 import java.io.IOException;
  19 import java.io.InputStream;
  20
  21 import javax.jcr.Binary;
  22 import javax.jcr.Node;
  23 import javax.jcr.PathNotFoundException;
  24 import javax.jcr.Property;
  25 import javax.jcr.RepositoryException;
  26 import javax.servlet.ServletException;
  27 import javax.servlet.http.HttpServlet;
  28 import javax.servlet.http.HttpServletRequest;
  29 import javax.servlet.http.HttpServletResponse;
  30
  31 import org.apache.commons.io.FilenameUtils;
  32 import org.apache.commons.io.IOUtils;
  33 import org.apache.commons.logging.Log;
  34 import org.apache.commons.logging.LogFactory;
  35 import org.argeo.ArgeoException;
  36 import org.argeo.jcr.JcrUtils;
  37 import org.argeo.jcr.proxy.ResourceProxy;
  38
  39 /** Wraps a proxy via HTTP */
  40 public class ResourceProxyServlet extends HttpServlet {
  41         private static final long serialVersionUID = -8886549549223155801L;
  42
  43         private final static Log log = LogFactory
  44                         .getLog(ResourceProxyServlet.class);
  45
  46         private ResourceProxy proxy;
  47
  48         private String contentTypeCharset = "UTF-8";
  49
  50         @Override
  51         protected void doGet(HttpServletRequest request,
  52                         HttpServletResponse response) throws ServletException, IOException {
  53                 String path = request.getPathInfo();
  54
  55                 if (log.isTraceEnabled()) {
  56                         log.trace("path=" + path);
  57                         log.trace("UserPrincipal = " + request.getUserPrincipal().getName());
  58                         log.trace("SessionID = " + request.getSession().getId());
  59                         log.trace("ContextPath = " + request.getContextPath());
  60                         log.trace("ServletPath = " + request.getServletPath());
  61                         log.trace("PathInfo = " + request.getPathInfo());
  62                         log.trace("Method = " + request.getMethod());
  63                         log.trace("User-Agent = " + request.getHeader("User-Agent"));
  64                 }
  65
  66                 Node node = null;
  67                 try {
  68                         node = proxy.proxy(path);
  69                         if (node == null)
  70                                 response.sendError(404);
  71                         else
  72                                 processResponse(node, response);
  73                 } finally {
  74                         if (node != null)
  75                                 try {
  76                                         JcrUtils.logoutQuietly(node.getSession());
  77                                 } catch (RepositoryException e) {
  78                                         // silent
  79                                 }
  80                 }
  81
  82         }
  83
  84         /** Retrieve the content of the node. */
  85         protected void processResponse(Node node, HttpServletResponse response) {
  86                 Binary binary = null;
  87                 InputStream in = null;
  88                 try {
  89                         String fileName = node.getName();
  90                         String ext = FilenameUtils.getExtension(fileName);
  91
  92                         // TODO use a more generic / standard approach
  93                         // see http://svn.apache.org/viewvc/tomcat/trunk/conf/web.xml
  94                         String contentType;
  95                         if ("xml".equals(ext))
  96                                 contentType = "text/xml;charset=" + contentTypeCharset;
  97                         else if ("jar".equals(ext))
  98                                 contentType = "application/java-archive";
  99                         else if ("zip".equals(ext))
 100                                 contentType = "application/zip";
 101                         else if ("gz".equals(ext))
 102                                 contentType = "application/x-gzip";
 103                         else if ("bz2".equals(ext))
 104                                 contentType = "application/x-bzip2";
 105                         else if ("tar".equals(ext))
 106                                 contentType = "application/x-tar";
 107                         else if ("rpm".equals(ext))
 108                                 contentType = "application/x-redhat-package-manager";
 109                         else
 110                                 contentType = "application/octet-stream";
 111                         contentType = contentType + ";name=\"" + fileName + "\"";
 112                         response.setHeader("Content-Disposition", "attachment; filename=\""
 113                                         + fileName + "\"");
 114                         response.setHeader("Expires", "0");
 115                         response.setHeader("Cache-Control", "no-cache, must-revalidate");
 116                         response.setHeader("Pragma", "no-cache");
 117
 118                         response.setContentType(contentType);
 119
 120                         try {
 121                                 binary = node.getNode(Property.JCR_CONTENT)
 122                                                 .getProperty(Property.JCR_DATA).getBinary();
 123                         } catch (PathNotFoundException e) {
 124                                 log.error("Node " + node + " as no data under content");
 125                                 throw e;
 126                         }
 127                         in = binary.getStream();
 128                         IOUtils.copy(in, response.getOutputStream());
 129                 } catch (Exception e) {
 130                         throw new ArgeoException("Cannot download " + node, e);
 131                 } finally {
 132                         IOUtils.closeQuietly(in);
 133                         JcrUtils.closeQuietly(binary);
 134                 }
 135         }
 136
 137         public void setProxy(ResourceProxy resourceProxy) {
 138                 this.proxy = resourceProxy;
 139         }
 140
 141 }