org.argeo.server.jcr/src/org/argeo/jcr/proxy/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.proxy;
  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
  38 /** Wraps a proxy via HTTP */
  39 public class ResourceProxyServlet extends HttpServlet {
  40         private static final long serialVersionUID = -8886549549223155801L;
  41
  42         private final static Log log = LogFactory
  43                         .getLog(ResourceProxyServlet.class);
  44
  45         private ResourceProxy proxy;
  46
  47         private String contentTypeCharset = "UTF-8";
  48
  49         @Override
  50         protected void doGet(HttpServletRequest request,
  51                         HttpServletResponse response) throws ServletException, IOException {
  52                 String path = request.getPathInfo();
  53
  54                 if (log.isTraceEnabled()) {
  55                         log.trace("path=" + path);
  56                         log.trace("UserPrincipal = " + request.getUserPrincipal().getName());
  57                         log.trace("SessionID = " + request.getSession().getId());
  58                         log.trace("ContextPath = " + request.getContextPath());
  59                         log.trace("ServletPath = " + request.getServletPath());
  60                         log.trace("PathInfo = " + request.getPathInfo());
  61                         log.trace("Method = " + request.getMethod());
  62                         log.trace("User-Agent = " + request.getHeader("User-Agent"));
  63                 }
  64
  65                 Node node = null;
  66                 try {
  67                         node = proxy.proxy(path);
  68                         if (node == null)
  69                                 response.sendError(404);
  70                         else
  71                                 processResponse(node, response);
  72                 } finally {
  73                         if (node != null)
  74                                 try {
  75                                         JcrUtils.logoutQuietly(node.getSession());
  76                                 } catch (RepositoryException e) {
  77                                         // silent
  78                                 }
  79                 }
  80
  81         }
  82
  83         /** Retrieve the content of the node. */
  84         protected void processResponse(Node node, HttpServletResponse response) {
  85                 Binary binary = null;
  86                 InputStream in = null;
  87                 try {
  88                         String fileName = node.getName();
  89                         String ext = FilenameUtils.getExtension(fileName);
  90
  91                         // TODO use a more generic / standard approach
  92                         // see http://svn.apache.org/viewvc/tomcat/trunk/conf/web.xml
  93                         String contentType;
  94                         if ("xml".equals(ext))
  95                                 contentType = "text/xml;charset=" + contentTypeCharset;
  96                         else if ("jar".equals(ext))
  97                                 contentType = "application/java-archive";
  98                         else if ("zip".equals(ext))
  99                                 contentType = "application/zip";
 100                         else if ("gz".equals(ext))
 101                                 contentType = "application/x-gzip";
 102                         else if ("bz2".equals(ext))
 103                                 contentType = "application/x-bzip2";
 104                         else if ("tar".equals(ext))
 105                                 contentType = "application/x-tar";
 106                         else if ("rpm".equals(ext))
 107                                 contentType = "application/x-redhat-package-manager";
 108                         else
 109                                 contentType = "application/octet-stream";
 110                         contentType = contentType + ";name=\"" + fileName + "\"";
 111                         response.setHeader("Content-Disposition", "attachment; filename=\""
 112                                         + fileName + "\"");
 113                         response.setHeader("Expires", "0");
 114                         response.setHeader("Cache-Control", "no-cache, must-revalidate");
 115                         response.setHeader("Pragma", "no-cache");
 116
 117                         response.setContentType(contentType);
 118
 119                         try {
 120                                 binary = node.getNode(Property.JCR_CONTENT)
 121                                                 .getProperty(Property.JCR_DATA).getBinary();
 122                         } catch (PathNotFoundException e) {
 123                                 log.error("Node " + node + " as no data under content");
 124                                 throw e;
 125                         }
 126                         in = binary.getStream();
 127                         IOUtils.copy(in, response.getOutputStream());
 128                 } catch (Exception e) {
 129                         throw new ArgeoException("Cannot download " + node, e);
 130                 } finally {
 131                         IOUtils.closeQuietly(in);
 132                         JcrUtils.closeQuietly(binary);
 133                 }
 134         }
 135
 136         public void setProxy(ResourceProxy resourceProxy) {
 137                 this.proxy = resourceProxy;
 138         }
 139
 140 }