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