specific/OpenFileService.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.eclipse.ui.specific;
  17
  18 import java.io.File;
  19 import java.io.IOException;
  20
  21 import javax.servlet.ServletException;
  22 import javax.servlet.http.HttpServletRequest;
  23 import javax.servlet.http.HttpServletResponse;
  24
  25 import org.apache.commons.io.FileUtils;
  26 import org.argeo.ArgeoException;
  27 import org.eclipse.rap.rwt.service.ServiceHandler;
  28
  29 /**
  30  * Basic Default service handler that retrieves a file on the server file system
  31  * using its absolute path and forwards it to the end user browser. Rap
  32  * specific.
  33  *
  34  * Clients might extend to provide context specific services (to open files from
  35  * a JCR repository for instance)
  36  */
  37 public class OpenFileService implements ServiceHandler {
  38         public final static String PARAM_FILE_NAME = "param.fileName";
  39         public final static String PARAM_FILE_URI = "param.fileURI";
  40
  41         public final static String SCHEME_HOST_SEPARATOR = "://";
  42         public final static String FILE_SCHEME = "file";
  43
  44         public OpenFileService() {
  45         }
  46
  47         public void service(HttpServletRequest request, HttpServletResponse response)
  48                         throws IOException, ServletException {
  49                 String fileName = request.getParameter(PARAM_FILE_NAME);
  50                 String uri = request.getParameter(PARAM_FILE_URI);
  51
  52                 // Set the Metadata
  53                 response.setContentType("application/octet-stream");
  54                 response.setContentLength((int) getFileLength(uri));
  55                 if (fileName == null || "".equals(fileName.trim()))
  56                         fileName = getFileName(uri);
  57                 String contentDisposition = "attachment; filename=\"" + fileName + "\"";
  58                 response.setHeader("Content-Disposition", contentDisposition);
  59
  60                 response.getOutputStream().write(getFileAsByteArray(uri));
  61                 // FileUtils.readFileToByteArray(new File(path))
  62         }
  63
  64         protected byte[] getFileAsByteArray(String uri) {
  65                 if (uri.startsWith(FILE_SCHEME)) {
  66                         try {
  67                                 return FileUtils.readFileToByteArray(new File(
  68                                                 getFilePathFromUri(uri)));
  69                         } catch (IOException ioe) {
  70                                 throw new ArgeoException("Error while getting the file at "
  71                                                 + uri, ioe);
  72                         }
  73                 }
  74                 return null;
  75         }
  76
  77         protected long getFileLength(String uri) {
  78                 if (uri.startsWith(FILE_SCHEME)) {
  79                         return new File(getFilePathFromUri(uri)).length();
  80                 }
  81                 return -1l;
  82         }
  83
  84         protected String getFileName(String uri) {
  85                 if (uri.startsWith(FILE_SCHEME)) {
  86                         return new File(getFilePathFromUri(uri)).getName();
  87                 }
  88                 return null;
  89         }
  90
  91         private String getFilePathFromUri(String uri) {
  92                 return uri.substring((FILE_SCHEME + SCHEME_HOST_SEPARATOR).length());
  93         }
  94
  95 }