org.argeo.slc.support/src/org/argeo/slc/jsch/ScpFrom.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.slc.jsch;
  17
  18 import java.io.File;
  19 import java.io.FileOutputStream;
  20 import java.io.IOException;
  21 import java.io.InputStream;
  22 import java.io.OutputStream;
  23
  24 import org.apache.commons.io.IOUtils;
  25 import org.apache.commons.logging.Log;
  26 import org.apache.commons.logging.LogFactory;
  27 import org.argeo.slc.SlcException;
  28 import org.springframework.core.io.Resource;
  29
  30 import com.jcraft.jsch.Channel;
  31 import com.jcraft.jsch.ChannelExec;
  32 import com.jcraft.jsch.Session;
  33
  34 public class ScpFrom extends AbstractJschTask {
  35         private final static Log log = LogFactory.getLog(ScpFrom.class);
  36
  37         private Resource localResource;
  38         private String remotePath;
  39         private Boolean mkdir = false;
  40
  41         public void run(Session session) {
  42                 if (localResource != null) {
  43                         File lFile;
  44                         try {
  45                                 lFile = localResource.getFile();
  46                         } catch (IOException e) {
  47                                 throw new SlcException("Cannot interpret resource "
  48                                                 + localResource + " as file.", e);
  49                         }
  50                         downloadFile(session, lFile, remotePath);
  51                 }
  52         }
  53
  54         protected void downloadFile(Session session, File localFile,
  55                         String remoteFile) {
  56                 OutputStream out = null;
  57                 OutputStream channelOut;
  58                 InputStream channelIn;
  59                 try {
  60                         // exec 'scp -f rfile' remotely
  61                         String command = "scp -f " + remoteFile;
  62                         Channel channel = session.openChannel("exec");
  63                         ((ChannelExec) channel).setCommand(command);
  64
  65                         // get I/O streams for remote scp
  66                         channelOut = channel.getOutputStream();
  67                         channelIn = channel.getInputStream();
  68
  69                         channel.connect();
  70
  71                         byte[] buf = new byte[1024];
  72
  73                         // send '\0'
  74                         buf[0] = 0;
  75                         channelOut.write(buf, 0, 1);
  76                         channelOut.flush();
  77
  78                         while (true) {
  79                                 int c = checkAck(channelIn);
  80                                 if (c != 'C') {
  81                                         break;
  82                                 }
  83
  84                                 // read '0644 '
  85                                 channelIn.read(buf, 0, 5);
  86
  87                                 long filesize = 0L;
  88                                 while (true) {
  89                                         if (channelIn.read(buf, 0, 1) < 0) {
  90                                                 // error
  91                                                 break;
  92                                         }
  93                                         if (buf[0] == ' ')
  94                                                 break;
  95                                         filesize = filesize * 10L + (long) (buf[0] - '0');
  96                                 }
  97
  98                                 String remoteFileName = null;
  99                                 for (int i = 0;; i++) {
 100                                         channelIn.read(buf, i, 1);
 101                                         if (buf[i] == (byte) 0x0a) {
 102                                                 remoteFileName = new String(buf, 0, i);
 103                                                 break;
 104                                         }
 105                                 }
 106
 107                                 // System.out.println("filesize="+filesize+", file="+file);
 108
 109                                 // send '\0'
 110                                 buf[0] = 0;
 111                                 channelOut.write(buf, 0, 1);
 112                                 channelOut.flush();
 113
 114                                 // Create a s adirectory if it doesn't exists
 115                                 if (!localFile.exists() && mkdir)
 116                                         localFile.mkdirs();
 117
 118                                 // read a content of lfile
 119                                 String localPath = localFile.isDirectory() ? localFile
 120                                                 .getPath()
 121                                                 + File.separator + remoteFileName : localFile.getPath();
 122
 123                                 out = new FileOutputStream(localPath);
 124                                 int foo;
 125                                 while (true) {
 126                                         if (buf.length < filesize)
 127                                                 foo = buf.length;
 128                                         else
 129                                                 foo = (int) filesize;
 130                                         foo = channelIn.read(buf, 0, foo);
 131                                         if (foo < 0) {
 132                                                 // error
 133                                                 break;
 134                                         }
 135                                         out.write(buf, 0, foo);
 136                                         filesize -= foo;
 137                                         if (filesize == 0L)
 138                                                 break;
 139                                 }
 140
 141                                 checkAck(channelIn);
 142
 143                                 // send '\0'
 144                                 buf[0] = 0;
 145                                 channelOut.write(buf, 0, 1);
 146                                 channelOut.flush();
 147
 148                                 if (log.isDebugEnabled())
 149                                         log.debug("Finished downloading " + remoteFile + " on "
 150                                                         + getSshTarget() + " to " + localPath);
 151                         }
 152
 153                         channel.disconnect();
 154                         // session.disconnect();
 155                 } catch (Exception e) {
 156                         throw new SlcException("Cannot download " + remoteFile + " to "
 157                                         + localFile, e);
 158                 } finally {
 159                         IOUtils.closeQuietly(out);
 160                 }
 161         }
 162
 163         public void setLocalResource(Resource localFile) {
 164                 this.localResource = localFile;
 165         }
 166
 167         public void setRemotePath(String remoteFile) {
 168                 this.remotePath = remoteFile;
 169         }
 170
 171         public void setMkdir(Boolean mkdir) {
 172                 this.mkdir = mkdir;
 173         }
 174 }