runtime/org.argeo.slc.support.simple/src/main/java/org/argeo/slc/jsch/ScpFrom.java

   1 /*
   2  * Copyright (C) 2010 Mathieu Baudier <mbaudier@argeo.org>
   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
  17 package org.argeo.slc.jsch;
  18
  19 import java.io.File;
  20 import java.io.FileOutputStream;
  21 import java.io.IOException;
  22 import java.io.InputStream;
  23 import java.io.OutputStream;
  24
  25 import org.apache.commons.io.IOUtils;
  26 import org.apache.commons.logging.Log;
  27 import org.apache.commons.logging.LogFactory;
  28 import org.argeo.slc.SlcException;
  29 import org.springframework.core.io.Resource;
  30
  31 import com.jcraft.jsch.Channel;
  32 import com.jcraft.jsch.ChannelExec;
  33 import com.jcraft.jsch.Session;
  34
  35 public class ScpFrom extends AbstractJschTask {
  36         private final static Log log = LogFactory.getLog(ScpFrom.class);
  37
  38         private Resource localResource;
  39         private String remotePath;
  40         private Boolean mkdir = false;
  41
  42         public void run(Session session) {
  43                 if (localResource != null) {
  44                         File lFile;
  45                         try {
  46                                 lFile = localResource.getFile();
  47                         } catch (IOException e) {
  48                                 throw new SlcException("Cannot interpret resource "
  49                                                 + localResource + " as file.", e);
  50                         }
  51                         downloadFile(session, lFile, remotePath);
  52                 }
  53         }
  54
  55         protected void downloadFile(Session session, File localFile,
  56                         String remoteFile) {
  57                 OutputStream out = null;
  58                 OutputStream channelOut;
  59                 InputStream channelIn;
  60                 try {
  61                         // exec 'scp -f rfile' remotely
  62                         String command = "scp -f " + remoteFile;
  63                         Channel channel = session.openChannel("exec");
  64                         ((ChannelExec) channel).setCommand(command);
  65
  66                         // get I/O streams for remote scp
  67                         channelOut = channel.getOutputStream();
  68                         channelIn = channel.getInputStream();
  69
  70                         channel.connect();
  71
  72                         byte[] buf = new byte[1024];
  73
  74                         // send '\0'
  75                         buf[0] = 0;
  76                         channelOut.write(buf, 0, 1);
  77                         channelOut.flush();
  78
  79                         while (true) {
  80                                 int c = checkAck(channelIn);
  81                                 if (c != 'C') {
  82                                         break;
  83                                 }
  84
  85                                 // read '0644 '
  86                                 channelIn.read(buf, 0, 5);
  87
  88                                 long filesize = 0L;
  89                                 while (true) {
  90                                         if (channelIn.read(buf, 0, 1) < 0) {
  91                                                 // error
  92                                                 break;
  93                                         }
  94                                         if (buf[0] == ' ')
  95                                                 break;
  96                                         filesize = filesize * 10L + (long) (buf[0] - '0');
  97                                 }
  98
  99                                 String remoteFileName = null;
 100                                 for (int i = 0;; i++) {
 101                                         channelIn.read(buf, i, 1);
 102                                         if (buf[i] == (byte) 0x0a) {
 103                                                 remoteFileName = new String(buf, 0, i);
 104                                                 break;
 105                                         }
 106                                 }
 107
 108                                 // System.out.println("filesize="+filesize+", file="+file);
 109
 110                                 // send '\0'
 111                                 buf[0] = 0;
 112                                 channelOut.write(buf, 0, 1);
 113                                 channelOut.flush();
 114
 115                                 // Create a s adirectory if it doesn't exists
 116                                 if (!localFile.exists() && mkdir)
 117                                         localFile.mkdirs();
 118
 119                                 // read a content of lfile
 120                                 String localPath = localFile.isDirectory() ? localFile
 121                                                 .getPath()
 122                                                 + File.separator + remoteFileName : localFile.getPath();
 123
 124                                 out = new FileOutputStream(localPath);
 125                                 int foo;
 126                                 while (true) {
 127                                         if (buf.length < filesize)
 128                                                 foo = buf.length;
 129                                         else
 130                                                 foo = (int) filesize;
 131                                         foo = channelIn.read(buf, 0, foo);
 132                                         if (foo < 0) {
 133                                                 // error
 134                                                 break;
 135                                         }
 136                                         out.write(buf, 0, foo);
 137                                         filesize -= foo;
 138                                         if (filesize == 0L)
 139                                                 break;
 140                                 }
 141
 142                                 checkAck(channelIn);
 143
 144                                 // send '\0'
 145                                 buf[0] = 0;
 146                                 channelOut.write(buf, 0, 1);
 147                                 channelOut.flush();
 148
 149                                 if (log.isDebugEnabled())
 150                                         log.debug("Finished downloading " + remoteFile + " on "
 151                                                         + getSshTarget() + " to " + localPath);
 152                         }
 153
 154                         channel.disconnect();
 155                         // session.disconnect();
 156                 } catch (Exception e) {
 157                         throw new SlcException("Cannot download " + remoteFile + " to "
 158                                         + localFile, e);
 159                 } finally {
 160                         IOUtils.closeQuietly(out);
 161                 }
 162         }
 163
 164         public void setLocalResource(Resource localFile) {
 165                 this.localResource = localFile;
 166         }
 167
 168         public void setRemotePath(String remoteFile) {
 169                 this.remotePath = remoteFile;
 170         }
 171
 172         public void setMkdir(Boolean mkdir) {
 173                 this.mkdir = mkdir;
 174         }
 175 }