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

   1 package org.argeo.slc.jsch;
   2
   3 import java.io.File;
   4 import java.io.FileOutputStream;
   5 import java.io.IOException;
   6 import java.io.InputStream;
   7 import java.io.OutputStream;
   8
   9 import org.apache.commons.io.IOUtils;
  10 import org.apache.commons.logging.Log;
  11 import org.apache.commons.logging.LogFactory;
  12 import org.argeo.slc.SlcException;
  13 import org.springframework.core.io.Resource;
  14
  15 import com.jcraft.jsch.Channel;
  16 import com.jcraft.jsch.ChannelExec;
  17 import com.jcraft.jsch.Session;
  18
  19 public class ScpFrom extends AbstractJschTask {
  20         private final static Log log = LogFactory.getLog(ScpFrom.class);
  21
  22         private Resource localResource;
  23         private String remotePath;
  24         private Boolean mkdir = false;
  25
  26         public void run(Session session) {
  27                 if (localResource != null) {
  28                         File lFile;
  29                         try {
  30                                 lFile = localResource.getFile();
  31                         } catch (IOException e) {
  32                                 throw new SlcException("Cannot interpret resource "
  33                                                 + localResource + " as file.", e);
  34                         }
  35                         downloadFile(session, lFile, remotePath);
  36                 }
  37         }
  38
  39         protected void downloadFile(Session session, File localFile,
  40                         String remoteFile) {
  41                 OutputStream out = null;
  42                 OutputStream channelOut;
  43                 InputStream channelIn;
  44                 try {
  45                         // exec 'scp -f rfile' remotely
  46                         String command = "scp -f " + remoteFile;
  47                         Channel channel = session.openChannel("exec");
  48                         ((ChannelExec) channel).setCommand(command);
  49
  50                         // get I/O streams for remote scp
  51                         channelOut = channel.getOutputStream();
  52                         channelIn = channel.getInputStream();
  53
  54                         channel.connect();
  55
  56                         byte[] buf = new byte[1024];
  57
  58                         // send '\0'
  59                         buf[0] = 0;
  60                         channelOut.write(buf, 0, 1);
  61                         channelOut.flush();
  62
  63                         while (true) {
  64                                 int c = checkAck(channelIn);
  65                                 if (c != 'C') {
  66                                         break;
  67                                 }
  68
  69                                 // read '0644 '
  70                                 channelIn.read(buf, 0, 5);
  71
  72                                 long filesize = 0L;
  73                                 while (true) {
  74                                         if (channelIn.read(buf, 0, 1) < 0) {
  75                                                 // error
  76                                                 break;
  77                                         }
  78                                         if (buf[0] == ' ')
  79                                                 break;
  80                                         filesize = filesize * 10L + (long) (buf[0] - '0');
  81                                 }
  82
  83                                 String remoteFileName = null;
  84                                 for (int i = 0;; i++) {
  85                                         channelIn.read(buf, i, 1);
  86                                         if (buf[i] == (byte) 0x0a) {
  87                                                 remoteFileName = new String(buf, 0, i);
  88                                                 break;
  89                                         }
  90                                 }
  91
  92                                 // System.out.println("filesize="+filesize+", file="+file);
  93
  94                                 // send '\0'
  95                                 buf[0] = 0;
  96                                 channelOut.write(buf, 0, 1);
  97                                 channelOut.flush();
  98
  99                                 // Create a s adirectory if it doesn't exists
 100                                 if (!localFile.exists() && mkdir)
 101                                         localFile.mkdirs();
 102
 103                                 // read a content of lfile
 104                                 String localPath = localFile.isDirectory() ? localFile
 105                                                 .getPath()
 106                                                 + File.separator + remoteFileName : localFile.getPath();
 107                                 if (log.isDebugEnabled())
 108                                         log.debug("Download " + remoteFile + " to " + localPath);
 109
 110                                 out = new FileOutputStream(localPath);
 111                                 int foo;
 112                                 while (true) {
 113                                         if (buf.length < filesize)
 114                                                 foo = buf.length;
 115                                         else
 116                                                 foo = (int) filesize;
 117                                         foo = channelIn.read(buf, 0, foo);
 118                                         if (foo < 0) {
 119                                                 // error
 120                                                 break;
 121                                         }
 122                                         out.write(buf, 0, foo);
 123                                         filesize -= foo;
 124                                         if (filesize == 0L)
 125                                                 break;
 126                                 }
 127
 128                                 checkAck(channelIn);
 129
 130                                 // send '\0'
 131                                 buf[0] = 0;
 132                                 channelOut.write(buf, 0, 1);
 133                                 channelOut.flush();
 134                         }
 135
 136                         channel.disconnect();
 137                         // session.disconnect();
 138                 } catch (Exception e) {
 139                         throw new SlcException("Cannot download " + remoteFile + " to "
 140                                         + localFile, e);
 141                 } finally {
 142                         IOUtils.closeQuietly(out);
 143                 }
 144         }
 145
 146         public void setLocalResource(Resource localFile) {
 147                 this.localResource = localFile;
 148         }
 149
 150         public void setRemotePath(String remoteFile) {
 151                 this.remotePath = remoteFile;
 152         }
 153
 154         public void setMkdir(Boolean mkdir) {
 155                 this.mkdir = mkdir;
 156         }
 157 }