* Net-related helper objects.

* Python-based SFTP client.

net/.cvsignore

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+*.pyc
+*.pyo

net/__init__.py

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+# $Id: __init__.py,v 1.1 2010-05-28 18:42:29 wirawan Exp $
+#
+# wpylib.net module
+# Created: 20100226
+# Wirawan Purwanto
+#
+pass

net/sftp.py

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+# $Id: sftp.py,v 1.1 2010-05-28 18:42:29 wirawan Exp $
+#
+# wpylib.net.sftp_robot module
+# Created: 20100226
+# Wirawan Purwanto
+#
+"""
+SFTP-related module.
+
+A better implementation is based on paramiko secure shell library
+(http://www.lag.net/paramiko/).
+A clunky implementation is based on `sftp' program. But the status inquiry
+only works for Linux OS since it uses /proc/$PID approach.
+"""
+
+import getpass
+import os
+
+try:
+  import paramiko
+  has_paramiko = True
+except:
+  has_paramiko = False
+
+if has_paramiko:
+  class sftp_client(object):
+    """Python-controllable SFTP client.
+    It's better to have no password (i.e. using private/public key authentication)
+    to avoid additional security issues with python, password being passed around
+    in clear text."""
+    def __init__(self, hostname, username=None, port=22, password=None):
+      conn = paramiko.SSHClient()
+      if username == None:
+        username = getpass.getuser()
+  
+      self.conn = conn
+      self.username = username
+      self.hostname = hostname
+      self.port = hostname
+  
+      # Default init stage:
+      conn.load_system_host_keys()
+      #print "here1"
+      conn.load_host_keys(os.path.expanduser("~/.ssh/known_hosts"))
+      #print "here1"
+      conn.set_missing_host_key_policy(paramiko.RejectPolicy) # default=paranoid
+      #print "here1"
+      conn.connect(hostname=hostname, username=username, password=password,
+                   port=port,
+                  )
+      sftp = conn.open_sftp()
+      self.sftp = sftp
+  
+    def cd(self, path):
+      self.sftp.chdir(path)
+  
+    def getcwd(self):
+      self.sftp.getcwd()
+  
+    def get(self, remotepath, localpath, callback=None):
+      # TODO: progress bar
+      self.sftp.get(remotepath, localpath, callback)
+      # Save the attributes as much as I can do it
+      stats = self.sftp.stat(remotepath)
+      os.utime(localpath, (stats.st_atime, stats.st_mtime))
+      os.chmod(localpath, stats.st_mode)
+
+
+
+# TODO: recode the sftp driver from
+
+class sftp_driver(object):
+  """Python controllable SFTP client built upon OpenSSH's sftp program."""
+  def __init__(self, hostname, username=None, port=22, password=None):
+    raise NotImplementedError
+  # TODO