def _encode_multipart(vars, content_type):
 f = StringIO()
 w = f.write
 CRLF = '\r\n'
 boundary = _get_multipart_boundary(content_type)
 if (not boundary):
  boundary = os.urandom(10).encode('hex')
  content_type += ('; boundary=%s' % boundary)
 for (name, value) in vars:
  w(('--%s' % boundary))
  w(CRLF)
  assert (name is not None), ('Value associated with no name: %r' % value)
  w(('Content-Disposition: form-data; name="%s"' % name))
  filename = None
  if getattr(value, 'filename', None):
   filename = value.filename
  elif isinstance(value, (list, tuple)):
   (filename, value) = value
   if hasattr(value, 'read'):
    value = value.read()
  if (filename is not None):
   w(('; filename="%s"' % filename))
  w(CRLF)
  if getattr(value, 'type', None):
   w(('Content-type: %s' % value.type))
   if value.type_options:
    for (ct_name, ct_value) in sorted(value.type_options.items()):
     w(('; %s="%s"' % (ct_name, ct_value)))
   w(CRLF)
  w(CRLF)
  if hasattr(value, 'value'):
   w(value.value)
  else:
   w(value)
  w(CRLF)
 w(('--%s--' % boundary))
 return (content_type, f.getvalue())

def _encode_multipart ( vars , content_type ) : f = StringIO ( ) w = f . write CRLF = '\r\n' boundary = _get_multipart_boundary ( content_type ) if ( not boundary ) : boundary = os . urandom ( 10 ) . encode ( 'hex' ) content_type += ( '; boundary=%s' % boundary ) for ( name , value ) in vars : w ( ( '--%s' % boundary ) ) w ( CRLF ) assert ( name is not None ) , ( 'Value associated with no name: %r' % value ) w ( ( 'Content-Disposition: form-data; name="%s"' % name ) ) filename = None if getattr ( value , 'filename' , None ) : filename = value . filename elif isinstance ( value , ( list , tuple ) ) : ( filename , value ) = value if hasattr ( value , 'read' ) : value = value . read ( ) if ( filename is not None ) : w ( ( '; filename="%s"' % filename ) ) w ( CRLF ) if getattr ( value , 'type' , None ) : w ( ( 'Content-type: %s' % value . type ) ) if value . type_options : for ( ct_name , ct_value ) in sorted ( value . type_options . items ( ) ) : w ( ( '; %s="%s"' % ( ct_name , ct_value ) ) ) w ( CRLF ) w ( CRLF ) if hasattr ( value , 'value' ) : w ( value . value ) else : w ( value ) w ( CRLF ) w ( ( '--%s--' % boundary ) ) return ( content_type , f . getvalue ( ) )
build a multipart/form-data body with randomly generated boundary .