# Copyright (C) 2004 Igor Belyi <belyi@users.sourceforge.net>

# Copyright (C) 2002 John Goerzen <jgoerzen@complete.org>

#

#    This library is free software; you can redistribute it and/or

#    modify it under the terms of the GNU Lesser General Public

#    License as published by the Free Software Foundation; either

#    version 2.1 of the License, or (at your option) any later version.

#

#    This library is distributed in the hope that it will be useful,

#    but WITHOUT ANY WARRANTY; without even the implied warranty of

#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

#    Lesser General Public License for more details.

#

#    You should have received a copy of the GNU Lesser General Public

#    License along with this library; if not, write to the Free Software

#    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307  USA

from __future__ import absolute_import, print_function, unicode_literals

del absolute_import, print_function, unicode_literals

from getpass import getpass

def passphrase_stdin(hint, desc, prev_bad, hook=None):

    """This is a sample callback that will read a passphrase from

    the terminal.  The hook here, if present, will be used to describe

    why the passphrase is needed."""

    why = ''

    if hook != None:

        why = ' ' + hook

    if prev_bad:

        why += ' (again)'

    print("Please supply %s' password%s:" % (hint, why))

    return getpass()

def progress_stdout(what, type, current, total, hook=None):

    print("PROGRESS UPDATE: what = %s, type = %d, current = %d, total = %d" %\

          (what, type, current, total))

def readcb_fh(count, hook):

    """A callback for data.  hook should be a Python file-like object."""

    if count:

        # Should return '' on EOF

        return hook.read(count)

    else:

        # Wants to rewind.

        if not hasattr(hook, 'seek'):

            return None

        hook.seek(0, 0)

        return None