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# util.py - utility functions for command-line scripts
#
# Copyright (C) 2014-2018 Arthur de Jong
#
# 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., 51 Franklin Street, Fifth Floor, Boston, MA
# 02110-1301 USA
"""Utility functions for command-line scripts."""
import argparse
import os.path
import sys
from binascii import a2b_hex
import pskc
version_string = '''
%s (python-pskc) %s
Written by Arthur de Jong.
Copyright (C) 2014-2018 Arthur de Jong
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
'''.lstrip()
class VersionAction(argparse.Action):
"""Define --version argparse action."""
def __init__(self, option_strings, dest,
help='output version information and exit'):
super(VersionAction, self).__init__(
option_strings=option_strings,
dest=argparse.SUPPRESS,
default=argparse.SUPPRESS,
nargs=0,
help=help)
def __call__(self, parser, namespace, values, option_string=None):
"""Output version information and exit."""
sys.stdout.write(version_string % (parser.prog, pskc.__version__))
parser.exit()
def get_key(argument):
"""Get the key from a file or a hex-encoded string."""
if os.path.isfile(argument):
with open(argument, 'rb') as keyfile:
return keyfile.read()
else:
return a2b_hex(argument)
def get_password(argument):
"""Get the password from a file or as a string."""
if os.path.isfile(argument):
with open(argument, 'r') as passfile:
return passfile.read().replace('\n', '')
else:
return argument
class OutputFile(object):
"""Wrapper around output file to also fall back to stdout."""
def __init__(self, output):
self.output = output
def __enter__(self):
self.file = open(self.output, 'w') if self.output else sys.stdout
return self.file
def __exit__(self, *args):
if self.output:
self.file.close()
else: # we are using stdout
self.file.flush()
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