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# Copyright (C) 2017 Jan Jancar
#
# This file is a part of the Mailman PGP plugin.
#
# This program is free software; you can redistribute it and/or modify it under
# the terms of the GNU General Public License as published by the Free
# Software Foundation, either version 3 of the License, or (at your option)
# any later version.
#
# This program 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 General Public License for
# more details.
#
# You should have received a copy of the GNU General Public License along with
# this program. If not, see <http://www.gnu.org/licenses/>.
"""Filesystem stored PGP key."""
from os import remove, urandom
from os.path import getmtime, getsize, join
from pathlib import Path
from public import public
from mailman_pgp.utils.file import locked_obj
from mailman_pgp.utils.pgp import key_from_file
@public
class FSKey:
"""Filesystem stored PGP key."""
def __init__(self, keydir, keyfile, load=False):
self._key = None
self._mtime = None
if isinstance(keydir, Path):
self.keydir = str(keydir)
else:
self.keydir = keydir
self.keyfile = keyfile
if load:
self.load()
@property
def key(self):
"""
:rtype: pgpy.PGPKey
"""
return self._key
@key.setter
def key(self, value):
"""
:param value:
:type value: pgpy.PGPKey
"""
self._key = value
@property
def key_path(self):
return join(self.keydir, self.keyfile)
@property
def lock_path(self):
return self.key_path + '.lock'
def _load(self):
try:
self.key = key_from_file(self.key_path)
self._mtime = getmtime(self.key_path)
except FileNotFoundError:
self.key = None
self._mtime = None
@locked_obj('lock_path')
def load(self):
self._load()
@locked_obj('lock_path')
def reload(self):
if self.key is None:
self._load()
else:
mtime = getmtime(self.key_path)
if self._mtime is None or mtime > self._mtime:
self._load()
@locked_obj('lock_path')
def save(self):
if self.key is None:
remove(self.key_path)
self._mtime = None
else:
with open(self.key_path, 'w') as key_file:
key_file.write(str(self.key))
self._mtime = getmtime(self.key_path)
@locked_obj('lock_path')
def delete(self):
try:
remove(self.key_path)
except FileNotFoundError:
pass
@locked_obj('lock_path')
def shred(self):
try:
size = getsize(self.key_path)
for _ in range(50):
with open(self.key_path, 'wb') as f:
data = urandom(size)
f.write(data)
remove(self.key_path)
except FileNotFoundError:
pass
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