Limnoria/src/gpg.py
2013-11-02 06:17:51 +00:00

79 lines
2.9 KiB
Python

###
# Copyright (c) 2012, Valentin Lorentz
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
# * Redistributions of source code must retain the above copyright notice,
# this list of conditions, and the following disclaimer.
# * Redistributions in binary form must reproduce the above copyright notice,
# this list of conditions, and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
# * Neither the name of the author of this software nor the name of
# contributors to this software may be used to endorse or promote products
# derived from this software without specific prior written consent.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
###
import os
import supybot.log as log
import supybot.conf as conf
import supybot.world as world
try:
import gnupg
except ImportError:
# As we do not want Supybot to depend on GnuPG, we will use it only if
# it is available. Otherwise, we just don't allow user auth through GPG.
log.debug('Cannot import gnupg, using fallback.')
gnupg = None
try:
if gnupg:
gnupg.GPG(gnupghome=None)
except TypeError:
# This is the 'gnupg' library, not 'python-gnupg'.
gnupg = None
available = (gnupg is not None)
def fallback(default_return=None):
"""Decorator.
Does nothing if gnupg is loaded. Otherwise, returns the supplied
default value."""
def decorator(f):
if available:
def newf(*args, **kwargs):
return f(*args, **kwargs)
else:
def newf(*args, **kwargs):
return default_return
return newf
return decorator
@fallback()
def loadKeyring():
global keyring
path = os.path.abspath(conf.supybot.directories.data.dirize('GPGkeyring'))
if not os.path.isdir(path):
log.info('Creating directory %s' % path)
os.mkdir(path, 0700)
assert os.path.isdir(path)
keyring = gnupg.GPG(gnupghome=path)
loadKeyring()
# Reload the keyring if path changed
conf.supybot.directories.data.addCallback(loadKeyring)