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# GPGSigVerifier -*- mode: python; coding: utf-8 -*-
# A class for verifying signed files
# Copyright (c) 2002 Colin Walters <walters@gnu.org>
# This file 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 2 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, write to the Free Software
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
import os, subprocess
class GPGSigVerifierException(Exception):
def __init__(self, value):
self._value = value
def __str__(self):
return repr(self._value)
class GPGSigVerificationFailure(Exception):
def __init__(self, value, output):
self._value = value
self._output = output
def __str__(self):
return repr(self._value)
def getOutput(self):
return self._output
class GPGSigVerifier:
def __init__(self, keyrings, gpgv=None):
self._keyrings = keyrings
if not gpgv:
gpgv = '/usr/bin/gpgv'
if not os.access(gpgv, os.X_OK):
raise GPGSigVerifierException("Couldn't execute \"%s\"" % gpgv)
self._gpgv = gpgv
def verify(self, filename, sigfilename=None):
cmdline = [self._gpgv]
for keyring in self._keyrings:
cmdline.extend(['--keyring', keyring])
if sigfilename:
cmdline.append(sigfilename)
cmdline.append(filename)
try:
return subprocess.check_output(cmdline).decode('utf-8')
except subprocess.CalledProcessError as e:
if e.returncode > 0:
msg = "gpgv exited with error code %d" % e.returncode
else:
msg = "gpgv died with signal %d" % -e.returncode
raise GPGSigVerificationFailure(msg, e.output)
# vim:ts=4:sw=4:et:
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