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# filters.py - conversion filters for compression and encryption
#
# Copyright (C) 2015 Arthur de Jong
#
# 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 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
#
# The files produced as output from the software do not automatically fall
# under the copyright of the software, unless explicitly stated otherwise.
import os
import subprocess
class Reader(object):
def __init__(self, cmd, fileobj):
self.cmdline = ' '.join(cmd)
self.fileobj = fileobj
self.proc = subprocess.Popen(
cmd, universal_newlines=False, stdin=fileobj,
stdout=subprocess.PIPE, stderr=subprocess.PIPE)
def close(self):
# complete command
(stdout, stderr) = self.proc.communicate(None)
self.fileobj.close()
# FIXME: check stderr
if self.proc.returncode:
print(stderr)
raise EnvironmentError('%s failed' % self.cmdline)
def __getattr__(self, attr):
return getattr(self.proc.stdout, attr)
def __iter__(self):
return self.proc.stdout.__iter__()
def __enter__(self):
return self
def __exit__(self, type, value, traceback):
self.close()
class Writer(object):
def __init__(self, cmd, fileobj):
self.cmdline = ' '.join(cmd)
self.fileobj = fileobj
self.proc = subprocess.Popen(
cmd, universal_newlines=False, stdin=subprocess.PIPE,
stdout=fileobj, stderr=subprocess.PIPE)
def close(self):
# complete command
(stdout, stderr) = self.proc.communicate(None)
self.fileobj.close()
# FIXME: check stderr
if self.proc.returncode:
print(stderr)
raise EnvironmentError('%s failed' % self.cmdline)
def __getattr__(self, attr):
return getattr(self.proc.stdin, attr)
def __enter__(self):
return self
def __exit__(self, type, value, traceback):
self.close()
class Filter(object):
extension = ''
def rename(self, fname):
if self.extension:
return '%s.%s' % (fname, self.extension)
return fname
class GzipCompression(Filter):
extension = 'gz'
restore_cmd = 'gzip -dc'
def reader(self, fileobj):
return Reader(['gzip', '-dc'], fileobj)
def writer(self, fileobj):
return Writer(['gzip', '-c', '-n', '-9'], fileobj)
class Bzip2Compression(Filter):
extension = 'bz2'
restore_cmd = 'bzip2 -dc'
def reader(self, fileobj):
return Reader(['bzip2', '-dc'], fileobj)
def writer(self, fileobj):
return Writer(['bzip2', '-c', '-9'], fileobj)
class XZCompression(Filter):
extension = 'xz'
restore_cmd = 'xz -dc'
def reader(self, fileobj):
return Reader(['xz', '-dc'], fileobj)
def writer(self, fileobj):
return Writer(['xz', '-zc'], fileobj)
class NoEncryption(Filter):
restore_cmd = 'cat'
def reader(self, fileobj):
return fileobj
def writer(self, fileobj):
return fileobj
class GnuPGEncryption(Filter):
extension = 'gpg'
restore_cmd = 'gpg -q --batch --no-use-agent ' + \
'--passphrase-file "$EXTMPDIR"/passphrase -d'
def __init__(self, repo):
self.repo = repo
def reader(self, fileobj):
infd, outfd = os.pipe()
os.write(outfd, self.repo.get_passphrase() + '\n')
os.close(outfd)
f = Reader([
'gpg', '--batch', '--no-use-agent', '-q',
'--passphrase-fd', str(infd), '--no-textmode', '-d'],
fileobj)
os.close(infd)
return f
def writer(self, fileobj):
infd, outfd = os.pipe()
os.write(outfd, (self.repo.get_passphrase() + '\n').encode('ascii'))
os.close(outfd)
f = Writer([
'gpg', '--batch', '--symmetric', '--cipher-algo', 'AES256', '-q',
'--compress-algo', 'none', '--passphrase-fd', str(infd),
'--no-textmode'],
fileobj)
os.close(infd)
return f
class GnuPGKeyEncryption(Filter):
extension = 'gpg'
restore_cmd = 'gpg -d'
def __init__(self, keys=()):
self.keys = keys
def reader(self, fileobj):
return Reader(['gpg', '-d', '-q'], fileobj)
def writer(self, fileobj):
args = ['gpg', '--batch', '-q', '--encrypt', '--trust-model', 'always']
for key in self.keys:
args.extend(['--recipient', key])
return Writer(args, fileobj)
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