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t-idiomatic.py
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t-idiomatic.py
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#!/usr/bin/env python
# Copyright (C) 2016 g10 Code GmbH
#
# This file is part of GPGME.
#
# GPGME 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.
#
# GPGME 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 program; if not, see <http://www.gnu.org/licenses/>.
from __future__ import absolute_import, print_function, unicode_literals
del absolute_import, print_function, unicode_literals
import sys
import io
import os
import tempfile
import gpg
import support
_ = support # to appease pyflakes.
# Both Context and Data can be used as context manager:
with gpg.Context() as c, gpg.Data() as d:
c.get_engine_info()
d.write(b"Halloechen")
leak_c = c
leak_d = d
assert leak_c.wrapped == None
assert leak_d.wrapped == None
def sign_and_verify(source, signed, sink):
with gpg.Context() as c:
c.op_sign(source, signed, gpg.constants.sig.mode.NORMAL)
signed.seek(0, os.SEEK_SET)
c.op_verify(signed, None, sink)
result = c.op_verify_result()
assert len(result.signatures) == 1, "Unexpected number of signatures"
sig = result.signatures[0]
assert sig.summary == (gpg.constants.sigsum.VALID |
gpg.constants.sigsum.GREEN)
assert gpg.errors.GPGMEError(sig.status).getcode() == gpg.errors.NO_ERROR
sink.seek(0, os.SEEK_SET)
assert sink.read() == b"Hallo Leute\n"
# Demonstrate automatic wrapping of file-like objects with 'fileno'
# method.
with tempfile.TemporaryFile() as source, \
tempfile.TemporaryFile() as signed, \
tempfile.TemporaryFile() as sink:
source.write(b"Hallo Leute\n")
source.seek(0, os.SEEK_SET)
sign_and_verify(source, signed, sink)
if sys.version_info[0] == 3:
# Python2's io.BytesIO does not implement the buffer interface,
# hence we cannot use it as sink.
# XXX: Python's io.BytesIo.truncate does not work as advertised.
# http://bugs.python.org/issue27261
bio = io.BytesIO()
bio.truncate(1)
if len(bio.getvalue()) != 1:
# This version of Python is affected, preallocate buffer.
preallocate = 128*b'\x00'
else:
preallocate = b''
# Demonstrate automatic wrapping of objects implementing the buffer
# interface, and the use of data objects with the 'with' statement.
with io.BytesIO(preallocate) as signed, gpg.Data() as sink:
sign_and_verify(b"Hallo Leute\n", signed, sink)

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