python: Wrap file-like objects on demand.

* lang/python/gpgme.i (gpgme_data_t): Use new function to create
wrapper objects if necessary, and deallocate them after the function
call.
* lang/python/helpers.c (object_to_gpgme_data_t): New function.
* lang/python/helpers.h (object_to_gpgme_data_t): New prototype.
* lang/python/tests/Makefile.am (pytests): Add new test.
* lang/python/tests/t-idiomatic.py: New file.

Signed-off-by: Justus Winter <[email protected]>

1 files changed, 47 insertions, 0 deletions

diff --git a/lang/python/tests/t-idiomatic.py b/lang/python/tests/t-idiomatic.py
new file mode 100755
index 00000000..05a377e4
--- /dev/null
+++ b/lang/python/tests/t-idiomatic.py
@@ -0,0 +1,47 @@
+#!/usr/bin/env python3
+
+# 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/>.
+
+import os
+import tempfile
+from pyme import core, constants, errors
+import support
+
+support.init_gpgme(constants.PROTOCOL_OpenPGP)
+c = core.Context()
+
+# 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)
+
+    c.op_sign(source, signed, 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 == 0
+    assert errors.GPGMEError(sig.status).getcode() == errors.NO_ERROR
+
+    sink.seek(0, os.SEEK_SET)
+    assert sink.read() == b"Hallo Leute\n"