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# Copyright (C) 2017 Jan Jancar
#
# This file is a part of the Mailman PGP plugin.
#
# 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 3 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, see <http://www.gnu.org/licenses/>.
"""Various pgp and email utilities."""
def copy_headers(from_msg, to_msg, overwrite=False):
"""
Copy the headers and unixfrom from a message to another one.
:param from_msg: The source `Message`.
:type from_msg: email.message.Message
:param to_msg: The destination `Message`.
:type to_msg: email.message.Message
"""
for key, value in from_msg.items():
if overwrite:
del to_msg[key]
if key not in to_msg:
to_msg[key] = value
if to_msg.get_unixfrom() is None:
to_msg.set_unixfrom(from_msg.get_unixfrom())
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