1 files changed, 35 insertions, 0 deletions

diff --git a/src/mailman_pgp/utils/email.py b/src/mailman_pgp/utils/email.py
new file mode 100644
index 0000000..4d08d8a
--- /dev/null
+++ b/src/mailman_pgp/utils/email.py
@@ -0,0 +1,35 @@
+# 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/>.
+
+""""""
+
+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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