X-Git-Url: http://gitweb.pimeys.fr/?a=blobdiff_plain;f=clearmime.py;fp=clearmime.py;h=d53c7d5215de0454cad30dd7b8aa7e901c1f6c87;hb=01914e99d2c6dfffe01c5f3c6cc5c3fdf145187e;hp=0000000000000000000000000000000000000000;hpb=850c2ba028605fbd9e3faab6b092c62af879ee6b;p=scripts-20-100.git
diff --git a/clearmime.py b/clearmime.py
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+++ b/clearmime.py
@@ -0,0 +1,69 @@
+#!/usr/bin/python
+
+# Copyright 2008 Lenny Domnitser
+#
+# 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 .
+
+__all__ = 'clarify',
+__author__ = 'Lenny Domnitser'
+__version__ = '0.1'
+
+import email
+import re
+
+TEMPLATE = '''-----BEGIN PGP SIGNED MESSAGE-----
+Hash: %(hashname)s
+NotDashEscaped: You need GnuPG to verify this message
+
+%(text)s%(sig)s'''
+
+
+def _clarify(message, messagetext):
+ if message.get_content_type() == 'multipart/signed':
+ if message.get_param('protocol') == 'application/pgp-signature':
+ hashname = message.get_param('micalg').upper()
+ assert hashname.startswith('PGP-')
+ hashname = hashname.replace('PGP-', '', 1)
+ textmess, sigmess = message.get_payload()
+ assert sigmess.get_content_type() == 'application/pgp-signature'
+ #text = textmess.as_string() - not byte-for-byte accurate
+ text = messagetext.split('\n--%s\n' % message.get_boundary(), 2)[1]
+ sig = sigmess.get_payload()
+ assert isinstance(sig, str)
+ # Setting content-type to application/octet instead of text/plain
+ # to maintain CRLF endings. Using replace_header instead of
+ # set_type because replace_header clears parameters.
+ message.replace_header('Content-Type', 'application/octet')
+ clearsign = TEMPLATE % locals()
+ clearsign = clearsign.replace(
+ '\r\n', '\n').replace('\r', '\n').replace('\n', '\r\n')
+ message.set_payload(clearsign)
+ elif message.is_multipart():
+ for message in message.get_payload():
+ _clarify(message, messagetext)
+
+
+def clarify(messagetext):
+ '''given a string containing a MIME message, returns a string
+ where PGP/MIME messages are replaced with clearsigned messages.'''
+
+ message = email.message_from_string(messagetext)
+ _clarify(message, messagetext)
+ return message.as_string()
+
+
+if __name__ == '__main__':
+ import sys
+ sys.stdout.write(clarify(sys.stdin.read()))
+